Frequency bandwidth dependent exponential release for dynamic filter
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United States of America Patent
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Feb 20, 1996
Issued Date -
N/A
app pub date -
Jun 7, 1994
filing date -
Oct 9, 1991
priority date (Note) -
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Abstract
In a dynamic noise reduction system, the release time versus frequency bandwidth is exponentially related and well beyond that achievable with a simple RC circuit. A dc control signal is derived from an input audio frequency signal by peak detecting the input signal, filtering the peak detected signal and controlling the release time of the filtered signal so that its release time is fast when the frequency is within a predetermined high range, its release time is moderate when the frequency is within a predetermined intermediate range and its release time is slow when the frequency is within a predetermined low range.
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