What is digital TV? When it comes to digital television, digital television, we usually mean. The technology of digital television platforms: cable, satellite or terrestrial. Each platform uses different transmission systems. How can receive digital signals? We need a digital receiver, or TV or stand-alone set-top box that integrates with your old TV.
But there is a single standard for digital televisionBroadcasting. For digital terrestrial television, there are four major and incompatible transmission (modulation) standards. For example, North America uses ATSC, DMB-T uses China, Japan and Brazil ISDB-T and in Europe, Russia, India, Australia and many other countries use DVB-T. In addition, there are many codecs (algorithms) that can be used for audio and video compression: MPEG-2 and MPEG-4 are the most widely used compression standard for video. This means that you needDigital receiver uses compatible with the transmission standards and codecs in your country.
But this diversity of standards is not new. We had similar situations in analog TV. The following parameters of analog television transmission can take different values:
Number of lines Frame rate Channel bandwidth, Video Bandwidth Audio Offset Video modulation Audio modulation Color System This means that he used a TV compatible with the standardBe the capacity of their country to watch TV. However, almost all analog TV receive and display current set of common standards in use worldwide. These analog standards were set many years ago, have not been changed and added no new standard for analog television. This meant a stable situation for decades.
Now this has changed. In the digital world, it is so easy, a new method or algorithm, better and more efficient than the old invent. A typical example is theTransmission standard DVB-T. DVB-T2 has a successor, who is not with the old standard DVB-T, but provides greater capacity, toughness and flexibility. MPEG-4 compression method is also a newer and better than MPEG-2.
This means that digital technology and to develop new, better and more complex (incompatible) standards will be. A practical consequence of this rapid development is that a plasma or LCD and a separateDigital Set-top boxes compatible with the standards used in your country. The TV will probably be the last 7 years or more, while the set-top boxes will have a much shorter lifespan.
