SmartSMS User Manual
Soft dB inc.
User Manual
p. 40
1) Measurement of the acoustic response of the room
Start/Stop the averaging of the SPL (Sound Pressure Level) for this
measurement. The microphone must be moved in the zone to obtain
representative results. “Move the microphone in the zone” means to hold
the microphone in your hand and move it from left to right and back and
forth, thereby obtaining a representative spatial averaging of the zone.
When the averaging is done (it will become obvious to you that the noise
spectrum is representative), click on OK. (Note: The averaging can be
stopped at any time by clicking on Stop Average when the measurement
spectrum is quite stable, even if the averaging is not finished).
2) Measurement of the background noise
After the measurement in the previous step is completed, the system will
request a measurement of the background noise in the zone. The same
measurement procedure has to be done, but no identification noise is
generated by the SmartSMS unit. There should be no activity in the room,
and no noise except for standard ventilation and computer noise.
When the background noise measurement has been completed, click on
OK again to return to the Main window.
It is possible to skip the background noise measurement and import a
measurement done with the spectrum analyzer. Click on the "Import BG
Noise" button and select the desired spectrum. The spectrum must be 1/3
octave TXT file exported with the spectrum analyzer.
It is also possible to select a generic "default noise" which is a somewhat
typical noise in open space offices.
Use this function when the background noise measurement is not
representative of the final conditions (machinery noise for example). It is
possible in this case to import a spectrum which is more representative of
the final conditions.
Optional Adjustment Features of the measurement interface:
This button (in the upper part of the interface) allows the level of the noise
generated during the first step of the automatic equalization process to be
increased or reduced, if necessary. To obtain a good measurement, the
equivalent noise level measured in the room must be at least 5 dB over the
background noise, for each frequency band. We suggest that you set the
level to the maximum level at which there is no saturation on the
microphone. If the level is too high, the microphone may be saturated and a
warning signal appears.
