Phase shift after filtering

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Christian Weich
Christian Weich 2017-4-28
回答： Star Strider 2017-4-28
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

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回答（1 个）

Star Strider
Star Strider 2017-4-28
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.)

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