Patent ID: 9153240
Filing Date: 2015-10-06
Classification: G10L

Abstract:
1. A method for use in transform coding, comprising: obtaining an audio signal; obtaining a spectrum (Spe(p)) corresponding to at least a portion of said audio signal; mapping Spe(p) to a spectrum of perceptual sub-bands according to the following linear operation: where Bmax is an integer value not greater than 20 and the values of H b , T b and J b are defined in table 1 as: forward smoothing BSpe(b) according to: BSpe(b) =max (BSpe(b), BSpe(b-1)-4), b=1, . . . , Bmax; backward smoothing BSpe(b); after forward and backward smoothing, thresholding and renormalizing BSpe(b); and after thresholding and renormalizing BSpe(b), encoding at least a portion of the audio signal using BSpe(b).