10-29-2005, 05:37 PM
Dear members:
In the demo in my class, my prof uses matlab to design a digital
butterworth filter. He first designs an analog filter using funtion
butter(, , 's') and then uses bilinear transformation to convert the
analog filter to a digital filter.
Since I know MATLAB function butter()allows us to directly design a
digital butterworth filter, I am wondering what are the advantages of
my prof's method over the direct design method?
I am wondering if prof uses this method just to show how to design an
digital filter from an analog filter, and in practical cases, we can
use the MALAB butter to directly design digital filters, don't need to
use he bilinear transformation method. The result is the same.
Plz confirm my thinking.
Thanks
In the demo in my class, my prof uses matlab to design a digital
butterworth filter. He first designs an analog filter using funtion
butter(, , 's') and then uses bilinear transformation to convert the
analog filter to a digital filter.
Since I know MATLAB function butter()allows us to directly design a
digital butterworth filter, I am wondering what are the advantages of
my prof's method over the direct design method?
I am wondering if prof uses this method just to show how to design an
digital filter from an analog filter, and in practical cases, we can
use the MALAB butter to directly design digital filters, don't need to
use he bilinear transformation method. The result is the same.
Plz confirm my thinking.
Thanks