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 Amplitude Modulation: Analog Communication 50 Flashcards |
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What is the process of shifting the frequency spectrum of a message signal to a different frequency range called? |
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Modulation |
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True or False: In amplitude modulation, the frequency and phase of the carrier signal vary while the maximum amplitude remains constant. |
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False. In amplitude modulation, the maximum amplitude varies according to the instantaneous value of the information signal. |
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Fill in the blank: The bandwidth of an amplitude modulated signal is given by BW = (fc + fm) - (fc - fm) = ______. |
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2fm |
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Riddle: I can be high or low, but in the end, I always follow the signal's flow. What am I? |
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Carrier frequency |
Card: 8 / 50 |
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Which modulation technique results in the highest efficiency with no carrier transmitted? |
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Single Sideband Suppressed Carrier (SSBSC) |
Card: 10 / 50 |
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True or False: The total power of an amplitude modulated wave is equal to the sum of the carrier power and the sideband power. |
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True |
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The process of recovering the original modulating signal from a modulated carrier wave is called ______. |
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Demodulation |
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Which of the following is a method of amplitude modulation? A) Frequency Modulation B) Phase Modulation C) Single Sideband Modulation D) Pulse Modulation |
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C) Single Sideband Modulation |
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Fill in the blank: The device used to generate an amplitude modulated wave is known as the ______. |
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Amplitude modulator |
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Riddle: I'm the unwanted guest in a signal's journey, causing distortion and interference on my way. What am I? |
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Noise |
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Which modulation technique transmits only one sideband and suppresses the carrier? |
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Single Sideband Modulation (SSB) |
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True or False: The efficiency of amplitude modulation can exceed 100%. |
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False. The maximum efficiency of amplitude modulation is 100%. |
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The modulation index in an amplitude modulation system is defined as the ratio of ______. |
Card: 25 / 50 |
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The maximum amplitude of the modulating signal to the amplitude of the carrier signal |
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Fill in the blank: The significant frequency range of an amplitude modulated signal has an upper sideband from fc to ______. |
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Fc + fm |
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What is the term for a signal that has a constant frequency and carries information? |
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Carrier signal |
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Which of the following is not a type of amplitude modulation? A) Double Sideband Modulation B) Vestigial Sideband Modulation C) Quadrature Amplitude Modulation D) Frequency Modulation |
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D) Frequency Modulation |
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Riddle: I carry information without noise, but with me, power is never a waste. What am I? |
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Single Sideband Modulation (SSB) |
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True or False: The output of an envelope detector can be a distorted version of the original signal. |
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True |
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Fill in the blank: The maximum power dissipated in an amplitude modulated wave occurs at a modulation index of ______. |
Card: 37 / 50 |
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1 |
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What is the term for the difference between the highest and lowest frequencies in a signal's spectrum? |
Card: 39 / 50 |
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Bandwidth |
Card: 40 / 50 |
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Which modulation technique uses two message signals transmitted over the same spectrum? |
Card: 41 / 50 |
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Quadrature Amplitude Modulation (QAM) |
Card: 42 / 50 |
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Fill in the blank: The essential parameter for suitable transmission in communication channels is ______. |
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Bandwidth |
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Which of the following describes the modulation technique that combines amplitude and phase variations? A) Frequency Modulation B) Amplitude Modulation C) Phase Modulation D) Quadrature Amplitude Modulation |
Card: 45 / 50 |
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D) Quadrature Amplitude Modulation |
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True or False: The superheterodyne receiver uses a local oscillator to mix the incoming signal with the carrier signal. |
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True |
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Fill in the blank: The superheterodyne receiver allows for ______ selectivity by converting the incoming signal to a fixed intermediate frequency. |
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Improved |
Card: 50 / 50 |
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