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Glossary ~ A–D
61
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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 Mode
An automixing function that dynamically changes the
ambient noise reference level based on a moving average of the actual noise floor of
the room as picked up by the microphones.
Ambient Level
The sound pressure level (SPL) of a room when no one is speaking
and no external audio is present. Also known as noise floor.
Ambient Noise
The existing room-level noise, such as that caused by ventilation
systems, paper shuffling, and background chatter.
Attenuation
A reduction of signal amplitude.
Automatic Gain Control (AGC)
Automatically increases or decreases audio gain
to maintain a consistent audio level.
Automatic Microphone Mixer
A microphone mixer that automatically activates
and deactivates microphone channels. This serves to increase intelligibility of the
audio by reducing reverberation and noise picked up by the microphones.
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.
Chairman Override
Provides gating priority for all microphones selected for the
chairman override group. When a mic in this group gates on, all microphones not
included in this group gate off.
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.
Decay Rate
The rate at which an automatic mixer attenuates a microphone
channel’s audio level.
Digital Hybrid
A telephone hybrid that uses digital signal processing to provide
excellent audio separation between the send and receive audio paths.
Digital Signal Processor (DSP)
A high speed digital numeric processor that can
rapidly calculate complex mathematical equations. The DSP is the most important
component used in ClearOne digital products.
Glossary