Answer Posted / abhyarthana

One reason to use am for video and fm for sound is noise. As noise signals are voltages that are added in the information signal, they can change amplitude but cannot change the frequency of the signal. In fm if noise is added, it doesn't change the data since the information is contained in frequency variation. this ensure a good quality of audio signal, when demodulated.

Another important reason is the bandwidth requirement. Video signals have much higher b/w than audio signals. Fm cannot provide this much b/w to signal. Thus AM is suitable for video signal.

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