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. Author manuscript; available in PMC: 2011 Mar 9.
Published in final edited form as: IEEE Trans Biomed Eng. 2009 Apr;56(4):1015. doi: 10.1109/TBME.2008.2005954

Figure 3.

Figure 3

Details of pitch period entropy (PPE) calculation: (a-b) pitch period p(t) in semitones relative to note C3 on the musical scale, (c-d) residual of pitch period r(t) after spectral whitening filter, (e-f) probability densities P(r) of residual pitch period r. PPE value is the entropy of this probability density). Left panels are for a healthy subject, right panel is for a person with Parkinson's.