CN7 Analogue and Digital Signal

Draw, how information is transmitted in analog format

Draw, how information is transmitted in digital format

On the Internet, the source and destination of information are a pair of _____.

• application programs
• terminals
• network devices
• nodes

Computer and data communication differs from one another as the former deals with ______ issues.

• none of the options
• computer
• lower-layer
• higher-layer

An analog signal is characterised by a ____ signal.

• discrete
• 1s and 0s
• continuous
• fixed

A digital signal has a ______ set of valid levels.

• variable
• fixed
• continuous
• none of the options

Much analysis in data communication involves using ______ trigonometric functions.

• complex
• quadratic
• sinusoidal
• simple

When a microphone picks up ___ tone, the output is a sine.

• inaudible
• cracking
• audible
• slient

Define frequency in relation to sine waves.

• how far the start of the sine wave shifted from a reference time
• length of a cycle as a signal propagates across a medium
• difference between maximum and minimum signal heights
• number of oscillations per unit time

Signals are classified as ____ when they can be decomposed into a set of simple sine waves

• digital
• none of the options
• composite
• analog