Method and apparatus for speech analysis and synthesis by sampli

Details Method and apparatus for speech analysis and synthesis by sampli Method and apparatus for speech analysis and synthesis by sampli

1994-06-08

1996-01-16

MacDonald, Allen R.

395 267, 395 223, G10L 900

Patent

active

054855438

ABSTRACT:
A method for speech analysis and synthesis for obtaining synthesized speech of a high quality includes the steps of determining a short-period power spectrum by performing an FFT operation on a speech wave, sampling the spectrum at the positions corresponding to the multiples of a basic frequency, applying a cosine polynomial model to the thus obtained sample points to determine the spectrum envelope thereat, then calculating the mel cepstrum coefficients from the spectrum envelope, and effecting speech synthesis, utilizing the mel cepstrum coefficients as the filter coefficients in a synthesizing (logarithmic mel spectrum approximation) filter.

REFERENCES:
patent: 4885790 (1989-12-01), McAulay
"Speech Analysis-Synthesis System and Quality of Synthesized Speech Using Mel-Cepstrum", T. Kitamura, Electronic and Communications of Japan, Part 1, vol. 69, No. 10, Oct. 1986, pp. 47-54.
"Cepstral Analysis Synthesis On The Mel Frequency Scale", S. Imai, ICASSP '83--IEEE International Conference on Acoustics, Speech and Signal Processing, Boston, Apr. 14-16, 1983, vol. 1, pp. 93-96.
"Estimation of Poles and Zeros of Voiced Speech Using Group Delay Characteristics Derived From Spectral Envelopes", N. Mikami, et al., Electronics and Communications in Japan, Part 1, vol. 69, No. 3, Mar. 1986, pp. 38-44.
"The Spectral Envelope Estimation Vocoder", D. Paul, IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-29, No. 4, Aug. 1981, pp. 786-794.

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