To access the Fitting Setup Menu select <SET> under the Fitting sub-tab.

Fitting setup: Channel selection tab

Under the Channel selection tab personalize the settings for the hearing aid fitting. The user does not always have control over the settings; for example once data has been collected during the hearing aid fitting, channel adjustments can no longer be made (Figure 157). It is important to adjust the channel settings prior to starting the hearing aid fitting (Figure 157).

Figure 157: Fitting Setup window: data for the hearing aid fitting has not been collected and adjustments can be made

Figure 158: Fitting Setup window: data for the hearing aid fitting have been collected and adjustments cannot be made

Channel Selection for Channels 1 to 4

Different signals can be assigned to each of the four available channels. The signals you select appear in the fitting selection menu.

The following signals are available for each of the four channels:

When you present noise through more than one loudspeaker it is necessary to use two different noise sources. The same noise source cannot be played through two different speakers.

The signals selected in <SET> are displayed in the selection menu assigned to the loudspeaker being used. Referring to Figure 159, the selected speechtest is set in channel 1, the noise source 1 is set in channel 2, the noise source 2 is set in channel 3, and the babble of voices is set in channel 4. Changes made to <SET> would result in corresponding changes to the loudspeaker channels.

Figure 159: Organization of selected signals in the four loudspeaker channels

Stepwidth

Select the loudspeaker level increments to be used for the fitting. Increments can be selected from 1 dB to 10 dB and typically increments are set at 5 dB (Figure 160).

Figure 160: Image of increment levels which can be set for the loudspeaker levels

Level Summation

When several loudspeakers present the same level signal a total level exceeding the adjusted level may occur. 

To avoid this select <Consider level summation if equal signals>. This reduces the individual levels of the loudspeakers to ensure that the total levels correspond to the adjusted levels. This function is helpful to ensure that too high of levels are not presented during the fitting.

Counting

Counting can be done by selecting <5 or 10%> or <Projection> (Figure 161).

• Select <5 or 10%> for each counting impulse (via mouse or keyboard) to be valued with 5% or 10%.
• Select <Grossing up> to calculate the number of understood items in relation to the total number of items presented. 
• Select <Projection>

Figure 161: Counting options

Activate Second Amplifier/Activate Third Amplifier

If a second and third power amplifier are built in the unit, they can be switched on or off in the control unit of the system. This would permit a better overview of the operation.

When the second amplifier is activated 8 loudspeaker symbols appear. When the third amplifier is activated 12 loudspeaker symbols appear.

Speech Test

Source noise 1 and Source noise 2

*Speech noise is preferred for speech testing, as the noise and speech are matched in terms of spectral distribution characteristics.

Fitting Setup: The Presettings tab

Under the Presettings tab select specific "first fit" fitting settings.

Adjustments can be made here for a patient's initial fitting.  When a series of fittings have been saved for a patient, the previously saved settings will be used for the fitting.

When a fitting is deleted from the ACAM System, the presettings will also be deleted.

Figure 162: Presetting

There are two ways to change the Presettings (Figure 162):

1. Click through the individual measurements in the Presettings tab and select the loudspeakers to be activated, the signals to be selected, and the levels to be preset.
2. Click through the individual measurements in the actual fitting program and activate the individual tabs, the memories one after the other, and select the preferred default adjustments. Activate these setting by clicking <Use Current Adjustment as Setup>. This applies all the currently selected adjustments to the Presettings tab. These settings will be set to default for future fittings.

Fitting Setup: Keyboard tab

A software interrupter is incorporated into the ACAM System. Settings in the Keyboard tab can be adjusted in this screen to determine which keys will result in specific software interrupter functions (Figure 163). 

Figure 163: Fitting setup Keyboard tab configuration

Select between three loudspeaker and channel options:        

Three different keys enable the signal interrupter function:

Fitting Setup: CD-ROM tab

The ACAM System has the capabilities to play audio CDs.

A series of common audio CDs are integrated in the ACAM System database. Control files are provided for some of the audio CDs integrated into the system, allowing for single word playback. To play a CD in the ACAM System, insert the CD into the CD-ROM drive before opening the ACAM System software.

Under the Fitting setup CD-ROM tab minimal settings need to be configured in order for CD playback to function (Figure 164).

Figure 164: Fitting setup CD-ROM tab configuration

For a detailed description of the CD-ROM implementation, please refer to the section: "CD-playback"

Close the window by performing one of the following options: