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Digital-S
D-9 or Digital-S as it was originally known, is a professional digital video videocassette format created by JVC in 1995. It is a direct competitor to Sony's Digital Betacam. Its name was changed to D-9 in 1999 by the SMPTE.〔("D-9: Introduction to the format" ), Short introduction to the D-9 format. Accessed October 13, 2007.〕 It was used to a small extent in Europe and Asia and saw some use in the US, notably by the Fox news channel,〔("D-9 in action worldwide" ), Shows areas where D-9 is in use. Accessed October 13, 2007.〕 but was a commercial failure compared with Digital Betacam. It was superseded by high definition tapeless formats.
==Technical details==
D-9 uses a tape shell of the VHS form factor, but the tape itself uses a much higher quality metal particle formulation. The recording system is digital and for video uses DV compression at a 50 Mbit/s bitrate. Video is recorded in 4:2:2 component format at a variety of standard definition resolutions, in either 4:3 or 16:9 aspect ratios. Audio is recorded as 16bit/48 kHz pcm with up to four separate channels.〔("D-9 technical specifications" ), Displays general D-9 technical specifications. Accessed October 13, 2007.〕 Video quality is generally very high; at standard definition, D-9's quality is comparable with Digital Betacam.〔("JVC Professional Japan" ), cites SMPTE/EBU taskforce results. Accessed October 13, 2007.〕
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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