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:
Jan. 25, 1994
Filed:
Apr. 01, 1992
Carl R Anderson, Wilmette, IL (US);
Shure Brothers, Incorporated, Evanston, IL (US);
Abstract
A bi-directional noise-cancelling microphone comprising a detector for detecting acoustical signals centrally positioned within a tubular member that has flared entries. The microphone provides a bi-polar response pattern, and effectively cancels unwanted noise incident upon the microphone at the sides of the tubular member, as well as noise above a particular frequency dictated by the length of the tubular member. By providing flared entries to the tube, the maximum peak response frequency of the microphone is extended up to 40% higher than that achieved with a similar tubular member with non-flared entries. An embodiment of the tubular bi-directional microphone with flared entries is disclosed wherein the microphone is provided with a two-stage pop filter system. The pop filter system includes a first screen covering the front entry of the microphone housing. A second screen is constructed so as to vent the first screen, thereby preventing pop signals from being produced.