Patent ID: 7672835
Filing Date: 2010-03-02
Classification: G10L

Abstract:
1. A voice analysis/synthesis apparatus that analyses a first voice waveform and synthesizes a second voice waveform using a result of the analysis, the apparatus comprising: a frequency analyzing unit for analyzing frequencies of the first voice waveform in units of a frame and for extracting a frequency component for each frequency channel; a phase calculating unit for calculating a phase difference in a frame between the first and second voice waveforms, the frame preceding a present frame by a predetermined number of frames, wherein the phase difference is calculated based on a quantity of change in a phase between the first and second voice waveforms and having occurred while the first and second voice waveforms moved from a first frame to the preceding frame, with a predetermined one of the frequency channels as a standard, and based on a quantity of change in the phase between the first and second voice waveforms and having occurred while the first and second voice waveforms moved from the preceding frame to the present frame, and wherein the phase calculating unit is also for calculating a phase of the second voice waveform in the present frame by referring to the frequency components each extracted by the frequency analyzing unit for a respective frequency channel, and by using the phase difference; and a voice synthesizing unit for: (i) extracting a formant of the first voice waveform from the frequency components each extracted from the respective frequency channel by the frequency analyzing unit, (ii) operating the extracted frequency components to shift the extracted formant, (iii) converting the frequency component for each frequency channel in accordance with the phase calculated by the phase calculating unit, and (iv) synthesizing the second voice waveform in units of a frame, using the converted frequency components.