Communication System

Question 1

Analog signal

Answer 1

A signal with an amplitude that varies continuously for all time.

Question 2

Digital signals

Answer 2

Signals obtained when discrete time signals are quantized and then coded

Question 3

Modulation

Answer 3

The process by which some characteristics of a carrier wave is varied in accordance with a modulating wave.

Question 4

Transmitter

Answer 4

The portion which processes the message signal in a form suitable for transmission over the channel

Question 5

Communication channel

Answer 5

The function of the channel is to provide a physical connection between the transmitter output and the receiver input.

Question 6

Receiver

Answer 6

This portion processes the received signal to get message signal. Such an operation is called demodulation.

Question 7

Digital communication system

Answer 7

Meant to transmit information that can be either analog signals or sequence of symbols in digital form coming out from a source to a pre-assigned destination with maximum possible rate and accuracy

Question 8

Source

Answer 8

Where the information to be transmitted originates

Question 9

Source encoder

Answer 9

Converts the analog signals or sequence symbols into binary sequences of 1’s and 0’s

Question 10

Source decoder

Answer 10

Converts the binary output of the channel decoder into its original analog form or sequence of symbols

Question 11

Channel encoder

Answer 11

Adds some error control bits to the bit streams of source encoder output

Question 12

Channel decoder

Question 13

Channel modulator

Answer 13

Converts bit streams from channel encoder to electrical waveform suitable for transmission over communication channel

Question 14

Channel demodulator

Answer 14

Converts received signal into sequence of bits with minimum error and maximum efficiency

Question 15

Channel

Answer 15

A physical media

Question 16

Optical fibre

Answer 16

Flexible optically transparent fibre through which light can be transmitted by successive total internal reflections

Question 17

Electromagnetic wave

Answer 17

A wave of energy having a frequency within the electromagnetic spectrum and propagated as a periodic disturbance of the electromagnetic field when an electric charge oscillates or accelerates

Question 18

Antenna

Answer 18

A structure that is generally a metallic object, often a wire or group of wires, used to convert high frequency current into electromagnetic waves, and vice-versa

Question 19

Broadcasting

Answer 19

The distribution of audio and/or video signals that is used to transmit programs to an audience.

Question 20

Internet

Answer 20

Global system of interconnected computer networks that use the standard internet protocol suite to serve billions of users worldwide.

Question 21

Intranet

Answer 21

Generic term used for a collection of private computer networks within an organization