Preconditioning And Sweep Delay; Smoothing A Curve - Interacoustics Affinity 2.0 Additional Information

Auto Run can be setup in the HIT440 setup (Menu/setup/HIT440 setup).
Next to each test you will f ind a Play symbol (Auto Run)
Click on the Play/Stop symbols f or each test to toggle between Auto and Manual Run.
See more inf ormation about protocol setup in section 0.
3.6.6

Preconditioning and sweep delay

3.6.6.1 Preconditioning
Preconditioning is relevant when using broadband signals such as f or example ISTS/ICRA. It consists of a
wideband signal followed by a pure tone appearing just before the selected stimulus is presented.
The precondition f unction allows you to set a certain time bef ore the curve is shown on screen. This will
allow the hearing aid algorithms to have time to switch on and stabilise in a setting as caused by a non-linear
stimulus. This has two ef f ects – f irst you will avoid the hearing aid being in the process of changing
characteristics during the test, and secondly, the hearing aid will in this case be brought into the mode
corresponding to the stimulus.
3.6.6.2 Sweep delay
The sweep delay is the time bef ore the next sweep will start when running a continuous measurement using
Pure Tone or Warble Tone. Modern hearing aids of ten have advanced algorithms that need a certain
reaction time. It is theref ore helpf ul to be able to set individual delays.
3.6.7

Smoothing a curve

Smoothing is a technique where small details in the curve appear to be ironed out. As these details
sometimes have a noisy character, smoothing may be pref erred. The individual tests can be designed to
have smoothing applied in the HIT440 setup (described f or each test in section 0).
Smoothing can also be applied af ter measuring in two ways:
Shif t + up/down arrow keys on the PC keyboard

Shif t + the scrolling wheel on the mouse

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Affinity/Equinox2.0 – Additional Information
or a Stop symbol (Manual Run) .
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