Objectives Upon the completion of this topic the student will be able to explain Formation of picture Reproduction of Motion picture &TV picture C-O5/SDE-TV of 90 1

TELEVISION PICTURE FUNDAMENTALS

TRANSMITTER RECEIVER CHANNEL C-O5/SDE-TV of 90 3 Block Diagram of a Communication System

C-O5/SDE-TV of 90 4 TRANSMITTER RECEIVER CHANNEL Block Diagram of a Communication System

LINE (WIRE) COMMUNICATION WIRELESS COMMUNICATION C-O5/SDE-TV of 90 5 CLASSIFICATION

6 TRANSMITTER RECEIVER Co-axial Cable Examples of system are Telephony Telegraphy Line Communication System

C-O5/SDE-TV of 90 7 RECEIVERTRANSMITTER Wireless Communication System

AUDIO or SOUND SIGNALAUDIO or SOUND SIGNAL VIDEO or PICTURE SIGNALVIDEO or PICTURE SIGNAL C-O5/SDE-TV of 90 8 T.V. SIGNAL

SSB Suppressing LSB, loss of DC component i. loss of background information Suppressing USB, loss of high frequency components i.e. loss of finest details in the picture. TYPES OF AMPLITUDE MODULATION

AMPLITUDE MODULATIONAMPLITUDE MODULATION It is used for Picture FREQUENCY MODULATIONFREQUENCY MODULATION It is It is used for Sound C-O5/SDE-TV of TYPES OF MODULATION

Characteristics of human eye VISUAL ACUITY PERSISTENCE OF VISION BRIGHTNESS AND COLOUR SENSATION C-O5/SDE-TV of 90 11

VISUAL ACUITY It is the ability to resolve the finer details in a picture C-O5/SDE-TV of 90 12

PERSISTENCE OF VISION Property of the eye to retain its vision for sometime, after the source of light is removed. C-O5/SDE-TV of 90 13

Brightness & Colour Sensation Property of the eye to sense the brightness and colour variations in a picture. C-O5/SDE-TV of 90 14

NUMBER OF LINES SCANNING RATE SPECTRAL RESPONSE REQUIREMENTS C-O5/SDE-TV of IMPORTANT REQUIREMENTS OF SCANNING

VISUAL ACUITY Determines the number of lines PERSISTENCE OF VISION Determines the rate of scanning BRIGHTNESS AND COLOUR SENSATION Determines the spectral response requirements C-O5/SDE-TV of CHARACTERISTICS OF HUMAN EYE & REQUIREMENTS OF SCANNING

STILL PICTURE A still black and white picture is an fundamentally arrangement of many small dark and light areas, known as pixels or picture elements. C-O5/SDE-TV of 90 17

These black and white areas are converted into electrical currents and transmitted. The picture can be easily reproduced at receiver just by converting those electrical currents into corresponding picture information. C-O5/SDE-TV of 90 18

To transmit any picture, light information must be converted into electrical form by scanning method Picture scanning is similar to reading of a page from left to right and from top to bottom. C-O5/SDE-TV of 90 19

In TV system, CRT uses an electron beam to scan the picture details at every point on every line Each still picture can be considered as a frame C-O5/SDE-TV of 90 20

C-O5/SDE-TV of PICTURE Picture Reproduction is done by Duplicating its Picture Elements FORMATION OF PICTURE

C-O5/SDE-TV of PICTURE DIVIDED INTO ELEMENTS PIXEL Picture Reproduction by Duplicating its Picture Elements

SUMMARY We have discussed about FUNDAMENTALS OF TV FORMATION OF PICTURE C-O5/SDE-TV of 90 23

QUIZ C-O5/SDE-TV of 90 24

1.Pixel is a a. picture element b. sound element c. none C-O5/SDE-TV of 90 25

Frequently asked questions 1.What is persistence of vision? 2.Explain the formation of picture in Television. C-O5/SDE-TV of 90 26

THANK Q C-O5/SDE-TV of 90 27