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Making our own spectrogram

A couple months ago I made a loudness meter and went way too in-depth into how humans have measured loudness over time.

A screenshot of the fasterthanlime audio meter, with RMS, sample peak, true peak, and various loudness metrics.

Today we’re looking at a spectrogram visualization I made, which is a lot more entertaining!

We’re going to talk about how to extract frequencies from sound waves, but also how my spectrogram app is assembled from different Rust crates, how it handles audio and graphics threads, how it draws the spectrogram etc.