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Method and system for cross product enhanced subband block based harmonic transposition
Method and system for cross product enhanced subband block based harmonic transposition
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机译:基于叉积增强子带块的谐波换位方法和系统
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摘要
The invention provides an efficient implementation of cross-product enhanced high-frequency reconstruction (HFR), wherein a new component at frequencyΩ +Ωis generated on the basis of existing components at Ω and Ω + Ω. The invention provides a block-based harmonic transposition, wherein a time block of complex subband samples is processed with a common phase modification. Superposition of several modified samples has the net effect of limiting undesirable intermodulation products, thereby enabling a coarser frequency resolution and/or lower degree of oversampling to be used. In one embodiment, the invention further includes a window function suitable for use with block-based cross-product enhanced HFR. A hardware embodiment of the invention may include an analysis filter bank (101), a subband processing unit (102) configurable by control data (104) and a synthesis filter bank (103).
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