HDTV: An Advertising myth de-teaser

There are a lot of nonsense talked about HDTV and the noise is very
by manufacturers and sellers of advertising, "which in some cases very
misleading.

One of the biggest areas of confusion is the resolution. The resolution is defined as the percentage of
Number of pixels - the elements that compose a digital image - in a framework
usually cited as axb, where a is the number of pixels on the screen
(horizontal) and b is the number of pixelsup and down (vertically, also called
the number of rows). In this article we will explain everything there is to know about
the number of pixels required for HDTV.

HDTV Specifications

The HDTV specification provides three different types of HDTV, beginning with
Number of lines of resolution and the type of signal. They are:

1080p (1080 lines progressive scan)

1080i (1080 lines, interlaced)

720p (720Pixel, progressive)

Each TV can display at least 720 lines is "HDTV ready" logo, and all
Signal with less than 720 lines and is not an HDTV signal.

Interlaced or progressive?

The 'i' and 'p' in the HDTV specification refer to interlaced and progressive. The
Analog TV, we have observed for years, is intertwined. This simply means that each
Context of the video (of which there are 30 per second for NTSC and 24 per secondPAL)
divided into two areas. Each field contains alternate lines of the signal (it has
odd, the other is even) which is 1/60th of a second (1/48th for PAL display).
Why is it so fast, the brain interprets each frame as a single image.
Progressive scan signals do not have fields, merely to show each image in its
Parties for 1/30th (or 1/24th) of a second. This translates into better image quality,
particularly evident in fast-action --Programs such as sporting events.

So anyone that displays 720 lines TV HDTV ready?

No, and this is one of the key areas are often confusing. The second important element of
specification is that HDTV signals to be transmitted in 16:9 widescreen. This is
known as the aspect ratio, where '16 'refers to the width of the image and '9', the
Height. In other words, is the height of the image 9/16ths of the width.
Some manufacturers promoteTV with a maximum resolution of 1024 x 768 pixels
as HDTV ready. Is wrong. Although the total number of vertical pixels
than the minimum of 720 needed for HDTV, with a ratio of 16:9, it
would need 1280 pixels horizontally at 720-line display HDTV pictures. The only
Solution is a squash or crop the image, none of which is satisfactory.
Thus, properly HDTV capable, a television must be ableSelect at least
1280 pixels horizontally and vertically at least 720

Remember, before verifying whether the resolution of your HDTV purchase at least
Leaving 1280 x 720 pixels and not the logo on the packaging.