Pressure-matching-based 2D sound field synthesis with equivalent source array
* Presenting author
Pressure matching(PM) Method is one of well-known effective methods for physical sound field synthesis using massive loudspeaker array. In PM method, to match a sound pressure at each matching point as the desired one, all transfer functions between the loudspeakers and matching points must be measured. Thus, as the number of matching points and loudspeakers increases, it is more difficult to measure the transfer functions by using a microphone. In addition, it is also difficult to place a microphone with high accuracy without a robot or massive microphone array. In this paper, we proposed a method of local sound field synthesis with PM method without large-scale measurements by estimating transfer functions between the loudspeakers and the matching points from transfer functions between the loudspeakers and small number of control points. By sparse optimization, each equivalent source of the loudspeaker is selected from a dictionary of mono pole sources placed near each loudspeaker based on small number of transfer functions.Driving functions of loudspeaker can be derived from transfer functions between a lot of virtual matching points and all equivalent sources. To evaluate our proposed method, two-dimensional simulation experiments are conducted.