Which modulation changes amplitude to represent digital data?

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Multiple Choice

Which modulation changes amplitude to represent digital data?

Explanation:
The idea is encoding data by changing the strength of the carrier signal. Amplitude shift keying uses discrete amplitude levels to represent digital symbols. For binary data, two amplitudes map to 0 and 1 (sometimes one level is just the carrier on, and the other is off, which is on-off keying). This makes the amplitude of the carrier the carrier of the information itself. In contrast, phase shift keying changes the carrier’s phase to encode data, and frequency modulation changes the carrier’s frequency. So, using amplitude changes to carry digital data is the hallmark of amplitude shift keying.

The idea is encoding data by changing the strength of the carrier signal. Amplitude shift keying uses discrete amplitude levels to represent digital symbols. For binary data, two amplitudes map to 0 and 1 (sometimes one level is just the carrier on, and the other is off, which is on-off keying). This makes the amplitude of the carrier the carrier of the information itself. In contrast, phase shift keying changes the carrier’s phase to encode data, and frequency modulation changes the carrier’s frequency. So, using amplitude changes to carry digital data is the hallmark of amplitude shift keying.

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