| Glossary Terms
- Decoder - (1) A device used to separate the RGBS (red, green,
blue and sync) signals from a composite video signal. Also called an NTSC decoder.
(2) The device in a synchronizer or programmer which reads the encoded signal and
turns it into some form of control.
- Y/C separator - A Y/C separator takes a composite video signal and pulls
the luma and chroma apart. This is the first thing that a color TV must do so that
the chroma can then be decoded further.
- Encoder - A device, often built into video cameras, that changes individual
component signals into composite signals. For example, an encoder combines Y (luma)
and C (chroma) signals to produce a video image.
- Sync - Synchronization. In video, sync is a means of controlling when things
happen with respect to other things. This is accomplished with timing pulses to insure
that each step in a process occurs at exactly the right time. For example, horizontal
sync determines exactly when to begin each horizontal line (sweep) of the electron
beam. Vertical sync determines when to bring the electron beam to the top left of the
screen to start a new field. There are many other types of sync in a video system. (Also
called "sync signal" or "sync pulse".)
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