Time warped modified transform coding of audio signals
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United States of America Patent
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Sep 16, 2014
Grant Date -
Aug 22, 2013
app pub date -
Feb 14, 2013
filing date -
Nov 3, 2005
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Abstract
A representation of an audio signal having a first, a second and a third frame is derived by estimating first warp information for the first and second frames and second warp information for the second and third frames, the warp information describing pitch information of the audio signal. First or second spectral coefficients for first and second frames or second and third frames are derived using first or second warp information and a first or second weighted representation of the first and second frames or second and third frames, the first or second weighted representation derived by applying a first or second window function to the first and second frames or second and third frames, wherein the first or second window function depends on the first or second warp information. The representation of the audio signal is generated including the first and the second spectral coefficients.
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