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Since I love playing music on my piano, and because I love programming, I created this:
A program which uses YIN (some kind of FFT algorithm) to create this audio spectrum. It can read from any audio source, be it microphone or the computers audio output. There are 3 lines in the graph at the bottom:
Both magenta lines, both are movable, allow you to just select a part of the audio spectrum to show, which is very useful if you just want to get the chords out of a song, or just the notes.
The cyan line can also be moved, it tells the program the lower limit to calculate the actual notes/chords from the frequency bars (which are calculated by the FFT algorithm).
In the top right of the spectrum is, in magenta color, one single note. It shows the currently loudest frequency as a note.
In the top right corner is a simple image of a one-octave piano. Every note over the cyan line will be shown on this piano. This is very useful for chords.
Since compression will fuck this image up, here is a link: https://i.gyazo.com/fbbee76faecbac3...
What do you think about it? I fucking love it.
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In my last year of high school (for those familiar with the Indian education system, that's Class 12), for my final project I made an image compressor/decompressor in Turbo C++ that used a discrete Fourier transform (DCT, actually) to work on 8x8 px blocks of images. I based it off some stuff I found about how JPEG compression works. It worked even better than I'd hoped even though it was slow as molasses (I programmed a naive Fourier transform instead of using a FFT variant). I remember jumping with joy all around my room at 3 o'clock in the morning like an excited gas molecule in a box. Fun times.
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For anyone interested in Digital Signal Processing, I wrote a little tool in C[1] that implements the FFT algorithm and takes audio samples to visualise the spectrum using raylib.
I might later add low pass and high pass filters.
[1]: https://github.com/mirimmad/FFTViz8 -
I have to implement DSP using Convolution, FFT. And for the past 2 days I have like a million tabs open in Chrome and half of the titles end with ".... for dummies" :D
At least I'm learning something new and when I understand what the math behind those terms does I feel awesome :D
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