//?LPC.cpp:?implementation?of?the?CLPC?class.
//
//////////////////////////////////////////////////////////////////////

#include?“stdafx.h“
#include?“sndctl.h“
#include?“LPC.h“

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

//////////////////////////////////////////////////////////////////////
//?Construction/Destruction
//////////////////////////////////////////////////////////////////////

CLPC::CLPC（int?*?snddataint?num?）?????//構(gòu)造函數(shù)
{?
	int?i;
	n=num;?????//采樣點(diǎn)的個(gè)數(shù)
????s=snddata;
	N=300;????//每禎點(diǎn)數(shù)
	M=100;????//過渡段長
}

CLPC::~CLPC（）
{
}

float?*?CLPC::GetCoeffa（）
{
	int?ijl;	
	float?R[p+1];???????//p極點(diǎn)個(gè)數(shù)??????//Record?Autocorrelation?values	

	this->preFilter（）;

/////////////////////??為什么要修改N呢？
	int	remainder=n%100;??????//modify?N
	framenum=n/100-2;????//禎的總數(shù)

	int?tmp=remainder/framenum;
	a=new?float[framenum*p+1];
	if（tmp>=1）
	{
		M=100+tmp;??//重新定義每禎的長度
		N=3*M;
	}
//////////////////////
	HammingWnd（）;????????????//compute?w（m）
	finaldata=new?float[N];
	for（i=0;iamenum;i++）?
	{
	????for（j=0;j		{
			finaldata[j]=Hamming[j]*s[i*M+j];????
????????}
		
		for（l=0;l<=p;l++）????//compute?R[p]//12階極點(diǎn)，計(jì)算12階相關(guān)值
		{
			R[l]=0;
			for（j=0;j<=N-1-l;j++）??
		????????R[l]=R[l]+finaldata[j]*finaldata[j+l];
		}		

????????float?E[p+1]k[p+1]alfa[p+1][p+1]result;??????????//Durbin‘s?method?for?computing?ak
		E[0]=R[0];???????
		for（j=1;j<=p;j++）???
		{
			result=0;
			for（l=1;l<=j-1;l++）
				result=result+alfa[l][j-1]*R[（j-l）];
			if（E[j-1]==0）
				E[j-1]=0.001;
????????????k[j]=（R[j]-result）/E[j-1];
			alfa[j][j]=k[j];
			for（l=1;l<=j-1;l++）
				alfa[l][j]=alfa[l][j-1]-k[j]*alfa[j-l][j-1];
			E[j]=（1-k[j]*k[j]）*E[j-1];
			
		}
????????for（j=1;j<=p;j++）????
			a[i*p+j]=alfa[j][p];
	
	}

	delete?[]finaldata;
	return?a;?????//the?values?of?ak?of?each?frame?are?saved?one?by?one?.
}

void?CLPC::HammingWnd（）??//定義窗
{
	int?i;
	for（i=0;i		Hamming[i]=0.54-0.46*cos（2*3.14*i/（N-1））;
}
void?CLPC::preFilter（）??//預(yù)加重
{
	int?i;
	for（i=n-1;i>0;i--）
	{
		s[i]=s[i]-s[i-1]*0.9375;??
	}
	
	
}

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件??????27820??2010-09-18?22:52??語音識(shí)別程序\Debug\BuildLog.htm

?????文件??????13600??2010-09-18?22:52??語音識(shí)別程序\Debug\LPC.obj

?????文件??????????0??2010-09-18?22:52??語音識(shí)別程序\Debug\LPC.sbr

?????文件?????????69??2010-09-18?22:52??語音識(shí)別程序\Debug\mt.dep

?????文件????7793664??2010-09-18?22:52??語音識(shí)別程序\Debug\sndctl.bsc

?????文件??????97280??2010-09-18?22:52??語音識(shí)別程序\Debug\sndctl.exe

?????文件????????920??2010-09-18?22:52??語音識(shí)別程序\Debug\sndctl.exe.embed.manifest

?????文件????????984??2010-09-18?22:52??語音識(shí)別程序\Debug\sndctl.exe.embed.manifest.res

?????文件????????861??2010-09-18?22:52??語音識(shí)別程序\Debug\sndctl.exe.intermediate.manifest

?????文件????1097280??2010-09-18?22:52??語音識(shí)別程序\Debug\sndctl.ilk

?????文件??????22375??2010-09-18?22:52??語音識(shí)別程序\Debug\sndctl.obj

?????文件???28573696??2010-09-18?22:52??語音識(shí)別程序\Debug\sndctl.pch

?????文件????3755008??2010-09-18?22:52??語音識(shí)別程序\Debug\sndctl.pdb

?????文件???????2876??2010-09-18?22:52??語音識(shí)別程序\Debug\sndctl.res

?????文件??????????0??2010-09-18?22:52??語音識(shí)別程序\Debug\sndctl.sbr

?????文件?????106839??2010-09-18?22:52??語音識(shí)別程序\Debug\sndctlDlg.obj

?????文件??????????0??2010-09-18?22:52??語音識(shí)別程序\Debug\sndctlDlg.sbr

?????文件??????????0??2010-09-18?22:46??語音識(shí)別程序\Debug\sou.txt

?????文件??????23934??2010-09-18?22:52??語音識(shí)別程序\Debug\Soundin.obj

?????文件??????????0??2010-09-18?22:52??語音識(shí)別程序\Debug\Soundin.sbr

?????文件?????466107??2010-09-18?22:52??語音識(shí)別程序\Debug\StdAfx.obj

?????文件????3360778??2010-09-18?22:52??語音識(shí)別程序\Debug\StdAfx.sbr

?????文件????1035264??2010-09-18?22:52??語音識(shí)別程序\Debug\vc90.idb

?????文件????2150400??2010-09-18?22:52??語音識(shí)別程序\Debug\vc90.pdb

?????文件?????110644??2004-07-16?00:00??語音識(shí)別程序\DirectIO.dll

?????文件???????3552??2004-07-16?00:00??語音識(shí)別程序\DirectIO.lib

?????文件????????627??2004-07-16?00:00??語音識(shí)別程序\DirectIOLib.h

?????文件????????267??2004-07-16?00:00??語音識(shí)別程序\driver.h

?????文件??????12526??2004-07-16?00:00??語音識(shí)別程序\driver.lib

?????文件???????3168??2004-07-16?00:00??語音識(shí)別程序\DRIVER.SYS

............此處省略105個(gè)文件信息