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

US20060020449A1Inactive Publication Date: 2006-01-26IKANOS COMMUNICATIONS
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
Publication Date
2006-01-26
Estimated Expiration
Not applicable · inactive patent

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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.
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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 ...

Examples

Embodiment Construction

[0127] The following description is intended to convey a thorough understanding of the invention by providing a number of specific embodiments and details involving VoDSL and VoIP applications. It is understood, however, that the invention is not limited to these specific embodiments and details, which are exemplary only. It is further understood that one possessing ordinary skill in the art, in light of known systems and methods, would appreciate the use of the invention for its intended purposes and benefits in any number of alternative embodiments, depending upon specific design and other needs.

[0128] According to an embodiment of the present invention, a low complexity spectrum estimation technique for comfort noise generation may be provided. A comfort noise generator (CNG) may be implemented to compress and reconstruct the silence part of speech signals. CNG may work with any voice activity detector, an echo canceller or other similar device to compress silence or generate co...