Computer Studies Made Simple : Signals and its types

Signal:

A signal is a wave that is used to transfer data from one place to another through a medium of communication.

It may be an electromagnetic wave or a light wave.

Forms of Signals:

The signal may be one of the following types:

1.Digital signal

This is in the form of electrical pulses that may be in On or Off form.

This represents the chief form of communication between all computers.

It is transmitted in the form of discrete bundles.

They have low rates of error and transfer data efficiently.

Digital Signal

2.Analog Signal

This signal is in a continuous form and is known as a carrier wave.

Some examples of data communication by this method include:

Light,sound and telephone communication.

Analog Signal

Frequency:

This refers to the number of time a wave passes through a point reference in a specific duration of time.

Amplitude:

This is defined as the height of wave during a given time period.