Thread View: uk.tech.digital-tv
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Started by Green Xenon [Radium]
Sat, 29 Sep 2007 23:53
Re: Using an FM-Carrier for the Y [Luminance] Signal -- how to relieve the bandwidth issue?
Author: Green Xenon [Radium]
Date: Sat, 29 Sep 2007 23:53
Date: Sat, 29 Sep 2007 23:53
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On Sep 29, 10:11 am, tonsofpcs <tonsof...@gmail.com> wrote http://groups.google.com/group/uk.tech.digital-tv/msg/5d3083e46aff377a : > The only way I see of you getting something narrow in bandwidth to > transmit video luma would be to take it, and create a digital system > that has a very large number of discrete states, so large that the > lines between them seem to blur, and transmit it at a very high > frequency (or more, maybe even an ultra high frequency), with a large > number of bits per symbol (8 seems like a good number) but a very high > temporal resolution. You could even modulate a color subcarrier on > and add in chroma information on two axis, lets call them I and Q. > This will create a situation where the receiver will be receiving the > data with interference, but since you are only sending a small amount > of data at each temporal interval, any interference's effect within a > decent area will be negligible and the viewer's eye's will compensate. > On second thought, analog video is so much simpler (and exactly the > same, except it lacks discrete levels). > > -- > A confused Eric, wondering why you're trying to do this.... Well, my goal was to somehow receive QM video signal on a frequency-modulated ULF [radio-frequency between 300 and 3,000 KHz] carrier -- in which the QM uses only 1 baud but shoves as many bits-per-symbol mathematically possible while setting the maximum voltage of the discrete states low enough not to cause any harm to anyone or anything [including the equipment itself] -- and with as many discrete states [between the highest and lowest voltage] as mathematically-possible. Unfortunately, reality does not want me doing this and reality always has the last word as to what does and what doesn๏ฟฝt occur. 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?
Re: Using an FM-Carrier for the Y [Luminance] Signal -- how to relieve the bandwidth issue?
Author: Richard Crowley
Date: Sun, 30 Sep 2007 00:20
Date: Sun, 30 Sep 2007 00:20
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"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.
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