Advertisements
Advertisements
प्रश्न
What is the function of a bandpass filter used in a modulator for obtaining AM signal?
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 : Transmitter in communication system
Write the functions of the following in communication systems:
Transducer
Write the functions of the following in communication systems:
Demodulator
Explain the terms Demodulation used in Communication System.
Distinguish between broadcast mode and point-to-point mode of communication and give one example for each.
Explain the basic concept of mobile telephoning ?
Write the functions of the transducer and repeaters.
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")]`
Which of the following would produce analog signals and which would produce digital signals?
- A vibrating tuning fork.
- Musical sound due to a vibrating sitar string.
- Light pulse.
- Output of NAND gate.
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).
