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HP Filter for PDM mics is poor at reducing 10Hz noise #3

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erk1313 opened this issue Aug 18, 2020 · 0 comments

erk1313 commented Aug 18, 2020 •

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The HP filter on the AIC does work, but it's poor at reducing low frequency noise (<15Hz).

RED: Fc = 10Hz
ORG: Fc = 5000Hz
Note: Plot is with the 60Hz HP prefilter enabled

The register settings do provide the correct cutoff frequency (checked in Matlab) and 1st order roll-off.

Instead, use a software HP filter to cut down this noise.

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