Surgery – Truss – Pad
Patent
1994-08-26
1996-06-18
McElheny, Jr,, Donald
Surgery
Truss
Pad
G06F15900
Patent
active
055268196
ABSTRACT:
Apparatus and method are disclosed for the recording of distortion product emission (DPE) levels in human beings. At least one microphone and a sound-delivery system is inserted in the external ear canal in a manner similar to that required to position a small hearing aid. Two primary tones T.sub.f1, T.sub.f2 are applied simultaneously to the ear. The cochlea of the inner ear produces a DPE tone which is sensed by the microphone. DPE levels are sensed as a function of input frequencies f.sub.1 and f.sub.2. Such DPE frequency is equal to 2f.sub.1 -f.sub.2. Such DPE frequencies are collected in 100 Hz steps by adjusting f.sub.1 and f.sub.2 and maintaining a substantially constant ratio between f.sub.1 and f.sub.2. Two output forms are created: an DPE audiogram and a DPE input/output function. Noise picked up by the microphone is reduced by averaging the DPE signal many times, yet causing each of the DPE signals that is averaged to be of the same phase as every other DPE signal. Random phase noise is reduced by the averaging process. Body noise may be reduced by using two microphones and applying the output of one such microphones to the plus input of a differential amplifier. The output of the other less sensitive microphone, after amplification and phase adjustment is applied to the negative input of such differential amplifier. The output of such amplifier results with the body noise signal substantially reduced, but with the DPE signal substantially unchanged. This abstract of the disclosure-is not intended to define the scope of the invention.
REFERENCES:
patent: 4374526 (1983-02-01), Kemp
patent: 4459996 (1984-07-01), Teele
patent: 4589137 (1986-05-01), Miller
patent: 4630304 (1986-12-01), Borth et al.
patent: 4636586 (1987-01-01), Schiff
patent: 4649505 (1987-03-01), Zinser, Jr. et al.
patent: 4653102 (1987-03-01), Hansen
patent: 4672674 (1987-06-01), Clough et al.
patent: 4684989 (1987-08-01), Roeder
patent: 4716907 (1988-01-01), Nakamura
patent: 4884447 (1989-12-01), Kemp et al.
patent: 5033082 (1991-07-01), Eriksson et al.
patent: 5267571 (1993-12-01), Zurek et al.
Journal of Acoustical Society of America, vol. 78, No. 5, Nov. 1985, Horner, et al., "Distortion Product Otoacoustic Emissions in Hearing-Impaired Mutant Mice", (Abstract Only).
J. Otolaryngol., vol. 18, No. 7, 1989, Kimberley et al., "Distortion Product Emissions and Sensorineural Hearing Loss" (Abstract Only).
Hear Ros., Jan. 1984, vol. 13, No. 1, Brown et al., "Suppressibility of the 2f1-f2 Stimulated Acoustic Emissions in Gerbil and Man" (Abstract Only).
D. T. Kemp, Stimulated acoustic emissions from within the human auditory system. Journal of Acoustical Society of America; vol. 64; pp. 1386-1391; Nov. 1978.
D. T. Kemp, Evidence of Mechanical Nonlinearity and Frequency Selective Wave Amplification in the Cochlea; Archives of Otorhinolaryngology; vol. 224; pp. 37-45; 1979.
Kemp, Bray, Alexander, Brown; Acoustic Emission Cochleography-Practical Aspects; Scand Audial Suppl.; vol. 25; pp. 71-95; 1986.
Bray and Kemp, An advanced cochlear echo technique suitable for infant screening; British Journal of Audiology vol. 21, pp. 91-204; 1987.
Harris, Lonsbury-Martin, Stagner, Coats, Martin; Acoustic distortion products in humans: Systematic changes in amplitude as a function of f.sub.2 /f.sub.1 ratio; J. Acoustic Society of America; vol. 85; pp. 220-229; exact date unknown, Jan. 1989 printed on copy of paper.
Schmiedt, Acoustic Distortion in the ear canal, I. Cubic different tones: Effects of acute noise injury; J. Acoustic Society of America; vol. 79(5) pp. 1481-1490; May 1986 (date printed on publication).
Schmiedt et al, Ear-canal acoustic emissions as frequency,-specific indication of cochlear function; J. Acoustic Society of America Supplement 1; vol. 72 p. 56; Fall, 1982,
Kemp and Brown; An Integrated View of Cochlear Mechanical Nonlinearities Observable from the Ear Canal; unknown publication, volume, page and date.
D. T. Kemp; Otoacoustic emission, traveling waves and cochlear mechanism; Hearing research (Elsevier Science Publishers B.V. (Biomedical Div.)); vol. 22; pp. 95-104; 1986.
Schmiedt; Acoustic injury and the physiology of hearing; J. Acoustic Society of America; vol. 76(5); pp. 1293-1317; Nov. 1984 (printed on pages).
Lonsbury-Martin Brenda L.
Martin Glen K.
Baylor College of Medicine
McElheny, Jr Donald
Poinvil Frantzy
LandOfFree
Method and apparatus for distortion product emission testing of does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for distortion product emission testing of , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for distortion product emission testing of will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-216765