The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 12, 1994
Filed:
May. 10, 1993
John J Lazzeroni, Tucson, AZ (US);
Melinda K Carevich, Tucson, AZ (US);
Other;
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.