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Semaphore Signal

Domestic Chip Based On Terrestrial Digital Tv Set

Abstract: This paper describes a chip-based domestic terrestrial transmission Digital TV STB Design and use of Legend Silicon's demodulation chip, jointly developed Tsinghua University LG S8813 and Haier Hi2011e DMB-TH decoder chip solution, the paper describes the specific hardware implementation and software architecture.

  Key words: digital Television Top box; DMB-TH; TDS-OFDM

Introduction Terrestrial digital TV transmission is the most basic standard, terrestrial television Broadcasting Most Public Of the media. Tsinghua University proposed DMB-T (terrestrial digital Multimedia / Broadcasting) transmission scheme, the technical feasibility, system stability, industrialization, the feasibility of such operations has been able to satisfy the requirements of terrestrial digital TV standard, and began to promote the spread at home.

This article describes a DMB-TH (terrestrial digital TV receiver set-top box) solutions. The program, source demodulation using the Legend Silicon Corporation and Tsinghua University jointly developed TDS-OFDM (time domain synchronous orthogonal frequency division multiplexing) demodulator chip LGS8813, source decoder uses the Beijing Haier IC Development of M Design Limited PE G-2 decoder chip Hi2011e, is the first full use of domestic digital TV chip for DMB-TH STB design.

System hardware design The digital TV set-top box solutions for major hardware Package Include: digital tuner, DMB-TH demodulator, MPEG-2 source decoder. System block diagram in Figure 1.

Figure 1 Block diagram of system hardware

Digital tuner with the Sharp to support the development of DMB-TH VA1T1ED6060. The reception frequency range 426MHz-862MHz, high-frequency head will Antenna To receive the terrestrial signal gain control circuit through an internal transformation, the output IF frequency analog signals. LNB output by A / D converter (AD9203) the IF analog signal into digital signal IF.

LGS8813 achieved by the source modem. This is a TDS-OFDM demodulator chip, full support for DMB-TH terrestrial transmission standard, after the IF digital signal demodulation output 8-bit parallel digital transport stream, that is, TS (transportstream) flow. LGS8813 need a 64Mb of SDRAM as workspace.

Source decoder to achieve by the Haier Hi2011e their works:

Read digital transport stream decoder chip, through hardware demultiplexing, audio and video out of the basic flow solution, stored in the chip SDRAM. Video decoding module from Video Compression Remove the compressed data in the data area, after variable length decoding, inverse quantization, inverse discrete cosine transform, motion compensation, data consolidation, resulting in the video image data stored in the video image data buffer. Play the video image data from the buffer module, remove the video image data, and menu display OSD (OnScreenDisplay) data aliasing the output video image. Hi2011e video output with digital mode and analog mode. Digital video output to YCbCr, 4:2:2 model, YUV output, consistent with IT U-656 standard, can be connected with the ITU-656 interface devices or equipment, such as liquid crystal display driver circuit; analog video output support CVBS, S-VIDEO, YPbPr. Hi2011e audio decoding compressed audio data from the compressed data buffer out, after decoding, sub-band filtering, generate audio PCM Data stored in the audio PCM data buffer, the play module audio PCM data from the audio PCM data out buffer, and then send the audio PCM audio interface according to the data. External HT82V731 DAC PCM audio data into analog audio signals.

Hi2011e an 8-bit internal CPU Responsible for system control, including control of the external circuit, TS stream demultiplexing control, OSD control, and run the digital TV-related applications.

The system provides a IC Card interface, can support the requirements and accept CA system . There are also RS-232C interface can be through the serial port on the system software upgrade. The entire system through the major components Phili ps Development of the I2C bus to communicate.

System software Figure 2 shows the schematic set-top box software structure.

Figure 2 Schematic diagram of system software for set-top box

Integrated software development tools for the KEIL's mVision2, this is a very wide range of C51 application development tools. Integrated Development Environment includes: compiler, assembler, real time Operating system , Project Manager, cross debugger. KEIL standard C compiler can use all of the code ANSI C-language, it has good portability. uVision2 chip memory can generate the necessary connection options: to determine the starting address and size of the generated code to download the Flash to the set-top box (Figure 1), and run directly from Flash.

Set-top box operating system for embedded real time operating system mC / OS, which is a portable, can be cured, can be cut and can be deprived of their type of multi-tasking real-time kernel. Based mC / OS set-top box software platform multi-task mechanism, functions include: Digital TV's basic agreement, such as the 13818 system protocol, demultiplexing agreements; external control circuit, decoding, digital television broadcast; provide conditional access graft function of the system and mechanism; provide convenient custom personalized interface; can personalize the application to extend its functions and mechanisms. Software platform to achieve by the modular structure of the program, each module uses a message queue between Communication .

Platform, the main module are: Init modules: initialization of all hardware, set up all semaphores, queues, events, messages, tasks, deal with I2C driver to deal with the state of tuner operation.

Port processing module: interrupt-based mechanism for hardware system, organization, management, interrupt handling various types, to analyze the state of suspended equipment, may be called interrupt handling module. Port-based search mechanism for the hardware system wheel, wheel to find the hardware status, you can find the module known as the port wheel.

Demultiplexing modules: processing TSD channel Filter Device, buffer management, including setting PID, solution PA T Table , PMT table, SDT, etc.; set the filter conditions; Management channel buffer; for CRC verification.

Descrambling module

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