CN201039303Y - Wireless digital STB - Google Patents

Abstract

The utility model provides a radio digital set-top box, which comprises a digital high-frequency head, an AD conversion module, a demodulation module, a microcontroller unit and a decoding module. A received signal undergoes tuning, AD conversion and DMB-TH information source demodulation, and then a transmission code stream is obtained; after that, the microcontroller unit calls the decoding module to process and then outputs video and audio; wherein, the radio digital set-top box also comprises an antenna, and the digital high-frequency head receives the received signal through the antenna; moreover, the demodulation module is a DMB-TH demodulation module and used for demodulating the digital signal coded by the DMB-TH information source to a transmission code stream; and the decoding module is an MPEG 2 decoding module. By adopting the technical proposal, without changing the television, the user can receive the digital broadcast signal through the radio digital set-top box, thereby solving the transition from sn analog television to a digital television, and especially being applicable to receiving a television signal for the users in the country without a digital television line.

Description

A wireless digital set-top box

technical field

The utility model relates to a wireless digital set-top box, in particular to a wireless digital set-top box conforming to the national digital broadcasting and television signal standard DMB-TH.

Background technique

At this stage, the digital set-top boxes we use all receive digital signals that support foreign standards, and they are only implemented in a few cities; moreover, in the vast rural areas, they still mainly receive wireless signals. With the promulgation and implementation of the national digital broadcast TV signal standard DMB-TH, the problem of TV signal reception in the vast rural areas must be faced and solved, but there are no related products that can solve this problem.

Therefore, there are defects in the prior art and need to be improved.

Utility model content

The purpose of the utility model is to provide a wireless digital set-top box capable of receiving wireless digital TV signals.

The technical scheme of the utility model is as follows:

A wireless digital set-top box, which includes a digital tuner, an AD conversion module, a demodulation module, a microcontroller unit, and a decoding module; the received signal is tuned, converted from analog to digital, and demodulated by a DMB-TH source to obtain a transmission code stream , calling the decoding module by the micro-controller unit to perform video and audio output after processing; wherein, the wireless digital set-top box also includes an antenna, and the digital tuner receives the received signal through the antenna; and, the demodulation The module is a DMB-TH demodulation module, which is used to demodulate the digital signal encoded by the DMB-TH source into a transmission code stream; the decoding module is an MPEG2 decoding module.

In the wireless digital set-top box, the demodulation module further includes a first synchronous dynamic memory.

In the wireless digital set-top box, the capacity of the first synchronous dynamic memory is at least 64M bits.

In the wireless digital set-top box, the capacity of the first synchronous dynamic memory is at least 256M bits.

In the wireless digital set-top box, the decoding module further includes a second synchronous dynamic memory.

The wireless digital set-top box further includes an input module and a control module; the user inputs instructions through the input module, and the control module controls the wireless digital set-top box to execute the instructions.

Adopting the above scheme, the utility model provides a wireless digital set-top box, the user can receive the digital broadcast signal through the wireless digital set-top box without changing the TV set, thereby solving the transition from analog TV to digital TV, especially suitable for Rural users who have laid digital TV lines receive TV signals.

Description of drawings

Fig. 1 is the embodiment schematic diagram of the present utility model;

FIG. 2 is a schematic diagram of an application platform of an embodiment of the present invention.

Detailed ways

Preferred embodiments of the present utility model are described in detail below.

As shown in Figure 1, the utility model provides a kind of wireless digital set-top box, and it comprises digital tuner, AD conversion module, demodulation module, microcontroller unit, decoding module; Wherein, described wireless digital set-top box also comprises antenna , the digital tuner receives the received signal through the antenna; and, the demodulation module is a DMB-TH demodulation module, which is used to demodulate the digital signal encoded by the DMB-TH source into a transmission code stream ; The decoding module is an MPEG2 decoding module. The received signal received from the antenna is tuned by the digital tuner, the AD conversion module performs analog-to-digital conversion, and the DMB-TH demodulation module performs DMB-TH source demodulation to obtain the transmission code stream (TS, TransportStream), and then the micro The controller unit calls the decoding module for video and audio output after processing.

The digital tuner can be VA1T1ED6060 developed by Sharp Corporation to support DMB-TH. Its receiving frequency range is 426MHz-862MHz. The tuner transforms the ground transmission signal received by the antenna through internal gain and other circuits, and outputs IF intermediate frequency analog signal. The output of the tuner converts the intermediate frequency analog signal into an intermediate frequency digital signal through an AD conversion module, that is, an AD conversion circuit, such as AD9203 of ADI Company.

The demodulation module can be the LGS8913 of Lingxun Technology, which is a demodulation chip of time-domain orthogonal frequency division multiplexing digital transmission technology (TDS-OFDM), fully supports the DMB-TH terrestrial transmission standard, and converts the intermediate frequency digital signal After demodulation, an 8-bit parallel digital transport stream, namely TS stream, is output. The demodulation module also includes a first synchronous dynamic memory (SDRAM), and the capacity of the first synchronous dynamic memory can be at least 64M bits (bit), which is used as the working space of the demodulation module. For example, the LGS8913 needs a 64Mbit SDRAM as its working space.

Wherein, the capacity of the first synchronous dynamic memory may be at least 256Mbit, which is helpful to improve the relative performance of the demodulation module.

The wireless digital set-top box, wherein, the decoding module further includes a second synchronous dynamic memory, and the decoding module may also include Flash flash memory and the like. The utility model does not make additional restrictions to this.

The microcontroller unit may be an MCU (microchip) or a CPU (central processing unit); the microcontroller unit and the decoding module may also be integrated into a decoding chip. The utility model does not make additional restrictions on this.

The MPEG2 decoding module may use an MPEG2 decoding chip to complete audio decoding and video decoding functions. For example, the MPEG2 decoding chip can be the ALI3330E of ALI Company or the AML7218 chip of Amlogic Company, etc., as long as it can realize the MPEG2 decoding function, the utility model does not impose additional restrictions on this.

The decoding chip reads the TS stream, demultiplexes the audio and video stream through hardware, and stores it in the off-chip SDRAM. The decoding module takes out the compressed data from the video compressed data area, undergoes variable length code decoding, inverse quantization, inverse cosine transformation, motion compensation, and data merging to generate video image data, which is stored in the video image data buffer. The playback module takes out the video image data from the video image data buffer, and outputs the video image after aliasing with the menu display OSD (On Screen Display) data. If ALI3330E is used, its video output is analog, and the analog video output can support CVBS, S-VIDEO, VGA, YCbCr, etc.

The wireless digital set-top box may further include an input module and a control module; the user inputs instructions through the input module, and the control module controls the wireless digital set-top box to execute the instructions. It may also include a storage module for storing some setting information, which is also input and set by the user through the input module, including video input control, volume control and so on. It may also include a graphical user interface, displaying the setting information or the instruction on the graphical user interface, so that the user can see the setting information or the instruction input by himself.

Cygwin software can be used to develop the software operating system of the wireless digital set-top box described in the utility model, and the Cygwin software can be applied to the current popular WINDOWS platform, and can compile and generate ELF format programs.

The operating system of the set-top box is an embedded real-time operating system, which is a portable, curable, tailorable and deprivable multi-task real-time kernel. The software operating system can adopt a multi-task mechanism, which can realize the following functions: multi-task management, synchronous processing, message dispatching, etc.

An application platform of a specific application example is shown in FIG. 2 , which includes a man-machine exchange program (UI), application programs, device drivers, operating systems and hardware platforms.

Device driver: used to manage platform hardware and provide a simple interface for other modules to use. Such as Flash, demodulator, and Panel drivers.

Operating system: provides memory management, task management, message management, synchronization mechanism, device management, etc., and is the basis of the entire set-top box software.

The hardware platform includes communication module, decoding module and so on.

Communication module: including tuner (Tuner), demodulator (Demodulator), data multiplexing (DMX) sub-modules, these modules demodulate high-frequency analog signals through analog-to-digital conversion, and finally demodulate TS codes flow.

Decoding module: Decode the audio and video data decoded from DMX, and output the decoded audio and video to the TV for display through TV Encoder.

General middle layer: implement functions including channel changing, channel scanning, and signal quality monitoring.

The man-machine exchange program can be implemented through the GUI module, and through the interface provided by the OSD (On Screen Display, screen display) function, it can interact with the user, and the user can control the set-top box through the GUI module. Such as video input control, volume control, etc.

The application program can be implemented through the service information (SI, Service Information) application module, and the program association table (PAT, Program Association Table), program mapping table (PMT, Program Map Table), service description table (SDT) can be analyzed through user settings. , Service Description Table), time and date table (TDT, Time and Date Table), etc., to obtain the service information required by the user, such as TV program guide (EPG) information, program schedule, time information, etc.

The application program can also be implemented through the data management module, and save information when the user uses the set-top box into the flash through the interface provided by the Flash driver. Such information as program schedule, volume level, OSD language, etc.

The application program can also include a general-purpose middle layer to implement functions including channel changing, channel scanning, signal quality monitoring, etc.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should belong to the protection scope of the appended claims of the present utility model.

Claims (6)

1. wireless digital set-top box, it comprises digital tuner, AD modular converter, demodulation module, micro controller unit, decoder module; Received signal obtains transmission code stream after through tuning, analog-to-digital conversion, the demodulation of DMB-TH information source, is called by micro controller unit and carries out video and audio frequency output after decoder module is handled; It is characterized in that described wireless digital set-top box also comprises antenna, described digital tuner receives described received signal by described antenna; And described demodulation module is the DMB-TH demodulation module, and the digital demodulation signal that is used for the DMB-TH source encoding is a transmission code stream; Described decoder module is the MPEG2 decoder module.

2. wireless digital set-top box according to claim 1 is characterized in that described demodulation module also comprises first synchronous dynamic random access memory.

3. wireless digital set-top box according to claim 2 is characterized in that, the described first synchronous dynamic random access memory capacity is at least the 64M position.

4. wireless digital set-top box according to claim 3 is characterized in that, the described first synchronous dynamic random access memory capacity is at least the 256M position.

5. according to the arbitrary described wireless digital set-top box of claim 1 to 4, it is characterized in that described decoder module also comprises second synchronous dynamic random access memory.

6. wireless digital set-top box according to claim 1 is characterized in that it also comprises input module and control module; The user controls described wireless digital set-top box by described control module and carries out described instruction by described input module input instruction.

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