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The waveform coding techniques are concerned with simply preserving the waveform shape of speech signal through a redundancy reduction process. In the case of speech synthesis, the waveform coding with high quality are mainly used to the synthesis by analysis. However, since the parameters of this coding are not classified into either excitation or vocal tract parameters, it is difficult to applying the waveform coding to the synthesis by rule. In order to applying the waveform coding to the synthesis by rule, the pitch alteration technique is required in prosody control. In this paper, we propose a new pitch alteration method that can change the pitch period in waveform coding by scaling the time-axis and compensating the spectrum. This is a kind of timefrequency domain methods where the phase components of the waveform are preserved with a little spectrum distortion of 2.5

On A Speech Synthesis Technique with High Quality by the Pitch Alteration of Speech Waveform