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In frequency modulation...

In frequency modulation

A

Frequency of CW remains constant but amplitude changes in accordance with modulating wave frequency

B

Frequency of CW changes in accordance with the modulating wave frequency but the amplitude also changes.

C

Frequency of CW changes in accordance with the frequency of modulating wave frequency but the amplitude remains constant.

D

Frequency of CW changes in accordance with the amplitude of modulating wave amplitude

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The correct Answer is:
D
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Define frequency modulation and state any one advantage of frequency modulation (FM) over amplitude modulation (AM).

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

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-

The difference between phase and frequency modulation

Write two advantages of frequency modulation over amplitude modulation.

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

(A) : In case of frequency modulation, the frequency of the RF carrier is changed by the AF signal and the change is proportional to the amplitude of the AF signal at any instant. (R) : When the AF signal is positive, the carrier frequency increases but it decreases when the AF signal is negative.

An audio signal of 2.8 kHz modulates a carrier of frequency 84 MHz and produces a frequency of deviation of 56kHz. Calculate(i) Frequency modulation index(ii) Frequency range of FM wave.

Match the following {:("(a) Amplitude","(e) Amplitude and angular frequency remains constant"),("(b) Frequency modulation ","(f) Digital transmission"),("(c) Phase modulation","(g) noise creeps in"),("(d) Pulse code modulation","(h) Stereophonic transmission"):}

What should be the transmission bandwidth of an FM signal with 75kHz deviation and highest frequency of modulation 15kHz?

AAKASH SERIES-COMMUNICATION SYSTEMS -Exercise - IA (Modulation)
  1. In amplitude modulation

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  2. Assertion: The units of some physical quantities can be expressed as c...

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  3. AM is used for broadcasting because

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  4. In amplitude modulation

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  5. The tuned circuit the Oscillator in a simple AM transmitter employs a ...

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  6. In frequency modulation

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  7. In a communication system, noise is most likely to affect the signal

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  8. The difference between phase and frequency modulation

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  9. While tuning in a certain broadcast station with a receiver, we are ac...

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  10. Digital signals (i) do not provide a continuous set of values, (ii) re...

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  11. An amino acid under certain conditions have both positive and negative...

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  12. Assertion: AM detection is the process of recovering the modulating si...

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

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  14. In amplitude modulation

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  15. Modem is a device which performs

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  16. Audio signal canot be transmitted because

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  17. Of the following which is preferred modulation scheme for digital comm...

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  18. A basic communication system consists of (A) transmitter (B) informa...

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  19. Digital signals (i) do not provide a continuous set of values, (ii) re...

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  20. Identify the mathematical expression for amplitude modulated wave.

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