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regularfry
26 days ago
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Guitar tuner that uses phone accelerometer
Every non-linear mixing of signals gives you sum and difference frequencies. It's less a weird PLL thing and more a weird trig function thing.
kayson
26 days ago
[–]
Its not even a non linear thing. Its a sampling thing. Even ideal sampling exhibits aliasing.
https://en.wikipedia.org/wiki/Nyquist%E2%80%93Shannon_sampli...
regularfry
24 days ago
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Yes, and. You can look at aliasing as a special case of heterodyning. Sampling
is
a nonlinear mixing.
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