Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1989-01-03
1989-09-19
Fuller, B. R.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
181135, 181160, 381 686, 381 692, 381159, H04R 2500
Patent
active
048672670
ABSTRACT:
This invention is concerned with a hearing aid including a microphone, an adjustable amplifier, and an acoustic transducer positioned within a first, large acoustic chamber defined by an in-the-ear housing. The acoustic transducer is in communication with a sound outlet passage which leads into the user's ear canal. The acoustic transducer includes a sound generating diaphragm driven by an acoustic driver. The diaphragm and driver are mounted in the acoustic transducer, with the diaphragm dividing the transducer into second and third acoustic chambers. A vent passage is provided between the first and third acoustic chambers. An acoustic resistance is mounted in the vent passage to modify the operating characteristics of the hearing aid.
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Beranek, Leo L., "Acoustic Measurements", 1949, p. 225.
Olson, Harry F., "Acoustical Engineering", 1957, pp. 262-263.
Fuller B. R.
Industrial Research Products, Inc.
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