| 摘要 |
PROBLEM TO BE SOLVED: To provide a voice converter in which sound quality decrease of a waveform signal in an attenuation type musical instrument is small with respect to a technique of time stretch (rate conversion) and pitch shift (pitch conversion) of a music piece.SOLUTION: A voice converter is configured such that: polar conversion of a complex signal output per frequency bandwidth from a filter bank part is performed to obtain an amplitude signal and a phase signal; an amplitude interpolation unit 204 performs interpolation operation processing to the amplitude signal to obtain the interpolated signal, and signal processing is performed to the phase signal to obtain the processed phase signal; and a waveform signal per frequency bandwidth is reconstructed using the interpolated signal and the processed phase signal to combine the reconstructed output, and output the waveform signal to which time stretch or pitch shift is applied. The amplitude interpolation unit 204 performs interpolation operation processing per frequency bandwidth to the amplitude signal by a processing unit selected by a user from a linear interpolation unit 405 and a logarithmic interpolation unit 406. |
