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/****************************************************************************
DRC: Digital Room Correction
Copyright (C) 2002, 2003 Denis Sbragion
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
You can contact the author on Internet at the following address:
d.sbragion@infotecna.it
****************************************************************************/
/****************************************************************************
Progetto : DSP Library.
File : DSPWind.cpp
Autore : Sbragion Denis
Descrizione : Funzioni per vari tipi di finestratura.
Revisioni :
16/10/93 : Prima stesura.
****************************************************************************/
#include "dspwind.h"
#include <stdio.h>
/* Memory leaks debugger */
#ifdef DebugMLeaks
#include "debug_new.h"
#endif
void HammingWindow(DLReal * A,unsigned int Size)
{
unsigned int I,Half = Size/2;
DLReal C;
for(I = 0;I < Half;I++)
{
C = (DLReal) (0.54-0.46*DLCos(2*M_PI*I/(Size-1)));
A[I] *= C;
A[Size-I-1] *= C;
}
}
void HanningWindow(DLReal * A,unsigned int Size)
{
unsigned int I,Half = Size/2;
DLReal C;
for(I = 0;I < Half;I++)
{
C = (DLReal) (0.5*(1-DLCos(2*M_PI*I/(Size-1))));
A[I] *= C;
A[Size-I-1] *= C;
}
}
void BlackmanWindow(DLReal * A,unsigned int Size)
{
unsigned int I,J;
unsigned int Half = Size/2;
DLReal C;
DLReal C1 = (DLReal) (2*M_PI/(Size-1));
DLReal C2 = (DLReal) (4*M_PI/(Size-1));
for(I = 0,J = Size - 1;I < Half;I++,J--)
{
C = (DLReal) (((DLReal) 0.42)-((DLReal) 0.5)*DLCos(C1*I)+((DLReal) 0.08)*DLCos(C2*I));
A[I] *= C;
A[J] *= C;
}
}
void SpacedBlackmanWindow(DLReal * A,unsigned int Size, unsigned int Space, WindowType WType)
{
unsigned int ESize = Size - Space;
unsigned int I,Half = (ESize) / 2;
DLReal C;
DLReal C1 = 2*M_PI/(ESize-1);
DLReal C2 = 4*M_PI/(ESize-1);
switch (WType)
{
case WRight:
for(I = 0;I < Half;I++)
{
C = (DLReal) (0.42-0.5*DLCos(C1*I)+0.08*DLCos(C2*I));
A[Size-I-1] *= C;
}
break;
case WFull:
for(I = 0;I < Half;I++)
{
C = (DLReal) (0.42-0.5*DLCos(C1*I)+0.08*DLCos(C2*I));
A[I] *= C;
A[Size-I-1] *= C;
}
break;
case WLeft:
for(I = 0;I < Half;I++)
{
C = (DLReal) (0.42-0.5*DLCos(C1*I)+0.08*DLCos(C2*I));
A[I] *= C;
}
break;
}
}
void HalfBlackmanWindow(DLReal * A,unsigned int Size, unsigned int Space, WindowType WType)
{
unsigned int ESize = Size - Space;
unsigned int I;
DLReal C;
DLReal C1 = M_PI/(ESize-1);
DLReal C2 = 2*M_PI/(ESize-1);
switch (WType)
{
case WRight:
for(I = 0;I < ESize;I++)
{
C = (DLReal) (0.42-0.5*DLCos(C1*I)+0.08*DLCos(C2*I));
A[Size-I-1] *= C;
}
break;
case WFull:
perror("dspwind.cpp.HalfBlackmanWindow: WFull not supported");
break;
case WLeft:
for(I = 0;I < ESize;I++)
{
C = (DLReal) (0.42-0.5*DLCos(C1*I)+0.08*DLCos(C2*I));
A[I] *= C;
}
break;
}
}
void BartlettWindow(DLReal * A,unsigned int Size)
{
unsigned int I,Half = Size/2;
DLReal C,R = ((DLReal) Size-1)/2;
for(I = 0;I < Half;I++)
{
C = I/R;
A[I] *= C;
A[Size-I-1] *= C;
}
}
void BlackmanHarrisWindow(DLReal * A,unsigned int Size)
{
unsigned int I,Half = Size/2;
DLReal C;
for(I = 0;I < Half;I++)
{
C = (DLReal) (0.35875-0.48829*DLCos(2*M_PI*I/(Size-1))+0.14128*DLCos(4*M_PI*I/(Size-1))+0.01168*DLCos(6*M_PI*I/(Size-1)));
A[I] *= C;
A[Size-I-1] *= C;
}
}
void ExponentialWindow(DLReal * A,unsigned int Size,DLReal P)
{
unsigned int I,Half = Size/2;
DLReal C,X;
P = (DLReal) (sqrt(P));
for(I = 0;I < Half;I++)
{
X = (P*(Half-I))/Half;
C = (DLReal) (exp(-X*X));
A[I] *= C;
A[Size-I-1] *= C;
}
}
void Ones(DLReal * A,unsigned int Size)
{
unsigned int I;
for(I = 0;I < Size;I++)
A[I] = 1;
}
/***************************************************************************/
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