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diff --git a/rhythm_quantum.h b/rhythm_quantum.h
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+/* Rhythm estimation in real time
+   Copyright (C) 2000 Jarno Seppänen and Piotr Majdak
+   $Id: rhythm_quantum.h,v 1.1 2002-11-19 11:39:55 ggeiger Exp $
+
+   This file is part of rhythm_estimator.
+
+   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.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
+
+#ifndef __RHYTHM_QUANTUM_H__
+#define __RHYTHM_QUANTUM_H__
+
+#include "rhythm_estimator.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* Parameter default values */
+#define RHYTHM_QUANTUM_DEFAULT_GCD_PERC		0.4 /* internal */
+#define RHYTHM_QUANTUM_GCD_PERC_MIN 0
+#define RHYTHM_QUANTUM_GCD_PERC_MAX 1
+
+typedef struct
+{
+    /* --- Public data --- */
+
+    /* User-changeable parameters: */
+
+    /* --- Private data --- */
+
+    /* Internal parameters: */
+    float		gcd_perc;
+    float   	max_quantum;
+    float   	min_quantum;
+    float   	ioi_resolution;
+
+    /* Internal "helper" variables */
+	float*		gcd_remainder_error; /* Length is below */
+	unsigned	gcd_re_length; /* ceil(max_quantum/ioi_resolution) */
+
+} Rhythm_Quantum;
+
+
+Rhythm_Quantum*	rhythm_quantum_new (void);
+void	rhythm_quantum_delete (Rhythm_Quantum* rhythm_quantum);
+
+void	rhythm_quantum_initialize (Rhythm_Quantum* rhythm_quantum);
+void	rhythm_quantum_finish (Rhythm_Quantum* rhythm_quantum);
+
+
+float   rhythm_quantum_compute_quantum (Rhythm_Quantum* rhythm_quantum, float *vector, unsigned len);
+
+    /* Subroutines */
+static float	rhythm_quantum_determine_quantum (Rhythm_Quantum* ge);
+static void	rhythm_quantum_compute_gcd_re (Rhythm_Quantum* ge, float *histogram, unsigned hist_len);
+
+static float	compute_median (float* vector, unsigned length);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __RHYTHM_QUANTUM_H__ */
+/* EOF */