Acoustic field control for region separation

Abstract

The present paper deals with the problem of reproducing different sounds in different areas in the same sound space. As a solution to this problem, find a filter that enables wideband control in the time domain by the method using Fourier transformation. Calculate the transfer function from each sound source to each control point for each frequency using Fourier transformation. Find the frequency characteristic of each sound source that controls the area using acoustic contrast control (ACC) based on the transfer function, and find the filter for controlling by performing discrete inverse Fourier transformation. Passing the input signal through its filter allows the input sound to be divided into a bright zone (area that sound can be heard) and dark zone (area that sound can’t be heard) in the control area. By applying this method, simultaneous reproduction of different time series signals in different area becomes possible.