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intro to Aud. Ch 4
Audiometers
| Question | Answer | xtra info |
|---|---|---|
| portable audiometer | used for screening-not diagnosis | |
| clinical audiometer | not portable-set up in sound rooms | |
| attenuator dial (intensity) | makes sound softer in dBHL | it's like the volume dial |
| switch | allows you to present the tone | |
| output selection | directs the tone to either earphone-red=right, blue=left | you can only test one ear at a time. |
| types of output | 1.headphones (for air-conduction testing), 2.loud speaker (sound-field testing), 3.bone conduction vibrator (bone-conduction testing) | |
| speech audiometer | input select, amplifier, Vu-meter, attenuator, output selection | |
| input select (on a speech audiometer) | us a microphone to talk, cd player or tape player | |
| amplifier | internal part that makes sound as loud as it can be | |
| Vu-meter | displays a signal level in Volume Units | |
| Daily listening check (biological check) | a test of the equipment to make sure it's working | check list: intensity, frequency, cords, switch, both headphones, bone vibrator |
| ANSI | American National Standards Institute | sets the standards for audiometer manufacturers |
| testable frequencies for portables | 125, 250, 500, 750, 1000, 1500, 2000, 3000, 4000, 6000 and 8000Hz | |
| Oscillator (frequency) | produces tones of discreet frequencies at octave intervals | |
| range of intensities for portable | -10dB HL to 110 dB HL in steps of 5db HL | |
| bone conduction testing range | 250 - 4000 Hz | |
| dB HL | hearing level | |
| HTL | hearing threshold level | |
| ear sensitivity level | 1K - 3K Hz | |
| Golden Ears | people who can hear .0002 dynes/cm2 | there are very few people who have this hearing |
| RETSPL | reference equivalent threshold sound pressure | |
| reference for db HL | the softest sound for average normal hearing (not the golden ears) | it varies by frequency |
| if attenuator is set at 0dB HL and oscillator is set at 125Hz, the output is? | 45 dB SPL | |
| if attenuator is set at 0dB HL and oscillator is set at 250Hz, the output is? | 25.5 dB SPL | |
| if attenuator is set at 0dB HL and oscillator is set at 500Hz, the output is? | 11.5 dB SPL | |
| if attenuator is set at 0dB HL and oscillator is set at 1KHz, the output is? | 7 dB SPL | |
| if attenuator is set at 0dB HL and oscillator is set at 2KHz, the output is? | 9 dB SPL | |
| if attenuator is set at 0dB HL and oscillator is set at 4KHz, the output is? | 9.5 dB SPL | |
| if attenuator is set at 0dB HL and oscillator is set at 8KHz, the output is? | 13.0 dB SPL | |
| Audiometer (pure tone) | a device used to determine the threshold of hearing | contains an oscillator dial, amplifier, attenuator dial, switch, and output selection |
Created by:
schaunag
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