HDTV 46 inch
HDTV 46 inch
HDTV 46 INCH compare
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| Model Name | Sony BRAVIA V-Series KDL-46V5100 46-Inch 1080p 120Hz LCD HDTV, Black | Samsung LN46B550 46-Inch 1080p LCD HDTV with Red Touch of Color | Panasonic VIERA G10 Series TC-P46G10 46-Inch 1080p Plasma HDTV | Sharp AQUOS LC46LE700UN 46-Inch 1080p 120 Hz LED HDTV | Toshiba REGZA 46XV645U 46-Inch 1080p 120Hz LCD HDTV, Black |
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HDTV Video formats
HDTV video formats
Video formats
Highlight Advertising for the hundred channels of high definition television network DirecTV
The HDTV standard at the beginning of research in the 80s of the twentieth century, it was assumed were to offer a resolution “room” of the PAL, and 1250 lines are not all active (the activities were reduced to 575 x 2 = 1.150, which meant , 16 / 9, a horizontal resolution of 2040 pixels), but for commercial reasons the term “High Definition” has been gradually expanded over the decades to less performance standards, to include in the ‘High Definition’ standard with actual performance Children of a PAL signal received with professional equipment. So the current standards are actually realizing 2K HDTV “effective” meant 30 years ago.
Today the technology consists of four HDTV video formats, which differ in the effective resolution for the scan mode image.
* The 720p format, commonly called HD READY (televisions that support it carry the HD Ready logo, that is “ready for high definition”), has a resolution of at least 921,600 pixels (1280 ? 720) with progressive scan, or for each cycle of transmission of a frame (50 or 60 Hz depending on the countries) is transmitted at the whole picture of the image. Each update involves all 720 lines and 921,600 pixels of the screen. In the case of plasma with non-square pixels is HD READY also combined resolution of 786,423 pixels (1024×768).
* The 1080i format, has a combined resolution of 2,073,600 pixels (1920 ? 1080) with interlaced scanning, which is transmitted in each cycle a semiquadro format, alternating lines alone or odd image. So each update involves 540 rows and 1,036,800 pixels.
* The 1080p format, commonly known as Full HD, is the newest of the three, equal to the progressive scan version of the 1080i, so each update involves all 1080 and 2,073,600 lines of pixels on the screen, but is usually 24fps , the speed of moving pictures.
Are planned 1080p at 50 and 60 fps, but at present are not of practical use, only a few cameras and tape recorders can resume and record so much data.
* There is also a format HR.HDTV (Half Resolution High Definition TV) with a resolution like 960×540 or the exact middle of the definition FULL HD (1920×1080) but it is not an official standard nor a native format. The HR. Downscaling of HDTV is obtained from the material to high definition. This format is not used by any broadcaster to broadcast TV but only for the creation of video files Xvid. http://en.wikipedia.org/wiki/High-Resolution_High-Definition
Standards to 1035 scan lines, used mainly in Japan, have been abandoned.
It should be stressed that, by their very nature, LCDs and plasma displays still any video signal in progressive mode, whether it is originally interlaced, whether it is already progressive.
Comparison between various video formats
For comparison, in turns filming at 24 frames per second (on film) with the use of a shutter with two shovels, with a frequency double of 48 cycles per second, hitting the projection covers and steps between frames other. Cameras shooting electronic (or digital) instead have cycles of 25 frames per second. TV stations broadcast in traditional interlaced 25 frames per second for PAL and 30 for the NTSC system, it has a resolution lower than the previous.
The quality on both HD ready is linked not only to subjective considerations (bias toward greater stability or to a higher resolution image), the contents of the transmitted signal. The scenes with the most rapid and frequent movements may benefit from more rapid upgrade of 720p, while the static scenes can benefit from the increased wealth of detail in the 1080i format. In fact, the progressive system eliminates the shortcomings of a still image, especially during assembly.
The definition of HDTV is about 4 times that of the DVD format, and despite the best compression efficiency offered dall’MPEG-4, the space required for their storage is still relevant. As the next generation of Blu-ray (HD DVD standard was abandoned) provide a capacity of up to 50 GB and beyond, this would be just enough for 2 hours of high definition movies with the DVD encoding. On the other hand, the use of advanced codecs such as H.264 (MPEG-4 Part 10) allow the transmission quality with full bitrate low enough, to get to 8 Mbits of bandwidth available on DTT receivers. These codecs are also used by HD DVD and Blu-ray to lower the bandwidth demand can be stored up to 8 hours of video to Blu-ray to multiple layers.
From the early months of 2009 are TVs on the market can support true 1080p (Full HD Progressive Scan), even with a repetition rate of 200 Hz
HDTV
HDTV
hdtv
Television in high definition, the acronym HDTV (abbreviation of the corresponding English term High Definition Television), or even just high definition, television with video quality significantly higher than that of standard television most common in the world in the second half of the twentieth century and still very common TV standards that are in SDTV. It is in other words, a term that generally indicates a level of quality of the TV.
Unlike SDTV, where the aspect ratio is 4:3 in both the traditional format and in the 16:9 widescreen, high definition provides modern standards only in 16:9.
Technical specifications
A frame of the television system PAL (European) is composed of 2 semiquadri (Field) of 312.5 lines each. In the first fields, the odd lines are played on the second lines. The signal is then composed of 25 frames per second, equivalent to 50 semiquadri. Every horizontal line has a duration of 64 microseconds (15625 Hz), 53 of which are used as an active (thus reproducing the video signal), while the remaining 11 microseconds are used as the horizontal sync signal. The same happens in the fields, in fact, only 576 lines, are believed to be active, the remaining are the cast of vertical sync. The horizontal resolution of the frame is not applicable in terms of pixels per analog video, where each line consists of a modulated analog signal, then go back, but its resolution is a function of frequency of transmission of this signal, the bandwidth will be more extensive more information can be transmitted in each line. The PAL signal has a bandwidth of over 7 MHz, but in reality the poor quality of commercial television receivers (and the poor quality of radio reception via antenna) has done over time believing that a quality signal suitable for transmission has a bandwidth of 5 MHz, sufficient to resolve about 400 lines. This is the theoretical maximum that can be transmitted with the encoding PAL, even if the quality got really less. If the source is digital, the standard sampling instead provides 720 pixels on the horizontal axis. The evolution of computing, much faster than broadcasting, has meant that the TV standards are supported by standard PC ever more efficient up to become the standard computing the cutting edge of High Definition video standard. Today should think in terms of standard “NK” where n is the number of thousands of pixels along the horizontal axis.