System and method of measuring noise of mobile body using a plur

Details System and method of measuring noise of mobile body using a plur System and method of measuring noise of mobile body using a plur

1998-08-06

2000-07-25

Williams, Hezron

Communications: electrical

Vehicle detectors

Sonic or ultrasonic

701 1, 701301, 367135, 367127, 381 92, B60Q 500

Patent

active

060941502

ABSTRACT:
In a noise measuring system comprising a microphone array and a directivity forming section for controlling the direction of directivity of the microphone array, the directivity forming section includes delay section and adding section, and the optimal value of a delay time of the delay section is set in such a manner that a noise isolation characteristic for causing any mobile noise generator not targeted for noise measurement to come off a directional plane or a directional line formed in the direction of directivity of the microphone array and a deterioration characteristic of the directivity of the microphone array balance with each other.

REFERENCES:
patent: 4509149 (1985-04-01), Ruehle
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patent: 4703506 (1987-10-01), Sakamoto et al.
patent: 5473701 (1995-12-01), Cezanne et al.
patent: 5798983 (1998-08-01), Kuhn et al.
patent: 5878367 (1999-03-01), Lee et al.
patent: 6021364 (2000-02-01), Berliner et al.

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