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Altera_Forum's avatar
Altera_Forum
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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

According to this equation :

i=[0:i-1];

x= (i-1)*sin ((pi/2)*i/i-1)+ 1/2*(i-1));

The result that I got is not the sine wave shape (the LUT values inverted in minus when it pass the half of (pi/2) range ). herewith the attached sine wave file