Extended response dynamic noise reduction system
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United States of America Patent
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-
Jan 9, 1990
Issued Date -
N/A
app pub date -
Nov 10, 1986
filing date -
Feb 25, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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