Digital Communication Quiz

What does digital-to-analog conversion involve?

• Changing binary data into pulse code

• Changing characteristics of an analog signal

• Using analog data for digital output

• None of the above

Which of the following is not a characteristic of an analog signal?

• Amplitude

• Phase

• Frequency

• Bit rate

What is the smallest unit of data in digital communication?

• Signal element

• Data element

• Carrier

• Phase unit

A signal element can represent:

• Only 1 bit

• A byte

• One or more bits

• Only analog data

Baud rate refers to:

• Bits per second

• Signal elements per second

• Amplitude per second

• Number of frequencies used

What does the variable L represent in analog transmission?

• Signal rate

• Bit depth

• Number of distinct signal elements

• Bandwidth

What is the formula for r in the equation S=N/r?

• r=2L

• r=log2L

• r=N×L

• r=L

Increasing the value of L will:

• Decrease signal rate

• Increase signal rate

• Increase phase shift

• Decrease bit rate

The carrier frequency is:

• Always changing

• The base frequency for modulation

• Equal to the baud rate

• Equal to bit rate

Which of the following is not a purpose of modulation?

• Fit the signal into a bandpass channel

• Increase signal quality

• Transfer analog information

• Compress signal to reduce data