Abstract
To conduct pitch control of a voiced speech signal that is to be coded or decoded, the voiced signal is subjected to sinusoidal analysis coding for each coding unit obtained by dividing the voiced signal on the time axis at a predetermined coding unit. A linear predictive residual of the voiced signal is taken out, and resultant voiced signal coded data are processed. A pitch component of the voiced signal coded data coded by the sinusoidal analysis coding is altered without changing the phonemes by a predetermined computation processing in a pitch conversion unit.
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