Mid-point construction used in the interference diagram.
[TI,FI]=midpoint(T1,F1,T2,F2,K)
time-coordinate of the first point
frequency-coordinate of the first point (>0)
time-coordinate of the second point
frequency-coordinate of the second point (>0)
power of the group-delay law
Wigner-Ville
D-Flandrin
Bertrand (unitary)
Unterberger (active)
Margenau-Hill-Rihaczek
time-coordinate of the interference term
frequency-coordinate of the interference term
midpoint gives the coordinates in the time-frequency plane of the interference-term corresponding to the points (T1,F1) and (T2,F2), for a distribution in the affine class perfectly localized on power-law group-delays of the form : tx(nu)=t0+c nu^(K-1).