Magnavox50 DLP HDTV

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HDTV stands for high-definition television. HDTV is ideally suited for viewing movies and sports, as more of the action is visible, and is in superior detail, it has transformed the traditional narrow NTSC “window” onto a sports field into a stadium experience in the living room.

HDTV Statement:

Where an original analog cable set-top box is already required this has to be replaced to receive digital cable. From a user's point of view the main advantage appears to be simply better picture quality and more channel availability, however (depending on the choices operators make regarding set-top box hardware and middleware software) many other features become possible with the transfer away from analog.

Often a TV guide (seven-day schedules) with extended information can be viewed, reminders to watch programs can be set and advanced parental censorship on channel content can be exercised. Operators also enjoy better CA (conditional access) on digitally transmitted streams as they can be sent "encrypted" with schemes such as DES encryption to help prevent unauthorized access and protect revenues.

Photographic film destined for the theater typically has a high resolution and is photographed at 24 frame/s. Depending on the available bandwidth and the amount of detail and movement in the picture, the optimum format for video transfer is thus either 720p24 or 1080p24. When shown on television in countries using PAL, film must be converted to 25 frames per second by speeding it up by 4%.

In countries using the NTSC standard, (60 fps) a technique called 3:2 pulldown is used. One film frame is held for three video fields, (1/20 of a second) and then the next is held for two video fields (1/30 of a second) and then the process repeats, thus achieving the correct film rate with two film frames shown in 1/12 of a second.