15 Dec
2011
15 Dec
'11
3:11 p.m.
On 2011 Dec 15, at 11:07 AM, Fred Cisin wrote:
On Thu, 15 Dec 2011, Christian Corti wrote:
There seems to be some confusion/debate about what the "NTSC
standard" defines. I've seen it asserted by others/elsewhere that the
"NTSC standard" refers to only the colour-encoding or colour-encoded
video signal, and does not refer to the (earlier) B&W-only signal. I
always understood it to include the latter and predate the colour spec.
There are 4 'standards' being discussed/specified:
1. the baseband B&W video signal (encoding of sync timing and luminance)
2. how to modulate an RF carrier with that video signal (mod type,
channel width, audio mod and carrier, etc.)
3. the addition of colour information to (1)
4. the broadcast channel frequencies on which to transmit (2)
My understanding is the NTSC agreed upon and specified (1) & (2) in
1940.
The FCC accepted this for (US) national broadcast TV.
The FCC dictated (4), albeit with some lobbying and influences.
The NTSC specified (3) in 1953 and the FCC accepted this also.
RS-170 also figures in this, but I understand RS-170 came quite a bit
later and really just takes (1) and adds the specification of voltage
levels, for the interconnection of equipment using that type of
signal (baseband, no RF). Without looking it up, I think the NTSC
standard only specified relative levels in (1) as it was only
concerned with broadcast requirements when developed.
Here's one history of the channel frequencies and NTSC standards:
http://www.tech-notes.tv/History&Trivia/Channel%20One/Channel_1.htm
You can cable anything you like. If that will
work is another
question ;-)
BTDT
Seriously, the OP should just a VCR as a
receiver/demodulator and
feed the
(C)VBS signal into an appropriate monitor (some modern flat panel
displays
have an RCA and/or S-Video input; or just use a video monitor, or
better: just buy (or get for free) an old TV).
My recommendation is/was the "Digital Prism" (~$50 7" HDTV that can do
analog, (and has very good CC display)) THAT, and my new Philips
19" are
the first TVs that I have ever owned with working internal tuners - I
ALWAYS used VCRs and/or cable boxes, and in the case of a cable box
with
RF out, followed by a CC converter that included RF in and "composite"
out.
The whole discussion is on the niveau of saying
"I don't need
electricity,
but I want to use my electric toaster. What can I do?".
But, to THIS group, that is just a "challenge"
Howzbout: heat ceramic tiles in a fire, then put them into the
crumb tray?
BTW: NTSC is a colour encoding system and has
nothing to do with TV
channel frequencies.
I conflated NTSC with the entire signal, but did NOT use that to
refer to
the channel/frequency. i.e. "almost-NTSC on USA channel 3"
I was under the [mis]impression that color encoding was but one
part of
the standard. Sorry.