Patent ID: 8078474

Claim:
A method of signal processing, said method comprising performing each of the following acts within a device that is configured to process speech signals: encoding a low-frequency portion of a speech signal into at least an encoded narrowband excitation signal and a plurality of narrowband filter parameters; and generating a highband excitation signal based on the encoded narrowband excitation signal, wherein the encoded narrowband excitation signal describes a signal that is warped in time, with respect to the speech signal, according to a time-varying time warping, and wherein said method comprises, based on information relating to the time warping, applying a plurality of different time shifts to a corresponding plurality of successive portions in time of a high-frequency portion of the speech signal, and wherein said applying a plurality of different time shifts comprises calculating at least one of the plurality of different time shifts to account for differences between sampling rates of the low-frequency portion and the high-frequency portion.