Method and apparatus for encoding speech

Details Method and apparatus for encoding speech Method and apparatus for encoding speech

1988-08-29

1990-04-03

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

G10L 500

Patent

active

049147013

ABSTRACT:
In a speech encoder a Fourier transform of the speech is provided. The Fourier transform is equalized by normalizing the spectrum coefficients to a curve which approximates the shape of the spectrum. Both the curve and the equalized spectrum are encoded. Preferably, only a baseband of the normalized spectrum is encoded and that baseband is repeated in the decoder. The spectrum is normalized by scaling different regions (subbands) of the spectrum differently to flatten the spectrum.

REFERENCES:
patent: 4241329 (1980-12-01), Bahler et al.
patent: 4330689 (1982-05-01), Kang et al.
patent: 4610022 (1986-09-01), Kitayama
R. Zelinski and P. Noll, "Adaptive Transform Coding of Speech Signals," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-25, No. 4, Aug. 1977.
B. N. Suresh Babu, "Performance of an FFT-Based Voice Coding System in Quiet and Noisy Environments," IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-31, No. 5, Oct. 1983, pp. 1323-1327.
James L. Flanagan et al., "Speech Coding", IEEE Transactions on Communications, vol. Com-27, No. 4, pp. 710-736, Apr. 1979.
Kang et al., "Mediumband Speech Processor with Baseband Residual Spectrum Encoding", Proceedings 1981 IEEE, International Conference on Acoustics, Speech and Signal Processing, pp. 820-823.

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