1 #ifndef _Sound_and_Spectrum_dft_h_ 2 #define _Sound_and_Spectrum_dft_h_ 3 /* Sound_and_Spectrum_dft.h 4 * 5 * Copyright (C) 2021 David Weenink 6 * 7 * This code is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or (at 10 * your option) any later version. 11 * 12 * This code is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this work. If not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include "Sound.h" 22 #include "Spectrum.h" 23 24 /* 25 Speed up the DFT calculations by using the FFT on a resampled signal that has 26 exactly a power of 2 samples. 27 (after a suggestion by Ton Wempe). 28 */ 29 autoSpectrum Sound_to_Spectrum_dft (Sound me, integer interpolationDepth); 30 31 autoSound Spectrum_to_Sound_dft (Spectrum me, integer interpolationDepth); 32 33 #endif /* _Sound_and_Spectrum_dft_h_ */ 34