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Altera_Forum's avatar
Altera_Forum
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15 years ago

how to design a low pass digital filter with smallest delay

Hello, All I want to design a digital filter with the cutoff frequency 20Hz. The sampling frequency of my acquiring system is very high, up to 8192 Hz. The important requirement is the de...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

in this case you can do a down sample by 256 (try a whole series of half band filters too). i designed a filter with a transition band of 1/1000 of the sample rate (1 dB in band ripple, 100 dB stop band attenuation) and couldn't decimate (the passband was just over the quarter sample rate). it was a challenge