Circuit arrangements for modifying dynamic range using variable

Details Circuit arrangements for modifying dynamic range using variable Circuit arrangements for modifying dynamic range using variable

1986-06-12

1989-01-31

Mottola, Steven

Amplifiers

With plural amplifier channels

Amplifying different frequencies in different channels

333 14, H03F 368

Patent

active

048018902

ABSTRACT:
Circuits for modifying the dynamic range of signals, particularly compressors and expanders for use in noise reduction compander systems, in which the advantages of fixed band characteristics (variable attenuation throughout all or part of the frequency band) and sliding band characteristics (variable attenuation through part of the frequency band achieved by a variable pass filter) are provided, without the disadvantages normally inherent in each characteristic. The outputs of fixed band and sliding band circuit elements variably selected by a combining means operated by a control circuit which senses signal frequencies and/or levels, the elements operating in generally the same level range and at least a partial overlapping in frequency range.

REFERENCES:
patent: 3775705 (1973-11-01), Dolby
patent: 4701722 (1987-10-01), Dolby

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