Define modulation. Write any two types of modulation of carrier wave.

In an amplitude modulation with modulation index 0.5 the ratio of the carrier wave to that of side band in the modulated wave is

The concepts of communication are ( a ) mode of communication ( b ) need for modulation ( c ) types of modulation ( d ) detection of modulated wave

Assertion: Amplitude modulation shows more interference than frequency modulation with noise. Reason: Interference is function of amplitude of modulation wave with carrier wave.

Why is the amplitude of modulating signal kept less than the amplitude of carrier wave ?

In frequency modulation, the frequency of the modulated wave varies as

If a number of sine waves with modulation indices n,n,n ........ modulate a carrier wave, then total modulation index ( n ) of the wave is

If a number of sine waves with modulation indices n_(1),n_(2),n_(3) … modulate a carrier wave, then total modulation index (n) of the wave is

Both amplitude modulation (AM) and frequency modulation (FM) are used for radio broadcasting. The amplitude of the high frequency carrier wave is varied or modulated in accordance with the variations in the amplitude of the audio signals that are to be transmitted, in te process of amplitude modulation in frequency modulation te amplitude of the carrier remains constant but its frequency is varied inn accordance withh the audio signal. Reception with AM signals is in general is affected by interference of various kinds ad elaborated equipment is required for FM broadcast. A radio frequency carrier wave can be modulated using a-

A sinusoidal carrier voltage of 120 V is amplitude modulated by a sinusoidal voltage of frequency 10KHz. What is the modulation index if the maximum modulated carrier amplitude is 150 V ?