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Efficient spectral envelope coding using variable time / frequency resolution and time / frequency switching
Efficient spectral envelope coding using variable time / frequency resolution and time / frequency switching
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机译:使用可变的时间/频率分辨率和时间/频率切换进行有效的频谱包络编码
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摘要
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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