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Question about SECAM and Subcarriers

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

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