Speech encoder

Details Speech encoder Speech encoder

1991-06-27

1993-01-05

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 35, 381 45, G10L 500

Patent

active

051777991

ABSTRACT:
A speech encoder is disclosed, in which, of the DCT coefficients after the discrete cosine transformation, a coefficient which has a large absolute value and exerts great influence on the tone quality is selected and encoded and zeros are inserted into the other unselected coefficients, so that selective encoding is carried out which does not seriously deteriorate the tone quality even when the coding rate is 8 kbps or below. In another arrangement, about three to 16 different selection patterns (vector patterns per frame) are used for the selective coding and a pattern which minimizes the coding error is selected and encoded to ensure optimum coding.

REFERENCES:
patent: 4227176 (1980-10-01), Moshier
patent: 4991213 (1991-02-01), Wilson

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