|ISDB-Tmm Adopted for Mobile Multimedia Broadcasting in Japan|
Posted: 26-Dec-2009 [Source: ]
[The ISDB-Tmm standard has been approved for use in Japan for mobile multimedia broadcasting.]
Tokyo -- ISDB-Tmm has been adopted as one of the standards for nationwide mobile multimedia broadcasting in Japan. Broadcasting using this standard is scheduled to start after July 24, 2011, when analog TV broadcasting will be closed down. ISDB-Tmm belongs to the ISDB-T family of technologies, and has been developed based on the same technology as ISDB-T. This technology is being actively promoted by the ISDB-T Forum, a group made up of approximately 80 Japanese corporations, and thus it is almost certain that the use of ISDB-Tmm technology for broadcasting will become a reality.
In addition to ISDB-Tmm, other standards adopted for multimedia broadcasting include ISDB-Tsb and MediaFLO. Broadcasters will choose one of the standards when they apply for a license. ISDB-Tmm eliminates the need for a guard band by combining some blocks of 13 segments (5.6 MHz) and several 1-segment formats (1 segment = 0.4 MHz), and can be applied to various frequency bands. A transmitter for a combination of 33 segments (14.2 MHz) has already been developed, allowing a significant reduction in transmission costs. As is clearly shown above, the versatility of ISDB-Tmm enables it to be applied to a wide range of operating frequency bands, as well as support spectrum allocations for 7 MHz and 8 MHz bands.
In addition, ISDB-Tmm is highly compatible with the digital terrestrial television system standard, allowing the sharing of receivers and the reduction of transmission costs. For these reasons, ISDB-Tmm is considered to be the ideal multimedia broadcasting system for countries, including those in South America, that have already adopted ISDB-T as the standard for their digital terrestrial television system.
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