Frequency modulation in gnu-octave : square wave carrier and sinusoidal message
Frequency modulation is a common analog modulation technique. Here the instantaneous frequency of the carrier wave is varied with the instantaneous amplitude of the message signal. That is the information regarding the message is available in the frequency of the carrier. It is a kind of more generic technique called angle modulation. [][1]Sinusoidal frequency modulation of square wave carrier Gnu-octave has built-in function fmmod() available in octave-communications package for implementing frequency modulation. But this function modulates the given message signal with a sinusoidal carrier of specified frequency. If we want the carrier to be a square wave as shown in the figure, the built-in function would not help. ...