Extended response dynamic noise reduction system

Details Extended response dynamic noise reduction system Extended response dynamic noise reduction system

1986-11-10

1990-01-09

Gensler, Paul

Wave transmission lines and networks

Automatically controlled systems

381 98, 381106, H03H 701

Patent

active

048930997

ABSTRACT:
A noise reduction system compresses an input signal at a constant ratio in response to a control signal derived from the compressed signal. Added to the derived control signal is a counterfeit control signal which causes the compressor to mistrack when the compressed signal falls below a preselected threshold level. Thus, low level compressor output signals are increasingly deemphasized. A constant counterfeit control signal produces a logarithmic decrease in compressor output signal levels below the threshold point. The resulting compressed signal is used to enhance system noise reduction. The input signal is fed to a filter having a variable bandwidth controlled by a signal derived from the compressed signal and responsive to compressed signal frequency and amplitude so that the filter is desensitized to input signal amplitude changes. A multistage filter control signal arrangement may be employed to provide variable cutoffs in more than one bandwidth.

REFERENCES:
patent: 3885111 (1975-05-01), Ishigami et al.
patent: 4368435 (1983-01-01), Bloy
patent: 4696044 (1987-09-01), Waller, Jr.

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