Analogue And Digital World ,public address system

Analogue Quantities

Definition:

Analogue
quantities are those quantities whose values increase or decrease continuously
with

time or remains constant are known as analogue quantities.

Example:

Temperature,
Time, Pressure, Distance etc.

Temperature- Time graph

Temperature of air varies continuously during 24 hours of a day.

Analogue Electronics:

The
part of electronics consisting of such circuits which process analogue
quantities is called Analogue electronics.

Example

Public
Address System is an example of analogue electronic

Analogue
Signal :

A continuously varying signal is called
an analogue signal

Signal
perceived by analogue electronics is called analogue signal

Example

If we plot temperature, time graph, for
different values then we get graph as shown

Public
Address System:

The
microphone converts sound energy into continuously varying electric potential.

 This potential is an analogue signal.

 This signal is applied to an electric
amplifier which is alsoanalogue
circuit, which amplifies the signal without changing its shape to such an
extent that it can operate the loud speaker. In this way loud sound is produced
out of the speaker.

Digital
Quantities:

"The
quantities whose values vary in non-continuous manner are called digital
quantities".

Digital quantities are expressed in the form of digits 0,1.

Digital Electronics:

"That
branch of electronics which provide the data in the form of maximum and minimum


voltage signal is known as digital electronics".

 OR

"The branch of electronics which deals with the digital quantities is
called digital electronics"

Analogue  to Digital 
Convertor (ADC):

A circuit which converts the analogue
signal into a digital one in the form of digits is known as

analogue to digital converter (ADC)".

Digital to Analogue Convertor
(DAC):

"The
circuit which converts the digital signal into analogue signal is called
digital to analogue

convertor (DAC).