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Acoustic Echo Cancellation (AEC)
A process in which acoustical echo is
removed from a signal. AEC can be used to remove unwanted signals from mic audio
if the unwanted acoustic signal is available separately as an electronic signal.
Adaptive Ambient
This portion of the mixer monitors the varying ambient noise
level in the room and changes the threshold level at which a microphone gates on.
Ambient Level
The manually-set background noise level upon which the XAP 400
bases gating protocols. Used only if the Adaptive Ambient feature isn’t used.
Ambient Noise
The existing room-level noise, such as that caused by ventilation
systems, paper shuffling, and background chatter.
Amplitude Plot
A plot of amplitude (-18 to 18dB) vs. frequency (20Hz to 20kHz)
on a logarithmic scale.
Attack Time
This signal parameter determines how quickly compression is enabled.
It is calibrated in milliseconds.
Attenuation
A reduction of signal amplitude.
Audible Hook Indication
The unit signals when it goes on or off hook with a
series of beeps. This indication can be turned on or off in the Telco Configuration
window and the level can be adjusted.
Audible Ringer Indication
When a call comes in, you can hear it ring if Audible
Ringer Indication is turned on in the Telco Configuration window. The ringer level
can also be adjusted.
Audio Processor
A device that modifies an audio signal in response to certain
requirements.
Audio routing
The process of routing input signals (Mics 1–4, Inputs 5–8, From
Telco, From E-bus, From Processing) to output destinations (Output 1–9, To Telco, To
E-bus, To Processing) in the Matrix screen.
Automatic Gain Control (AGC)
Automatically increases or decreases audio gain
to maintain a consistent audio level.
Automatic Gating
Automatically gates microphones on or off based on input levels
and other parameters programmed into the XAP 400.
Automatic Level Control (ALC)
ALC can be selected for the telco input and is
designed to keep soft and loud telephone participants at a consistent level. ALC can
be turned on (default) or off.
Glossary