Frequency bandwidth dependent exponential release for dynamic fi

Details Frequency bandwidth dependent exponential release for dynamic fi Frequency bandwidth dependent exponential release for dynamic fi

1994-06-07

1996-02-20

Isen, Forester W.

Electrical audio signal processing systems and devices

Including frequency control

381106, H03G 500

Patent

active

054936179

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.

REFERENCES:
patent: 4696044 (1987-09-01), Waller
patent: 5050217 (1991-09-01), Orban
National Semiconductor, AN-74, Jan. 1973, p. 16.

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