[BC] CBS Color...lived on

[Richard Fry]

>The NTSC compatible color system produces about 330 lines
>out of the 525 line scanning standard because of the deci-
>mation of luma frequencies to fit the 3.58 subcarrier...
____________

I forgot to comment on the above statement.   The NTSC standard does not 
limit luminance bandwidth -- it is the same ~4.2 MHz (nominally 330 lines 
of horizontal resolution) as the 525/60 Hz monochrome standard was in the 
first place.  And in both B&W and NTSC, luminance vertical resolution is 
reduced from 525 lines by the number of lines in the vertical interval (as 
it was the CBS color system).  Interlacing also has an affect on this, and 
was common to the NTSC and monochrome standards.

Early (cheap) NTSC receivers would remove the 3.58 MHz subcarrier from 
luminance by simple video filters, and that would reduce the horizontal 
resolution in the luminance channel as seen on the CRT.

But for many years now, an NTSC receiver with good comb filtering can 
remove the 3.58 MHz color subcarrier from luminance video while preserving 
the 4.2 MHz luminance video bandwidth and resolution that always has been 
available in the NTSC transmitted signal.

RF