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Show HN: Interactive Essay on Signals, Sampling and the Fourier Transform

jackschaedler.github.io

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Re: Show HN: Interactive Essay on Signals, Sampling and the Fourier Transform

#12

Post by shorodei »

jackschaedler wrote: post #9
streptomycin wrote: post #5

Normally I'd just upvote and move on, but this is really fucking good. For example, I wish I could have seen something like that "Sine Wave Aliasing" page when I was learning this stuff, would have saved me a lot of confusion.

Thanks! Let me know if there are other topics you'd like covered, or areas that need more explanation.

Another topic that has confounded me as much as FFTs are Quaternions.

Re: Show HN: Interactive Essay on Signals, Sampling and the Fourier Transform

#14

Post by protonfish »

gdubs wrote: post #10

This is an _incredibly_ well-crafted piece of work. I mean -- my god -- the pressure wave animation? [1] 1: http://jackschaedler.github.io/circles-sines-signals/sound.h...

The D3 animations work great for me in Chrome, but my Firefox is choking on them - especially this one.

Re: Show HN: Interactive Essay on Signals, Sampling and the Fourier Transform

#15

Post by cbd1984 »

shorodei wrote: post #12
jackschaedler wrote: post #9

Earlier quoted context omitted.

Thanks! Let me know if there are other topics you'd like covered, or areas that need more explanation.

Another topic that has confounded me as much as FFTs are Quaternions.

Take a look at geometric algebra.

http://www.geometricalgebra.net/

http://en.m.wikipedia.org/wiki/Geometric_algebra

Re: Show HN: Interactive Essay on Signals, Sampling and the Fourier Transform

#16

Post by calebreach »

jackschaedler wrote: post #9
streptomycin wrote: post #5

Normally I'd just upvote and move on, but this is really fucking good. For example, I wish I could have seen something like that "Sine Wave Aliasing" page when I was learning this stuff, would have saved me a lot of confusion.

Thanks! Let me know if there are other topics you'd like covered, or areas that need more explanation.

This is great! I'd love to see sections on convolution, the Dirac delta function, and the continuous (possibly multi-dimensional) Fourier transform.

Re: Show HN: Interactive Essay on Signals, Sampling and the Fourier Transform

#17

Post by GFK_of_xmaspast »

cbd1984 wrote: post #15
shorodei wrote: post #12

Earlier quoted context omitted.

Another topic that has confounded me as much as FFTs are Quaternions.

Take a look at geometric algebra. http://www.geometricalgebra.net/ http://en.m.wikipedia.org/wiki/Geometric_algebra

That's not quite the same, but worth reading up on anyway.

Re: Show HN: Interactive Essay on Signals, Sampling and the Fourier Transform

#18

Post by geographomics »

This is a wonderful piece of work. Exceptionally clear writing and excellent use of interactivity.

One minor bug report, the mathematical pi symbol (U+1D6D1) used in the unit circle doesn't appear to be displayed correctly (Chrome 40, Windows 7): https://i.imgur.com/zt0HDLO.png. It's okay in Firefox though.

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