Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

the quarter sine LUT code

Dear all I need to get the quarter sine LUT in DDFS (Herewith the MATLAB code that I used) i=[0:i-1]; x= (i-1)*sin ((pi/2)*i/31));
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

There is some error in your sine values but almost correct.

Try this:

x = round(255*sin(2*pi*(0:1023)/1024));

x = x(1:256);

You should get proper quarter sine from x otherwise tell us what you do with x.

you can also just use:

x = round(255*sin(2*pi*(0:255)/1024));