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Hey Ray! How Broadcasting A TV Signal Works – CBS Pittsburgh – Pittsburgh, Pennsylvania

Pittsburgh, Pennsylvania 2021-05-08 05:38:28 –

Pittsburgh (KDKA) —For most of us, television has existed for most of our lives. When you click on the remote control, information and entertainment will be displayed in front of you. But much is done to make that seemingly easy thing to do.

(Photo provider: KDKA)

To find out how it works, we talked to Todd Harbaugh, Director of Broadcast Operations and Engineering at KDKA-TV.

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Ray Peterin: How does the TV work?

Todd Harbaugh: Therefore, when you provide KDKA-TV to your viewers, it will start in the studio. Let’s say Ray is displayed on a green screen on a weather wall.

(Photo provider: KDKA)

Ray stands in front of a blank green screen that uses the video switcher behind me to electronically insert an image of the weather forecast computer behind me.

(Photo provider: KDKA)

The camera takes the image and the switcher electronically adds a weather graphic behind him.

(Photo provider: KDKA)

It then sends all that video to what’s called an encoder.

The video encoder signal is then transmitted over a fiber optic strand to a transmitter five miles from downtown Pittsburgh.

Its fiber optic strands are about 1/11 the thickness of human hair.

(Photo provider: KDKA)

From there, the signal enters the so-called exciter of the transmitter.

The exciter receives the video signal we send and then creates an RF modulated signal.

The RF modulated signal then moves to the top of the tower (about 650 feet in the air) that you may have seen on TV in the past week, and you watch the RF signal all at home via outdoor waves. Broadcast to people.

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(Photo provider: KDKA)

Elizabeth Peterin: How long does it take for it all to happen?

Harbaugh: Overall, it takes about 3-4 seconds.

When KDKA-TV News starts at 6 o’clock, it actually starts at 5:59:56. For example, it takes about 4 seconds to reach everyone in the house.

Well, cables and satellites are a little different.

These systems do some additional processing at the end, which takes about 15 seconds.

Elizabeth: Wow! It’s fast.

Ray: surely! I heard about the new transmitter. What will be possible with television broadcasting in the future?

Harbaugh: In the future, what we think we will start watching on TV is the next generation of TV, ATSC 3.0.

This is a new type of television that allows you to actually receive KDKA directly on your mobile phone as a wireless broadcast.

(Photo provider: KDKA)

Currently, ATSC 3.0 is in development and there are few mobile phones on the market that can accept or display it, but that’s what will happen in the future.

ATSC 3.0 is also capable of 4K transmission. For those familiar with 4K transmission, this is a much higher resolution than the 1920 x 1080 HD currently in use.

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4K has a lot of bandwidth complexity, so I think it will take some time to see broadcasters push it forward.

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