Filters - time domain

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Bran 2016-7-11

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评论： Star Strider 2016-7-11

I would like to use a filter to re-position parts of a signal so that they oscillate around zero. My signal has a mixture of parts that are correct and those that are off by a certain amount. Can you suggest the best filter to do this as I would like to keep my signal in the time - domain

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Answer 1

Star Strider 2016-7-11

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If I understand you Question correctly, a high-pass filter that filters out the lowest frequencies (including the d-c offset) will work. If you have high-frequency noise, a bandpass filter would be best.

There are several ways to design filters in MATLAB, including dfilt and designfilt. My filter design procedure is here: How to design a lowpass filter for ocean wave data in Matlab?

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Bran 2016-7-11

Thank you very much for your response. Will this work considering the DC offset is only there for very small parts of the signal?

Star Strider 2016-7-11

My pleasure.

A d-c offset will be present for the entire length of the signal. If you have a varying baseline, you will need to use a bandpass filter to pass only your frequencies of interest, eliminating the low-frequency baseline variation.

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