Affinity
2.0
Additional Information Page 72
If selecting the PTA (Fletcher) index you can choose the frequencies that should be included in the
calculation. The default setting will be 500, 1000, 2000, and 4000 Hz. In this calculation method all
frequencies are equally weighted and averaged to give the figure.
The PTA index also provides the option to add a certain level to the result using the dropdown list.
This is useful since the PTA is often used to determine the start intensity for speech testing. If you
prefer to start the speech test at for example15 dB above PTA this can be selected in the dropdown
list:
Note: The PTA is calculated for insert phones and headset. However, if values for both are stored no PTA
value is calculated.
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