Abstract
In most present-day helical-scan cassette videotape players, tape tension (and therefore tape stretch) is not controlled by a vacuum block as in quadruplex systems but by manual adjustment of the tape supply tension. If the tension is not correct, a timing error results which causes the picture to be skewed to the left or right. An effective automatic skew-correction circuit has been developed that feeds an output signal through an operational amplifier and a Darlington output stage to 2 rotary solenoid that controls tape tension. Skew error after correction is less than 0.5 μs. One type of widely used Japanese cassette player was modified with the skew corrector in less than 20 min using only screwdriver and soldering iron. When a videotape cassette player must operate unattended and when tapes come from many sources automatic skew correction is essential.
Published Version
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