MOTOR BICYCLE HELMET HAVING NOISE-CONTROLLING FUNCTION

摘要

PURPOSE: To provide a motor bicycle helmet having noise-controlling function capable of suppressing windage sound which is a great distress to a motor bicycle rider. ;CONSTITUTION: This helmet is composed of the main body (1) of a helmet covering the head of a wearer, microphones (2R, 2L) and speakers (3R, 3L) placed close to the ears of the wearer inside the main body (1) of the helmet and an electric circuit (4) for supplying the speakers (3R, 3L) with electric signals which are obtained by reversely converting the phases of the electric signals output from the microphones (2R, 2L).;COPYRIGHT: (C)1996,JPO