What is HDTV?

HDTV means high -resolution TV , a new means of broadcasting and machines that use it. HDTV broadcasts video digitally, unlike conventional PAL, NTSC and Secam analog formats. HDTVS was first available in 1998. Since then, television manufacturers have been doing as much as possible to encourage their customers to buy HDTV for their next television.

HDTV requires HDTV tuner to pick up high -resolution programming. They typically run about $ 150 (USD) and are compatible with any HDTV. Some HDTVs come with built -in tuners.

HDTV is defined as 1080 active pixels and screen with a length ratio to a height of 16: 9. This screen shape leaves for decades 4: 3. The HDTV resolution is about twice as high as the typical CRT sets, which have 1080 instead.

E HDTV. Because the image is more digital than analog, it tends to be muchsharper on TVs of all sizes. Its image display technology is more "progressive" than "interlaced", which means that the whole image is constantly displayed, rather than alternating between partial visual displays as in conventional television. Pixels and low refresh frequencies are responsible for the flashing effect observed on older televisions.

HDTV was slowly caught. The sets are still very expensive in the neighborhood of $ 1000. The Internet causes people less watching TV. Limited high -resolution programming is available, although more and more channels support high resolution. Obtaining programming often requires a dedicated subscription, although some programming can be accepted by the VHF/UHF antenna.

Digital TV uses the MPEG-2OMPRESSION Standard image, also used by DVD, to minimize video data size. In 2006 will be required to make allHuns new TVs supported digital signals, but not necessarily high -resolution signals.