## anonymous 5 years ago explain amplitude modulation with block diagram, and woking of A.M. receiver.

AM modulation is multipliation of the signal with some carrier signal whose frequency is much larger than the maximum frequency of the signal. $y(t) = \cos \omega t*\cos \omega _{c}t=(1/2)(\cos(\omega+\omega_{c})t + \cos(\omega-\omega_{c})t )$ Demodulation is basically multiplication by the same carrier frequency signal followed by low pass filtering. It becomes easily understood when signals are represented in frequency domain and multiplication becomes convolution.