Dolby International Ab

Dolby Laboratories Licensing Corporation

Coding Technologies Ab

Sk Telecom Company, Ltd.

Dobly International Ab

Koninklijke Philips Electronics N.v.

Dolby Sweden Ab

Holger Hoerich

Kristofer Kjoerling

Jeroen Koppens

Per Ekstrand

Jeffrey Charles Riedmiller

Alan Jeffrey Seefeldt

Alexander Groeschel

Michael Schug

Alexander Stahlmann

Christof Fersch

Tobias Friedrich

Karsten Linzmeier

Jens Popp

Martin Wolters

Wolfgang Alexander Schildbach

Andreas Schneider

Tobias R Wagenblass

Andreas Ehret

Malte Schmidt

Michael Donald Hoffmann

Marvin Pribadi

Heiko Purnhagen

Michael C Ward

Matthias Neusinger

Leif Jonas Samuelsson

Karl Jonas Roeden

Thomas Ziegler

Gerard Herman Hotho

Claus-Christian Spenger

Daniel Homm

Stanislaw Gorlow

Kurt Krauss

Reinhold Boehm

Erik G P Schuijers

Celine Merpillat

Marc Roessler

Tobias Mueller

Oliver Watzke

Wolfgang A Schildbach

Jenns Popp

Karl J Roeden

Hans M Kjoerling

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

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

An audio bitstream is decoded into audio objects and audio metadata for the audio objects. The audio objects include a specific audio object. The audio metadata specifies frame-level gains that include a first gain and a second gain respectively for a first audio frame and a second audio frame. It is determined, based on the first and second gains, whether sub-frame gains are to be generated for the specific audio object. If so, a ramp length is determined for a ramp used to generate the sub-frame gains for the specific audio object. The ramp of the ramp length is used to generate the sub-frame gains for the specific audio object. A sound field represented by the audio objects with the sub-frame gains is rendered by audio speakers.

Main-associated audio experience with efficient ducking gain application

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.

Dialogue enhancement of an audio signal, comprising obtaining a set of time-varying parameters configured to estimate a dialogue component present in said audio signal, estimating the dialogue component from the audio signal, applying a compressor only to the estimated dialogue component, to generate a processed dialogue component, applying a user-determined gain to the processed dialogue component, to provide an enhanced dialogue component. The processing of the estimated dialogue may be performed on the decoder side or encoder side. The invention enables an improved dialogue enhancement.

Dialogue enhancement in audio codec

The present document describes a method () for personalizing audio content. The method () comprises receiving () a manifest file () for the audio content. The manifest file () comprises at least one adaptation set () referencing an audio bitstream (), where the audio bitstream () comprises a plurality of audio objects (), and a plurality of different preselection elements () for the adaptation set (), wherein the different preselection elements () specify different combinations of the plurality of audio objects (). The method () further comprises selecting () a preselection element () from the plurality of different preselection elements (), and causing () rendering of an audio signal which depends on the selected preselection element ().

Methods and devices for personalizing audio content

Methods for generating an AV bitstream (e.g., an MPEG-2 transport stream or bitstream segment having adaptive streaming format) such that the AV bitstream includes at least one video I-frame synchronized with at least one audio I-frame, e.g., including by re-authoring at least one video or audio frame (as a re-authored I-frame or a re-authored P-frame). Typically, a segment of content of the AV bitstream which includes the re-authored frame starts with an I-frame and includes at least one subsequent P-frame. Other aspects are methods for adapting such an AV bitstream, audio/video processing units configured to perform any embodiment of the inventive method, and audio/video processing units which include a buffer memory which stores at least one segment of an AV bitstream generated in accordance with any embodiment of the inventive method.

Frame conversion for adaptive streaming alignment

Described herein is a method for processing of media data for playback, wherein the method includes the steps of: (a) fetching, by a web proxy, from two or more media servers media data and a media manifest file including metadata information relating to the fetched media data, and merging, by the web proxy, the media data; (b) modifying, by said web proxy, the content of the media manifest file and/or the content of the media data; and (c) providing, by said web proxy, the media manifest file and the media data as modified in step (b) to a media retrieval element for receiving and processing the media manifest file and the media data for decoding or playback, wherein a localhost address is assigned to the web proxy and the web proxy acts as a server for said media retrieval element. Described are further a respective device and computer program product.

Method and device for personalization of media data for playback

The present invention proposes a new method and a new apparatus for enhancement of audio source coding systems utilising high frequency reconstruction (HFR). It utilises a detection mechanism on the encoder side to assess what parts of the spectrum will not be correctly reproduced by the HFR method in the decoder. Information on this is efficiently coded and sent to the decoder, where it is combined with the output of the HFR input.

Methods for improving high frequency reconstruction

The present document describes a method for allocating bits to a frame of a sequence of frames to yield a bitstream having a constant average bitrate, wherein the frame comprises audio data and metadata. The method comprises maintaining an overall bit reservoir and maintaining a virtual bit reservoir being a subset of the overall bit reservoir, such that bits for the metadata of the frame are allocated from the virtual bit reservoir and such that bits for the audio data of the frame are allocated from the overall bit reservoir.

Method and system for bit reservoir control in case of varying metadata

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Fürth, Germany

Holger Hoerich