Using sinc() in a filter desing

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()?

Answer 1

[Danijel]

This works:

2*fc * sinc(2*fc*(n-L/2))

[MUHAMMAD ZAKI]

Hi, For the line my_sinc(L/2)=2*fc above, we don't need to use right?