Question 1

Which of the following is a baseband type of signal?

Accepted Answer

A)  PAM 
B)  RZ 
C)  PWM 
D)  PCM 
A)  PAM 
B)  RZ 
C)  PWM 
D)  PCM B

Question 2

The rule that a signal sampled at a minimum of twice the rate of its highest significant frequency component can be fully reconstructed at the receiver with a high degree of accuracy is known as:

Accepted Answer

A)  the Shannon-Hartley theorem 
B)  Nyquist criteria 
C)  the error algorithm 
D)  Barkenhausen criteria 
A)  the Shannon-Hartley theorem 
B)  Nyquist criteria 
C)  the error algorithm 
D)  Barkenhausen criteria B

Question 3

What is the order of a difference equation that requires three past input and output values?

Accepted Answer

A)  second order 
B)  fourth order 
C)  third order 
D)  first order 
A)  second order 
B)  fourth order 
C)  third order 
D)  first order C

Question 4

The logical distance between defined states is called

Accepted Answer

A)  Viterbi distance 
B)  binary distance 
C)  hamming distance 
D)  none of the above 
A)  Viterbi distance 
B)  binary distance 
C)  hamming distance 
D)  none of the above

Question 5

The phenomenon associated with the generation of an erroneously created signal in the sampling process is called:

Accepted Answer

A)  fold over distortion 
B)  aliasing 
C)  both A and B 
D)  none of the above 
A)  fold over distortion 
B)  aliasing 
C)  both A and B 
D)  none of the above

Question 6

A popular serial data communication standard used on computers to connect to a mouse

Accepted Answer

A)  RS-435 
B)  RS-232 
C)  IEEE-488 
D)  UART 16550A 
A)  RS-435 
B)  RS-232 
C)  IEEE-488 
D)  UART 16550A

Question 7

The number of bits required for a binary code to represent 305 different possibilities is

Accepted Answer

A)  8 bits 
B)  2 bits 
C)  9 bits 
D)  3 bits 
A)  8 bits 
B)  2 bits 
C)  9 bits 
D)  3 bits

Question 8

A non-recursive filter is an

Accepted Answer

A)  algorithm that does not include previous output values to generate the current output 
B)  algorithm that includes the previous output values to generate the current output 
C)  algorithm that includes the previous and present output values to generate the current output 
D)  algorithm that includes the previous and present output values to generate the current output. 
A)  algorithm that does not include previous output values to generate the current output 
B)  algorithm that includes the previous output values to generate the current output 
C)  algorithm that includes the previous and present output values to generate the current output 
D)  algorithm that includes the previous and present output values to generate the current output.

Question 9

Reed-Solomon codes are

Accepted Answer

A)  seldom used 
B)  also called CRC codes 
C)  forward error-correcting 
D)  none of the above 
A)  seldom used 
B)  also called CRC codes 
C)  forward error-correcting 
D)  none of the above

Question 10

Find the generating polynomial for a generating function of 1100111 for an 8-bit message

Accepted Answer

A)  X^6 + X^4 + X^3 + X + 1 
B)  X^7 + X^4 + X^2 + 1 
C)  X^6 + X^5 + X^2 + X + 1 
D)  X^7 + X^5 + X^3 + 1 
A)  X^6 + X^4 + X^3 + X + 1 
B)  X^7 + X^4 + X^2 + 1 
C)  X^6 + X^5 + X^2 + X + 1 
D)  X^7 + X^5 + X^3 + 1

Question 11

Find the dynamic range of a PCM system of 16 bits

Accepted Answer

A)  48.16 dB 
B)  24.08 dB 
C)  12.04 dB 
D)  96.32 dB 
A)  48.16 dB 
B)  24.08 dB 
C)  12.04 dB 
D)  96.32 dB

Question 12

The varying amplitude values which are used in order to code an analog intelligence signal in a PCM system are called

Accepted Answer

A)  compression levels 
B)  companding levels 
C)  quantizing levels 
D)  sample levels 
A)  compression levels 
B)  companding levels 
C)  quantizing levels 
D)  sample levels

Question 13

Which of the following error detection schemes does not require retransmission of the data for correction to occur?

Accepted Answer

A)  cyclic redundancy check 
B)  block check character 
C)  Hamming code 
D)  parity 
A)  cyclic redundancy check 
B)  block check character 
C)  Hamming code 
D)  parity

Question 14

A single LSI integrated circuit that contains the A/D and D/A circuitry in a PCM system is known as:

Accepted Answer

A)  a repeater 
B)  a time-division multiplexer 
C)  a codec 
D)  a quantizer 
A)  a repeater 
B)  a time-division multiplexer 
C)  a codec 
D)  a quantizer

Question 15

To achieve a dynamic range of 78 dB, how many bits will be used?

Accepted Answer

A)  10 
B)  6 
C)  13 
D)  16 
A)  10 
B)  6 
C)  13 
D)  16

Question 16

Given a (7,4) cyclic code, the length of the BCC is

Accepted Answer

A)  4 
B)  3 
C)  2 
D)  1 
A)  4 
B)  3 
C)  2 
D)  1

Question 17

The time that the sample and hold circuit must hold the sampled voltage

Accepted Answer

A)  sample time 
B)  acquisition time 
C)  hold time 
D)  aperture time 
A)  sample time 
B)  acquisition time 
C)  hold time 
D)  aperture time

Question 18

Which coding is commonly used as Ethernet for local area networks?

Accepted Answer

A)  RZ 
B)  NRZ 
C)  Multilevel binary codes 
D)  Manchester coding 
A)  RZ 
B)  NRZ 
C)  Multilevel binary codes 
D)  Manchester coding

Question 19

The amount of time it takes the hold capacitor in A/D system to reach its final value

Accepted Answer

A)  sample time 
B)  acquisition time 
C)  aperture time 
D)  hold time 
A)  sample time 
B)  acquisition time 
C)  aperture time 
D)  hold time

Question 20

Which of the following is an application of PCM?

Accepted Answer

A)  telephone systems 
B)  CD laser disks 
C)  digital audio recording 
D)  all of the above 
A)  telephone systems 
B)  CD laser disks 
C)  digital audio recording 
D)  all of the above

Which of the following is a baseband type of signal?

The rule that a signal sampled at a minimum of twice the rate of its highest significant frequency component can be fully reconstructed at the receiver with a high degree of accuracy is known as:

What is the order of a difference equation that requires three past input and output values?

The logical distance between defined states is called

The phenomenon associated with the generation of an erroneously created signal in the sampling process is called:

A popular serial data communication standard used on computers to connect to a mouse

The number of bits required for a binary code to represent 305 different possibilities is

A non-recursive filter is an

Reed-Solomon codes are

Find the generating polynomial for a generating function of 1100111 for an 8-bit message

Find the dynamic range of a PCM system of 16 bits

The varying amplitude values which are used in order to code an analog intelligence signal in a PCM system are called

Which of the following error detection schemes does not require retransmission of the data for correction to occur?

A single LSI integrated circuit that contains the A/D and D/A circuitry in a PCM system is known as:

To achieve a dynamic range of 78 dB, how many bits will be used?

Given a (7,4) cyclic code, the length of the BCC is

The time that the sample and hold circuit must hold the sampled voltage

Which coding is commonly used as Ethernet for local area networks?

The amount of time it takes the hold capacitor in A/D system to reach its final value

Which of the following is an application of PCM?

Introductory Topics

Amplitude Modulation: Transmission

Amplitude Modulation: Reception

Single-Sideband Communications

Frequency Modulation: Transmission

Frequency Modulation: Reception

Communications Techniques

Wired Digital Communications

Wireless Digital Communications

Network Communications

Transmission Lines

Wave Propagation

Antennas

Waveguides and Radar

Microwaves and Lasers

Television

Fiber Optics

Filters

Exam 8: Digital Communications: Coding Techniques

Which of the following is a baseband type of signal?

The rule that a signal sampled at a minimum of twice the rate of its highest significant frequency component can be fully reconstructed at the receiver with a high degree of accuracy is known as:

What is the order of a difference equation that requires three past input and output values?

The logical distance between defined states is called

The phenomenon associated with the generation of an erroneously created signal in the sampling process is called:

A popular serial data communication standard used on computers to connect to a mouse

The number of bits required for a binary code to represent 305 different possibilities is

A non-recursive filter is an

Reed-Solomon codes are

Find the generating polynomial for a generating function of 1100111 for an 8-bit message

Find the dynamic range of a PCM system of 16 bits

The varying amplitude values which are used in order to code an analog intelligence signal in a PCM system are called

Which of the following error detection schemes does not require retransmission of the data for correction to occur?

A single LSI integrated circuit that contains the A/D and D/A circuitry in a PCM system is known as:

To achieve a dynamic range of 78 dB, how many bits will be used?

Given a (7,4) cyclic code, the length of the BCC is

The time that the sample and hold circuit must hold the sampled voltage

Which coding is commonly used as Ethernet for local area networks?

The amount of time it takes the hold capacitor in A/D system to reach its final value

Which of the following is an application of PCM?

Introductory Topics

Amplitude Modulation: Transmission

Amplitude Modulation: Reception

Single-Sideband Communications

Frequency Modulation: Transmission

Frequency Modulation: Reception

Communications Techniques

Wired Digital Communications

Wireless Digital Communications

Network Communications

Transmission Lines

Wave Propagation

Antennas

Waveguides and Radar

Microwaves and Lasers

Television

Fiber Optics

Filters