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Modulation does not permit frequency division multiplexing.

A) True
B) False

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The ________ rate,expressed in baud,is the rate at which the signal level is changed.

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The basis for ________ signaling is a continuous constant frequency signal known as the carrier signal.

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Using two different voltage levels for the two binary digits is a difficult way to transmit digital signals.

A) True
B) False

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In ________ signaling an analog or digital data source is encoded into a digital signal.


A) polar
B) carrier
C) analog
D) digital

E) A) and D)
F) C) and D)

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A common encoding technique in which each of the two modulated streams is a BPSK signal at half the data rate of the original bit stream is ________.The combined signals have a symbol rate that is half the input bit rate.


A) MPSK
B) MFSK
C) QPSK
D) QAM

E) A) and B)
F) C) and D)

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In the differential ________ scheme a binary 0 is represented by sending a signal burst of the same phase as the previous signal burst sent.A binary 1 is represented by sending a signal burst of opposite phase to the preceding one.

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phase shif...

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The modulation rate of a signal is the rate,in bits per second,that data are transmitted.

A) True
B) False

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A popular analog signaling technique that is used in the asymmetric digital subscriber line is ________ modulation.

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Quadrature...

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In ________ the phase of the carrier signal is shifted to represent data.


A) MFSK
B) ASK
C) FSK
D) PSK

E) C) and D)
F) A) and B)

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Analog data in electrical form can be transmitted as ________ signals easily and cheaply with voice transmission over voice grade lines.


A) carrier
B) broadband
C) baseband
D) modulating

E) C) and D)
F) All of the above

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Some transmission media,such as optical fiber and unguided media,will only propagate analog signals.

A) True
B) False

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The process of converting analog data into digital data is known as ________.

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The three basic encoding or modulation techniques for transforming digital data into analog signals are amplitude shift keying,phase shift keying,and ________.

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frequency ...

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In the ________ scheme,a binary 0 is represented by no line signal and a binary 1 is represented by a positive or negative pulse.The binary 1 pulses must alternate in polarity.

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If digital signaling elements all have the same algebraic sign,all positive or all negative,then the signal is ________.


A) polar
B) unipolar
C) baseband
D) differential

E) A) and B)
F) None of the above

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Because of their simplicity and relatively low frequency response characteristics,________ codes are commonly used for digital magnetic recording.


A) NRZ
B) AMI
C) VSES
D) B8ZS

E) B) and C)
F) A) and B)

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Amplitude shift keying is less susceptible to error than binary frequency shift keying.

A) True
B) False

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There is a transition at the middle of each bit period in the ________ biphase coding technique.The midbit transition serves as a clocking mechanism and also as data.A low-to-high transition represents a 1,and a high-to-low transition represents a 0.

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The simplest form of digital encoding of ________ is to assign one voltage level to binary- one and another to binary-zero.


A) digital data
B) carrier data
C) AM data
D) analog data

E) C) and D)
F) B) and C)

Correct Answer

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