Patent ID: 6594631
Filing Date: 2003-07-15
Classification: G10L

Abstract:
A method for forming phoneme data in a voice synthesizing apparatus for obtaining a voice waveform signal by filtering-processing a frequency signal by filter characteristics according to the phoneme data, comprising the steps of:separating voice samples for every phoneme; obtaining a linear predictive coding coefficient by performing a linear predictive coding analysis to said phoneme, setting said linear predictive coding coefficient to temporary phoneme data, obtaining a linear predictive coding Cepstrum based on said linear predictive coding coefficient, and setting said linear predictive coding Cepstrum as a first linear predictive coding Cepstrum; obtaining a linear predictive coding Cepstrum by performing said linear predictive coding analysis to each of said voice waveform signals obtained by said voice synthesizing apparatus while changing a frequency of said frequency signal step by step, with a filter characteristic of said voice synthesizing apparatus being set to a filter characteristic according to said temporary phoneme data, and setting said linear predictive coding Cepstrum as a second linear predictive coding Cepstrum; obtaining an error between said first linear predictive coding Cepstrum and said second linear predictive coding Cepstrum as a linear predictive coding Cepstrum distortion; classifying each phoneme in a phoneme group belonging to a same phoneme name in each of said phonemes into a plurality of groups for every phoneme length; and selecting an optimum phoneme based on said linear predictive coding Cepstrum distortion from said group every said group and setting said temporary phoneme data corresponding to the selected phoneme to said phoneme data.