Adaptive filter pitch extraction
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United States of America Patent
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Apr 3, 2012
Grant Date -
Nov 10, 2011
app pub date -
May 11, 2011
filing date -
Oct 26, 2004
priority date (Note) -
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Abstract
An enhancement system extracts pitch from a processed speech signal. The system estimates the pitch of voiced speech by deriving filter coefficients of an adaptive filter and using the obtained filter coefficients to derive pitch. The pitch estimation may be enhanced by using various techniques to condition the input speech signal, such as spectral modification of the background noise and the speech signal, and/or reduction of the tonal noise from the speech signal.
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