A 3D recording system spherical microphone array distribution method
A technology of microphone array and recording system, applied in the field of signal processing, to achieve the effect of high determination distribution efficiency and good sampling effect
Active Publication Date: 2018-06-19
PEKING UNIV
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Problems solved by technology
[0004] Aiming at the problem of arranging any number of microphones on the surface of the sampling sphere, the present invention proposes a method for approximately uniformly arranging the microphones on the surface of the sphere
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Embodiment Construction
[0030] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings of the present invention.
[0031] First, use the random number function to assign values to the coordinates of the sampling points, and obtain the three-dimensional coordinate vector of each sampling point as r 0 .
[0032] Set the initial velocity vector v of each point 0 =[0,0,0].
[0033] Set the repulsion constant as G, which represents the proportional relationship between acceleration and force.
[0034] Set the initial value of the number of cycles to 1, n=1.
[0035] Put the position coordinate vector r 0 and velocity vector v 0 Bring it into the loop, and update the position coordinates and speed by continuously repeating the following process:
[0036] 1. Subtract the three-dimensional coordinates of any two points i and j on the spherical surface, and calculate the distance vector dd between each two points ij ,
[0037] dd ij = r i ...
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The invention discloses a method for distributing a spherical microphone array of a 3D recording system. The method comprises the following steps: step 1), modeling the spherical 3D recording system, and obtaining a unit sphere; then taking N microphones to be distributed as charged particles, and distributing the N microphones on a surface of the unit sphere; step 2), calculating the magnitude of the resultant force of each charged particle in each direction, then calculating a tangential component of the resultant force on a corresponding charged particle; step 3), according to a tangent vector, calculating the coordinate of a corresponding charged particle flying out of the surface of the unit sphere along the tangential movement, then normalizing the coordinate of each charged particle along a radial direction, and making all charged particles return to the surface of the unit sphere again; and step 4), circulating steps 2) and 3) for several times, when the resultant force of each charged particle is less than a set value, then the spherical uniform distribution of various charged particles can be obtained, that is the array distribution of the N microphones in the spherical 3D recording system. The method for distributing the microphone array of the 3D recording system provided by the invention has the advantages of being high in determined distribution efficiency, good in sampling effect and so on.
Description
technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to an arrangement method of a microphone array, in particular to a method for distributing a spherical microphone array in a 3D recording system. Background technique [0002] With the rapid development of multimedia technology and digital signal processing technology, people have higher and higher requirements for spatial stereo. Sound propagates in the form of waves, which will form a specific sound field in the propagating space. In the sound field, people will have auditory experience of sound, but only when they are "immersive", can people have the most real feeling of sound. Traditional stereo technology can no longer meet the needs of this experience. How to obtain this "immersive" experience has always been an important direction of signal processing research. [0003] At present, the research on 3D audio mainly has two directions: sound field percept...
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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 曲天书吴玺宏高山
Owner PEKING UNIV