General presentation

GENERAL PRESENTATION

PANKAJ SINGH JARIALROLL NO: B2703B-TECH(IT)MBA

Television

PRINCIPLE

If you divide a still image into a collection of small colored dots, your brain will reassemble the dots into a meaningful image.

If we show the still images in rapid succession, the brain will reassemble the still images into a single, moving scene

TV STEERING COIL

IMAGE PAINTINGRaster scan

Interlacing Progressive scanning

VEDIO

BROADCASTING SIGNALS

Intensity information Horizontal-retrace signals Vertical-retrace signals

SIGNAL HENCE CALLED AS COMPOSITE VEDIO SIGNAL

SIGNAL CONTAIN ??

BLACK AND WHITE

COLORED SIGNAL

luma represents the brightness in an image Luma is typically paired with chroma Luma represents the achromatic image

without any color, while the chroma components represent the color information

CHROMA AND LUMA

COLOR SUBSAMPLING

Conventional CRT sets display around 480 visible lines of pixels.

Analog pictures are interlaced Converting video to analog format lowers its

quality worst computer monitors have more

resolution than the best analog TV The best computer monitors are able to

display up to 10 times more pixels than that TV set

WHATS WRONG WITH ANALOG TV

Different frequency for digital broadcast Each broadcaster has an analog TV channel

and a digital TV channel A broadcaster can send a single program at

19.39 Mbps A broadcaster can divide the channel into

several different streams

DTV

480i - The picture is 704x480 pixels, sent at 60 interlaced frames per second (30 complete frames per second).

480p - The picture is 704x480 pixels, sent at 60 complete frames per second.

720p - The picture is 1280x720 pixels, sent at 60 complete frames per second.

1080i - The picture is 1920x1080 pixels, sent at 60 interlaced frames per second (30 complete frames per second).

1080p - The picture is 1920x1080 pixels, sent at 60 complete frames per second.

Different formats