SOUND FIELD COLLECTION REPRODUCING DEVICE, METHOD, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a wavefront synthesis technique for reproducing a wavefront on the sound source side of a microphone array.

SOLUTION: A frequency region transformation part 1 transforms a tone signal collected by a microphone array to a frequency region signal via Fourier transformation. A window function part 2 generates a post-window function frequency region signal by multiplying the frequency region signal by the window function. A space inverse Fourier transformation part 3 calculates an angle spectral representation of the post-window function frequency region signal via space inverse Fourier transformation. A space derivative part 4 calculates an angle spectral representation of the post-space derivative that is the product of the angle spectral representation and the coefficient corresponding to the derivative in a vertical direction of a microphone array surface. A space Fourier transformation part 5 transforms the angle spectral representation of the post-space derivative to a frequency region signal via space Fourier transformation. A time-domain transformation part 6 transforms the frequency region signal transformed via space two-dimensional Fourier transformation to a time-domain signal via inverse Fourier transformation.

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