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The process of changing some characteris...

The process of changing some characteristic of a carrier wave in accordance with the intensity of signal to be transmitted is called

A

Amplification

B

Rectification

C

Modulation

D

None of these

Text Solution

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The correct Answer is:
C
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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

Both amplitude modulation (AM) and frequency modulation (FM) are used for radio broadcasting. The amplitude of the high frequency carrier wave is varied or modulated in accordance with the variations in the amplitude of the audio signals that are to be transmitted, in te process of amplitude modulation in frequency modulation te amplitude of the carrier remains constant but its frequency is varied inn accordance withh the audio signal. Reception with AM signals is in general is affected by interference of various kinds ad elaborated equipment is required for FM broadcast. In india the radio signals are boarcast using-

Both amplitude modulation (AM) and frequency modulation (FM) are used for radio broadcasting. The amplitude of the high frequency carrier wave is varied or modulated in accordance with the variations in the amplitude of the audio signals that are to be transmitted, in te process of amplitude modulation in frequency modulation te amplitude of the carrier remains constant but its frequency is varied inn accordance withh the audio signal. Reception with AM signals is in general is affected by interference of various kinds ad elaborated equipment is required for FM broadcast. The rangeof a transmitter 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

Unpolarised light falls on two polarizing sheets placed one on top of the other. What must be the angle between the characteristic directions of the sheets if the intensity of the final transmitted light is one-third the maximum intensity of the first transmitted beam?

The modulation in which pulse. Duration varies in accordance with the modulating signal is called

The modulation in which pulse. Duration varies in accordance with the modulating signal is called

The process by which a solid changes into a liquids is called

AAKASH INSTITUTE ENGLISH-COMMUNICATION SYSTEMS -ASSIGNMENT SECTION B Objective (Only one answer)
  1. Which of the following is an advantage of FM over AM?

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  2. The process of changing some characteristic of a carrier wave in accor...

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  3. Modulation is done in

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  4. 'Need for modulation'' arises due to which of the following reasons?

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  5. The area of the region covered by the TV., broadcast by a T.V. tower o...

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  6. A ground receiver station is receiving a signal at 500 MHz transmitted...

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  7. AN information signal of 150MHz is to be sent across a distance of 40k...

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  8. In an AM wave for audio frequency of 3400 cycle/s, the appropriate car...

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  9. For VHF television broadcasting, the frequency employed is generally

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  10. On a particular day the maximum frequency reflected from the lonospher...

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  11. Line of sight (LOS) communication is also known as

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  12. If a carrier wave of 1000 kHz is used to carry the signal, the length ...

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  13. Modem is a device used for

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  14. In frequency modulation

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  15. The communication satellites are parked at a height of (from surface o...

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  16. 3-30 MHz frequency range is known as

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  17. Long distance short-wave radio broadcasting uses

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  18. A photodetector is made from a compound semiconductor with band gap 0....

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  19. What is the range of frequencies used in state satellite communication...

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  20. Digital signals

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