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diff --git a/libs/vamp-pyin/MonoPitchHMM.h b/libs/vamp-pyin/MonoPitchHMM.h
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+++ b/libs/vamp-pyin/MonoPitchHMM.h
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+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    pYIN - A fundamental frequency estimator for monophonic audio
+    Centre for Digital Music, Queen Mary, University of London.
+    
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifndef _MONOPITCHHMM_H_
+#define _MONOPITCHHMM_H_
+
+#include "SparseHMM.h"
+
+#include <boost/math/distributions.hpp>
+
+#include <vector>
+#include <cstdio>
+
+using std::vector;
+
+class MonoPitchHMM : public SparseHMM
+{
+public:
+    MonoPitchHMM();
+    const std::vector<double> calculateObsProb(const vector<pair<double, double> >);
+    // double getMidiPitch(size_t index);
+    // double getFrequency(size_t index);
+    void build();
+    double m_minFreq; // 82.40689f/2
+    size_t m_nBPS;
+    size_t m_nPitch;
+    size_t m_transitionWidth;
+    double m_selfTrans;
+    double m_yinTrust;
+    vector<double> m_freqs;
+};
+
+#endif