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Guide: Prof. Utpal Pandya Made By: Nimish Sharma

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Flow:-

Types of tv

CRT and LCD TVs

Aspect ratio & Pixel count

Basic components of HDTV

Scanning

Refresh rate

Comparison

Why opt for HDTV?

Drawbacks

Summary

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Types ofTelevision

SDTV HDTV

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Cathode Ray Tube

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CONTINUED...

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LCD

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PLASMA TV

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Introduction HDTV

High Definition Television

Digital television broadcasting system

Research begins in 1980s First HDTV sets hit the market in 1998

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Basic Components ofHDTV system

1. HDTV Monitor2. HD satellite receiver3. Standard satellite dish4. HDMI cable

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BLOCKDIAGRAM

Display

Processor

Audio

Decoder

Image

Decoder

Demodulator Demultiplexer

Decoded

video

signals

Decoded

audio

signals

Display

format

video

signals

audio

signals

digital

signals

analog

carrier

+

digital

signals

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Aspect Ratio

Width-to-heightratio

Fovea has greaterarea along widththan height

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PixelCount

SDTV HDTV

704x480 1280x720p

1920x1080i

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Scanning

Interlaced:Redraws every secondline inone refreshand

remaining in secondrefresh

Progressive:Redraws allthe lines in eachrefresh

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SCAN

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SCAN

Interlaced scan splits each video frame into two "fields,"displaying all the even horizontal scan lines (2,4,6...) in1/60th of a second, followed by the odd scan lines(1,3,5...) during the next 1/60th of a second. That means

you'll see a complete video frame every 1/30th of asecond

Progressive scan, on the other hand, displays all the linesin a single sweep (1,2,3,4...). You'll see a complete frameevery 1/60th of a second.

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REFRESH RATE

Q: What is "120Hz refresh rate"?A: Picture tubes are progressive-scan by nature,displaying 60 video frames per second oftenreferred to as "60Hz." HDTVs with 120Hz refreshrate double the standard rate to 120 frames persecond. Because each video frame appears for onlyhalf the normal amount of time, on-screen motionlooks smoother and more fluid, with less motion blurand smearing. It's especially noticeable when

viewing fast-action sports and video games.

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REFRESH RATE- CRT

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REFRESH RATE- HDTV

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720p vs 1080i

1080p

1080i

720p

720i

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Comparison

Parameters SDTV HDTV

Pixel count 0.3 million 2.1 million

Aspect Ratio 4:3 16:9

Signal Format analog digital

Size bulky compact

Bandwidth 6MHz 7.5 to 15MHz

Audio Normal Dolby 5.1

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Why optforHDTV?

Wide screen format

Better Resolution

Quality of sound

Digital superiority

No more ghost images

Progressive scanning

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Drawbacks

Expensive

Need for a digital tuner

Analog signals are cohesive over a greater distance thanan equivalent digital signal

Requires more bandwidth

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Conclusion

HDTV gives Theatre likeexperience!

THANK YOU