Filterbank-based processing of speech signals
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United States of America Patent
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Issued Date -
Apr 5, 2007
app pub date -
Sep 30, 2005
filing date -
Sep 30, 2005
priority date (Note) -
Abandoned
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Abstract
A method for suppressing noise from a digital audio signal, the method comprising: obtaining the digital signal; dividing the digital audio signal into sub-bands of non-uniform frequency division essentially mitigate Bark scale, corresponding sub-band signals having downsampling ratios by which a frame rate of an audio encoder, expressed in a number of samples in each frame, is divisible; calculating coarse estimates of signal levels for the non-uniform sub-bands; calculating smoothed signal level estimates for the non-uniform sub-bands based on the coarse estimates; and combining the processed sub-band signals into a digital output signal.
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