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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
Write the functions of the following in communication systems:
Transmitter
Write the functions of the following in communication systems:
Demodulator
Explain the term demodulation used in a communication system.
A device X used in communication system can convert one form of energy into another. Name the device X. Explain the function of a repeater in a communication system.
Distinguish between point to point and broadcast modes of communication. Give an example of each.
Explain the basic concept of mobile telephoning ?
Distinguish between point to point and broadcast modes of communication. Give an example of each.
A 1 KW signal is transmitted using a communication channel which provides attenuation at the rate of – 2dB per km. If the communication channel has a total length of 5 km, the power of the signal received is `["gain in dB" = 10 log ("P"_0/"P"_"i")]`
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.
