MobaHo!
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MobaHo! is a mobile satellite digital audio/video broadcasting service in Japan. MobaHo! services began on 20 October 2004. MobaHo! uses digital broadcasting specification of ISDB. The satellite providing this service is jointly owned by SK Telecom of Korea and MBCO of Japan.
An increasing number of receivers are available for this service: portable receivers with built in QVGA LCD screens, car-use, a laptop-use PC card receiver, a mobile phone (by DoCoMo) and more.
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[edit] Technical information
This service uses ISO MPEG-4 Version 1 Simple Profile @ L3 video and AAC audio encapsulated in MPEG2 Transport Stream. The maximum supported resolution is 320x240 pixels (QVGA), and the maximum video bitrate is 384 kbit/s at a frame rate of 15 frames per second. Audio conforms to the ISO/IEC 13818-7 AAC LC (Low Complexity) profile, with maximum bitrate of 144 kbit/s and sampling rates up to 48 kHz. The transmission is scrambled using the MULTI2 cipher for conditional access.
This service is broadcast over 2.6 GHz S-band by MBSat at 144.0°E. Left Circular polarized beam covers Japan, while Right Circular polarized beam covers South Korea. These are intended to be received by portable devices with omni-directional antennas. A single 150 W Ku band transponder on MBSat, operated at 12.226GHz and Symbol rate of 18433 is used to broadcast identical contents to "Gap-fillers" (re-transmission devices) which are currently being installed in train stations and subways, and other areas where the S-band satellite beam would not reach. This repeater broadcast is also scrambled using MULTI2.
[edit] Receiver devices
- MBT0102A by MBCO - PC card type. This is the only device which allows recording broadcasts. However, DRM technology is used to prohibit playback of recorded content without the receiver card present. Hardware encryption chip and presumably receiver serial number is used to encrypt the recording.
- Mobile phone: Music Porter X by DoCoMo
- and more
