Target Coupler 171
6.2.2 Viewing the Coupler EarSim Screen
The Coupler EarSim screen displays the actual real-ear target prescribed for the
patient. Targets are shown in either real-ear SPL or insertion gain. When SPL is
selected, the patient’s thresholds and uncomfortable levels are also displayed.
Any coupler measurements taken in this screen are converted into simulated
real-ear measurements using the average or measured real-ear unaided response.
To get the most accurate real-ear simulations possible, measure the patient’s
real-ear unaided response (REUR) in one of the real-ear measurement screens.
The measured REUR will be used to convert the coupler measurements into
simulated real-ear measurements. See Section 5.4.1 for instructions on perform-
ing the REUR measurement.
In the SPL display, the patient’s audiometric data (HTL and UCL values) are
displayed in dB SPL along with the target. To get the most accurate HL to SPL
transform of this data (and the most accurate real-ear target), measure the
patient’s RECD in the Audiogram Entry screen. See Section 5.3.6 for instruc-
tions.
When the REUR and RECD are not measured, the FP35 substitutes average data
to calculate the real-ear target and coupler measurement conversions. These
averages are sensitive to the selected age of the patient.
See Figure 6.2.2 for the following explanation of the Coupler EarSim screen
with the SPL display:
1. Type of display. This will be either dB SPL or dB I.G. (insertion gain).
2. U = uncomfortable levels, X = thresholds (right ear uses O),
*
= coupler
target
3. Coupler measurement curves converted into simulated real-ear
4. Type of aid and the age of the patient.
5. Ear selected.
6. Leveling status of the sound chamber, including the real-ear speaker angle
that the coupler target is duplicating.
7. Unaided—custom(measured) or average.
8. The signal and weighting types used with the selected curve.
9. N.R. = Noise reduction.
10. Status of reference microphone.
11. RMS/HFA data: If a composite signal is selected, the RMS OUT will be dis-
played here. Otherwise, the selected HFA or SPA will be displayed. Press
[MENU] to select HFA/SPA frequencies.
12. Displays the selected fitting rule.
