- ClearOne Communications Installation & Operation Manual Telephone Interface AP10

Glossary
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Matrix mixer A mixer that allows routing of any input or combination of inputs to
an output or any combination of outputs.
Omni-directional Microphone A microphone that picks up audio in a 360-degree
pattern.
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.
Telephone Hybrid A term used to refer to a telephone interface that separates
send and receive audio. Same as a digital hybrid.
Two Wire Typically refers to a telephone line.
Uni-directional Microphone A microphone that picks up audio in a directional
(usually 180 degrees or less) pattern.