Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1988-01-27
1989-08-01
Fuller, B. R.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
181132, 181135, G10K 1100, H04R 2502
Patent
active
048526835
ABSTRACT:
An earplug uses damping to render unimportant a Helmholtz resonance between the acoustic mass intrinsic to a sound channel thereof and the compliance of air in the earcanal unimportant, in combination with an external structure coupled to the sound channel to increase response characteristics at higher frequencies in a predictable and well controlled manner in order to provide a highly desireable uniform frequency response.
REFERENCES:
patent: Re29487 (1977-12-01), Gardner, Jr.
patent: 3565069 (1971-02-01), Miller
patent: 3800101 (1974-03-01), Milani
patent: 4349082 (1982-09-01), Gastmeier
Killion et al., The Hearing Journal, "An Earplug with Uniform 15-dB Attenuation", 1988, vol. 41(5), pp. 14-17.
Etymotic Research, "Tubephone, ER-3A Insert Earphone", Aug. 1987, data sheet.
The Etymotic Update, "Progress Report on ER-15 Musician's Earplug", Dec. 1988, pp. 1-2.
Fortune, "Great Moments in Workplace Safety", Jan 18. 1988, pp. 165, 168.
E. H. Berger et al., Noise and Hearing Conservation Manual, "Auditory Effects of Noise", 1986, pp. 197, 204-208.
E. H. Berger et al., Noise and Hearing Conservation Manual, "Audiometric Data Base Analysis", 1986, pp. 293, 314-315.
Killion, Journal of Speech and Hearing Disorders, "Earmold Options for Wideband Hearing Aids", 1981, pp. 10-20.
Etymotic Research Inc.
Fuller B. R.
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