Method and apparatus for providing background acoustic noise...

Details Method and apparatus for providing background acoustic noise... Method and apparatus for providing background acoustic noise...

H - Electricity

04

M

H04M 11/06 (2006.01) G10L 19/00 (2006.01) G10L 19/14 (2006.01) H04L 29/06 (2006.01)

Patent

CA 2275832

In a voice communication system, a method and apparatus for generating natural-quality synthetic noise to replace background acoustic noise during speech gaps achieve a better representation of the excitation signal in a noise-synthesis model by classifying the type of acoustic environment noise into one or more of a plurality of predefined noise classes. The noise class information is used to synthesize background noise that sounds similar to the actual background noise during speech transmission. In some embodiments, the noise class information is derived by the transmitter and transmitted to the receiver which selects corresponding excitation vectors and filters them using a synthesis filter to construct the synthetic noise. In other embodiments, the receiver itself classifies the background noise present in hangover frames and uses the class information as before to generate the synthetic noise. The improvement in the quality of synthesized noise during speech gaps helps to preserve noise continuity between talk spurts and speech pauses, and enhances the perceived quality of a conversation.

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