Compressors, expanders and noise reduction systems

Details Compressors, expanders and noise reduction systems Compressors, expanders and noise reduction systems

1974-12-20

1976-07-27

Gensler, Paul L.

Wave transmission lines and networks

Amplitude compression and expansion systems

H04B 164

Patent

active

039720101

ABSTRACT:
A signal processing system for providing compressor and expander operation which system includes a main, or straight through, signal path and a further signal path in parallel therewith. The further path derives its input from the input to the main path or from some later point in the signal path. The output of the further signal path is combined additively with that of the main path for compressor operation and subtractively for expander operation, such further signal path output being appropriately limited so that it can only make a noticeable contribution to the resultant signal level at low input signal levels. True complementarity is attainable by the use of a compressor and expander together to provide an overall noise reduction action without introducing defects into the signal being processed.

REFERENCES:
patent: 3729693 (1973-04-01), Dolby

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