Method and apparatus for extracting speech pitch
First Claim
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1. A speech pitch extraction method for extracting a pitch period from peaks of correlation of a speech waveform, comprising the steps of:
- producing a plurality of pitch period candidates from peaks of correlation in a current frame from which a pitch period is to be extracted;
calculating an average of pitch period candidates from at least one past frame, said average being used as a guide index for a current frame; and
selecting as a pitch period for the current frame that one of said pitch period candidates which is closest to said guide index.
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Abstract
A plurality of pitch period candidates are selected from a peak of correlation of a speech waveform in a current frame from which a pitch period is to be extracted, and a speech pitch is selected from the candidates by referring to a guide index which is precalculated based on pitch periods extracted in past frames. The guide index is an average of the pitch periods in the past frames.
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Citations
7 Claims
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1. A speech pitch extraction method for extracting a pitch period from peaks of correlation of a speech waveform, comprising the steps of:
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producing a plurality of pitch period candidates from peaks of correlation in a current frame from which a pitch period is to be extracted; calculating an average of pitch period candidates from at least one past frame, said average being used as a guide index for a current frame; and selecting as a pitch period for the current frame that one of said pitch period candidates which is closest to said guide index. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification