Define “amplitude modulation index” Define MODEM and name its various modem ?

Themodulation indexof anamplitude modulatedsignal isdefinedas the measure or extent ofamplitudevariation about an un-modulatedcarrier. In other words theamplitude modulation indexdescribes the amount by which themodulatedcarrier envelope varies about the static level

Amodemis a network device that both modulates and demodulates analog carrier signals (called sine waves) for encoding and decoding