Toot

Written by Chuck on 2025-01-12 at 23:29

So I figured out the spurs were at 519Hz intervals (target frequency/8) for some reason. So I tried 4000Hz and got the included plot.

I'm glad I didn't get this first or I might have just moved on.

So this suggests what I'm seeing is "spectral leakage" which is an FFT artifact from the FFT assuming the signal you're looking at is just this repeating over and over and over. The Harris window I use should tamp that down but it may be a red herring.

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