Generate gaussian amplitude modulation.
Y=amgauss(N) Y=amgauss(N,T0) Y=amgauss(N,T0,T)
number of points.
time center (default : N/2).
time spreading (default : 2*sqrt(N)).
signal.
amgauss generates a gaussian amplitude modulation centered on a time T0, and with a spread proportional to T. This modulation is scaled such that Y(T0)=1 and Y(T0+T/2) and Y(T0-T/2) are approximately equal to 0.5 .