Dolby International Ab

Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Coding Technologies Ab

Coding Technologies Sweden Ab

Koninklijke Philips Corporation N.v.

Dolby Laboratories Licensing Corporation

Disch, Sascha

Per Ekstrand

Lars Villemoes

Heiko Purnhagen

Kristofer Kjoerling

Lars Gustaf Liljeryd

Fredrik Henn

Kristofer Kjörling

Holger Hoerich

Sascha Disch

Frederik Nagel

Stephan Wilde

Per Hedelin

Holger Hörich

Lars Falck Villemoes

Frederik Henn

Erik Gosuinus Petrus Schuijers

Fransiscus Marinus Jozephus De Bont

Alan Jeffrey Seefeldt

C Phillip Brown

Harald Mundt

Jeroen Koppens

Robin Thesing

Nicholas Luke Appleton

Klaus Peichl

Xuemei Yu

Yuxing Hao

Kristofer Kjoerlink

Stefan Wilde

Villemoes Lars Falck,

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.

Backward-compatible integration of high frequency reconstruction techniques for audio signals

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.

Integration of high frequency audio reconstruction techniques

An apparatus for processing an input audio signal relies on a cascade of filterbanks, the cascade having a synthesis filterbank for synthesizing an audio intermediate signal from the input audio signal, the input audio signal being represented by a plurality of first subband signals generated by an analysis filterbank, wherein a number of filterbank channels of the synthesis filterbank is smaller than a number of channels of the analysis filterbank. The apparatus furthermore has a further analysis filterbank for generating a plurality of second subband signals from the audio intermediate signal, wherein the further analysis filterbank has a number of channels being different from the number of channels of the synthesis filterbank, so that a sampling rate of a subband signal of the plurality of second subband signals is different from a sampling rate of a first subband signal of the plurality of first subband signals.

Apparatus and method for processing an input audio signal using cascaded filterbanks

Backward-compatible integration of harmonic transposer for high frequency reconstruction of audio signals

Integration of high frequency reconstruction techniques with reduced post-processing delay

Embodiments relate to an audio processing unit that includes a buffer, bitstream payload deformatter, and a decoding subsystem. The buffer stores at least one block of an encoded audio bitstream. The block includes a fill element that begins with an identifier followed by fill data. The fill data includes at least one flag identifying whether enhanced spectral band replication (eSBR) processing is to be performed on audio content of the block. A corresponding method for decoding an encoded audio bitstream is also provided.

Decoding audio bitstreams with enhanced spectral band replication metadata in at least one fill element

The present disclosure provides methods, devices and computer program products for non-uniform quantization of parameters. The disclosure further relates to a method and apparatus for reconstructing an audio object in an audio decoding system taking the non-uniformly quantized parameters into account. According to the disclosure, such an approach renders it possible to reduce bit consumption without substantially reducing the quality of the reconstructed audio object.

Method and apparatus for audio decoding based on dequantization of quantized parameters

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Saltsjobaden, Sweden

Per Ekstrand