![]() ![]() It is the component of the modulating signal to the signal shaping, while is added a proportion of the carrier signal, attenuated by the filter. If you do not connect the diode, and only you process the AM signal with a low pass filter, you get the modulating signal, to which is added the carrier signal. ![]() ![]() This is one way of demodulating an AM signal, more precisely, it is called asynchronous demodulation. What you call envelope detector, consists of the detection diode and a low-pass filter.
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