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Abstract

A circuit automatically adjusts in response to an input audio signal to provide a dc control signal having the release characteristics of the input audio signal. The circuit has an input reference node for receiving a reference signal which is a function of the input signal, an output reference node for providing the dc control signal and an intermediate reference node between the input and output reference nodes. One or more diodes connected between the input and intermediate nodes permit forward conduction from the input node to the intermediate node. Components of a first signal path connected between the intermediate and output nodes provide a slow release time when the reference signal has a slow decay envelope. Components of a second signal path connected between the output and input nodes provide a fast release time when the reference signal has a fast decay envelope and cooperate with the first signal path components to provide a corresponding variable intermediate range of release times when the reference signal has a variable intermediate decay envelope. Components of a third signal path connected between the intermediate and output nodes permit forward conduction from the intermediate node to the output node to provide a fast attack time when the reference signal has a fast increase envelope and cooperate with the first signal path to provide a corresponding variable intermediate range of attack times when the reference signal has a variable intermediate increase envelope.

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First Claim