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

Friedrich-alexander-universitaet Erlangen-nuernberg

Technische Universitaet Ilmenau

Faunhofer-gesellschaft Zur Foerderung Der Angewandten

Fabian Kuech

Achim Kuntz

Juergen Herre

Michael Kratschmer

Giovanni Del Galdo

Oliver Thiergart

Johannes Hilpert

Emanuel Habets

Ville Topias Pulkki

Markus Multrus

Guillaume Fuchs

Stefan Bayer

Christof Faller

Christian Uhle

Bernhard Neugebauer

Sascha Disch

Mikko-Ville Laitinen

Stefan Doehla

Jan Plogsties

Christian Ertel

Adrian Murtaza

Christian Borss

Tom Baeckstroem

Sascha Dick

Florin Ghido

Bernhard Grill

Jürgen Herre

Juha Vilkamo

Andreas Hoelzer

Wolfgang Jaegers

Markus Schmidt

Stephan Schreiner

Simone Neukam

Oliver Wuebbolt

Mikko-ville Laitinen

Markus Kallinger

Dirk Mahne

Michael Meier

Richard Schultz-Amling

Christoph Faller

Alexander Adami

Alexandra Craciun

Alexandre Boutheon

Srikanth Korse

Andreas Silzle

Arne Borsum

Alexis Favrot

Andrea Eichenseer

Hanne Stenzel

Anthony Lombard

Edwin Mabande

Bernhard Birzer

Paolo Annibale

Jukka Ahonen

Cornelia Falch

Simone Fueg

Archontis Politis

Oliver Moser

Axel Plinge

Marco Diatschuk

Christophe Tournery

Meray Zourub

Jurgen Herre

The invention provides a concept for combined dynamic range compression and guided clipping prevention for audio devices. An audio decoder for decoding an audio bitstream and a metadata bitstream related to the audio bitstream according to the concept includes an audio processing chain including a plurality of adjustment stages including a dynamic range control stage for adjusting a dynamic range of the audio output signal and a guided clipping prevention stage for preventing clipping of the audio output signal; and a metadata decoder configured to receive the metadata bitstream and to extract dynamic range control gain sequences and guided clipping prevention gain sequences from the metadata bitstream, at least a part of the dynamic range control gain sequences being supplied to the dynamic range control stage, and at least a part of the guided clipping prevention gain sequences being supplied to the guided clipping prevention stage.

Concept for combined dynamic range compression and guided clipping prevention for audio devices

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

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 processing an audio signal includes an audio signal analyzer and a filter. The audio signal analyzer is configured to analyze an audio signal to determine a plurality of noise suppression filter values for a plurality of bands of the audio signal, wherein the analyzer is configured to determine a noise suppression filter value so that a noise suppression filter value is greater than or equal to a minimum noise suppression filter value and so that the minimum noise suppression value depends on a characteristic of the audio signal. The filter is configured for filtering the audio signal, wherein the filter is adjusted based on the noise suppression filter values.

Apparatus and method for reducing noise in an audio signal

An apparatus for generating an enhanced sound field description includes: a sound field generator for generating at least one sound field description indicating a sound field with respect to at least one reference location; and a meta data generator for generating meta data relating to spatial information of the sound field, wherein the at least one sound field description and the meta data constitute the enhanced sound field description. The meta data can be a depth map associating a distance information to a direction in a full band or a subband, i.e., a time frequency bin.

Concept for generating an enhanced sound-field description or a modified sound field description using a depth-extended DirAC technique or other techniques

An audio encoder device includes an audio encoder configured for producing an encoded audio bitstream from an audio signal having consecutive audio frames; a dynamic range control encoder configured for producing an encoded dynamic range control bitstream fromanadynamic range control sequence corresponding to the audio signal and having consecutive dynamic range control frames, wherein each dynamic range control frame of the dynamic range control frames has one or more nodes, wherein each node of the one or more nodes has gain information for the audio signal and time information indicating to which point in time the gain information corresponds.

Audio encoder device and an audio decoder device having efficient gain coding in dynamic range control

An apparatus for generating an audio output signal having two or more audio output channels from an audio input signal having two or more audio input channels includes a provider and a signal processor. The provider is adapted to provide first covariance properties of the audio input signal. The signal processor is adapted to generate the audio output signal by applying a mixing rule on at least two of the two or more audio input channels. The signal processor is configured to determine the mixing rule based on the first covariance properties of the audio input signal and based on second covariance properties of the audio output signal, the second covariance properties being different from the first covariance properties.

Optimal mixing matrices and usage of decorrelators in spatial audio processing

An apparatus for mapping a first input channel and a second input channel of an input channel configuration to at least one output channel of an output channel configuration, wherein each input channel and each output channel has a direction in which an associated loudspeaker is located relative to a central listener position, configured to map the first input channel to a first output channel of the output channel configuration; and despite of the fact that an angle deviation between a direction of the second input channel and a direction of the first output channel is less than an angle deviation between a direction of the second input channel and the second output channel and/or is less than an angle deviation between the direction of the second input channel and the direction of the third output channel, map the second input channel to the second and third output channels by panning between the second and third output channels.

Apparatus and method for mapping first and second input channels to at least one output channel

Apparatus and method for processing an audio signal using noise suppression filter values

An apparatus for generating an audio output signal is provided. The audio output signal has two or more audio output channels and is generated from an audio input signal having two or more audio input channels. The apparatus includes a provider and a signal processor. The provider is adapted to provide first covariance properties of the audio input signal. The signal processor is adapted to generate the audio output signal by applying a mixing rule on at least two of the two or more audio input channels. The signal processor is configured to determine the mixing rule based on the first covariance properties of the audio input signal and based on second covariance properties of the audio output signal, the second covariance properties being different from the first covariance properties.

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Erlangen, Germany

Fabian Kuech