Gain control circuit for noise reduction system

Details Gain control circuit for noise reduction system Gain control circuit for noise reduction system

H - Electricity

04

B

330/105, 179/2

H04B 1/64 (2006.01) H03G 3/20 (2006.01) H03G 5/16 (2006.01) H03G 7/00 (2006.01) H03G 9/02 (2006.01) H03G 11/00 (2006.01)

Patent

CA 1147267

SO 1302 ABSTRACT A gain control circuit for an audio signal recorder includes a first transmission path having a variable gain amplifier for compressing an audio signal with a first gain characteristic in response to a first control voltage supplied thereto, a second transmission path having a variable gain amplifier for compressing the audio signal with a second gain characteristic different from the first gain characteristic in response to a second control voltage supplied thereto, a control circuit responsive to at least one of the compressed audio signals from the variable gain amplifiers for producing the control signals, and an adding amplifier for adding the compressed audio signals from the first and second transmission paths whereby the compressed audio signal from the first transmission path is effectively transmitted for recording when the level of the audio signal is below a predetermined value and the compressed audio signal from the second transmission path is effectively transmitted for recording when the level of the audio signal is above the predetermined value.

352682

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