Cisco Explorer 8300 Uživatelská příručka stáhnout pdf (Strana 39)

QUESTIONS ABOUT HDTV PROGRAMS

Q. Are local TV stations broadcasting in HDTV?

A. Many local TV stations and other programmers are transmitting digital signals.

However, transmitting a digital signal does not mean transmitting an HDTV

signal. Most stations, however, once they begin broadcasting in digital are

offering HD programs from their parent station, such as CBS, ABC, NBC, Fox,

WB, UPN, or PBS.

Q. How can I find out which programs are broadcast in HD?

A. To find out which programs are broadcast in HD, log on to the Web site of your

service provider. Many service providers list their channel lineups on their Web

sites and indicate the channels that are broadcast in HD.

Q. Why are some HDTVs 4:3 Aspect Ratio and Others 16:9?

A. The aspect ratios differ because television manufacturers build both standard-

screen and wide-screen HDTVs to appeal to consumer viewing preferences. The

two aspect ratios are as follows:

• On wide-screen (16:9) HDTVs, the programming is displayed on the full screen.

• On standard-screen (4:3) HDTVs, the programming is displayed in letterbox

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

Q. What are the differences between standard TVs and HDTVs?

A. • HDTVs can be 1/3 wider than traditional TVs, although some HDTVs have a

traditional (4:3 aspect ratio).

• HDTV uses a much finer resolution to create the TV picture—1125 lines for

HDTV as compared to 525 lines used in standard TV (SDTV). This means that

the resolution for HDTVs can be up to 1920 x 1080 pixels as compared with

720 x 480 for SDTVs.

• In the United States, HDTV is always broadcast with digital signals. SDTV is

currently broadcast in both digital and analog. (However, HDTV and digital

SDTV do not use the same digital signal.)

• Generally, all HDTV-ready monitors or integrated HDTV sets are capable of

supporting an SDTV 480i or 480p signal. Not all HDTV monitors support both

720p and 1080i HDTV signals. For instance, some plasma displays support

only 720p.

Q. I have a wide-screen HDTV and am tuned to a channel that is listed as an

HD channel, but the picture is not displayed in a wide-screen format. What’s

wrong?

A. The program may not be an HD program. Not all stations broadcast HD programs.

Because non-HD programs do not use a wide format, the picture does not fill the

width of the screen. To fill the space, the DVR automatically places bars on the

sides of non-HD programs. You can change this display to one that removes the

bars and fills the screen with the picture.

Q. I’m concerned about burn in. Can I remove the bars that display when

watching certain programs on my HDTV?

A. Yes. You can remove the bars and enlarge or stretch the picture to fill the screen.

If you have a standard-screen HDTV, you might try removing the bars by

displaying the program in a different picture format.

Burn in or “ghosting” occurs when an image is displayed on a TV for an extended

period of time. Through time, the image becomes permanently burned into the

screen, leaving a faint image of it on the screen. Some kinds of HDTVs are more

susceptible to burn in than others. For other ways to reduce burn in, refer to the

user’s guide that came with your HDTV.

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Související produkty a manuály pro Digitální videorekordéry (DVR) Cisco Explorer 8300