A general solution for the time delay introduced by a low-pass Butterworth digital filter: An application to musculoskeletal modeling.
Low-pass Butterworth digital filters are commonly used in biomechanics-related research. In general, the input signal is filtered in the forward and reverse directions so that a temporal shift in the output signal does not occur. There are times, however, when introducing a specific time delay is an important consideration when modeling a physiological event. Filtering the data in the forward direction only can be used as an efficient method to account for a specific time delay. Specific delays are possible by carefully selecting the filter order and cut-off frequency. The purpose of this paper is to present the analytical formulation of a general solution for the time delay introduced by a low-pass Butterworth digital filter.
Manal
Kurt
K
126 Spencer Laboratory, Center for Biomedical Engineering Research, University of Delaware, Newark, DE 19716, USA. manal@udel.edu
Rose
William
W
D001696:Biomechanical Phenomena; D055592:Biophysical Phenomena; D001703:Biophysics; D008954:Models, Biological; D009142:Musculoskeletal Physiological Phenomena; D009141:Musculoskeletal System / Q000033:anatomy & histology*