THE MULTICHANNEL SOUND FIELD CONTROL-SYSTEM IN A MULTIPURPOSE HALL

In this study, the effect of a digital sound field control system (DSFC) with loudspeakers arranged three-dimensionally in a multi-purpose hall is discussed. A method is presented of making the tap data set up in the DSFC, based on simulated reflection patterns using the usual ray tracing method. Each reflection is ultimately divided into two vectors which make phantom images when they are reproduced by two loudspeakers, while the three-dimensional information of reflection pattern is comparatively preserved. The advantage of this method is that reflections can be produced using small sized hardware. One application of DSFC based on this method is shown in an existing shoebox-type multi-purpose hall, where one side of the wall is flat and hard, while another wall facing it is covered with diffusers, and the reflection patterns of this hall are very unique. The target reflection patterns can be obtained in this specific hall by using the DSFC.