[SciPy-Dev] Algorithm for butterworth filter implementation

Sturla Molden sturla@molden...
Sun Jul 22 07:34:27 CDT 2012


You probably did the common mistake of assuming an N-order LP followed by an N-order HP produces an N-order BP. That is not an algorithmic issue.

Sturla



Den 21. juli 2012 kl. 23:33 skrev Bogdan Cristea <cristeab@gmail.com>:

> Hi
> 
> Could someone provide me with some hints about the algorithm used to compute 
> the coefficients for the butterworth filter found in scipy ? I am interested 
> in the passband version of this filter since concatenating a low pass and a 
> high pass filter does not produce the same frequency response as the passband 
> filter provided by scipy.
> 
> thanks
> -- 
> Bogdan
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