H - Electricity – 04 – R
Patent
H - Electricity
04
R
349/26, 349/66
H04R 25/00 (2006.01) H04R 1/22 (2006.01) H04R 19/01 (2006.01)
Patent
CA 1309489
ABSTRACT OF THE DISCLOSURE 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.
587294
Bereskin & Parr
Knowles Electronics Inc.
LandOfFree
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