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communications 1 > Angular Modulation > Flashcards

Angular Modulation Flashcards

1
Q

A modulation technique wherein the amplitude of the carrier is kept constant while the angle or the argument of the carrier is varied in accordance with the intelligence signal

A

Angular Modulation

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2
Q

2 kinds of angular modulation

A

Frequency Modulation and Phase Modulation

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3
Q

a form of angle modulation where the frequency of the carrier is varied in accordance with the instantaneous value of the intelligence signal.

A

Frequency Modulation

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4
Q

the amount of change in the carrier frequency produced by the modulating signal.

A

Frequency Deviation

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5
Q

Frequency Deviation

A

the amount of change in the carrier frequency produced by the
modulating signal.

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6
Q

In FM, the intelligence amplitude, Em, determines the

A

amount of carrier frequency change

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7
Q

In FM, the intelligence frequency, fm, determines the

A

rate of change of the carrier frequency

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8
Q

Ratio of the frequency deviation over modulating frequency

A

Modulation Index (FM)

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9
Q

Modulation Index (FM)

A

Ratio of the frequency deviation over modulating frequency

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10
Q

Whenever the maximum allowable frequency deviation and the maximum modulating frequency are used in computing the modulation index.

A

Deviation Ratio

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11
Q

Expression of the worst case modulation index.

A

Deviation Ratio

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12
Q

FCC Rules
FM

A

max carrier deviation = 75 kHz
max intelligence f = 15 kHz

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13
Q

FCC Rules
TV Sound

A

max carrier deviation = 25 kHz
max intelligence f = 15 kHz

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14
Q

FCC Rules
Public Safety Services

A

max carrier deviation = 5 kHz
max intelligence f = 3 kHz

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15
Q

FCC Rules
Amateur Band Radio

A

max carrier deviation = 3 kHz
max intelligence f = 3 kHz

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16
Q

Advantages of FM over AM

A
  • better noise immunity
  • rejection of interfering signals because of “capture effect”
  • better transmitter efficiency
17
Q

Disadvantages of FM over AM

A
  • large bandwidth
  • more complex and expensive circuits
  • reception is limited
18
Q

boosts the high audio frequencies in modulation at the transmitter, used to improve the signal-to-noise ratio.

A

Pre-Emphasis Circuit

19
Q

attenuates the high audio frequencies (at the receiver) by the same amount that they were boosted

A

De-Emphasis Circuita form of angle modulation where the phase of the carrier is varied in
accordance with the instantaneous value of the modulating signal

20
Q

a form of angle modulation where the phase of the carrier is varied in accordance with the instantaneous value of the modulating signal

A

Phase Modulation

communications 1 (7 decks)

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