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Browse Prior Art Database

Pseudo Hangover Synthesis

IP.com Disclosure Number: IPCOM000041721D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Daugan, G: AUTHOR [+3]

Abstract

In a digital voice network wherein N conversations are to be transmitted over C equivalent channels (N>C), the channel assignments are based on voice activity detection. The channels are assigned to active sources only. In other words, silences are not transmitted. However, it is difficult to detect the end of a talk-spurt, because the voice activity does not stop instantaneously. To provide smooth restitution, the voice sources are still considered active after each talk-spurt during a "hangover" time. Such hangovers do, however, increase the load of the network. A solution is proposed here to minimize the hangover load by not transmitting any voice signal during the hangovers and substituting for it a pseudo hangover voice signal generated at the receiving end of the network.

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Pseudo Hangover Synthesis

In a digital voice network wherein N conversations are to be transmitted over C equivalent channels (N>C), the channel assignments are based on voice activity detection. The channels are assigned to active sources only. In other words, silences are not transmitted. However, it is difficult to detect the end of a talk- spurt, because the voice activity does not stop instantaneously. To provide smooth restitution, the voice sources are still considered active after each talk- spurt during a "hangover" time. Such hangovers do, however, increase the load of the network. A solution is proposed here to minimize the hangover load by not transmitting any voice signal during the hangovers and substituting for it a pseudo hangover voice signal generated at the receiving end of the network. The proposed solution deals with stopping voice transmission as soon as the voice source energy drops under the voice activity detection (VAD) level, and to synthesize the pseudo hangover. The synthesized voice is provided by an attenuated reconstruction of the received voice signal prior to VAD indicating the occurrence of a silence.

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