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Modulation: Quiz

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Question 1: Automatic gain control, AGC (to compensate for ________, for example fading).
AttenuationTransparency and translucencyOptical fiberInverse-square law

Question 2: In ________ modulation, an analog carrier signal is modulated by a digital bit stream.
Digital audioDigitalDigital electronicsIntegrated circuit

Question 3: ________ (OFDM) modulation:
Orthogonal frequency-division multiplexingDigital Audio BroadcastingDigital radioDVB-SH

Question 4: ________ (AM) (here the amplitude of the carrier signal is varied in accordance to the instantaneous amplitude of the modulating signal)
Frequency-shift keyingFrequency modulationSingle-sideband modulationAmplitude modulation

Question 5: These are methods to transfer a digital bit stream over an analog ________ channel (a.k.a.
ModulationBasebandModemOrthogonal frequency-division multiplexing

Question 6: The three key parameters of a periodic waveform are its ________ ("volume"), its phase ("timing") and its frequency ("pitch"), all of which can be modified in accordance with a low frequency signal to obtain the modulated signal.
Crest factorAmplitudeElectrical engineeringMeasuring instrument

Question 7: In all of the above methods, each of these phases, frequencies or amplitudes are assigned a unique pattern of binary ________.
ByteCharacter (computing)BitRecord (computer science)

Question 8: Of the two kinds of RF power amplifier, switching amplifiers (________) cost less and use less battery power than linear amplifiers of the same output power.
Electronic amplifierBipolar junction transistorOperational amplifierDifferential amplifier

Question 9: See for example frequency modulation synthesis or ________.
SynthesizerRing modulationChick CoreaKarlheinz Stockhausen

Question 10: If the ________ (also known as the baud rate) is fS symbols/second (or baud), the data rate is NfS bit/second.
Symbol rateData transmissionModemModulation







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