17.11: Sound Visualization: Frequency Analysis with FFT - p5.js Sound Tutorial

In this video, I use the p5.FFT object to analyze the frequencies (spectrum array) of a sound file. I create a "graphic equalizer" like visualization. Code: https://thecodingtrain.com/tracks/sou...

🕹️ p5.js Web Editor Sketch: https://editor.p5js.org/codingtrain/s...

🎥 Previous:    • 17.10: Sound Visualization: Radial Gr...  

References:
🔗 p5.sound library: https://p5js.org/reference/#/librarie...
🔗 p5.FFT: https://p5js.org/reference/#/p5.FFT
🔗 this.dot song:   / this-dot-feat-daniel-shiffman  

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Timestamps:
0:00 Introduction
0:43 p5.FFT object
1:27 Wikipedia page about FFT
1:59 Explain the algorithm
2:34 Amplitude at different frequency levels
2:57 Bins must be a power of 2
3:23 Add a p5.FFT object to sketch
4:16 Use analyze() to get the amplitude values along the frequency domain.
4:56 Default length of array is 1024 bins
6:16 Loop through the array
7:23 Values range between 0 and 255
8:50 Reduce the number of bins to 64
9:24 Space out the lines
9:59 Change the lines to rectangles
11:02 Add the smoothing - default is 0.8
12:59 Change to a circle
14:47 Adjust mapping to get full circle
16:19 Draw lines from the center
16:52 Suggestions for possible variations

Editing by Mathieu Blanchette
Animations by Jason Heglund
Music from Epidemic Sound

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🔗 p5.js: https://p5js.org
🔗 p5.js Web Editor: https://editor.p5js.org/
🔗 Processing: https://processing.org

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#soundvisualization #frequencyanalysis #fft #p5js