APPARATUS AND METHOD FOR CONTROLLING A WAVE FIELD SYNTHESIS RENDERER MEANS WITH AUDIO OBJECTS

• US 20110144783A1
• Filed: 02/24/2011
• Published: 06/16/2011
• Est. Priority Date: 02/23/2005
• Status: Active Grant

• Current Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Original Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Inventors: REICHELT, Katrin, GATZSCHE, Gabriel, BRIX, Sandra
• Granted Patent: US 8,755,922 B2
• Time in Patent Office: Days
• US Class Current: 700/94
• CPC Class Codes: H04S 2420/13 Application of wave-field synthesis in stereophonic audio systems
• CPC Class Codes: H04S 3/008 in which the audio signals are in digital form, i.e. employing more than two discrete digital channels data reduction aspects thereof based on psychoacoustics G10L19/02
• CPC Class Codes: H04S 7/30 Control circuits for electronic adaptation of the sound field

Abstract

An apparatus for controlling a wave field synthesis renderer with audio objects includes a provider for providing a scene description, wherein the scene description defines a temporal sequence of audio objects in an audio scene and further includes information on the source position of a virtual source as well as on a start or an end of the virtual source. Furthermore, the audio object includes at least a reference to an audio file associated with the virtual source. The audio objects are processed by a processor, in order to generate a single output data stream for each renderer module, wherein both information on the position of the virtual source and the audio file itself are included in mutual association in this output data stream. With this, high portability on the one hand and high quality due to secure data consistency on the other hand are achieved.

Claims

1. An apparatus for controlling a wave field synthesis renderer with audio objects, so that the wave field synthesis renderer generates, from the audio objects, synthesis signals reproducible by a plurality of loudspeakers attachable in a reproduction room, comprising:

a provider arranged to provide a scene description, the scene description defining a temporal sequence of audio objects in an audio scene, and wherein an audio object includes information on a source position of a virtual source as well as an audio file for the virtual source or reference information referring to the audio file for the virtual source; and

a processor arranged to process the audio objects, in order to generate a single output data stream, which is to be fed to the wave field synthesis renderer, the single output data stream comprising both the audio file of the audio object and, in association with the audio file, information on the position of the virtual source of the audio object;

wherein

the apparatus for controlling a wave field synthesis renderer comprises a hardware device.

2. The apparatus according to claim 1, wherein the wave field synthesis renderer includes a single renderer module to which all loudspeakers may be coupled, and wherein the processor is formed to generate a data stream in which the information on the position of a virtual source and the audio file for all data to be processed by the renderer module are included, or

wherein the wave field synthesis renderer includes a plurality of renderer modules, which may be coupled with different loudspeakers, and wherein the processor is formed to generate, for each renderer module, an output data stream in which information on the position of the virtual sources and audio data only for audio objects to be rendered by the one renderer module for which the output data stream is provided are included.

3. The apparatus according to claim 1, wherein the processor is formed to generate the output data stream so that a header, in which the position information for a virtual source is included, is followed by the audio file for the virtual source, so that the wave field synthesis renderer is capable of determining, based on the temporal position of the header with reference to the audio file, that the audio file is to be rendered with the position information in the header.

4. The apparatus according to claim 1, wherein the processor is formed to generate the data stream so that a common header for several audio files is generated, the common header comprising, for each audio file, an entry identifying the position information for each virtual source and further indicating where the audio file for the virtual source is arranged in the data stream.

5. The apparatus according to claim 1, wherein the processor is formed to arrange the header at a fixedly default, absolute or relative position in the data stream.

6. The apparatus according to claim 1, wherein the processor is further formed to receive information on a starting time instant or end time instant due to the scene description and introduce same into the output data stream in association with the audio file.

7. The apparatus according to claim 1,

wherein the provider is formed to provide a scene description with relative time information or position information of an audio object to another audio object or a reference audio object, and

wherein the processor is formed to compute, from the relative time information or the relative position information, an absolute position of the virtual source in the reproduction room or an actual starting time instant or an actual end time instant and introduce same into the output data stream in association with the audio file.

8. The apparatus according to claim 1,

wherein the provider includes a database in which also the audio files for the audio objects are stored, and

wherein the processor is formed as a database output scheduler.

9. A method for controlling a wave field synthesis renderer with audio objects, so that the wave field synthesis renderer generates, from the audio objects, synthesis signals reproducible by a plurality of loudspeakers attachable in a reproduction room, comprising:

providing a scene description, the scene description defining a temporal sequence of audio objects in an audio scene, and wherein an audio object includes information on a source position of a virtual source as well as an audio file for the virtual source or reference information referring to the audio file for the virtual source; and

processing the audio objects, in order to generate a single output data stream, which is to be fed to the wave field synthesis renderer, the single output data stream comprising both the audio file of the audio object and, in association with the audio file, information on the position of the virtual source of the audio object;

wherein

the method for controlling a wave field synthesis renderer is performed by a hardware device.

10. A tangible computer readable medium including a computer program with program code for performing, when the program is executed on a computer, a method for controlling a wave field synthesis renderer with audio objects, so that the wave field synthesis renderer generates, from the audio objects, synthesis signals reproducible by a plurality of loudspeakers attachable in a reproduction room, the method comprising:

providing a scene description, the scene description defining a temporal sequence of audio objects in an audio scene, and wherein an audio object includes information on a source position of a virtual source as well as an audio file for the virtual source or reference information referring to the audio file for the virtual source; and

processing the audio objects, in order to generate a single output data stream, which is to be fed to the wave field synthesis renderer, the single output data stream comprising both the audio file of the audio object and, in association with the audio file, information on the position of the virtual source of the audio object.