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Type B videotape

From Wikipedia, the free encyclopedia

Type B Videotape
Open reel tape, Type B.jpg
Type B videotape, one hour reel
Media typeMagnetic Tape
CapacityUp to 2 hours (120 Min.)
Read mechanismHelical scan
Write mechanismHelical scan
StandardInterlaced video
Developed byBosch Fernseh
Dimensions1 Inch reel to reel
UsageVideo production

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 met with greater success.[1][2][3][4]


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 9,000 RPM with a 190-degree wrap around a very small head drum, recording 52 video lines per head segment. A single video frame was recorded across 6 tracks in the tape. The format only allowed for play, rewind and fast forward.[5] 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.[6][7][8] BCN 50 VTRs were used at the 1980 Summer Olympics in Moscow.[9]

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.[10]

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.[11][12]

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.[13][14][15]

Type B video Scanner Head
Type B video Scanner Head
Type B VTR, BCN 20 Tape Desk and video Scanner
Type B VTR, BCN 20 Tape Desk and video Scanner

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,[16]
  • BCN40 (1976, record unit with no TBC playback)[17]
  • BCN50 (1976, recorder with TBC playback)[18]
  • BCN20 (1976, one hour, portable with no TBC playback)[19]
  • 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 (2612 pound, portable cart recorder, 40 min.)[20][21][22]
  • BCN100 (random access 32 multicassette machine, up to 16 hours rec/playback-20 min per tape) Each unit had 3 tape desks with a 21 sec load time each cart. For on air playback and 3 deck editing system[23][24]
  • 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)[25][26]
  • BCN53 (recorder with Digital TBC playback, with slow motion & visible shuttle)[27][28]
  • HR-400 : RCA also sold the BCN50 as an HR-400.[29]

Special BCN units

  • Ruxton Video in Burbank (1970–1980s) used modified BCNs for 24 Frame playback to TVs used on movie studio sets. Thus the TVs had no flicker when seen on film, due to the film-compatible frame rate. Bill Hogan of Ruxton Ltd received in 1981 an Academy Award for Technical Achievement for his 24frame TV work.[30][31]
  • Image Transform in Universal City, co-founded by Ken Holland, in 1970,[32] used specially modified BCNs to record 24-frame video also, but for their "Image Vision" system. The BCN would record and play back 24-frame video at 10 MHz bandwidth, with twice the standard 525-line NTSC resolution. To record this the headwheel and capstan ran at twice normal speed. Modified 24 frame/s 10 MHz Bosch Fernseh KCK-40 professional video cameras were used on the set. This was a custom pre-HDTV video system. This Image Vision recording could then be recorded to film on a modified 3M Electron Beam film recorder (EBR). Image Transform had modified other gear for this process. At its peak, this system was used to make "Monty Python Live at the Hollywood Bowl" in 1982.[33] This was the first major use of early electronic cinema technology (using wideband high-resolution analog video technology, predating IT-based DI (digital intermediate) post production for film nowadays) using a film recorder for Film out. Electronovision was also a pre-process like Image Vision. Merlin Engineering also worked on the BCN's wide bandwidth, 10 MHz, BCN modification.[34][35]
  • Bell and Howell (later Rank Video Services) used special BCNs for mass VHS duplication. These specially-modified BCN VTRs could play back movies at two times the normal speed. In addition, the sync signals were also were at two times speed as well. For proper playback, the headwheel and capstan also ran at twice normal speed. Specially modified VHS recorders could record this video. In doing this, the duplication plant could output twice the product than normal videocassette duplicating systems.[36][37][38]
  • Bell and Howell's Data Tape division in Pasadena, California modified BCNs to record high speed data for instrumentation purposes. These instrumentation recordings were mostly used by US government agencies, such as for NASA on the Space Shuttle. This unit could record data from up to 800 sensors.[39][40][41]
  • Because of the small scanner, BCNs could record even at high g-forces. Hand picked BCN20 VTRs could record at low temperatures, down to -40 °C (-40 °F). This was done at the Olympic Winter Games in Lake Placid (1980) and in Sarajevo (1984).[42]
  • Some users modified BCNs to fit 2-hour reels of tape on the BCN, so complete 2-hour movies could fit on one reel of tape. Bosch later made this a factory option, and was designated as BCN LP.
  • Bosch also offered SLP BCN, a "long-play" variant of the format. It moved the tape at 1/3 speed so that up to 6 hours could be recorded one reel. The unit has a special head wheel with azimuth head. This was mostly used for time zone tape delay by television networks. With a head wheel change and a switch the unit could be returned to normal play.
  • Between 1977 and 1980 the UK Independent Broadcasting Authority (IBA) experimented with a B format machine as part of their researches into digital video broadcasting standards. In April 1980 a machine was exhibited at a meeting of the EBU Technical Committee in London as part of a complete digital studio system based on a proposed video standard based on YUV 12.4.4. The machine is described in a paper in the IBA Technical Review of March 1982 which can be found here [43] by scrolling down to the item IBA_TechnicalReviews1-24""
  • One of the first Digital SDTV VTRs was a non-production prototype BCN deck that could record and play back early type of CCIR 601 digital signals. These three Bosch VTRs paved the way for the later SMPTE D1 VTR standard. In 1985 and 1986 in a Rennes experimental digital studio in France, an experimental all-digital television center was made, it used the two all digital BCN units.[44][45][46]
  • The BCH 1000 is an analog high-definition television VTR that records and playbacks HD-MAC at 50 frames per second, each at a resolution of 2048×1152. The BCH 1000 was used in the 1992 Summer Olympic Games in Barcelona and 1992 Winter Olympics in Albertville. It used 8 video heads to handle the increased bandwidth requirements of HD-MAC, due to its high resolution.[47][48][49][50]


  • 1 Inch open reel to reel analog video system.
  • Video scanner rotation 9600 rpm, 150 rps.
  • 52 horizontal lines per head.
  • Video FM signal at a bandwidth of 5,5 MHz
  • Three analog audio tracks: 2 audio tracks and 1 linear timecode track, 0.8mm wide - 30 mils
  • One analog control track 0.4mm wide - 15 mils, built into video scanner head.
  • Magnetic tape coating on the outside of the videotape reel.
  • Studio reel 96 minutes, later 120 minutes
  • Portable reel 60 minutes
  • Cart reel 20 minutes (BCN5 - BCN100)
  • Video scanner wrap 190 deg.
  • Video scanner dia. 50.3mm, 2 inches
  • Video track length 3.1 inches, 80mm
  • Video track gap 40 um, 1.5 mils
  • Tape speed 24 cm/sec - 9.5 ips.
  • Video head write speed: 24m /sec - 950 ips
  • Video track angle 14.3 deg.
  • Video track width 160 um - 6.3 mils
  • Two video record/play heads at 180 deg. (rotary transformer)
  • Two video erase head for insert edits at 180 deg. (rotary transformer)


Some BCN users

See also


  1. ^ SMPTE Motion Imaging Journal page 289-299, 1981
  2. ^, Shane Nugent Videotape Operations 1974-2004,  by ken On April - 8 - 2009
  3. ^ BCN 51 Videotape Recorders, September 20, 2017, Jan Plomp
  4. ^, Bosch BCN 1 inch
  5. ^ "Videotape | NFSA". Archived from the original on 2019-04-06.
  6. ^ Magnetic recording: the first 100 years, page 174-175, By Eric D. Daniel, C. Denis Mee, Mark H. Clark
  7. ^ BNC recorders
  8. ^, BCN Patent
  9. ^ SMPTE, Aug. 25, 2008 Issue, page 2, BCNs at the 1980 Moscow Summer Olympics Moscow
  10. ^ Society of Motion Picture and Television Engineers, The BCN System for Magnetic Recording of Television Programs by Heinrich L. Zahn1
  11. ^ The History of Television, 1942 to 2000, page 196, By Albert Abramson, Christopher H. Sterling
  12. ^ Charles Bensinger, 1981, The Video Guide, page 101
  13. ^ Arvin/Echo
  14. ^ 1975 – Bosch-Fernseh BCN 20 / BCN 40/50 1" tape
  15. ^ 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.
  16. ^ The Bosch/Philips BCR 1" helical scan TVR that was shown in 1973 and preceded the BCN.
  17. ^ broadcasting101.w BCN 40 (right side) and BCN 50 (left side)
  18. ^ BCN 50 deck
  19. ^ Prototype BCN 20 with a Bosch KCR camera
  20. ^ The history of television, 1942 to 2000 By Albert Abramson, page 183
  21. ^ BCN 5 and BCN 20 add
  22. ^, BCN-5 photo
  23. ^ .SMPTE, journal page 744, The BCN 100,Oct 1979
  24. ^, BCN-100 photo
  25. ^ BCN 21, with specs
  26. ^, Reel To Reel COLLsite BOSCH BCN 21 Gallery
  27. ^ German page on BCN53,
  28. ^ Eng. translation by google on BCN53
  29. ^ RCA TV Equipment Section of The Broadcast Archive, Maintained by: Barry Mishkind, a RCA HR-400
  30. ^ Oscar Technical Achievement Award, Bill Hogan (II) (Ruxton, Ltd); Richard J. Stumpf (Universal City Studios' Production Sound Department); Daniel R. Brewer (Universal City Studios' Production Sound Department)- For the engineering of a 24-frame color video system.
  31. ^ Academy Awards, Technical Achievement Award, Bill Hogan (II) (Ruxton, Ltd), March 29, 1982, Los Angeles, California
  32. ^ NewBay Media The Top Guns of Digital Intermediate, January 28, 2004, Ken Holland
  33. ^ Monty Python Live at the Hollywood Bowl
  34. ^ Tech Review with Al Sturm, April 2011
  35. ^ 24frame BCN history at Image Transform
  36. ^ Billboard Nov 17, 1979 VHS duplication
  39. ^ Sypris Company on Bell and Howell's Data Tape division
  40. ^ Computerworld Nov. 12, 1975 on Bell and Howell's Data Tape division
  41. ^ Computerworld May 7, 1975 on Bell and Howell's Data Tape division
  42. ^ SMPTE Page two on the Lake Placid (1980)
  43. ^ "NTLPA Gallery - Shared with pCloud".
  44. ^ An Experimental All-Digital Television Center, by D. Nasse1, J. L. Grimaldi2 and A. Cayet3
  45. ^ The History of Television, 1942 to 2000, By Albert Abramson, Christopher H., page 209.
  46. ^ The World's First All-Digital Television Production,by Michel Oudin, Jan 1, 1987
  47. ^ Live Production, A Brief Review on HDTV in Europe in the early 90s
  48. ^ HDTV at 1992 Expo
  49. ^ Analog HDTV
  50. ^ The World's First All-Digital Television Production, by Michel Oudin, 1987
  51. ^ BCN specs, chart
  52. ^ BCNN Specs

External links

This page was last edited on 28 October 2022, at 07:40
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