ClearOne XAP TH2 - Manual (Page 57)

53 Glossary ~ A–E
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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.
Ambient Noise The existing room-level noise, such as that caused by ventilation
systems, paper shuffling, and background chatter.
ASCII The American Standard Code (for) Information Interchange. Standard code
for transmitting alphanumeric characters electronically.
Attenuation A reduction of signal amplitude.
Audio Processor A device that modifies an audio signal in response to certain
requirements.
Automatic Level Control (ALC) Automatically increases or decreases audio level
to maintain a consistent audio level.
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.
Clipping A condition in which a signal level exceeds the maximum level a circuit
can handle. This is usually caused by overdriving an input. It always causes distortion
and typically leads to listener fatigue and accelerated failure of loudspeaker drivers.
Compression An induced reduction in the dynamic range of part or all of an audio
signal. Compression is usually used to protect individual loudspeaker components
from the damaging effects of transients.
DSP Digital signal processor.
Echo Canceller Reference The signal point which contains an electronic copy of
all signals which will be removed from the signal the mics pick up. This is always the
far-end audio and, optionally, local program material.
Expansion Bus Consists of two RJ-45 connectors on the rear panel of the XAP
TH2. An expansion bus allows multiple XAP TH2s to be networked together using
category five twisted-pair (10BaseT) cable.
Gain The amount a signal is increased over a given reference, typically 0. It is
Glossary