Testing With Speech; Live Speech Testing; Setting Up The Test; Testing The Speech Reception Threshold - otometrics Madsen Midimate 602 Quick Manual

MIDIMATE 602 & 622 Diagnostic Audiometers

5 Testing with Speech

5.1

Live speech testing

5.1.1

Setting up the test

To set up a test of a patient's live voice threshold, do as follows:
1. Connect either the monitor headset with boom microphone or a monitor loud-
speaker and talkover/live voice microphone via the monitor adaptor to Monitor
on the rear panel. If you use the monitor loudspeaker and talkover/live voice mi-
crophone, you should speak the words into the microphone with a fixed distance
of about 20 cm between your mouth and the microphone.
2. Place the patient in a sound cabin to make sure that the live voice is heard only
via the MIDIMATE 602/622. If no sound cabin is available fit the patient with an
ME 70 noise-excluding headset to prevent threshold levels which are nearly nor-
mal from being influenced by directly transmitted live voice.
3. Press Menu to display the Select Function menu.
4. Press Softkey 2 to select Speech and display the Output menu.
5. Press Softkey 1 to select Air and display the Stimulus menu.
6. Press Softkey 1 to select Left and display the Input menu.
7. Press Softkey 2 to select Micr. and display the Masking Output/Input
menu.
8. Press Softkey 1 to select No Mask unless there is a risk of a response from the ear
not being tested. This may be the case either because of widely differing thresh-
olds, or because the test is to be made at a level well above threshold. For mask-
ing, press Softkey 2 to use white noise (WN), or Softkey 3 to use speech noise
(SN), which is white noise filtered so that speech frequencies predominate.
9. Press and hold the Microphone pushkey on the Level panel and turn any of the
three rotary wheels while you read aloud from a word list. Use a word list, where
the words have been expressly prepared for threshold measurements in order to
obtain a peak deflection of 0 dB on the Stimulus VU indicator. (0 dB corresponds
to normal threshold.) Make sure that the level, the pace and the distance from the
microphone of the live voice used for setting up is the same as for the actual test.
5.1.2

Testing the speech reception threshold

The patient's speech reception threshold is defined as the sound pressure level for
which the patient can repeat correctly 50% of the words in a spoken list. Each of the
words used for this test is of two syllables stressed equally (spondees). To test the
patient, do as follows:
1. Instruct the patient carefully in how to repeat each word he hears.
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