Question

define Angle modulation??

Answer 1

Angle modulation is the process in which the angle of the carrier waves is varied in accordance with the instantaneous amplitude of the modulating signal, keeping constant amplitude of the carries wave.
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Answer 2

Angle modulation is a class of analog modulation that involves varying the angle of a carrier wave according to the amplitude of the modulating baseband signal (the information signal). The amplitude of the carrier is kept constant throughout. Angle modulation methods provide better protection against channel noise than Amplitude Modulation and is less susceptible to non-linear distortion and power loss. However, this is at the cost of increased bandwidth requirements.
Phase Modulation and Frequency Modulation are the two main types of angle modulation.