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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 800
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.
Audio Processor
A device that modifies an audio signal in response to certain
requirements.
Audio routing
The process of routing input signals (Mics 1–8, Inputs 9-12, From
E-bus, From Processing) to output destinations (Output 1–12, 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 800.
Auxiliary audio
Audio that comes from line level audio sources such as video
codecs, TH2s, and CD players.
Bandwidth
The difference between the lower and upper 3dB end points of an audio
band. Also, the range or differences between the limiting frequencies of a continuous
frequency band.
Baud Rate
The number of signal transitions per second, or the clock rate of the
serial bit stream in hertz. Given 7 or 8 bits for data plus start and stop, the
approximate ASCII character transmission rate is one-tenth the baud rate.
Glossary