To accurately specify a pitch cycle even if a sound signal includes harmonics.
In a cycle specifying device, a peak detection section 24 specifies the intensity LP of a positive side peak QP, and the intensity LM of a negative side peak QM of the sound signal A. An index calculation section 32 calculates a variation index value F[n] by adding an absolute value of a difference value of an average value of intensity LP[n-2] and intensity LP[n] from intensity LP[n-1], and an absolute value of a difference value of an average value of intensity LM[n-2] and intensity LM[n] from intensity LM[n-1]. When the variation index value F[n] is smaller than a threshold TH[n], the pitch cycle Tp of the sound signal A is specified by a cycle specifying section 44 by considering a positive side peak QP[n-1] and a negative side peak QM[n-1]. When the variation index value F[n] is larger than a threshold TH[n], the pitch cycle Tp of the sound signal A is specified by a cycle specifying section by neglecting the positive side peak QP[n-1] and the negative side peak QM[n-1].
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| JP4286405 | Signal analyzer and signal analysis method |
| JPH10116088 | EFFECT GIVING DEVICE |
| JP2007193903 | SOUND RECORDING DEVICE, SOUND RECORDING METHOD, AND PROGRAM |
KONDO TAKAYASU
| JPS61185800A | 1986-08-19 | |||
| JPH01101600A | 1989-04-19 | |||
| JPS60175099A | 1985-09-09 | |||
| JPS5479082A | 1979-06-23 |
Yashiro Hitoshi
Taro Takahashi