Interacoustics affinity 2.0 Additional Information

Affinity
2.0
Additional Information Page 219
 Start Frequency and Stop Frequency: Select the preferred frequencies using the sliders.
These may for example be set so that they correspond with the hearing aid gain handles (e.g.
if the hearing aid goes up to 8000 Hz there is no reason to measure beyond this frequency).
To avoid low frequency noise you may wish to set the slider to a start frequency of 200Hz.
 Sweep delays: This is relevant if Continuous measurement is selected for Pure Tone or
Warble Tone. In this case sweep delays (in milliseconds) may be entered between the
individual sweeps (see section 0 for details).
 Measurement time (in seconds): Duration for the measurement can be set using the slider.
This is only relevant for broad band signals. A number of seconds can freely be selected
between 1 and 1200. By default the measurement time is the same for all signals.
 Instructions: This allows for adding picture instructions. If the box is ticked an instruction box
explaining how to perform the measurement will appear each time upon pressing START.
3) Recording method:
 Resolution (of frequency): Select the preferred resolution in the dropdown. The higher the
resolution the slower the measurement.
Keep in mind that 1/3 is what is used in many hearing aid manufacturers software. If the curve
is to be compared to this you may consider choosing this resolution. Also note that when using
a broad band signal the dropdown list will be greyed out and automatically choose FFT. This
makes the distance between frequency bins 43 Hz which ensures precision in the
measurement.
4) Colour:
 Select a colour for the Right and Left curve (see section 2.6.2.1 regarding REUR/REUG for
details).
5) Multiple curves:
 The Multiple curves option, if configured, will run a series of concurrent differing intensity
levels when you press start in the test screen. Set the first level using the Input Level slider
and press Add under Multiple Curves. The level will then appear in the corresponding white
section as the Primary intensity. Select the second level and press Add again. The new level
will then be listed under the first one. If a level is selected by mistake click on it in the white
section and press Remove.
6) Display:
 Display Peaks and Valleys: This is relevant when using a broad band signal. When ticking the
check box the REM440 will show the measured maximum and minimum in speech spectrum
over time (5 seconds) on screen. The measurement is independent of the selected
measurement time.
 Hide target: This will remove the fitting target from the screen by default
 Hide MPO: This will remove the MPO when using the DSL mi/o fitting prescription in
Response view.
 1/3 octave and overlapping time window: For speech-like signals, the signal is converted into
an FFT and then sampled. The clock frequency of the Affinity is 44100 Hz and we do 1024
samples per second. This means that the time period for each sample is 23 ms.
 Percentiles for full measurement: activate this box if you want to see the intensity components
in different shaded percentile sections – these are customisable and will show the output as a
shaded range on the graph.
 Show dynamic compression ratio: Enabling this feature will display the dynamic compression
ratios when the 1/3 octave and overlapping time windows option is enabled. Set settings to
IEC 60118-15: use this button in order to set the measurement settings according to the IEC
60118-15 standard
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this will amend the settings mentioned above to meet this configuration
description.
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For detailed information, please refer to the IEC 60118-15 standard.

Interacoustics affinity 2.0 Specifications

General

Brand	Interacoustics
Model	affinity 2.0
Category	Medical Equipment
Language	English