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Altera_Forum's avatar
Altera_Forum
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12 years ago

FIR Compiler and FIR feedback filter.

Hello guys, Today I'm trying implementing a FIR feedback in my design with the FIR compiler megafunction. I've created 25 8-bit coefficients and imported them in the FIR compiler tool. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

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you will get delay inside filter(group delay) on top of usual latency as signal builds up.

group delay = 1/2 of filter order

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Thank you kaz !

Probably i was not clear enaugh. My filter is 1-causal. So I don't have to wait the signal to reach the maximum at (n-1)/2. I have only the causal part (eg: only the right half of a gaussian).

The impulse response is like

[0 10 9 8 7 6 5 4 3 2 1 0]

So if my input at k-1 is 10 I expect to have 10 at time k at the output of the filter. But this does not happen and I can't understand why..