PITCH CONVERTING APPARATUS

摘要

A pitch converting apparatus detects peak spectra (P1,P2) from the amplitude spectrum of an input sound. The pitch converting apparatus compresses or decompresses an amplitude spectrum distribution (AM1) of a first frequency range (A1) including a first frequency (f1) of the peak spectrum (P1) by use of a pitch conversion ratio, which is to maintain the shape of the amplitude spectrum distribution (AM1), to obtain an amplitude spectrum distribution (AM10) of a first frequency range (A10) as pitch converted. The pitch converting apparatus similarly compresses or decompresses an amplitude spectrum distribution (AM2) in the vicinity of the peakspectrum (P2) to obtain an amplitude spectrum distribution (AM20). The pitch converting apparatus compresses or decompresses an amplitude spectrum of an intermediate frequency range (A3) between the peak spectra (P1,P2) by use of a predetermined pitch conversion ratio in accordance with the frequencies of the amplitude spectra, thereby performing a pitch conversion.