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Which of the following is/are correct? 1. Detection is the process of recovering the modulating signal from the modulated carrier wave. 2. The carrier frequency is usually changed to a lower frequency by what is called an intermediate frequency (IF) stage preceding the detection.

Which of the following is/are correct? 1. Detection is the process of recovering the modulating signal from the modulated carrier wave. 2. The carrier frequency is usually changed to a lower frequency by what is called an intermediate frequency (IF) stage preceding the detection. Correct Answer Both 1 and 2

The correct answer is Both 1 and 2.

Key Points

  • The transmitted message gets attenuated in propagating through the channel.
  • The receiving antenna is therefore to be followed by an amplifier and a detector.
  • In addition, to facilitate further processing, the carrier frequency is usually changed to a lower frequency by what is called an intermediate frequency (IF) stage preceding the detection. Hence, Statement 2 is correct.
  • The detected signal may not be strong enough to be made use of and hence is required to be amplified. 
  • Detection is the process of recovering the modulating signal from the modulated carrier wave. Hence, Statement 1 is correct.
  • The modulated signal of form is passed through a rectifier to produce the output.
  • The envelope of a signal is the message signal. 
  • In order to retrieve m(t), the signal is passed through an envelope detector (which may consist of a simple RC circuit).
  • There is one specific type of analog modulation namely Amplitude Modulation (AM).
  • Other forms of modulation and digital communication systems play an important role in modern communication.
  • These and other exciting developments are taking place every day.
  • So far we have restricted our discussion to some basic communication systems.

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Related Questions

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