Does anyone have more stuff like this? Geometry animations, old

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>>792531

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>>792718

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>>792720

>>792728
Oh my god.

>>792531
Anime of cute triangles being congruent when?

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o

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not sure if it's topical, but I made some webm explaining modular synthesis a while ago.

this here is AM (amplitude modulation).
the idea is to modulate the amplitude of a certain waveform (carrier) in relation to an other one signal (input).

in this case I'm using a simple sine wave as both carrier and input signal and increasing the input's frequency over time.

File: AM explained 2.webm (4MB, 1256x472px) Image search: [Google]

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>>795380
and here's a more complex carrier wave still with a simple since input signal

>>792720
This reminds me of a puzzle.

>>792720
>not circular path
>am disapoint

>>792531
What's this song from?

>>795380
>explaining modular synthesis
I think you're unclear about the meaning of the term "explain". You made a webm with some moving lines on it. You don't even clearly define what you're showing, much less explain how it works. This is what, frequency domain on a log scale?

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>>795813
I think you could've figured out that this is just a simple spectogram.
X axis : frequency
Y axis : amplitude

and what's happening is also pretty obvious imo.
at a certain point, the input signal frequency is so high that it messes with the carrier's waveform.
i.e. instead of just hearing a tremolo, you hear a completely new sound.


I made like 20 of those just for AM, going into full detail, but most are a bit boring so I didn't want to clog up the thread.

though I have some other stuff about frequency modulation and stereo effects, if anyone's interested.

>>795380
>>795382
neat
does this have anything to do with the AM channel on radios?

>>795813
turn on the volume, dummy

>>795824
What program are these made in?

>>795824
i expected a drop

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>>795932
Yup.
When you use a radio, you actually set the carrier wave's frequency which will then be modulated by the radio signal.

>>796259
I used Ableton Live, but any DAW will do.
Though these programs are intended for music production, so if you just wanna mess around with some audio signals and spectograms, maybe don't use those.
Don't know what else you could use though.
Maybe Audacity has something similar. I don't know...
Anyways, this here is frequency modulation (FM).
It's similar to AM, but instead of modulating the carrier's amplitude, you change it's frequency.

In this example both carrier and input are sine waves and what I'm doing is cranking up the input's amplitude (creating a vibrato effect), then increasing it's frequency (going high enough to create interference/changing the sound) and finally turning the amplitude down again.

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>>796281
huh...
didn't know 4chan deletes triple returns...
whatever.

FM can create complex wave forms pretty quickly, which is why it's pretty useful for actual sound design.
PLus it's fun.

Here's a sine wave modulated by a sine wave modulated by a sine wave modulated by a sine wave.

>>792728
That's fucking sick!

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>>795824
>I think you could've figured out that this is just a simple spectogram.
It's not a spectrogram. A spectrogram has a time axis. What you posted is a frequency domain plot.
>and what's happening is also pretty obvious imo.
Yeah, to someone who already understands Fourier transforms, what it means to modulate a signal, and what an AM waveform looks like. But if you know that, you don't really need an explanation, do you?

My point, which I still stand behind, is that you haven't explained shit. You've just made graphs, and not even very useful ones. Showing a frequency domain plot of an AM signal is an absurdly counter-intuitive way to introduce AM because the amplitude on the graph has no direct relationship to the "amplitude" in "amplitude modulation". You can't see what's being modulated. You have to understand the AM waveform, modulation, and sidebands before the frequency domain plot makes any sense.

>>795786
Its the second opening to Shin Mazinger Z

but the first one is better

>>795702
>not disapoint at the start position
>am disapoint

https://www.youtube.com/watch?v=ZrKgyY5aDvA

some of the earliest computer animations

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>>796458
Don't really know why you're getting mad about this.
But whatever. Here's another AM experiment but with an oscilloscope like in your gif but on an audible scale.
Doesn't really make things much clearer imo...

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>>795380
>>795382
>>797343
Something's been bothering me since the first one and the latest helps clear it up. You're not doing AM. The chunk I clipped out of your video makes it very clear, that isn't be an AM waveform. In your signal, the amplitude of the carrier is constant but the midpoint between its min and max for a given cycle is moving. In a true AM signal, the midpoint is fixed and the amplitude of the carrier changes such that the upper and lower edges mirror the intelligence signal. Look more closely at >>796458

That also explains why there was an intelligence signal component in your time domain plots. In a true AM signal, the only frequency components should be the carrier and the upper and lower side frequencies (or bands, if the intelligence frequency isn't a pure tone). There is no component for the intelligence signal.

Amplitude modulation doesn't just mean linear addition of the intelligence signal to the carrier. There's a nonlinear conversion. See https://youtu.be/MLvQ3wI3QfM for a basic explanation.

>>792531
>old educational films
you mean like shake hands with danger?

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planetary gears.

>>798614
the wankel engine was an interesting design but ultimately suck compared to other kinds of engines, my favorite being the boxer engine

>>798708
the only problem with it is the corners getting worn out.
my favorite engine is the in-line. simple and it works.

>>798621
fuck! i finally understand how engines work

>>798740
diesel engines are slightly different tho.
just imagine no fuel coming in with the air and an injector instead of the spark plug.
they use compression instead of spark.

>>798758
depends on the engine though some newer diesel engines inject the diesel together with the air, there are even some experimental gasoline engines that functions like diesel engines that work without the need of spark plugs

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dumping my collection

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>>798799

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>>798804

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>>798809

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>>798811

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>>798821

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>>798825
love this one even though i know it would destroy itself if you make it do any actual work

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>>798830

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>>798835

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>>798840

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>>798843

>>798825
it feels like the picture is moving out which is kind of creepy because it don't

>>795380
>>795382
>>795824
This dubstep is terrible.

>>798610
Epicyclic gears.

>>796289

I don't know what the fuck is going on in any of these but this sound is gorgeous

>>798811

What is the use of this artifact? Is it the most powerful engine known to man?

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>>798947
they are mainly used for airplane propellers

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>>798851

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>>798962

>>798792
i guess cars have that stuff. haven't really had anything to do with car engines, mostly worked on engines for construction equipment

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>>798260
I think you're misunderstanding the scale at which these webms were made.

Or maybe I'm misunderstanding, in which case I'm sorry.

What happens is exactly like in >>796458

But the input signal is so high in comparison to the carrier that it not only changes the carrier's general amplitude, like in the wiki gif.
I also changes the wave form itself.

An audio signal is already a sort of amplitude modulation on itself. matter moves around at a certain frequency and amplitude.
So what happens when you start adding a similarly fast vibration to the mix?
It changes the overall waveform.
Which means that new frequencies different to both vibrations start to appear.

So let's do this one more time, but this time very very slowly.

Would you agree that the first part of this webm is similar to >>796458 ?
All I'm doing from then is increasing the tremolo frequency.

And for this carrier signal (a constant 220 Hz), we see interference popping up at ~12 Hz AM.

This experiment goes up to ~1.4 kHz btw.
And sorry for the shitty quality this time.

>>798610
thats what i found in a handmixer's foammexer part, but with only 3 small gear

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Ok fuck this modulation shit.
Let's do some stereo now.

First off, let's explain this UI.
It generates a 2D visualization of a stereo signal based on it's panoramic properties.

If you have a dot or a line on the vertical line, then both left and right channels are exactly the same (or at least partially similar).

If it's diagonally, then both signals are different (note the L and R show which diagonal is for which channel).

If it's horizontal, then both signal are phase mirrored.

Phase is a pretty complex subject, but let's just summarize it like this:

If you have a wave that's going UP then DOWN, then it's reversed phase is the same wave, only it's going Down then UP.

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>>799556
Here's what happens when you delay one of the channels by a couple of milliseconds.

there will be parts where both signals will be at the same position and parts where they're not.

So we get some neat shapes.

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>>799560
and here's the same but with a stereo chorus instead of the delay

>>799560
with what software do you make that?

>>799556
>>799560
>>799562
further reading

https://www.youtube.com/watch?v=l8m5L2gqHPw

>>799566
A DAW with a stereoscope plugin.
In this case it's Ableton Live and a plugin called Stereo Tool from Flux.

>>799540
>But the input signal is so high in comparison to the carrier that it not only changes the carrier's general amplitude
>And for this carrier signal (a constant 220 Hz)
>This experiment goes up to ~1.4 kHz btw.
That also helps explain some things. By definition with any type of analog modulation (AM, FM, PM) the carrier must have a higher frequency than the intelligence signal, usually by at least an order of magnitude. It's possible to modulate a carrier with a higher frequency signal, but it's useless from a technical standpoint. The result would be difficult or impossible to demodulate at the receiver. Assuming your modulator is constructed correctly (I'm still skeptical), that could explain why your waveform looks screwed up.

>Would you agree that the first part of this webm is similar to >>796458 ?
Could be, if that's where your input is ~20Hz and carrier is 220Hz.

>An audio signal is already a sort of amplitude modulation on itself.
I think you're misusing the term amplitude modulation. An audio signal has amplitude that varies with time, but not all signals with time-varying amplitude are AM. AM is a specific technique of combining an intelligence signal with a higher frequency carrier to take advantage of the carrier's propagation and bandwidth characteristics. The resulting signal should have frequency components for the carrier and two side bands which can be demodulated at the receiver to extract the intelligence signal.

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This thread has potential.

>>795382
>>795380
Analogfag here. Could you please tell us the software you use for those signal recordings ?

>>799732
The point of these experiments isn't to modulate in order to demodulate later.
It's to create interesting and complex sounds.
like for synths and sound effects.

>>799810
Ableton Live.
All digital, bae

>>802095
You claimed it was to explain AM, so I called you out on not explaining anything. Then I figured out that you don't even understand what AM is, so now you say it was just about making sounds.

That's fine. I'm not at all complaining about you making sounds or graphs or whatever. Make as many as you want. But if you're going to explain something, don't make people stupider for having heard your explanation.

>>799556
What is the musical track that you use as an example?

>>802148
>confusing am carrier signals for am audio manipulation.
>implying his explanation was stupid because you don't know the difference.

>>802148
I did explain what AM is.
I guess what you wanted was for me to talk about how radio AM transition works, which was never my goal.
And please point out where your genius brain figured out I didn't understand AM.
And yes, it was ALWAYS just about making sounds, which is why I started off all of this by calling it AM "SYNTHESIS" and not whatever the fuck you're thinking of.


>>802245
some garbage I made for a game a while ago.
https://soundcloud.com/azure-worm/cave?in=azure-worm/sets/crystal-gun-girl-ost

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pls stop fighting.
this is a good thread.

>>798708
Boxer engines are terrible. Their only benefit is that they have a lower center of gravity. They're inefficient and unreliable and underpowered.

>>798792
Every single (new) car on the planet has fuel injectors now Okay except maybe in India or something. Diesel Engines use the same basic idea of a mixture of air fuel. The difference is simply that the diesel engine ignites fuel by overcompressing it instead of having an external spark.

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>>802317
>implying his explanation was stupid because you don't know the difference.
He didn't explain anything. He just posted an unlabeled frequency domain plot (of something that isn't an AM signal) and a circular definition that amounts to "amplitude modulation means modulating the amplitude" Ah yes, perfectly clear now...

>>802338
>No. See above.

>And please point out where your genius brain figured out I didn't understand AM.
I had my suspicions from start, but the part where you claimed that an "audio signal is already a sort of amplitude modulation on itself" sealed the deal.

>And yes, it was ALWAYS just about making sounds, which is why I started off all of this by calling it AM "SYNTHESIS" and not whatever the fuck you're thinking of.
Do you realize that your previous posts are still in this thread? You never used the term AM synthesis. You called it "AM (amplitude modulation)", which has a specific definition that is not whatever the fuck you're doing. Then 795932 asked if it had to do with AM radios and you said "Yup". AM for sound synthesis is essentially the same as AM for radio, and even in that context your frequency domain plot is still obviously wrong. Whatever you're doing isn't AM with two simple sine waves by any common definition.

Look, I made you some pictures. These show the frequency and time domains of an AM signal with modulating frequencies of 20, 100, 500, and 1400 Hz (all sine wave). Notice how there are exactly 3 and only 3 components in the frequency domain: carrier, upper side frequency/band, and lower side frequency/band. Also notice that the level of the waveform always returns to zero during the carrier's period, even if the modulating frequency is higher than the carrier. That's the same whether it's for radio or sound synthesis.

>>792720
too bad it's the incorrect starting position...

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>>803670
ok now please read >>795380
>I made some webm explaining modular synthesis
>synthesis
I know. Reading is hard.

And I don't think you understand your own graph there, because what it's showing is EXACTLY what happened in >>795380 and >>799540 .
that third static frequency is just an indicator.

Also you how can you STILL deny that what I did is AM? Especially after seeing >>799540

I'm starting to thing you're just shitposting...

Awesome thread is awesome.

>>809571
>that third static frequency is just an indicator.
Are you fucking retarded? That's the carrier, which by definition is one of the three parts of an AM signal. Yours have no carrier component. Where did it go? And what's all the other low-amplitude stuff in there? There shouldn't be any noise in a software-generated signal that never leaves the computer, so whatever you're doing is introducing a bunch of harmonics. That shouldn't happen with AM using simple sine waves.

And you're bringing up >>799540 again without addressing your claim that "An audio signal is already a sort of amplitude modulation on itself." That's just fucking wrong. Totally, completely, no two ways about it wrong. If that isn't obvious to you, you don't understand amplitude modulation at all.

>>809571
>Also you how can you STILL deny that what I did is AM? Especially after seeing >>799540
I'm really not sure what you did, but it's sure as hell not AM with a simple sine wave carrier and simple sine wave input. Maybe it's double-sideband suppressed carrier with triangle waves, but who knows. You clearly don't.

We're just going in circles at this point and you obviously have no idea what the fuck you're talking about. This is a waste of time. I'm going to conclude that you're too stubborn or too stupid to understand how AM works. You might want to consider refraining from "explaining" anything until you have a grasp of it yourself.

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BEST THREAD EVER MADE IN ALL OF 4CHAN HISTORY

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>>809717

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>>809720

>>797343
this is so pretty

>>809133
What?
There are over 13 trillion different versions of the knight's tour on an 8x8 board, how is this one incorrect?
https://en.wikipedia.org/wiki/Knight%27s_tour

>>799773
>no sound

>>798874
first actual lol in over a year

>>798610
planetary gearset

>>792728
Please explain this to me.

>>809932
Fourier transform is an equation used to derive the component frequencies of a waveform.
The original waveform seen in red is a combination of every frequency along the raised blue line.
The original waveform isn't always a combination of similar frequencies though, the result is often several separate peaks at various frequencies.
This is useful in all sorts of signal analysis because it makes the component frequencies plain to see.

>>798960
that plane has a v-configuration tho

>>796289
>>796281
>>795824
>>795382
>>795380
These are oddly hypnotic and satisfying.

>>798874
Lol'ed 1st time in a long time

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>>798960
>>809995
It's a radial engine. Used in WW1. They are still used today, pic related.

Bump for more physics and geometry

>>810916
Oh I forgot to add. This is used to compute work, which is a force times distance. That is a force field (f) through which the path moves (C).

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>>799773
Audio is for audio, not video.

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>>798825

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Captcha wants pumpkins. So close.

>>799773
>>809872
>>812163
I'd be interested to hear what that audio signal sounds like. Probably some kind of incomprehensible screech, but I still want to know.

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>>812184
oh man.
laughed out loud there at the end

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>>812183
The audio in >>812163 is actually what you hear, the video on the oscilloscope is from PS2's composite output. The same signal (cable) is also used to show picture on the TV.

As for the other one, I don't really think you can hear 96kHz.

>>812205
>As for the other one, I don't really think you can hear 96kHz.
I'm pretty sure that's referring to a 96kHz sample rate in the DAC. The frequency of the audio signal itself is going to vary all over the place to produce the output pattern, but there's a good chance some of it will fall in the audible spectrum.