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Altera_Forum's avatar
Altera_Forum
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17 years ago

Question about FIR filter outputs

Hi, I designed FIR filter and I try to undestand why the number of output samples is different from the input? It lacks 2-3 samples. Thank you for your help.
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

I don't use fir compilers or simulink. I guess your enable signal doesn't go high until after few clks.

I don't think you should worry about it if that is the case. In many designs we don't care about startup functionality as long as things will soon settle.

Check the filtering itself. apply fft in Matlab to your output/input and see the response and check if it matches the function freqz(taps)