Tubular bi-directional microphone with flared entries

Details Tubular bi-directional microphone with flared entries Tubular bi-directional microphone with flared entries

1992-04-01

1994-01-25

Ng, Jin F.

Telephonic communications

Terminal

Housing or housing component

381155, 381157, 381168, 381169, H04M 100, H04R 2500

Patent

active

052822451

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.

REFERENCES:
patent: 1235510 (1917-07-01), Tigerstedt
patent: 2627932 (1953-02-01), Volkmann et al.
patent: 2790164 (1957-04-01), Oberg
patent: 3585317 (1971-06-01), Dvorsky
patent: 4009355 (1977-02-01), Poradowski
patent: 4232205 (1980-11-01), Ribeyre
patent: 4768614 (1988-09-01), Case
patent: 4817163 (1989-03-01), Stastny

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