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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

Many thanks to both of you

Sure, filters always introduce delay, but sometimes the delay can be cancelled in offline data processing.

Here I just hope to design a filter with small delay. As suggested by FvM, I tried Bessel. The results show the delay is a little smaller than that of Elliptic filters.

Maybe 20ms is smallest delay of a direct-designed filter in this case.