What is the need for doing modulation ?

(a) Describe briefly three factors which justify the need for modulation of audio frequency signals over long distances in communication . (b) Draw the waveforms of (i) carrier wave , (ii) a modualating signal and , (iii) amplitude modulated wave.

What is the need for classification of elements ?

Modulators

Write any two factors which justify the need for modulating a signal.

Write two factors justifying the need of modulation for transmission of a signal.

Define the term 'amplitude modulation'. Explain any two factors which justify the need for modulating a low frequency base-band signal.

What is the purpose of modulating a singnal in transmission?

Degree of modulation-

A carrier frequency of 1 MHz and peak value of 10 V is amplitude modulated with a signal frequency of 10 KHz with peak value of 0.5 V. What are the values of the modulation index and the side band frequencies ?

In frequency modulation