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1 inch Type C (designated Type C by SMPTE) is a professional reel-to-reel analog recording helical scan videotape format co-developed and introduced by Ampex and Sony in 1976. It became the replacement in the professional video and broadcast television industries for the then-incumbent 2 inch Quadruplex videotape (2 inch Quad for short) open-reel format, due to the smaller size, comparative ease of operation (vs. 2 inch) and slightly higher video quality of 1 inch type C video tape recorder (VTR). 1 inch type C required less maintenance downtime than Quadruplex videotape, and did not require digital time base correction to produce a stable video signal. 1 inch Type C is capable of "trick-play" functions such as still, shuttle, and variable-speed playback, including slow motion. 2 inch Quadruplex videotape machines lacked these capabilities, due to the segmented manner in which it recorded video tracks onto the magnetic tape. Also, 1 inch Type C VTRs required much less maintenance (and used less power and space) than did 2 inch machines. 1 inch Type C records composite video at a very high video quality that is superior to contemporary color-under formats such as U-matic, and of comparable quality to analog component video formats like Betacam and MII. Both analog component formats were notoriously fussy and trouble-prone, so in practice Type C gave a stable, more reliable picture than the broadcast quality analog cassette-based videotape formats. Because television was broadcast as a composite signal, there was no real downside to Type C in television broadcasting and distribution. The quality and reliability of 1 inch Type C made it a mainstay in television and video production in television studios for almost 20 years, before being supplanted by more reliable digital videocassette formats like DVCAM, D-1, D-2 and DVCPro. 1 inch Type C was also widely used for the mastering of early LaserDisc titles. It was replaced in that role by the digital D-2 videocassette format in the late 1980s. ==Some Ampex models== * VPR-2 1976, studio model * VPR-20 1977, Portable〔(adsausage.com ) VPR-20 Add〕 * VPR-2A studio model * VPR-2B studio model〔(sausage.com ) VPR-2B studio model add〕 * VPR-80 studio model * VPR-6 studio model * SMC-60 slow Motion system * VPR-3 studio model, with air system like AVR-1 * XVR-80 wideband VTR * VPR-5 portable made in jointly with Nagra 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Type C videotape」の詳細全文を読む スポンサード リンク
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