Most of effectors used for electrical music instruments provide some temporal changes to sounds. If effectors aimed at spatial expressions had been developed, artists could have a new performance. We propose a Sound Field Effector using a loudspeaker array. Various sound fields such as a focus can control in real time by sound engineering and/or artists. The Sound Field Effector is mainly divided to software parts and hardware parts. A 16ch. System was developed as a prototype. The system can change sound fields within 1 msec. A focal pattern produced with the system was measured in an anechoic room.
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