Noise cancelling microphone

Details Noise cancelling microphone Noise cancelling microphone

1993-05-10

1994-07-12

Kuntz, Curtis

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Thermal response to, or generation of, sound vibration

381122, 181158, H04R 2500, G10K 1300

Patent

active

053295935

ABSTRACT:
A noise cancelling microphone for use in noisy environments is disclosed wherein noise entering the front portion of the microphone housing to impinge upon the microphone cartridge diaphragm is also permitted to enter proximate the rear portion of the microphone housing through strategically located inlet openings. This allows noise to impinge upon the back surface of the microphone cartridge diaphragm to effect a cancellation of diaphragm vibrations. These strategically located inlet openings at the top and the bottom of the rear of the microphone housing are situated so as to be directionally orientated towards the greatest source of the noise, namely orthagonal to the directional line of the front inlet openings and out of the path of the incoming air. The size and number of the top and bottom rear inlet openings are regulated and situated so that as the microphone is used in such a setting as a motorcycle rider, they are vertically oriented since the greatest source of noise (outside of horizontal wind) is above or below the operator.

REFERENCES:
patent: 3876843 (1975-04-01), Moen

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