Unitron TrueFit software instruction guide v2.2
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4. Select the frequency region(s) and parameter type (MPO, Gain , CR or TK) to be
modified.
• To select an individual frequency region, select the desired value in the table.
• A range of fitting values can be selected by choosing a specific parameter label
(MPO, Gain, CR or TK). The selected frequency region(s) is highlighted in the table
and shaded in the fitting graph.
• TK soft speech can be used to adjust the gain for low level sounds. Impact of the
adjustments is opposite to the other controls: increasing TK soft speech will
decrease gain for low level sounds and vice versa.
• To select multiple frequency regions for adjustment, you can also click and drag
across the table. The slider bar along the bottom of the table allows you to view
frequency regions that are outside the visible table area.
• To view all frequency regions for a particular ear, and/or increase the size of the
selectable boxes in the table, click on the View right ear only or View left ear only
text as appropriate. To change the table view back to a binaural view, click on the
text View both ears.
• Once you have selected your desired region and parameter type for adjustment,
click the dB drop-down menu to alter the step size of any change. Choose from 1, 2
or 3 dB.
• Click the + or - buttons to apply the desired change.
Note: When a fitting handle has reached its maximum setting, the + button will grey
out (disable). Conversely, if a fitting handle is at its minimum setting, the - button will
grey out (disable)
Note: The compression ratios are calculated based on the slope of the I/O curve
between the TK soft and TK loud inputs.
Frequency Compression
Note: This option is available with Max products.
1. Click the Frequency Compression task item at the bottom of the screen.
2. Select the program you wish to modify using the program selector list described above.
Note: This feature is global within the Automatic Program and can be set
independently for each of the manual and wireless programs.
3. Click the Enable Frequency Compression check box to activate / deactivate this
feature.
Note: This feature is activated by default.
4. Adjust the Frequency Compression to the desired setting using the More or Less
buttons. Adjusting the frequency compression impacts:
• The frequency at which the compression will begin. Below this specified cut-
off, no frequency compression will be applied.
• The compression ratio or the amount of compression that will be applied in
the frequency domain above the cut-off frequency.
Note: The software will automatically calculate the starting default position of the
frequency compression based on the client's better ear audiogram and the fitting
formula. With the DSL v5 pediatric fitting formula, frequency compression default
settings are more aggressive (i.e. lower cut-off frequency, higher compression ratio)
to emphasize audibility of high frequency speech cues for children.
Note: For clients with asymmetrical hearing loss, the frequency compression settings
will be based on the audiometric thresholds from the better ear and applied to both
devices in binaural fittings.
Note: The shaded region on the slider reflects the frequency compression region
which is also displayed on the frequency response graphs.
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