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Application filed by Долбі Інтернешнл АбfiledCriticalДолбі Інтернешнл Аб
Priority claimed from PCT/EP2011/065318external-prioritypatent/WO2012034890A1/en
Publication of UA105988C2publicationCriticalpatent/UA105988C2/en
Compression, Expansion, Code Conversion, And Decoders
(AREA)
Abstract
The invention provides an efficient implementation of cross-product enhanced high-frequency reconstruction (HFR), wherein a new component at frequency QΩ + Ωis generated on the basis of existing components at Ω and QΩ + 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 mi analysis filter bank (101), a subband processing unit (102) configurable by control data (104) and a synthesis filter bank (103).
UAA201304657A2010-09-162011-09-05Cross product enhanced subband block based harmonic transposition
UA105988C2
(en)