Cascadia Digital video recorder Instrukcja Użytkownika Pobierz pdf (Strona 34)

CCTV Glossary

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Sub-carrier (SC). - Also known as SC: 3.58 MHz for NTSC, 4.43 MHz for PAL. These are the

basic signals in all NTSC and PAL sync signals. It is a continuous sine wave, usually generated

and distributed at 2V in amplitude, and having a frequency of 3.579545 MHz (NTSC) and

4.43361875 MHz (PAL). Sub-carrier is usually divided down from a primary crystal running at

14.318180 MHz, for example, in NTSC, and that divided by 4 is 3.579545. Similar with PAL. All

other synchronizing signals are directly divided down from sub-carrier.

S-VHS. - Super VHS format in video recording. A newer standard proposed by JVC, preserving the

downwards compatibility with the VHS format. It offers much better horizontal resolution up to 400

TV lines. This is mainly due to the color separation techniques, high-quality video heads and better

tapes. S-VHS is usually associated with Y/C separated signals.

Sync. - Short for synchronization pulse.

Sync generator (sync pulse generator, SPG). - Device that generates synchronizing pulses

needed by video source equipment to provide proper equipment video signal timing. Pulses

typically produced by a sync generator could be sub-carrier, burst flag, sync, blanking, H and V

drives and color black. Most commonly used in CCTV are H and V drives.

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