Patent ID: 8812312

Claim:
A speech output system for outputting a speech captured with a microphone using a computer, the system comprising: a first means for performing analog-to-digital conversion on the speech captured with the microphone to output a digital speech signal; a second means for performing discrete Fourier transformation on the digital speech signal from the first means to output a power spectrum of the speech signal; a third means for receiving the power spectrum of the speech signal from the second means to generate a log power spectrum of the power spectrum; a fourth means for performing discrete cosine transformation on the log power spectrum from the third means; a fifth means for receiving an output from the fourth means to cut off cepstrum upper and lower terms of the output from the fourth means; a sixth means for receiving an output from the fifth means to perform inverse discrete cosine transformation on the output from the fifth means; a seventh means for converting an output from the sixth means so as to bring the output from the sixth means back to a power spectrum domain; an eighth means for filtering the power spectrum of the speech signal by using, as a filter, the output which is brought back to the power spectrum domain; a ninth means for receiving an output from the eighth means, after the filtering, and combining the output with the digital speech signal from the first means to perform an inverse discrete Fourier transformation to output a time domain speech signal; and a tenth means for performing digital-to-analog conversion on the output of the ninth means to output an analog speech signal; wherein the filtering is performed by multiplying the power spectrum of the speech signal by the output which is brought back to the power spectrum domain.