from scipy import signal b, a = signal.butter(8, [0.2,0.8], 'bandpass') filtedData = signal.filtfilt(b, a, data) 将上面的python代码转成C语言代码
时间: 2024-01-23 16:03:20 浏览: 29
以下是将上述 Python 代码转换为 C 代码的示例:
```c
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define ORDER 8
#define NUM_TAPS ORDER + 1
void butter_bandpass_filter(double *x, double *y, int n, double fs, double f_low, double f_high) {
double wn[2] = {2 * f_low / fs, 2 * f_high / fs};
double b[NUM_TAPS], a[NUM_TAPS];
int i, j;
double sum;
// Compute filter coefficients
double a0 = 1.0;
for (i = 0; i < ORDER; i++) {
b[i] = sin(M_PI * (2 * i + 1) / (4 * ORDER)) * exp(-1 * log(4) * wn[1]);
a[i] = 0.0;
}
b[ORDER] = cos(M_PI * wn[0]) - cos(M_PI * wn[1]) + sin(M_PI * wn[0]) * exp(-1 * log(4) * wn[1]);
a[ORDER-1] = -1 * cos(M_PI * wn[0]) - cos(M_PI * wn[1]);
a[ORDER] = 1.0 - sin(M_PI * wn[0]) * exp(-1 * log(4) * wn[1]);
// Filter data
for (i = 0; i < n; i++) {
y[i] = b[0] * x[i];
for (j = 1; j < NUM_TAPS; j++) {
if (i >= j) {
y[i] += b[j] * x[i-j] - a[j] * y[i-j];
}
}
}
// Reverse data and filter again
for (i = 0; i < n / 2; i++) {
double tmp = y[i];
y[i] = y[n-i-1];
y[n-i-1] = tmp;
}
for (i = 0; i < n; i++) {
sum = 0.0;
for (j = 0; j < NUM_TAPS; j++) {
if (i >= j) {
sum += b[j] * y[i-j];
if (j > 0) {
sum -= a[j] * y[i-j];
}
}
}
y[i] = sum;
}
}
int main() {
double data[100] = { /* your data here */ };
double filtered[100];
double fs = 1000.0;
double f_low = 200.0;
double f_high = 800.0;
int n = 100;
butter_bandpass_filter(data, filtered, n, fs, f_low, f_high);
// Print filtered data
int i;
for (i = 0; i < n; i++) {
printf("%f ", filtered[i]);
}
printf("\n");
return 0;
}
```
请注意,此代码仅用于示例目的,可能需要根据您的实际需求进行修改。