eqiir(1)

NAME
eqiir - Design of iir filters

CALLING SEQUENCE
[cells,fact,zzeros,zpoles]=eqiir(ftype,approx,om,deltap,deltas)

PARAMETERS

ftype
    : filter type ('lp','hp','sb','bp')

approx
    : design approximation ('butt','cheb1','cheb2','ellip')

om  : 4-vector of cutoff frequencies (in radians)
     om=[om1,om2,om3,om4], 0 <= om1 <= om2 <= om3 <= om4 <= pi.
     When ftype=3 or 4, om3 and om4 are not used
     and may be set to 0.

deltap
    : ripple in the passband. 0<= deltap <=1

deltas
    : ripple in the stopband. 0<= deltas <=1

cells
    : realization of the filter as second order cells

fact
    : normalization constant

zzeros
    : zeros in the z-domain

zpoles
    : poles in the z-domain

DESCRIPTION
Design of iir filter interface with eqiir (syredi)

The filter obtained is h(z)=fact*product of the elements of cells.

That is hz=fact*prod(cells(2))./prod(cells(3))