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China Multimedia Mobile Broadcasting
China Mobile Multimedia Broadcasting (CMMB) is a mobile television and multimedia standard developed and specified in China by the State Administration of Radio, Film, and Television (SARFT). It is based on the Satellite and Terrestrial Interactive Multiservice Infrastructure (STiMi), developed by TiMiTech, a company formed by the Chinese Academy of Broadcasting Science. Announced in October 2006,〔 it has been described as being similar to Europe's DVB-SH standard for digital video broadcast from both satellites and terrestrial repeaters to handheld devices.〔
It specifies usage of the S-band/U-band and occupies 25 MHz bandwidth within which it provides 25 video and 30 radio channels with some additional data channels.〔 Multiple companies have chips that support CMMB standard - Innofidei who was the first with a solution March 28, 2007,
Other manufacturers, such as (Unique Broadband Systems ), were quick to enter the race and grab a share of the handheld broadcasting market with their (hardware platform ) supporting both CMMB and DTMB (as well as others) standard waveforms.
== RF Details ==
CMMB uses frequencies in the range 2635 - 2660 MHz (S-band) for satellite and "gap-filler" terrestrial broadcast, with additional terrestrial broadcast in the UHF band 470 – 862 MHz. The channel bandwidth can be either 2 or 8 MHz, depending on data rate.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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