Background of Angle Modulation

Angle modulation is a technique used in telecommunications to transmit information through a carrier wave by varying the angle or phase of the wave in response to the modulating signal. There are two types of angle modulation: frequency modulation (FM) and phase modulation (PM).

Angle Modulation

FM is a modulation technique where the frequency of the carrier wave is varied in proportion to the amplitude of the modulating signal. This means that as the amplitude of the modulating signal increases, the frequency of the carrier wave also increases, and vice versa. FM is commonly used in radio broadcasting, where the amplitude of the modulating signal represents the audio signal being transmitted.

PM, on the other hand, is a modulation technique where the phase of the carrier wave is varied in proportion to the amplitude of the modulating signal. In PM, the amplitude and frequency of the carrier wave remain constant, but the phase of the wave changes in response to the modulating signal. PM is commonly used in digital communication systems, where it can be used to transmit digital data by encoding the data as changes in the phase of the carrier wave.

Both FM and PM have advantages and disadvantages depending on the application. FM is more resistant to noise than AM (amplitude modulation) and has a wider bandwidth, making it useful for high-fidelity audio transmission. PM, on the other hand, can transmit more information per unit of bandwidth than FM, making it useful for digital communication systems.

 

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