Totally totally incorrect. And PMA was absolutely incorrect in that post of his.
sigh, I have detailed the math quite clearly, your questions say you don't understand..
Please understand what a trig identity actually is, and how is applies.
jn
Sorry John, but I do not see any digital brickwall filter before the sampler, mentioned anti alias filter is analog.
You may want to skim over ADI's Practical-filter-design-precision-ADCs.pdf, seems to make more sense to me.
Nope.
Once saw an article in a low-end microwave engineering trade rag, where a Chinese PhD EE professor claimed that he had demonstrated superluminal data transmission to be used for space communications. He has an experiment set up with misaligned directional antennas between transmitter and receiver so that phase velocity between the two would be faster than light! The equation for phase velocity doesn't say anything about it can't be used to carry information, so he used the math (which he understood and thought he know how to apply).
The misunderstanding is this case is different of course, but there are some parallels between the above story and your confused claims and arguments. If you really understood what you are talking about, you could explain it much better than you have.
After all, in all the times that you thought you might be onto something at work, some interdisciplinary gap between the experts there that you could use your intuition and practical thinking to solve, there must have been times when you tried but it turned out your idea didn't work out. Can't believe you are right each and every time you get an idea at work. You can't be right here every time either, and this is one of those times whether you see why or not.
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JN, I believe you are good in magnetics and also in coil winding. However I know you are not good in signal theory and analysis. You have proven it more than you probably wanted in the last week discussion. I second to syn08 in what he wrote to your address in this theme.
While it may make more sense to you, it is not the only way to skin the cat.
Anti-Aliasing Filter, Group Delay, and Phase Match — Crystal Instruments - Leading Innovation in Vibration Testing, Condition Monitoring, and Data Acquisition
Personally, instead of trying for a 6th order analog, I'd get a digital brickwall capable of a few hundred k rate for the anti-alias.
But lo and behold, the type of anti alias is absolutely immaterial to the discussion of elimination of sideband information.
jn
However much you want to ignore the frequency domain, you can't. Both frequency and time domains have to be used to see what's really happening.
Actually, when I discuss concepts at work, it is face to face. The interpersonal reactions are a big part of discussion, sadly lacking on forum.
When I point out something or ask a specific question, the deer in the headlight look is just classic. But it's never a problem, the scientists, physicists, and engineers never manipulate data or presentation to try and confuse or divert as is done in this thread.
It has been almost 27 years now, eventually perhaps that may happen, but it has yet to. (knock on wood)
Batting 1000 so far. But the day is young..😉
Lets see. So far proof that I am incorrect has come in the form of : waveforms which are different by visual inspection but yet proof that nothing has changed...a waveform picture used to prove a thousand year old trigonometric identity is incorrect..oh, and..."you can't be right every time", such a sad statement to make as proof somebody is incorrect...
I have no problem being wrong. Should anyone here provide actual proof, that'd be awesome.
Diversionary tactics will always fail to convince me.
jn
Suppressed carrier, but using the term modulation is confusing some. It's not intermodulation.
What a diversion...who said that?
Certainly not me. I merely pointed out two waveforms that were different in the time domain, and nobody felt it necessary to look, instead they said there was no difference...sleight of hand.
jn
Yes. Subtle non-linearities are invisible in time domain and dynamic parameters are difficult to decipher from frequency spectrum.
For one it's an identity, adding 20k and 21k creates no new frequencies. Think of doing a problem in complex math and simply throwing away the imaginary part to get the answer.
Not sure what you mean. Here it is with pretty pictures and even the same trig identity. Double-sideband suppressed-carrier transmission - Wikipedia
suppressed carrier modulation
radio an amplitude-modulated wave in which only the sidebands are transmitted, the carrier being removed.
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-RNM
radio an amplitude-modulated wave in which only the sidebands are transmitted, the carrier being removed.
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-RNM
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