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| TI 机顶盒解决方案 | |||||
作者：TI 文章来源：本站 点击数： 更新时间：2007-3-18  |
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The Set-Top-Box is a video/audio subsystem that supports digital/analog video broadcasting (cable, satellite, terrestrial) Block Diagram  Design Considerations As the cable television and satellite television industries enjoy another year of sustained growth, many cable/satellite operators are continuing to invest in the digitalization of their systems. This is resulting in the transition of the TV transmission infrastructure from an analog environment to a digital one. Once a cable/satellite system has made the transition, subscribers have access to an increased number of video channels, high speed Internet service, and even telephony voice service. The set-top box market, which is a key part of this digital upgrade, is benefiting from this evolution. When designing the next set-top box platform, there is no need to shop around for video components. TI offers a complete range of video solutions to meet the specific needs of the new digital set-top box. TI covers the entire signal chain, with the THS8200. This is an all-format component video back end with color space conversion and automatic sync insertion. It can process all SDTV and HDTV formats. A Set Top Box system would include: DSP - performs MPEG encoder/decoder, and voice/AC3/MPEG audio processing. RF Demodulation - performs COFDM/QAM/QPSK demodulation, Forward Error Correction (FEC) and video mux. MCU - controls system electronic, network, and user interface. Memory - stores executing code and data/parameters. Video Interface - selects video source to be decoded/encoded by ADC/DAC and DSP. Both the video front end and output stages require high-performance op-amps to amplify the video signal. Audio Interface - allows audio to be digitized by the audio codec and processed by DSP to provide high-quality audio for MPEG/AC3 requirements. User Interface - allows the user to communicate with system network, control video/audio I/O sources, and perform voice/data communication. Broadband & Wireless Connectivity - allows interactive TV, gaming, streaming audio and video, voice over IP (VoIP), and video telephony to transmit and receive through ADSL, cable modem, and 802.11 interface. Power Conversion - converts the input power from the AC adaptor to run various functional blocks. Application Notes High Resolution Video Using the DM642 DSP and the THS8200 Driver (Rev. A) (spra961a.htm, 10 KB) 03 May 2004 Abstract Interfacing an LCD Controller to a DM642 Video Port (Rev. B) (spra975b.htm, 10 KB) 03 May 2004 Abstract |
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