Patent ID: 8412518

Claim:
An encoder for deriving a representation of an audio signal having a first frame, a second frame following the first frame, and a third frame following the second frame, the encoder comprising: a processor and a non-transitory computer storage medium having stored thereon instructions which, when executed by the processor, cause the processor to function as: a warp estimator for estimating first warp information for the first and the second frame and for estimating second warp information for the second frame and the third frame, the warp information describing a pitch information of the audio signal; a spectral analyzer adapted to derive first spectral coefficients for the first and the second frame using the first warp information and a first weighted representation of the first and the second frame, the first weighted representation derived by applying a first window function to the first and the second frames, wherein the first window function depends on the first warp information; the spectral analyzer further adapted to derive second spectral coefficients for the second and the third frame using the second warp information and a second weighted representation of the second and the third frame, the second weighted representation derived by applying a second window function to the second and the third frames, wherein the second window function depends on the second warp information; and an output interface for outputting the representation of the audio signal including the first and the second spectral coefficients.