Phase shift after filtering

Hallo Community! I collected acceleration data with 300Hz and filtered them using a cutoff of 4.5Hz. As a result I get my filtered data but slighly shifted (see attached file).

Does anyone have an idea how to deal with this problem?

Thank you and have a nice weekend

Christian

Answer 1

[Star Strider]

Use the Signal Processing Toolbox filtfilt function rather than the filter function. The filtfilt function has a maximally-flat phase response for all filters, regardless of design, so there is no phase distortion. (The hardware or continuous-time maximally-flat phase Bessel filter cannot be realised as a discrete filter.)