Telephone system and voice encoding/decoding method

Details Telephone system and voice encoding/decoding method Telephone system and voice encoding/decoding method

1997-04-11

2000-07-04

Vo, Nguyen

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

455 82, 455134, 455570, 370286, 379406, H04B 144

Patent

active

060850728

ABSTRACT:
A telephone system and a voice encoding/decoding method capable of reducing the consumed power by reducing the memory capacity of buffer and generating high-tone-quality voice. The system writes an input voice frame to an input buffer and eliminates the delayed disturbance in a voice signal from the input voice frame based on the output voice frame to execute echo-canceling, and decodes the received voice packet data, so that the boundary of input voice frames can be set before the boundary of output voice frames, at least, for the time necessary for the echo-canceling and decoding. Thereby, the output voice frame can always be written at the same time as the input voice frame written to the input buffer and the delayed disturbance in the voice signal can be eliminated from the input voice frame based on the output voice frame and, thus the high-tone-quality voice can be generated.

REFERENCES:
patent: 4513412 (1985-04-01), Cox
patent: 5170490 (1992-12-01), Cannon et al.
patent: 5276914 (1994-01-01), Ishizuka et al.

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