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 pitch estimator, and more accurate maximum-likelihood methods have been worked out [114,547,376,377]. More recently, Klapuri has been developing some promising methods for multiple pitch estimation [254,253,252].7.12A comparison of real-time pitch-tracking algorithms applied to guitar is given in , with consideration of latency (time delay).
Extension to Stiff Strings
Approximate Maximum Likelihood F0 Estimation