Title: Audio compressor/limiter amplifier

Abstract: An audio compressor amplifier including an operational amplifier with compressor means connected from the output to the input for compressing signals at the output to a predetermined constant level in a predetermined attack time and including a plurality of diodes connected to reduce the series resistance in the compressor means for decreasing the attack time when the output signal exceeds the predetermined constant level by a predetermined amount, and a gain control feedback resistor connected from the output to the input of the operational amplifier and including a second resistor and a plurality of diodes connected in parallel therewith to reduce the gain of the operational amplifier and provide peak limiting action when a signal at the output exceeds a predetermined value in excess of the predetermined constant level.

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Inventors: Campbell, Whitney Robertson (Elk Grove Village, IL, US)
Fardoux, Raymond Maurice (Wilmette, IL, US)

Application Number: 591388
Filing Date: 1975-06-30
Publication_date: 1976-10-12
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Class(es): 333/14 327/309, 327/312, 327/330, 330/141, 330/145, 330/278
Other Classes:
US Patent Ref:

3021489	Feb, 1962	Nielsen	330/141.
3576451	Apr, 1971	Markow	307/237.
3790896	Feb, 1974	Shimizu et al.	330/29.

Other Refs:
Primary Examiner: Zazworsky, John
Assistant Examiner:
Attorney: Gillman; James W., Parsons; Eugene A., Lee; Sang Ki