Signal with linear frequency modulation.
[Y,IFLAW]=fmlin(N) [Y,IFLAW]=fmlin(N,FNORMI) [Y,IFLAW]=fmlin(N,FNORMI,FNORMF) [Y,IFLAW]=fmlin(N,FNORMI,FNORMF,T0)
number of points
initial normalized frequency (default: 0.0)
final normalized frequency (default: 0.5)
time reference for the phase (default: N/2).
signal
instantaneous frequency law (optional).
fmlin generates a linear frequency modulation. The phase of this modulation is such that Y(T0)=1.