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zeefaad
2025-10-07 12:58:52 +02:00
parent a4ad553067
commit 876d37d1ab
7 changed files with 1341 additions and 1 deletions
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79
FFT/ffttp.c Normal file
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#include <math.h>
#include <stdio.h>
#include <complex.h>
#include <stdint.h>
#include <stdlib.h>
complex float* fft(complex float* p, uint32_t N) {
complex float w = cexpf(-2 * I * M_PI / N);
if (N == 1)
return p;
complex float* pe = (complex float*)malloc(sizeof(complex float) * (N / 2));
complex float* po = (complex float*)malloc(sizeof(complex float) * (N / 2));
for (int i = 0; i < N - 1; i += 2) {
pe[i / 2] = p[i];
po[i / 2] = p[i + 1];
}
complex float* xe = fft(pe, N / 2);
complex float* xo = fft(po, N / 2);
complex float* ps = (complex float*)malloc(sizeof(complex float) * N);
for (int i = 0; i < N / 2; i++) {
ps[i] = xe[i] + cpowf(w, (complex float)i) * xo[i];
ps[i + N / 2] = xe[i] - cpowf(w, (complex float)i) * xo[i];
}
return ps;
}
int main() {
FILE *f = fopen("signal.csv","r");
if (!f) { perror("signal.csv"); return 1; }
double t, a;
int capacity = 1024, n = 0;
complex float *samples = malloc(sizeof(complex float) * capacity);
while (fscanf(f, "%lf;%lf", &t, &a) == 2) {
if (n >= capacity) {
capacity *= 2;
samples = realloc(samples, sizeof(complex float)*capacity);
}
samples[n++] = a;
}
fclose(f);
int fsize = 1 << (int)floorf(log2f((float)n));
complex float* cwav_data = (complex float*)malloc(sizeof(complex float) * fsize);
for (int i = 0; i < fsize; i++)
cwav_data[i] = samples[i];
complex float* ft = fft(cwav_data, fsize);
double Fe = 400.0;
FILE *gnuplot = popen("gnuplot -persistent", "w");
fprintf(gnuplot, "set title 'fft'\n");
fprintf(gnuplot, "set logscale x\n");
fprintf(gnuplot, "set logscale y\n");
fprintf(gnuplot, "plot '-' with linespoints title 'fft'\n");
for (int i = 0; i < fsize/2; i++) {
double freq = (double)i * Fe / fsize;
fprintf(gnuplot, "%f %f\n", freq ,cabsf(ft[i]));
}
fprintf(gnuplot, "e\n");
pclose(gnuplot);
free(samples);
free(cwav_data);
free(ft);
return 0;
}

2
FFT/fftwav.c
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@ -3,7 +3,7 @@
#include <complex.h>
#include <stdint.h>
#include <stdlib.h>
#include "../WAV/wav.h"
#include "../wav/wav.h"
complex float* fft(complex float* p, uint32_t N) {
complex float w = cexpf(-2 * I * M_PI / N);

476
FFT/signal.csv Normal file
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@ -0,0 +1,476 @@
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