I want to see your head on a pike.
 

On 2007-06-08, Robert Peffers. wrote:

Is there anything to prevent a republic also being democratic?

the collapse of the soviet bloc. :-)

Bye.
Jasen

I want to see SHF FM video signals.
 

"Bob Myers" wrote...
"Richard Crowley" wrote ...
We're all betting on how long it takes you to relize that you've
been trolled.

I've been here - and watching our friend Radium in action -
for quite some time. Don't care, perhaps someone will
learn something from the exchange.

Laudable, but consider also that you are directly
contributing to "Radium"s filling the Google archives
with misleading drivel for future readers to trip over.

I want to see SHF FM video signals.
 

Police use spy tools to spot criminals. www.clarionledger.com
(Local News)

I saw something about that on yesertay's tv news, amazing.Check out
those new fiber optic spy cameras the City of Jackson is putting up all
over town.They need to put one up on each end of the short little street
I live on.
cuhulin

I want to see your head on a pike.
 

Is your CD drive stuck on the one and only track?

"Rich Grise" wrote in message
...
None of this crap belongs in sci.electronics.basics.

On Fri, 08 Jun 2007 06:23:11 -0400, default wrote:

On Thu, 7 Jun 2007 21:57:17 -0400, "labtech_one"
wrote:


"default" wrote in message
. ..

SNIP

In all fairness it is/was our fault. Theoretically (in a democracy)
the people rule. We must really like the idea of war . . . --


in all fairness, the USA is a REPUBLIC, not a democracy. (Majority does
NOT always rule)

A democratic republic - or as the decider is fond of saying a
"democracy."

We are "bringing democracy to Iraq." Hear it over and over.

More like bringing hypocrisy, but they prefer to use "democracy."

I want to see SHF FM video signals.
 

The other thing is that the evolution of TV transmission also had to be
compatible with older sets. Hence for example the various ways of
transmitting chrominance alongside luminance. Or stereo sound alongside
mono.

"Bob Myers" wrote in message
...

"Radium" wrote in message
oups.com...

Why not carry the luminance-signal on FM and the audio-signal on AM?

See the previous post; it's basically a matter of the enormous bandwidth
requirements of FM (note that the standard "deviation" in FM *audio*
broadcast - a measure of how "wide" the overall signal will be - is +/-
75 kHz from the nominal carrier frequency, for a 15 kHz audio bandwidth.
The relationship between the transmitted signal bandwidth and the original
signal bandwidth in FM is not a simple one, but let's just leave it at the
point of noting that video signals are bandwidth hogs, and TV doesn't
even use regular-old-AM as a result of that. (The luminance signal is
actually sent via "vestigal sideband AM," one step removed from full
suppressed-carrier SSB.)

The audio is FM both to avoid the problems of interference bothering the
sound (just as in FM radio), AND to minimize the effects of the
video portions of the signal possibly interfering with the audio. A TV
channel, though, has relatively lots of room for audio.

Nonsense. The choices of AM and FM within the original analog
standard definitions were made for some very, very good reasons.
Digital television is a completely different beast, and is presently
broadcast using two very different modulation schemes - the
U.S. standard (ATSC) using 8-VSB, while the rest of the world
(mostly) will be using COFDM under the DVB-T standard.

Couldn't FSK [the digital equivalent of FM] be used for luminance [Y]
signal of the digital video?

FSK isn't exactly "the digital equivalent of FM" in the first place, and
the short form answer is no. Digital video is carried in a completely
difference manner, and there isn't exactly a readily-separable
luminance "signal" as such in the transmitted signal, at least not as
something you could identify on a scope as in analog TV - it's all just
bits, and it's all packetized.

Bob M.

I want to see SHF FM video signals.
 

My Velocity Micro ProMagix www.velocitymicro.com
www.velocitymicroblog.com desktop computer has a CD drive and a big
floppy disk drive.(I made sure of the floppy disk drive when I paid
$1,330.00 for my computer) I keep my computer lean and mean, I am not
dumb enough to haul my computer around on the internet in newsgroups and
guestbooks and crap.I have a cheap AM/FM so-called radio here that has a
CD drive on the top of it.I bought the thing at the Sears store about
five years ago.
cuhulin

I want to see SHF FM video signals.
 

On Fri, 08 Jun 2007 20:58:04 +0000, Radium wrote:

Why not carry the luminance-signal on FM and the audio-signal on AM?

Because it would be abysmally stupid to try to do so. You'd need about
10 times as much bandwidth if you used FM for the video, and using AM
for the audio would make it susceptible to all manner of noise.

Hope This Helps!
Rich

I want to see SHF FM video signals.
 

On Jun 12, 10:57 am, Rich Grise wrote:
On Fri, 08 Jun 2007 20:58:04 +0000, Radium wrote:
Why not carry the luminance-signal on FM and the audio-signal on AM?

Because it would be abysmally stupid to try to do so. You'd need about
10 times as much bandwidth if you used FM for the video, and using AM
for the audio would make it susceptible to all manner of noise.

Isn't the interference on AM video as much of a concern as it would be
on AM audio?

I want to see SHF FM video signals.
 

"Radium" wrote in message
oups.com...
On Jun 12, 10:57 am, Rich Grise wrote:
On Fri, 08 Jun 2007 20:58:04 +0000, Radium wrote:
Why not carry the luminance-signal on FM and the audio-signal on AM?

Because it would be abysmally stupid to try to do so. You'd need about
10 times as much bandwidth if you used FM for the video, and using AM
for the audio would make it susceptible to all manner of noise.

Isn't the interference on AM video as much of a concern as it would be
on AM audio?

Nope, not really. The creators of the analog TV standard
did something very clever and yet very simple - in choosing
VSB-AM for the video modulation, they also set it up with
"negative modulation," meaning that the peaks of the
modulated signal correspond to the "blackest" portions of
the video (luminance) waveform - which happen to be the
sync pulses. This means that, in the presence of noise, you
are still very likely to maintain a stable picture; the picture
itself may degrade and get a bit "snowy," but you can still
see it. And it really takes quite a bit of noise to make visible
"snow" show up in the picture. For one thing, video has tons
of redundancy due to the repeated raster-refresh scanning,
so you're very unlikely to see the occasional noise spike.
But also, due to this choice re the modulation, low-level
noise is most likely to show up affecting the brighter parts
of the image, where it is a good deal more difficult to see.
VSB-AM was really the ONLY practical choice for analog
video in the broadcast world. And, as has already been noted,
the situation re the modulation schemes used with "digital"
television are considerably different/more complicated.

Bob M.

I want to see SHF FM video signals.
 

Them CD thangys don't last long.If you paid as much as $20.00 for one,
you paid $20.00 too much.
cuhulin