NTSC and PAL are both different
variants of analog television systems. NTSC is the kind of
analog television system normally used in United States and
Canada and PAL is more in existence in rest of the world. NTSC
stands for national television system NTSC altogether uses 525
scan lines, thereof approx. 485 are visible. The color sub
carrier has a frequency of approx. 3.58 MHz in the case of
analog NTSC. The common NTSC color sub carrier system is also
called "NTSC M" or "NTSC 3.58.The NTSC refresh frequency was
originally exactly 60 Hz in the black and white TVs this was
chosen because it matched the nominal 60 Hz frequency of
alternating current power used in the United States. It was
preferable to match the screen refresh rate to the power source
to avoid wave interference that would produce rolling bars on
the screen. Synchronization of the refresh rate to the power
cycle also helped kinescope cameras record early live television
broadcasts committee. The PAL format is used particularly in
Western Europe, Australia, New Zealand and in some areas of
Asia. PAL uses altogether 625 scan lines, thereof approx. 575
are visible. The color sub carrier has a frequency of approx.
And 4.43 MHz in the case of analog PAL.
If you happen to use a camcorder that is using NTSC format it
can always play on PAL TVs. In order to afford the luxury of
using NTSC DVDs in pal players or pal DVDS in NTSC players all
you need to have is a video converter.
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The video converter changes between
NTSC and pal with ease and during run time only without any
video lag and without any sort of detonation of the quality of
the pictures converted. Normally most camcorders nowadays have
inbuilt video converters and you do not need to make any extra
investment on that. If you are globe trotter and have a penchant
for using camcorders always make sure that you have a camcorder
that can easily change between NTSC and pal as per the standards
existent in that country. The following technicalities takes
place inside a video converter to convert a NTSC data so that is
visible in the PAL TV.
• The frame rate of the data
captured has to be slowed down to 23.976 frames per second (a
slowdown of 4.3%) and henceforth apply a pull down of 3:2.This
process is known as NTSC slowdown and creates the same type of
audio effects as in the case of PAL speed-up.
• The contents of adjacent frames has been interpolated in order
to produce new intermediate frames; this introduces small
distortions whose difference can only be determined by a person
of good perceptional vision.
Query Contributed By : Sridhar Yamsani
Article Contributed By : Pinakjit Kakati
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