| Japan adopts ISDB-Tmm for mobile multimedia broadcasting |
| Posted: February 2010 | ||||||
 TOKYO – ISDB-Tmm has been adopted in Japan as one of the standards
for nationwide mobile multimedia broadcasting. Aimed at viewers across the country, broadcasting using this standard is scheduled for deployment after 24 July 2011, when the current analogue TV broadcasting shuts down. ISDB-Tmm technology is said to be highly compatible with ISDB-T, which is the standard for the Japanese terrestrial digital broadcasting that was deployed in 2003. This technology is actively promoted by the ISDB-T Multimedia Forum, a group made up of approximately 80 Japanese corporations — another compelling reason why the use of ISDB-Tmm technology for broadcasting will become a reality next year. The forum said with regards to the application of ISDB-Tmm for multimedia broadcasting, nationwide broadcasting is scheduled to use 207.5-222MHz, while VHF band 90-108MHz will be used for regional broadcasting. Also adopted for nationwide broadcasting is MediaFLO while ISDB-TSB has been chosen for regional broadcasting. ISDB-TSB is highly compatible with ISDB-T and ISDB-Tmm, making it possible to broadcast over a narrow bandwidth. ISDB-T, ISDB-Tmm and ISDB-TSB standards were developed with the same technology to form the “ISDB-T family”. ISDB-Tmm eliminates the need for a guard band by combining some blocks of 13 segments (approximately 5.6MHz) and several 1 segments (1 segment = approximately 0.4MHz), and can be applied to various different bands of frequency. In preparation for the start of ISDB-Tmm, a transmitter capable of transmitting a combination of 33 segments (14.2MHz) has already been developed. This device can fully handle the frequency band (14.5MHz) specified for mobile multimedia broadcasting, thereby significantly reducing transmission costs. The ISDB-T Multimedia Forum added that the versatility of ISDB-Tmm enables it to be flexibly applied to a wide range of operating frequency bands, as well as support spectrum allocations for 7MHz and 8MHz bands. Furthermore, ISDB-Tmm is highly compatible with the format used for the existing digital terrestrial TV (ISDB-T) systems. Add this page to your favorite Social Bookmarking websites       
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