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CBSE Class 12-science Answered

Define the term modulation. Name three different types of modulations used for a message signal using a sinusoidal continuous carrier wave. Explain the meaning of any one of these.
Asked by Topperlearning User | 09 Jul, 2014, 10:43: AM
answered-by-expert Expert Answer

Modulation: It is the process in which some characteristic such as amplitude, frequency or phase angle of a high frequency carrier wave is changed in accordance with the instantaneous value of the low frequency modulating signal.

A sinusoidal carrier wave can be modulated in three ways:

(i) Amplitude modulation.

(ii) Frequency modulation.

(iii) Phase modulation.

Phase modulation:When the modulating wave is superimposed on a high frequency carrier wave in a manner that the magnitude of the phase angle of the modulated signal varies in accordance with the amplitude of the modulating wave,the process is called phase modulation.

 

Answered by | 09 Jul, 2014, 12:43: PM

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