orthogonal multiplex
A method of combining two or more digital signals that have mutually independent pulses, thus avoiding intersymbol interference.
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orthogonal sampling
In digital video, a sampling where the luminance and the color-difference samples are generated from pixels arranged in common, continuous vertical and horizontal lines on a rectilinear grid that remains constant field/frame to field/frame. [After SMPTE]
orthomode transducer
A device forming part of an antenna feed and serving to combine or separate orthogonally polarized signals.
OS
Operating System
OSA
1. open service architecture,
2. open service access,
3. operator service agreements,
4. open system adapter.
oscillator
An electronic circuit designed to produce an ideally stable alternating voltage or current.
OSD
On-Screen Display
OSI
Abbreviation for Open Systems Interconnection.
OSI–RM
Abbreviation for Open Systems Interconnection--Reference Model.
OSP
1. Old Service Provider.
2. Outside plant (OSP).
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