Noise reduction system
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United States of America Patent
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-
Apr 30, 1991
Issued Date -
N/A
app pub date -
Jan 5, 1990
filing date -
Dec 25, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Noise in a speech-plus-noise input signal is suppressed by splitting the input signal into spectral channels and decreasing the gain in the each channel which has a low signal-to-noise ratio (SNR). A voice operated switch (VOX) acts to detect noise-only input to gate a background noise (input signal) estimator and also to gate a residual noise (output signal) estimator. The gain in each of the channels is controlled by the current value (a posteriori) input signal SNR estimate, modified by the prior value (a priori) input signal SNR estimate, and smoothed as a function of the residual (output noise signal) estimate.
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