331 5.1 Clinical Decibel

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Author:
shanamd2010
ID:
131684
Filename:
331 5.1 Clinical Decibel
Updated:
2012-01-30 13:15:43
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clinical decibel
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Description:
CDO 331
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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
  12. Dadson and King
    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

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