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प्रश्न
Write the functions of the following in communication systems:
Modulator
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उत्तर
Modulator: Modulator modulates the message signal, i.e. it superimposes a low-frequency message signal on a high frequency carrier wave, so that the low-frequency message signal can be transmitted over long distances.
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संबंधित प्रश्न
What is the function of a 'Repeater' used in communication system?
Write the functions of the following in communication systems:
Transmitter
Write the functions of the following in communication systems:
Demodulator
Distinguish between point to point and broadcast modes of communication. Give an example of each.
Distinguish between point to point and broadcast modes of communication. Give an example of each.
What is the function of a bandpass filter used in a modulator for obtaining AM signal?
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.
