Operating Instructions MA 53
Geba_MA53_e_13a.doc
28 851 430/3 11/11
5.4 Speech Audiometry
The speech-recognition threshold SRT is the hearing threshold for speech. It is
the lowest level at which the patient correctly recognizes the stimuli 50% of
the time. Usually, recognition is indicated by repetition of the speech-stimulus
item. The speech test can be done with recorded speech test material from
CD or tape or with the microphone and live voice using standardized word
lists. Different methods for speech tests are standardized worldwide such as
the ASHA guidelines for determining the threshold level for speech (Asha 21,
page 353-356).
Explain to the patient that he should repeat each word he hears.
The patient should sit at a distance of at least 1 m from the device.
Eliminate any obstructions which will interfere with the placement of the
earphone cushions on the ear (i.e. hair, eyeglasses).
Ensure the headphones are put on correctly: Red side on the right, blue side
on the left. Adjust the headband of the headphones so that the receivers are
at the correct height (the sound output grid exactly facing the ear canal)
Set the receiver selectors
and
to AC and the signal selectors
and
both to TAPE/CD (if you are using recorded speech test material) or to MIC (if
you wish to perform a speech test with live
speech).
On the LCD-display
the initial setting for
speech audiometry (see picture 36)
appears. The percent speech discrimination
score is displayed in the middle. Below this,
the number of correct and incorrect words
is shown.
If you are using CD or tape, put the monitor phone on to hear the test words.
Depending on your test method, use the level control knob
or
↔ to set the
start level.
Perform the test words.
Tally the correct words by pressing the
frequency up key
or
→.
Tally the incorrect words by pressing the
frequency down key
or
.
When you finish a word list, note the
percentage of the speech discrimination score.
Picture 36 MA 53 display with
initial settings for speech audiometry
Picture 37 MA 53 display with
typical result for speech audiometry
Содержание MA 53
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