Question 1

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 dBE) B) and C)
F) A) and D)

Question 2

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)   parityE) C) and D)
F) None of the above

Question 3

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 + 1E) None of the above
F) A) and B)

Question 4

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

Accepted Answer

A)   4
B)   3
C)   2
D)   1E) C) and D)
F) A) and D)

Question 5

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 16550AE) A) and C)
F) B) and C)

Question 6

Reed-Solomon codes are

Accepted Answer

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

Question 7

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 timeE) A) and B)
F) A) and C)

Question 8

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 bitsE) A) and D)
F) B) and C)

Question 9

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

Question 10

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 criteriaE) B) and D)
F) A) and B) B

Question 11

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

Accepted Answer

A)   10
B)   6
C)   13
D)   16E) B) and C)
F) None of the above

Question 12

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 quantizerE) All of the above
F) B) and D)

Question 13

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 levelsE) B) and C)
F) A) and B)

Question 14

Which of the following is a baseband type of signal?

Accepted Answer

A)   PAM
B)   RZ
C)   PWM
D)   PCME) A) and C)
F) B) and C) B

Question 15

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

Accepted Answer

A)   RZ
B)   NRZ
C)   Multilevel binary codes
D)   Manchester codingE) A) and D)
F) B) and D)

Question 16

The logical distance between defined states is called

Accepted Answer

A)   Viterbi distance
B)   binary distance
C)   hamming distance
D)   none of the aboveE) None of the above
F) C) and D)

Question 17

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

Question 18

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

Question 19

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 orderE) A) and B)
F) None of the above C

Question 20

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 aboveE) A) and B)
F) A) and C)

Exam 8: Digital Communications: Coding Techniques

Find the dynamic range of a PCM system of 16 bits

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Reed-Solomon codes are

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A non-recursive filter is an

Correct AnswerverifiedShow Answer

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:

Correct AnswerverifiedB

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is a baseband type of signal?

Correct AnswerverifiedB

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

Correct AnswerverifiedShow Answer

The logical distance between defined states is called

Correct AnswerverifiedShow Answer

Which of the following is an application of PCM?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

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B

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B

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C

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