Speech coding device for estimating an error of power envelopes

Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission

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704211, 704261, 704264, G10L9/00

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059059702

ABSTRACT:
In a speech coding device for coding an input speech with an AbS (Analysis by Synthesis) system and one of a forward type and a backward type configuration, a vocal tract prediction coefficient generating circuit produces a vocal tract prediction coefficient from one of an input speech signal and a locally reproduced synthetic speech signal. A speech synthesizing circuit produces a synthetic speech signal by using codes stored in an excitation codebook in one-to-one correspondence with indexes, and the vocal tract prediction coefficient. A comparing circuit compares the synthetic speech signal and input speech signal to thereby output an error signal. A perceptual weighting circuit weights the error signal to thereby output a perceptually weighted signal. A codebook index selecting circuit selects an optimal index for the excitation codebook out of at least the weighted signal, and feeds the optimal index to the excitation codebook. A power envelope estimating circuit produces power envelope signals from the synthetic speech signal and input speech signal, and compares the power envelope signals to thereby estimate an error signal representative of a difference between the envelope signals. The codebook index selecting circuit selects the optimal index on the basis of the error signal and weighted signal. The device is capable of reproducing a synthetic speech faithfully matching an input original speed signal without deteriorating perceptual naturalness.

REFERENCES:
patent: 5396576 (1995-03-01), Miki
patent: 5602959 (1997-02-01), Bergstrom
patent: 5659658 (1997-08-01), Vanska
Thomas Parsons "voice and speech processing" pp. 191-200, 1986.
Atal, B.S. "High-Quality Speech at Low Bit Rates: Multi-Pulse and Stochastically Excited Linear Predictive Coders". ICASSP 86 Proceedings. IEEE-IECEJ-ASJ International Conference on Acoustics, Speech and Signal Processing (Cat. No. 86CH2243-4), Tokyo Japan, Apr. 7-11, 1986. IEEE, New York, NY, USA pp. 1681-1684 vol. 3, XP002071240.
"High-Quality Speech at Low Bit Rates: Multi-Pulse and Stochastically Excited Linear Predictive Coders", B.S. Atal, Proc. ICASSP, 1986, pp. 1681-1684.

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