Detecting voice activity
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United States of America Patent
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Mar 24, 1998
Grant Date -
N/A
app pub date -
Nov 20, 1995
filing date -
Nov 22, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method and apparatus for detecting voice activity in an audio signal, the method comprising computing the autocorrelation coefficients of the signal, identifying a first autocorrelation vector whose components comprise a first series of autocorrelation coefficients, identifying a second autocorrelation vector whose components comprise a second series of autocorrelation coefficients offset from the first series by a predetermined offset value, subtracting the first autocorrelation vector from the second autocorrelation vector to obtain a differentiation vector, and computing a norm of the differentiation vector, which differentiation vector norm represents a first indicator of voice activity.
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