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Posted by Sal M. Onella on 10/11/06 04:08
"Radium" <glucegen1@excite.com> wrote in message
news:1160431017.628911.56120@b28g2000cwb.googlegroups.com...
> Hi:
>
> What is the color sub carrier frequency in SECAM video?
>
> http://www.high-techproductions.com/pal,ntsc.htm
>
> The above site shows the color sub carrier frequency for NTSC [3.579545
> MHz] and PAL [4.433618 MHz].
>
> Of the video frequencies described [horizontal frequency, vertical
> frequency, color subcarrier frequency], the color subcarrier is the
> highest? Why is this? How would the picture quality look like if the
> color sub carrier frequency was only 1 hz?
>
>
> Thanks,
>
> Radium
>
Simple: A color tint of the entire screen in one color. The horizontal and
vertical frequencies determine how fast the picture is "drawn" on the
screen. This "drawing" takes place in the manner of a dot-matrix printer
laying down lines on a sheet of paper-- line-by-line-by-line. Normally, the
TV signal's color information changes as rapidly as from one letter to the
next on the printed page, i.e. many color changes per line, so it must occur
faster than the scanning..
If you were to restrict the color to 1Hz, it could not change rapidly, akin
to a whole printed page being limited to containing just a single letter.
No way to write the Great American Novel that way.
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