//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop
#include <math.h>
#include "Main.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
#define PI 3.1415926
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{

}
//---------------------------------------------------------------------------
void TForm1::AutoCoreFilter()
{

	int i,j,n1,j1;
	float *r1=new float[m_lSignalLength+6];
	for (i=0;i<m_lSignalLength;i++)
	{
        r1[i] = 0.0;
		n1=m_lSignalLength-i;
		for (j=1;j<=n1;j++)
		{
			j1=i+j;
			r1[i]=r1[i]+m_pfSourceSignal[j-1]*m_pfSourceSignal[j1-1];
		}
		r1[i]=r1[i]/n1;//(n1+1);
	}

	for (i=0;i<m_lSignalLength;i++)
	{
		m_pfSourceSignal[i]=r1[i];  //原來是倒序排列，現(xiàn)在改為正序排列
	}

	delete [] r1;
    /*float *temp = new float[m_lSignalLength];
    memcpy(temp,m_pfSourceSignal,m_lSignalLength*sizeof(float));
    delete [] temp;    */
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    m_pfSourceSignal = new float[1024];
    m_lSignalLength = 1024;
    for(int i=0;i<1024;i++)
    {
        m_pfSourceSignal[i] = sin(i*8*PI/1024  );
    }
    for(int j=0;j<1024;j++)
    {
        Series1->AddXY(j,m_pfSourceSignal[j],clGreen);
    }
    AutoCoreFilter();
    for(int k=0;k<1024;k++)
    {
        Series2->AddXY(k,m_pfSourceSignal[k],clGreen);
    }
    delete []m_pfSourceSignal;
}
//---------------------------------------------------------------------------