Using the FONIX 7000 to Verify Coupler and Real-Ear Performance ...

Real Ear Measurements 41
16. Use [F2] to select another envelope. Repeat steps 13 and 14 above.
17. Compare the unaided and aided envelopes and point out the Speech
Intelligibility Index (SII) values to the patient. In this case, the unaided SII (E1)
was 30 and the aided SII (E2) was 59, or an improvement of 29%. These values
represent the percentage of the speech signal that is audible to the user and
often convey more meaning to patients and their family members than a
frequency response curve or a decibel value.
Figure 54 – Visible Speech aided response
Note…Visible speech is a test measurement that should be experimented with in the clinic.
Each clinician will find different display settings and demonstrations that he or she will find most
useful. For example, one may demonstrate the improved SII that results from turning up the
volume control or may demonstrate the decrease in the SII that results from the spouse or
family member turning their back to the patient when they are speaking.