Which method would you use to adapt to a signal's variations in amplitude?

Amplitude Shift Keying (ASK) is a method used in digital communication to represent digital data by varying the amplitude of a carrier wave. This technique directly encodes information in the amplitude of the transmitted signal, allowing it to adapt to variations in amplitude. When the information bits are transmitted, the signal's amplitude is changed to correspond with the binary value being sent, which makes ASK particularly suitable for scenarios where amplitude variations need to be exploited to convey information.

In situations where the signal strength or quality fluctuates, the amplitude variations in ASK can be used to maintain the integrity and clarity of the transmitted data. This is especially beneficial in environments with varying noise levels, making it a common choice for modulation schemes in various communication systems. Therefore, the method that effectively adapts to variations in amplitude is Amplitude Shift Keying.