gr-vocoder: re-implemented gr-codec2-vocoder inside gr-vocoder

1 files changed, 42 insertions, 0 deletions

diff --git a/gr-vocoder/lib/codec2/lpc.h b/gr-vocoder/lib/codec2/lpc.h
new file mode 100644
index 000000000..ead05e1ba
--- /dev/null
+++ b/gr-vocoder/lib/codec2/lpc.h
@@ -0,0 +1,42 @@
+/*---------------------------------------------------------------------------*\
+                                                                           
+  FILE........: lpc.h                                                            
+  AUTHOR......: David Rowe                                                      
+  DATE CREATED: 24/8/09                                                   
+                                                                          
+  Linear Prediction functions written in C.                                
+                                                                          
+\*---------------------------------------------------------------------------*/
+
+/*
+  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 __LPC__
+#define __LPC__
+
+#define LPC_MAX_ORDER 20
+
+void hanning_window(float Sn[],	float Wn[], int Nsam);
+void autocorrelate(float Sn[], float Rn[], int Nsam, int order);
+void autocorrelate_freq(float Pw[], float w[], float  R[], int Nsam, int order);
+void levinson_durbin(float R[],	float lpcs[], int order);
+void inverse_filter(float Sn[], float a[], int Nsam, float res[], int order);
+void synthesis_filter(float res[], float a[], int Nsam,	int order, float Sn_[]);
+void find_aks(float Sn[], float a[], int Nsam, int order, float *E);
+void weight(float ak[],	float gamma, int order,	float akw[]);
+
+#endif