The difference between analogue and digital television


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What is digital TV? When we talk about digital television generally refers to digital television. Digital TV may use different platforms: cable and satellite or terrestrial. Each platform uses the transmission system. How can we receive digital signals? We need a digital receiver, either built into a TV or an autonomous set-top box connected to the age of television.

But there is no single standard for digital televisionbroadcasting. For digital terrestrial television, there are four major and incompatible transmission (modulation) standards. For example, in North America uses ATSC, DMB-T, used in China, Japan and Brazil are using 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 to compress audio and video: MPEG-2 and MPEG-4 are the most commonly used video compression standards the most.This means that you must have a digital receiver compatible with standard transmission and codecs used in your country.

However, this variety of rules is nothing new. We had similar situations with analogue television. The following parameters of the analogue television broadcasting may have different values:


Number of lines
Frame rate
Channel bandwidth
Bandwidth
Travel Audio
Video Modulation
audio modulation
Color System
This meansyou had to have a compatible TV with the standard used at home to watch television. However, almost all TV sets most recent are capable of receiving analog and show the common standards used worldwide. These rules have been defined analog many years, remained unchanged and no new standard for analog television said. This means a stable for decades.

Now that has changed. In the digital world is very easy to invent a new method or algorithm, better andefficient compared to the previous one. A typical example is the transmission standard DVB-T. Is a successor of DVB-T2, which is incompatible with the old standard DVB-T, but offers greater capacity, robustness and flexibility. MPEG-4 is also a method of compressing more recent and better quality compared to MPEG-2.

This means that digital technology and continue to develop new, better and more complex (incompatible) standards will come. A practical consequence of this rapid development is that youhave plasma TV or LCD to display the image and an additional set-top box compatible digital standards used in their country. Television is likely to last 7 years or more, while the set-top box will have a shorter life.

Thanks To - Sony STR-DH700 AV Receiver


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