Label: CMMB TV Receiver Module
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Among the many Chinese mobile TV candidate standards, the CMMB standard for portable terminal applications with small screens of seven inches or less, such as mobile phones, PDAs, PNDs, MP3s, MP4s, digital cameras, notebook computers, etc., proposed by the Broadcasting Science Research Institute of the State Administration of Radio, Film and Television With its high speed, low power consumption and high mobility, it is supported by many equipment manufacturers and terminal manufacturers.
The CMMB technology system utilizes high-power S-band satellite signals to cover the whole country, and uses the ground-increasing transponder to transmit satellite signals with the same content at the same time, supplement the satellite signal blind zone, and construct a return channel by using the wireless mobile communication network to form a one-way broadcast. A mobile multimedia broadcast network combined with two-way interaction. The CMMB architecture is shown in Figure 1.
The terminals of CMMB will be diverse. If many types of terminals have to design their own mobile TV receivers and software, they will require a lot of work for many mobile TV professionals and delay the time to market. In order to speed up the time to market and reduce product design risks, you can consider purchasing a commercial modular receiver module directly.
Figure 1: CMMB architecture diagram
Shijian system designed the CMMB receiver module based on ADI's tuner ADMTV102 and Telepath Technology's demodulator TP3001B. Figure 2 shows the block diagram and system application block diagram.
Figure 2: Block diagram and application diagram of CMMB module of ADI-based tuner ADMTV102 and Taihe Zhiheng demodulator TP3001B
Taihe Zhiheng is one of the major CMMB demodulator providers. It is a manufacturer specializing in the production of CMMB terminal demodulator chips funded by Taimei Century Technology Co., Ltd. Taimei Century is the owner of the CMMB standard, so Taihe Zhiheng's demodulator has many advantages, including small size, low power consumption, hardware demultiplexing, simple back-end integration, and low AV demodulator requirements.
ADI is one of the leading providers of mobile portable TV tuners. In addition to providing tuners that support the CMMB standard, ADI also offers tuners that support a variety of other mobile TV standards. ADMTV102 can support multiple standards and is adopted by many manufacturers with its superior performance in low power consumption, high sensitivity and high dynamic range.
The antenna of the CMMB module receives the CMMB television signal and, after processing, outputs a standard MFS stream to the backend AV decoder. The MFS stream output adopts SDIO or SPI mode, and the external interface is simple, and can support multiple decoders.
This CMMB module has the following performance characteristics: full compliance with CMMB industry standards GY/T220.1-2006 and GY/T220.2-2006; support for 8MHz bandwidth and BPSK/QPSK/16QAM modulation mode; built-in CPU for flexible configuration; internal solution Multiplexing function; support 2 logical channels at the same time; provide SPI/SDIO interface MSF data output format, easy to integrate into mobile phones or other mobile TV products; provide middleware software such as Demux and ESG independent of operating platform, easy to transplant Low power consumption, small size, can be directly embedded as a module into a variety of portable products such as mobile phones; the front end has a trap to solve the problem of co-location of TV and mobile phone.
Figure 3: Product diagram of the CMMB module
The above features of the CMMB module make it suitable for use in a variety of applications such as PND, PDA, PMP, mobile phones, car TV and USB Dongle. Direct use of the module will greatly reduce the time to market for CMMB mobile TV. As an agent of ADI and Taihe Zhiheng, Shijian System focuses on the mobile and portable products market. In addition to providing basic chip supply services, it also provides value-added services similar to CMMB module design, including CMMB module solutions and portable TVs and mobile phones. A complete solution for TV.
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