Pitch waveform signal generating apparatus, pitch waveform signal generation method and program
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United States of America Patent
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N/A
Issued Date -
Nov 4, 2004
app pub date -
Oct 22, 2003
filing date -
Aug 31, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A computer filters voice data and specifies a pitch length based on a timing at which a filtering result zero-crosses. A center frequency of a pass band in filtering is controlled to a value equivalent to a reciprocal of the pitch length specified based on the zero-cross timing as long as a deviation from a pitch length extracted from a cepstrum of voice data and periodogram does not exceed a predetermined amount. Next, the computer divides the voice data based on the filtering result to unit pitches of segments and sets phases and sample numbers of individual segments constant to remove an influence of fluctuation of the pitch. Then, the acquired pitch waveform data is interpolated by plural schemes and that which has fewer harmonic components is output together with data indicating the original sample number and amplitude of each segment.
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