#3867 Website Spectrum Analysis Data-Drive Digital Art
#3867 Website Spectrum Analysis Data-Drive Digital Art #3867 My web app has a spectrum analyzer that displays 24-36 vertical bars across the spectrum that react to the MP3 audio. Can I consider each one of these bars to be a set of values that I can reference from JavaScript? Yes, absolutely. The visualization you see on the screen is just the "paint" on top of a raw array of numbers that exists in memory. In the Web Audio API (which most web spectrum analyzers use), those bars correspond to a TypedArray (usually a Uint8Array ) representing frequency data. Here is how you can access and manipulate those values in JavaScript. 1. The Underlying Mechanism: AnalyserNode The logic works like this: Audio Source (MP3) $\rightarrow$ AnalyserNode $\rightarrow$ Destination (Speakers). The AnalyserNode performs a Fast Fourier Transform (FFT) to break the sound into frequency "bins." Your visualization loop calls a method (usually getByteFrequencyData ) to grab a snapsh...