HDTV: a legend of the teaser ads

There are a lot of nonsense talked about hdtv and much of the noise is
manufacturers and retailers of advertising ', which is extreme, in some cases
misleading.

One of the areas of greatest confusion is resolution. The resolution is defined as the
Number of pixels - the elements that make up a digital image - the image is
usually as axb, where a quotation from the number of pixels on the screen
(Horizontal) and b is the number of pixelsup and down (vertically, also known as
the number of rows). In this article we will explain everything you need to know about
the number of pixels required for hdtv.

hdtv specification

The hdtv specification provides three different types of HDTV, which is characterized by
Number of lines of resolution and give the signal. They are:

1080p (1080 lines, progressive scan)

1080i (1080 interlaced lines)

720p (720Pixels, progressive)

Any TV not capable of displaying at least 720 lines is not HD-ready "and all
Signal with less than 720 lines is not an HDTV signal.

Interlaced or progressive?

The 'i' and 'p' in the HDTV specification, see interlaced and progressive. L '
Analog TV, we have observed for years is interlaced. This simply means that each
Frame of the video (of which there are 30 per second for NTSC and 24 per secondPAL)
is divided into two camps. Each field contains alternate lines of the signal (it has the
strange, the other) which is 1/60th of a second (1:48 for PAL) is displayed.
Why is it so fast, your brain interprets every image as a single image.
Progressive scan signals do not have fields, simply show each image in its
Parts of 1/30th (or 1/24th) of a second. The result is a superior image quality,
Particularly noticeable in fast actionPrograms such as sporting events.

So all in 720 TV lines capable of displaying HDTV ready?

No, this is one of the main areas of confusion. The other important element of
specification is that HDTV signals should be widescreen, 16:9. This is
known as the aspect ratio, where '16 'refers to the width of the image and '9' on
Height. In other words, the height of the image 9/16ths of the width.
Some manufacturers promoteTV with a maximum resolution of 1024 x 768 pixels
as HD-ready. This is wrong. Although the total number of vertical pixels
above the minimum 720 required for HDTV, an aspect ratio of 16:9 to it
1280 pixels horizontally would need photo shows a line of HDTV 720. The only
Solution or squash or if the image is cut off, neither of which is satisfactory.
So, to properly HDTV Ready, TV takes you toDisplay at least
1280 pixels horizontally and vertically by at least 720.

Remember to buy at least to consider before you, the resolution of your HDTV is
1280 x 720 pixels and leave the logo on the box.