Home
Class 12
PHYSICS
If f(c) and f(m) are the frequencies of ...

If `f_(c)` and `f_(m)` are the frequencies of carrier wave and signal, then the band width is

A

`f_(m)`

B

`2f_(m)`

C

`f_(c)`

D

`2f_(c)`

Text Solution

Verified by Experts

The correct Answer is:
B
band width `=(f_(c)+f_(m))-(f_(c)-f_(m))=2f_(m)`
Promotional Banner

Topper's Solved these Questions

  • COMMUNICATION SYSTEM

    NARAYNA|Exercise Level-III|11 Videos

  • COMMUNICATION SYSTEM

    NARAYNA|Exercise NCERT Based|16 Videos

  • COMMUNICATION SYSTEM

    NARAYNA|Exercise Level-I(C.W)|16 Videos

  • CAPACITANCE

    NARAYNA|Exercise Previous IIT-JEE|16 Videos

  • CURRENT ELECTRICITY

    NARAYNA|Exercise Level 6|43 Videos

Similar Questions

Explore conceptually related problems

If 2f_(c) and 3f_(m) are the frequencies of carrier wave and signal, then the band width is

How is amplitude modulation achieved ? (b) The frequencies of two side bands in an AM weve are 640 kHz and 660 kHz respectively. Find the frequencies of carrier and modulating signal. What is the bandwidth required for amplitude modulation ?

Message Signals And Their Band Width

If f_(0) and f_(f) represent the carrier wave frequencies for amplitude and frequency modulations respectively, then

In a detector, output circuit consists of R = 10kOmega and C = 100 p F. Calculate the frequency of carrier signal it can detect.

The process in which frequencies of carrier wave changes in accordance with instantaneous value of modulated signal is

The efficient transmission of signals is achieved by superimposing electrical audio signals on a high frequency carrier wave (the process is known as modulation). When the amplitude of high frequency carrier wave is changed in accordance with the intensity of modulating signal, it is called amplitude modulation. The extent to which the amplitude of carrier wave is changed by the signal is described by modulation factor. It is given as m="Amplitude change of carrier wave"/"Amplitude of unmodulated carrier wave" Let a carrier wave is represented by V_c=V_c cos omega_ct Let the modulation factor be m, the maximum change in amplitude of carrier wave is mV_c So, modulating signal can be represented as v_m=mV_c cosomega_mt So, the amplitude of modulated wave is =V_c+mV_c cosomega_m t Using this value, the instantaneous voltage of modulated wave is E=V_c cos omega_c t+ (mV_c)/2 cos (omega_c+omega_m)t + (mV_c)/2 cos (omega_c-omega_m ) t The above wave contains three frequencies namely, f_c, f_c+f_m and f_c-f_m . The frequencies f_c+f_m and f_c-f_m are called side band frequencies , USB and LSB respectively. The fraction of total power carried by side band frequencies is

The efficient transmission of signals is achieved by superimposing electrical audio signals on a high frequency carrier wave (the process is known as modulation). When the amplitude of high frequency carrier wave is changed in accordance with the intensity of modulating signal, it is called amplitude modulation. The extent to which the amplitude of carrier wave is changed by the signal is described by modulation factor. It is given as m="Amplitude change of carrier wave"/"Amplitude of unmodulated carrier wave" Let a carrier wave is represented by V_c=V_c cos omega_ct Let the modulation factor be m, the maximum change in amplitude of carrier wave is mV_c So, modulating signal can be represented as v_m=mV_c cosomega_mt So, the amplitude of modulated wave is =V_c+mV_c cosomega_m t Using this value, the instantaneous voltage of modulated wave is E=V_c cos omega_c t+ (mV_c)/2 cos (omega_c+omega_m)t + (mV_c)/2 cos (omega_c-omega_m ) t The above wave contains three frequencies namely, f_c, f_c+f_m and f_c-f_m . The frequencies f_c+f_m and f_c-f_m are called side band frequencies , USB and LSB respectively. If modulation factor is 100% , the amplitude change of carrier wave is

The device used for addition of high frequency carrier wave and information signal is

NARAYNA-COMMUNICATION SYSTEM-Level-II(C.W)
  1. The amplitude modulated current is given by i=125[1+0.6sin2900t]sin(...

    Text Solution

    |

  2. An audio signal 25sin2pi(1400t) amplitude modulates 80sin2pi(10^(5)t)....

    Text Solution

    |

  3. If f(c) and f(m) are the frequencies of carrier wave and signal, then ...

    Text Solution

    |

  4. The number of AM broadcast stations that can be accomodated in a 300kH...

    Text Solution

    |

  5. A 1000 kHz carrrier is simultaneously modulated with 300Hz, 800Hz and ...

    Text Solution

    |

  6. Depth of modulation in terms of E(max) and E(min) is

    Text Solution

    |

  7. If V(c) is amplitude of carrier wave in AM transmitter where modulatio...

    Text Solution

    |

  8. If a carrier wave of amplitude 10mV is modulated by an audio signal of...

    Text Solution

    |

  9. The amplitude modulated current is given by i=125[1+0.6sin2900t]sin1...

    Text Solution

    |

  10. If minimum voltage in an AM wave was found to be 2V and maximum voltag...

    Text Solution

    |

  11. Sinusoidal carrier voltage of frequency 1.5 MHz and amplitude 50V is a...

    Text Solution

    |

  12. A transmitter supplies 9kW to the aerial when unmodulated. The power r...

    Text Solution

    |

  13. The total power content of an AM wave is 1500 W. For 100% modulation, ...

    Text Solution

    |

  14. The bit rate for a signal, which has a sampling rate of 8 kHz and whar...

    Text Solution

    |

  15. The antenna current of an AM transmitter is 8A when only the carrier i...

    Text Solution

    |

  16. In a diode AM- dectector, the output circuit consist of R=1 kW and C=1...

    Text Solution

    |

  17. In an FM system a 7 kHz signal modulates 108 MHz carrier so that frequ...

    Text Solution

    |

  18. Maximum usable frequency (MUF) in F-region layer is x, when the critic...

    Text Solution

    |

  19. Suppose that the modulating signal is m(t)=2cos(2pif(m)t) and the carr...

    Text Solution

    |

  20. C(t) and m(t) are used to generate an AM signal. The modulation indes ...

    Text Solution

    |