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diff --git a/src/libspeex/quant_lsp.h b/src/libspeex/quant_lsp.h
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+/* Copyright (C) 2002 Jean-Marc Valin */
+/**
+   @file quant_lsp.h
+   @brief LSP vector quantization
+*/
+/*
+   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 QUANT_LSP_H
+#define QUANT_LSP_H
+
+#include <speex/speex_bits.h>
+#include "arch.h"
+
+#define MAX_LSP_SIZE 20
+
+#define NB_CDBK_SIZE 64
+#define NB_CDBK_SIZE_LOW1 64
+#define NB_CDBK_SIZE_LOW2 64
+#define NB_CDBK_SIZE_HIGH1 64
+#define NB_CDBK_SIZE_HIGH2 64
+
+/*Narrowband codebooks*/
+extern const signed char cdbk_nb[];
+extern const signed char cdbk_nb_low1[];
+extern const signed char cdbk_nb_low2[];
+extern const signed char cdbk_nb_high1[];
+extern const signed char cdbk_nb_high2[];
+
+/* Quantizes narrowband LSPs with 30 bits */
+void lsp_quant_nb(spx_lsp_t *lsp, spx_lsp_t *qlsp, int order, SpeexBits *bits);
+
+/* Decodes quantized narrowband LSPs */
+void lsp_unquant_nb(spx_lsp_t *lsp, int order, SpeexBits *bits);
+
+/* Quantizes low bit-rate narrowband LSPs with 18 bits */
+void lsp_quant_lbr(spx_lsp_t *lsp, spx_lsp_t *qlsp, int order, SpeexBits *bits);
+
+/* Decodes quantized low bit-rate narrowband LSPs */
+void lsp_unquant_lbr(spx_lsp_t *lsp, int order, SpeexBits *bits);
+
+/* Quantizes high-band LSPs with 12 bits */
+void lsp_quant_high(spx_lsp_t *lsp, spx_lsp_t *qlsp, int order, SpeexBits *bits);
+
+/* Decodes high-band LSPs */
+void lsp_unquant_high(spx_lsp_t *lsp, int order, SpeexBits *bits);
+
+#endif