Replay method of sound fields in three-dimensional local space based on continuous sound source concept

Abstract

The invention discloses a replay method of sound fields in a three-dimensional local space. In the method, based on a continuous sound source concept, to-be-replayed sound fields and replay sound fields from continuously-distributed replay sound sources are expanded to form spherical harmonic functions; coefficients of the spherical harmonic functions are matched to acquire driving functions of the continuously-distributed replay sound sources; the continuously-distributed replay sound sources and the driving functions thereof are discretized to obtain driving functions of an actually-discretized replay sound source array; and the driving functions are fed back to the replay sound sources for replaying the sound fields and suitable for any type of sound sources. Compared with a spherical harmonic function expansion method, the replay method is used to avoid the problems of matrix inversion and errors possibly caused by the matrix inversion and expand replay regions; and compared with a wave field synthesis method, the replay method can be used to improve the replay accuracy in micro-regions in which replay centers are contained.

Description

technical field [0001] The invention relates to a three-dimensional local space sound field playback method based on the concept of continuous sound source. Background technique [0002] The use of loudspeaker arrays allows listeners to hear sounds from all directions in a virtual acoustic environment, as if they were in a real space environment. The existing sound field playback methods mainly include spherical harmonic function expansion method and wave field synthesis (WFS) method. Although these two methods can accurately reproduce the sound field in the listening area, there are certain problems: the spherical harmonic function expansion method needs to perform matrix inversion operation when calculating the sound source drive, and when the condition number of the matrix is ​​large, it will make the The drive of the solved sound source is inaccurate, which causes a large playback error; the wave field reconstruction WFS method is based on the K-H integral equation, whi...

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Problems solved by technology

Although these two methods can accurately reproduce the sound field in the listening area, there are certain problems: the spherical harmonic function expansion method needs to perform matrix inversion operation when calculating the sound source drive, and when the condition number of the matrix is ​​large, the The drive of the solved sound source is inaccurate, which causes a large playback error; the wave field reconstruction WFS method is based on the K-H integral equation, which requires a lot of playback sound sources, and it is difficult to implement. The existing WFS system generally only considers the two-dimensional sound field Replay, that is, two-dimensional sound field reconstruction technology

[0004] The Chinese patent publication number in the prior art literature: CN 101251414A, titled "A Method for Reconstructing a Cyclostationary Sound Source Using the Wave Superposition Method", this technology reconstructs the sound source signal on the holographic measurement surface collected by a microphone array, Cyclostationary sound sources of arbitrary shape can be analyzed, but this method can only reconstruct cyclostationary sound sources and cannot reconstruct the sound field in a region

In further searches, no literature reports identical or similar to the subject of the present invention have been found

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