Advertisements
Advertisements
प्रश्न
Write the functions of the following in communication systems:
Demodulator
Advertisements
उत्तर
Demodulator is important components of communication systems. Its functions are as follows:
Demodulator: A demodulator demodulates the modulated signal, i.e. it separates the low frequency message signal that has been superimposed on high frequency carrier wave and retrieves the information from the carrier wave at the receiver.
APPEARS IN
संबंधित प्रश्न
Explain the terms : Transmitter in communication system
What is the function of a 'Repeater' used in communication system?
Explain the term demodulation used in a communication system.
Explain the basic concept of mobile telephoning ?
Distinguish between point to point and broadcast modes of communication. Give an example of each.
Write the function of receiver in communication system.
A basic communication system consists of ______.
- transmitter.
- information source.
- user of information.
- channel.
- receiver.
Choose the correct sequence in which these are arranged in a basic communication system:
Audio sine waves of 3 kHz frequency are used to amplitude modulate a carrier signal of 1.5 MHz. Which of the following statements are true?
- The sideband frequencies are 1506 kHz and 1494 kHz.
- The bandwidth required for amplitude modulation is 6 kHz.
- The bandwidth required for amplitude modulation is 3 MHz.
- The side band frequencies are 1503 kHz and 1497 kHz.
Figure shows a communication system. What is the output power when input signal is of 1.01 mW? (gain in dB = 10 log10 (Po/Pi).
An audio signal is modulated by a carrier wave of 20 MHz such that the bandwidth required for modulation is 3 kHz. Could this wave be demodulated by a diode detector which has the values of R and C as
- R = 1 kΩ, C = 0.01 µF.
- R = 10 kΩ, C = 0.01 µF.
- R = 10 kΩ, C = 0.1 µF.
