I don't think you are grasping the idea of the low pass filter. It is to r= eject the carrier, not just the aliasing. You want the modulated signal wi= thout the carrier. So the cutoff frequency of the filter would be above yo= ur modulating signal frequency and below the carrier frequency. Everything= else you decide will depend on the details of your problem. =20 BTW, you can do better if you first run the rectified signal through a peak= pick algorithm with a time window of about one cycle of your carrier. The= n you will have a data set to filter that has already been significantly sm= oothed. In fact, you can skip the rectification and just use the peak dete= ctor instead.=20 Rick
Re: AM digital demodulation using the absolute value
Started by ●December 20, 2010