Method and apparatus for injecting comfort noise in a communications system

Abstract

Background noise, optionally spectrally matched, is performed directly in a coded domain. A Coded Domain Spectrally Matched Noise Injection (CD-SMNI) system modifies at least one parameter of a first encoded signal, resulting in corresponding modified parameter(s). The CD-SMNI system replaces the parameter(s) of the first encoded signal with the modified parameter(s), resulting in a second encoded signal. In a decoded state, the second encoded signal approximates background noise in the first encoded signal in a decoded state. Thus, the first encoded signal does not have to go through intermediate decode/re-encode processes, which can degrade overall speech quality. Computational resources required for a complete re-encoding are not needed. Overall delay of the system is minimized. The CD-SMNI system can be used in any network in which signals are communicated in a coded domain, such as a Third Generation (3G) wireless network.

Dependencies are inferred from the claim text.