Microphone with frequency pre-emphasis channel plate

Details Microphone with frequency pre-emphasis channel plate Microphone with frequency pre-emphasis channel plate

1988-01-21

1989-06-06

Ng, Jin F.

Electrical audio signal processing systems and devices

Sound effects

Reverberators

181129, 181158, 181161, 381153, 381154, 381158, 381161, 381168, 381174, H04R 2500, H04R 120

Patent

active

048378330

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.

REFERENCES:
patent: 3014099 (1961-12-01), Fiala
patent: 3124663 (1964-03-01), Beaudry
patent: 3159719 (1965-12-01), Weiss
patent: 3168934 (1965-02-01), Wilson
patent: 3381773 (1968-05-01), Schenkel
patent: 3588383 (1970-02-01), Carlson
patent: 3963881 (1976-06-01), Fraim et al.
patent: 4006321 (1977-02-01), Carlson
patent: 4450930 (1984-05-01), Killion

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