What Is Direct HDTV: 720p Vs. 1080i Format
Before long, all channels will be fully HD; it’s vastly improved crystal clear and makes viewing so much more enjoyable. Because it offers more pixels, it means the picture is much clearer.
For the highest resolution of clarity in television viewing, high-def offers double the pixels of regular analog TV. The nation’s leading satellite broadcast company, DirecTV, for instance, offers 130 HD channels.
Pixel ratios for standard definition television receiver is 480 scanning lines (704 x 480) stacked top to bottom. The resolution of a fixed-pixel display is defined by the total number of horizontal pixels across each scanning line. Here we have 704 pixels for each scanning line.
In order to take full advantage of HDTV’s ability for clarity and detail you need more pixels. LCD, plasma, or DLP devices need to have the capability to display those extra pixels. Progressive format 1080i is fast becoming the common format in broadcasting.
1080i is the shorthand name of a format. 1080p resolution–which equates to 1,920×1,080 pixels. The letter i stands for interlaced. The “i” is opposed by another nomenclature “p”. The alternate format of high-definition video mode, known as 720p, the p would stand for progressive scan.
HD resolution of either 1,280 x 720 pixels (720 lines progressively scanned with a widescreen 16:9 aspect ratio). The common alternative is “1080i” (1920 x 1080), which represents a 16:9 widescreen image with 1920 pixels across.
With 1080i, you do see all 1080 lines at once due to residual light imprinting on your eye. It is much sharper when the image is still. With 720p the motion is smoother and better for viewing faster action situations like animals on the run or sports.
The nice part of HD is that you can capture the video for later viewing. Direct TV satellite offers a free HD video recorder with their high-def package. It lets you record your favorite programs when you’re not at home for later replay. The HD DVR has 200 hrs of standard definition and for high definition you get 50 hrs of recordings. Plus you get to listen to amazing theater-like sound with Dolby Digital 5.1 technology.
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