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Altera_Forum
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8 years ago

Estimation IIR filter resources

Hi, In my application I will need implement high order (4), IIR, Butterworth, Low Pass filter, with cutoff frequency (-3dB) of ~1Hz and stop band of ~10Hz, with attenuation of -80dB. The input si...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

@FvM,

Thank you, and good catch. I had thought the stopband cutoff was 10kHz, not 10Hz, and so my numbers were all off. You could still do this with a nice polyphase technique and probably less than 8 multiplies or so, but that would be a more difficult filter for a beginner to build.

Dan