6
AVAILABLE ACCESSORY PRODUCTS TO MEASURE INTELLIGIBILITY AND
PRIVACY
Gold Line offers a portable sound source, the Gold Line TalkBox™ to provide a source for the
STI-PA tones. The system includes a portable CD player that has been modified for
measurement quality performance, an internal amplifier and a small positionable loudspeaker.
The TalkBox™ system is contained in a lightweight carry case and will run on AC Power or
internal batteries. The Talkbox can be used for direct input of the test signal or for playing the
signal through the loudspeaker simulating a person talking into a microphone.
Privacy Index
is essentially the inverse of the intelligibility Index. One can think of it as an
Un-Intelligibility
Index. Whereas Gold Line’s intelligibility firmware tells you when people are
able to understand speech from a sound system, OPT PI (Privacy Index) does the opposite. It
tells you when speech is sufficiently blocked or masked so that people cannot understand the
content. By doing so it predicts when various degrees of privacy have been achieved.
Model DSP2B
is a dedicated meter to measure Speech Intelligibility using
OPT STICis
intelligibility software option.
Model DSP2BP
includes
OPT STICis
intelligibility software
module and the
OPT PI
firmware option to measure Privacy. In order to accept the OPT PI
firmware, a meter must have the intelligibility software, OPT STICis, since the two packages
share code.
Other Goldline analyzers that accept the OPT PI and OPT STIC options are the DSP 2, DSP30 &
DSPCIW.
UTILITY TO ADD NOISE
Both the DSP2B/BP and the DSP30B/BP have a utility to allow you to correct an STI score
measured in an empty room, to that which would be obtained with the room occupied. The noise
correction calculation requires three pieces of information:
1. An intelligibility measurement for the room when empty.
2. The spectrum of the ambient noise at the time of the intelligibility test.
3. The spectrum of the noise that the measurement is to be corrected to.
This utility permits systems to be tested prior to final occupancy to determine possible problem
locations or conditions.
