| List ofdigital television broadcast standards |
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| DVB standards(countries) |
| ATSC standards(countries) |
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| ISDB standards(countries) |
| DTMB standards(countries) |
| DMB standard(countries) |
| Codecs |
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| TerrestrialFrequency bands |
| SatelliteFrequency bands |
China Mobile Multimedia Broadcasting (CMMB) is a mobile television and multimedia standard developed and specified inChina by theState Administration of Radio, Film, and Television (SARFT).[1] It is based on theSatellite and Terrestrial Interactive Multiservice Infrastructure (STiMi), developed by TiMiTech, a company formed by the Chinese Academy of Broadcasting Science.[2][3] Announced in October 2006,[1] it has been described as being similar to Europe'sDVB-SH standard for digital video broadcast from bothsatellites and terrestrial repeaters to handheld devices.[3]
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.[3] Multiple companies have chips that support CMMB standard - Innofidei who was the first with a solution 28 March 2007.[4][5]
Other manufacturers, such as Unique Broadband Systems, were quick to enter the race and grab a share of the handheld broadcasting market with theirhardware platform supporting both CMMB and DTMB (as well as others) standard waveforms.
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.[6][7] The channel bandwidth can be either 2 or 8 MHz, depending on data rate.[8]
China Satellite Mobile Broadcasting Corporation (CSMBC), as of 2 June 2010, had completed CMMB network coverage in 317prefecture-level cities.[9]
