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The process of superimposing signal freq...

The process of superimposing signal frequency (i.e., audio wave) on the carrier wave is known as:

A

Transmission

B

Reception

C

Modulation

D

Detection

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The correct Answer is:
C
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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 separating radio signal from the modulated wave is known as

The process of recovering the audio signal from the modulated wave is known as

One of the components of frequency of amplitude modulated wave (AM) formed by the superposition of message signal of frequency omega_1 on a carrier wave of frequency omega_2 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

Assertion: The process of retrieval of information from the carrier wave at the reciever is termed as modulation. Reason: Repeater helps to modulate the signals.

Assertion: AM detection is the process of recovering the modulating signal from amplitude modulated waveform wich is carried out using a rectifier and an evelope detector. Reason: Amplitude modulated waves can be produced by application of the message signal and the carrier wave to a non-linear device followed by band pass filter.

In AM wave, carrier power is given by-

AAKASH INSTITUTE ENGLISH-COMMUNICATION SYSTEMS -ASSIGNMENT SECTION A Objective (Only one answer)
  1. A message signal of frequency omega(m) is superposed on a carrier wave...

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  2. A male voice after modulation transmission sounds like that of a femal...

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  3. A basic communication system consists of A. transmitter. B. informati...

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  4. Identify the mathematical expression for amplitude modulated wave

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  5. The distance between consecutive maxima and minima is given by-

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  6. Long distance short-wave radio broadcasting uses

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  7. Broadcasting antennas are generally

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  8. For television broadcasting, the frequency employed is normally

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  9. The sound waves after being converted into electrical waves are not tr...

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  10. The process of superimposing signal frequency (i.e., audio wave) on th...

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  11. In an amplitude modulated wave for audio frequency of 500 cycles/secon...

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  12. If there were no atmosphere, the average temperature on the surface of...

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  13. A TV transmission tower has a height of 240m. Signals broadcast from t...

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  14. Radiowaves of constant amplitude can be generated with

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  15. Ozone layer above earth's atmosphere will not

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  16. An audio signal of amplitude 0.1 V is used in amplitude modulation of ...

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  17. The frequency of amplitude modulated wave is equal to

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  18. The radio waves of frequency ranging from 2 MHz to 30 MHz are called

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  19. A device which connects one computer to another is known as

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  20. The loss of strength of a signal while propagating through a medium is...

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