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What are Broadcast television systems?

3 main analog television systems in use around the world until late 2010s

Now in digital television (DTV), there are four main systems in use around the world

found primarily in North America, some of South America, South Korea, Japan, Phillipines. • 525 Scan lines • 30 frames per second • 4:3 aspect ratio

found primarily in Europe, Brazil, Australia, New Zealand, South Africa, Hong Kong • 625 Scan lines • 25 frames per second

found primarily in France, Germany, Greece • 625 Scan lines • 25 frames per second • Sends color signals differently than the other two

Now that our television broadcast signals are becoming digital world-wide (some countries are still in the process of converting), the ___________, __________ & _______________ standard no longer apply - unless you're watching that old VHS copy of Goonies your parents still have lying around!

The switch from analog to digital broadcast television is known as

In 1996, the US Congress authorized the distribution of an additional broadcast channel to every full-power TV station so that each station could launch a __________________________ while simultaneously continuing analog broadcasting. Later, Congress set June 12, 2009 as the deadline for full power television stations to stop broadcasting _________________________. Countries are branching out with many more digital systems for broadcasting their signals

Interlaced scan

Progressive scan

You should look for a display with progressive scan if it fits into your budget, because the picture appears much smoother and more like a film. 1080i= 1080p=

Aspect Ratio

But where did it all begin? We owe the first aspect ratio to one man: __________________. Dickson worked at Thomas Edison's Lab as a staff photographer. Using 35mm film, Dickson settled on an image that was 4 perforations high - resulting in an image that was . 95" x .735" - a 4:3 aspect ratio (or 1.33 ratio). This stuck well into the 1950's until experiments with film and new cameras brought about several different ratios including 1.37, 2.59 and 2.35. In the 1980's, when HD television was being developed, industry leaders decided on a standard of ______.