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From Wikipedia, the free encyclopedia

V-Cord
Media typeMagnetic Tape
EncodingNTSC, PAL
Capacity60 minutes, 120 minutes
UsageHome movies
Released1974

V-Cord is an analog recording videocassette format developed and released by Sanyo. V-Cord (later referred to as V-Cord I) was released in 1974, and could record 60 minutes on a cassette. V-Cord II, released in 1976, could record 120 minutes on a V-Cord II cassette.

The V-Cord II machines were the first consumer VCRs to offer two recording speeds.

Appearance

The original V-Cord cassette had a large hub and was wound with standard-thickness magnetic tape; V-Cord II used a small hub wound with thin tape, the same thickness later used for VHS-120 and Beta L-750. The cassettes were not rectangular, being tapered at one narrow end. Unlike subsequent formats VHS and Betamax, which loaded with the tape facing front on the long side of the cassette, the V-Cord cartridge was loaded sideways with the narrow side serving as the "front" and the tape coming out the "side".

The tape was held in place in the machine by a notch halfway down the right side of the tape, similar to what holds an 8-track tape into its player.

Operation

The earliest machines recorded only in black and white and had no rewind mechanism, like the Cartrivision format of a few years earlier; an external rewinder was used after recording or playing a tape. External rewinders were later used with the VHS and Beta formats, although the machines could rewind tapes; external rewinders were considerably faster than the rewind function.

Recording format

The system had two recording modes: standard mode (STD), and a long-play mode (LP) which sacrificed recording quality for extra capacity. In STD mode both recording and playback heads are used, writing both fields of each interlaced video frame. In long-play mode only a single head is used to record a single field from each video frame, with each field being read twice on playback, in a "skip field" technique.[1][2] The heads scanned the tape in a helical scan fashion [2]

Tape was moved forward at 2.91 inches per second in STD mode, and 1.45 inches per second in LP mode;[1] this gave a recording time of one-hour in standard mode and two hours in long-play mode. Horizontal resolution in color was quoted as 250 lines in advertising materials, stretching to 300 lines in black-and-white, with a video signal-to-noise ratio of 45 dB.[2] Audio response was specified as 80 to 10,000 Hz at -6 dB in STD mode, dropping to 80 to 8,000 Hz in LP mode.[2]

The tape was a half-inch cobalt doped tape with a 550 oersted coercivity. The cassette measured 4 ​516" by 6 ​316" by 1". Two cassette types were available, a V60 and a V120 whose names matched their recording capacity in LP mode. The cassettes are similar in appearance to eight-track cartridges.

Conventional VHS and Beta formats recorded in a helical scan format, resulting in angled tracks running from the lower edge of the tape to the upper edge some distance down. Unlike these formats, the V-Cord format was closer to the 2-inch quadruplex videotape format used from the inception of video in the late 1950s until 2-inch helical IVC videotape format was introduced twenty years later, in that its tracks ran nearly perpendicular to tape travel.

A portable four-head video recorder, the Sanyo VTC-7100, used a similar format of cassette, but produced incompatible recordings.

V-Cord VCRs

Toshiba KV-4000, KV-4100, and KV-4200; and Sanyo VTC-7300, VTC-8000, and VTC-8200 V-Cord I/II VCR (1976)

References

  1. ^ a b Abramson, Albert (2003). The History of Television, 1942 to 2000. Jefferson, N.C.: McFarland & Co., Publishers. pp. 160, 170–171. ISBN 9780786412204. OCLC 48837571.
  2. ^ a b c d "Sanyo V-Cord II System advertising brochure" (JPEG). LabGuy's World: The History of Video Tape Recorders before Betamax and VHS.

Further reading

  • ? (February 1978). "Videotape Recorders for 1978". Radio-Electronics. Gernsback Publications. 49? (2?): 52–55.CS1 maint: numeric names: authors list (link) Abramson's The History of Television's source of information on the V-Cord.

External links

This page was last edited on 18 April 2020, at 17:22
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