An often-cited book on classical methods for pitch detection, particularly for voice, is that by Hess . The harmonic-comb method can be considered an approximate maximum-likelihood estimator for fundamental frequency, and more accurate maximum-likelihood methods have been worked out [65,297,230,231]. Another highly regarded method for estimation is the YIN algorithm . For automatic transcription of polyphonic music, Klapuri has developed methods for multiple estimation [189,127,126,124].11.2Finally, a rich source of methods may be found in the conference proceedings for the field of Music Information Retrieval (MIR)11.3 Of course, don't forget to try a Web search for ``F0 estimation'' and the like.
Getting Closer to Maximum Likelihood