Development of Sound Source Identification System Using Inverse Transmission-Line Matrix Modeling

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The inverse transmission-line matrix modeling is applied to a sound source identification system. Two identification methods are considered; one is the method using the amplitude distribution by FFT, and another is using the average power distribution. Two or three dimensional acoustic fields are considered for the numerical simulations. Some numerical demonstrations are made for several sound sources. The sources are well identified by both methods, but the FFT method is under the influence of the diffraction effect rather than the power method. It is found that the inverse transmission-line matrix modeling is capable for the sound source identification. The sources are not identified for the case that the separation of measurement points is lager than the wavelength of objective sound. Through the experiments under water, the measured wave forms at the several position in front of the ultrasonic transducer qualitatively agree with the calculated TLM solutions for the forward propagation process. The measured wave forms are then inputted into the computer program developed for the inverse propagation. It is confirmed that the sound waves propagate reversely to the sound source.