331 5.1 Clinical Decibel

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threshold of audibility
- MAF - minimum audible field
- MAP - minimal sudible pressure
testing hearing requires

speakers and a microphone
MAF
- minimum audible field
- hearing aids and speakers
MAP
- minimal audible pressure
- test hearing and microphone
cannot test...

pure tones on a speaker
low frequencies
- hear or feel?
- lowest = 20 Hz
- lower than 20 Hz you feel but dont hear
high frequencies
- top end = 20,000 Hz
- higher than this and you would hear your own heart beat
frequencies best for speech

1,000 - 4,000 Hz
Willis Beasley
- ASA 1951
- 1st portible audiometer
normal hearing

ages 18 - 25 years
best hearing is at

infancy, but is difficult to test on infants
Dadson and King

ISO 1964
large revision of audiograms in

1996
ANSI 1969

American National Standards Institute
ASA

Audiologist Society of Australia
ISO

International Society of Audiology
hearing test accuracy is..

+/- 5 dB
normal people can hear

70 dBspl
dBhl
- hearing level or hearing threshold level
- normal hearing for everyone
- 0 dBhl = threshold for normal hearing
if you have a 60 dBhl then you cannot hear

anything below 60 dBhl and you are 60 away from normal
dBsl
- sensation level
- the amount you are above a patient's threshold
- 0 dBsl = threshold for a particular patient
if a patient's threshold is 50dBhl you would test..

above that, say 70 dBhl, so that you would be at 20 dBsl
0 dBhl @ 1000 Hz = 7dBspl
70 dBhl @ 1000 Hz = __dBspl
60 dBhl @ 1000 Hz = __dBspl
- 77
- 67
0 dBhl @ 2000 Hz = 9 dBspl
50 dBhl @ 2000 Hz = __dBspl

59
0 dBhl @ 1000 Hz = 7 dBspl
Abby threshold @1000 Hz = 30 dBhl

__dBspl --> 60 dBhl = 67 dBspl

67
0 dBhl @ 1000 Hz = 7 dBspl
Abby threshold @1000 Hz = 30 dBhl

10 dBspl --> __dBhl

40
50 dBhl --> __dBsl

20
40 dBsl --> __dBspl
- 40 dBsl --> 70 dBhl
- 70 dBhl --> 77 dBspl

Author

shanamd2010

131684

Card Set

331 5.1 Clinical Decibel

Description

CDO 331

Updated

2012-01-30T18:15:43Z