Hi All,
I am trying to ascertain the correct way to name a low pass filter. If I follow the examples as detailed in Robertson and Dowling (reference below), then a single pass filter is a second order, a dual pass is a fourth order, 2 dual passes is an 8th order etc.
However, recent discussions with a colleague have indicated this may not be accurate. My colleague has indicated these are simply second order filters with ‘x’ number of bidirectional passes.
While I have found many texts that provide a description of poles and zeros and patterns of change with different orders and number of bidirectional passes, I cannot find any other references that link the two.
Please can anyone in the group shed any light – and ideally a reference, explaining the correct way to describe filters?
Many thanks
Dan
Robertson, D. G. E., & Dowling, J. J. (2003). Design and responses of Butterworth and critically damped digital filters. Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology, 13(6), 569–73.
I am trying to ascertain the correct way to name a low pass filter. If I follow the examples as detailed in Robertson and Dowling (reference below), then a single pass filter is a second order, a dual pass is a fourth order, 2 dual passes is an 8th order etc.
However, recent discussions with a colleague have indicated this may not be accurate. My colleague has indicated these are simply second order filters with ‘x’ number of bidirectional passes.
While I have found many texts that provide a description of poles and zeros and patterns of change with different orders and number of bidirectional passes, I cannot find any other references that link the two.
Please can anyone in the group shed any light – and ideally a reference, explaining the correct way to describe filters?
Many thanks
Dan
Robertson, D. G. E., & Dowling, J. J. (2003). Design and responses of Butterworth and critically damped digital filters. Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology, 13(6), 569–73.
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