FPGA Central

Hi,

I came across this the other day,

for i=0:1:2*hLen
sinc(i-hLen) * pow(cos(PI*(i-hLen)/(2*hLen)),beta);

I know it is a windowed sinc, but what is the window function being
used? the pow() part.

Thanks
syl

On Nov 7, 9:36 am, SYL <[email protected]> wrote:
> Hi,
>
> I came across this the other day,
>
> for i=0:1:2*hLen
> sinc(i-hLen) * pow(cos(PI*(i-hLen)/(2*hLen)),beta);
>
> I know it is a windowed sinc, but what is the window function being
> used? the pow() part.
>
> Thanks
> syl

This window sometimes appears in the literature as the 'cosine-lobe'
or 'cosine-bell' window. So that would become: 'cosine-lobe to a
power' in your expression. However there are people who use these
terms for some of the 'raised cosine' windows so you have to be
careful. Also, the equivalent window over the region 0 to pi is the
'sine-lobe' window where powers of 1 and 3 seem most common.

Dale B. Dalrymple
http://dbdimages.com
http;//stores/lulu/com/dbd