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

Technische Universitaet Ilmenau

Friedrich-alexander-universitaet Erlangen-nuernberg

Technische Universitat Ilmenau

Achim Kuntz

Johannes Hilpert

Fabian Kuech

Christian Ertel

Andreas Hoelzer

Michael Kratschmer

Juergen Herre

Sascha Dick

Jan Plogsties

Bernhard Grill

Christian Borss

Giovanni Del Galdo

Christian Helmrich

Oliver Thiergart

Simone Fueg

Michael Fischer

Florian Schuh

Dirk Mahne

Sascha Disch

Juha Vilkamo

Florin Ghido

Julien Robilliard

Markus Kallinger

Christoph Faller

Max Neuendorf

Herbert Thoma

Stefan Kraegeloh

Tom Baeckstroem

Alexander Adami

Richard Schultz-Amling

Robert Bleidt

Andreas Niedermeier

Emanuel Habets

Adrian Murtaza

Ville Topias Pulkki

Andreas Silzle

Alexandra Craciun

Hanne Stenzel

Mikko-Ville Laitinen

Fabian Küch

Simone Neukam

Frederik Nagel

Christof Faller

Matthias Neusinger

Alexandre Bouthéon

Oliver Wübbolt

Alexander Niederleitner

Archontis Politis

Axel Plinge

Andreas Neidermeier

Moritz Wild

Fabian Kuch

Simone Fug

Andreas Holzer

Oliver Wuebbolt

Tom Backstrom

Jurgen Herre

A method is described which decodes a downmix matrix for mapping a plurality of input channels of audio content to a plurality of output channels, the input and output channels being associated with respective speakers at predetermined positions relative to a listener position, wherein the downmix matrix is encoded by exploiting the symmetry of speaker pairs of the plurality of input channels and the symmetry of speaker pairs of the plurality of output channels. Encoded information representing the encoded downmix matrix is received and decoded for obtaining the decoded downmix matrix.

Method for decoding and encoding a downmix matrix, method for presenting audio content, encoder and decoder for a downmix matrix, audio encoder and audio decoder

An apparatus for generating loudspeaker signals includes an object metadata processor configured to receive metadata, to calculate a second position of the audio object depending on the first position of the audio object and on a size of a screen if the audio object is indicated in the metadata as being screen-related, to feed the first position of the audio object as the position information into the object renderer if the audio object is indicated in the metadata as being not screen-related, and to feed the second position of the audio object as the position information into the object renderer if the audio object is indicated in the metadata as being screen-related. The apparatus further includes an object renderer configured to receive an audio object and to generate the loudspeaker signals depending on the audio object and on position information.

Apparatus and method for screen related audio object remapping

An audio decoder for providing at least four audio channel signals on the basis of an encoded representation is configured to provide a first residual signal and a second residual signal on the basis of a jointly encoded representation of the first residual signal and of the second residual signal using a multi-channel decoding. The audio decoder is configured to provide a first audio channel signal and a second audio channel signal on the basis of a first downmix signal and the first residual signal using a residual-signal-assisted multi-channel decoding. The audio decoder is configured to provide a third audio channel signal and a fourth audio channel signal on the basis of a second downmix signal and the second residual signal using a residual-signal-assisted multi-channel decoding. An audio encoder is based on corresponding considerations.

Audio encoder, audio decoder, methods and computer program using jointly encoded residual signals

Apparatus for processing a sound field representation related to a defined reference point or defined listening orientation for the sound field representation including: a sound field processor for processing the sound field representation using a deviation of a target listening position from the defined reference point or a target listening orientation from the defined listening orientation to obtain a processed sound field description which, when rendered, provides an impression of the sound field representation at the target listening position being different from the defined reference point or for the target listening orientation being different from the defined listening orientation, or for processing the sound field representation using a spatial filter to obtain the processed sound field description which, when rendered, provides an impression of a spatially filtered sound field description, the sound field processor being configured to process the sound field representation to apply the deviation or the spatial filter in a spatial transform domain with an associated forward transform rule and backward transform rule.

Apparatus, method or computer program for processing a sound field representation in a spatial transform domain

Audio encoder for encoding audio input data to obtain audio output data includes an input interface for receiving a plurality of audio channels, a plurality of audio objects and metadata related to one or more of the plurality of audio objects; a mixer for mixing the plurality of objects and the plurality of channels to obtain a plurality of pre-mixed channels, each pre-mixed channel including audio data of a channel and audio data of at least one object; a core encoder for core encoding core encoder input data; and a metadata compressor for compressing the metadata related to the one or more of the plurality of audio objects, wherein the audio encoder is configured to operate in at least one mode of the group of two modes.

Concept for audio encoding and decoding for audio channels and audio objects

Audio splicing is rendered more effective by the use of one or more truncation unit packets inserted into the audio data stream so as to indicate to an audio decoder, for a predetermined access unit, an end portion of an audio frame with which the predetermined access unit is associated, as to be discarded in playout.

Audio splicing concept

A method for mapping a plurality of input channels of an input channel configuration to output channels of an output channel configuration includes providing a set of rules associated with each input channel of the plurality of input channels, wherein the rules define different mappings between the associated input channel and a set of output channels. For each input channel of the plurality of input channels, a rule associated with the input channel is accessed, determination is made whether the set of output channels defined in the accessed rule is present in the output channel configuration, and the accessed rule is selected if the set of output channels defined in the accessed rule is present in the output channel configuration. The input channels are mapped to the output channels according to the selected rule.

Method and signal processing unit for mapping a plurality of input channels of an input channel configuration to output channels of an output channel configuration

An apparatus for generating a plurality of audio channels for a speaker setup, comprises a processor repeating an energy distribution from a speaker not contained in the speaker setup to the speakers in the speaker setup to acquire a downmix information for a downmix to the speaker setup; and a renderer for generating the plurality of audio channels using the downmix information.

Apparatus and method for generating a plurality of audio channels

An audio decoder device for decoding a compressed input audio signal having at least one core decoder having one or more processors for generating a processor output signal based on a processor input signal, wherein a number of output channels of the processor output signal is higher than a number of input channels of the processor input signal, wherein each of the one or more processors has a decorrelator and a mixer, wherein a core decoder output signal having a plurality of channels has the processor output signal, and wherein the core decoder output signal is suitable for a reference loudspeaker setup; at least one format converter device configured to convert the core decoder output signal into an output audio signal, which is suitable for a target loudspeaker setup; and a control device configured to control at least one or more processors in such way that the decorrelator of the processor may be controlled independently from the mixer of the processor, wherein the control device is configured to control at least one of the decorrelators of the one or more processors depending on the target loudspeaker setup.

Renderer controlled spatial upmix

An apparatus for converting an object position of an audio object from a Cartesian representation to a spherical representation is described. A basis area of the Cartesian representation is subdivided into a plurality of basis area triangles, and wherein a plurality of spherical-domain triangles are inscribed into a circle of a spherical representation. The apparatus is configured to determine, in which of the basis area triangles a projection of the object position of the audio object into the base area is arranged; and the apparatus is configured to determine a mapped position of the projection of the object position using a linear transform, which maps the base area triangle onto its associated spherical domain triangle. The apparatus is configured to derive an azimuth angle and an intermediate radius value from the mapped position. The apparatus is configured to obtain a spherical domain radius value and an elevation angle in dependence on the intermediate radius value and in dependence on a distance of the object position from the base area. An apparatus for converting an object position of an audio object from a spherical representation to a spherical representation, applications of these apparatuses, methods and computer programs are also described.

Apparatuses for converting an object position of an audio object, audio stream provider, audio content production system, audio playback apparatus, methods and computer programs

An audio decoder for providing at least four bandwidth-extended channel signals on the basis of an encoded representation provides first and second downmix signals on the basis of a jointly encoded representation of the first and second downmix signals using a multi-channel decoding and provides at least first and second audio channel signals on the basis of the first downmix signal using a multi-channel decoding, and provides at least third and fourth audio channel signals on the basis of the second downmix signal using a multi-channel decoding. It performs a multi-channel bandwidth extension on the basis of the first and third audio channel signals, to obtain first and third bandwidth-extended channel signals, and performs a multi-channel bandwidth extension on the basis of the second and fourth audio channel signals, to obtain second and fourth bandwidth extended channel signals. An audio encoder uses a related concept.

Audio decoder, audio encoder, method for providing at least four audio channel signals on the basis of an encoded representation, method for providing an encoded representation on the basis of at least four audio channel signals and computer program using a bandwidth extension

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Hemhofen, Germany

Achim Kuntz