Abstract
Multiple listening positions are assumed in a sound system such as the car audio system or the BGM system in a retail premise. Thus it is necessary to control the sound field in a room to obtain better frequency responses at multiple listening positions. There are several methods to control the sound field, i.e. spatial distribution of sound pressure in a room. One is manipulating the geometrical conditions like location of acoustic sources or shape of the room itself. The other is using multiple acoustic sources with multiple digital filters. By manipulating the difference in magnitude and phase response between multiple sources with digital filters, the spatial distribution of sound pressure in the room varies owing to the sound wave interference. This paper presents a concrete procedure of acoustic design in a room which is intended to obtain uniform and flat frequency responses at multiple positions by using optimization method.
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