The MPM algorithm is an even better variation on autocorrelation than YIN.<p>It picks the first peak of the autocorrelation after zero-crossing that is greater than k*(max peak). k~=0.9<p><a href="http:&#x2F;&#x2F;www.cs.otago.ac.nz&#x2F;tartini&#x2F;papers&#x2F;A_Smarter_Way_to_Find_Pitch.pdf" rel="nofollow">http:&#x2F;&#x2F;www.cs.otago.ac.nz&#x2F;tartini&#x2F;papers&#x2F;A_Smarter_Way_to_Fi...</a>