Predictive speech signal coding with reduced noise effects

Details Predictive speech signal coding with reduced noise effects Predictive speech signal coding with reduced noise effects

1978-04-07

1979-01-09

Claffy, Kathleen H.

179 1SA, G10L 100

Patent

active

041339762

ABSTRACT:
A predictive speech signal processor features an adaptive filter in a feedback network around the quantizer. The adaptive filter essentially combines the quantizing error signal, the formant related prediction parameter signals and the difference signal to concentrate the quantizing error noise in spectral peaks corresponding to the time-varying formant portions of the speech spectrum so that the quantizing noise is masked by the speech signal formants.

REFERENCES:
patent: 2927962 (1960-03-01), Cutler
patent: 3502986 (1970-03-01), Lucky
patent: 3631520 (1971-12-01), Atal
patent: 3740476 (1973-06-01), Atal
E. Kimme et al., "Synthesis of Optimal Filters for a Feedback Quantization System," IEEE Trans. Circuits, Sep., 1963.
H. Spang et al., "Reduction of Quantizing Noise by Feedback," IEEE Trans. Comm., Dec., 1962.

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