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Glossary
Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
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.
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.
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.
Digital Hybrid
A telephone hybrid that uses digital signal processing to provide
excellent audio separation between the send and receive audio paths.
Distributed Echo Cancellation
ClearOne’s proprietary system for applying echo
cancellation individually to each mic input. Used in AP800 and AP400 units.
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.
Echo Cancellation
The process in which acoustic echoes are canceled. This is
accomplished by sampling the distant audio that is amplified through the
loudspeaker in the room. When this audio is picked up by the microphone (this is
acoustic echo), an echo canceller eliminates or “cancels” the echo.
Four Wire
Typically refers to audio in and out of a video codec.
G-Link
A high speed digital network bus used to link AP800, AP400, and AP10
units.
Integrated Dialing
The ability of a telephone hybrid to dial (generate touch tones)
via an RS-232 serial connection.
Glossary