Initial commit.
import pylab as pl
def p_margin(H, type='d', Ts=1):
// |h(e^(i*w*dt))|=1 <-- h(e^(i*w*dt))*h(e^(-i*w*dt))
z=poly(0,varn(h.den));
den = H.den
sm=simp_mode();simp_mode(%f);hh=h*horner(h,1/z)-1;simp_mode(sm)
//find the numerator roots
z=roots(hh.num);
z(abs(abs(z)-1)>eps)=[];// retain only roots with modulus equal to 1
w=log(z)/(%i*dt);
ws=real(w(abs(imag(w))<eps&real(w)>0)); //frequency points with unitary modulus
if ws==[] then phm=%inf,fr=[],return,end
f=horner(h,exp(%i*ws*dt));
end
return phm, fr
def g_margin(H, type='d', Ts=1):
return gm, fr