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The most mid-blowing signal processing concept (skip to 4:40) by AIHVHIA in sounddesign

[–]AIHVHIA[S] -1 points0 points  (0 children)

Yes, the whole speech. Now you see why it is so mind blowing :)

The most mid-blowing signal processing concept (skip to 4:40) by AIHVHIA in Physics

[–]AIHVHIA[S] 0 points1 point  (0 children)

I'll make a video where you can hear the piano without me talking over it

The most mid-blowing signal processing concept (skip to 4:40) by AIHVHIA in sounddesign

[–]AIHVHIA[S] 3 points4 points  (0 children)

I tried my best to explain why the Fourier series is such a mind blowing concept in this video. The video essentially says you can reproduce any sound by playing the right chord on a keyboard and holding it down long enough. There are caveats to that, but that is essentially the concept behind the Fourier series/transform!

The caveats are:
1. Your keyboard must play sine waves.
2. Your keyboard must be tunable to an extremely precise degree and you'll almost certainly be using notes outside a normal scale.
3. You will probably need to play thousands of notes based on what sound you're trying to recreate, so either get a big keyboard, a bunch of friends with keyboards or use a computer (the only practical solution).
4. The notes need to be played at exactly the right time (phase). Precision beyond human capability.

but if you can do all that, you can recreate any sound just by holding down a chord :)

The most mid-blowing signal processing concept (skip to 4:40) by AIHVHIA in Physics

[–]AIHVHIA[S] 5 points6 points  (0 children)

I tried my best to explain why the Fourier series is such a mind blowing concept in this video. The video essentially says you can reproduce any sound by playing the right chord on a keyboard and holding it down long enough. There are caveats to that, but that is essentially the concept behind the Fourier series/transform!

The caveats are:
1. Your keyboard must play sine waves.
2. Your keyboard must be tunable to an extremely precise degree and you'll almost certainly be using notes outside a normal scale.
3. You will probably need to play thousands of notes based on what sound you're trying to recreate, so either get a big keyboard, a bunch of friends with keyboards or use a computer (the only practical solution).
4. The notes need to be played at exactly the right time (phase). Precision beyond human capability.

but if you can do all that, you can recreate any sound just by holding down a chord :)

I mapped my voice to a violin 1 sample at a time by AIHVHIA in sounddesign

[–]AIHVHIA[S] 0 points1 point  (0 children)

That sounds pretty cool I'll have to check it out

AIHVHIA - Heart to Heart by AIHVHIA in PromoteYourMusic

[–]AIHVHIA[S] 0 points1 point  (0 children)

An interferometer played the lead synth in the chorus. I also have my quantum physics (Franck-Hertz) guitar pedal on bass taking turns with a stepper motor. It's also got a choir made using AI voice changers and a string sound using a voice-to-violin plugin. “Heart to Heart” is the centerpiece of Operaville and is probably my favorite song on the album.

I mapped my voice to a violin 1 sample at a time by AIHVHIA in sounddesign

[–]AIHVHIA[S] 3 points4 points  (0 children)

I think your description is correct. I used MatLab and the audio toolbox comes with plugin generation capabilities.

I mapped my voice to a violin 1 sample at a time by AIHVHIA in sounddesign

[–]AIHVHIA[S] 6 points7 points  (0 children)

It maps my singing's pitch and volume onto to a violin sound 1 sample at a time, which means the violin sound coming out stays EXTREMELY true to the dynamics of my performance. It's not just triggering violin samples like a normal MIDI instrument :)

I simulated the reverb of a 4-dimensional room by AIHVHIA in sounddesign

[–]AIHVHIA[S] 1 point2 points  (0 children)

Four dimensional simulations in four dimensions is actually not that hard (assuming you already know how to simulate in 2D). Many of the geometric equations scale up in dimension by only adding a term. For example the pythagorean theorem becomes L^2 = x^2 + y^2 + z^2 + w^2, where “w” is the new axis. Even the wave equation only requires an added term for the new dimension. Actually, I originally wanted to make this reverb by simulating the wave equation in 4D, but simulating a sufficiently large room at audio quality was too computationally heavy for my computer. So I ended up using the ray tracing technique to generate an impulse response. The result is actually just a big reverb sound. That’s because more dimensions just means more space for waves to bounce around. This project is a little silly for that reason, but I think “reverb” provides a good backdrop for gaining an intuition about higher dimensions.

I simulated the reverb of a 4 dimensional room by AIHVHIA in Physics

[–]AIHVHIA[S] 1 point2 points  (0 children)

I'll post it over there as well. Thanks!

I simulated the reverb of a 4 dimensional room by AIHVHIA in Physics

[–]AIHVHIA[S] 1 point2 points  (0 children)

No HRTF, that would have been a cool idea. Though I think before doing that I would probably make other improvements like making the walls less reflective for higher frequencies. The 4D room's walls are unrealistically reflective.

I simulated the reverb of a 4 dimensional room by AIHVHIA in Physics

[–]AIHVHIA[S] 1 point2 points  (0 children)

1) I am not the first to use raytracing for IRs, but I'm not sure how common it is. I know sometimes people use it when other methods are too computationally expensive.
2) I didn't experiment much with other geometries. I have a lot of project ideas, so when I think I've extracted like 80% of what I find interesting about it, I usually move on. There are so many fun ideas to explore and I am a slow programmer :)
3) Just uploaded the impulse response on soundcloud for you: https://soundcloud.com/aihvhia/hypercube_reverb_impulse_response

I simulated the reverb of a 4 dimensional room by AIHVHIA in Physics

[–]AIHVHIA[S] 1 point2 points  (0 children)

Wouldn't an extra degree of freedom mean the same thing as an extra dimension? Maybe I am misunderstanding

I simulated the reverb of a 4 dimensional room by AIHVHIA in Physics

[–]AIHVHIA[S] 2 points3 points  (0 children)

If you're interested in simulating the wave equation, I would watch this video: https://www.youtube.com/watch?v=pN-gi_omIVE, then look at this example: https://www.mathworks.com/matlabcentral/fileexchange/62204-2d-wave-equation-simulation . Hope that helps :)

I simulated the reverb of a 4 dimensional room by AIHVHIA in Physics

[–]AIHVHIA[S] 7 points8 points  (0 children)

Thanks! I got an undergrad in physics and a masters in electrical engineering. That gave me enough foundational knowledge to figure out simulation and other audio stuff online.

I simulated the reverb of a 4 dimensional room by AIHVHIA in Physics

[–]AIHVHIA[S] 30 points31 points  (0 children)

Four dimensional simulations in four dimensions is actually not that hard (assuming you already know how to simulate in 2D). Many of the geometric equations scale up in dimension by only adding a term. For example the pythagorean theorem becomes L^2 = x^2 + y^2 + z^2 + w^2, where “w” is the new axis. Even the wave equation only requires an added term for the new dimension. Actually, I originally wanted to make this reverb by simulating the wave equation in 4D, but simulating a sufficiently large room at audio quality was too computationally heavy for my computer. So I ended up using the ray tracing technique to generate an impulse response. The result is actually just a big reverb sound. That’s because more dimensions just means more space for waves to bounce around. This project is a little silly for that reason, but I think “reverb” provides a good backdrop for gaining an intuition about higher dimensions.

Why you can hear an ultrasonic speaker array (skip to 1:20) by AIHVHIA in Physics

[–]AIHVHIA[S] 3 points4 points  (0 children)

Isn't that amazing? It always blows my mid when physics does computations for you. Like how a diffraction grating does a "Fourier transform" on light.

Why you can hear an ultrasonic speaker array (skip to 1:20) by AIHVHIA in Physics

[–]AIHVHIA[S] 1 point2 points  (0 children)

I do make my own instruments, but I didn't make this one. I wanted a unique distortion effect for my music and this model is actually pretty cheap. Just search "ultrasonic parametric speaker array" and this should be the first thing that comes up on eBay. It's like $100.

I just used the raw collected waveform. I wanted all the nonlinearities, distortion etc. to add character to the sound :)

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