#include
#include
#include
#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]={010};
double??ValPreCVSDDE=0;
double??DeltaCVSDDE=20;
double?Delta0CVSDDE=10;
char??ThreeJudgeCVSDDE[3]={010};

static??double?CoefA[ORD]={1.00000000-3.888933296.64074495
-6.086001002.98673653-0.62768820};
static??double?CoefB[ORD]={0.03285030-0.057239160.03681835
0.03681835-0.057239160.03285030}?;
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;
}	?????????????????
if?（（（ThreeJudgeCVSD[0]==1）&（ThreeJudgeCVSD[1]==1）&（ThreeJudgeCVSD[2]==1））|
??????（ThreeJudgeCVSD[0]==0）&?（ThreeJudgeCVSD[1]==0）&（ThreeJudgeCVSD[1]==1）））
?????????
	?							???DeltaCVSD=DeltaCVSD+Delta0CVSD;
else							???DeltaCVSD=Beta*DeltaCVSD;
if（DeltaCVSD>DeltaMax）?????????????	DeltaCVSD=DeltaMax;
if（DeltaCVSD

if（ThreeJudgeCVSD[j]==1）
{
?????ValPreCVSD=ValPreCVSD+DeltaCVSD;
}

if（ThreeJudgeCVS