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diff --git a/src/libspeex/lsp.h b/src/libspeex/lsp.h
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+/*---------------------------------------------------------------------------*\
+Original Copyright
+	FILE........: AK2LSPD.H
+	TYPE........: Turbo C header file
+	COMPANY.....: Voicetronix
+	AUTHOR......: James Whitehall
+	DATE CREATED: 21/11/95
+
+Modified by Jean-Marc Valin
+
+    This file contains functions for converting Linear Prediction
+    Coefficients (LPC) to Line Spectral Pair (LSP) and back. Note that the
+    LSP coefficients are not in radians format but in the x domain of the
+    unit circle.
+
+\*---------------------------------------------------------------------------*/
+/**
+   @file lsp.h
+   @brief Line Spectral Pair (LSP) functions.
+*/
+/* Speex License:
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+   
+   - Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+   
+   - Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+   
+   - Neither the name of the Xiph.org Foundation nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+   
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
+   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef __AK2LSPD__
+#define __AK2LSPD__
+
+#include "arch.h"
+
+int lpc_to_lsp (spx_coef_t *a, int lpcrdr, spx_lsp_t *freq, int nb, spx_word16_t delta, char *stack);
+void lsp_to_lpc(spx_lsp_t *freq, spx_coef_t *ak, int lpcrdr, char *stack);
+
+/*Added by JMV*/
+void lsp_enforce_margin(spx_lsp_t *lsp, int len, spx_word16_t margin);
+
+void lsp_interpolate(spx_lsp_t *old_lsp, spx_lsp_t *new_lsp, spx_lsp_t *interp_lsp, int len, int subframe, int nb_subframes);
+
+#endif	/* __AK2LSPD__ */