Notes concerning “Phase-locked loops”

• Is a phase vocoder or a bunch of PLLs a more efficient way to listen to all FM radio stations at once? 2018-06-17 (3 minutes)
• Using the Goertzel algorithm, the Minsky algorithm, PLLs, and prefix sums for frequency detection 2019-06-16 (updated 2019-07-05) (41 minutes)