Signal with power-law frequency modulation.
[X,IFLAW]=fmpower(N,K,P1) [X,IFLAW]=fmpower(N,K,P1,P2)
number of points in time
degree of the power-law (K~=1)
if the number of input arguments (NARGIN) is 3, P1 is a vector containing the two coefficients [F0 C] for a power-law instantaneous frequency (sampling frequency is set to 1). If NARGIN=4, P1 (as P2) is a time-frequency point of the form [Ti Fi]. Ti is in seconds and Fi is a normalized frequency (between 0 and 0.5). The coefficients F0 and C are then deduced such that the frequency modulation law fits the points P1 and P2.
same as P1 if NARGIN=4 (optional)
time row vector containing the modulated signal samples
instantaneous frequency law
fmpower generates a signal with a power-law frequency modulation. X(t) = exp(j*2*pi(F0*t + C/(1-K)*abs(t).^(1-K)))