Abstract
This paper proposes a new method of high-quality pitch modification by complex cepstrum analysis-synthesis algorithm (hereafter referred to as the CCAS algorithm). The algorithm of the new conversion method presented here is as follows: the complex cepstra obtained within each pitch-synchronized frame are divided into pitch components and other spectral components by using comb filters. The pitch pulses obtained by inverse transformation of the pitch components are equalized adaptively to zerophase, while the spectral components also are transformed inversely into unit responses in time-domain. This equalization makes the pitch components more impulsive, resulting in clear separation of the voice source from the vocal tract characteristics. Speech synthesis is performed by convoluting the phase-adjusted pitch pulses with the nit responses. The results of listening tests showed that the pitchmodified speech by the CCAS method subjectively retains as high quality as the original speech.
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