SmartSMS User Manual Soft dB inc.
User Manual p. 65
If there is no security key number in the SmartSMS unit(s), the user automatically has access to the
unit.
6.5.9 Privacy Index Function
This function allows evaluating the privacy index (PI) of a specific installation. The privacy index is
the opposite of the SII (Speech Intelligibility Index). A PI close to 1 indicates a working environment
with the maximum privacy and without distracting noise. On the other hand, a PI close to zero
indicates a working environment without privacy and comfort for the workers.
The following interface allows evaluating the PI
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based on standard data or on measured data for a
specific installation. The SMS unit and SMS loudspeakers are used to measure the transmission
loss on a specific installation. The transmission loss between a source area and a receptor area
can be evaluated for a specific installation without other equipment than the SMS unit and SMS
loudspeakers.
Figure 57: PI (Privacy Index) function interface
The PI interface allows selecting the source speech with the Speech Spectrum selector. The
interface offers the standard speech spectrum. The transmission loss between the source and the
receptor can be one of the standard transmission loss spectrum or a specific transmission loss
spectrum. When the specific set-up is used for the transmission loss, the interface uses the current
.pi file that contains transmission loss measurement (use Open Measurement to select a .pi file).
The .pi file can be created for a specific installation with the function Transmission Loss
Measurement.
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The PI (1-SII) is computed following the standard IEC 60268–16.
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