Efficient spectral envelope coding using variable time/frequency resolution and time/frequency switching
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United States of America Patent
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Feb 20, 2007
Grant Date -
Feb 9, 2006
app pub date -
Oct 11, 2005
filing date -
Oct 1, 1999
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Abstract
The present invention provides a new method and an apparatus for spectral envelope encoding. The invention teaches how to perform and signal compactly a time/frequency mapping of the envelope representation, and further, encode the spectral envelope data efficiently using adaptive time/frequency directional coding. The method is applicable to both natural audio coding and speech coding systems and is especially suited for coders using SBR [WO 98/57436] or other high frequency reconstruction methods.
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