Working With Fitting Targets; Calculating The Target; Choosing A Fitting Prescription - Interacoustics Affinity 2.0 Additional Information

2.0
Affinity Additional Information
Note: If you have done Calibrate for open fit, only the signals used for this calibration are available in the
stimulus selection dropdown for aided measures (e.g. REIG, REAR)
2.6.7

Working with Fitting Targets

The REM440 includes many possibilities ensuring a precise target calculation based on the data available on
the individual client.

2.6.7.1 Calculating the Target

To show a target in the REM440 screen an audiogram must be present in the AC440/audiogram screen.
This can be obtained in two ways:
4) Enter the AC440/Audiogram screen by clicking the AUD tab to the right and enter the
thresholds manually while in Current Session .
OR
5) If an audiogram has already been saved in Noah, it can be retrieved in the Session List
where all historical audiograms are listed by date.
After selecting/entering an audiogram go to the REM screen.

2.6.7.2 Choosing a Fitting Prescription

Fitting targets can be selected in the Fitting Prescription dropdown list.
A fitting target can be described as a recipe for how to fit the hearing aids. Today, the most commonly used
generic fitting targets for non-linear hearing aids are the DSL m[i/o] developed at the University of Western
Ontario in Canada and the NAL-NL1/NAL-NL2 developed by National Acoustics Laboratories in Australia.
The DSL m[i/o] is often used in paediatric fittings and has been verified on children. However, recent
versions focus on adult fittings as well. The aim of the DSL m[i/o] is to provide the hearing aid user with an
audible and comfortable signal at each frequency region. The knee-point is low allowing the client perceive
many soft sounds. This may be an advantage when using the input for speech development.
NAL-NL1/NAL-NL2 has a higher knee-point and focuses the amplification primarily on speech which is likely
to be the most important reason for the client to acquire hearing aids. It aims to maximize speech intelligibility
while maintaining overall loudness at a level similar to that perceived by a normal-hearing person listening to
the same sound (Dillon 2001).
Note: the selections for each fitting prescription such as Age, Client type and so on differ depending on
which fitting prescription is selected.
Page 165