China Multimedia Mobile Broadcasting

China Multimedia Mobile Broadcasting (CMMB) is a mobile television and multimedia standard developed and specified in China by the State Administration of Radio, Film, and Television (SARFT).^[1] 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.^[2][3] Announced in October 2006,^[1] it has been described as being similar to Europe's DVB-SH standard for digital video broadcast from both satellites and terrestrial 'gap fillers' to handheld devices.^[3]

It specifies usage of the 2.6 GHz frequency 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 March 28, 2007, Siano Mobile Silicon(with the SMS118x chip family, which support diversity and have superb performance) and more .^[4][5]

Coverage

China Satellite Mobile Broadcasting Corporation (CSMBC) , as of 19 January 2009, had completed CMMB network coverage in 113 prefecture-level cities.^[6]

Versus DTMB

• The CMMB is not a chinese national standard(GB), but the DTMB is GB 20600-2006.
• The CMMB uses QCIF or QVGA , so can not broadcast the HDTV(1080i/1080p), but the DTMB can do.
• The CMMB is intended for use on small screen devices (such as GPS,PDA,smartphone...) in a mobile scenario, while DTMB is intended for use on large screen devices (such as PC, LCD TV , PDP TV...) in a fixed scenario.

See also

• DTMB
• Digital Multimedia Broadcasting
• DVB (Digital Video Broadcasting)
• DVB-T (Digital Video Broadcasting - Terrestrial)
• DVB-H (Digital Video Broadcasting - Handheld)
• International standard

References

1. ^ ^{a b} Interfax China (2006-10-25). "China releases mobile TV industrial standard". Press release. http://www.interfax.cn/displayarticle.asp?aid=18260&slug=MOBILE%20TV. Retrieved 2007-04-14. 
2. ^ "TiMi Technologies Co. Ltd.". Academy of Broadcasting Sciece. 2008-01-31. http://www.abs.ac.cn/en/Orgnization/Enterprises/200801/t20080131_2103.htm. Retrieved 2008-06-08. 
3. ^ ^{a b c} Mike Clendenin (2006-12-18). "China's mobile-TV spec similar to Europe's". EETimes. http://www.eetimes.com/showArticle.jhtml;?articleID=196604027. Retrieved 2007-04-14. 
4. ^ Interfax China (2007-03-28). "China releases first mobile TV chip based on CMMB standard - SARFT official". Press release. http://www.interfax.cn/displayarticle.asp?aid=22689&slug=CHINA-TELECOM-MOBILE. Retrieved 2007-04-14. 
5. ^ Cai Yan (2007-03-29). "Chip supports China's CMMB mobile TV". EETimes. http://www.eetimes.com/news/semi/showArticle.jhtml?articleID=198700962. Retrieved 2007-04-14. 
6. ^ 150 Cities Complete CMMB Network Construction

External links

• IEEE Spectrum Article
• http://www.cmmb.org.cn/ (Chinese)
• http://www.siano-ms.com Siano Mobile Silicon
• http://www.teamcast.com TEAMCAST

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