Construction of a High-Pass Digital Filter from a Low-Pass Digital Filter

in Journal of Applied Biomechanics

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Stephen D. Murphy
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D. Gordon E. Robertson
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To remove low-frequency noise from data such as DC-bias from electromyo-grams (EMGs) or drift from force transducers, a high-pass filter was constructed from a low-pass filter of known characteristics. A summary of the necessary steps required to transform the low-pass digital were developed. Contaminated EMG and force platform data were used to test the filter. The high-pass filter successfully removed the low-frequency noise from the EMG signals. The high-pass filter was then cascaded with the low-pass filter to produce a band-pass filter to enable simultaneous high- and low-frequency noise reduction.

Stephen D. Murphy and D. Gordon E. Robertson are with the School of Human Kinetics, University of Ottawa, Ottawa, ON Canada KIN 6N5.

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