c6_4_1.c

DSP应用开发实用子程序 本书从工程应用的角度出发

#include <stdio.h>
#include <math.h>
//#include <C55.h>

#define BUFFERSIZEOUT    254
#define BUFFERSIZEIN      4064

#define DeltaMax            1280        	
#define DeltaMin            6.5
#define Beta                0.99          	

#define ORD               6   			
#define MAX_BITS         16 

double ValPreCVSD = 0;
double DeltaCVSD = 20;				
double Delta0CVSD = 10;				
char ThreeJudgeCVSD[3] = {0,1,0};
double ValPreCVSDDE = 0;
double DeltaCVSDDE = 20;			
double Delta0CVSDDE = 10;			
char ThreeJudgeCVSDDE[3] = {0,1,0};

static double CoefA[ORD] = {1.00000000,-3.88893329, 6.64074495,-6.08600100, 2.98673653,-0.62768820};
static double CoefB[ORD] = {0.03285030,-0.05723916, 0.03681835, 0.03681835,-0.05723916, 0.03285030};

static short filterY[ORD-1];
static short filterX[ORD];
char CVSDCoder(short InData);
short CVSDDecoder(char InData);

char CVSDCoder(short InData)				
{	
	double Diff = 0;	
	int j = 0;
	char OutData;
	Diff = InData - ValPreCVSD;
		
	if (Diff > 0)
	{
	    ThreeJudgeCVSD[j] = 1;
	    OutData = 1;
	}
	
	else
	{
		ThreeJudgeCVSD[j] = 0;
		OutData = 0;
	}                					   					//