FW: SV: [sdiy] Mopho modulation DAC configuration, update rate, etc

[Ian Fritz]

At 11:19 AM 2/6/2010, Jerry Gray-Eskue wrote:
>I guess I have not been on this board long enough to have seen the
>discussions and have not seen any of the write ups.

Ah, OK, understood.  Yes, the FM business is a bit hard to get one's head 
around at first.  The main idea is that the input to the integrator is the 
rate of change of the phase angle, ie the instantaneous frequency.  This in 
turn is a DC plus AC signal.  So the signal is (assuming Sin waves) is 
something like

Sin[ DC . t +  Integral(AC)] =
Sin[w_0 . t  +  m Cos(w_m . t)]

This is just the usual FM equation from signal theory.

   Ian