System and method for visualizing sound source energy distribution
First Claim
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1. A system for visualizing sound source energy distribution, comprising:
- an array of microphones, used to receive multiple sound source signals;
a multi-channel capture device, transforming said sound source signals into multiple digital sound source signals; and
a sound source energy distribution reconstructor, wherein a propagation matrix and a window matrix is obtained via assigning values to the coordinates of said array of microphones and assigning values to the coordinates of multiple retreated focus points on a retreated focus point surface;
an inverse operation is performed on said propagation matrix;
a multiplication operation of the result of said inverse operation and said window matrix is performed;
the result of said multiplication operation is transformed from the frequency domain to the time domain to establish said sound source energy distribution reconstructor;
after said sound source energy distribution reconstructor has received said digital sound source signals, a convolution operation of said digital sound source signals and said sound source energy distribution reconstructor is performed to obtain a sound source energy distribution on said retreated focus point surface.
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Abstract
The present invention discloses a system for visualizing sound source energy distribution and a method thereof, wherein a propagation matrix and a window matrix are obtained firstly; next, an inverse operation of the propagation matrix is performed; next, a multiplication operation of the result of the inverse operation and the window matrix is performed; next, the result of the multiplication operation is transformed from the time domain to the frequency domain; thus, a sound source energy distribution reconstructor is established; then, an array of microphones is used to receive the sound source signals; next, a multi-channel capture device transforms the received sound source signals into digital sound source signals; lastly, a convolution operation is performed on the digital sound source signals and the sound source energy distribution reconstructor to obtain a visualized sound source energy distribution. Therefore, the present invention can provide the energy distributions of nearfield/farfield stable-state/unstable-state sound sources.
22 Citations
29 Claims
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1. A system for visualizing sound source energy distribution, comprising:
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an array of microphones, used to receive multiple sound source signals;
a multi-channel capture device, transforming said sound source signals into multiple digital sound source signals; and
a sound source energy distribution reconstructor, wherein a propagation matrix and a window matrix is obtained via assigning values to the coordinates of said array of microphones and assigning values to the coordinates of multiple retreated focus points on a retreated focus point surface;
an inverse operation is performed on said propagation matrix;
a multiplication operation of the result of said inverse operation and said window matrix is performed;
the result of said multiplication operation is transformed from the frequency domain to the time domain to establish said sound source energy distribution reconstructor;
after said sound source energy distribution reconstructor has received said digital sound source signals, a convolution operation of said digital sound source signals and said sound source energy distribution reconstructor is performed to obtain a sound source energy distribution on said retreated focus point surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for visualizing sound source energy distribution, comprising the following steps:
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(a) assigning values to the coordinates of an array of microphones, and assigning values to the coordinates of multiple retreated focus points on a retreated focus point surface;
(b) specifying a frequency, and obtaining a propagation matrix with the distance between the coordinate of said retreated focus point and the coordinate of the microphone of said array, and obtaining a window matrix via;
defining a boundary of said retreated focus point surface, assigning 1 to the coordinates of said retreated focus points inside said boundary, and assigning 0 to the coordinates of said retreated focus points outside said boundary;
(c) performing an inverse operation on said propagation matrix;
performing a multiplication operation of the result of said inverse operation and said window matrix;
transforming the result of said multiplication operation from the frequency domain to the time domain;
establishing a sound source energy distribution reconstructor;
(d) receiving multiple sound source signals via an array of microphones, and transforming said sound source signals into multiple digital sound source signals via a multi-channel capture device; and
(e) performing an convolution operation of said digital sound source signals and said sound source energy distribution reconstructor to obtain a sound source energy distribution on said retreated focus point surface. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Application NumberUS11/439,286Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current381/56CPC Class CodesG01H 3/125 for representing acoustic f...H04R 1/406 microphonesH04R 2201/401 2D or 3D arrays of transducersH04R 2201/403 Linear arrays of transducersH04R 29/005 Microphone arrays
