1 #ifndef _Spectrum_extensions_h_ 2 #define _Spectrum_extensions_h_ 3 /* Spectrum_extensions.h 4 * 5 * Copyright (C) 1993-2021 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 /* 22 djmw 20010114 23 djmw 20020813 GPL header 24 djmw 20121022 Latest modification 25 */ 26 27 #include "Spectrum.h" 28 #include "Sound.h" 29 #include "Graphics.h" 30 31 autoSpectrum Spectrum_resample (Spectrum me, integer numberOfFrequencies); 32 33 autoSpectrum Spectrum_compressFrequencyDomain (Spectrum me, double fmax, integer interpolationDepth, int freqscale, int method); 34 35 autoSpectrum Spectrum_shiftFrequencies (Spectrum me, double shiftBy, double newMaximumFrequency, integer interpolationDepth); 36 // Shift will be plusminus dx/2 37 38 autoMatrix Spectrum_unwrap (Spectrum me); 39 /* 40 Unwrap the phases of the spectrum according to an algorithm by 41 Tribolet as published in: 42 43 Tribolet, J.M. & Quatieri, T.F. (1979), Computation of the Complex 44 Spectrum, in: Programs for Digital Signal Processing, 45 Digital Signal Processing Commitee (eds), IEEE Press, 46 chapter 7.1. 47 48 First row of returned matrix contains the amplitudes-squared, 49 second row contains the unwrapped phases. 50 */ 51 52 void Spectrum_drawPhases (Spectrum me, Graphics g, double fmin, double fmax, 53 double phase_min, double phase_max, int unwrap, bool garnish); 54 55 autoSpectrum Spectra_multiply (Spectrum me, Spectrum thee); 56 57 void Spectrum_conjugate (Spectrum me); 58 59 void Spectrum_shiftPhaseBy90Degrees (Spectrum me); 60 void Spectrum_unshiftPhaseBy90Degrees (Spectrum me); 61 62 void Spectrum_getMaximumInInterval (Spectrum me, double fromFrequencyHz, double toFrequencyHz, double *frequency, double *amplitude_dB); 63 64 65 #endif /* _Spectrum_extensions_h_ */ 66