Re: Windowed-sinc function

Michel Rouzic wrote: 
I read chapter 16 from dspguide.com, and from that I did a
windowed-sinc function, calculated by this :

for (i=0; i<*M/2; i++)
{
	h[i]=sin(2*pi*fc*(i-*M/2))/(i-*M/2);
	h[*M-i-1]=h[i];
}
h[*M/2]=2*pi*fc;

the problem is, the central bin (h[*M/2]) seems to be a little less
than a billion times too big compared to the rest of the kernel, and
then, the rest of the kernel doesn't seem to have the right shape for a
low-pass FIR filter kernel. see anything that ain't right about it?

btw, here, pi=atan(1.0)*4.0, fc is the cutoff frequency expressed as a
fraction of the sampling frequency, and *M is the length of the kernel
to be generated, an always is an odd number.


Look to your indexing. Is there a divide-by-almost-zero problem?

Jerry
--
Engineering is the art of making what you want from things you can get.
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.

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