It's been more than a decade since the digital TV appeared. In the 1990 the research MPEG-2 group announced the new way to compress the video-stream to have been developed. The digitally encoded signal is transmitted faster, has a higher quality and takes 'less place' than the analog system. What does it mean that signal takes 'less place'? Well, digital information is transmitted same way as the analog by means of cable of broadcasting radio waves by air. But the compression allows to 'record' on one frequency the information about four channels at once.
Digital quality means no losses of sound and picture even if you're a lucky owner of a plenty inches diagonal TV-set, it means a stable signal and handicaps for those who's houses are situated not in the best place relatively the transmission tower.
The advantages are so obvious so that everyone's loved the idea of digital TV from the very beginning. All the developed post-industrial countries have decided that it's their number one aim to make all the television digital.
The first step toward that was made by the GB in 1998. They have started an digital radio television (which means that it didn't use the means of satellite to transmit the signal). It broadcast in the European digital format ' DVB-T (Digital Video Broadcast Terrestrial). The USA followed the GB in the same year and launched the digital TV of their own. The broadcast was in American digital format ' ATSC (Advanced Television System Committee). The very next year digital TV appeared in a few other countrie a part of which has chosen the USA format and the other part the GB format (these are all European countries). Japan chose to follow it's own road and developed one more digital format ISDB (Integrated Services Digital Broadcasting) which in fact is based on the European DVB-T.
Nowadays there's still no one common for all counties format of digital TV. But all the developed countries are planning to go digital as soon as possible. For example in the technical paradise ' in Japan ' they have already had to make all their TV digital. Other countries name the very proximate years as the date when all the main national TV companies are obliged to start digital broadcasting.
After all the advantages of digital TV these governmental decisions seem to be very progressive and praiseworthy. And they really are because everyone already knows that the future is definitely digital. Yet it may cause some problems.
First of all the most complains and indignation come from the producers of analog TV techniques. This is a serious hit for the industry because in fact all these laws are signing the death penalty for the analog TV. With less or more 'sweat and blood' but one day (and that day seems to be almost today) analog TV will become a page in the past. Otherwise it'll dive a tremendous lift for the producers of digital equipment.
The TV-channels will have to seek for the financial sources in order to rearrange the whole process of producing programming and than broadcasting it.
And of course all these governmental plans of digitalization the national TV will become a cause for the fuss and some extra expenses for the viewers.
In case one still wants to watch evening news or soap operas but in the new higher digital quality he/she will have to purchase a digital TV-set or a decoder. A TV-set is of course better but this pleasure will cost you about 1000-2000 dollars. A decoder converts a digital signal receiving by cable or by antenna into an analog one suitable for your analog TV-set. The decoder's price (about 100 dollars) makes quite available for the greatest part of auditory.
In some countries the government in order to popularize the idea of digital TV even was supplying people with them for free.