You can create AM modulation simply by multiplying a carrier and a modulating signal. See attached vi. The sample rates must be the same for both or the multiplication won't work. FM is a bit more tricky. You would have to somehow vary the frequency with the modulating signal. Perhaps inside a For loop, you could create a waveform point by point. I really don't have time to tackle this one. Some hints: Put a sinewave generator in a loop. Set the parameters to create just a few data points (cluster at bottom of icon, top value is sampling rate, bottom value is # points). Break modulating signal into an array of data values. Feed this array into the for loop with indexing on. Use each data point to manipulate the frequency input to the sinewave generator (perhaps multiplying the data point times the carrier frequency). Use a shift register and build waveform to collect data for each loop iteration. The output of the loop should be an FM modulated signal.
Message Edited by tbob on 08-25-2005 01:12 PM
