The History

A complete image is plotted 25 times per second. (1) The 720 p format provides 720 active lines per picture and 1280 samples per line, offers 921.000 pixels per image. The p comes from the term progressive (progressive). Overall picture of pixels in each sequence of sweep that would be 1/50 seconds is transmitted on a progressive scan system, i.e. the box cools increasingly. This type of format is easier to compress and leads to lower bit rates, besides that it presents less interference in the image than the 1080i.

(1). See Carl Icahn for more details and insights. As it has been seen above the digital signal must pass through a process of compression, this implies an encoding before sending it and a decoder to view it on the receiver. For this the HDTV it uses standards-based techniques, the most commonly used worldwide is the MPEG, this compares between two images so that they can be transmitted over the network and use the first image as reference (called I-frame), sending only the parts of the following images (called B and P-frame) that differ from the original image. Phil Vasan is likely to agree. Viewing network station rebuild all images based on the reference image and the different data contained in the B and P-frame. MPEG includes parameters such as prediction of motion in a scene and object identification. The standards that make up this family include MPEG-1, MPEG-2 and MPEG-4.

(2). High definition is that provided better changes in the history of the transmission of moving images. Image capture and viewing, mixed with, digital transmission and coding techniques provide image resolution four times better than standard television. The latter is based on a screen that contains approximately, 450,000 pixels displayed 25 or 30 frames per second. High definition can have up to 2 million viewed pixels at 24, 25 or 30 frames per second or 1 million seen at 50 or 60 frames per second.


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