low-pass to other filter transform
hzt=trans(hz,tr_type,frq) hzt=trans(pd,zd,gd,tr_type,frq) [pt,zt,gt]=trans(hz,tr_type,frq) [pt,zt,gt]=trans(pd,zd,gd,tr_type,frq)
a single input single output discrete transfer function, the low pass filter
Vector of given filter poles
Vector of given filter zeros
scalar: the given filter gain
string, the type of transformation, see description for possible values
2-vector of discrete cut-off frequencies
(i.e.,0<frq<.5
). see description
for details.
transformed filter transfert function.
vector of transformed filter zeros.
vector of transformed filter poles.
a scalar: transformed filter gain.
function for transforming standardized low-pass filter given its poles-zeros_gain representation into one of the following filters:
low pass filter, the cutoff frequency is given by the
first entry of frq
, the second one is ignored.
high pass filter, the cutoff frequency is given by the
first entry of frq
, the second one is ignored.
band pass filter, the frequency range is given by frq(1)
and frq(2)
.
stop band filter, the frequency range is given by frq(1)
and frq(2)
.
Hlp=iir(3,'lp','ellip',[0.1 0],[.08 .03]); Hbp=trans(Hlp,'bp',[0.01 0.1]); Hsb=trans(Hlp,'sb',[0.01 0.1]) clf();gainplot([Hlp;Hbp;Hsb],1d-3,0.48); l=legend(['original low pass';'band pass';'stop band']); l.legend_location="in_lower_left"; | ![]() | ![]() |