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author | Yann Herklotz <ymherklotz@gmail.com> | 2018-03-05 13:39:46 +0000 |
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committer | Yann Herklotz <ymherklotz@gmail.com> | 2018-03-05 13:39:46 +0000 |
commit | 6d1622b38a4153c6fd0de24f57e3654b706e78d0 (patch) | |
tree | 865e608e584965cae3c164a1897e0896b798be8d /Project/TestCode | |
parent | c394d751491782dfe485b0929c0e1343674872f4 (diff) | |
download | NoiseSilencer-6d1622b38a4153c6fd0de24f57e3654b706e78d0.tar.gz NoiseSilencer-6d1622b38a4153c6fd0de24f57e3654b706e78d0.zip |
[DFT] Fixed code
Diffstat (limited to 'Project/TestCode')
-rw-r--r-- | Project/TestCode/dft.c | 31 |
1 files changed, 20 insertions, 11 deletions
diff --git a/Project/TestCode/dft.c b/Project/TestCode/dft.c index d0dca12..e82cb3e 100644 --- a/Project/TestCode/dft.c +++ b/Project/TestCode/dft.c @@ -1,8 +1,9 @@ #include <math.h> #include <stdio.h> +#include <stdlib.h> #define E_PI 3.1415926535897932384626433832795028841971693993751058209749445923078164062 -#define N 8 +#define N_DEF 8 typedef struct { float r; @@ -10,12 +11,10 @@ typedef struct { } Complex; float x[] = {0, 0, 2, 3, 4, 0, 0, 0}; -Complex X[N]; -float x_out[N]; void dft(int N, Complex *X) { int i, n, k; - Complex x[N]; + Complex *x = malloc(N * sizeof(X[0])); for(i = 0; i < N; ++i) { x[i] = X[i]; } @@ -27,11 +26,12 @@ void dft(int N, Complex *X) { X[k].i -= x[n].r * sin(2 * E_PI * k * n / N); } } + free(x); } void idft(int N, Complex *X) { int i, n, k; - Complex x[N]; + Complex *x = malloc(N * sizeof(X[0])); for(i = 0; i < N; ++i) { x[i] = X[i]; } @@ -41,15 +41,24 @@ void idft(int N, Complex *X) { for(k = 0; k < N; ++k) { X[n].r += x[k].r * cos(2 * E_PI * k * n / N) - x[k].i * sin(2 * E_PI * k * n / N); } - X[n] /= N; + X[n].r /= N; } + free(x); } int main() { int k; - dft(); - idft(); - for(k = 0; k < N; ++k) { - printf("x[%d] = %.2f, X[%d] = %.2f + %.2fi, x_out[%d] = %.2f\n", k, x[k], k, X[k].r, X[k].i, k, x_out[k]); + Complex X_C[8]; + for(k = 0; k < N_DEF; ++k) { + X_C[k].r = x[k]; + X_C[k].i = 0; + } + dft(N_DEF, X_C); + for(k = 0; k < N_DEF; ++k) { + printf("x[%d] = %.2f, X[%d] = %.2f + %.2fi\n", k, x[k], k, X_C[k].r, X_C[k].i); } -}
\ No newline at end of file + idft(N_DEF, X_C); + for(k = 0; k < N_DEF; ++k) { + printf("x[%d] = %.2f, X[%d] = %.2f + %.2fi\n", k, x[k], k, X_C[k].r, X_C[k].i); + } +} |