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diff --git a/src/lingot-signal.h b/src/lingot-signal.h
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+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2011  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot 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.
+ *
+ * lingot 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 lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __LINGOT_SIGNAL_H__
+#define __LINGOT_SIGNAL_H__
+
+/*
+ peak identification functions.
+ */
+
+#include "lingot-defs.h"
+#include "lingot-config.h"
+
+// returns noise threshold at a given frequency w.
+FLT lingot_signal_get_noise_threshold(LingotConfig*, FLT w);
+
+// returns if buffer has a peak at given index
+int lingot_signal_is_peak(LingotConfig*, FLT* buffer, int index);
+
+// returns the maximum index.
+void lingot_signal_get_max(FLT *buffer, int N, int* Mi);
+
+// returns the index of the peak that carries the fundamental freq.
+int lingot_signal_get_fundamental_peak(LingotConfig*, FLT *x, FLT* y, int N);
+
+// generates a Hamming window of N samples
+void lingot_signal_window(int N, FLT* out, window_type_t window_type);
+
+#endif /*__LINGOT_SIGNAL_H__*/