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Method and apparatus for changing relative positions of sound objects contained within higher-order ambisonics representation

A high-end high-fidelity, stereo technology, applied in the direction of stereo system, quasi-stereo system, speaker shell layout, etc., can solve problems such as error-prone

Active Publication Date: 2014-03-12
INTERDIGITAL CE PATENT HLDG
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Problems solved by technology

The disadvantage is that complex and error-prone scene decomposition is required

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  • Method and apparatus for changing relative positions of sound objects contained within higher-order ambisonics representation
  • Method and apparatus for changing relative positions of sound objects contained within higher-order ambisonics representation
  • Method and apparatus for changing relative positions of sound objects contained within higher-order ambisonics representation

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Embodiment Construction

[0028] In the following, for ease of understanding, the spatial warping applying the present invention is described in the context of a two-dimensional setup, the HOA representation relies on circular harmonics, and it is assumed that the represented sound field includes only plane acoustic waves. Then, the description is extended to the three-dimensional case based on spherical harmonics.

[0029] symbol system

[0030] In Ambisonics theory, the sound field at or near a particular point in space is described by a truncated Fourier-Bessel series. In general, the reference point is assumed to be at the origin of the selected coordinate system.

[0031] For 3D applications using spherical coordinates, coefficients for all defined indices n=0, 1, ..., N and m = -n, ..., n The Fourier series of describes the pressure of the sound field at azimuth φ, inclination θ and distance r from the origin:

[0032] p ( r , ...

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Abstract

Higher-order Ambisonics HOA is a representation of spatial sound fields that facilitates capturing, manipulating, recording, transmission and playback of complex audio scenes with superior spatial resolution, both in 2D and 3D. The sound field is approximated at and around a reference point in space by a Fourier-Bessel series. The invention uses space warping (12, 13, 14; 16) for modifying the spatial content and / or the reproduction of sound-field information that has been captured or produced as a higher-order Ambisonics representation. Different warping characteristics are feasible for 2D and 3D sound fields. The warping is performed in space domain without performing scene analysis or decomposition. Input HOA coefficients with a given order are decoded to the weights or input signals of regularly positioned (virtual) loudspeakers.

Description

technical field [0001] The invention relates to a method and apparatus for changing the relative position of sound objects contained in a two-dimensional or three-dimensional ambisonics representation of an audio scene. Background technique [0002] Higher-order Ambisonics (HOA) is a spatial sound field representation that facilitates the capture, processing, recording, transmission and playback of complex audio scenes (2D and 3D) with superior spatial resolution. A sound field is a Fourier-Bessel series approximation at or around a reference point in space. [0003] Currently there are only a limited number of techniques for processing the spatial arrangement of audio scenes captured using HOA techniques. In principle, there are two methods: [0004] A) Decompose the audio scene into separated sound objects and associated position information, e.g. via Dirac (DirAC), and use the processed position parameters to compose a new scene. The disadvantage is that a complex and ...

Claims

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Application Information

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IPC IPC(8): G10L21/00
CPCG10L21/00H04S2400/11H04S5/00H04R2205/024H04S2420/11H04S3/002
Inventor P.贾克斯J-M.巴特克
Owner INTERDIGITAL CE PATENT HLDG
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