Tympan / Tympan_Sandbox

Working Files
2 stars 2 forks source link

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

Open erk1313 opened 4 years ago

erk1313 commented 4 years ago

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.