•
The masking criteria are configurable so that you can
set them up to match your local recommendations for
masking. You can for instance choose either frequency
specific criteria, which increases the efficacy of your
work, or the traditional "one-level-fits-all" criteria.
Select the
Tools
>
Configuration Wizard
>
Audi-
ometry
-
Configure
... >
Masking Assistant
to set up
the masking criteria.
All masking signals are calibrated in effective masking.
How does the Masking Assistant work?
Terminology
AC
AC test ear
ACc
AC contra
BC
BC
BCc
BC contra
Min IA
Minimum inter-aural attenuation.
When is masking required?
Masking is recommended when the following conditions are met:
AC
AC > ACc + Min IA or AC > BCc + Min IA
BC
BC < AC - x* dB
Only stored thresholds measured without masking are checked. Levels which did not evoke a response are excluded from
the check. This means that as soon as a masked threshold has been stored, the flashing stops for that frequency.
* denotes configurable Air/Bone gap criterion (
Tools
>
Configuration Wizard
>
Audiometry
-
Configure
... >
Masking
Assistant
).
Min IA is frequency specific
These are the Min IA tables for TDH-39 and Natus Inserts used in the Masking Assistant
1
.
1Katz, J., Lezynski, J. (2002). Clinical Masking. In J. Katz, ed.,
Handbook of Clinical Audiology
, Williams and Wilkins, Bal-
timore. Munro, K.J., Agnew,
N. A comparison of inter-aural attenuation with the Etymotic ER-3A insert earphone and
the Telephonics TDH-39 supra-aural earphone
. Br J Audiol 1999; 33: 259-262. Hall, JW., MUELLER, HG. (1997).
The audi-
ologists’ desk reference
, Volume I., Singular Publishing Group, San Diego.
16
Madsen A450
2 Navigating in the Otosuite Audiometry module
