US 2013/0259243 A1 · SOUND ACQUISITION VIA THE EXTRACTION OF GEOMETRICAL INFORMATION FROM DIRECTION OF ARRIVAL ESTIMATES

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

AssigneesFriedrich-Alexander-Universitaet Erlangen-Nuemberg, Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

InventorsJuergen HERRE, Fabian KUECH, Markus KALLINGER, Giovanni DEL GALDO, Oliver THIERGART, Dirk MAHNE, Achim KUNTZ, Michael KRATSCHMER, Alexandra CRACIUN

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Abstract

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.

An apparatus for generating an audio output signal to simulate a recording of the audio output signal by a virtual microphone at a configurable virtual position in an environment, comprising:

a sound events position estimator for estimating a sound event position indicating a position of a sound event in the environment, wherein the sound event is active at a certain time instant or in a certain time-frequency bin, wherein the sound event is a real sound source or a mirror image source, wherein the sound events position estimator is configured to estimate the sound event position indicating a position of a mirror image source in the environment when the sound event is a mirror image source, and wherein the sound events position estimator is adapted to estimate the sound event position based on a first direction information provided by a first real spatial microphone being located at a first real microphone position in the environment, and based on a second direction information provided by a second real spatial microphone being located at a second real microphone position in the environment, wherein the first real spatial microphone and the second real spatial microphone are spatial microphones which physically exist;
and wherein the first real spatial microphone and the second real spatial microphone are apparatuses for acquisition of spatial sound capable of retrieving direction of arrival of sound, and
an information computation module for generating the audio output signal based on a first recorded audio input signal, based on the first real microphone position, based on the virtual position of the virtual microphone, and based on the sound event position,
wherein the first real spatial microphone is configured to record the first recorded audio input signal, or wherein a third microphone is configured to record the first recorded audio input signal,
wherein the sound events position estimator is adapted to estimate the sound event position based on a first direction of arrival of the sound wave emitted by the sound event at the first real microphone position as the first direction information and based on a second direction of arrival of the sound wave at the second real microphone position as the second direction information, and
wherein the information computation module comprises a propagation compensator,
wherein the propagation compensator is adapted to generate a first modified audio signal by modifying the first recorded audio input signal, based on a first amplitude decay between the sound event and the first real spatial microphone and based on a second amplitude decay between the sound event and the virtual microphone, by adjusting an amplitude value, a magnitude value or a phase value of the first recorded audio input signal, to acquire the audio output signal;
or wherein the propagation compensator is adapted to generate a first modified audio signal by compensating a first time delay between an arrival of a sound wave emitted by the sound event at the first real spatial microphone and an arrival of the sound wave at the virtual microphone by adjusting an amplitude value, a magnitude value or a phase value of the first recorded audio input signal, to acquire the audio output signal.

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Facts

Application

13/904,870Filed 29 May 2013

Priority

2 Dec 2011

Published

3 Oct 2013

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

G10L 19/00
Speech or audio signals analysis-synthesis techniques for redundancy reduction
G10L 19/02
Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals,…:…
G10L 19/167
Vocoder architecture: audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission…
G10L 19/20
Vocoders using multiple modes: using sound class specific coding, hybrid encoders or object based coding

Abstract

Claims18