| 摘要 |
Of the acoustic signals held in a data-recording section 1, the input acoustic signal s1 (sampled for max. pitch cycle x 2) is read from the process-start position P. A low-pass filter 7 controls the high-band component of the acoustic signal s1. An decimation section 8 performs appropriate down-sampling on the signal output from the low-pass filter 7. The signal, thus down-sampled, is read into a signal buffer section 9. A down-sampled, input acoustic signal s2 is transferred from the signal buffer section 9 to a pitch-calculating section 3, which calculates a pitch cycle s3.
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