Patent ID: 6523002
Filing Date: 2003-02-18
Classification: G10L

Abstract:
A speech codec having a pitch track coding circuitry that operates on a speech signal, the pitch track coding circuitry of the speech codec comprising:a pitch lag selection circuitry that selects an end-of-frame pitch lag, the end-of-frame pitch lag is selected from a speech frame of the speech signal, the pitch lag selection circuitry determines a global pitch track for the speech fame using the end-of-frame pitch lag; a residual modification and warping circuitry that adjusts a local pitch track of the speech frame on a speech sub-fame basis; and wherein the speech signal comprises a plurality of speech frames, each speech frame of the plurality of speech frames contains a plurality of speech sub-frames, each speech sub-frame of the plurality of speech sub-frames has a corresponding pitch lag, the residual modification and warping circuitry adjusts at least one of the corresponding pitch lags.