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-fft.h | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 src/lingot-fft.h (limited to 'src/lingot-fft.h') diff --git a/src/lingot-fft.h b/src/lingot-fft.h new file mode 100644 index 0000000..6195da0 --- /dev/null +++ b/src/lingot-fft.h @@ -0,0 +1,51 @@ +/* + * 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_FFT_H_ +#define _LINGOT_FFT_H_ + +/* + Fourier transforms. + */ + +#include "lingot-defs.h" + +#ifndef LIB_FFTW + +# include "lingot-complex.h" +# include "lingot-config.h" + +void lingot_fft_create_phase_factors(LingotConfig* conf); +void lingot_fft_destroy_phase_factors(); + +// Fast Fourier Transform implementation. +void lingot_fft_fft(FLT* in, LingotComplex* out, unsigned long int N); + +#endif // not LIB_FFTW + +// Spectral Power Distribution (SPD) esteem, selectively in frequency. +void lingot_fft_spd(FLT* in, int N1, FLT wi, FLT dw, FLT* out, int N2); + +// first and second SPD derivatives at frequency w. +void lingot_fft_spd_diffs(FLT* in, int N, FLT w, FLT* out_d1, FLT* out_d2); + +#endif -- cgit v1.2.3