1 files changed, 37 insertions, 0 deletions
diff --git a/gr-vocoder/lib/codec2/lsp.h b/gr-vocoder/lib/codec2/lsp.h
new file mode 100644
index 000000000..5acef0184
--- /dev/null
+++ b/gr-vocoder/lib/codec2/lsp.h
@@ -0,0 +1,37 @@
+/*---------------------------------------------------------------------------*\
+
+  FILE........: lsp.c
+  AUTHOR......: David Rowe
+  DATE CREATED: 24/2/93
+
+
+  This file contains functions for LPC to LSP conversion and LSP to
+  LPC conversion. Note that the LSP coefficients are not in radians
+  format but in the x domain of the unit circle.
+
+\*---------------------------------------------------------------------------*/
+
+/*
+  Copyright (C) 2009 David Rowe
+
+  All rights reserved.
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License version 2.1, as
+  published by the Free Software Foundation.  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 Lesser General Public License
+  along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __LSP__
+#define __LSP__
+
+int lpc_to_lsp (float *a, int lpcrdr, float *freq, int nb, float delta);
+void lsp_to_lpc(float *freq, float *ak, int lpcrdr);
+
+#endif