Data processing: speech signal processing – linguistics – language – Speech signal processing – Recognition
Patent
1997-09-18
1998-06-30
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
Recognition
704219, 704233, 704239, G10L 914
Patent
active
057748470
ABSTRACT:
In methods and apparatus for distinguishing stationary signals from non-stationary signals, a set of Linear Predictive Coding (LPC) coefficients characterizing spectral properties of the signal for each of a plurality of successive time intervals, including a current time interval, is determined. The LPC coefficients are averaged over a plurality of successive time intervals preceding the current time interval, and a cross-correlation of the LPC coefficients for the current time interval with the averaged LPC coefficients is determined. The signal is declared to be stationary in the current time interval when the cross-correlation exceeds a threshold value, and is declared to be non-stationary in the current time interval when the cross-correlation is less than the threshold value. The methods and apparatus are particularly applicable to detection of transitions between an absence of speech state, characterized by a stationary signal, and a presence-of-speech state characterized by a non-stationary signal.
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Chu Chung Cheung
Rabipour Rafi
Hudspeth David R.
Junkin C. W.
Northern Telecom Limited
Smits Talivaldis Ivars
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