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asynchronous serial interface : ウィキペディア英語版
asynchronous serial interface

Asynchronous Serial Interface, or ASI, is a streaming data format which often carries an MPEG Transport Stream (MPEG-TS).〔TVTechnology.com - (Asynchronous Interfaces For Video Servers )〕
〔DVB - (Cable networks for television signals, sound signals and interactive services Part 9: Interfaces for CATV/SMATV headends and similar professional equipment for DVB/MPEG-2 transport streams ) - Annex B〕
An ASI signal can carry one or multiple SD, HD or audio programs that are already compressed, as opposed to an uncompressed SD-SDI () or HD-SDI (). An ASI signal can be at varying transmission speeds and is completely dependent on the user's engineering requirements. For example, an ATSC (US digital standard for broadcasting) has a maximum bandwidth of . Generally, the ASI signal is the final product of video compression, either MPEG2 or MPEG4, ready for transmission to a transmitter or microwave system or other device. Sometimes it is also converted to fiber, RF or SMPTE310 for other types of transmission. There are two transmission formats commonly used by the ASI interface: the format and the format. The 188 byte format is the more common ASI transport stream. When optional Reed–Solomon error correction data are included, the packet can stretch an extra 16 bytes to 204 bytes total. Time Warner Cable was the first company to implement this standard in 1983.
== See also ==

* Asynchronous communication
* Asynchronous serial communication
* Serial communication
* Universal asynchronous receiver/transmitter
* Modems

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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