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// nonrec.cpp -- non-recursive filter design
// NRLowPass() build NR low-pass filter
// NRHighPass() build NR high-pass filter
// NRBandPass() build NR band-pass filter
#include "tools.h"
#include "ltisys.h"
// sinc() or sin(x)/x function
double sinc(double x)
{
if (x==0)
return cos(x);
else
return sin(x)/x;
}
// Create non-recursive low-pass filter by Fourier Transform method
LTISystem NRLowPass(
double freq, // corner freq (fraction of sampling rate)
int ncoeff // # coefficients
) // returns LTI system to specification
{
int i;
// convert frequency
double omega = 2 * PI * freq;
// build half-sized window from sinc function
int nhalf = ncoeff/2;
Waveform hwv(nhalf,1.0);
for (i=1;i<=nhalf;i++)
hwv[i] = omega * sinc(i*omega)/PI;
// window with (half-)hamming window
for (i=1;i<=nhalf;i++)
hwv[i] *= 0.54 + 0.46 * cos(i*PI/nhalf);
// create new LTI System
LTISystem lpfilt(2*nhalf,0);
// copy impulse response into system
// (indexed -nhalf .. 0 .. nhalf)
lpfilt.a[nhalf] = omega/PI;
for (i=1;i<=nhalf;i++) {
lpfilt.a[nhalf-i] = hwv[i];
lpfilt.a[nhalf+i] = hwv[i];
}
return lpfilt;
}
// create high-pass non-recursive filter from low-pass prototype
LTISystem NRHighPass(
double freq, // corner freq (fraction of sampling rate)
int ncoeff // # coefficients
) // returns LTI system
{
// get low-pass version
LTISystem hpfilt = NRLowPass(0.5-freq,ncoeff);
// now modulate with cos(n*PI) = +1,-1,+1,-1,...
int nhalf = hpfilt.a.count()/2;
for (int i=1;i<=nhalf;i+=2) {
hpfilt.a[nhalf-i] = -hpfilt.a[nhalf-i];
hpfilt.a[nhalf+i] = -hpfilt.a[nhalf+i];
}
return hpfilt;
}
// create band-pass non-recursive filter from low-pass prototype
LTISystem NRBandPass(
double lofreq, // low corner freq (fraction of sampling rate)
double hifreq, // high corner freq (fraction of sampling rate) }
int ncoeff // # coefficients
) // returns LTI system
{
// get low-pass prototype
LTISystem bpfilt = NRLowPass((hifreq-lofreq)/2,ncoeff);
// now modulate with cos(n*centrefreq)
int nhalf = bpfilt.a.count()/2;
double cf = 2*PI*(lofreq+hifreq)/2;
bpfilt.a[nhalf] = 2 * bpfilt.a[nhalf];
for (int i=1;i<=nhalf;i++) {
bpfilt.a[nhalf-i] = 2 * bpfilt.a[nhalf-i] * cos(i*cf);
bpfilt.a[nhalf+i] = 2 * bpfilt.a[nhalf+i] * cos(i*cf);
}
return bpfilt;
}
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Perhaps it would help if you told us what's going wrong!
Steve
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The results matched against the requirements. 
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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CPallini wrote: The results matched against the requirements.
You really tested it?! 
Maxwell Chen
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Nope. I just suggested the OP the results matched against the requirements will tell what the error is.
Since we don't know both the results and the requirements, we have no chance to.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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Well, as there weren't any requirements mentioned... It exceeded all expectations!
Iain.
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Did you forget the CPMRU (Code Project Mind Reader Unit)?
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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Actually the coding is to design a low pass filter to remove ecg signal noise..the coding was given my lecture for the project..when I tried to run it i got this error. ‘fatal error C1083: Cannot open include file: 'tools.h': No such file or directory’
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You should add the tools.h file folder to the Include Directories list of Visual Studio.
(Tools->Options menu item, then Project and Solutions->VC++ Directories node, then Include files item of Show Directories for listbox).
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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sir i followed as you said but im still getting the same error.
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Do you included it using double quotes, i.e. with #include "tools.h"?
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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yes sir..still getting the same error
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ashwiny wrote: #include "tools.h"
If you right-click this statement, can you open the tools.h file?
"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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i have tried but cannot sir
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Then that's your clue that the IDE has no idea how to find that file. What version of VS are you using?
"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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On the Options dialog, click the Directories tab. Is the directory that contains the tools.h file listed there?
"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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What happens if you change the #include statement so that it contains an absolute path to the tools.h file?
"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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i dont get you sir..how to change it?
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Change the #include statement to also include the absolute path to the tools.h file, like:
#include "c:/some_path/tools.h" As it currently stands, you are using a relative path.
"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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While ask this species questions we prefer to shown only debug window's result will be very easy way to find a solution.
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im getting the same error..fatal error C1083: Cannot open include file: 'tools.h': No such file or directory
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I have a view whic is derived from CView
on top of that view i have a tree controls which is derived from CtreeCtrl
now i wanna make the background of the tree control with gradient
i know how to paint gradient color
now please let me know where to write the gradient code ?
in View which is derived from Cview? -- seems its not working coz on top of this view Tree ctrl is sitting?
then shud i place the code onPaint() of CTreeCtrl? - tried and its not working as u can see only color but not tree nodes
then shud i place it OnEraseBkgnd?
please let me know
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