Automatic calibrating apparatus and method for second-order grad

Details Automatic calibrating apparatus and method for second-order grad Automatic calibrating apparatus and method for second-order grad

1989-12-29

1991-07-02

Ng, Jin F.

Electrical audio signal processing systems and devices

Monitoring/measuring of audio devices

381170, 381 92, 367 13, H04R 2900

Patent

active

050292153

ABSTRACT:
An automatic calibration system for a second-order gradient microphone is provided to ensure optimum sensitivity balance between a pair of first-order gradient microphones mounted in a housing and forming the second-order gradient microphone. Automatic calibration is achieved through use of a transducer also mounted in the housing and located equidistant acoustically between the two first-order gradient microphones. Under the control of a computer, the transducer is directed to generated sound pressure which is used to calibrate the gain of amplifiers respectively associated with each one of the first-order gradient microphones for obtaining maximum directional sensitivity for a second-order directional response pattern. Such a system not only allows the use of inexpensive, non-matched microphones, but also obviates the need for factory calibration. Since the system is configurable to optimize itself automatically prior to use, calibration may be maintained regardless of aging, environmental stresses and parts replacement.

REFERENCES:
patent: 4311874 (1982-01-01), Wallace, Jr.
patent: 4536887 (1985-08-01), Kaneda et al.
patent: 4742548 (1988-05-01), Sessler et al.
patent: 4887300 (1989-12-01), Erling

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