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:
Jun. 06, 1989
Filed:
Jan. 21, 1988
Peter L Madaffari, Elgin, IL (US);
Industrial Research Products, Inc., Elk Grove Villiage, IL (US);
Abstract
A high frequency emphasis microphone particularly adapted to a hearing aid application provides a steeply rising frequency response characteristic relative to frequency, and has a low pass sonic attenuator for providing to the undriven side of the microphone diaphragm a sonic counterpressure which at low frequencies substantially cancels ambient sound pressure delivered to the driven side of the diaphragm, the attenuator reducing this counterpressure at elevated frequencies to provide accentuated high frequency response. The attenuator includes a pair of inertance-forming restricted passageways passing a portion of incoming sound to a bypass port leading to the undriven side of the diaphragm, the passageways being defined by a U-shaped plate disposed within a chamber confronting the driven side of the diaphragm.