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Altera_Forum's avatar
Altera_Forum
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13 years ago

fir filter code in vhdl [plzzzzzz reply as fast as possible plzzzz]

I have attached a file . this is my code for 4tap fir filter.but there is a problem.the o/p i get is not getting verified with the formula of fir.y(n)=h(n)*x(n) plzzzzz help me. plzz help!!!!! ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

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If you are only simulating(functional) then don't worry about adding registers. In all cases don't put any registers between adders as this will affect fir function. I advise you go back to first code. It is ok, you are not testing correctly. Show me few samples of your input and output.

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thnx for the reply and cooperation sir

my h=[-2 -1 3 4]

im giving inputs x=[0 -3 1 0 ]

i shud get y=[0 6 1 -10 ]

according to fir formula y0=x0h0, y1=x0h1+x1h0, y2=x0h2+x1h1+x2h0 , y3=x0h3+x1h2+x2h1+x3h0

but when i simulate my code im getting y=[0 6 0 4] y0,y1 are correct.

plzz reply me fast sir.......