Patent ID: 7257535

Claim:
A system for processing an encoded audio signal having a number of frames, the system comprising: a decoder comprising: means for unquantizing at least three of a pitch period, a voicing probability, a mid-frame pitch period, and a mid-frame voicing probability of the audio signal; means for producing a spectral magnitude envelope and a minimum phase envelope; means for generating at least one control parameter using a signal-to-noise ratio computed using a gain and the voicing probability of the audio signal; means for analyzing the spectral magnitude envelope and the minimum phase envelope, wherein the spectral magnitude envelope and the minimum phase envelope are analyzed using the at least one control parameter and at least one of the unquantized pitch period, the unquantized voicing probability, the unquantized mid-frame pitch period, and the unquantized mid-frame voicing probability; and means for producing a synthetic speech signal corresponding to the input audio signal using the analysis of the spectral magnitude envelope and the minimum phase envelope.