Region Separation Control for Broadband Sounds by Multiple Sources

In this paper, we propose a method to reproduce different broadband sounds in different regions in the same sound space by appropriately controlling multiple sound sources. To achieve this, it is necessary to design a suitable filter that enables broadband control in the time domain. The procedure of this method is shown below. Firstly, obtain the transfer function from the sound sources to the control points at each target frequency. Secondly, the frequency characteristics of the control filter of each sound source using acoustic contrast control (ACC) based on the transfer function and find the impulse response of the control filter by performing discrete inverse Fourier transformation. Finally, by passing the input signal of a sound source through its corresponding control filter, the sound space can be divided into an acoustically bright zone and a dark zone. Simulations and experiments are conducted, and the results show that the proposed method is effective to deliver different time series signals to different regions properly. Also, we consider the cause of reverberant-like noise that occurs during control.