mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
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88 lines
2.4 KiB
C++
88 lines
2.4 KiB
C++
/*
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* Copyright (C) 2023 Bernd Herzog
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "dsp_fft.hpp"
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#include "doctest.h"
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TEST_CASE("ifft successfully calculates dc on zero frequency") {
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uint32_t fft_width = 8;
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complex16_t* v = new complex16_t[fft_width];
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complex16_t* tmp = new complex16_t[fft_width];
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v[0] = {1024, 0}; // DC bin
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v[1] = {0, 0};
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v[2] = {0, 0};
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v[3] = {0, 0};
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v[4] = {0, 0};
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v[5] = {0, 0};
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v[6] = {0, 0};
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v[7] = {0, 0};
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ifft<complex16_t>(v, fft_width, tmp);
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CHECK(v[0].real() == 1024);
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CHECK(v[1].real() == 1024);
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CHECK(v[2].real() == 1024);
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CHECK(v[3].real() == 1024);
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CHECK(v[4].real() == 1024);
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CHECK(v[5].real() == 1024);
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CHECK(v[6].real() == 1024);
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CHECK(v[7].real() == 1024);
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for (uint32_t i = 0; i < fft_width; i++)
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CHECK(v[i].imag() == 0);
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free(v);
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free(tmp);
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}
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TEST_CASE("ifft successfully calculates pure sine of half the sample rate") {
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uint32_t fft_width = 8;
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complex16_t* v = new complex16_t[fft_width];
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complex16_t* tmp = new complex16_t[fft_width];
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v[0] = {0, 0};
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v[1] = {0, 0};
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v[2] = {0, 0};
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v[3] = {0, 0};
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v[4] = {1024, 0}; // sample rate /2 bin
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v[5] = {0, 0};
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v[6] = {0, 0};
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v[7] = {0, 0};
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ifft<complex16_t>(v, fft_width, tmp);
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CHECK(v[0].real() == 1024);
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CHECK(v[1].real() == -1024);
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CHECK(v[2].real() == 1024);
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CHECK(v[3].real() == -1024);
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CHECK(v[4].real() == 1024);
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CHECK(v[5].real() == -1024);
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CHECK(v[6].real() == 1024);
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CHECK(v[7].real() == -1024);
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for (uint32_t i = 0; i < fft_width; i++)
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CHECK(v[i].imag() == 0);
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free(v);
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free(tmp);
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}
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