From c04af18902322cea1bd05b6f01b7860ca7bfa432 Mon Sep 17 00:00:00 2001 From: Piotr Pawlow Date: Thu, 13 Mar 2014 20:51:31 +0100 Subject: - import version 0.9.1 from upstream --- src/lingot-filter.h | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 src/lingot-filter.h (limited to 'src/lingot-filter.h') diff --git a/src/lingot-filter.h b/src/lingot-filter.h new file mode 100644 index 0000000..6da7c99 --- /dev/null +++ b/src/lingot-filter.h @@ -0,0 +1,65 @@ +/* + * lingot, a musical instrument tuner. + * + * Copyright (C) 2004-2011 Ibán Cereijo Graña, Jairo Chapela Martínez. + * + * This file is part of lingot. + * + * lingot is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * lingot 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 General Public License + * along with lingot; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef __LINGOT_FILTER_H__ +#define __LINGOT_FILTER_H__ + +#include +#include + +#include "lingot-defs.h" + +/* + digital filtering implementation. + */ + +typedef struct _LingotFilter LingotFilter; + +struct _LingotFilter + { + + FLT* a; + FLT* b; // coefs + FLT* s; // status + + unsigned int N; + + }; + +LingotFilter + * lingot_filter_new(unsigned int Na, unsigned int Nb, FLT* a, FLT* b); + +/** + * Design a Chebyshev type I low pass filter with Rp dB of pass band ripple + * with cutoff pi*wc radians. + */ +LingotFilter* lingot_filter_cheby_design(unsigned int order, FLT Rp, FLT wc); + +void lingot_filter_destroy(LingotFilter*); + +// Digital Filter Implementation II, in & out overlapables. Vector filtering +void lingot_filter_filter(LingotFilter*, unsigned int n, FLT* in, FLT* out); + +// sample filtering +FLT lingot_filter_filter_sample(LingotFilter*, FLT in); + +#endif -- cgit v1.2.3