Patent ID: 7912712

Claim:
An encoding method, comprising: extracting background noise characteristic parameters within a hangover period; for a first superframe after the hangover period, performing background noise encoding based on the extracted background noise characteristic parameters within the hangover period and background noise characteristic parameters of the first superframe, wherein the background noise encoding is performed by a process comprising, within a first frame and a second frame of the first superframe after the hangover period, extracting an autocorrelation coefficient of the corresponding first frame and second frame of the first superframe after the hangover period; and within the second frame of the first superframe after the hangover period, extracting an LPC filter coefficient and a residual energy E t of the first superframe based on the autocorrelation coefficients of the first frame and second frame and the extracted autocorrelation coefficients of the frames of the superframes within the hangover period; for superframes after the first superframe, performing a background noise characteristic parameter extraction and Discontinuous Transmission (DTX) decision for each frame in the superframes after the first superframe; and for the superframes after the first superframe, performing background noise encoding based on extracted background noise characteristic parameters of a current superframe, background noise characteristic parameters of a plurality of superframes previous to the current superframe, and a final DTX decision.