Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Thermal response to – or generation of – sound vibration
Patent
1992-10-13
1994-06-07
Kuntz, Curtis
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Thermal response to, or generation of, sound vibration
381 69, 381169, H04R 2500
Patent
active
053197178
ABSTRACT:
A microphone for a hearing aid having a modified high frequency response is disclosed. The hearing aid comprises a hollow housing having an upper wall, a lower wall and a depending wall disposed between the upper wall and the lower wall. The upper, lower and depending walls define a main chamber. The microphone further comprises an inlet tube extending outwardly from the depending wall for receiving sound and a diaphragm in continuous peripheral contact with the depending wall for substantially entirely dividing the main chamber into an input chamber in communicating relationship with the inlet tube and an output chamber. The input chamber presents an effective inertance to sound entering via the inlet tube. A structure is disposed within the input chamber between the diaphragm and the upper wall forming an elongated sound path. The elongated sound path increases the effective inertance of the input chamber to thereby lower the frequency of the peak response of the microphone to a frequency lower than the frequency of the peak response of a conventional receiver coupled thereto, to eliminate high frequency oscillations.
REFERENCES:
patent: 3560667 (1971-02-01), Carlson
patent: 4189627 (1980-02-01), Flanagan
patent: 4815138 (1989-03-01), Diethelm
patent: 4837833 (1989-06-01), Madaffari
patent: 4870688 (1989-09-01), Voroba et al.
Knowles Electronics, Inc.
Kuntz Curtis
Le Huyen D.
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