Voice coding-and-transmission system with silent period eliminat

Details Voice coding-and-transmission system with silent period eliminat Voice coding-and-transmission system with silent period eliminat

1997-03-26

1999-02-16

Dorvil, Richemond

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704230, G10L 300

Patent

active

058730583

ABSTRACT:
In a voice coding-and-transmission system using a differential coding, a degradation of voice quality caused by a silent period transmission network and an ATM network is prevented without improving a silent-period elimination transmission network and existing transmission networks such as a STM network. In a relay node 104, an encoder 114 codes a voice signal from a decoder 108 again for a transient period immediately after a voice is started, and a transmission node 100 and a reception node 102 are tandem-connected. The encoder 114 and a decoder 122 at a reception node 102 are given respectively same reference values of a differential processing by memories 118, 128 when the voice is started, thereby preventing an abnormal sound generation due to a mismatch of inner statuses thereof when the voice is started. During the transient period, the internal statuses of an encoder 106 at a reception node 100 and the decoder 122 are closed each other. After the transient period is elapsed, switching a switch in a silent-period eliminator 112 to a digital-one-link, thereby preventing the degradation of the voice quality caused by quantization errors.

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patent: 5475712 (1995-12-01), Sasaki
patent: 5539858 (1996-07-01), Sasaki et al.
patent: 5654964 (1997-08-01), Wake

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