PHYSICAL LAYER AND TRANSMISSION MEDIA
DIGITAL TRANSMISSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Encodes the transmitted signal
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Decodes the transmitted signal
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Either A or B
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None of the above
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Detailed explanation-1: -The process of separating the original information or SIGNAL from the MODULATED CARRIER. In the case of AMPLITUDE or FREQUENCY MODULATION it involves a device, called a demodulator or detector, which produces a signal corresponding to the instantaneous changes in amplitude or frequency, respectively.
Detailed explanation-2: -In demodulation, the carrier and message signals are separated to produce the original information signal. The original message signal is mixed with a carrier wave whose parameters must be changed during modulation. To recover the original signal, demodulation is required.
Detailed explanation-3: -Demodulation is extracting the original information-bearing signal from a carrier wave. A demodulator is an electronic circuit (or computer program in a software-defined radio) that is used to recover the information content from the modulated carrier wave.