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Monday, 13 March 2017

Communication Systems - III


Modulation:
The process of changing some characteristic such as amplitude, frequency or phase of a carrier wave in accordance with the intensity of the signal is known as modulation.

Types of Modulation:
a) Amplitude modulation
b) Frequency modulation
c) Phase modulation.

Amplitude Modulation:
The amplitude of the carrier wave changes according to the intensity of the signal. The amplitude variation of the carrier wave is at the signal frequency fs .

Production of Amplitude Modulated Wave:
Amplitude modulated waves can be produced by application of the message signal and the carrier wave to a non-linear device, followed by a band pass filter.

Modulation Factor:
The ratio of change of amplitude of carrier wave to the amplitude of normal carrier wave is called modulation factor (m).

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