Using sinc() in a filter desing

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Danijel
Danijel il 20 Mar 2018
Commentato: MUHAMMAD ZAKI il 2 Feb 2021
In order to design a filter (windowing method), I first generate my sinc function like so:
L = 20;
fc = 0.25;
n = (1:L)';
my_sinc = sin(2*pi*fc*(n-L/2)) ./ (pi*(n-L/2));
my_sinc(L/2) = 2*fc;
Then I apply window:
win = blackman(L, 'symmetric');
filter_coeffs = (my_sinc .* win);
Can the first step be done using Matlab builtin sinc()?

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Danijel
Danijel il 20 Mar 2018
This works:
2*fc * sinc(2*fc*(n-L/2))
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MUHAMMAD ZAKI
MUHAMMAD ZAKI il 2 Feb 2021
Hi, For the line my_sinc(L/2)=2*fc above, we don't need to use right?

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