A method for immersive broadband 3D sound field playback

Abstract

The invention discloses an immersive broadband 3D sound field playback method. First, calculate the acoustic transfer function from a virtual sound source of scene A placed at a specified spatial position to each listening point in scene B, and use the function value as the virtual sound source The sound pressure value of the radiated sound field; secondly, set the speaker array on a wall in scene B to a regular rectangular equidistant layout, and based on the wave characteristics of the sound wave, use the Green's function to model the acoustics from all the speakers to the listening point Propagation features; again, based on linear convex optimization theory, the l 1 The norm is used as a sparse rule operator to perform regularization operations using the alternating direction multiplier method, and the center frequencies of eight frequency bands within 1 octave are selected to calculate the speaker weights and select active speakers. Finally, using l 2 Norm regularization calculates the weight signal of the active loudspeaker in the playback system, so that under the least mean square criterion, the radiation sound field of the sound source to be played back is closest to the radiation sound field of the active loudspeaker.

Description

technical field [0001] The invention belongs to the technical field of acoustics, in particular to an immersive broadband 3D sound field playback method. Background technique [0002] Spatial sound reproduction is the most critical content in 3D audio technology. The purpose is to reproduce a desired sound scene as accurately as possible, giving the listener a sense of presence and immersion. The main implementation method is to use a group of loudspeaker arrays to reconstruct an acoustic environment consistent with the desired sound field in a designated space. In the existing sound field playback system, the layout of the loudspeaker array is usually a circular or spherical array, which requires the use of large equipment such as ball racks for actual placement, which brings operational difficulties and inconvenience to users. In recent years, with the development of virtual reality and augmented reality, users' demand for immersive experience has become more and more urg...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of cumbersome speaker layout and high algorithm complexity in the existing multi-channel audio playback system, the present invention provides an immersive broadband 3D sound field playback method, which is suitable for broadband voice signal 3D in immersive application scenarios Sound field reproduction, using a group of speakers arranged on the wall to reconstruct the target sound field through sound pressure matching

[0005] The present invention is used to solve the problem of difficulty in accurately perceptually replaying a target sound source in an actual scene, comprising the following steps:

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