Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1996-02-20
1999-01-26
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704207, 704208, G10L 908
Patent
active
058647953
ABSTRACT:
An improved vocoder system and method for estimating pitch in a speech waveform. The vocoder receives digital samples of a speech waveform and generates a plurality of parameters based on the speech waveform, including a pitch parameter. The present invention comprises an improved method for estimating and correcting the pitch parameter using correlation techniques. The method comprises first performing a correlation calculation on a frame of the speech waveform, which produces one or more correlation peaks at respective numbers of delay samples. The vocoder then compares the one or more correlation peaks with a clipping threshold value. If a single peak at location P.sub.d is greater than the clipping threshold, then the vocoder performs additional calculations to ensure that this single correlation peak is not a second or higher multiple of the true pitch. In the preferred embodiment, the vocoder assumes the peak at location P.sub.d is a second multiple of the true pitch, and the vocoder searches for the true pitch at a first multiple of the peak location P.sub.d. If a peak is found at this first multiple, referred to as P.sub.d ', and certain other criteria are met, then the peak at location P.sub.d ' is presumed to be the true pitch. In this case, the pitch is set to the number of delay samples indicated by P.sub.d '. Thus the present invention more accurately disregards false peaks which are second or higher multiples of the true pitch.
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Abebe Daniel
Advanced Micro Devices , Inc.
Hood Jeffrey C.
Hudspeth David R.
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