?? signal.c
字號(hào):
/*
signal.c - Sinewave plus additive zero-mean random noise
*/
#define USE_DATA 1
#if USE_DATA /* Use noise data file */
#pragma CODE_SECTION(cos_rand, "lms_code");
#pragma DATA_SECTION(noise, "lms_data");
#pragma DATA_SECTION(i, "lms_data");
#include "noise.dat"
static unsigned int i=0;
void cos_rand(int *x, unsigned int Ns)
{
unsigned int t;
for (t=Ns; t>0; t--)
{
*x++ = noise[i];
i++;
if (i == 10000)
i = 0;
}
}
#else /* Generate noise samples */
#include <math.h>
#include <intrindefs.h>
#pragma CODE_SECTION(cos_rand, "lms_code");
#pragma DATA_SECTION(i, "lms_data");
#define PI 3.1415962
#define K (Ns>>6)
#define a1 0x4000
#define a2 0x4000
static unsigned int i=0;
void cos_rand(int *x, unsigned int Ns)
{
unsigned int t;
float two_pi_K_Ns;
int temp;
long ltemp;
two_pi_K_Ns=2.0*PI*K/Ns;
for (t=Ns; t>0; t--)
{
temp = (int)(0x7fff*cos(two_pi_K_Ns*i));
ltemp = _lsmpy(a1,temp);
temp = rand(0x228)-0x4000;
*x++ = _smac(ltemp,a2,temp)>>16;
i++;
i%=(Ns>>1);
}
}
#endif
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