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2009.12.24  ISDB-Tmm Adopted for Mobile Multimedia Broadcasting in Japan

ISDB-T Multimedia Forum
December 24, 2009

ISDB-Tmm has been adopted as one of the standards for nationwide mobile multimedia broadcasting in Japan. Broadcasting using this standard is aimed at viewers across the country, and is scheduled to start after July 24, 2011, at which time current analog TV broadcasting will close down. ISDB-Tmm technology is highly compatible with ISDB-T, which is the standard for the Japanese terrestrial digital broadcasting and in operation from 2003. 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 regards to the application of ISDB-Tmm for multimedia broadcasting, nationwide broadcasting is scheduled to use 207.5-222 MHz, while VHF band 90-108 MHz will be used for regional broadcasting. In addition to the ISDB-Tmm standard, MediaFLO has also been adopted for nationwide broadcasting, and ISDB-TSB 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 block of 13 segments (approx. 5.6 MHz) and several 1 segments (1 segment = approx. 0.4 MHz), 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 (14.2 MHz) has already been developed. This device can fully handle the frequency band (14.5 MHz) specified for mobile multimedia broadcasting, thereby significantly reducing transmission costs.

As is clearly shown above, 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 7 MHz and 8 MHz bands.

In conclusion, ISDB-Tmm is highly compatible with the format used for digital terrestrial television systems (ISDB-T). In addition, it offers a means for optimizing the benefits of sharing resources to develop receivers and using combined transmissions adapted to the dedicated bandwidth of each country. 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 for Digital Terrestrial Television systems.


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About ISDB-T Multimedia Forum

ISDB-T Multimedia Forum is an organization dedicated to researching new broadcasting services that utilize the ISDB-T format family to contribute to the advance of the digital broadcasting in Japan. The forum also promotes the benefits of mobile multimedia broadcasting that will continue to use the available VHF/UHF frequency bands after analog broadcasting is ended. In addition, the forum also distributes useful information and hosts various study sessions and seminars related to digital broadcasting.

Members of ISDB-T Multimedia Forum:

Steering Board Members:
Fuji Television Network, Inc., NIPPON TELEVISION NETWORK CORPORATION, TOKYO BROADCASTING SYSTEM HOLDINGS, INC., ITOCHU Corporation, Sumitomo Corporation, SKY Perfect JSAT Corporation, Multimedia Broadcasting, INC, DENTSU INC., TV Asahi Corporation
Members:
RF Radio Nippon Co., Ltd., ACCESS CO., LTD., ASATSU-DK INC., Asahi Broadcasting Corporation, Alpine Electronics, Inc., Anritsu Corporation, ITOCHU Techno-Solutions Corporation, IMAGICA TV Corp., INFOCITY,Inc, Excite Japan Co., Ltd., NKB Inc., OKI SEMICONDUCTOR CO., LTD, CASIO COMPUTER CO., LTD., Kansai Telecasting Corporation, Kids Station Inc., QVC Japan, Inc., Kyodo Televison,Ltd., GOURMET NAVIGATOR INCORPORATED, KDDI CORPORATION, SANKEI LIVING SHIMBUN Inc., SANYO Electric Co., Ltd., CSK Institute for Sustainability, Ltd, J-WAVE, Inc, J SPORTS Broadcasting Corporation, SHARP CORPORATION, Japan Entertainment Network K.K., Jupiter Shop Channel Co.,Ltd, SPACE SHOWER NETWORKS INC., Sumisho Computer Systems Corporation, Systems Engineering Consultants Co.,LTD., Sony Corporation, Sony Broadcasting Media Co., SOFTBANK MOBILE Corp., DAIICHIKOSHO CO.,LTD., Daiwa Securities Media Networks Co, Ltd, D2 Communications Inc., Dinos Inc., TV Asahi Data Vision Corporation, TV TOKYO Corporation, Denki Kogyo Company, Limited, TOSHIBA CORPORATION, Tomo-Digi Corporation , Kabushiki Kaisha NANO PIA, Nikkei CNBC Japan, Inc., Nippon Broadcasting System, Inc., NEC Corporation, NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Nippon BS Broadcasting Corporation, Japan Broadcasting Corporation, Nomura Securities Co.,Ltd., PIONEER CORPORATION, HAKUHODO DY MEDIA PARTNERS INCORPORATED, VAP inc., Panasonic Corporation, BANDAI CHANNEL CO., LTD., Pia Digital Communications Corporation Inc., Hitachi Kokusai Electric Inc., Hitachi, Ltd., Forecast Communications Inc., FUJITSU LIMITED, FUJIMIC INC., Nippon Cultural Broadcasting Inc., PONY CANYON INC., Mitsubishi Electric Corporation, Murata Manufacturing Co., Ltd., MegaChips Corporation, MOBILE MEDIANET ,Inc, YOMIURI TELECASTING CORPORATION, RECRUIT CO., LTD., Renesas Technology Corp., WOWOW INC.
Contact Information
Hiroaki Haranaka
ISDB-T Multimedia Forum Head Office
4F Sanno Park Tower, 2-11-1　Nagata-cho,Chiyoda-ku Tokyo 100-6104
TEL: 03-3539-1785
FAX: 03-3539-1753
E-Mail: mmf-desk@mmbi.co.jp
URL: http://www.isdb-t.jp/

    about
    ISDB-T Multimedia Forum

    ISDB-T Multimedia Forum is an organization dedicated to researching new broadcasting services that utilize the ISDB-T format, in order to contribute to the advancement of digital broadcasting in Japan. The forum also promotes the benefits of mobile multimedia broadcasting?which will continue to use the available VHF frequency band after analog broadcasting has ended.