Interacoustics AA222 Additional Information page 41

AA222 Additional Information
H Set the default presentation of channel 1 to Continuous, Single pulse, Multi Pulse.
I Set the default presentation to manual or reverse.
Hearing loss on audiogram
You can enable or disable the Show European CPT-AMA index. When enabled, the European
J
CPT-AMA is then calculated and displayed on the tone test screen. CPT-AMA ensures that the
different frequencies are weighted in order to display a correct quantification of impairment due to the
hearing loss. The weighting and intensity of each frequency are shown below. CPT-AMA is used as
an average, indicating the severity of the hearing loss.
Please refer to Sibylle Bertoli, Katharina Staehelin, Elisabeth Zemp, Christian Schindler,Daniel
Bodmer & Rudolf Probst (2009) Survey on hearing aid use and satisfaction inSwitzerland and their
determinants, International Journal of Audiology, 48:4, 183-195
K When Show PTA (Flexher) index is enabled, a pure tone average is shown in the top of the
audiogram. You can then select the frequencies intended as part of the PTA calculation.
The default setting is 500, 1000, 2000, and 4000 Hz. In this calculation method all frequencies are
weighted equally and averaged to give the figure.
Note: The PTA is calculated for insert phones and head phones. However, if values for both are
stored, the threshold obtained at the best intensity is used.
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