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4 order CIC filter sidelobe attenuation wrong

Open jordens opened this issue 4 years ago • 1 comments

4*13.3 dB = 53.2 dB not 66.3 dB

Both in the text and in the figure:

image

(real-world data at https://github.com/quartiq/fastino/issues/5 for example ;-)

jordens avatar Oct 28 '21 16:10 jordens

I also noticed this, had to check my calculations and I get the first sidelobe at around -52 dB, -53 dB (numerically finding the max magnitude value above the first notch). But it shouldn't be -66.3 dB.

ronnyandersson avatar Jun 14 '22 15:06 ronnyandersson