How to calculate the filter order of given specification ??
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afef
el 7 de Jul. de 2017
Comentada: afef
el 19 de Ag. de 2017
Hi, i designed a filter using :
d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'PassbandRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
When i tried to use fdatool to get the filter coefficient i need to put the filter order but i don't know how to calculate it . can anyone tell me please?
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Star Strider
el 7 de Jul. de 2017
There is a way to calculate the order necessary for IIR filters, since they have both numerator and denominator polynomials, but not for FIR filters, with only numerator polynomials. With FIR filters, I usually begin with a filter order of 24, then use freqz to test it, and increase the length until I get the result I want. The window you choose will affect the filter passband shape.
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Star Strider
el 19 de Ag. de 2017
The only problem are the (possible) filter transients at the beginning and end of each segment. These are more apparent with longer filters.
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