Cisco DVR Installation Guide download pdf (Page 29)

Frequently Asked Questions

What Is Digital Television?

Digital television (DTV) is a huge leap forward in television technology compared to analog

television that has been widely available since the 1940s. DTV is delivered and displayed

using digital encoding, similar to the way a PC operates. By using digital technology, there

is no variation in picture and sound quality from the origination point until it is displayed on

your television. You always receive a high-quality picture without the wavy lines or static you

might sometimes get from a weak analog signal. Another feature of digital television is digital

surround sound using Dolby Digital technology, which is the same technology used to produce

the sound you hear in movie theaters.

What Is Standard-Deﬁ nition Television?

Standard-deﬁ nition television (SDTV) is basic digital television programming delivered by your

service provider. Typically, the SDTV screen is the same, nearly square shape as an analog

television screen. Digital images on an SDTV set are crisp and clear—noticeably better than on

a standard analog television set using an antenna to receive over-the-air signals.

What Is High-Deﬁ nition Television?

High-deﬁ nition television (HDTV) is a completely new way to send and receive television

broadcast signals. HDTV images are made up of pixels that are much smaller and closer

together than those used in standard analog television, and there are millions of them. Thus,

HDTV can display ﬁ ve to six times the detail of analog television to deliver picture quality that is

much more realistic, dimensional, and precise. SDTV programs can be viewed on an HDTV.

Are Local TV Stations or Other Programmers Broadcasting in HDTV?

Many local TV stations and programmers 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-deﬁ nition channels. Most stations

and programmers, once they begin broadcasting in digital, are offering HD content from

their parent network (for example, CBS, ABC, NBC, Fox, and PBS). Contact your service

provider for more information.

Why Aren’t All the Shows I Watch in High-Deﬁ nition?

A high-deﬁ nition program must originate in HD format and be broadcast in HD format.

Having an HDTV system does not mean that everything you watch will be viewed in high-

deﬁ nition. Getting the signal from a digital source also does not mean it is high-deﬁ nition.

Why Are Some HDTVs 4:3 Aspect Ratio and Others 16:9?

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

the middle of the screen. There are bars surrounding the picture.

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

What Is HDMI and Does it Support Dolby Digital 5.1 Audio?

The High-Deﬁ nition Multimedia Interface (HDMI) is an uncompressed, all-digital audio/

video interface. The Dolby Digital audio format that provides up to 5.1 separate channels

of surround sound, and is the standard used for DVD-Video. HDMI supports standard,

enhanced, or high-deﬁ nition video, plus multi-channel digital audio, such as Dolby Digital

audio, on a single cable.

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Cisco DVR Installation Guide Page 29

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