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What is meant by detection of a signal in a communication system? With the help of a block diagram explain the detection of AM signal.

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Detection is the process of recovering the modulating signal from the modulated carrier wave.

Explanation of Detection with the help of a block diagram:

The modulated carrier wave contains frequencies wc ± wm. The detection means to obtain message signal m(t) of frequency wm.The method is shown in the form of a block diagram. The modulated signal is passed through a rectifier. It produces rectified wave [fig.(b)]; the envelope of which is the message signal. The rectified wave is passed through an envelope detector, whose output is the required message signal m(t).

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