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     06/28/2009


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.

Descriptions:

  1. digital signal represented using manchester encoding

  2. digital signal represented using on-off keying

  3. carrier wave modulated with an analog signal

  4. carrier wave modulated with a digital signal

  5. carrier wave
carrier wave
modulated with
an analog signal
carrier wave
carrier wave
modulated with
a digital signal
digital signal
represented
using on-off keying
1010010101101001
digital signal
represented
using manchester
encoding

 

Three unlabeled waveforms are shown below. One represents a carrier wave, one a digital signal to be transmitted and the last a modulated wave for transmission. Label each waveform appropriately.

modulated wave
carrier wave
digital signal

Three unlabeled waveforms are shown below. One represents a carrier wave, one an analog signal to be transmitted and the last a modulated wave for transmission. Label each waveform appropriately.

analog signal
modulated wave
carrier wave

 

 

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