(a)Define amplitude modulation.
(b)State the function of the following in an AM superheterodyne receiver:
(i) local oscillator;
(ii) detector.
(c) An AM superheterodyne receiver tuned to frequency of 1600 Hz works at an intermediate frequency of 455 Hz. Calculate its local oscillator
frequency.
(d) State the type of modulation used for the sound and video portions
respectively in television transmission.