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why do we require modulation?

why do we require modulation?

Grade:Upto college level

1 Answers

Apoorva Arora IIT Roorkee
askIITians Faculty 181 Points
9 years ago
The aim of digital modulation is to transfer a digital bit stream over an analog bandpass channel, for example over the public switched telephone network (where a bandpass filter limits the frequency range to 300–3400 Hz), or over a limited radio frequency band.

The aim of analog modulation is to transfer an analog baseband (or lowpass) signal, for example an audio signal or TV signal, over an analog bandpass channel at a different frequency, for example over a limited radio frequency band or a cable TV network channel.

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