Efficient combined harmonic transposition

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United States of America Patent

PATENT NO 11935508
APP PUB NO 20230245637A1
SERIAL NO

18194414

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Abstract

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The present document relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR), and to digital effect processors, e.g. so-called exciters, where generation of harmonic distortion adds brightness to the processed signal. In particular, a system configured to generate a high frequency component of a signal from a low frequency component of the signal is described. The system may comprise an analysis filter bank (501) configured to provide a set of analysis subband signals from the low frequency component of the signal; wherein the set of analysis subband signals comprises at least two analysis subband signals; wherein the analysis filter bank (501) has a frequency resolution of Δf. The system further comprises a nonlinear processing unit (502) configured to determine a set of synthesis subband signals from the set of analysis subband signals using a transposition order P; wherein the set of synthesis subband signals comprises a portion of the set of analysis subband signals phase shifted by an amount derived from the transposition order P; and a synthesis filter bank (504) configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein the synthesis filter bank (504) has a frequency resolution of FΔf; with F being a resolution factor, with F≥1; wherein the transposition order P is different from the resolution factor F.

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Patent Owner(s)

Patent OwnerAddress
DOLBY INTERNATIONAL ABAPOLLO BUILDING 3E HERIKERBERGWEG 1-35 AMSTERDAM ZUIDOOST 1101 CN

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ekstrand, Per Saltsjobaden, SE 189 2649
Hedelin, Per Gothenburg, SE 40 550
Villemoes, Lars Järfälla, SE 319 4507

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