Patent ID: 6993484

Claim:
A method of synthesizing speech comprising: a magnification acquisition step of obtaining, on the basis of target power of synthesized speech, a first magnification to be applied to sub-phoneme units of a voiced portion and a second magnification to be applied to sub-phoneme units of an unvoiced portion, wherein said first magnification is different from said second magnification; a limitation step of obtaining a third magnification by limiting data range of said second magnification, wherein said second magnification is compared with threshold; an extraction step of extracting sub-phoneme units from a phoneme to be synthesized; an amplitude altering step of altering amplitude of a sub-phoneme unit of a voiced portion, by applying the first magnification to speech waveform of the sub-phoneme unit, from among the sub-phoneme units extracted at said extraction step, and altering amplitude of a of a sub-phoneme unit of an unvoiced portion, from among the sub-phoneme units extracted at said extraction step, by applying the third magnification to speech waveform of the sub-phoneme unit; and a synthesizing step of obtaining synthesized speech using the sub-phoneme units processed at said amplitude altering step.