Bedrock AM100, Operating Manual

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22 Bedrock AM100 operating manual © Bedrock Audio BV, 2021
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• Note that the STI that you will now measure, will characterize all parts of
your transmission path, from playback device up to the microphone of your
Bedrock AM100.
• Tap “Start”
• Wait for 18 seconds while the measurement takes place. Make sure that
signal playback is not interrupted, and that the acoustic environment is sta-
ble and free from impulsive sounds (such as door slams).
Note: the STIPA
pro module uses a longer measurement time of 25s. A measuring time of 18s is
a reasonable minimum, within the range allowed by the standard, to arrive at
accurate results.
• You will see that the STI on your screen stabilizing towards its end value.
• Optionally, you can press “save” ( ) once the measurement is finished to
store the data, to be browsed or downloaded to PC later. A measurement
number is assigned to each saved measurement. This number is displayed
at the bottom left of the screen (preceded by a “#” character), above the
battery indicator.
The steps described above are essentially the entire procedure. If you are new to STIPA
measurements, please consult tutorials and standards to make informed decisions about the
STIPA signal playback level, measuring positions, number of repeated measurements, etc.
The Quick STIPA module also shows some additional measurement information:
• The A-weighted sound pressure level
• The qualification band (a letter between A and U) that is used in some
standards and defined in IEC 60268-16 rev. 4.
• A label (“bad”-”excellent”) that characterizes intelligibility based on the
STI
The arrows in the blue bar on the top of the display can be used to navigate through the
different screens for each module. The Quick STIPA module has three screens: “STI”,
“settings”, and “browse measurements”.
The “settings” screen gives some options to control the appearance of your measurement
results:
• Choose between presentation of the STI in large digits or as a bar plot
• Choose whether or not you want to see the qualification bands displayed
The “browse measurements” screen allows you to review earlier (saved) measurements
without having to download your data to a PC first.
• Use the blue buttons at the bottom of the screen to scroll back and forth
through your saved measurements.
• Note that the measurement number displayed above the battery indicator
corresponds to the measurement currently shown on the screen.
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