Method and system for generating colored comfort noise in the absence of silence insertion description packets

Abstract

A method and system for utilizing information content in speech and a transition hangover between speech and noise to generate comfort noise on the decoder side. This adaptation to noise may be accomplished using various algorithms of estimating the spectrum of color noise. According to an embodiment of the present invention, an adaptation algorithm may be implemented that adapts, with time, rather than a block based algorithm to prevent the repeated generation of artifacts present in the block that are being adapting to. The method and system of the present invention generates comfort noise in the absence of silent insertion descriptions containing spectrum information thereby saving bandwidth and generating colored comfort noise that reflects the spectrum of the actual noise.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority from provisional applications Ser. No. 60 / 297,265, filed Jun. 12, 2001 and Ser. No. 60 / 305,157, filed Jul. 16, 2001, which are incorporated by reference.FIELD OF THE INVENTION [0002] The present invention relates generally to enhancing bandwidth efficiency and to voice transmission and silence compression and, more particularly, for generating colored comfort noise in absence of silence insertion description packets containing spectrum information. BACKGROUND OF THE INVENTION [0003] Digital Subscriber Line (DSL, Digital Subscriber Loop, xDSL) involves a technology that enables high-speed transmission of digital data over traditional copper telephone lines. This technology involves digital telecommunications protocols designed to allow high-speed data communication over existing copper telephone lines between end-users and telephone companies. [0004] When two conventional modems are connected through the ...

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Benefits of technology

[0018] Aspects of the present invention overcome the problems noted above, and realize additional advantages. One such inventive aspect provides methods and systems for implementing a low complexity spectrum estimation technique for comfort noise generation. One aspect of this invention is the manner of estimating the signal spectrum and generating comfort noise (CN) with reduced complexity as compared to existing methods. Another aspect of this invention involves segregating filter parameter encoding from the adaptation process for transmission in the form of silence insertion descriptors. In systems where

Problems solved by technology

When the period of the pseudo-random generator is limited, as is often the case, this form of noise generation leads to periodic artifacts, especially when synt

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