28 May
2010
28 May
'10
6:20 p.m.
Randy Dawson wrote:
Quite a bit of thought went into NTSC, to keep it
compatible and add color. The burst 3.758 MHz is chosen to not fit a harmonic of the line
rate, frame rate, and that was adjusted too, from 60Hz to 59.xxx, xxx, =975 if I recall
but its been a while.
Approximately 59.94 Hz. From monochrome to color, all the video timings
were adjusted by a factor of 1000/1001, to minimize interference between
the chroma and the sound carrier. It seems like it would have been
better to keep the video timing and move the sound carrier up by
1001/1000, but purportedly the FCC didn't like that idea, even though
receivers of the day wouldn't have noticed.
Eric