In today's world, China Multimedia Mobile Broadcasting is a topic that has taken on great relevance in different areas and sectors. Its impact has spread to society, the economy, politics and culture, generating interest and debate around the world. From its origins to its contemporary evolution, China Multimedia Mobile Broadcasting has been the subject of study and analysis by experts and academics, who seek to understand its influence on daily life and the development of new paradigms. In this article, we will explore different perspectives and approaches on China Multimedia Mobile Broadcasting, in order to offer a comprehensive and updated vision of this phenomenon that continues to set the standard today.
List of digital 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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Terrestrial Frequency bands |
Satellite Frequency bands |
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 28 March 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.
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.
China Satellite Mobile Broadcasting Corporation (CSMBC), as of 2 June 2010, had completed CMMB network coverage in 317 prefecture-level cities.