FIR滤波器的C语言实现
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2009-04-22
10:28:27
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FIR 滤波器的 C 语言实现
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1
void fir(short x[], short h[], short y[])
{
int i, j, sum;for (j = 0; j < 100; j++) {
sum = 0;
for (i = 0; i < 32; i++)
sum += x[i+j] * h[i];
y[j] = sum >> 15;
}
}
2
void fir(short x[], short h[], short y[])
{
int i, j, sum0, sum1;
short x0,x1,h0,h1;for (j = 0; j < 100; j+=2) {
sum0 = 0;
sum1 = 0;
x0 = x[j];
for (i = 0; i < 32; i+=2){
x1 = x[j+i+1];
h0 = h[i];
sum0 += x0 * h0;
sum1 += x1 * h0;
x0 = x[j+i+2];
h1 = h[i+1];
sum0 += x1 * h1;
sum1 += x0 * h1;
}
y[j] = sum0 >> 15;
y[j+1] = sum1 >> 15;
}
}
3
void fir(short x[], short h[], short y[])
{
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