ASL INTERCOM VAR8 - Page 94

VAR8 and Variants Operation, Commissioning, Fault Finding, and Maintenance Guide
sue: 02 complete, approved
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Is
Page 94 of 166
Figure 9 ANS Operation Example
AMBIENT NOISE
LEVEL
Min
ANS=+70dBA
Max
ANS=+90dBA
ANNOUNCEMENT
IN PROGRESS
T
MAX CONTROL RANGE
(+20dB)
B
A A
AREA
AMBIENT NOISE BELOW MIN ANS THRESHOLD,
THEREFORE MINiMUM GAIN IS USED.
AREA
AMBIENT NOISE ABOVE MAX ANS THRESHOLD,
THEREFORE MAXIMUM GAIN IS USED.
A
B
PA
SYSTEM GAIN
0dB
-25dB
ANNOUNCEMENT
IN PROGRESS
(FROZEN ANS LEVEL)
MAX CONTROL RANGE
(+20dB)
T
-5dB
OUTPUT GAIN SETTING:
MAXIMUM GAIN (WITHOUT ANS) =-5 dB
ANS SETTINGS:
MIN ANS THRESHOLD = +70 dBA
MAX ANS THRESHOLD = +90 dBA