Affinity
2.0
Additional Information Page 46
2) Select microphone, CD, or wave file in the channel 1 input list. The Knaster test can be performed
on left, right or both ears. This is selected in the channel 1 output list.
3) Set the level of the input to the level of maximum speech understanding using the dB HL
Decrease/Increase channel 1 buttons.
Channel 2 presents the Knaster noise which should be set to a level of 5 -10 dB below the level of
the speech input using the dB HL Decrease/Increase channel 2 buttons.
4) Set the desired filter for the low and high frequencies respectively below the graph. The filter applied
can be visualized in the graph.
5) Explain to the patient, that they will now hear both speech and noise through the headphones. They
should, however, concentrate on the speech and try to repeat what they hear. If they make a mistake
the noise will be a little louder for just a second and they will have another chance to repeat the word
correctly.
6) Start presenting the speech material. If mistakes between sounds are made the noise is increased
for a few seconds in attempt to "awaken" the sensorineural cells. The noise is then turned down to its
original level and the patient is prompted to try and correct the mistake and the repeat the word
again. If the noise is muted at the same time as the mistaken word is repeated for the second time it
will be easier for the patient to perceive it. This is done by touching the channel 2 Stimuli area with
the mouse. When succeeding to repeat the word correctly the patient should be made aware of
the difference between the sound they emitted and the correct sound.
Note: If you wish to switch between right and left during the Knaster training without the intensity
returning to the original start level, please be sure to enter the Common settings in the AC440 setup
(Menu/setup/AC440 setup, see section 1.7.2.1) and select “OFF” in the Default intensity when
changing output dropdown list like illustrated below:
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