Autocorrelation has been used in psychoacoustics at least since Licklider's work in the 1950s. But I'm not sure if I've seen this style of visualization before.

Autocorrelation has been used in psychoacoustics at least since Licklider's work in the 1950s. But I'm not sure if I've seen this style of visualization before. It looks a bit like the output of a strobe tuner.