Question

Why modulation is needed in communication system?

Answer 1

Modulation allows us to send a signal over a bandpass frequency range. If every signal gets its own frequency range, then we can transmit multiple signals simultaneously over a single channel, all using different frequency ranges. Another reason to modulate a signal is to allow the use of a smaller antenna.

Answer 2

modulation is needed in communication system because the data transmitted bt computers is in the form which is not readable by humans....so as to make the information understandable, modulation is required....
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