Thread View: uk.tech.digital-tv
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11 total messages
Started by Green Xenon [Radium]
Sun, 30 Sep 2007 01:37
Re: Using an FM-Carrier for the Y [Luminance] Signal -- how to relieve the bandwidth issue?
Author: Green Xenon [Radium]
Date: Sun, 30 Sep 2007 01:37
Date: Sun, 30 Sep 2007 01:37
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On Sep 29, 5:20 pm, "Richard Crowley" <rcrow...@xp7rt.net> wrote in http://groups.google.com/group/uk.tech.digital-tv/msg/88f1401cb2a43810 : > "Green Xenon [Radium]" wrote ... > > Anyways, my next question. Is it possible to split the symbol of a 1 > > baud, 8-bit-per-symbol signal > > into 8 bits? I.e. in this case, a single > > symbol would be split into 8 different > > parts each carrying one of the > > bits. Is this possible? If so, would > > this be of any assistance to me? > Sure it is possible. It won't be of any assistance to you (or to > anyone else since you can't put 8 pounds in a 1-pound sack. > Bandwidth is bandwidth, no matter how you slice it. Do you > really think that nobody has thought of various methods of > transmitting video over low-bandwidth paths? If so, you need > to study not only science and engineering but the HISTORY > of science and engineering. There are 8-bits-per-symbol, only 1 baud. The symbol is split into 8 parts. Each part is 1-bit. How is this �putting 8 pounds in a 1-pound sack?� It�s more like �putting 1 pound in a 1-pound sack�
Re: Using an FM-Carrier for the Y [Luminance] Signal -- how to relieve the bandwidth issue?
Author: Dave Platt
Date: Sun, 30 Sep 2007 03:59
Date: Sun, 30 Sep 2007 03:59
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In article <46fefb70$0$7493$4c368faf@roadrunner.com>,
Green Xenon [Radium] <glucegen1@excite.com> wrote:
> > Sure it is possible. It won't be of any assistance to you (or to
> > anyone else since you can't put 8 pounds in a 1-pound sack.
> > Bandwidth is bandwidth, no matter how you slice it. Do you
> > really think that nobody has thought of various methods of
> > transmitting video over low-bandwidth paths? If so, you need
> > to study not only science and engineering but the HISTORY
> > of science and engineering.
>
>There are 8-bits-per-symbol, only 1 baud. The symbol is split into 8
>parts. Each part is 1-bit.
>
>How is this �putting 8 pounds in a 1-pound sack?�
>
>It�s more like �putting 1 pound in a 1-pound sack�
You are using the word "split" without defining what you are meaning,
and I think you may be using the word "bit" in two different ways (as
in "a single binary digit's worth of information" and "a part")...
maybe I'm wrong about the latter.
Sure, you can carry 8 bits of information per symbol, at a rate of one
baud. That's an information rate of 8 bits per second, which isn't a
terribly useful amount of information.
What I *think* you are saying is something along the lines of
"If there's no way to carry N bits of information per symbol (where
N is a large number) at a rate of 1 symbol per second, in a
specified bandwidth, over a channel having a certain amount of
dynamic range / signal-to-noise ratio available, then I'd
like to somehow divide each symbol into eight sub-symbols which
each carry N/8 of the information, but which still make up only one
symbol per second. My hope is that these eight sub-symbols could
be easier to transmit, somehow, than a single symbol carrying N
bits, and that I could thus transmit them more easily but without
using any more bandwidth. Can I do that?"
If that's what you're asking, the answer is "no".
Once you hit the theoretical information limit of the communication
channel (which is set by the bandwidth you use and by the amount of
noise on the channel) you can't do any better than that. No matter
how you modulate (changing the baud rate, the amount of information
per symbol, etc.) you can't do better than this.
And, as we've been trying to make clear, your goal is quite far beyond
the theoretical limit. You just can't get there. You're trying to
put all of Lake Erie in a water-glass.
Let it go, Radium.
--
Dave Platt <dplatt@radagast.org> AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!
Re: Using an FM-Carrier for the Y [Luminance] Signal -- how to relieve the bandwidth issue?
Author: Richard Crowley
Date: Mon, 01 Oct 2007 05:39
Date: Mon, 01 Oct 2007 05:39
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"Green Xenon [Radium]" wrote ... > "Richard Crowley" wrote : > > "Green Xenon [Radium]" wrote ... > > > Anyways, my next question. Is it possible to split the symbol of a > > > 1 > > > baud, 8-bit-per-symbol signal > > > into 8 bits? I.e. in this case, a single > > > symbol would be split into 8 different > > > parts each carrying one of the > > > bits. Is this possible? If so, would > > > this be of any assistance to me? > > > Sure it is possible. It won't be of any assistance to you (or to > > anyone else since you can't put 8 pounds in a 1-pound sack. > > Bandwidth is bandwidth, no matter how you slice it. Do you > > really think that nobody has thought of various methods of > > transmitting video over low-bandwidth paths? If so, you need > > to study not only science and engineering but the HISTORY > > of science and engineering. > > There are 8-bits-per-symbol, only 1 baud. The symbol is split into 8 > parts. Each part is 1-bit. > > How is this �putting 8 pounds in a 1-pound sack?� > > It�s more like �putting 1 pound in a 1-pound sack� Which weighs more: one 8-pound sack, or eight 1-pound sacks? Yes, it is a trick question, but you are the master of trick questions.
Re: Using an FM-Carrier for the Y [Luminance] Signal -- how to relieve the bandwidth issue?
Author: Bob Myers
Date: Mon, 01 Oct 2007 18:06
Date: Mon, 01 Oct 2007 18:06
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"Richard Crowley" <rcrowley@xp7rt.net> wrote in message news:13g11vn3e4ksc08@corp.supernews.com... > Which weighs more: one 8-pound sack, or eight 1-pound sacks? > Yes, it is a trick question, but you are the master of trick questions. Or we might ask our boy Radium this one: Which weighs more, a pound of feathers or a pound of gold? ;-) Bob M.
Re: Using an FM-Carrier for the Y [Luminance] Signal -- how to relieve the bandwidth issue?
Author: John Williamson
Date: Mon, 01 Oct 2007 21:18
Date: Mon, 01 Oct 2007 21:18
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Bob Myers wrote: > "Richard Crowley" <rcrowley@xp7rt.net> wrote in message > news:13g11vn3e4ksc08@corp.supernews.com... >> Which weighs more: one 8-pound sack, or eight 1-pound sacks? >> Yes, it is a trick question, but you are the master of trick questions. > > Or we might ask our boy Radium this one: > > Which weighs more, a pound of feathers or a pound of > gold? ;-) > > Errm... 1 troy ounce (Gold) = 1.09714 imperial ounces (Feathers) 12 Troy ounces = 1 Troy pound (Gold) 16 ounces = 1 pound (Feathers) 1 (troy) pound Gold = 0.822857 pounds (Imperial) feathers Sorry to be picky...;-) -- Tciao for Now! John.
Re: Using an FM-Carrier for the Y [Luminance] Signal -- how to relieve the bandwidth issue?
Author: Don Bowey
Date: Mon, 01 Oct 2007 21:31
Date: Mon, 01 Oct 2007 21:31
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On 10/1/07 2:18 PM, in article fdrnc7$mi8$1@stable.tornevall.net, "John Williamson" <johnwilliamson@btinternet.com> wrote: > Bob Myers wrote: >> "Richard Crowley" <rcrowley@xp7rt.net> wrote in message >> news:13g11vn3e4ksc08@corp.supernews.com... >>> Which weighs more: one 8-pound sack, or eight 1-pound sacks? >>> Yes, it is a trick question, but you are the master of trick questions. >> >> Or we might ask our boy Radium this one: >> >> Which weighs more, a pound of feathers or a pound of >> gold? ;-) >> >> > Errm... Errm? Clearing your throat? > 1 troy ounce (Gold) = 1.09714 imperial ounces (Feathers) > 12 Troy ounces = 1 Troy pound (Gold) > 16 ounces = 1 pound (Feathers) > > 1 (troy) pound Gold = 0.822857 pounds (Imperial) feathers > > Sorry to be picky...;-) To be picky......... I'm sure it was assumed that both the feathers and gold would be measured with the same scale.
Re: Using an FM-Carrier for the Y [Luminance] Signal -- how to relieve the bandwidth issue?
Author: Bob Myers
Date: Tue, 02 Oct 2007 01:03
Date: Tue, 02 Oct 2007 01:03
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"John Williamson" <johnwilliamson@btinternet.com> wrote in message news:fdrnc7$mi8$1@stable.tornevall.net... > Bob Myers wrote: >> "Richard Crowley" <rcrowley@xp7rt.net> wrote in message >> news:13g11vn3e4ksc08@corp.supernews.com... >>> Which weighs more: one 8-pound sack, or eight 1-pound sacks? >>> Yes, it is a trick question, but you are the master of trick questions. >> >> Or we might ask our boy Radium this one: >> >> Which weighs more, a pound of feathers or a pound of >> gold? ;-) >> >> > Errm... > 1 troy ounce (Gold) = 1.09714 imperial ounces (Feathers) > 12 Troy ounces = 1 Troy pound (Gold) > 16 ounces = 1 pound (Feathers) > > 1 (troy) pound Gold = 0.822857 pounds (Imperial) feathers > > Sorry to be picky...;-) > Oh, fine - just GIVE the answer away! Why, pray tell, did you THINK I was suggesting this question be asked of our dear friend Radium? Didn't occur to you that there might actually be a reason I chose those two particular materials? Bob M.
Re: Using an FM-Carrier for the Y [Luminance] Signal -- how torelieve the bandwidth issue?
Author: Bob Myers
Date: Tue, 02 Oct 2007 01:05
Date: Tue, 02 Oct 2007 01:05
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"Don Bowey" <dbowey@comcast.net> wrote in message news:C326B53C.791C0%dbowey@comcast.net... > To be picky......... I'm sure it was assumed that both the feathers and > gold > would be measured with the same scale. Sorry, Don - bad assumption, which was the whole point of the "trick question." But John W. just HAD to go and spoil the fun before we could possibly see Radium jump in....sigh... Bob M.
Re: Using an FM-Carrier for the Y [Luminance] Signal -- how torelieve the bandwidth issue?
Author: Don Bowey
Date: Tue, 02 Oct 2007 01:32
Date: Tue, 02 Oct 2007 01:32
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On 10/1/07 6:05 PM, in article fds5gg$lah$1@usenet01.boi.hp.com, "Bob Myers" <nospamplease@address.invalid> wrote: > > "Don Bowey" <dbowey@comcast.net> wrote in message > news:C326B53C.791C0%dbowey@comcast.net... >> To be picky......... I'm sure it was assumed that both the feathers and >> gold >> would be measured with the same scale. > > Sorry, Don - bad assumption, which was the whole point of > the "trick question." But John W. just HAD to go and spoil > the fun before we could possibly see Radium jump in....sigh... > > Bob M. > > Well, Radium sets hooks far better that he takes one. I suspect he has no interest in other's questions.
Re: Using an FM-Carrier for the Y [Luminance] Signal -- how to relieve the bandwidth issue?
Author: Michael A. Terrell
Date: Tue, 02 Oct 2007 04:29
Date: Tue, 02 Oct 2007 04:29
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Bob Myers wrote: > > "John Williamson" <johnwilliamson@btinternet.com> wrote in message > news:fdrnc7$mi8$1@stable.tornevall.net... > > Bob Myers wrote: > >> "Richard Crowley" <rcrowley@xp7rt.net> wrote in message > >> news:13g11vn3e4ksc08@corp.supernews.com... > >>> Which weighs more: one 8-pound sack, or eight 1-pound sacks? > >>> Yes, it is a trick question, but you are the master of trick questions. > >> > >> Or we might ask our boy Radium this one: > >> > >> Which weighs more, a pound of feathers or a pound of > >> gold? ;-) > >> > >> > > Errm... > > 1 troy ounce (Gold) = 1.09714 imperial ounces (Feathers) > > 12 Troy ounces = 1 Troy pound (Gold) > > 16 ounces = 1 pound (Feathers) > > > > 1 (troy) pound Gold = 0.822857 pounds (Imperial) feathers > > > > Sorry to be picky...;-) > > > > Oh, fine - just GIVE the answer away! > > Why, pray tell, did you THINK I was suggesting this > question be asked of our dear friend Radium? Didn't > occur to you that there might actually be a reason I > chose those two particular materials? > > Bob M. No, other than he's a gold bricking bird brain. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida
Re: Using an FM-Carrier for the Y [Luminance] Signal -- how to relieve the bandwidth issue?
Author: Halmyre
Date: Tue, 02 Oct 2007 07:30
Date: Tue, 02 Oct 2007 07:30
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In article <fdrnc7$mi8$1@stable.tornevall.net>, johnwilliamson@btinternet.com says... > Bob Myers wrote: > > "Richard Crowley" <rcrowley@xp7rt.net> wrote in message > > news:13g11vn3e4ksc08@corp.supernews.com... > >> Which weighs more: one 8-pound sack, or eight 1-pound sacks? > >> Yes, it is a trick question, but you are the master of trick questions. > > > > Or we might ask our boy Radium this one: > > > > Which weighs more, a pound of feathers or a pound of > > gold? ;-) > > > > > Errm... > 1 troy ounce (Gold) = 1.09714 imperial ounces (Feathers) > 12 Troy ounces = 1 Troy pound (Gold) > 16 ounces = 1 pound (Feathers) > > 1 (troy) pound Gold = 0.822857 pounds (Imperial) feathers > > Sorry to be picky...;-) > > There's a bit in one of Richard Feynmann's books where he's talking about borrowing the US's silver reserves to make generator windings for the Manhattan Project during WW2. The Treasury agreed to the request, but took offence for being asked for several tons of silver, pointing out that "we actually measure silver in ounces"... -- Halmyre
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