System for coding voice signals to optimize bandwidth occupation

Details System for coding voice signals to optimize bandwidth occupation System for coding voice signals to optimize bandwidth occupation

1998-12-17

2000-08-15

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

704219, 370352, 370389, H04J 322, G10L 1908

Patent

active

061049980

ABSTRACT:
A system for coding voice signal to optimize bandwidth occupation in a High Speed Packet Switching network while ensuring best voice transmission quality.
The voice signal is first encoded using a conventional GSM like RPE/LTP coder providing first sub-frames of coded signal and tagging these first sub-frames as being non-discardable. In addition, a convenient difference between an RPE/LTP provided signal and a corresponding synthesized image is performed (see 36) and is also block encoded into second sub-frames which second sub-frames are tagged as being discardable sub-frames. Said second sub-frames when concatenated to corresponding first sub-frames provide so-called multirate frames. Then, when transmitting said multirate frames over the High Speed packet switching network, dropping discardable tagged data enables solution network congestion situations in any network node and at random with no significant disturbing effect over the voice communication operation.

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patent: 5751718 (1998-05-01), Yip et al.
patent: 6047007 (2000-04-01), Munday et al.

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