Transform speech signal coding with pitch controlled adaptive qu

Details Transform speech signal coding with pitch controlled adaptive qu Transform speech signal coding with pitch controlled adaptive qu

1978-08-25

1980-01-15

Morrison, Malcolm A.

G10L 100

Patent

active

041840496

ABSTRACT:
To improve the speech quality at lower bit rates within a digital communication system in which the coefficients of a frequency transform (e.g. discrete cosine transform) are adaptively encoded with adaptive quantization and adaptive bit-assignment, the adaptation is controlled by a short-term spectral estimate signal formed by combining the formant spectrum and the pitch excitation spectrum of the coefficient signals.

REFERENCES:
patent: 3681530 (1972-08-01), Manley et al.
patent: 4142071 (1979-02-01), Croisier et al.
R. Zelinski et al., "Adaptive Transform Coding of Speech Signals", IEEE, Trans. on Acoustics etc., Aug. 1977.

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