Digital delay FM demodulator with filtered noise dither
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United States of America Patent
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Sep 20, 1988
Grant Date -
N/A
app pub date -
Aug 12, 1987
filing date -
Aug 12, 1987
priority date (Note) -
Expired
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Abstract
Audio beat notes produced by sampling a square wave in a digital quadrature FM demodulator are reduced by adding filtered random noise, or dither, to the signal to be demodulated to randomly vary the width of successive pulses in the square wave. Filtration of the random noise prevents feedthrough of noise which would degrade the demodulated signal.
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