Integration of high frequency audio reconstruction techniques

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United States of America Patent

PATENT NO 11810591
APP PUB NO 20230197102A1
SERIAL NO

18113397

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Abstract

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A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag. The high frequency regeneration is performed as a post-processing operation with a delay of 3010 samples per audio channel.

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Patent Owner(s)

  • DOLBY INTERNATIONAL AB

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ekstrand, Per Saltsjöbaden, SE 168 2381
Kjoerling, Kristofer Solna, SE 192 1587
Purnhagen, Heiko Sundbyberg, SE 274 3344
Villemoes, Lars Järfälla, SE 291 4057

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