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100 Speech Intelligibility
Conducting a STI-PA test (overview of steps)
Models SE and DL
Conducting a STI-PA test (overview of steps)
1. Calibrate the SoundPro.
2. Set-up your STI-PA options via the” Measures” setup screen. (Select the measurement type
as STI-PA.)
3. A level setup is conducted. From a fixed-point, the technician measures the A-weighted SPL
of MNS message (or alarm system). The test signal volume should approximately match the
MNS message volume. (You would adjust the test signal to match the L
AS
value.)
4. The test signal is played through buildings voice system (PA system).
5. The technician/sound tester positions himself/herself in “zones”/building areas.
•
It is recommended to design a map of “zones”(or rooms) to indicate where you will be
taking your measurements.
•
Set measuring range appropriately.
6. STI-PA measurement is conducted. Press the Run/Pause key to start the study.
NOTE: If you want to post-process your intelligibility measurements with previously captured
background noise, you would first capture curves and then apply this during your study.
7. After a 15-second countdown, either a STI or CIS level is displayed with a pass/fail message.
8. The technician/sound tester moves throughout the building and measures in all zones/rooms.
NOTE: A zone/room is typically a room 20x20. More than one measurement may be
required if the room exceeds this size.
9. The tests are noted as pass/fail.
NOTE: the past tests can be reviewed and loaded via the File System screen.
STI-PA setup
The following table explains all of the parameters found in the measures setup
screen.
Measures
setup screen
Explanation
Scale type field
Select either STI scale or CIS scale. (Please refer to Chapter 1, “STI
scale or CIS scale”)
Gender field
The voice can be set according to the test signal being use, male or
female voice. NOTE: the Verifier default
setting is Male. If using the
test signal supplied by
3M, this uses a male test signal; so; you will
not have to change this field if you only use the male test tone signal.