Digital Signal and Analog Signal Modulation for CompTIA A+ Computer Training
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Modulation and Demodulation are usually complex concepts for a student to grasp. MODEMs are Modulator/Demodulator devices.
MODEMs, however, always use the carrier wave modulated with a digital signal shown below. Earlier MODEMs sometimes approximated digital signals with a carrier wave modulated with an analog signal.
Five unlabeled waveforms are shown. Next to each of the waveforms indicate which of the following might correctly describe the nature of the signal shown. Note: In some cases several descriptions may be appropriate. In such cases list all appropriate descriptions.
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