scipy.signal.ellipap#
- scipy.signal.ellipap(N, rp, rs)[source]#
Return (z,p,k) of Nth-order elliptic analog lowpass filter.
The filter is a normalized prototype that has rp decibels of ripple in the passband and a stopband rs decibels down.
The filter’s angular (e.g., rad/s) cutoff frequency is normalized to 1, defined as the point at which the gain first drops below
-rp
.See also
ellip
Filter design function using this prototype
References
- 1
Lutova, Tosic, and Evans, “Filter Design for Signal Processing”, Chapters 5 and 12.
- 2
Orfanidis, “Lecture Notes on Elliptic Filter Design”, https://www.ece.rutgers.edu/~orfanidi/ece521/notes.pdf