CN201328151Y - Mobile receiving system for mobile digital television signals - Google Patents

Abstract

The utility model discloses a movable receiving system for mobile digital TV signals, which comprises an antenna device, a receiving demodulation chip, an interface circuit and a portable terminal; the antenna device includes a built-in microstrip antenna and a detachable external TV antenna, the The built-in microstrip antenna and the external TV antenna are connected to the receiving demodulation chip by multiplexing a high-frequency socket; the mobile digital TV signal is sent to the The receiving and demodulating chip, after the receiving and demodulating chip completes signal demodulation and decoding processing, sends the processed signal to the portable terminal through the interface circuit. The receiving system of the utility model uses a portable data card as a carrier, improves the signal receiving capability of the terminal, and broadens the coverage of mobile digital TV signals by means of a detachable external TV antenna.

Description

Mobile Digital TV Signal Receiving System

technical field

The utility model relates to the field of mobile digital television, in particular to a mobile receiving system for mobile digital television signals.

Background technique

With the improvement of material living standards, digital TV has been used by more and more people. Compared with traditional analog TV, digital TV greatly reduces the loss of signal during transmission through digital coding and compression of information, and can provide users with clearer images, multi-channel stereo, and more channels. Quantity and rich service content, such as electronic program guide, data broadcasting, video and audio on demand, etc. At present, the digital TVs that the majority of users come into contact with are divided into terrestrial digital TVs, such as cable digital TVs, bus TVs, etc.; and mobile digital TVs, such as mobile phone TVs. However, the two technologies currently have their own limitations in the scope of application.

1) Cable digital TV - poor usability, non-removable:

At present, most user terminals use analog TV sets, and digital TV set-top boxes must be used in the process of use. As shown in Figure 1, the user connects the home coaxial cable to the digital TV set-top box, and then uses a video cable to connect to the TV video. input terminal, and then use the remote control of the digital TV set-top box to select channels and programs. For a plurality of TV sets in the family, it is necessary to adopt the mode that one set-top box is equipped with one set-top box, which will inevitably bring inconvenience to the user and increase the hardware cost at the same time.

2) Mobile digital TV (such as mobile phone TV) - poor indoor signal

Restricted by the size of the terminal equipment, the antenna used by the mobile terminal equipment is small in size, low in antenna efficiency, and narrow in bandwidth. When the user is in an indoor location far away from doors and windows, or in a high-density urban area, the ability of the antenna to receive signals will decrease. , resulting in the inability to receive mobile digital signals. This greatly affects the user's experience in watching TV programs.

To sum up, the existing digital mobile TV terminal receiving system has the following deficiencies: the cable digital TV terminal connection is complicated, and the receiving terminal must be constructed by loading a digital set-top box into the TV, which cannot meet the needs of users to watch digital TV in a mobile environment. On the other hand, although mobile TV terminals such as mobile TV meet the needs of users to watch digital TV in a mobile environment, the antenna size of the mobile terminal is small, resulting in low antenna efficiency and narrow bandwidth. The location of the window or the high-density building environment will cause difficulties in receiving signals.

Utility model content

The technical problem to be solved by the utility model is to provide a mobile digital TV signal mobile receiving system, to improve the performance (such as gain, coverage area) of the antenna of the mobile terminal equipment, no matter indoor or outdoor, the mobile TV signal can be received, Improve the user's audio-visual experience.

In order to solve the above problems, the utility model provides a mobile digital TV signal mobile receiving system, including an antenna device, a receiving demodulation chip, an interface circuit and a portable terminal; the antenna device includes a built-in microstrip antenna and a detachable external Set a TV antenna, the built-in microstrip antenna and the external TV antenna are connected to the receiving demodulation chip by multiplexing a high-frequency socket; mobile digital TV signals pass through the built-in microstrip antenna or the external TV The antenna receives it and sends it to the receiving demodulation chip, and the receiving demodulation chip completes the demodulation and decoding processing of the signal, and then sends the processed signal to the portable terminal through the interface circuit.

Further, the system further includes a data storage chip, and the data storage chip is connected to the receiving demodulation chip through a serial peripheral device interface.

Further, the receiving and demodulating chip is further composed of a filtering network, a tuning module, and a demodulating module, and the mobile digital TV signal received by the built-in microstrip antenna or the external TV antenna is filtered by the filtering module Afterwards, demodulation and decoding processing are performed through the tuning module and the demodulation module in sequence, and the processed signal is sent to the portable terminal by the demodulation module through the interface circuit.

Further, the system further includes a power circuit, and the power circuit is respectively connected to the interface circuit and the receiving demodulation chip through a power interface.

Further, the system further includes a power supply circuit, and the power supply circuit is respectively connected to the interface circuit, the receiving demodulation chip and the data storage chip through a power supply interface.

Further, the system further includes a reference clock connected to the receiving demodulation chip, for providing a local clock signal for the receiving demodulation chip.

Compared with the existing digital mobile TV terminal receiving system, the utility model has the advantages that the receiving system of the utility model uses a portable data card as a carrier, and improves the signal receiving capability of the terminal by means of a detachable external TV antenna , which broadens the coverage of mobile digital TV signals—it can reach deep indoor areas; at the same time, combined with personal computers and other mobile portable terminals equipped with application processors, users can enjoy both outdoor mobile environments and indoor fixed locations. High-definition display images and high-quality sound effects improve the user's listening experience, create market application space for mobile TV services, and promote the development of mobile digital TV.

Description of drawings

Fig. 1 is a composition schematic diagram of a terminal system of a cable digital TV home user;

Fig. 2 is the schematic diagram of mobile digital television signal mobile receiving system of the utility model;

Fig. 3 is the schematic diagram of the mobile receiving system of the utility model utilizing an external TV antenna to cooperatively receive mobile digital TV signals in an indoor deep environment;

Fig. 4 is a schematic diagram of a mobile receiving system for cooperatively receiving mobile digital TV signals using a built-in microstrip antenna in an open outdoor environment according to the present invention.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

As shown in Figure 2, the mobile digital TV signal mobile receiving system of the present utility model mainly includes: antenna device, reference clock 104, receiving demodulation chip 105, data storage chip 106, interface circuit 107, power supply circuit 108 and portable terminal 109 . Described antenna device comprises built-in microstrip antenna 101 and detachable external TV antenna 102, both are connected with receiving demodulation chip 105 by multiplexing a high-frequency socket 103; Line peripheral device interface) interface is connected with receiving demodulation chip 105; Reference clock 104 is connected with the appointed pin of receiving demodulation chip 105; 105 . The data storage chip 106 is connected; the receiving demodulation chip 105 is connected to the portable terminal 109 through the interface circuit 107 . Among them, the functions of each part are as follows:

A built-in microstrip antenna 101 is used for receiving mobile digital TV signals in a mobile environment, such as outdoors;

An external TV antenna 102 is used to receive mobile digital TV signals in a relatively closed room or in a deep room away from windows;

A high-frequency socket 103 is used to provide a connection interface between the built-in microstrip antenna 101 and the external TV antenna 102 and the receiving demodulation chip 105;

The reference clock 104 is used to provide the local clock signal for the demodulation chip 105;

The receiving demodulation chip 105 is further composed of a filter network, a tuning module, and a demodulation module, and performs demodulation and decoding processing after filtering the received mobile TV signal;

The data storage chip 106 is used to store the start-up program and initialization parameters of the receiving demodulation chip 105, and guide the receiving demodulation chip 105 to enter the normal working mode after reset;

Interface circuit 107, comprises the interface circuit of the form such as USB, is used for outputting the digital signal processed by receiving demodulation chip 105 to peripheral portable terminal 109, as personal computer etc.; The user instruction is transmitted to the receiving demodulation chip 105, and the receiving demodulation chip 105 interprets the user instruction, changes the receiving frequency to the corresponding frequency point and enters the corresponding working state;

The power supply circuit 108 is used to convert the external power supply into the voltage required by the interface circuit 107, the receiving demodulation chip 105 and the data storage chip 106;

The portable terminal 109, such as a personal computer, is used to process the received digital mobile TV signal through the application program, complete the data decompression work, and display it on the display at the same time.

The work flow of the mobile digital television signal mobile receiving system of the present utility model comprises the following steps:

Step A, the power supply circuit 108 takes power through the external interface, and outputs three voltages of VCC1, VCC2, and VCC3 to send to the corresponding receiving demodulation chip 105, data storage chip 106 and interface circuit 107;

Step B, after the power supply is normal, the receiving demodulation chip 105 is reset;

Step C, the data storage chip 106 downloads the initialization program and startup program stored therein to the receiving demodulation chip 105 through the SPI interface, so that it enters a normal working state;

Step D, when the user is located in a relatively closed room or away from the window, connect the external TV antenna 102 to the high-frequency socket 103, and the mobile digital TV signal passes through the external TV antenna 102 and enters the receiving demodulation through the high-frequency socket 103 The chip 105 is sent to the interface circuit 107 after receiving and demodulating the chip 105 to complete the demodulation and decoding of the signal;

And when the user is located in the open outdoors or indoors close to the window, the external TV antenna 102 connected to the high-frequency socket can be disassembled, and the microstrip built-in antenna 101 integrated in the receiving system can be used to receive mobile digital signals;

Step E, the portable terminal 109 obtains the decoded video signal through the interface circuit 107 and sends it to the corresponding internal application program for decompression processing, and displays it on the display after the processing is completed.

The actual operation of the mobile digital TV signal mobile receiving system of the present invention will be further introduced in detail in combination with two application examples below.

Application example 1: An example of a mobile receiving system for receiving CMMB (China Mobile Multimedia Broadcasting, China Mobile Multimedia Broadcasting) mobile digital TV signals in an indoor deep environment using an external antenna cooperatively

As shown in FIG. 3 , when the user is located deep in the room, the external TV antenna 102 is connected to the high-frequency socket 103 of the data card. Use an external power supply to supply power to the power supply circuit 108, and the power supply circuit 108 converts the input voltage to the required voltage VCC1, VCC2, VCC3, and transmits them to the receiving demodulation chip 105, the data storage chip 106 and the interface circuit 107 through corresponding pins . When the power supply voltage is stable, the receiving demodulation chip 105 is reset. Next, the data storage chip 106 initializes the receiving demodulation chip 105 and guides it into a normal working mode. Now if the user watches a set of CCTV programs, the user instruction is sent by the application program of the portable terminal 109, and the user instruction is passed to the receiving demodulation chip circuit 105 by the interface circuit 107 (such as a USB interface), and the receiving demodulation chip circuit 105 is interpreted. User command, change its receiving frequency to the frequency point of CCTV set and enter the corresponding working state. At this time, the external TV antenna 102 transmits the received CCTV set program to the receiving demodulation chip 105 through the high-frequency socket 103, when After demodulation and decoding of the signal by the receiving demodulation chip 105, it is sent to the portable terminal 109 by the interface circuit 107 (such as a USB interface), and the portable terminal 109 completes the data decompression work through its application program, and finally displays the TV signal on the display , so the user can watch a set of CCTV programs they want.

Application example 2: An example of a mobile receiving system that uses a built-in microstrip antenna to cooperatively receive CMMB mobile digital TV signals in an open outdoor environment

As shown in FIG. 4 , when the user is in an open outdoor environment, the detachable external TV antenna 102 can be removed, and the built-in microstrip antenna 101 integrated in the TV card can be used to receive mobile digital signals. The external power supply supplies power to the power circuit 108, and the power circuit 108 converts the input voltage to the required voltages VCC1, VCC2, and VCC3, and transmits them to the data receiving and demodulating chip 105, the data storage chip 106, and the interface circuit 107 through corresponding pins. . When the power supply voltage is stable, the receiving demodulation chip 105 is reset. Next, the data storage chip 106 initializes the receiving demodulation chip 105 and guides it into a normal working mode. Now if the user watches a TV program of CCTV, the application program of the portable terminal sends an instruction, and the instruction is sent to the receiving demodulation chip 105 by the interface circuit 107 (such as the USB interface circuit), and the receiving demodulation chip 105 interprets the user instruction, Change its receiving frequency to the frequency point of the CCTV set and enter the corresponding working state, and at the same time adjust the resonance point of the built-in microstrip antenna 101 to the frequency point of the CCTV set. Now the built-in microstrip antenna 101 transmits a set of programs received by CCTV to the receiving demodulation chip 105 through the high-frequency socket 103. interface) to the portable terminal 109, and the portable terminal 109 completes the data decompression work by its application program, and finally presents the TV signal on the display, so that the user can see a set of CCTV TV programs selected.

Claims (6)

1, the removable receiving system of a kind of mobile digital TV signals is characterized in that, comprises antenna assembly, receiving demodulation chip, interface circuit and portable terminal; Described antenna assembly comprises built-in microstrip antenna and dismountable external television antenna, and described built-in microstrip antenna is connected with described receiving demodulation chip by a multiplexing high-frequency socket with described external television antenna; Mobile digital TV signals is delivered to described receiving demodulation chip after described built-in microstrip antenna or described external television antenna reception, after described receiving demodulation chip is finished the demodulation, decoding processing of signal, the signal after handling is delivered to described portable terminal through described interface circuit.

2, the system as claimed in claim 1 is characterized in that, described system also comprises pin-saving chip, and described pin-saving chip links to each other with described receiving demodulation chip by Serial Peripheral Interface.

3, the system as claimed in claim 1, it is characterized in that, described receiving demodulation chip further is made up of filter network, tuner module, demodulation module, after the mobile digital TV signals that described built-in microstrip antenna or described external television antenna receive is carried out Filtering Processing through described filtration module, carry out demodulation, decoding processing through described tuner module and described demodulation module successively, the signal after the processing is delivered to described portable terminal by described demodulation module through described interface circuit.

4, as claim 1 or 3 described systems, it is characterized in that described system also comprises power circuit, described power circuit links to each other with described interface circuit and described receiving demodulation chip respectively by power interface.

5, system as claimed in claim 2 is characterized in that, described system also comprises power circuit, and described power circuit links to each other with described interface circuit, described receiving demodulation chip and described pin-saving chip respectively by power interface.

6, system as claimed in claim 4 is characterized in that, described system also comprises the reference clock that links to each other with described receiving demodulation chip, is used to described receiving demodulation chip that the local clock signal is provided.

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