Selectable functions for the buttons are:
•
Start Control. Can be used to start other equipment on system
•
Fault control. Active if system is monitored and any fault occurs
•
Page area control. Active when paging to selected Paging zone is active.
•
Local Page Control. Any paging done via Local bus will activate the control output during the operation
•
System Page Control. Any paging done via System bus will activate the control output during the operation
•
Page Control. General control that activates if any paging is done. This function is commonly used for Alarm Bell-
mute function; any paging will mute activated Alarm Bells.
•
Amplifier fault control for spare amplifier change-over
4.3.11 Ambient Noise Compensation
Ambient Noise Compensation (ANC) is used to ensure clear and audible paging and background music in spaces, where
background noise level varies. The reason for variation can be for example amount of public (restaurant) or noise caused
by vehicle (Railway Station).
One or several audio inputs can be configured for ambient background noise.
It is recommended to use condenser/electret microphone with suitable polar pattern for this purpose as they have better
sensitivity than dynamic microphone. If weak noise levels are needed to get detected it might be necessary to equip the
microphone with external preamplifier.
Each ANC Group can control one Program Groups output level 0…12dB.
59 | AlphaAnnounce Software Configuration
