Variable digital phase-shifter and digital velocity corrector for use in video recorders
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United States of America Patent
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Apr 12, 1988
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N/A
app pub date -
May 20, 1986
filing date -
May 24, 1985
priority date (Note) -
Expired
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Abstract
A variable digital phase-shifter comprises a variable-propagation-time phase corrector consisting of a nonrecursive transversal digital filter having a predetermined even number N of coefficients. The filter is coupled with an amplitude corrector consisting of a nonrecursive transversal digital bandpass filter with an odd number of coefficients, a multiplier and a summing circuit for correcting the variations in gain of the phase corrector in order to obtain an approximately constant overall gain of the variable digital phase-shifter.
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