MIDIMATE 602 & 622 Diagnostic Audiometers
16
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.
