FRCS Audiology

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Author:
esmond
ID:
175069
Filename:
FRCS Audiology
Updated:
2016-01-05 10:57:53
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FRCS Audiology
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FRCS Audiology
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  1. dB types
    dB SPL = sound pressure level,  hearing aid performance, for each 20 dB increase sound intensity increases X10, threshold for detectability = 20 micropascals = 0 dB @1KHz

    dB HL - hearing level, 0 dBHL therefore represents the threshold of detectability of each frequency for a normally hearing population

    dBA - weighted scale, sound field assessments,
  2. Stimulus
    • •Clicks (not freq specific)
    • –Narrow band (2-4kHz)
    • – Broad or wide band (1-4kHz)

    • •Pure tone (freq specific eg 1,2,3,4kHz)
    • –Tone burst (overall length >20ms)
    • –Tone pips (overall length <20ms)

    –Tone burst has a defined start (rise time),duration (plateau) and end (fall time); the plateau is longer than therise/fall time.

    –Tone pips usually has a plateau which is the same or shorter than the rise/fall time
  3. Otoacoustic emissions
    • Stimulus - broadband click 1-4 KHz, upward & downward deflection, ,1MS, 82 Db +/- 7
    • Probe stability >80%=good
    • Ratio - signal to noise ration @ 1,1.5,2,3,4 Khz >/ 3,3,6,6,6
    • Need 3/5 to pass
    • Red = noise, blue=emission
    • Quiet ΣN = number of accepted responses
    • Frequency band reproducability % (should be greater than 50%)
    • Pass= hearing thresholds>30db

  4. Vibrotactile thresholds
    • 25dB @ 250Hz
    • 55 dB @ 500Hz
    • 70dB @ 100Hz
  5. Rules of masking
    • Rule 1
    • Difference between not masked AC ≥ 40dB

    • Rule 2
    • Not masked BC is more acute than AC threshold by ≥ 10dB

    • Rule 3
    • Where rule 1 not applied and the BC of one ear is more acute by ≥40dB than the unasked ac threshold of the other ear

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