3 ms·

So is this just a test to see if it's playing records at the right speed? Does it do anything else? Is it comparing it to a known-good recording of the song or

So is this just a test to see if it's playing records at the right speed? Does it do anything else? Is it comparing it to a known-good recording of the song or is it measuring how many cents the song deviates from a natural key? If it's the latter, I can say that I have many many records don't play back in a natural key. I have several records (45's) in my collection whose hole is not punched perfectly in the center and the pitch wavers up and down as the record rotates. How would this app react to that and what suggestion might it make to mitigate?

nomel 2y ago
Oh, you could probably solve that concentricity error by looking at the subtle repetitive wobbles in the spectrum. Period of the wobble would be related to the radius from the center, and the amplitude of the spectral shift would be relative to the radius and the concentricity error. I suspect modern direct drive could handle the modulation of their speed. I suspect this has been done already.