Verifit
®
User's Guide Version 4.8 © November 2016
1. Refer to On-ear Measures – Setup to prepare the system for use and for proper positioning of the client and
the probe tube.
2. Click on in any of the test areas.
3. Select a noise stimulus type from the list box.
4. Select a stimulus level in dB SPL from the list box.
5. Click to begin the test.
6. Click to capture the comparison curve once the noise reduction function has responded.
7. At any point click to stop the test without recording any data.
On-ear noise reduction stimuli
Noise reduction offers the following stimuli for evaluating the noise reduction performance of a hearing
instrument.
Air conditioner is an example of the noise created by a household air conditioner.
Vacuum is a sample of noise from th operation of a vacuum cleaner on a carpeted floor.
Multi-talker Babble is the combination of ten different adult talkers; seven of the talkers are female and three
are male. Eight of the talkers are speaking English, one is speaking French, and the last one is speaking German.
All talkers were normalized to the same overall output level before being positioned at random positions around
the listener. Loudness smoothing was performed on the babble in 1/3
rd
octave bands to reduce the magnitude of
short-term peaks and valleys.
On-ear manual control
1. Refer to On-Ear Measures - Setup to prepare the system for use and for proper positioning of the client and
the probe tube.
2. Right-click the mouse to raise the Home prompt and select [Manual control] under On-ear.
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