CN1859558A - Digital TV telecast system and its method based on radio transmission - Google Patents

Abstract

The invention discloses a digital TV broadcasting system based on wireless transmission, which includes a user side and a network side, and the user side includes a wireless communication terminal, which sends the interactive data stream of the user participating in digital TV broadcast programs to the network side through wireless transmission, and receives and play the digital TV broadcast program superimposed with the interactive data stream issued by the network side; the network side includes an interactive processing device, which processes the interactive data stream sent by the wireless communication terminal into a digital TV broadcast program data stream that can be broadcast on the network side. The superimposed data format; the data superimposing device, which performs data superimposition on the interactive data stream processed by the interactive processing device and the digital TV broadcast program data stream broadcast on the network side; the broadcast delivery device, encodes the data stream superimposed by the data superimposing device After modulation, it is sent to wireless communication terminals through a broadcast channel. The invention enables the wireless transmission-based digital television system to realize the interaction between users and broadcasting programs.

Description

Digital TV broadcasting system and method based on wireless transmission

technical field

The invention relates to the technical field of digital TV broadcasting services, in particular to a wireless transmission-based digital TV broadcasting system and a method thereof.

Background technique

The implementation of digital TV broadcasting is generally to distribute digital TV broadcast programs through broadcast channels, and provide interactive channels for users to communicate with digital TV broadcast servers. The current forms of digital TV broadcasting services mainly include digital TV, Internet TV and mobile TV, among which the main difference between digital TV broadcasting service and traditional analog TV service is that digital TV broadcasting service can realize on-demand service and digital TV broadcasting server interaction with users. The greatest effect of digital TV broadcasting services in realizing interactive communication is that users can order programs, or users actively download information from digital TV broadcasting servers.

With the continuous improvement of mobile communication technology, especially the introduction of the third-generation and next-generation mobile communication technology standards, the communication transmission bandwidth that the mobile communication system can support is gradually increasing. For example, the third-generation mobile communication system has been able to transmit Dynamic graphics, animation, or support for watching online film and television programs, etc. In view of the continuous development of mobile communication technology, it has been proposed to combine the digital TV broadcasting system with the mobile communication system. By upgrading and expanding the user terminal, mobile users can watch the digital TV broadcasting system through their own mobile terminal equipment. Broadcast and TV programs distributed, such as the mobile TV technology that is currently being developed in the industry.

However, during the development of digital TV broadcasting services based on mobile communication systems, there is no relevant technology to describe that when users watch digital TV broadcasting programs issued by the digital TV broadcasting system, users can pass their current scene information through terminal equipment. The transmission channel of the mobile communication system is uploaded to the digital TV broadcast server, so as to participate in live broadcast TV programs. It can be seen that in the digital TV broadcasting service based on the mobile communication system, relevant users participate in live broadcast TV programs through the transmission channel of the mobile communication system as the transmission channel of participation data, so that the relevant technologies for realizing live program interaction are not perfect enough. Therefore, it is necessary to further expand the existing digital TV broadcasting service technology based on the mobile communication system, so that the mobile digital TV broadcasting service can support users to interact with live programs on the side of the digital TV broadcasting system.

Contents of the invention

The technical problem to be solved by the present invention is to provide a digital TV broadcasting system based on wireless transmission and its method, so that the digital TV broadcasting system based on wireless line transmission can realize the interaction between users and digital TV broadcasting programs being broadcast.

In order to solve the above problems, the technical scheme proposed by the present invention is as follows:

A digital television broadcasting system based on wireless transmission, comprising a user side and a network side, the user side comprising:

The wireless communication terminal is used to send the interactive data stream of the user's participation in the digital TV broadcast program to the network side through the wireless transmission channel, and is used to receive and play the digital TV broadcast program sent by the network side and superimposed with the interactive data stream of the user's participation;

The network side includes:

The interactive processing device is used to process the interactive data stream sent by the wireless communication terminal through the wireless transmission channel into a data format that can be superimposed with the digital TV broadcast program data stream broadcast on the network side;

A data superimposition device, configured to perform data superposition processing on the interactive data stream processed by the interactive processing device and the digital TV broadcast program data stream broadcast on the network side;

The broadcast delivery device is used to send the data stream superimposed by the data superposition device to the wireless communication terminal through a broadcast channel after encoding and modulation processing.

Preferably, the wireless communication terminal specifically includes:

The data collection unit is used to collect multimedia data of the user's environment as an interactive data stream when the user participates in a digital TV broadcast program;

The data sending unit is used to encode and modulate the interactive data stream collected by the data collecting unit, and send it to the network side through the wireless transmission channel;

The data receiving unit is used to receive the digital TV broadcast program sent by the network side and superimposed with the interactive data stream participated by the user;

The program playing unit is used to demodulate and decode the digital TV broadcast program data stream received by the data receiving unit and superimposed with the interactive data stream participated in by the user, and then play it for the user to watch.

Preferably, the wireless communication terminal is:

A mobile phone terminal with a multimedia information collection component; or

Personal digital assistant terminals with multimedia information collection components; or

A combined device that combines a digital television receiver with a terminal capable of wireless broadband communication.

Preferably, the interactive processing device specifically includes:

The interactive control unit is used to notify the user of the start message and termination message of the interactive link that the user can participate in the digital TV broadcast program, and to monitor the interactive process; at the same time, it is also used to broadcast according to the attributes of the digital TV broadcast program data stream broadcast by the network side. Parameters define a set of control parameters for transforming the Interactive Data Stream;

The data conversion processing unit is used to convert and process the interactive data stream sent by the wireless communication terminal through the wireless transmission channel into a digital TV broadcast program data stream that can be broadcast with the network side according to a set of control parameters determined by the interactive control unit Data format for overlay.

Preferably, the interaction control unit notifies the user of the start message and termination message of the interactive session by sending a data message to the wireless communication terminal.

Preferably, the interaction control unit notifies the user of the start message and termination message of the interactive session by inserting subtitle messages into the data stream of the digital TV broadcast broadcast delivered by the network side.

Preferably, the interactive processing device further includes a data identification unit, which is used to identify the interactive data stream of the user participating in the digital TV broadcast program from the data sent by the wireless communication terminal through the wireless transmission channel, and send it to the data converter The processing unit performs conversion processing.

Preferably, the interaction processing device further includes a first data buffer unit, configured to perform buffer processing on the interaction data stream sent by the wireless communication terminal through the wireless transmission channel, and the data conversion processing unit retrieves from the first data buffer The interactive data stream is extracted from the unit for conversion processing.

Preferably, the interaction processing device further includes a participating user queuing unit, configured to perform queuing processing for participating users who send requests to participate in the interaction according to a specified policy, and the interaction control unit sequentially selects according to the queuing results of the participating user queuing unit Each participating user, and send the start message of the interactive session to the selected participating users.

Preferably, the participating user queuing unit sequentially queues each participating user according to the priority order of each participating user.

Preferably, the participating user queuing unit performs queuing processing for each participating user sequentially according to the sequence in which each participating user sends a request message for participating in the interaction.

Preferably, the interaction processing device further includes a display unit for displaying user-related information of each participating user.

Preferably, the data superposition device specifically includes:

a second data cache unit, configured to cache the interactive data stream processed by the interactive processing device;

The data superposition processing unit is configured to extract the cached interactive data stream from the second data cache unit, and perform superposition processing with the digital TV broadcast program data stream provided by the content server on the network side.

Preferably, the broadcast delivery device specifically includes:

An encoding and modulation unit, configured to perform encoding and modulation processing on the data stream superimposed by the data superposition device;

A broadcast distribution unit, configured to distribute the digital TV broadcast program superimposed with user-participated interactive data streams processed by the coding and modulation unit to each broadcast transmitter, and each broadcast transmitter will superimpose user-participated interactive data streams Streaming digital TV broadcast programs are sent to the wireless communication terminal through a broadcast channel.

Preferably, the interactive processing device, the data superimposing device and the broadcast sending device are simultaneously placed in the digital TV broadcast server on the network side.

Preferably, the data superimposition device and the broadcast sending device are placed in the digital TV broadcast server at the network side, and the interactive processing device is placed in other peripheral equipment of the digital TV broadcast server.

Preferably, the wireless communication terminal sends the interactive data stream of the user's participation in the digital TV broadcast program to the network side through the transmission channel of the mobile communication system.

Preferably, the broadcast sending device codes and modulates the data stream superimposed by the data superimposition device, and sends it to the wireless communication terminal through the broadcast channel of the mobile communication system.

Preferably, the broadcast sending device codes and modulates the data stream superimposed by the data superimposing device, and sends it to the wireless communication terminal through the broadcast channel of the wireless digital broadcast television network.

A digital television broadcasting method based on wireless transmission, comprising steps:

The user side sends the interactive data stream of the digital TV broadcast program participating in the network side broadcast to the network side through the wireless transmission channel;

The network side processes the interactive data stream sent by the user side through the wireless transmission channel into a data format that can be superimposed with the digital TV broadcast program data stream broadcast by the network side; and

Perform data superposition processing on the processed interactive data stream and the digital TV broadcast program data stream broadcast on the network side;

After the network side encodes and modulates the superimposed data stream, it sends it to the user side through the broadcast channel for playback.

Preferably, the method further includes the network side sending a data message to the user side to notify the user side that it can participate in the digital TV broadcast program being broadcast by the network side.

Preferably, the method further includes the network side inserting a subtitle message in the broadcast digital TV broadcast program data stream to notify users that they can participate in the digital TV broadcast program being broadcast by the network side.

Preferably, the wireless transmission channel is a transmission channel in a mobile communication system.

Preferably, the process of the network side processing the interactive data stream sent from the user side specifically includes:

The network side determines a set of control parameters for converting the interactive data stream according to the attribute parameters of the broadcast digital TV broadcast program data stream; and

According to the set of determined control parameters, the interactive data stream sent by the user side through the wireless transmission channel is converted and processed into a data format that can be superimposed with the digital TV broadcast program data stream broadcast by the network side.

Preferably, the network side superimposes the processed interactive data stream and the digital TV broadcast program data stream broadcast by the network side into a form of picture-in-picture.

Preferably, the network side broadcasts the coded and modulated superimposed data streams to each base station transmitter; the respective base station transmitters send the superimposed data streams to the user side through a broadcast channel in the mobile communication system for playback.

Preferably, the network side broadcasts the coded and modulated superimposed data streams to each digital TV broadcast transmitter; the respective digital TV broadcast transmitters send the superimposed data streams to Play on the user side.

The beneficial effect that the present invention can reach is as follows:

The technical solution of the present invention introduces the interactive processing link for users to participate in digital TV broadcast programs through wireless transmission between the digital TV broadcast system side and the user side, so that the digital TV broadcast system based on wireless line transmission can realize the user and the broadcasting program. Interaction between digital TV broadcast programs, thereby enriching the diversity of digital TV broadcast services based on wireless transmission line transmission signals.

Description of drawings

Fig. 1 is a schematic diagram of the overall system frame structure of the digital television broadcasting system based on wireless transmission in the present invention;

Fig. 2 is the concrete structural block diagram of wireless communication terminal in the system of the present invention;

Fig. 3 is the specific structural block diagram of the interactive processing device in the system of the present invention;

Fig. 4 is the specific structural block diagram of the data superposition device in the system of the present invention;

Fig. 5 is a specific structural block diagram of the broadcast delivery device in the system of the present invention;

6 is a schematic diagram of the specific composition and structure of the digital television broadcast server when the data superimposition device and the broadcast delivery device are placed in the digital television broadcast server on the network side in the system of the present invention;

7 is a schematic diagram of data transmission between the digital TV broadcast server and the interactive processing device in the system of the present invention;

Fig. 8 is a schematic diagram of the first typical composition structure of the system of the present invention;

Fig. 9 is a schematic diagram of the second typical composition structure of the system of the present invention;

Fig. 10 is a schematic diagram of the specific composition and structure of the digital TV broadcast server when the data superimposition device, the broadcast delivery device and the interactive processing device are placed in the digital TV broadcast server on the network side in the system of the present invention;

Fig. 11 is a flow chart of the main realization principle of the digital television broadcasting method based on wireless transmission in the present invention;

Fig. 12 is a schematic diagram of the processing process initiated by the interactive link in the method of the present invention;

Fig. 13 is a schematic diagram of the specific processing process of the interactive link in the method of the present invention;

Fig. 14 is a schematic diagram of the processing process of the end of the interactive link in the method of the present invention.

Detailed ways

The design core of the technical solution of the present invention is to provide a system and method for information interaction between the user and the network side in the digital TV broadcasting service based on wireless transmission. The terminal captures the interactive scene information of the user participating in the digital TV broadcast program and transmits it to the network side through the wireless communication network (such as the third-generation or next-generation mobile communication network, etc.), and the network side superimposes the interactive information sent by the user on the currently playing In the digital TV broadcast program, it is then broadcast and distributed through the broadcast channel in the wireless communication system or wireless digital TV broadcast system. After receiving the digital TV broadcast program with interactive information superimposed on the user terminal, it can play the interactive picture mixed with participants. content of the program. The application field of the solution of the present invention is the current mobile digital TV broadcasting system, such as mobile phone TV system and the like.

The main realization principles, specific implementation methods and corresponding beneficial effects of the solution of the present invention will be described in detail below in conjunction with each accompanying drawing.

Please refer to Figure 1, which is a schematic diagram of the overall system framework structure of the digital television broadcasting system based on wireless transmission in the present invention. The entire system consists of a user side and a network side, wherein the wireless transmission channel is used as an interactive channel between the user side and the network side Perform information interaction, and broadcast digital TV broadcast program data mixed with user participation data through the wireless broadcast channel.

The user side mainly includes a wireless communication terminal 10, which is used to send the interactive data stream of the user's participation in digital TV broadcast programs to the network side through the wireless transmission channel, and is also used to receive and play the interactive data sent by the network side and superimposed with the user's participation. Streaming digital television broadcast programs;

The network side mainly includes an interactive processing device 20, a data superimposing device 30 and a broadcast sending device 40, wherein:

The interactive processing device 20 is configured to process the interactive data stream sent by the above-mentioned wireless communication terminal 10 through the wireless transmission channel into a data format that can be superimposed with the digital TV broadcast program data stream sent by the network side broadcast;

The data superposition device 30 is used to perform data superposition processing on the interactive data stream processed by the above-mentioned interactive processing device 20 and the digital TV broadcast program data stream delivered by the network side broadcast;

The broadcast sending device 40 is configured to send the data stream superimposed by the data superimposing device 30 to the wireless communication terminal 10 through a broadcast channel after encoding and modulation processing.

Among them, the wireless communication terminal 10 can send the interactive data stream of the user participating in the digital TV broadcast program to the network side through the transmission channel of the mobile communication system. Here, the transmission channel can be defined as an interactive channel, and the main function of the interactive channel is to transmit The user participates in the interactive data of the digital TV broadcasting program, wherein the specific interactive channel can be the uplink and downlink dedicated channels provided in the GSM network, GPRS network or the third-generation mobile communication network UMTS. In FIG. 1, the channel from the wireless communication terminal 10 to the base station transmitter 50, and then through the access network and transmission network to the digital TV broadcast server is the interactive channel defined here.

The above-mentioned broadcast sending device 40 can encode and modulate the data stream after the data superposition processing by the data superposition device 30, and then send it to the wireless communication terminal through the broadcast channel of the mobile communication system; After the stream is coded and modulated, it is sent to the wireless communication terminal through the broadcast channel of the wireless digital broadcasting television network. That is, the broadcast channel can be the downlink broadcast channel in the DVB-H standard formulated by the DVB organization, or the downlink broadcast channel in the multimedia broadcast multicast service (MBMS) formulated in the 3GPP specification, or the broadcast channel specified in the 3GPP2 specification. Downlink Broadcast Channel in Multicast Service (BCMCS). If the DVB-H standard is adopted, the broadcast channel here is the transmission channel between the DVB-H transmitter and the wireless communication terminal in Figure 1, and the digital TV broadcast program data stream reaches the DVB-H transmission from the digital broadcast server through the IP transmission network Behind the tower 50 , the DVB-H transmission tower 50 further transmits the digital TV broadcast program data stream to the wireless communication terminal 10 . If the MBMS or BCMCS standard in the 3G mobile network is adopted, the broadcast channel here is the downlink channel between the wireless access network UTRAN/GERAN and the wireless communication terminal, and the digital TV broadcast program data stream flows from the digital broadcast server to the core network After the base station 50, it is sent to the wireless communication terminal 10 by the base station system of the mobile network. Among them, the DVB-H transmission tower and the base station of the mobile network can use the same transmission tower physically, and can also use different transmission towers respectively.

Please specifically refer to Fig. 2, this figure is the specific structural block diagram of wireless communication terminal in the system of the present invention, and it specifically comprises data acquisition unit 101, data transmission unit 102, data reception unit 103 and program playback unit 104, wherein each constituent unit The specific functions are as follows:

The data collection unit 101 is used to collect multimedia data of the user's environment as an interactive data flow when the user participates in a digital TV broadcast program. For example, the data collection unit 101 can be a camera component on a current mobile terminal, etc.;

The data sending unit 102 is used for encoding and modulating the interactive data stream collected by the above-mentioned data collecting unit 101, and sending it to the network side through a wireless transmission channel;

A data receiving unit 103, configured to receive a digital TV broadcast program delivered by the network side and superimposed with an interactive data stream in which the user participates;

The program playing unit 104 is used to demodulate and decode the digital TV broadcast program data stream received by the data receiving unit 103 and superimposed with the interactive data stream participated by the user, and then play it for the user to watch. For example, the user can watch the participating user's TV picture information displayed in picture-in-picture form between interactive scenes and digital TV broadcast programs.

To sum up, the wireless communication terminal here can be an independent terminal device. In addition to the basic ability to receive digital TV broadcast content and play digital TV broadcast content, the terminal device also has the ability to collect audio and video information, and can The data is sent to the digital TV broadcasting system side through the wireless network, such as a mobile phone terminal or a personal digital assistant terminal (PDA) with a multimedia information collection component commonly used at present. In addition, the wireless communication terminal here can also be a digital TV receiver capable of receiving digital TV broadcast content and playing digital TV broadcast content, and a terminal device capable of taking pictures, recording, and sending data to the digital TV broadcast system side through a wireless network Combination, such as a terminal device composed of a digital TV receiver and a mobile phone terminal with the above corresponding functions, where the digital TV receiver is used to play digital TV broadcast programs, and the mobile phone is used to interact with the system side for interactive data processing.

Wherein the above-mentioned interactive processing device 20 is the core component in the system of the present invention, and it is responsible for the initiation of the interactive link of the user participating in the live program, the control of the interactive process and the end of the interactive link. The uploaded video and audio data streams are processed, so that the data superposition device 30 can superimpose the interactive data streams uploaded by users and the digital TV broadcast program data streams delivered by broadcasting.

Please specifically refer to Fig. 3, this figure is the specific composition structure block diagram of the interactive processing device in the system of the present invention, wherein the interactive processing device 20 mainly includes an interactive control unit 201, a data conversion processing unit 202, a data identification unit 203, a first data cache The unit 204, the participating user queuing unit 205 and the display unit 206 communicate with each other through the control bus. The interaction processing device 20 is mainly responsible for the entire process of the user participating in the interaction, and processes the interactive data stream uploaded by the wireless communication terminal 10 through the wireless interaction channel. The following will further describe the main work flow of the interaction processing device 20 from the perspective of each component unit:

The interactive control unit 201 is used to notify the user of the start message and termination message of the interactive link that the user can participate in the digital TV broadcast program, and to monitor the entire interactive process; at the same time, it is also used to broadcast the digital TV broadcast program data flow according to the network side. attribute parameters to determine a set of control parameters for converting the interactive data stream; wherein the interactive control unit 201 can notify the user of the start message and termination message of the interactive link by sending a data message to the wireless communication terminal 10 , it is also possible to notify the user of the start message and end message of the interactive session by inserting subtitle messages into the digital TV broadcast program data stream broadcast from the network side.

Among them, the interactive control unit 201 is the most important part of the interactive processing device 20, responsible for initiating the interactive session, controlling the interactive process and terminating the interactive session according to the digital TV broadcast content provided by the digital TV broadcast content provider. The interactive control unit 201 can choose to send an interactive invitation message to a certain (some) wireless communication terminal through the interactive channel according to the needs of the digital TV broadcast content; to inform the user that an interaction request can be initiated. In the specific implementation process, the interaction control unit 201 can pre-store some reasonable interaction initiation methods. If the interaction control unit 201 initiates the interaction by sending an invitation message to the wireless communication terminal 10, the interaction control unit 201 can send the invitation. Wait for the confirmation information of the invited user after the short message; if the interactive control unit 201 uses the method of inserting subtitles in the broadcast digital TV program to prompt the user to send an interactive request to the interactive processing device 20, then the interactive control unit 201 can wait for the user to send an interactive processing request to the interactive processing unit 201. The device 20 sends an interaction request message to further select participating users.

After the interactive control unit 201 receives the interactive response confirmation information sent by the user, the interactive link can start. After the interactive link starts, the interactive control unit 201 can obtain the currently playing digital TV broadcast from the content server of the digital TV broadcast server. The attribute parameters of the content audio and video data stream, and determine a group according to these attribute parameters to control the subsequent data conversion processing unit 202 to analyze and process the control parameters of the audio and video data stream sent by the participating users, and use this group of control parameters to control data conversion The processing unit 202 analyzes and processes the audio and video data streams sent by participating users.

If considering the problem that the number of participating users who are required to participate in the currently broadcasting digital TV broadcast program will be relatively large, the interaction processing device 20 may further include a participating user queuing unit 205 for participating in the interaction with sending requests according to a predetermined strategy. The participating users perform queuing processing, and the above-mentioned interaction control unit 201 will then select each participating user in turn according to the queuing result of the participating user queuing unit 205, and send the start message of the interactive link to the selected participating users, wherein the participating users queue up The unit 205 may sequentially queue each participating user according to the priority order of each participating user, or may sequentially queue each participating user according to the sequence in which each participating user sends a request message to participate in the interaction.

That is, the participating user queuing unit 205 will arrange to perform queuing processing on all participating users, so as to wait for the interactive control unit 201 to select a certain participating user (some) based on a certain selection strategy, and send a message to the selected certain participating user (some) The interaction request uses a message to inform the participating user(s) that the interaction session can start, and waits for the participation confirmation information of the participating user(s). The above-mentioned selection strategy can be to select participating users according to their priority order, such as high-priority participating users will be selected first; it can also select participating users according to the time sequence in which participating users send request participation messages, that is, first Participating users who send request messages are preferentially selected, wherein the selection strategy can be preset in the interaction control unit 201, and the selection strategy set on it can be increased or decreased.

For example, the working relationship between the interaction control unit 201 and the participating user queuing unit 205 can be specifically as follows:

The user identification information of each interaction requesting user is stored in the participating user queuing unit 205 , and the queuing process is performed according to the request time sequence of each participating user. That is, when a participating user sends an interactive participation request message, the request message is transmitted to the interactive control unit 201 through the control bus, and at the same time, the user ID that uniquely identifies the participating user is stored in the interactive control unit 201, and is shared with other participating users. The time of sending the request message is queued up successively, wherein the user identification information may be the mobile phone number of the user terminal, or the user account information of the participating user for subscribing to the digital TV broadcasting service. When the interaction control unit 201 selects a participating user in the participating user queue, the interaction control unit 201 sends a short message prompt to the selected participating user through the interactive channel, informing the participating user of the opportunity to participate in the interaction and asking him to confirm his participation in the interaction. middle. After the participating user confirms to participate in the interaction, the participating user terminal sends the confirmation information to the interaction control unit 201 through the interaction channel, and the interaction control unit 201 determines that the interaction officially starts after receiving the confirmation signal.

When the participating user exits, the interaction control unit 201 determines that the interaction is over. When the interaction control unit 201 detects that the participating user has withdrawn from the interaction, it deletes the user identification information of the participating user stored in the participating user queuing unit 205, and simultaneously sends a corresponding signal to notify the follow-up The data conversion processing unit 202 and the data superposition device 30 stop the corresponding processing work.

The data identification unit 203 is mainly used to identify the interactive data stream of the user participating in the digital TV broadcast program in the data sent by the wireless communication terminal through the wireless transmission channel, and send the identified interactive data stream to the subsequent data conversion processing unit 202 performs conversion processing. Since the interaction processing device 20 is in the interactive channel, it is only necessary for the interactive processing device 20 to transparently transmit some interactive data streams not sent by the user, without any processing by the interactive processing device 20. Therefore, the interactive processing device 20 is required to be able to Analyze the upstream data flow of the uploaded data flow, and judge whether the uploaded data flow is the data flow uploaded by the participating users who are interacting according to the user identification of the uploaded data flow. , it is further forwarded to the subsequent data conversion processing unit 202. If the uploaded data is known to be just other common upstream data streams after analysis and processing by the data identification unit 203, the interactive processing device 20 does not perform any processing on the uploaded data stream. Pass through directly.

The first data cache unit 204 is mainly used to cache the interactive data stream sent by the wireless communication terminal through the wireless transmission channel, and the subsequent data conversion processing unit 202 will sequentially extract its cached data from the first data cache unit 204 The interactive data stream is transformed and processed. The subsequent data conversion processing unit 202 needs to extract the cached interactive data stream from the first data cache unit 204 for processing. After the data conversion processing unit 202 processes a part of the interactive data stream, the first data cache unit 204 will release a part of the interactive data stream. storage space, the interaction data stream cached in the first data cache unit 204 is continuously updated until the interaction is terminated. The setting of the first data cache unit 204 is mainly to avoid the picture stop or frame skipping of the participating users caused by the change of the data transmission rate caused by the unstable network transmission resources. It should be noted here that: the above-mentioned participating user queuing unit 205 and the first data cache unit 204 here may be physically located in different storage areas in the same memory.

The data conversion processing unit 202 is mainly used to convert and process the interactive data stream sent by the wireless communication terminal through the wireless transmission channel into digital TV broadcast program data that can be broadcast with the network side according to a set of control parameters determined by the above-mentioned interactive control unit 201 The data format in which streams are overlaid. Due to the different types of each wireless communication terminal, there may be differences in the resolution of the interactive audio and video data streams sent by each wireless communication terminal, the frame rate of the video, and the color parameters that can be supported. The data conversion processing unit 202 It is responsible for processing the audio and video interactive data stream sent by the participating users into the required data format, and then sending it to the subsequent data superposition device 30 for processing. The data conversion processing unit 202 performs corresponding conversion processing on the interactive data streams uploaded by participating users according to the relevant processing parameters sent by the interactive control unit 201 . That is, firstly, the data conversion processing unit 202 reads the cached interactive data stream from the above-mentioned first data cache unit 204, and then decodes and restores it, and then processes the video of the extracted interactive data stream according to the processing parameters sent by the interactive control unit 201. Image frame resolution size, color and other media attributes are converted, and the processed audio and video interactive data stream must have the same frame rate as the audio and video data stream of digital TV broadcast content provided by the content server in the network side digital TV broadcast server so that the subsequent data superimposing device 30 can perform superimposition processing according to one frame of the current program picture and one frame of participating video picture, and the audio part should also be processed according to the above rules. The data conversion processing unit 202 sends the converted audio-video interactive data stream to the subsequent data superposition processing device 30 for data superposition processing.

In addition, the interaction processing device 20 also includes a display unit 206 for displaying user-related information of each participating user. After the participating user sends an interaction request message, the relevant information of the user participating in the interaction will be stored in the participating user queuing unit 205, and the display unit 206 will also display the relevant information of the participating user. In addition to the user identification information of the interactive participating users, information such as the waiting time information of the participating users, the priority level of the participating users, and the duration of the interaction after the start of the interaction can also be displayed. It should be noted here that the information displayed by the display unit 206 can be displayed flexibly. Expansion and reduction. The main purpose of using the display unit 206 to display the relevant information of the participating users is to assist the management staff at the digital TV broadcasting server to better control the interaction process.

The communication channel of each constituent unit in the above-mentioned interactive processing device 20 is a control bus, and the interactive control unit 201 can control the specific work of other constituent units in the interactive processing device 20 through this control bus, and by connecting this control bus to on the channel of the digital TV broadcast server, so as to realize the communication with the digital TV broadcast server to complete the interactive control.

Please specifically refer to Fig. 4, this figure is the specific composition structural block diagram of data superposition device in the system of the present invention, mainly comprises second data cache unit 301 and data superposition processing unit 302 in the data superposition device 30, and the main function of each constituent unit is as follows:

The second data cache unit 301 is mainly used for caching the interactive data stream processed by the interactive processing device 20;

The data superposition processing unit 302 is mainly used for extracting the interactive data stream cached in the second data cache unit 301, and performing mixing and superimposition processing with the digital TV broadcast program data stream provided by the network side content server. The data superposition processing unit 302 is mainly responsible for data superposition processing of the digital TV content being played by the digital TV broadcast server and the interactive data stream sent by the participating users. When not participating in the interactive data flow sent by the user, the working unit is in an inactive state. When receiving a notification message from the interactive control unit 301 that the interaction is about to start, the data superposition processing unit 302 starts working and is ready to receive data from The processed user interaction data stream sent from the interaction processing device 20 . After the interaction starts, the data mixing and superimposing process is about to start. The data superimposing processing unit 302 obtains picture frames from the digital TV broadcast content being played, and at the same time obtains interactive audio and video picture frames of participating users from the above-mentioned second data cache unit 301. Then the two picture frames are mixed and superimposed. If the digital TV broadcast program allows multiple participating users to participate at the same time, the data superposition processing unit 302 superimposes the participating picture frames of the multiple participating users and the playing digital TV program picture frames together, and forms a new picture in the form of picture-in-picture frame. What needs to be explained here is that the interactive images of participating users are arranged to be played in a smaller video frame.

Please refer to FIG. 5 in detail. This figure is a block diagram of the specific composition and structure of the broadcast delivery device in the system of the present invention. The broadcast delivery device 40 mainly includes a coding modulation unit 401 and a broadcast distribution unit 402. The main functions of each component unit are as follows :

The encoding and modulation unit 401 is mainly used to perform encoding and modulation processing on the data stream superimposed by the above-mentioned data superposition device 30; that is, the encoding and modulation unit 401 converts the digital TV broadcast content or the interactive program content mixed with the user's audio and video interactive data stream After encoding, compression and modulation processing, it is sent to the broadcast distribution unit 402 described below.

The broadcast distribution unit 402 is mainly used for distributing the digital TV broadcast program superimposed with the interactive data stream with user participation processed by the above encoding and modulation unit 401 to each broadcast transmitter, and then each broadcast transmitter will superimpose the interactive data stream with user participation The digital TV broadcast program of the data stream is sent to each wireless communication terminal through the broadcast channel.

Wherein the above-mentioned data superposition device 30 and the broadcast delivery device 40 can be placed in the digital TV broadcast server on the network side at the same time, and the interactive processing device 20 can be placed in other peripheral devices of the digital TV broadcast server, as shown in FIG. 6 , It is a schematic diagram of the specific composition and structure of the digital TV broadcast server when the data superimposition device and the broadcast delivery device in the system of the present invention are placed in the digital TV broadcast server on the network side at the same time. In Figure 6, the digital TV broadcast server 100 includes the above data In addition to the superimposition device 30 and the broadcast distribution device 40, it also includes a content server 60 for providing digital TV broadcast content; The content of digital TV broadcasting is coded, modulated and distributed. If the content to be played has an interactive data stream, then after the interaction starts, the data superimposition device 30 will mix and superimpose the digital TV broadcast audio and video data stream provided by the content server 60 and the audio and video interactive data stream sent by the participating users, Then, the broadcast delivery is performed after being coded and modulated by the broadcast delivery device 40 .

In this way, the digital TV broadcast server (Broadcast Server) 100 can provide digital TV broadcast services, and broadcast digital TV programs to user groups who order digital TV broadcast services. At the same time, the digital TV broadcast server 100 can also interact with users when playing programs, so as to mix and superimpose the interactive video and audio data streams that users participate in and the data streams of digital TV broadcast programs that are currently being played, and perform downloading through the broadcast channel. hair.

Based on the above situation, please specifically refer to Fig. 7, which is a schematic diagram of data transmission between the digital TV broadcast server and the interactive processing device in the system of the present invention, and the interactive data between the interactive processing device 20 and the digital TV broadcast server 100 mainly includes interactive Control data and participate in the user's audio and video interactive data flow. Wherein the data channels in FIG. 7 are logically separated, and may be shared data transmission channels physically.

Based on the fact that the above-mentioned data superposition device 30 and the broadcast delivery device 40 are placed in the digital TV broadcast server on the network side at the same time, and the interactive processing device 20 is placed in other peripheral equipment of the digital TV broadcast server, two typical examples of the system of the present invention The composition structure is as follows:

Please specifically refer to Fig. 8, which is a schematic diagram of the first typical composition structure of the system of the present invention. The system includes a digital TV broadcast server 100, a smart phone 200 with camera and recording functions, and an interactive processing device 20 (as an independent network side equipment). This kind of networking mode can be mainly used in mobile TV technology or digital TV broadcasting technology mainly for mobile communication terminals. This kind of networking method can be undertaken based on MBMS or BCMCS in the third generation mobile communication system, or DVB-H; the interactive network can be a mobile communication network; the wireless communication terminal can be a smart phone with camera and recording functions. cell phone.

Please specifically refer to FIG. 9 , which is a schematic diagram of the second typical composition structure of the system of the present invention. The system mainly includes a digital TV broadcast server 100, an interactive processing device 20, a digital TV receiver 300 and a mobile communication network as an interactive system. The network is connected to the smart mobile terminal 400 of the digital television broadcasting server 100, and the smart mobile terminal 400 has camera and recording functions. Its broadcasting network can be the current mobile digital TV broadcasting network, and the interactive network can be a mobile communication network.

In addition, the above-mentioned data superposition device 30, broadcast delivery device 40 and interactive processing device 20 can also be placed in the digital TV broadcast server on the network side at the same time, that is, the interactive processing device 20 is a functional component of the digital TV broadcast server 100, The processing process of other components is the same as the above description. As shown in Fig. 10, it is a schematic diagram of the specific composition and structure of the digital TV broadcast server when the data superimposition device, the broadcast delivery device and the interactive processing device are placed in the digital TV broadcast server on the network side in the system of the present invention.

Correspondingly, the present invention also proposes a digital television broadcasting method based on wireless transmission, please refer to FIG. 11 , which is a flow chart of the main realization principle of the digital television broadcasting method based on wireless transmission in the present invention, and its main realization process is as follows:

Step S10, the user side sends the interactive data stream of the digital TV broadcast program broadcast by the network side to the network side through a wireless transmission channel; wherein before this, the network side can notify the user side that the user side can participate by sending a data message to the user side Into the digital TV broadcast program being broadcast on the network side, or by inserting subtitle messages in the broadcast digital TV broadcast program data stream to realize the notification that the user can participate in the digital TV broadcast program being broadcast on the network side, after the user determines to participate in the interaction , you can send the media interaction data stream of your own environment.

The wireless transmission channel mentioned here may be, but not limited to, a transmission channel in a mobile communication system.

Step S20, the network side processes the interactive data stream sent by the user side through the wireless transmission channel into a data format that can be superimposed with the digital TV broadcast program data stream being broadcast by the network side; wherein the network side processes the interactive data stream sent by the user side The specific process of stream conversion processing is as follows:

The network side first determines a set of control parameters for converting the interactive data stream sent from the user side according to the attribute parameters of the digital TV broadcast program data stream being broadcast;

The network side converts the interactive data stream sent by the user side through the wireless transmission channel into a data format that can be superimposed with the digital TV broadcast program data stream being broadcast on the network side according to the set of control parameters determined above.

Step S30, the network side performs data superposition processing on the converted interactive data stream and the digital TV broadcast program data stream being broadcast by the network side; the network side can combine the converted interactive data stream and the network side broadcasting The delivered digital TV broadcast program data stream is superimposed and processed into a picture-in-picture form for delivery.

Step S40, after the network side codes and modulates the superimposed data stream, it sends it to the user side through the broadcast channel for playback, wherein the network side can broadcast the coded and modulated superimposed data stream to each base station transmitter , and then each base station transmitter sends the superimposed data stream to the user side through the broadcast channel in the mobile communication system for playback; the network side can also broadcast the coded and modulated superimposed data stream to each digital TV broadcast transmitter, and then Each digital TV broadcast transmitter sends the superimposed data stream to the user side through the broadcast channel in the wireless digital broadcast TV network for playback.

That is, the main implementation process of the method of the present invention is: in the process of playing digital TV broadcast programs on the network side, the user may receive an interactive invitation issued by the network side, or may only receive the insertion of the digital TV broadcast program being played by the network side. interactive prompts. If users want to participate in the interaction, they can participate in the following two situations:

A. After the user receives the interaction invitation issued by the network side, the user directly sends a confirmation message through the terminal device to confirm participation in the interaction, and the network side can start the interaction after receiving the interaction confirmation message;

B. The user receives the interaction prompt, and the user sends a request message requesting to participate in the interaction to the network side through the terminal device. If the user is selected, a prompt message to start the interaction will be received. The message requires the user to confirm participation in the interaction, and the user confirms After that, the interactive session can begin;

When the interaction starts, the user turns on the video and audio collection device of the terminal device, the terminal device collects video and audio information, and at the same time, the terminal device uploads the collected audio and video information to the network side in real time through the interactive channel. The network side sends the processed video and audio data streams of participating users to the digital TV broadcast server. The digital TV broadcast server mixes the current program with the audio and video data streams of participating users and broadcasts them. The user terminal receives the audio and video data containing the participating users. Stream broadcast content for immediate playback.

Taking the application of the method of the present invention in the above-mentioned system of the present invention as an example, the specific implementation process of each link in the implementation process of the method of the present invention will be described in detail below.

Please refer to Figure 12, which is a schematic diagram of the processing process initiated by the interactive link in the method of the present invention, and the processing process initiated by the interactive link is as follows:

S1. The digital TV broadcast server broadcasts and delivers the digital TV broadcast content to the wireless communication terminal through the broadcast channel, and the wireless communication terminal receives and plays the digital TV broadcast content;

S2. The digital TV broadcast server controls the interactive control unit to enter the digital TV broadcast content interaction link;

S3. The interactive control unit sends a prompt message to the wireless communication terminal that can participate in the interaction. The prompt message can be presented in the program screen delivered by the broadcast, or can be sent directly to the wireless communication terminal device with interactive capabilities in the form of a short message. ;

S4. The wireless communication terminal sends a participation interaction request message to the interaction control unit, which may be sent in the form of a short message;

S5. The interactive control unit receives the interactive participation request message sent by the wireless communication terminal, and adds a related information of a participating user to the participating user queuing unit. Each time an interactive participation request message is received, a related information of a user is added until the acceptable Stop receiving request messages after the maximum number of participating users;

S6. The interaction control unit selects one or more participating user requesters based on a selection strategy formulated in advance and stored in the interaction control unit;

S7. The interaction control unit sends a notification message of "request for approval" to the selected participating users, and waits for the confirmation message sent back after the participating users respond;

S8. The interactive control unit can also directly send an interactive invitation message to a specific user, such as the interactive control unit can randomly send an invitation message to one or some wireless communication terminals with interactive capabilities, and wait for the user's response;

S9. The wireless communication terminal sends a confirmation message for participating in the interaction to the interaction control unit;

S10. The interaction control unit receives the interaction confirmation message sent by the wireless communication terminal, and the interaction control unit sends a message that the interaction is about to start to the data conversion processing unit, and the data conversion processing unit enters the state of preparing to process the interaction data after receiving the message;

S11. At the same time, after receiving the interactive confirmation message sent by the wireless communication terminal, the interaction control unit sends a message that the interaction is about to start to the digital TV broadcast server. The status of mixed and superimposed processing of the transmitted digital TV broadcast data stream.

Please specifically refer to Fig. 13, which is a schematic diagram of the specific processing process of the interactive link in the method of the present invention, and the processing process of the interactive link is as follows:

S10. After the interaction control unit sends a message that the interaction is about to start to the data conversion processing unit and the digital TV broadcast server, the interaction control unit acquires the digital TV broadcast content data currently being broadcast and distributed from the content server in the digital TV broadcast server flow;

S20. The interactive control unit generates a set of related control parameters according to the attribute parameters of the digital TV broadcast content data stream obtained above. These control parameters can control the data conversion processing unit to perform data format conversion processing on the interactive audio and video data streams uploaded by participating users. , to mix and superimpose with the digital TV broadcast content data stream currently being broadcast;

S30. The interactive control unit sends the above-mentioned determined control parameters to the data conversion processing unit;

S40. The wireless communication terminal acquires the audio and video information that the user participates in the interaction, and uploads the acquired audio and video information to the data identification unit through the wireless interaction channel in real time;

S50, after the data identification unit receives the data uploaded by the wireless communication terminal, combined with the user identification information stored in the user queuing unit to determine whether the data uploaded by the user is the data uploaded by the interacting user, if so, perform the following S60 ; Otherwise execute the following S70;

S60. The data identification unit forwards the data uploaded by the user to the data conversion processing unit for processing;

S70. If the data identification unit identifies that the uplink data is only common data, the data identification unit directly transparently transmits the uplink data to the digital TV broadcast server;

S80. If the data identification unit judges that the uplink data is the interactive audio and video data stream of the interactive link, first store the interactive audio and video data stream in the first data buffer unit on the side of the data conversion processing unit, and the data conversion processing unit processes the interactive audio and video data stream. During the audio and video data stream, the interactive audio and video data stream is directly extracted from the first data cache unit for data format conversion processing, and a part of the storage space in the first data cache unit is released after processing a part, and the interactive data stored in the first data cache unit The data is continuously updated until the interaction is terminated (the schematic diagram of storing the interaction data stream in the first data cache unit is not shown in FIG. 13 );

The data conversion processing unit reads the interactive data from the first data cache unit and processes it into the data format required by the control parameters sent by the interactive control unit, and then sends it to the data superimposing device in the digital TV broadcast server. Firstly, the data conversion processing unit reads the interactive data from the first data cache unit, and then adjusts the resolution of the video frame and media attributes such as color according to the control parameters sent by the interactive control unit. , the processed interactive data stream should have the same frame rate as the digital TV broadcast content data stream provided by the content server in the digital TV broadcast server, so that the data superposition device can press one frame of the current program picture and one frame of participant video The screen is superimposed.

S90. After receiving the interactive data stream from the data conversion processing unit, the digital TV broadcasting server stores it in the second data buffer unit, the mixing process starts, and the data superposition processing unit obtains picture frames from the currently playing digital TV broadcasting content , obtaining the interactive picture frame of the participating user from the second data cache unit, and then superimposing the two picture frames. If the interactive program allows multiple participants to participate in the interaction at the same time, the data superimposition processing unit superimposes the participation pictures of several participants and the program picture being played together, and forms a new picture frame in the form of picture-in-picture. The mixed video frames are continuously sent to the broadcast delivery device together with the accompanying audio;

S100. After the broadcast distribution device receives the incoming audio and video data, it encodes and compresses it, and sends it to the broadcast distribution unit after modulation. The broadcast distribution unit broadcasts and distributes the content mixed with the audio and video information of the interactive participants, wireless communication After receiving the broadcast content, the terminal plays the broadcast TV program in the form of picture-in-picture, presenting a certain (several) user-interactive screens with accompanying sound.

Please specifically refer to Fig. 14, which is a schematic diagram of the processing process of the end of the interactive link in the method of the present invention, and the processing process of the end of the interactive link is as follows:

S200. The interaction control unit detects that the participating users quit the interaction, or the interaction control unit actively terminates the participating users to continue the interactive processing;

S210. The interaction control unit deletes the relevant user information of the participating users who have stopped interacting in the participating user queuing unit;

S220. The interaction control unit sends an interaction end message to the data conversion processing unit, notifying the data conversion processing unit to stop processing the interaction data;

S230. The data conversion processing unit stops processing the interactive data;

S240. The interactive control unit sends an interaction end message to the data superimposing device in the digital TV broadcast server, and notifies the data superimposing device to stop superimposing and processing the interactive data;

S250. The data overlay device stops performing overlay processing on the interactive data;

S260. The digital TV broadcast server continues to play the common digital TV broadcast content without superimposed interactive images.

The specific implementation process of the method of the present invention is described in detail below in conjunction with the embodiment of instant interview:

1. Assume that the digital TV broadcast server is broadcasting a talk show live. As the program progresses, the host sends an invitation to the audience watching the program, expressing the hope that the audience will participate in the program and express their opinions (the user refers to the user who holds a wireless communication terminal users), and provide an interactive request access method, such as a URL or a short message number, etc.;

2. The staff starts the interactive processing device;

3. The interactive processing device is in an activated state, ready to accept requests from interactive participants at any time;

3. A viewer watching the program through a smart phone with video recording function sends an interaction request to the interaction processing device through the wireless interaction channel;

4. The interactive processing device saves the identification information of the requester in the participant queue;

5. The interaction processing device selects the user who sent the request first according to the order in which the participants send the request, and sends a notification message to tell the user that the interaction can start, and asks for confirmation;

6. The user receives the request approval notification, confirms participation in the interaction, and turns on the camera and recording device;

7. After receiving the confirmation message from the user, the interactive processing device starts data conversion processing;

8. The user starts shooting, recording, and uploads the audio and video data stream of answering the interview questions in real time;

9. The interactive processing device receives and processes the uploaded audio and video data stream according to the requirements of the interactive control unit, and sends it to the data superimposing device in the digital TV broadcast server after processing;

10. The data superposition device mixes the current program picture with the picture and voice of the participant answering the question, and transmits it to the broadcast delivery device while mixing;

11. The broadcast delivery device encodes and compresses the digital TV broadcast program mixed with the video and audio data streams that the participants answer the questions, modulates, and then broadcasts and delivers;

12. All viewers who are watching the program can see the interview screen in the form of picture-in-picture in the program screen;

13. After the audience finishes answering the interview questions, they quit the interaction, and the interactive control unit coordinates with other units in the interactive processing device to end the interactive processing.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (27)

1. A digital television broadcasting system based on wireless transmission, comprising a user side and a network side, characterized in that the user side includes: The wireless communication terminal is used to send the interactive data stream of the user's participation in the digital TV broadcast program to the network side through the wireless transmission channel, and is used to receive and play the digital TV broadcast program sent by the network side and superimposed with the interactive data stream of the user's participation; The network side includes: The interactive processing device is used to process the interactive data stream sent by the wireless communication terminal through the wireless transmission channel into a data format that can be superimposed with the digital TV broadcast program data stream broadcast on the network side; A data superimposition device, configured to perform data superposition processing on the interactive data stream processed by the interactive processing device and the digital TV broadcast program data stream broadcast on the network side; The broadcast delivery device is used to send the data stream superimposed by the data superposition device to the wireless communication terminal through a broadcast channel after encoding and modulation processing. 2. The system according to claim 1, wherein the wireless communication terminal specifically comprises: The data collection unit is used to collect multimedia data of the user's environment as an interactive data stream when the user participates in a digital TV broadcast program; The data sending unit is used to encode and modulate the interactive data stream collected by the data collecting unit, and send it to the network side through the wireless transmission channel; The data receiving unit is used to receive the digital TV broadcast program sent by the network side and superimposed with the interactive data stream participated by the user; The program playing unit is used to demodulate and decode the digital TV broadcast program data stream received by the data receiving unit and superimposed with the interactive data stream participated in by the user, and then play it for the user to watch. 3. The system according to claim 1 or 2, wherein the wireless communication terminal is: A mobile phone terminal with a multimedia information collection component; or Personal digital assistant terminals with multimedia information collection components; or A combined device that combines a digital television receiver with a terminal capable of wireless broadband communication. 4. The system according to claim 1, wherein the interactive processing device specifically comprises: The interactive control unit is used to notify the user of the start message and termination message of the interactive link that the user can participate in the digital TV broadcast program, and to monitor the interactive process; at the same time, it is also used to broadcast according to the attributes of the digital TV broadcast program data stream broadcast by the network side. Parameters define a set of control parameters for transforming the Interactive Data Stream; The data conversion processing unit is used to convert and process the interactive data stream sent by the wireless communication terminal through the wireless transmission channel into a digital TV broadcast program data stream that can be broadcast with the network side according to a set of control parameters determined by the interactive control unit Data format for overlay. 5. The system according to claim 4, wherein the interaction control unit notifies the user of the start message and termination message of the interactive session by sending a data message to the wireless communication terminal. 6. The system according to claim 4, wherein the interactive control unit notifies the start message and termination message of the interactive link by inserting subtitle messages into the data stream of the digital TV broadcast program delivered by the network side. user. 7. The system according to claim 4, wherein the interactive processing device further includes a data identification unit, which is used to identify the user's participation in the digital TV broadcast program in the data sent by the wireless communication terminal through the wireless transmission channel. The interactive data stream is sent to the data conversion processing unit for conversion processing. 8. The system according to claim 4, wherein the interactive processing device further includes a first data buffer unit, configured to buffer the interactive data stream sent by the wireless communication terminal through the wireless transmission channel, the The data conversion processing unit extracts the interaction data stream from the first data cache unit to perform conversion processing. 9. The system according to claim 4, wherein the interaction processing device further comprises a user queuing unit for queuing the participating users who send requests to participate in the interaction according to a specified strategy, and the interaction control unit according to The queuing result of the participating user queuing unit selects each participating user in turn, and sends the start message of the interactive link to the selected participating users. 10. The system according to claim 9, wherein the participating user queuing unit performs queuing processing for each participating user sequentially according to the priority order of each participating user. 11. The system according to claim 9, wherein the participating user queuing unit performs queuing processing for each participating user in sequence according to the order in which each participating user sends the interaction request message. 12. The system according to claim 4, wherein the interaction processing device further comprises a display unit for displaying user-related information of each participating user. 13. The system according to claim 1, wherein the data superimposition device specifically comprises: a second data cache unit, configured to cache the interactive data stream processed by the interactive processing device; The data superposition processing unit is configured to extract the cached interactive data stream from the second data cache unit, and perform superposition processing with the digital TV broadcast program data stream provided by the content server on the network side. 14. The system according to claim 1, characterized in that, the broadcast delivery device specifically includes: An encoding and modulation unit, configured to perform encoding and modulation processing on the data stream superimposed by the data superposition device; A broadcast distribution unit, configured to distribute the digital TV broadcast program superimposed with user-participated interactive data streams processed by the coding and modulation unit to each broadcast transmitter, and each broadcast transmitter will superimpose user-participated interactive data streams Streaming digital TV broadcast programs are sent to the wireless communication terminal through a broadcast channel. 15. The system according to claim 1, wherein the interactive processing device, the data superimposing device and the broadcast sending device are simultaneously placed in the digital TV broadcast server on the network side. 16. The system according to claim 1, characterized in that the data superimposition device and the broadcast delivery device are placed in the digital TV broadcast server on the network side at the same time, and the interactive processing device is placed on the periphery of the digital TV broadcast server in other devices. 17. The system according to claim 1 or 2, characterized in that the wireless communication terminal sends the interactive data stream of the user participating in the digital TV broadcast program to the network side through the transmission channel of the mobile communication system. 18. The system according to claim 1 or 14, characterized in that, after the broadcast delivery device codes and modulates the data stream superimposed and processed by the data superposition device, it sends it to the broadcast channel of the mobile communication system wireless communication terminal. 19. The system according to claim 1 or 14, characterized in that, after the broadcast sending device encodes and modulates the data stream superimposed by the data superimposition device, it downloads the broadcast channel through the wireless digital broadcast television network. sent to the wireless communication terminal. 20. A digital television broadcasting method based on wireless transmission, characterized in that it comprises the steps of: The user side sends the interactive data stream of the digital TV broadcast program participating in the network side broadcast to the network side through the wireless transmission channel; The network side processes the interactive data stream sent by the user side through the wireless transmission channel into a data format that can be superimposed with the digital TV broadcast program data stream broadcast by the network side; and Perform data superposition processing on the processed interactive data stream and the digital TV broadcast program data stream broadcast on the network side; After the network side encodes and modulates the superimposed data stream, it sends it to the user side through the broadcast channel for playback. 21. The method according to claim 20, further comprising the network side sending a data message to the user side to notify the user side that the user side can participate in the digital TV broadcast program being broadcast by the network side. 22. The method according to claim 20, further comprising inserting a subtitle message into the broadcasted digital TV broadcast program data stream on the network side to notify users that they can participate in the digital TV broadcast program being broadcast on the network side. 23. The method according to claim 20, wherein the wireless transmission channel is a transmission channel in a mobile communication system. 24. The method according to claim 20, wherein the process of the network side processing the interactive data stream sent from the user side specifically includes: The network side determines a set of control parameters for converting the interactive data stream according to the attribute parameters of the broadcast digital TV broadcast program data stream; and According to the determined group of control parameters, the interactive data stream sent by the user side through the wireless transmission channel is converted and processed into a data format capable of being superimposed with the digital TV broadcast program data stream broadcast by the network side. 25. The method according to claim 20, characterized in that the network side superimposes the processed interactive data stream and the digital TV broadcast program data stream broadcast by the network side into a form of picture-in-picture. 26. The method according to claim 20, wherein the network side broadcasts the coded and modulated superimposed data stream to each base station transmitter; The transmitters of the base stations send the superimposed data streams to the user side through the broadcast channel in the mobile communication system for playback. 27. The method according to claim 20, characterized in that the network side broadcasts the coded and modulated superimposed data stream to each digital TV broadcast transmitter; Each digital TV broadcast transmitter sends the superimposed data stream to the user side through the broadcast channel in the wireless digital broadcast TV network for playing.

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