Cisco Explorer 3240HD User's Guide download pdf (Page 26)

Many local TV stations are transmitting digital signals. However,

transmitting a digital signal does not mean transmitting an HDTV signal.

Some stations are using the new bandwidth to broadcast several

standard-definition channels. Most stations however, once they begin

broadcasting in digital, are offering HD content from their parent network

(for example, CBS, ABC, NBC, Fox, WB, UPN, PBS).

Are Local TV

Stations

Broadcasting in

HDTV?

Why Are Some

HDTVs 4:3 Aspect

Ratio and Others

16:9?

The aspect ratios differ because the television industry manufactures both

standard and wide-screen HDTVs to appeal to consumer viewing

preferences.

• On wide-screen HDTVs, the programming is displayed on the full

screen.

• On standard HDTVs, the programming is displayed in letterbox format

in the middle of the screen. (There are bars surrounding the picture.)

Frequently Asked Questions About HDTV

A standard-screen HDTV has

a 4:3 aspect ratio. The screen

is 4 units wide for every 3 units

tall.

A wide-screen HDTV is one-third

wider than a standard-screen

HDTV. The screen is 16 units

wide for every 9 units tall.

Aspect Ratio: 4:3

Screen Resolution:

480p or 480i

fills the screen

Aspect Ratio: 16:9

Screen Resolution:

720p or 1080i

fills the screen

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Cisco Explorer 3240HD User's Guide Page 26