User`s manual

User’s Manual
108 Glossary
NTSC National Television System Committee. This committee
formulates standards for the American color television
system. NTSC has 525 horizontal scan lines, made up of
two interlaced fields of 262.5 lines, scanned 60 times per
second.
O
Output Anything that is sent out from a computer, alarm, or other
device. Output can also refer to the act of emitting
something. For example, monitors output images, and
amplified speakers output sounds.
P
PAL Phase Alternating Line System. This is a video format used
for television/video in Australia, parts of Europe, and the
Middle East. PAL has 625 horizontal scan lines and 25
frames per second.
Pan Rotating or scanning side-to-side motion by a camera to
view an area horizontally.
Parity An extra bit added to a byte, character, or word to ensure
there is always either an even or odd number of bits,
according to operating system logic. If a bit is lost in a
transmission, the loss is detected by checking the parity.
PC Personal Computer. The computer can be an IBM
Computer or a compatible personal computer.
Playback The output of previously recorded video to a monitor or
screen.
Pre-Alarm A specified amount of video occurring prior to an alarm
event that is saved and stored with the recorded alarm
event. The pre-alarm video enables you to review what
may have occurred before the event that triggered the
alarm condition.