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Exam 5: Signal Encoding Techniques

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Question 21

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Modulation does not permit frequency division multiplexing.

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B) False

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Question 22

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

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Question 23

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

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

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

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.

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.

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

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

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

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

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

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

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

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.

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

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

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

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.

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