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Glossary ~ E–S
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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.
Equalization
The enhancement of audio which can include high, low and band pass
filtering. Equalization is used to filter out hum, noise, and other unwanted audio. Is
also used to tailor the sound for the best intelligibility and ease of listening.
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.
Gentner Distributed Echo Cancellation
ClearOne’s proprietary system for
applying echo cancellation individually to each mic input.
Hold Time
The amount of time an automixer waits after a microphone channel has
no stimulus before beginning the off attenuation process.
Integrated Dialing
The ability of a telephone hybrid to dial (generate touch tones)
via an RS-232 serial connection.
Matrix Mixer
A mixer that allows routing of any input or combination of inputs to
an output or any combination of outputs.
Number of open microphones (NOM)
An automixing function that establishes a
constant microphone gain in the room. As more microphones are activated, each
microphone’s gain is reduced and vice versa.
Omni-directional Microphone
A microphone that picks up audio in a 360-degree
pattern.
PA Adaptive Mode
An automixing function exclusive to ClearOne products that
keeps microphone channels from activating when distant or other audio sources are
amplified through a loudspeaker in a room.
Reverberation
Audio in a room that bounces off a wall, ceiling, table or other
objects and then is picked up by microphone. High reverberation causes listener
fatigue and makes audio difficult to understand.
Simultaneous Two Wire/Four Wire
The ability of a teleconferencing device to
connect to a video codec and a telephone line simultaneously.
Sound Pressure Level (SPL)
The measure of acoustical audio in the air. Is
measured in dB using an SPL meter.