Patent ID: 6094150
Filing Date: 2000-07-25
Classification: G01H

Abstract:
A noise measuring system comprising:a microphone array placed on a predetermined microphone array axis and comprised of a plurality of microphone units for collecting sounds from mobile noise generators; anda directivity forming section for controlling a direction of directivity of said microphone array, said directivity forming section including delay means, connected to said plurality of microphone units, for delaying outputs of said plurality of microphone units and adding means for adding said outputs of said microphone units delayed by said delay means,an optimal value of a delay time of said delay means of said directivity forming section being set in such a manner that a noise isolation characteristic and a deterioration characteristic of a directivity of said microphone array balance with each other, said noise isolation characteristic causing any mobile noise generator not targeted for noise measurement to come off a directional plane or a directional line formed in said direction of directivity of said microphone array.