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Sub: Rigol's DHO800 Oscilloscope (Gibbs Effect & Aliasing Misunderstanding)
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nctnico:

--- Quote from: Mechatrommer on October 29, 2023, 02:19:40 pm ---
--- Quote from: nctnico on October 29, 2023, 02:13:46 pm ---
--- Quote from: Mechatrommer on October 29, 2023, 02:11:35 pm ---
--- Quote from: wasedadoc on October 29, 2023, 01:51:51 pm ---Here is some evidence that Gibbs ears are real and can be seen on the output of a passive analogue filter.

--- End quote ---
yes! i was about to sketch similar picture for Fungus to understand, but since you provided proven one, thanks! i didnt rule out the possibility of it existing... so thats why i asked for evidence. from picture its about 1us delay. mind to tell what filter is that? or if that feasible to put on DSO front end?

--- End quote ---
Again, what wasedadoc is showing are not Gibbs ears!

--- End quote ---
dont be pedantic friend... if someone give your kid an elephant toy and they call it ohh its an elephant! and then you say, its not an elephant, elephant is in jungle, you screw it man.. ;) ok fine! it just looks like Gibbs ear, but not Gibbs ear... or else what proper term for it? ever-increasing-magnitude-apparently-seems-non-causal-ringing? cheers.

--- End quote ---
For the umpteenth time: Gibbs ears are never in the actual signal. They are a digital filtering artefact from sin x / x that can show up on the display of a DSO. But Gibbs ears are never present in a real world signal you feed into a DSO. So you can't make Gibbs ears appear by performing any kind of operation on a real signal.
Mechatrommer:

--- Quote from: nctnico on October 29, 2023, 02:39:14 pm ---For the umpteenth time: Gibbs ears are never in the actual signal. They are a digital filtering artefact from sin x / x that can show up on the display of a DSO. But Gibbs ears are never present in a real world signal. So you can't make Gibbs ears appear by performing any kind of operation on a real signal.

--- End quote ---

i created this issue remember? so i ought to do the reading, thanks for emphasizing that for me ;) btw elephant toy is not an elephant... cheer.
Fungus:

--- Quote from: Mechatrommer on October 29, 2023, 02:34:23 pm --- its not Gibbs, but we could be mistakenly think is...

--- End quote ---

No we couldn't, because we know that "Gibbs" doesn't happen in a circuit.

Pre-ringing might, but that's not "Gibbs".
ebastler:

--- Quote from: nctnico on October 29, 2023, 02:39:14 pm ---For the umpteenth time: Gibbs ears are never in the actual signal. They are a digital filtering artefact from sin x / x that can show up on the display of a DSO. But Gibbs ears are never present in a real world signal you feed into a DSO. So you can't make Gibbs ears appear by performing any kind of operation on a real signal.

--- End quote ---

I dont think that is correct. If you build a higher-order, linear-phase lowpass filter and send a square wave through it -- frequency chosen such that e.g. the fundamental and the 3rd and 5th harmonic pass the filter -- what would you expect as the filter output signal?

You might use something like the LTC1064-7, for example: https://www.analog.com/media/en/technical-documentation/data-sheets/lt10647fb.pdf
Mechatrommer:

--- Quote from: Fungus on October 29, 2023, 02:53:40 pm ---
--- Quote from: Mechatrommer on October 29, 2023, 02:34:23 pm --- its not Gibbs, but we could be mistakenly think is...

--- End quote ---
No we couldn't, because we know that "Gibbs" doesn't happen in a circuit.

--- End quote ---
i know, but it happened on monitor, monitor as you saw in the attached picture is not circuit. i can show you what never happened and existed in this real world on your monitor :palm:
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