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The process in which amplitude of the hi...

The process in which amplitude of the high frequency carrier wave changes accordance with the instantaneous value of modulated signal is

A

amplitude modulation

B

Frequency modulation

C

phase modulation

D

power modulation

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

The process in which phase 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

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. A radio frequency carrier wave can be modulated using a-

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 process of changing some characteristic of a carrier wave in accordance with the intensity of the signal is called.

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

NIKITA PUBLICATION-COMMUNICATION SYSTEMS-Multiple Choice Questions (Production and detection of amplitude modulated wave)
  1. The process in which amplitude of the high frequency carrier wave chan...

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  2. The process in which frequencies of carrier wave changes in accordance...

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  3. The process in which phase of carrier wave changes in accordance with ...

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  4. Frequency modulation and phase modulation together is referred as

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  5. The ratio of peak value of modulated signal to peak value of carrier ...

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  6. To avoid distortion in the signal, modulation index should be

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  7. In amplitude modulation, the bandwidth is

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  8. The process of recovering the audio signal from the modulated wave is ...

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  9. An electronic device which recovers the original audio signal from amp...

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  10. Which of the following is application of amplitude modulation ?

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  11. Citizen's band ratio is the application of

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  12. Draw backs of Amplitude modulation

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  13. In an amplitude modulated wave for audio frequency of 500 "cycle"//sec...

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  14. Amplitude modulation is useful for broadcasting in communication syste...

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  15. The maximum peak ro peak voltage of an AM wire is 24 mV and the minimu...

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

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  17. What is the modulation index of an over modulated wave

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  18. What type of modulation is employed in india for radio transmission

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  19. If audio signal is tranmitted directly into space, the length of the t...

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  20. In amplitude modulation

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