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Installation ~ LCD Programming
Telco
The telephone interface can be set to automatically answer an incoming call (Auto
Answer On), or allow the call to be handled manually (Auto Answer Off). The
interface can also be set to disconnect upon Loop Drop, Call Progress, Loop Drop +
CP (call progress), or to disconnect manually (Auto Disconnect Off).
Input parameters
There are three main submenus under the inputs menu tree: Input 1–4, Input
A–D/Telco, and Subbus.
Inputs 1–4
The parameter submenus below this level control how an input channel deals with
input audio. All parameters described can be applied to Input 1–4. The 12 mic input
parameters (see Figure 2.14) are gain adjust, mic/line input, mic activation, mute,
phantom power, AGC, high-pass filter, EQ status, chairman mic, adaptive ambient,
echo canceller, and NLP adjust.
Gain Adjust
This adjusts the level for each gated input’s gain (ranging between -20dB and 20dB).
In conjunction with the LCD and the LED bar graph, all gated inputs can be simply
calibrated for the right level on the mix bus. The default setting is 0dB.
Mic/Line Input
Each input defaults as a microphone level input (55, 25dB gain) but can be switched
to a line-level input (0dB).
Mic Activation
Each input defaults to the auto-gate mode, but can be switched to manual mode
(manual gate on, manual gate off, gate override on, gate override off). Auto-Gate is
where a microphone does not gate on until audio is present at the mic. The AP400
decides to gate the microphone on or off based on parameters set elsewhere in the
AP400 (i.e. gate ratio, etc.). Manual On activates a microphone unit until it is
manually deactivated. Manual Off deactivates a microphone until it is manually
activated. In both cases, this can be done via the Control/Status port. Override On
activates a microphone but does not allow it to contribute to mixing parameters,
such as set in NOM, maximum number of microphones, etc. Override Off deactivates
the microphone.
Mute
This parameter mutes the selected mic channel.
Figure 2.14. Mic Inputs 1–4 parameters