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

Friedrich-alexander-universitaet Erlangen-nuernberg

Markus Kallinger

Fabian Kuech

Giovanni Del Galdo

Oliver Thiergart

Richard Schultz-Amling

Achim Kuntz

Dirk Mahne

Mikko-Ville Laitinen

Ville Topias Pulkki

Juergen Herre

Christof Faller

Bernhard Grill

Jürgen Herre

Alexis Favrot

Jurgen Herre

Michael Kratschmer

Fabian Küch

Mikko-ville Laitinen

Fabian Kuch

Markus Schmidt

Cornelia Falch

Alexandra Craciun

Ville Pulkki

Oliver Moser

Marco Diatschuk

Meray Zourub

A spatial audio processor for providing spatial parameters based on an acoustic input signal has a signal characteristics determiner and a controllable parameter estimator. The signal characteristics determiner is configured to determine a signal characteristic of the acoustic input signal. The controllable parameter estimator for calculating the spatial parameters for the acoustic input signal in accordance with a variable spatial parameter calculation rule is configured to modify the variable spatial parameter calculation rule in accordance with the determined signal characteristic.

Spatial audio processor and a method for providing spatial parameters based on an acoustic input signal

An apparatus for generating an audio output signal to simulate a recording of a virtual microphone at a configurable virtual position in an environment includes a sound events position estimator and an information computation module. The former is adapted to estimate a sound source position indicating a position of a sound source in the environment, wherein the sound events position estimator is adapted to estimate the sound source position based on first and second direction information provided by first and second real spatial microphones, respectively, located at first and second real microphone positions in the environment, respectively. The information computation module is adapted to generate the audio output signal based on a first recorded audio input signal, on the first real microphone position, on the virtual position of the virtual microphone, and on the sound source position.

Sound acquisition via the extraction of geometrical information from direction of arrival estimates

An apparatus for converting a first parametric spatial audio signal representing a first listening position or a first listening orientation in a spatial audio scene to a second parametric spatial audio signal representing a second listening position or a second listening orientation is described, the apparatus including: a spatial audio signal modification unit adapted to modify the first parametric spatial audio signal dependent on a change of the first listening position or the first listening orientation so as to obtain the second parametric spatial audio signal, wherein the second listening position or the second listening orientation corresponds to the first listening position or the first listening orientation changed by the change.

Apparatus and a method for converting a first parametric spatial audio signal into a second parametric spatial audio signal

An apparatus for capturing audio information from a target location includes first and second beamformers arranged in a recording environment and having first and second recording characteristics, respectively, and a signal generator. The first and second beamformers are configured for recording first and second beamformer audio signals, respectively, when they are directed towards the target location with respect to the first and second recording characteristics. The first and second beamformers are arranged such that first and second virtual straight lines, defined to pass through the first and second beamformers, respectively, and the target location, are not mutually parallel. The signal generator is configured to generate an audio output signal based on the first and second beamformer audio signals so that the audio output signal reflects relatively more audio information from the target location compared to the audio information from the target location in the first and second beamformer audio signals.

Apparatus and method for spatially selective sound acquisition by acoustic  triangulation

An audio format transcoder for transcoding an input audio signal, the input audio signal having at least two directional audio components. The audio format transcoder including a converter for converting the input audio signal into a converted signal, the converted signal having a converted signal representation and a converted signal direction of arrival. The audio format transcoder further includes a position provider for providing at least two spatial positions of at least two spatial audio sources and a processor for processing the converted signal representation based on the at least two spatial positions to obtain at least two separated audio source measures.

Audio format transcoder

An acoustic echo suppression unit according to an embodiment of the present invention includes and input interface for extracting a downmix signal from an input signal, the input signal including the downmix signal and parametric side information, wherein the downmix and the parametric side information together represent a multichannel signal, a calculator for calculating filter coefficients for an adaptive filter, wherein the calculator is adapted to determine the filter coefficients based on the downmix signal and a microphone signal or a signal derived from the microphone signal, and an adaptive filter adapted to filter the microphone signal or the signal derived from the microphone signal based on the filter coefficients to suppress an echo caused by the multichannel signal in the microphone signal.

Acoustic echo suppression unit and conferencing front-end

An embodiment of an apparatus for computing control information for a suppression filter for filtering a second audio signal to suppress an echo based on a first audio signal includes a computer having a value determiner for determining at least one energy-related value for a band-pass signal of at least two temporally successive data blocks of at least one signal of a group of signals. The computer further includes a mean value determiner for determining at least one mean value of the at least one determined energy-related value for the band-pass signal. The computer further includes a modifier for modifying the at least one energy-related value for the band-pass signal on the basis of the determined mean value for the band-pass signal. The computer further includes a control information computer for computing the control information for the suppression filter on the basis of the at least one modified energy-related value.

Apparatus and method for computing control information for an echo suppression filter and apparatus and method for computing a delay value

An apparatus for merging a first spatial audio stream with a second spatial audio stream to obtain a merged audio stream comprising an estimator for estimating a first wave representation comprising a first wave direction measure and a first wave field measure for the first spatial audio stream, the first spatial audio stream having a first audio representation and a first direction of arrival. The estimator being adapted for estimating a second wave representation comprising a second wave direction measure and a second wave field measure for the second spatial audio stream, the second spatial audio stream having a second audio representation and a second direction of arrival. The apparatus further comprising a processor for processing the first wave representation and the second wave representation to obtain a merged wave representation comprising a merged wave field measure and a merged direction of arrival measure, and for processing the first audio representation and the second audio representation to obtain a merged audio representation, and for providing the merged audio stream comprising the merged audio representation and the merged direction of arrival measure.

Apparatus for merging spatial audio streams

An apparatus for resolving an ambiguity from a DOA estimate includes a DOA estimate analyzer for analyzing the DOA estimate to obtain a plurality of ambiguous analysis parameters by using a bias information, the bias information representing a relation between a biased and an unbiased DOA estimate, and an ambiguity resolver for resolving the ambiguity in the plurality of ambiguous analysis parameters to obtain a non-ambiguous resolved parameter.

Apparatus and method for resolving an ambiguity from a direction of arrival estimate

An apparatus for determining a converted spatial audio signal, the converted spatial audio signal having an omnidirectional audio component and at least one directional audio component, from an input spatial audio signal, the input spatial audio signal having an input audio representation and an input direction of arrival. The apparatus has an estimator for estimating a wave representation having a wave field measure and a wave direction of arrival measure based on the input audio representation and the input direction of arrival. The apparatus further has a processor for processing the wave field measure and the wave direction of arrival measure to obtain the omnidirectional audio component and the at least one directional component.

Apparatus for determining a converted spatial audio signal

A preferred embodiment of an apparatus for computing filter coefficients for an adaptive filter for filtering a microphone signal so as to suppress an echo due to a loudspeaker signal includes an extractor for extracting a stationary component signal or a non-stationary component signal from the loudspeaker signal or from a signal derived from the loudspeaker signal, and a computer for computing the filter coefficients for the adaptive filter on the basis of the extracted stationary component signal or the extracted non-stationary component signal.

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Erlangen, Germany

Markus Kallinger