将下面的python代码转成高效的C语言代码 for i in range(N): b, a = signal.butter(4, [6.0/(Cfg['Nt'][k]/2), 50.0/(Cfg['Nt'][k]/2)], 'bandpass') Hin[k][i, :] = signal.lfilter(b, a, Hin[k][i, :])

以下是将Python代码转换为C语言代码的示例：

#include <stdlib.h>
#include <stdio.h>
#include <math.h>

void butter(int N, double Wn[], char* type, double b[], double a[]) {
    double c1, c2, c3, c4, c5, c6, c7, c8, c9, c10;
    double d1, d2, d3, d4, d5, d6, d7, d8, d9, d10;
    double ar1, ar2, ai1, ai2;
    double f1, f2, f3, f4, f5, f6, f7, f8, f9, f10;
    double p1, p2, p3, p4, p5, p6, p7, p8, p9, p10;
    double q1, q2, q3, q4, q5, q6, q7, q8, q9, q10;
    double r1, r2, r3, r4, r5, r6, r7, r8, r9, r10;
    double s1, s2, s3, s4, s5, s6, s7, s8, s9, s10;
    double t1, t2, t3, t4, t5, t6, t7, t8, t9, t10;
    double u1, u2, u3, u4, u5, u6, u7, u8, u9, u10;
    double v1, v2, v3, v4, v5, v6, v7, v8, v9, v10;
    double w1, w2, w3, w4, w5, w6, w7, w8, w9, w10;
    double x1, x2, x3, x4, x5, x6, x7, x8, x9, x10;
    double y1, y2, y3, y4, y5, y6, y7, y8, y9, y10;
    double z1, z2, z3, z4, z5, z6, z7, z8, z9, z10;
    double qf1, qf2, qf3, qf4, qf5, qf6, qf7, qf8, qf9, qf10;
    double qb1, qb2, qb3, qb4, qb5, qb6, qb7, qb8, qb9, qb10;
    double af1, af2, af3, af4, af5, af6, af7, af8, af9, af10;
    double ab1, ab2, ab3, ab4, ab5, ab6, ab7, ab8, ab9, ab10;
    double a0, a1, a2, a3, a4, b0, b1, b2, b3, b4;
    double s, c, alpha, beta, gamma, delta;
    double pi = 3.14159265358979323846;
    
    if (strcmp(type, "lowpass") == 0) {
        s = sin(pi*Wn[0]);
        c = cos(pi*Wn[0]);
        alpha = s/(2*N);
        beta = sqrt(1 - alpha*alpha);
        gamma = (1 - c)/2;
        delta = (1 + c)/2;
        
        a0 = delta;
        a1 = gamma + beta*I;
        a2 = alpha*2 - delta;
        a3 = -(gamma + beta*I);
        a4 = delta;
        
        b0 = alpha;
        b1 = 0;
        b2 = -alpha;
        b3 = 0;
        b4 = alpha;
    }
    else if (strcmp(type, "highpass") == 0) {
        s = sin(pi*Wn[0]);
        c = cos(pi*Wn[0]);
        alpha = s/(2*N);
        beta = sqrt(1 - alpha*alpha);
        gamma = (1 + c)/2;
        delta = (1 - c)/2;
        
        a0 = delta;
        a1 = -(gamma + beta*I);
        a2 = alpha*2 - delta;
        a3 = gamma + beta*I;
        a4 = delta;
        
        b0 = alpha;
        b1 = 0;
        b2 = -alpha;
        b3 = 0;
        b4 = alpha;
    }
    else if (strcmp(type, "bandpass") == 0) {
        s = sin(pi*Wn[0]);
        c = cos(pi*Wn[0]);
        alpha = s*sinh(log(2)/2*N*Wn[1]/s);
        beta = sqrt(1 - alpha*alpha);
        gamma = c;
        delta = 1;
        
        a0 = delta;
        a1 = -2*gamma;
        a2 = 2*alpha*beta;
        a3 = 2*gamma;
        a4 = delta;
        
        b0 = alpha;
        b1 = 0;
        b2 = -alpha;
        b3 = 0;
        b4 = alpha;
    }
    else if (strcmp(type, "bandstop") == 0) {
        s = sin(pi*Wn[0]);
        c = cos(pi*Wn[0]);
        alpha = s/sinh(log(2)/2*N*Wn[1]/s);
        beta = sqrt(1 - alpha*alpha);
        gamma = c;
        delta = 1;
        
        a0 = delta;
        a1 = -2*gamma;
        a2 = 2*alpha*beta;
        a3 = 2*gamma;
        a4 = delta;
        
        b0 = beta;
        b1 = -2*beta*c;
        b2 = beta;
        b3 = beta;
        b4 = -2*beta*c;
    }
    else {
        printf("Invalid filter type.\n");
        exit(1);
    }
    
    ar1 = a[0];
    ar2 = a[1];
    ai1 = a[2];
    ai2 = a[3];
    f1 = b[0];
    f2 = b[1];
    f3 = b[2];
    f4 = b[3];
    f5 = b[4];
    p1 = 0;
    p2 = 0;
    p3 = 0;
    p4 = 0;
    p5 = 0;
    q1 = 0;
    q2 = 0;
    q3 = 0;
    q4 = 0;
    q5 = 0;
    r1 = 0;
    r2 = 0;
    r3 = 0;
    r4 = 0;
    r5 = 0;
    s1 = 0;
    s2 = 0;
    s3 = 0;
    s4 = 0;
    s5 = 0;
    t1 = 0;
    t2 = 0;
    t3 = 0;
    t4 = 0;
    t5 = 0;
    u1 = 0;
    u2 = 0;
    u3 = 0;
    u4 = 0;
    u5 = 0;
    v1 = 0;
    v2 = 0;
    v3 = 0;
    v4 = 0;
    v5 = 0;
    w1 = 0;
    w2 = 0;
    w3 = 0;
    w4 = 0;
    w5 = 0;
    x1 = 0;
    x2 = 0;
    x3 = 0;
    x4 = 0;
    x5 = 0;
    y1 = 0;
    y2 = 0;
    y3 = 0;
    y4 = 0;
    y5 = 0;
    z1 = 0;
    z2 = 0;
    z3 = 0;
    z4 = 0;
    z5 = 0;
    qf1 = 0;
    qf2 = 0;
    qf3 = 0;
    qf4 = 0;
    qf5 = 0;
    qb1 = 0;
    qb2 = 0;
    qb3 = 0;
    qb4 = 0;
    qb5 = 0;
    af1 = 0;
    af2 = 0;
    af3 = 0;
    af4 = 0;
    af5 = 0;
    ab1 = 0;
    ab2 = 0;
    ab3 = 0;
    ab4 = 0;
    ab5 = 0;
    
    for (int i = 0; i < N; i++) {
        qf5 = qf4;
        qf4 = qf3;
        qf3 = qf2;
        qf2 = qf1;
        qf1 = Hin[k][i];
        
        qb5 = qb4;
        qb4 = qb3;
        qb3 = qb2;
        qb2 = qb1;
        qb1 = qf5*a0 + qf4*a1 + qf3*a2 + qf2*a3 + qf1*a4 + qb5*b0 + qb4*b1 + qb3*b2 + qb2*b3 + qb1*b4;
        
        af5 = af4;
        af4 = af3;
        af3 = af2;
        af2 = af1;
        af1 = qb5*f1 + qb4*f2 + qb3*f3 + qb2*f4 + qb1*f5;
        
        ab5 = ab4;
        ab4 = ab3;
        ab3 = ab2;
        ab2 = ab1;
        ab1 = qb5*f1 + qb4*f4 + qb3*f3 + qb2*f2 + qb1*f5;
        
        Hin[k][i] = af1 - ab1;
    }
}

然后，您可以使用以下代码调用上面的函数：

int main() {
    double Wn[] = {6.0/(Cfg['Nt'][k]/2), 50.0/(Cfg['Nt'][k]/2)};
    double b[5], a[5];
    int N = ...; // 请用您的代码替换此处的 N
    
    butter(4, Wn, "bandpass", b, a);
    
    return 0;
}