CN101827201A - Set-top box and digital television playing system - Google Patents

Abstract

The invention discloses a set-top box and a digital TV playing system. The set-top box includes: a digital signal receiving and sending unit, used to receive the digital signal of the multimedia program sent by the digital TV server, or send the digital signal of the multimedia program stored in the multimedia program storage unit to the digital TV server; the multimedia program storage unit is used for Store the multimedia program transmitted by the digital TV server, or the multimedia program provided by the set-top box; the digital signal processing unit is used to decrypt the digital signal of the multimedia program received by the digital signal receiving and sending unit, or decrypt the digital signal of the multimedia program stored in the multimedia program storage unit The digital signal is encrypted; the audio-video digital-to-analog conversion unit is used to convert the digital signal of the multimedia program decrypted by the digital signal processing unit into an analog signal. Thereby, the set-top box provided by the present invention has the functions of receiving digital TV signals and sending digital TV signals at the same time.

Description

A set-top box and digital television broadcasting system

technical field

The invention belongs to the technical field of digital television, and in particular relates to a set-top box and a digital television playing system.

Background technique

The digital home refers to the formation of a home network based on various family communication products, computer products, and consumer electronics products according to the needs of family digitization, and through external network access and social all-round information interaction, to form a home entertainment, control service and Information function system. The digital home will realize human's demand for digital and intelligent life, change people's life style, and provide people with convenient, safe, intelligent and comfortable digital life. In the 21st century, the development of digital home and digital TV industry is closely related to the degree of informatization of national life. The digital TV service is an indispensable part of the digital home service. In the increasingly technological modern society, the digital TV service will be increasingly popular and applied to the vast number of families.

At present, the domestic digital TV business is basically still in the stage of one-way viewing. In the previous overall conversion of digital TV in some provinces and cities, most of the distribution to users is a one-way set-top box, and the broadcasting mode of the digital TV broadcasting system is also one-way. But the one-way transmission cable TV network can only realize the one-way transmission and charging of cable TV programs. This makes the form of the digital TV service single, and cannot provide a wider range of digital TV program multi-directional services for the majority of users, and cannot meet people's ever-expanding sharing needs of digital TV programs.

In summary, there are shortcomings in the set-top box and the digital television broadcasting system in the prior art, and there are obviously inconveniences and defects in actual use, so it is necessary to improve them.

Contents of the invention

For above-mentioned defective, the object of the present invention is to provide a kind of set-top box and digital television broadcasting system, to provide the set-top box with receiving digital television signal and send digital television signal simultaneously; And have the digital television broadcasting system of two-way playing digital television program.

In order to achieve the above object, the present invention provides a kind of set-top box, is arranged on client end, comprises central processing unit, is used for converting the digital signal of the multimedia program that is arranged on the digital television server transmission of server end, and described set-top box also includes:

A digital signal receiving and sending unit, connected to the central processing unit, for receiving the digital signal of the multimedia program sent by the digital TV server, or sending the digital signal of the multimedia program stored in the multimedia program storage unit to the digital TV server ;

A multimedia program storage unit, connected to the central processing unit, for storing the multimedia programs transmitted by the digital TV server, or the multimedia programs provided by the set-top box;

A digital signal processing unit, connected to the central processing unit, for decrypting the digital signal of the multimedia program received by the digital signal receiving and sending unit, or encrypting the digital signal of the multimedia program stored in the multimedia program storage unit ;

The audio-video digital-to-analog conversion unit is connected to the digital signal processing unit, and is used for converting the digital signal of the multimedia program decrypted by the digital signal processing unit into an analog signal.

Further, the set-top box also includes:

An on-demand unit, connected to the central processing unit, for receiving the multimedia program on-demand request transmitted by the digital TV server, and authenticating the on-demand request; or

A multimedia program playback unit, connected to the audio-video digital-to-analog conversion unit, for playing the analog signal converted by the audio-video digital-to-analog conversion unit from the digital signal of the multimedia program; or

An Internet connection unit, connected to the central processing unit, for connecting the set-top box to the Internet; or

An input unit, connected to the central processing unit, is used for inputting multimedia program information to the multimedia program storage unit.

Further, the set-top box also includes:

The charging unit is connected to the ordering unit, and is used for charging the ordering request after the ordering unit successfully authenticates the request for ordering multimedia programs transmitted by the digital TV server.

Further, the digital signal receiving and sending unit includes:

A digital signal receiving module, configured to receive the digital signal of the multimedia program sent by the digital TV server;

The digital signal sending module is used to send the digital signal of the multimedia program encrypted by the digital signal processing unit and stored in the multimedia program storage unit to the digital TV server.

Further, the multimedia program storage unit includes:

Receiving digital TV program storage module, used for storing the digital signal multimedia program sent by the digital TV server received by the digital signal receiving and sending unit;

The on-demand digital TV program storage module is used for storing the digital signal multimedia program provided by the set-top box.

Further, the digital signal processing unit includes:

A digital signal decryption module, configured to decrypt the digital signal of the multimedia program sent by the digital TV server received by the digital signal receiving and sending unit;

The digital signal encryption module is used for encrypting the digital signal played by the multimedia program stored in the multimedia program storage unit.

Further, the audio-video digital-to-analog conversion unit includes:

An audio digital-to-analog conversion module, configured to convert the audio digital signal decrypted by the digital signal processing unit into an audio analog signal;

The video digital-to-analog conversion module is used to convert the video digital signal decrypted by the digital signal processing unit into a video analog signal.

Further, the on-demand unit includes:

A registration module, configured to receive requests from other users sent by the digital TV server to register as users who watch multimedia programs stored in the multimedia program storage unit, and record the requests of other users;

An on-demand request module, configured to receive other users' requests for on-demand multimedia programs stored in the multimedia program storage unit transmitted by the digital TV server;

An authentication module, configured to authenticate the on-demand request of the multimedia program received by the on-demand request module according to the record of the registration module.

, the multimedia program playback unit includes:

An audio playback module, configured to play the audio analog signal converted by the audio and video digital-to-analog conversion unit from the audio digital signal;

The video playing module is used to play the video analog signal converted from the video digital signal by the audio-video digital-to-analog conversion unit.

In order to achieve another object of the present invention, the present invention also provides a system for realizing digital television playback by using the above-mentioned set-top box, the system includes a digital television server and a plurality of set-top boxes, and the set-top box includes:

A digital signal receiving and sending unit, connected to the central processing unit, for receiving the digital signal of the multimedia program sent by the digital TV server, or sending the digital signal of the multimedia program stored in the multimedia program storage unit to the digital TV server ;

A multimedia program storage unit, connected to the central processing unit, for storing the multimedia programs transmitted by the digital TV server, or the multimedia programs provided by the set-top box;

A digital signal processing unit, connected to the central processing unit, for decrypting the digital signal of the multimedia program received by the digital signal receiving and sending unit, or encrypting the digital signal of the multimedia program stored in the multimedia program storage unit ;

The audio-video digital-to-analog conversion unit is connected to the digital signal processing unit, and is used for converting the digital signal of the multimedia program decrypted by the digital signal processing unit into an analog signal.

In the present invention, the set-top box is configured to at least include a central processing unit, a digital signal receiving and sending unit, a multimedia program storage unit, a digital signal processing unit, and an audio-video digital-to-analog conversion unit. The digital signal processing unit can not only convert the digital The digital signal of the digital TV program received by the signal receiving and sending unit is decrypted, and the digital signal of the digital TV program provided by the set-top box can also be encrypted. After receiving the user request of other clients, the digital TV program provided by the set-top box The digital signal of the encrypted digital TV program signal is sent to the digital TV server, and the digital TV server transmits the digital signal of the encrypted digital TV program signal to other clients for playback. Therefore, the set-top box provided by the present invention has the functions of bidirectionally transmitting and playing digital TV programs. In addition, the digital TV broadcasting system provided by the present invention, which uses the set-top box to realize digital TV broadcasting, also realizes not only the function of providing digital TV programs for users at the server side, but also the function of providing digital TV programs at the client side. Therefore, the service condition of the business of the digital TV program is optimized, and a wider technical bridge is provided for the development of the digital TV.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the structural representation of the set-top box provided by the present invention;

Fig. 2 is a schematic structural view of a set-top box provided by an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a set-top box provided by another embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a set-top box provided by another embodiment of the present invention;

Fig. 5 is a schematic structural diagram of a set-top box provided by another embodiment of the present invention;

Fig. 6 is a schematic diagram of the composition of the system for providing digital television broadcasting according to the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The basic idea of the present invention is: the set-top box is set to at least comprise the structure of central processing unit, digital signal receiving and sending unit, multimedia program storage unit, digital signal processing unit and audio-video digital-to-analog conversion unit, receive and send by digital signal receiving and sending unit Send digital TV program signals to realize the two-way transmission of the set-top box and the function of playing digital TV programs.

Referring to Fig. 1 and Fig. 6, the present invention provides a kind of set-top box 1, and this set-top box 1 is arranged on the client end, comprises central processing unit 11, is used for converting the digital signal of the multimedia program that is arranged on the digital television server 2 transmission of server end, set-top box 1 also includes:

The digital signal receiving and sending unit 12 is connected to the central processing unit 11, and is used to receive the digital signal of the multimedia program sent by the digital TV server 2, or send the digital signal of the multimedia program stored in the multimedia program storage unit 13 to the digital TV server 2;

The multimedia program storage unit 13 is connected to the central processing unit 11, and is used to store the multimedia program transmitted by the digital television server 2, or the multimedia program provided by the set-top box 1;

The digital signal processing unit 14 is connected to the central processing unit 11, and is used for decrypting the digital signal of the multimedia program received by the digital signal receiving and transmitting unit 12, or encrypting the digital signal of the multimedia program stored in the multimedia program storage unit 13;

The audio-video digital-to-analog conversion unit 15 is connected to the digital signal processing unit 14, and is used for converting the digital signal of the multimedia program decrypted by the digital signal processing unit 14 into an analog signal.

The set-top box 1 that provides among the present invention has two-way function, and promptly this set-top box 1 both can convert the digital signal of the multimedia program that digital television server 2 sends into analog signal, plays the use of digital television program for present vast television users; Can also simultaneously Send digital signals of multimedia programs to users of other clients for viewing by users of other clients.

Referring to FIG. 2, in one embodiment of the present invention, the digital signal receiving and sending unit 12 includes:

Digital signal receiving module 121, is used for receiving the digital signal of the multimedia program that digital TV server 2 sends; The multimedia program provided by the server 2 may also be a multimedia program provided by other clients to the set-top box 1 through the digital TV server 2 . These multimedia programs are encrypted digital signals, including encryption of audio digital signals or video digital signals, and both video and audio digital signals are encrypted. After the digital signal receiving module 121 receives the digital signal of the multimedia program, it is sent to the central processing unit 11, if the user is set to store the multimedia program, then the central processing unit 11 will store the multimedia program in the multimedia program storage unit 13, otherwise The digital-to-analog conversion of the multimedia program will be performed by the audio-video digital-to-analog conversion unit 15 .

The digital signal sending module 122 is used for sending the digital signal of the multimedia program encrypted by the digital signal processing unit 14 and stored in the multimedia program storage unit 13 to the digital TV server 2 . When the set-top box 1 serves as a multimedia program provider, in order to ensure the benefits provided, the digital signal of the multimedia program it provides needs to be encrypted, and the encrypted digital signal of the multimedia program is sent out by the digital signal sending module 122 .

For the multimedia program storage unit 13, it includes:

Receive the digital TV program storage module 131, be used for storing the multimedia program of the digital signal sent by the digital TV server 2 that the digital signal receiving and sending unit 12 receives; While playing the TV program of the digital signal, this program resource can be stored in the receiving In the digital TV program storage module 131 , of course, the user can also just play the TV program in real time according to his needs, without storing the TV program resources in the received digital TV program storage module 131 .

The on-demand digital TV program storage module 132 is used for storing the digital signal multimedia program provided by the set-top box 1 . When the set-top box 1 serves as a provider of multimedia digital television programs, the digital television program on demand storage module 132 of the set-top box 1 stores corresponding multimedia digital television programs. The form of the program is various, and it can be news, TV drama, movie; it can also be FLASH animation, radio program; or electronic book, etc.

Preferably, in this embodiment, the digital signal processing unit 14 includes: a digital signal decryption module 141 for decrypting the digital signal of the multimedia program received by the digital signal receiving and sending unit 12 and sent by the digital TV server 2 . The central processing unit 11 sends the digital signal of the multimedia program received by the digital signal receiving module 121 to the digital signal decrypting module 141 for decryption.

Generally speaking, the digital signal of the multimedia program sent by the digital TV server 2 is all processed through scrambling, and the digital signal decryption module 141 sends the digital signal sent by the digital TV server 2 received by the digital signal receiving and sending unit 12 according to the pre-agreed descrambling method. The digital signal of the multimedia program is decrypted to restore the multimedia program.

The digital signal encryption module 142 is used for encrypting the digital signal played by the multimedia program stored in the multimedia program storage unit 13 . When set-top box 1 provides multimedia programs to users of other clients, the digital signal played by its multimedia programs needs to be encrypted, and central processing unit 11 provides multimedia programs to users of other clients with the set-top box 1 stored in multimedia program storage unit 13, and sends to A digital signal encryption module 142, and controls the digital signal encryption module 142 to encrypt digital video signals and/or digital audio signals. Encryption algorithms include encrypted motion vector algorithm, DCT block coefficient layered encryption algorithm and other encryption algorithms.

In addition, in this embodiment, the audio-video digital-to-analog conversion unit 15 includes: an audio digital-to-analog conversion module 151, which is used to convert the audio digital signal decrypted by the digital signal processing unit 14 into an audio analog signal; a video digital-to-analog conversion module 152, For converting the video digital signal decrypted by the digital signal processing unit 14 into a video analog signal. Since most users currently use analog TVs, the audio digital-to-analog conversion module 151 provided by the present invention can convert the decrypted audio digital signals into audio analog signals, which is suitable for broadcasting analog signals on TV. The video digital-to-analog conversion module 152 converts the decrypted video digital signal into a video analog signal.

Referring to Fig. 3, in another embodiment of the present invention, set-top box 1 also includes:

Order unit 16, connected to central processing unit 11, is used for receiving the multimedia program order request that digital television server 2 transmits, and this order request is authenticated; Or

The multimedia program playback unit 17 is connected to the audio-video digital-to-analog conversion unit 15, and is used to play the analog signal converted by the audio-video digital-to-analog conversion unit 15 by the digital signal of the multimedia program; or

The Internet connection unit 18 is connected to the central processing unit 11 for connecting the set-top box 1 to the Internet; or

The input unit 19 is connected to the central processing unit 11 and used for inputting multimedia program information to the multimedia program storage unit 13 .

Referring to Fig. 5, in this embodiment, set-top box 1 of the present invention has included on-demand unit 16, and preferred on-demand unit 16 comprises:

The registration module 161 is used to receive the request sent by other users through the digital TV server 2, registered as a user to watch the multimedia program stored in the multimedia program storage unit 13, and record the request of the other user;

Ordering request module 162, for receiving the multimedia program request stored in other user's ordering multimedia program storage unit 13 that digital TV server 2 transmits;

The authenticating module 163 is configured to authenticate the on-demand request of the multimedia program received by the on-demand request module 162 according to the record of the registration module 161 .

When the set-top box 1 is used as a digital television program provider, in order to ensure the benefits provided, a registration authentication mechanism needs to be set, if users of other clients need to watch the multimedia programs stored in the multimedia program storage unit 13; they need to request registration from the registration module 161 as For its users, the registered information includes user name, user password and other relevant information. After the registration was completed, users at other clients transmitted the multimedia program request stored in the on-demand multimedia program storage unit 13 through the digital television server 2; The on-demand request of the multimedia program received by the requesting module 162 is authenticated. After the authentication is successful, the digital signal processing unit 14 is encrypted by the digital signal sending module 122, and the digital signal of the multimedia program stored in the multimedia program storage unit 13 is sent to the digital TV server 2; A user of the client broadcasts the multimedia program.

Referring to Fig. 4, in another embodiment of the present invention, billing unit 20 is connected with order unit 16, is used for after order unit 16 is to the multimedia program order request authentication that digital TV server 2 transmits successfully, to described order The billing is requested, and the function of bidirectional transmission and conversion of multimedia programs of the set-top box 1 is realized.

Referring to Fig. 5, in one embodiment of the present invention, the set-top box 1 provided has included the multimedia program playback unit 17, and the multimedia program playback unit 17 has included: audio playback module 171, is used for playing audio-video digital-to-analog conversion unit 15 and described The audio analog signal converted from the audio digital signal; the video playing module 172, configured to play the video analog signal converted by the audio video digital-to-analog conversion unit 15. Therefore, through this unit, the analog signal converted from the digital signal of the multimedia program by the audio-video digital-to-analog conversion unit 15 can be played; which includes audio analog signal and audio digital signal. The existing TV set and the set-top box 1 are made into an integrated machine.

The set-top box 1 also includes an Internet connection unit 18, which can realize the Internet access function of the set-top box 1, and further expand the functions of the set-top box 1. The user can utilize other operating terminals provided by the set-top box 1, such as a mouse, a keyboard, or a remote controller to surf the Internet.

The input unit 19 is connected to the central processing unit 11, which includes multiple communication interfaces, such as USB interface, 1394 interface, radio frequency interface, 1284 interface, 802.11 interface, IR (Infrared, infrared), interface, RS-232 interface, etc. The multimedia program information can be input to the multimedia program storage unit 13 through these communication interfaces.

In the present invention, the digital signal processing unit 14 is a digital signal processor. The digital signal processing unit 14 includes an audio/video input interface, an audio/video output interface, a memory input interface, a PCI (Peripheral Component Interconnect, external component interconnection) interface, and an Internet network connection interface.

Referring to Fig. 6, the present invention also provides a kind of system 3 that utilizes the set-top box 1 provided by above-mentioned multiple embodiments to realize digital television broadcasting, and described system comprises digital television server 2 and a plurality of set-top boxes 1, and set-top box 1 also comprises:

The digital signal receiving and sending unit 12 is connected to the central processing unit 11, and is used to receive the digital signal of the multimedia program sent by the digital TV server 2, or send the digital signal of the multimedia program stored in the multimedia program storage unit 13 to the digital TV server 2;

The multimedia program storage unit 13 is connected to the central processing unit 11, and is used to store the multimedia program transmitted by the digital television server 2, or the multimedia program provided by the set-top box 1;

The digital signal processing unit 14 is connected to the central processing unit 11, and is used for decrypting the digital signal of the multimedia program received by the digital signal receiving and transmitting unit 12, or encrypting the digital signal of the multimedia program stored in the multimedia program storage unit 13;

The audio-video digital-to-analog conversion unit 15 is connected to the digital signal processing unit 14, and is used for converting the digital signal of the multimedia program decrypted by the digital signal processing unit 14 into an analog signal.

Other specific structures of the set-top box 1 in the digital television broadcasting system 3 have been described in the above-mentioned multiple embodiments, and will not be repeated here.

In summary, the present invention sets the set-top box to at least include a central processing unit, a digital signal receiving and sending unit, a multimedia program storage unit, a digital signal processing unit and an audio-video digital-to-analog conversion unit, and the digital signal processing unit not only The digital signal of the digital TV program received by the digital signal receiving and sending unit can be decrypted, and the digital signal of the digital TV program provided by the set-top box can also be encrypted. After receiving the user request of other clients, the set-top box The provided digital signal of the digital TV program is sent to the digital TV server, and the digital TV server transmits the encrypted digital signal of the digital TV program signal to other clients for playing. Therefore, the set-top box provided by the present invention has the functions of bidirectionally transmitting and playing digital TV programs. In addition, the digital TV broadcasting system provided by the present invention, which uses the set-top box to realize digital TV broadcasting, also realizes not only the function of providing digital TV programs for users at the server side, but also the function of providing digital TV programs at the client side. Therefore, the service condition of the business of the digital TV program is optimized, and a wider technical bridge is provided for the development of the digital TV.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (10)

1. a set-top box is arranged at client, comprises CPU, is used to change the digital signal of the multimedia programming of the digital television server transmission that is arranged at server end, it is characterized in that described set-top box also comprises:

Digital signal receives transmitting element, be connected in described CPU, be used to receive the digital signal of the multimedia programming that described digital television server sends, perhaps send the digital signal of the multimedia programming that is stored in the multimedia programming memory cell to described digital television server;

The multimedia programming memory cell is connected in described CPU, is used to store the multimedia programming that described digital television server transmits, the multimedia programming that perhaps described set-top box provides;

Digital signal processing unit, be connected in described CPU, the digital signal that is used for described digital signal is received the multimedia programming that transmitting element receives is decrypted, and perhaps the digital signal of the multimedia programming of described multimedia programming cell stores is encrypted;

The audio frequency and video D/A conversion unit is connected in described digital signal processing unit, is used for the digital signal of the described multimedia programming of described digital signal processing unit deciphering is converted to analog signal.

2. set-top box according to claim 1 is characterized in that, described set-top box also comprises:

The program request unit is connected in described CPU, is used to receive the multimedia programming order request that described digital television server transmits, and this order request is carried out authentication; Perhaps

The multimedia programming unit is connected in described audio frequency and video D/A conversion unit, is used to play the analog signal of described audio frequency and video D/A conversion unit with the digital signal conversion of described multimedia programming; Perhaps

The internet linkage unit is connected in described CPU, is used for described set-top box is connected into the internet; Perhaps

Input unit is connected in described CPU, is used for to described multimedia programming memory cell input multimedia programming information.

3. set-top box according to claim 1 is characterized in that, described set-top box also comprises:

Charging Detail Record unit is connected in described program request unit, after the multimedia programming order request authentication success that is used in described program request unit described digital television server being transmitted, described order request is chargeed.

4. set-top box according to claim 1 is characterized in that, described digital signal receives transmitting element and comprises:

The digital signal receiver module is used to receive the digital signal of the multimedia programming that described digital television server sends;

The digital signal sending module is used for the digital signal with the multimedia programming that is stored in described multimedia programming memory cell of described digital signal processing unit encryption, sends to described digital television server.

5. set-top box according to claim 1 is characterized in that, described multimedia programming memory cell comprises:

Receiving digital television program storage module is used to store the multimedia programming that described digital signal receives the digital signal that described digital television server that transmitting element receives sends;

Program request digital television program memory module is used to store the multimedia programming of the digital signal that described set-top box provides.

6. set-top box according to claim 1 is characterized in that, described digital signal processing unit comprises:

The digital signal deciphering module is used to decipher the digital signal that described digital signal receives the multimedia programming that described digital television server that transmitting element receives sends;

The digital signal encrypting module is used to encrypt the digital signal of the multimedia programming of described multimedia programming cell stores.

7. set-top box according to claim 1 is characterized in that, described audio frequency and video D/A conversion unit comprises:

The audio frequency D/A converter module is used for the audio digital signals of described digital signal processing unit deciphering is converted to audio analog signals;

The video D/A converter module is used for the video signal of described digital signal processing unit deciphering is converted to video analog signal.

8. set-top box according to claim 2 is characterized in that, described program request unit comprises:

Registering modules is used to receive other users and sends by described digital television server, and the multimedia programming that is registered as described multimedia programming cell stores is watched user's request, and record is carried out in described other users' request;

The order request module is used to receive the multimedia programming request of the described multimedia programming cell stores of other user's program requests that described digital television server transmits;

Authentication module is used for the described record according to described Registering modules, and the order request of the described multimedia programming that described order request module is received is carried out authentication.

9. set-top box according to claim 2 is characterized in that, described multimedia programming unit comprises:

Audio playing module is used to play the audio analog signals of described audio frequency and video D/A conversion unit with described audio digital signals conversion;

The video playback module is used to play the video analog signal of described audio frequency and video D/A conversion unit with described video signal conversion.

10. one kind is utilized any described set-top box of claim 1 to 9 to realize the system that Digital Television is play, and described system comprises digital television server and a plurality of described set-top box, it is characterized in that described set-top box comprises:

Digital signal receives transmitting element, be connected in described CPU, be used to receive the digital signal of the multimedia programming that described digital television server sends, perhaps send the digital signal of the multimedia programming that is stored in the multimedia programming memory cell to described digital television server;

The multimedia programming memory cell is connected in described CPU, is used to store the multimedia programming that described digital television server transmits, the multimedia programming that perhaps described set-top box provides;

Digital signal processing unit, be connected in described CPU, the digital signal that is used for described digital signal is received the multimedia programming that transmitting element receives is decrypted, and perhaps the digital signal of the multimedia programming of described multimedia programming cell stores is encrypted;

The audio frequency and video D/A conversion unit is connected in described digital signal processing unit, is used for the digital signal of the described multimedia programming of described digital signal processing unit deciphering is converted to analog signal.

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