Dolby International Ab

Dolby Laboratories Licensing Corporation

Creative Technology Corporation

Martin Wolters

Jeffrey Charles Riedmiller

Michael Schug

Harald Mundt

Michael M Goodwin

Carlos M Avendano

Ramkumar Sridharan

Christof Fersch

Heiko Purnhagen

Michael A Grant

Scott Gregory Norcross

Tobias Friedrich

Andreas Schneider

Jean-Marc Jot

Holger Hoerich

Robin Thesing

Alexander Groeschel

Jens Popp

Klaus Peichl

Michael C Ward

Karl Jonas Roeden

Karsten Linzmeier

Thomas Ziegler

Wolfgang Alexander Schildbach

Daniel Homm

Mark William Gerrard

Kurt Krauss

Reinhold Boehm

Yanning Bai

Oliver Watzke

Richard Han

Wolfgang A Schildbach

Jenns Popp

Harald H Mundt

A method of encoding audio content comprises performing a content analysis of the audio content, generating classification information indicative of a content type of the audio content based on the content analysis, encoding the audio content and the classification information in a bitstream, and outputting the bitstream. A method of decoding audio content from a bitstream including audio content and classification information for the audio content, wherein the classification information is indicative of a content classification of the audio content, comprises receiving the bitstream, decoding the audio content and the classification information, and selecting, based on the classification information, a post processing mode for performing post processing of the decoded audio content. Selecting the post processing mode can involve calculating one or more control weights for post processing of the decoded audio content based on the classification information.

Methods, apparatus and systems for dual-ended media intelligence

Many portable playback devices cannot decode and playback encoded audio content having wide bandwidth and wide dynamic range with consistent loudness and intelligibility unless the encoded audio content has been prepared specially for these devices. This problem can be overcome by including with the encoded content some metadata that specifies a suitable dynamic range compression profile by either absolute values or differential values relative to another known compression profile. A playback device may also adaptively apply gain and limiting to the playback audio. Implementations in encoders, in transcoders and in decoders are disclosed.

System and method for non-destructively normalizing loudness of audio signals within portable devices

The present document discloses a method for playback of media content via a delivery channel. The delivery channel may generally refer to the channels through which audio or video programs are delivered (transmitted) to the user (receiver). The media content may generally comprise consecutive media programs. In particular, for a specific media program within the media content, a respective content type for that specific media program is also provided. The method may comprise receiving an indication of the sensitivity of a media program to playback latency. The method may further comprise receiving at least a portion of the media program. The method may yet further comprise adapting the playback of the media program based on the indication of its sensitivity to playback latency.

Latency management for content delivery

A method for rendering an audio output based on an audio data stream including M audio signals, side information including a series of reconstruction instances of a reconstruction matrix C and first timing data, the side information allowing reconstruction of N audio objects from the M audio signals, and object metadata defining spatial relationships between the N audio objects. The method includes generating a synchronized rendering matrix based on the object metadata, the first timing data, and information relating to a current playback system configuration, the synchronized rendering matrix having a rendering instance for each reconstruction instance, multiplying each reconstruction instance with a corresponding rendering instance to form a corresponding instance of an integrated rendering matrix, and applying the integrated rendering matrix to the audio signals in order to render an audio output.

Integrated reconstruction and rendering of audio signals

The present document relates to transcoding of metadata, and in particular to a method and system for transcoding metadata with reduced computational complexity. A transcoder configured to transcode an inbound bitstream comprising an inbound content frame and an associated inbound metadata frame into an outbound bitstream comprising an outbound content frame and an associated outbound metadata frame is described. The inbound content frame is indicative of a signal encoded according to a first codec system and the outbound content frame is indicative of the signal encoded according to a second codec system. The transcoder is configured to identify an inbound block of metadata from the inbound metadata frame, the inbound block of metadata associated with an inbound descriptor indicative of one or more properties of metadata comprised within the inbound block of metadata, and to generate the outbound metadata frame from the inbound metadata frame based on the inbound descriptor.

Metadata transcoding

The present document relates to the design of anti-aliasing and/or anti-imaging filters for resamplers using rational resampling factors. In particular, the present document relates to a method for implementing such anti-aliasing and/or anti-imaging filters with reduced computational complexity. In addition, the present document relates to further aspects of an audio encoding and decoding system, such as the phase relation between the channels of a multi-channel audio signal and/or the structure of the bitstream of an encoded audio signal.

System aspects of an audio codec

The present document relates to the field of encoding and decoding of audio. In particular, the present document relates to encoding and decoding of an audio scene comprising audio objects. A method () for encoding metadata relating to a plurality of audio objects () of an audio scene () is described. The metadata comprises a first set () of metadata and a second set () of metadata. The first and second sets () of metadata comprise one or more data elements which are indicative of a property of an audio object () from the plurality of audio objects () and/or of a downmix signal () derived from the plurality of audio objects (). The method () comprises identifying () a redundant data element which is common to the first and second sets () of metadata. Furthermore, the method comprises encoding () the redundant data element of the first set () of metadata by referring to a redundant data element of a set () of metadata external for the first set () of metadata.

Exploiting metadata redundancy in immersive audio metadata

Growing community of inventors

Nuremberg, Germany

Martin Wolters