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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