Question

what type of modulation is required for commercial broadcast of voice signal and for vision broadcast ?

Answer 1

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Given all of these parameters, the result is a mostly-continuous analog signal which can be modulated onto a radio-frequency carrier and transmitted through an antenna. All analog television systems use vestigial sideband modulation, a formof amplitude modulation in which one sideband is partially removed.

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Answer 2

Answer:

There three methods one is ASK(AMPLITUDE SHIFT KEYING), FSK(FREQUENCY SHIFT KEYING) & PSK(PHASE SHIFT KEYING)BUT FOR COMMERCIAL BROADCAST ASK IS USED IN WHICH AMPLITUDE MODIFICATION IS DONE.