Gain control circuit for noise reduction system

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

1980-05-19

1983-01-18

Konick, Bernard

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Including signal modification

360 25, 360 68, G11B 5027

Patent

active

043695094

ABSTRACT:
An input gain control circuit for an audio signal recorder includes a first transmission path for compressing an audio signal supplied thereto and having a variable gain amplifier and a control circuit which supplies a control signal to the variable gain amplifier for varying the gain thereof, a second transmission path for transmitting the audio signal with substantially unity gain through a resistor thereof, and an adding amplifier for adding the compressed audio signal from the first transmission path and the audio signal with substantially unity gain from the second transmission path whereby the compressed audio signal is effectively transmitted for recording when the level of the audio signal is below a predetermined value and the audio signal with substantially unity gain is transmitted for recording when the level of the audio signal is above the predetermined value. A complementary output gain control circuit substantially recreates the original audio signal when the above recorded signal is reproduced.

REFERENCES:
patent: 3206556 (1965-09-01), Bachman et al.
patent: 3379839 (1968-04-01), Bennett
patent: 3665345 (1972-05-01), Dolby
patent: 3729693 (1973-04-01), Dolby
patent: 4162462 (1979-07-01), Endoh et al.
patent: 4169219 (1979-09-01), Beard

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