digitalfilter.cpp

利用intel dsplib 库函数进行特定2FSK信号（需传导频）解调

// DigitalFilter.cpp: implementation of the CDigitalFilter class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "VTDecode.h"
#include "DigitalFilter.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CDigitalFilter::CDigitalFilter()
{

}

CDigitalFilter::~CDigitalFilter()
{

}


void CDigitalFilter::BandpassFilter0Init(double LowFre,double UpFre,double SampleFre)
{
	double dLFre,dUFre,dTaps[128];
	int iFeedBack;

	dLFre=LowFre/SampleFre;
	dUFre=UpFre/SampleFre;
	iFeedBack=nspdFirBandpass(dLFre,dUFre,dTaps,128,NSP_WinHann,0);
	if(iFeedBack!=NSP_StsOk)
	{
		exit(0);
	}

	nspdFirInit(dTaps,128,NULL,&nspFirstate0);
}

void CDigitalFilter::BandpassFilter1Init(double LowFre,double UpFre,double SampleFre)
{
	double dLFre,dUFre,dTaps[128];
	int iFeedBack;

	dLFre=LowFre/SampleFre;
	dUFre=UpFre/SampleFre;
	iFeedBack=nspdFirBandpass(dLFre,dUFre,dTaps,128,NSP_WinHann,0);
	if(iFeedBack!=NSP_StsOk)
	{
		exit(0);
	}

	nspdFirInit(dTaps,128,NULL,&nspFirstate1);
}

void CDigitalFilter::BandpassFilter2Init(double LowFre,double UpFre,double SampleFre)
{
	double dLFre,dUFre,dTaps[128];
	int iFeedBack;

	dLFre=LowFre/SampleFre;
	dUFre=UpFre/SampleFre;
	iFeedBack=nspdFirBandpass(dLFre,dUFre,dTaps,128,NSP_WinHann,0);
	if(iFeedBack!=NSP_StsOk)
	{
		exit(0);
	}

	nspdFirInit(dTaps,128,NULL,&nspFirstate2);
}


void CDigitalFilter::BandpassFilter0(double *InputData,double *OutputData,int ItemNumber)
{
	nspdbFir(&nspFirstate0,InputData,OutputData,ItemNumber);
}


void CDigitalFilter::BandpassFilter1(double *InputData,double *OutputData,int ItemNumber)
{
	nspdbFir(&nspFirstate1,InputData,OutputData,ItemNumber);
}


void CDigitalFilter::BandpassFilter2(double *InputData,double *OutputData,int ItemNumber)
{
	nspdbFir(&nspFirstate2,InputData,OutputData,ItemNumber);
}



void CDigitalFilter::Filter0Free()
{
	nspFirFree(&nspFirstate0);
}


void CDigitalFilter::Filter1Free()
{
	nspFirFree(&nspFirstate1);
}

void CDigitalFilter::Filter2Free()
{
	nspFirFree(&nspFirstate2);
}