2 Nov
2006
2 Nov
'06
1:49 p.m.
--- Patrick Finnegan <pat at computer-refuge.org> wrote:
So RS-170 has nothing to do with the amplitude of the
signals? Or should I ask to specify something as
RS-170 compatible/compliant.
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Peak-to-peak means the difference between the
maximum and minimum
voltage of the signal. Something that ranges from
+ 5V to +10V
above "ground" would be "5V" P2P, but a 10V peak
signal.
In the case of RS-170 video, it's -0.4V - 1.0V, so
1.4V p-p or 1.0V
peak.
Well that's encouraging. I was thinking in terms of
sine waves and such, which have a peak to peak
voltage, and in that case, half of the cycle is below
ground. I was under the impression that measuring such
a signals "peak" voltage was an rms value, but I guess
I botched that up too :)
The older
broadcast monitors were designated
RS-170
(those with seperate color inputs) I do believe.
Maybe
modern VGA signals and whatnot are also
compatible.
One problem...what do you do with the Intensity
input
(older TTL monitors are not RGB, they're
RGBI).
RS-170 is US baseband video without color. RS-170A
is US baseband video
with color (NTSC). (525-line, 3.579545 MHz
colorburst frequency, 59.94
fields per second, 29.97 frames per second).