Speech enhancement system having dynamic gain control
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United States of America Patent
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May 24, 1988
Grant Date -
N/A
app pub date -
Jul 12, 1985
filing date -
Jul 12, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An arrangement for a speech enhancement processor which maintains the processed speech at a constant level regardless of large changes in the associated noise level. The composite speech and noise signal is applied to a first AGC circuit and then to a speech enhancement system which removes tonal, impulse, and wideband noises from the signal. The extracted noise power estimates are subtracted from the constant amplitude signal to provide a gain control signal value to which the gain of a second variable gain amplifier is inversely proportional. The amplifier multiplies the processed speech output from the enhancement system and, because of the variable gain control, provides an output speech signal having short-term amplitude levels which correspond to those of the input speech signal, and having a constant long-term amplitude level.
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