720p50 indicates a resolution of 1280 × 720, progressively rendering images and 50 frames per second. The number of images per second is specified next to the tag, for example. The “heights” of image are 7, and the width is 1280 or 1920 pixels. HDTV offers two quality signals: 7 are the basic tags, which can be added to either the letter “i” or the letter “p”, which means the ways of drawing the image (i = interlaced-draws every other line p = progressive-draws the line-by-line).
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Table 1 shows the basic characteristics of the primary digital TV standards. HDTV offers smoother movement, detailed and more vibrant colors, and there is a very high-quality multichannel sound that makes viewing experience even better. Since the resolution is higher, the image is sharper, less blurry and the content is closer to reality. HDTV is a technology that offers significantly higher quality of picture and sound than the traditional display technology did (analog PAL, NTSC, SECAM, SDTV and digital). The development of digital telecommunications allows the use of high-definition television (HDTV) besides standard-definition television (SDTV).
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Interframe or temporal compression is a video compression technique that achieves a reduction in size of similar series of frames. Intraframe or spatial compression is technique in the video compression for reducing the size of individual frames. During the playing (displaying), each frame is shown as a normal image regardless of recording technique of the video format. The difference between different types of frames is only in the write mode and read mode (the interpretation). Videos are usually composed of three types of frames: I-frames ( intra- frames), P-frames ( predicted- frames) and B-frames ( bidirectional- frames). Techniques for accomplishing a reduction in the video size are mostly confined to compress individual frames of content and techniques of writing changes and differences between frames. For archival purposes that significantly reduces the required space and cost of the archive. Recording signals, using compression, reduces the required capacity of storage media, and it is directly proportional to the size of compression.
In broadcasting, transmission with lower speed requires less bandwidth and transmitter with lower power.
In digital television, parameters for digital video signal with compression and without compression are given by recommendation ITU-R BT.601. Compression is the process of reducing the number of bits that are used to encode individual picture elements. Reducing data (data compression) is possible because the image contains redundant (same) information. Video compression technology is technology which allows you to record video in such a way that they take up less memory space and allows for the video to be a little different from the original, when playing.