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Old 8th October 2013, 13:22   #7  |  Link
pandy
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Join Date: Mar 2006
Posts: 1,049
Quote:
Originally Posted by Music Fan View Post
Because I read several times that VHS recorded video in a composite mode, Y and C are blended.
S-VHS record Y and C separately, thus a s-video cable is especially useful for S-VHS.
It means that for VHS, Y and C have to be separated by the capture card (if VCR connected in composite) or before, like I tried with the dvd burner used as intermediary.
This is not true - Y and C in each color VCR are recorded separately - "The luminance (Y) and color (C) components of the composite video signal are recorded differently. Luminance, which is in effect the black and white picture with all the high resolution components but no color, is frequency modulated on a carrier at around 3.4 MHz. The deviation is about 1 MHz and the maximum frequency recorded on a VHS tape is a little over 5 MHz (Beta is slightly different and S versions of Beta and VHS extend some of these to achieve higher bandwidths. The color signal is separated from the composite video and is amplitude modulated on a 629 kHz carrier. This is called the "color under' system."

http://www.repairfaq.org/sam/vcrfaq.htm#vcrvhsvid
http://www.modeemi.fi/~leopold/AV/VideoFormats.html

main difference between S-VHS and VHS (except resolution) is fact that VHS VCR usually have no separate output for C and Y signal (S-Video) - S-VHS VCR can read VHS tape and S-Video providing Y and C will be better than CVBS.
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