From f02dfce6e6c34b3d8a7b8a0e784b506178e331fa Mon Sep 17 00:00:00 2001 From: "erdgeist@erdgeist.org" Date: Thu, 4 Jul 2019 23:26:09 +0200 Subject: stripdown of version 0.9 --- lpc.h | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 lpc.h (limited to 'lpc.h') diff --git a/lpc.h b/lpc.h new file mode 100644 index 0000000..482aa1f --- /dev/null +++ b/lpc.h @@ -0,0 +1,43 @@ +/*---------------------------------------------------------------------------*\ + + FILE........: lpc.h + AUTHOR......: David Rowe + DATE CREATED: 24/8/09 + + Linear Prediction functions written in C. + +\*---------------------------------------------------------------------------*/ + +/* + Copyright (C) 2009-2012 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 . +*/ + +#ifndef __LPC__ +#define __LPC__ + +#define LPC_MAX_ORDER 20 + +void pre_emp(float Sn_pre[], float Sn[], float *mem, int Nsam); +void de_emp(float Sn_se[], float Sn[], float *mem, int Nsam); +void hanning_window(float Sn[], float Wn[], int Nsam); +void autocorrelate(float Sn[], float Rn[], 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 -- cgit v1.2.3