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In amplitude modulation, amplitude of carrier wave varied according to the

In amplitude modulation, amplitude of carrier wave varied according to the Correct Answer Low frequency base band signal

Correct option:1

Concept:-

Modulation:-  It is the process of attaching a low-frequency base-band signal to the high-frequency carrier wave in order to get high frequency modulated signal for its effective transmission.

2) Frequency modulation (FM): In this kind of modulation the frequency of the carrier signals is modified according to the instantaneous amplitude of the baseband signal in frequency modulation.

Here the phase and the amplitude of the carrier signal remain constant. 
An increase in the amplitude of the baseband signal increases the frequency of the carrier and vice-versa.

[ alt="FM" src="//storage.googleapis.com/tb-img/production/21/06/FM.png" style="width: 332px; height: 327px;">

3) Phase Modulation (PM): If the instantaneous amplitude of the baseband signal modifies the phase of the carrier signal keeping the frequency and amplitude constant is called Phase modulation and this modulation is used to generate frequency-modulated signals.

It is similar to frequency modulation except that in this modulation the phase of the carrier is varied instead of varying frequency.

[ alt="PM" src="//storage.googleapis.com/tb-img/production/21/06/PM.png" style="width: 313px; height: 213px;">

Related Questions

Consider the following statements regarding modulation : 1. The communication systems, where a weak signal is transmitted by the use of a modulation is essential in carrier signal. 2. When the frequency of the high frequency signal is varied in accordance with the intensity of the low-frequency weak signal, the modulation is said to be frequency modulation. 3. The process of recovering original baseband signal from the modulated signal is called phase modulation. Which of the above statements are correct ? 
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