ACTUATOR OF NOISE CONTROL DEVICE

摘要

PURPOSE:To improve an actuator of a noise control device constituted with loudspeakers outputting a cancel sound. CONSTITUTION:In an actuator of a noise control device which has a loudspeaker unit 2 canceling a noise included in exhaust gas near a tail pipe 1 releasing exhaust gas of an engine, a relaxation section 4 which forms a space in front of the loudspeaker in order to relax a peak and a dip of a reproduction frequency characteristic and produce efficiently a cancel sound is provided, the relaxation section 4 turns reflection of a cancel sound of the loudspeaker unit 2 toward an exit along an axis of the tail pipe 1 and performs optimization of reducing capacity. The relaxation section 4 is made double structure for the tail pipe 1, the outside of it is extended and throttled at an exit, and a clearance in which air is made to flow between the tail pipe is provided.