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Ambisonics matching projection decoding method for irregular loudspeaker placements

A decoding method and matching projection technology, which is applied in the field of virtual sound reproduction, can solve the problems of inflexible number and placement of speakers, fixed placement of speakers, etc.

Active Publication Date: 2017-09-08
PEKING UNIV
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Problems solved by technology

[0004] Although the ambisonics method of codec separation has brought great advantages to 3D sound recording and playback, it has encountered difficulties on the road to the market. One of the reasons is the determination of the order of ambisonics, the number of speakers and their placement. not flexible
The invention proposes a decoding method applied to an ambisonics sound playback system to solve the situation that the speaker is placed relatively fixed

Method used

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  • Ambisonics matching projection decoding method for irregular loudspeaker placements
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  • Ambisonics matching projection decoding method for irregular loudspeaker placements

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Embodiment Construction

[0033] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0034] figure 2 Invention flowchart is divided into three steps

[0035] 1. Know the location of the sound source and amplitude s, assuming that the sound source emits a plane wave, the sound field in the center without a sound source can be expressed by the spherical harmonic function component, according to the plane wave propagation characteristics and the wave equation Fourier-Bessel level expression, the spherical harmonic signal It is obtained from the decomposition of spherical harmonic functions.

[0036] 2. Know the location of the speaker Assuming that the loudspeaker emits a plane wave, the sound field in the area without a sound source inside the center can be expressed by the spherical harmonic function component. According to the plane wave propagation characteristics and the wave equation Fourier-Bessel level expression, the spherical ha...

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Abstract

The invention discloses an Ambisonics matching projection decoding method for irregular loudspeaker placements. The method comprises the following steps of 1) obtaining a spherical harmonics signal of a sound source according to the position of the sound source; obtaining a spherical harmonics signal of a loudspeaker according to the position of the loudspeaker; and 2) carrying out matching projection on the spherical harmonics signal of the sound source and the spherical harmonics signal of the loudspeaker to obtain a gain g of each loudspeaker. According to the method, the requirements of an Ambisonics sound reproduction system for the fixed positions of the loudspeakers are solved, and the reconstructed sound field is stable.

Description

technical field [0001] The invention belongs to the technical field of virtual sound reproduction. The invention proposes a new ambisonics decoding method matching projection method, which solves the requirement of the ambisonics sound reproduction system on the fixed position of loudspeakers. Background technique [0002] The era of 3D multimedia has arrived, and 3D audio and video systems are rapidly moving toward cinemas, home theaters, and handheld terminal devices, becoming the new focus of major electronics manufacturers around the world. Surround sound playback technology plays an important role in 3D audio and video systems. The current mainstream technologies include VBAP (Vector Base Amplitude Panning), Ambisonics, and WFS (WaveField Synthetize). Among them, the Ambisonics method was proposed by Michael Gerzon of Oxford University in 1973. It mainly controls the orientation of the virtual sound source by decomposing and reconstructing the original sound field based...

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Application Information

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IPC IPC(8): H04R5/04H04S7/00
CPCH04R5/04H04R2205/026H04S7/30
Inventor 曲天书吴玺宏黄智超
Owner PEKING UNIV
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