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1 inch type B VTR (designated Type B by SMPTE) is a reel-to-reel analog recording video tape format developed by the Bosch Fernseh division of Bosch in Germany in 1976. The magnetic tape format became the broadcasting standard in continental Europe, but adoption was limited in the United States and United Kingdom, where the Type C videotape VTR was met with greater success.〔(SMPTE Motion Imaging Journal page 289-299, 1981 )〕 The tape speed allowed 96 minutes on a large reel (later 120 minutes), and used 2 record/playback (R/P) heads on the drum rotating at 9000 RPM with a 190 degree wrap around a very small head drum, recording 52 video lines per head segment. Video is recorded on an FM signal with a bandwidth of 5.5 MHz. Three longitudinal audio tracks are recorded on the tape as well: two audio and one Linear timecode (LTC) track.〔(Magnetic recording: the first 100 years, page 174-175, By Eric D. Daniel, C. Denis Mee, Mark H. Clark )〕〔(BNC recorders )〕〔(freepatentsonline.com, BCN Patent )〕 BCN 50 VTRs were used at the 1980 Summer Olympics in Moscow〔SMPTE, Aug. 25, 2008 Issue, page 2, BCNs at the 1980 Moscow Summer Olympics Moscow〕 The format required an optional, and costly, digital framestore in addition to the normal analog timebase corrector to do any "trick-play" operations, such as slow motion/variable-speed playback, frame step play, and visible shuttle functions. This was because, unlike 1 inch type C which recorded one field per helical scan track on the tape, Type B segmented each field to 5 or 6 tracks per field according to whether it was a 525 (NTSC) or 625 (PAL) line machine.〔(Society of Motion Picture and Television Engineers, The BCN System for Magnetic Recording of Television Programs by Heinrich L. Zahn1 )〕 The picture quality was excellent, and standard R/P machines, digital frame store machines, reel-to-reel portables, random access cart machines (for playback of short-form video material such as television commercials), and portable cart versions were marketed.〔(The History of Television, 1942 to 2000, page 196, By Albert Abramson, Christopher H. Sterling )〕〔(Charles Bensinger, 1981, The Video Guide, page 101 )〕 Echo Science Corporation, a United States company, made units like a BCN 1 for the U.S. military for a short time in the 1970s. Echo Science models were Pilot 1, Echo 460, Pilot 260.〔(labguysworld.com Arvin/Echo )〕〔(fernsehmuseum.info 1975 – Bosch-Fernseh BCN 20 / BCN 40/50 1" tape )〕〔Echo Science Corp., located in Mountain View, California was a subsidiary of Arvin Industries, Inc., based in Columbus, Indiana, from 1974 to 1981. It was also known as "Arvin/Echo" for short. http://www.referenceforbusiness.com/history2/15/Arvin-Industries-Inc.html〕 ==Models introduced== *BCR (BCR 40, BCR 50 and BCR 60)was a pre BCN VTR, made with Philips, the large scanner made it not useful,〔(vtoldboys.com ) The Bosch/Philips BCR 1" helical scan TVR that was shown in 1973 and preceded the BCN.〕 *BCN40 (1976, record unit with no TBC playback)〔(broadcasting101.w ) BCN 40 (right side and BCN 50 left side〕 *BCN50 (1976, recorder with TBC playback)〔(broadcasting101.ws ) BCN 50 deck〕 *BCN20 (1976, one hour, portable with no TBC playback)〔(broadcasting101.ws ) Prototype BCN 20 with a Bosch KCR camera〕 *BCWQ ("L" Unit for BCN20/21, added TBC playback to the portable units) *Effects control option for digital framestore, for freeze frame, quad split and mirror effects (early digital Special effects). *BNC51 (recorder with TBC playback, optional Slow motion and visible shuttle) *BCN5 (26½ pound, portable cart recorder, 40 min.)〔(The history of television, 1942 to 2000 By Albert Abramson, page 183 )〕〔(adsausage.com ) BCN 5 and BCN 20 add〕〔(fernsehmuseum.info, BCN-5 photo )〕 *BCN100 (random access 32 multicassette machine, up to 16 hours rec/playback-30 min per tape)〔(journal.smpte.org ) .SMPTE, journal page 744, The BCN 100,Oct 1979〕〔(fernsehmuseum.info, BCN-100 photo )〕 *BCN52 (recorder with Digital TBC playback, with slow motion & visible shuttle) *BCN21 (lightweight reel to reel portable with no TBC playback, first Composite material VTR)〔(adiomuseum.org BCN 21, with specs )〕〔(dyndns.org, Reel To Reel COLLsite BOSCH BCN 21 Gallery )〕 *BCN53 (recorder with Digital TBC playback, with slow motion & visible shuttle)〔(German page on BCN53, )〕〔(Eng. translation by google on BCN53 )〕 *HR-400 : RCA also sold the BCN50 as an HR-400.〔(RCA TV Equipment Section of The Broadcast Archive, Maintained by: Barry Mishkind, a RCA HR-400 )〕 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 B videotape」の詳細全文を読む スポンサード リンク
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