These features will surely be useful for those who are always striving to keep track of everything at once and receive information from different sources. Simultaneous control of several TV channels – today it is quite feasible.
The emergence of multi-screen TVs was a logical consequence of the development of media electronics. The very principle of dividing the screen into independent sub-zone was successfully implemented by the Americans back in the 70s during live sports matches. Of course, then the TV does not support any interactive features. Adding a thumbnail image to the main image is the vehicle technical broadcaster.
On sale today, there are several varieties of multi-screen technology.
Technology PIP (picture-in-picture or picture-in-picture) is the most common and most familiar. Demonstrates 2 + images from two channels simultaneously. One, the main – full-size, second, smaller – is displayed in one of the corners of the screen.
Depending on the class of the TV, the technical realization of different functions. To work multiscreen one tuner is not enough. As a rule, PIP-prosmtora affordable TVs need to connect additional video sources. Previously it was VCRs, now – DVD, satellite receivers or decoders for cable TV. In models of expensive additional tuner preset.
The main drawback of PIP – kakrtinka one overlaps the other. This technology was designed for conventional analog TV with standard 4:3 aspect ratio, where the size of the screen is simply not allowed to allocate additional space for each individual item multiscreen. Although the “picture-in-picture” today has evolved – now usually provides the ability to change the size and position of additional “training”, there is another kind of technology – POP, designed to 16:9.
POP stands for picture-outside-picture – a picture-outside-picture. Sometimes regarded as a variety of PIP. The main image is 4:3, on the remaining free space instead of a black “frame” small independent shows an image from another channel, or even multiple images with different channels.
Another feature in this family – PAP (picture-and-picture – Picture and Picture). Used in TVs with screens 16:9. Showing two images 4:3. PAP function can be called family means to achieve a compromise. Pictures of equal, though, of course, someone in the audience will have to watch your favorite show without a sound.
Function PAT (picture-and-text – picture and text) is separate from all others. Just as PAP, divides the screen into two equal parts. One – the usual video (TV, DVD, etc.), on the other – Teletext (program, weather, news, etc..).
It should be remembered that all of the above – this is just the basic notation. Often manufacturers use their own abbreviations for similar functions listed above.
To date, the presence of one of the functions of the TV – the norm rather than the exception. In any case, a multi-screen – a very handy tool to track information from multiple channels – with DVD, conventional antenna, satellite or TV / video and personal computer to which the TV is connected instead of a monitor.