# 331 5.1 Clinical Decibel

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1. threshold of audibility
• MAF - minimum audible field
• MAP - minimal sudible pressure
2. testing hearing requires
speakers and a microphone
3. MAF
• minimum audible field
• hearing aids and speakers
4. MAP
• minimal audible pressure
• test hearing and microphone
5. cannot test...
pure tones on a speaker
6. low frequencies
• hear or feel?
• lowest = 20 Hz
• lower than 20 Hz you feel but dont hear
7. high frequencies
• top end = 20,000 Hz
• higher than this and you would hear your own heart beat
8. frequencies best for speech
1,000 - 4,000 Hz
9. Willis Beasley
• ASA 1951
• 1st portible audiometer
10. normal hearing
ages 18 - 25 years
11. best hearing is at
infancy, but is difficult to test on infants
ISO 1964
13. large revision of audiograms in
1996
14. ANSI 1969
American National Standards Institute
15. ASA
Audiologist Society of Australia
16. ISO
International Society of Audiology
17. hearing test accuracy is..
+/- 5 dB
18. normal people can hear
70 dBspl
19. dBhl
• hearing level or hearing threshold level
• normal hearing for everyone
• 0 dBhl = threshold for normal hearing
20. if you have a 60 dBhl then you cannot hear
anything below 60 dBhl and you are 60 away from normal
21. dBsl
• sensation level
• the amount you are above a patient's threshold
• 0 dBsl = threshold for a particular patient
22. if a patient's threshold is 50dBhl you would test..
above that, say 70 dBhl, so that you would be at 20 dBsl
23. 0 dBhl @ 1000 Hz = 7dBspl
70 dBhl @ 1000 Hz = __dBspl
60 dBhl @ 1000 Hz = __dBspl
• 77
• 67
24. 0 dBhl @ 2000 Hz = 9 dBspl
50 dBhl @ 2000 Hz = __dBspl
59
25. 0 dBhl @ 1000 Hz = 7 dBspl
Abby threshold @1000 Hz = 30 dBhl

__dBspl --> 60 dBhl = 67 dBspl
67
26. 0 dBhl @ 1000 Hz = 7 dBspl
Abby threshold @1000 Hz = 30 dBhl

10 dBspl --> __dBhl
40
27. 50 dBhl --> __dBsl
20
28. 40 dBsl --> __dBspl
• 40 dBsl --> 70 dBhl
• 70 dBhl --> 77 dBspl

## Card Set Information

 Author: shanamd2010 ID: 131684 Filename: 331 5.1 Clinical Decibel Updated: 2012-01-30 18:15:43 Tags: clinical decibel Folders: Description: CDO 331 Show Answers:

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