W-VHS

From Wikipedia, the free encyclopedia
Media type Magnetic Tape
Encoding 1035i or 480i
Developed by JVC
Usage Home movies, Home video, Video production

W-VHS is a HDTV analog recording videocassette format created by JVC. The format was originally introduced in 1994 for use with Japan's Hi-Vision, an early analog high-definition television system.

W-VHS was named so because "W" in Japanese sounds like "double".

The recording medium of W-VHS is a ½-inch metallic magnetic tape stored in a cartridge the same size as VHS. The tape can be used to store 1035i (HD) or 480i (SD) and a double channel of 480i (for storing 3D programs[1])(SD2) analog signals (but not 480p, 720p or 1080i). The video signal is recorded using a method called "time compression integration" which "records separated component video, luminance and color signals are offset by time in alternating parts of the video track".[2] Because video signals are recorded in component form instead of the color under method used by S-VHS, standard definition image quality for W-VHS is typically much higher, due to the lack of noise caused by a chroma sub-carrier. Audio is stored in the VHS Hi-Fi or S-VHS Digital Audio formats.

W-VHS VCRs were one of the only devices consumers could use to record a standard or high definition video signal via an analog Y/Pb/Pr component interface. Very few devices with this capability exist, possibly due to content copyright restrictions. W-VHS has also been used for medical imaging, professional previewing, and broadcasting.

Currently, it is very difficult to find either W-VHS VCRs or tapes. Since W-VHS tapes are harder to find users have turned to the similar Digital-S (D-9) tape. While D-9 tapes are still not that easy to find, they are more available than W-VHS tapes in certain regions. JVC Professional even recommends the use of them for W-VHS. The running time between W-VHS and Digital-S is not the same; a Digital-S tape with a length of 64 min is approximately 105 min when used with W-VHS.

See also

References

  1. ↑ What is a 3D theater
  2. ↑ Quote from JVC SR-W5U pdf brochure.

External links

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