Calrec BRIO 36, User Manual

Page: 188 / 210

188 BRIO 36
Audio Production System with Optional Networking
EXTERNAL INTERFACING
MIC OPEN SYSTEMS AND ON AIR PROTECTION CONFIGURATION
Mic Open systems are used to control external devices, relative to the ‘On Air’ status of a signal source. Mic open
systems can CUT or DIM a loud speaker feed to avoid feedback, or control relays for switching purposes, such as
turning on ON AIR lights. This On Air Protection is an important part of the Broadcast System.
There are 5 Mic Open systems available on the console, each is normally associated with a physical area for control,
such as a studio or an area of a studio floor. Mic Open systems work for all input ports, as microphones can be
connected to ports other than mic/line inputs.
Mic Open systems detect whether the assigned signal sources are on air.
A signal is deemed to be on air if:
•
It is assigned to a channel input (one or two).
• The channel is selected to that input (one or two).
• Its fader is open and not cut.
• It is routed to a main output.
• That main output’s fader is open.
• If a signal is routed via a group or a number of groups in series before being routed to a main output, those group
faders must also be open and not cut.
Note: the fader open trigger happens at -90dB and the fader close trigger happens at -95dB.
If a signal is routed to a console input via a hydra patchbay and/or an input alias the on air decoding will be the same as
described above.
When a Mic Open system detects that a microphone is on air, it switches on and the associated GPO/CUT/DIM is
executed.
Mic Open systems are console-wide.
FIGURE 1- ASSIGNING A MIC OPEN SYSTEM