Signal processing circuit in an audio device

Details Signal processing circuit in an audio device Signal processing circuit in an audio device

1992-07-16

1993-10-19

Isen, Forester W.

Electrical audio signal processing systems and devices

Including amplitude or volume control

Automatic

381106, 333 14, H03G 300

Patent

active

052553256

ABSTRACT:
A signal processing circuit in an audio device includes a variable gain control section for providing a variable amplification gain to an input signal in response to a gain control signal, an input signal level detecting section for detecting a level of the input signal and for generating a corresponding detection signal, and a time constant setting section for storing a plurality of time constant tables. Each one of the plurality of time constant tables includes a set of input signal delay characteristics corresponding to a predetermined level of the input signal. A time constant selecting section selects one of the plurality of time constant tables in the time constant setting section in response to the detection signal. The gain control signal is determined by the selected one of the plurality of time constant tables and the amplification gain of the variable gain control section is varied according to the selected one of the plurality of time constant tables.

REFERENCES:
patent: 4628529 (1986-12-01), Borth et al.

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