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).[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 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 their 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]
Coverageedit
China Satellite Mobile Broadcasting Corporation (CSMBC), as of 2 June 2010, had completed CMMB network coverage in 317 prefecture-level cities.[9]
Versus DTMBedit
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.
The CMMB is intended for use on small screen devices (such as GPS, PDA, or 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.
china, multimedia, mobile, broadcasting, china, mobile, multimedia, broadcasting, cmmb, mobile, television, multimedia, standard, developed, specified, china, state, administration, radio, film, television, sarft, based, satellite, terrestrial, interactive, mu. 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 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 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 their hardware platform supporting both CMMB and DTMB as well as others standard waveforms Contents 1 RF Details 2 Coverage 3 Versus DTMB 4 See also 5 References 6 External linksRF Details editCMMB 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 Coverage editChina Satellite Mobile Broadcasting Corporation CSMBC as of 2 June 2010 had completed CMMB network coverage in 317 prefecture level cities 9 Versus DTMB editThe 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 The CMMB is intended for use on small screen devices such as GPS PDA or 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 editDTMB Digital Multimedia Broadcasting DVB Digital Video Broadcasting DVB T Digital Video Broadcasting Terrestrial DVB H Digital Video Broadcasting Handheld International standardReferences edit a b China releases mobile TV industrial standard Press release Interfax China 2006 10 25 Retrieved 2007 04 14 TiMi Technologies Co Ltd Academy of Broadcasting Science 2008 01 31 Archived from the original on 2009 02 25 Retrieved 2008 06 08 a b c Mike Clendenin 2006 12 18 China s mobile TV spec similar to Europe s EETimes Retrieved 2007 04 14 China releases first mobile TV chip based on CMMB standard SARFT official Press release Interfax China 2007 03 28 Retrieved 2007 04 14 Cai Yan 2007 03 29 Chip supports China s CMMB mobile TV EETimes Retrieved 2007 04 14 Rohde amp Schwarz CMMB Information Retrieved 2010 01 29 Siano SMS1186 PDF Retrieved 2010 01 29 Rohde amp Schwarz Test signals for the new CMMB and DVB SH mobile TV systems PDF Retrieved 2010 01 29 开通CMMB的317个城市及频道列表 中广互联 SARFT net 中国广电第一门户 数字电视行业第一门户 Archived from the original on 2010 06 14 Retrieved 2010 06 21 External links editIEEE Spectrum Article https archive today 20130116033332 http www cbc cn Chinese Unique Broadband Systems Retrieved from https en wikipedia org w index php title China Multimedia Mobile Broadcasting amp oldid 1116803729, wikipedia, wiki, book, books, library,
