Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
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

If you indeed wanted to go for decimation then a decimation polyphase structure will reduce multipliers by decimation factor. Using cascaded halfband is an overkill.

However, I feel an IIR filter is best option provided phase linearity is not a problem and provided the maximum delay in the band of interest is kept minimum.