g722main.c

dsp AD公司ADSP21的代码,里面有FFT FIR IIR EQULIZER G722_21F 等可以在项目中直接应用的代码.此代码的来源是ADI公司自己出版的书籍,此书在美国购得

#include <stdlib.h>
#include "rtdspc.h"

/* Main program for g722 encode and decode demo for 210X0 */

    extern int encode(int,int);
    extern void decode(int);
    extern void reset();

/* outputs of the decode function */
    extern int xout1,xout2;

    int chkl_coded[6000];
    extern int pm chkl[];

void main()
{
    int i,j,t1,t2;
    float xf1 = 0.0;
    float xf2 = 0.0;

/* reset, initialize required memory */
    reset();

/* code the speech, interpolate because it was recorded at 8000 Hz */
    for(i = 0 ; i < 6000 ; i++) {
        t1=64*chkl[i];
        t2=32*(chkl[i]+chkl[i+1]);
        chkl_coded[i]=encode(t1,t2);
    }

/* interpolate output to 32 KHz */
    for(i = 0 ; i < 6000 ; i++) {
        decode(chkl_coded[i]);
        xf1 = (float)xout1;
        sendout(0.5*xf2+0.5*xf1);
        sendout(xf1);
        xf2 = (float)xout2;
        sendout(0.5*xf2+0.5*xf1);
        sendout(xf2);
    }

/* simulate a 16 KHz sampling rate (actual is 32 KHz) */
/* note: the g722 standard calls for 16 KHz for voice operation */
    while(1) {
        t1=0.5*(getinput()+getinput());
        t2=0.5*(getinput()+getinput());

        j=encode(t1,t2);
        decode(j);

        xf1 = (float)xout1;
        sendout(0.5*(xf1+xf2));
        sendout(xf1);
        xf2 = (float)xout2;
        sendout(0.5*(xf2+xf1));
        sendout(xf2);
    }
}