Dolby International Ab

Dolby Laboratories Licensing Corporation

Koninklijke Philips Corporation N.V.

Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Dobly International Ab

Dolby Sweden Ag

Jeroen Koppens

Holger Hoerich

Kristofer Kjoerling

Alan Jeffrey Seefeldt

Jeffrey Charles Riedmiller

Leif Jonas Samuelsson

David Matthew Cooper

Alexander Stahlmann

Dirk Jeroen Breebaart

Scott Gregory Norcross

Heiko Purnhagen

Rhonda J Wilson

Alexander Groeschel

Lars Villemoes

Hannes Muesch

Per Ekstrand

Johannes Hilpert

Oliver Hellmuth

Jonas Engdegard

Jan Plogsties

Harald Mundt

Toni Hirvonen

Cornelia Falch

Jeroen Dirk Breebaart

Leonid Terentiev

Jeroen Breebaart

A method for decoding an encoded audio signal is described. The encoded audio signal may comprise a sequence of frames and may be indicative of a plurality of different dynamic range control (DRC) profiles for a corresponding plurality of different rendering modes. Different subsets of DRC profiles may be comprised within different frames. The method may comprise determining a first rendering mode from the plurality of different rendering modes; determining one or more DRC profiles from a subset of DRC profiles comprised within a current frame; determining whether at least one of the DRC profiles is applicable to the first rendering mode; selecting a default DRC profile as a current DRC profile, if none of the DRC profiles is applicable to the first rendering mode; wherein definition data of the default DRC profile is known at a decoder; and decoding the current frame using the current DRC profile.

Efficient DRC profile transmission

Methods for dialogue enhancing audio content, comprising providing a first audio signal presentation of the audio components, providing a second audio signal presentation, receiving a set of dialogue estimation parameters configured to enable estimation of dialogue components from the first audio signal presentation, applying said set of dialogue estimation parameters to said first audio signal presentation, to form a dialogue presentation of the dialogue components; and combining the dialogue presentation with said second audio signal presentation to form a dialogue enhanced audio signal presentation for reproduction on the second audio reproduction system, wherein at least one of said first and second audio signal presentation is a binaural audio signal presentation.

Binaural dialogue enhancement

In an audio encoder, for audio content received in a source audio format, default gains are generated based on a default dynamic range compression (DRC) curve, and non-default gains are generated for a non-default gain profile. Based on the default gains and non-default gains, differential gains are generated. An audio signal comprising the audio content, the default DRC curve, and differential gains is generated. In an audio decoder, the default DRC curve and the differential gains are identified from the audio signal. Default gains are re-generated based on the default DRC curve. Based on the combination of the re-generated default gains and the differential gains, operations are performed on the audio content extracted from the audio signal.

Dynamic range control for a wide variety of playback environments

A method for encoding an input audio stream including the steps of obtaining a first playback stream presentation of the input audio stream intended for reproduction on a first audio reproduction system, obtaining a second playback stream presentation of the input audio stream intended for reproduction on a second audio reproduction system, determining a set of transform parameters suitable for transforming an intermediate playback stream presentation to an approximation of the second playback stream presentation, wherein the transform parameters are determined by minimization of a measure of a difference between the approximation of the second playback stream presentation and the second playback stream presentation, and encoding the first playback stream presentation and the set of transform parameters for transmission to a decoder.

Audio encoding and decoding using presentation transform parameters

A method () for decoding an encoded audio signal () is described. The encoded audio signal () comprises a sequence of frames. Furthermore, the encoded audio signal () is indicative of a plurality of different dynamic range control (DRC) profiles for a corresponding plurality of different rendering modes. Different subsets of DRC profiles from the plurality of DRC profiles are comprised within different frames of the sequence of frames, such that two or more frames of the sequence of frames jointly comprise the plurality of DRC profiles. The method () comprises determining a first rendering mode from the plurality of different rendering modes; determining () one or more DRC profiles from a subset of DRC profiles comprised within a current frame of the sequence of frames; determining () whether at least one of the one or more DRC profiles is applicable to the first rendering mode; selecting () a default DRC profile as a current DRC profile, if none of the one or more DRC profiles is applicable to the first rendering mode; wherein definition data of the default DRC profile is known at a decoder () for decoding the encoded audio signal (); and decoding the current frame using the current DRC profile.

This disclosure falls into the field of audio coding, in particular it is related to the field of providing a framework for providing loudness consistency among differing audio output signals. In particular, the disclosure relates to methods, computer program products and apparatus for encoding and decoding of audio data bitstreams in order to attain a desired loudness level of an output audio signal.

Transmission-agnostic presentation-based program loudness

Growing community of inventors

Nederweert, Netherlands

Jeroen Koppens