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D-2 (video)
D-2 is a professional digital videocassette format created by Ampex and introduced at the 1988 〔(【引用サイトリンク】title=Ampex History )〕 NAB (National Association of Broadcasters) convention as a composite video alternative to the component video D-1 format. It garnered Ampex a technical Emmy in 1989.〔 Like D-1, D-2 stores uncompressed digital video on a tape cassette; however, it stores a composite video signal, rather than component video as with D-1. While component video is superior for advanced editing, especially when chroma key effects are used, composite video is more compatible with most existing analog facilities.
==History==
Ampex created the first D-2 video machine, the ACR-225 commercial spot player working with Sony, who had done some early research into composite digital video, as a cost-effective solution for TV broadcasters with large investments in composite analog infrastructure such as video routers and switchers, since it could be inserted into existing analog broadcast facilities without extensive redesign or modifications. This was because D-2 machines accepted standard analog video and audio inputs and outputs. D-2 machines are capable of interfacing through either serial digital video or analog video connections. Four PCM audio channels are available for editing (an improvement over the then-popular Type C analog machines with two audio channels) as well as an analog cue channel and timecode, also with digital or analog connections.
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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