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In frequency modulation...

In frequency modulation

A

the amplitude of modulated wave varies as frequency of carrier wave

B

the frequency of modulated wave varies as amplitude of modulating wave

C

the amplitude of modulated wave varies as amplitude of carrier wave

D

the frequency of modulated wave varies as frequency of modulating wave

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The correct Answer is:
D
The process of changing the frequency of a carrier wave (modulated wave) is known as frequency modulation (FM).
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Define frequency modulation and state any one advantage of frequency modulation (FM) over amplitude modulation (AM).

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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-

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Write two advantages of frequency modulation over amplitude modulation.

(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"):}

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NCERT FINGERTIPS ENGLISH-COMMUNITCATION SYSTEMS-Assertion And Reason
  1. In frequency modulation

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  2. Assertion: Telephony is an example of point-to-point communication mod...

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  3. Assertion: The loss of strength of a signal while propagating through ...

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  4. Assertion: Amplification is necessary to compensate for the attenualti...

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  5. Assertion: The process of retrieval of information from the carrier wa...

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  6. Assertion: Digital signals are continous variations of voltage of curr...

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  7. Assertion: Microwave communication is preferred over optical communica...

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  8. Assertion: The ionosphere layer acts as a reflector for all range of f...

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  9. Assertion: It is possible to transmit signals from one place on the ea...

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  10. Statement-1: Short wave band are used for transmission fo radiowaves t...

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  11. Assertion : The information contained in our original low frequency ba...

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  12. Assertion: Long distance communication between two points on the earth...

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  13. Assertion: The television signals are propagated through sky waves. R...

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  14. Assertion: Space waves are used for line -of -sight communication. R...

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  15. Assertion: When the height of a TV transmission tower is increased by ...

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

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  17. Assertion: Telephony is an example of point-to-point communication mod...

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  18. Assertion: The loss of strength of a signal while propagating through ...

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  19. Assertion: Amplification is necessary to compensate for the attenualti...

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  20. Assertion: The process of retrieval of information from the carrier wa...

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  21. Assertion: Digital signals are continous variations of voltage of curr...

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