Question 1

In which of the following is the sample signal voltage held constant between samples?

Accepted Answer

A)  natural sampling 
B)  sample and hold 
C)  flat-top sampling 
D)  none of the above 
A)  natural sampling 
B)  sample and hold 
C)  flat-top sampling 
D)  none of the above

Question 2

The type of PCM coding scheme that is popular in optical systems, satellite telemetry links, and magnetic recording systems is:

Accepted Answer

A)  phase-encoded and delay modulation 
B)  RZ - return to zero 
C)  NRZ - non-return to zero 
D)  multilevel binary 
A)  phase-encoded and delay modulation 
B)  RZ - return to zero 
C)  NRZ - non-return to zero 
D)  multilevel binary

Question 3

An early alphanumeric 5-bit code that was developed in the days of teletype machines that has limited power is known as:

Accepted Answer

A)  the Baudot code 
B)  EBCDIC 
C)  ASCII 
D)  the Gray code 
A)  the Baudot code 
B)  EBCDIC 
C)  ASCII 
D)  the Gray code

Question 4

An alias signal is:

Accepted Answer

A)  a signal that has a frequency equal to the difference between the applied analog frequency and the sampling frequency. 
B)  usually filtered out by anti-aliasing filters in PCM systems 
C)  a signal that forms in a PCM system that has failed to meet the Nyquist sampling rate 
D)  all of the above 
A)  a signal that has a frequency equal to the difference between the applied analog frequency and the sampling frequency. 
B)  usually filtered out by anti-aliasing filters in PCM systems 
C)  a signal that forms in a PCM system that has failed to meet the Nyquist sampling rate 
D)  all of the above

Question 5

The distance of a received code (00111) from a valid code of (00101);

Accepted Answer

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

Question 6

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

Accepted Answer

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

In which of the following is the sample signal voltage held constant between samples?

The type of PCM coding scheme that is popular in optical systems, satellite telemetry links, and magnetic recording systems is:

An early alphanumeric 5-bit code that was developed in the days of teletype machines that has limited power is known as:

An alias signal is:

The distance of a received code (00111) from a valid code of (00101);

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

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

In which of the following is the sample signal voltage held constant between samples?

The type of PCM coding scheme that is popular in optical systems, satellite telemetry links, and magnetic recording systems is:

An early alphanumeric 5-bit code that was developed in the days of teletype machines that has limited power is known as:

An alias signal is:

The distance of a received code (00111) from a valid code of (00101);

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

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