ref: 012ae34cae3f152370a7c58602d8cbb841cd8aad
dir: /amr-wb/convolve.c/
/*------------------------------------------------------------------------*
* CONVOLVE.C *
*------------------------------------------------------------------------*
* Perform the convolution between two vectors x[] and h[] and *
* write the result in the vector y[]. *
* All vectors are of length L. *
*------------------------------------------------------------------------*/
#include "typedef.h"
#include "basic_op.h"
#include "count.h"
void Convolve(
Word16 x[], /* (i) : input vector */
Word16 h[], /* (i) Q15 : impulse response */
Word16 y[], /* (o) 12 bits: output vector */
Word16 L /* (i) : vector size */
)
{
Word16 i, n;
Word32 L_sum;
for (n = 0; n < L; n++)
{
L_sum = 0L; move32();
for (i = 0; i <= n; i++)
L_sum = L_mac(L_sum, x[i], h[n - i]);
y[n] = round(L_sum); move16();
}
return;
}