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Re: Is correlation any good for pitch perception?">

Please do not equate spectrum and correlation. As Gerald Langner has shown:
Cepstrum/ACF/periodicity on the one hand and spectrum on the other hand are
two orthogonal representations of the same signal.

Eckard Blumschein
I wonder why ACF and spectrum are orthogonal representations and how did Langner demonstrate that?

Ramdas Kumaresan