zpell
=====

lowpass elliptic filter



Calling Sequence
~~~~~~~~~~~~~~~~


::

    [zeros,poles,gain]=zpell(epsilon,A,omegac,omegar)




Arguments
~~~~~~~~~

:epsilon real : ripple of filter in pass band ( `0<epsilon<1`)
: :A real : attenuation of filter in stop band ( `A>1`)
: :omegac real : pass band cut-off frequency in Hertz
: :omegar real : stop band cut-off frequency in Hertz
: :zeros resulting zeros of filter
: :poles resulting poles of filter
: :gain resulting gain of filter
:



Description
~~~~~~~~~~~

Poles and zeros of prototype lowpass elliptic filter. `gain` is the
gain of the filter



See Also
~~~~~~~~


+ `ell1mag`_ magnitude of elliptic filter
+ `eqiir`_ Design of iir filters


.. _eqiir: eqiir.html
.. _ell1mag: ell1mag.html