Advertisements
Advertisements
प्रश्न
What is the function of a bandpass filter used in a modulator for obtaining AM signal?
Advertisements
उत्तर
The output produced by the square-law device is passed to the bandpass filter which rejects the dc and the sinusoids of frequencies wm, 2wm, and 2wc and retains the frequencies wc, wc – wm, and wc + wm. The output of the bandpass filter is an AM wave.
APPEARS IN
संबंधित प्रश्न
Explain the terms Attenuation used in Communication System.
Write the functions of the following in communication systems:
Modulator
Write the functions of the following in communication systems:
Transducer
Write the functions of the following in communication systems:
Demodulator
Explain the term demodulation used in a communication system.
Distinguish between broadcast mode and point-to-point mode of communication and give one example for each.
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 ?
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")]`
