ACOUSTIC FIELD EVALUATION DEVICE, ACOUSTIC FIELD EVALUATION METHOD, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide an acoustic field evaluation device capable of outputting a well-interpretable analysis result from a view point of perception based on data collected from an acoustic field.SOLUTION: An acoustic field evaluation device includes: a time domain FFT unit for executing fast Fourier transformation of a time domain to a circular array comprising arranging the other N pieces of microphone on the circumference with a center microphone as a center and also to recording signals of N+1 channel from the circular array and acquiring signals of N+1 channel for M pieces of the frequency; a phase extraction unit for extracting a phase difference from the signals of the center microphone of the signals of the N channels on the circumference for M pieces of the frequency; a space domain FFT unit for executing the fast Fourier transformation of the space domain to the phase difference of the signals of N channels for M pieces of the frequency; an amplitude extracting unit for extracting an amplitude of a second fundamental wave based on the result of the fast Fourier transformation of the space domain of the N channels for M pieces of the frequency; and a curvature extraction unit for extracting a curvature of an incoming wave surface for M pieces of the frequency based on the amplitude of the second fundamental wave.