A modulation method used to convert the amplitude of an analog signal to digital values is pulse amplitude modulation.

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Pulse Amplitude Modulation (PAM) is a form of signal modulation where the message information is encoded in the amplitude of a series of signal pulses. It is not used to convert the amplitude of an analog signal to digital values directly; rather, it is a method of representing the analog signal in a form that can be more easily converted to digital, but by itself, it does not perform analog-to-digital conversion.

A Modulation Method Used to Convert the Amplitude of an Analog