We are now confronted using a transition. However, what exactly does it really mean? Digital technology was present in TV and radio production twenty years back. Now it is the right time to execute it one of the final links toward viewers and listeners who depend on terrestrial reception, in transmitters. Digital television is a wide term. We must differentiate between digital creation (making of the program) and actual broadcasting – transmitting signals to our rooftop antennas. It will be possible to create TV program together with the newest digital technology and air it in analogue or to produce in the quaint way that is analog and broadcast it. Thus be cautious when you talk about digital television.

Take a look at this simple example, if you don’t know what’s the difference between digital and analog signals. You’ll be able to tell how big is your TV display in two different manners. If the size is shown by you with your hands then this is an analog value. The size of screen is represented with all the space between your left and right hand. This space can be arbitrary small as well as the value (in this case the space between hands or display size) can be any value between zero (both hands together) and the maximum span of your hands.

To tell the display size in digital you’ll quantify it with meter tape or ruler by rounding that number to some suitable variety of decimals and noticing the amount at the conclusion of screen. This amount now signifies the digital (numerical) value of the display size. Everything you’ve got done is actually an analogue to digital conversion. Now you have a number that represents the size of the screen. It’s not an exact value of the screen size but a value which is sufficient for many functions, as you’ve rounded the amount. To measure value that is precise it might require an endless variety of decimal places that is not possible to attain and generally we don’t need that precise amount.

Why are we switching to digital television broadcasting? The main reason is more powerful usage of the radiofrequency spectrum. The bandwidth of this channel is between 6 MHz (USA) and 8 MHz (Europe). The quantity of radiofrequency spectrum open to television broadcast medium is limited. So there’s a fixed quantity of stations (frequencies) that can be utilized for television broadcasting. If we are able to make certain that transmitters airing on the same frequency are far enough to avoid interference we can reuse these frequencies. Many countries have used all frequencies and additional growth of television stations with terrestrial broadcasting was impossible. A fresh technology needed to be developed. Sound and video signals are digital and may be effectively compressed with various compression approaches. Digital broadcasting can use one frequency station to broadcast a package of compressed television, data and radio services called multiplex.

Different digital standards have been created. ATSC is used in North America; DMB-T can be used in China; ISDB-T can be used in Japan while many other countries, Australia and Europe have decided to use DVB-T. All these standards carries a stream of digital data. This transport stream comprises compressed sound and video. There are two popular codecs or compression algorithms (standards) used for compression: MPEG-2 and the newer, better standard MPEG4. Every one of these standards are incompatible and you will need a digital receiver (set-top-box) which is harmonious with transmission and compression standards used in your nation.

The electronic revolution in the television industry seems to have taken years to get to the consumer. It’s been tough since it needs the co-operation of the companies that make the gear to show, receive and transmit digital pictures, the TV companies that broadcast the programs and the movie and television sector that produce television and the movies that we watch. This article will trace the evolution from analog TV that is regular to the digital TV.

Today most folks are still getting analog television. Analog television technology is approximately 60 years old but still produces good quality graphics. In North America, Japan and part of South America the normal analog signal is the National television standards committee (NTSC) and in Europe and most other areas of the world it’s either Phase Alternating Line (PAL) or Sequential colour with memory (SECAM). SECAM is especially found in French speaking areas of Africa and France. Many countries that had SECAM are gradually moving to nations that were previously in the Soviet Republic , notably nations in Eurasia and the PAL system. Although there are numerous differences between the three technologies, the most evident to the viewer is the line resolution. The NTSC system shows 525 lines on the display and PAL displays 625.

These analog systems have functioned fine for 60 odd years and an important basis for transforming, as well as the only cause for anxiety, is that the signal was frequently subject to noise that may degrade the image quality.

The procedure whereby the average household receives digital television is evolving. They cannot view digital quality graphics as the typical house still features an analog television however they could be receiving digital signals. This means the signal could be clearer but before they are able to see the graphic it needs to be converted back into the conventional analog graphic (525 or 480 viewable in NTSC). And so the means of broadcasting the image is digital but the viewing is still analog. Usually the conversion back to analog is done by means of a set top box or satellite system.

The end point of the evolutionary phase is always to have digital transmission going into television or a digital display system. It is possible to safely say that you are viewing digital television, when this occurs.

When the means of producing the transmission or broadcast of the media, media and the devices for viewing the media conform to the ATSC standard afterward the benefits of digital TV is going to be really noticeable to the average television watcher.

The 2012 London Olympics really brought home to me just just what a huge technological jump in digital media has happened during the previous few years. There has been major progress in digital compression and transmission.

With analogue television transmission nearly becoming extinct, digital televisions promise of delivering more for less has become a reality. Now, how did we arrive at this stage and what does the future hold for digital multimedia?

Before the digital switchover, analogue television was resource hungry in terms of the total amount of bandwidth needed to carry just one station. This is generally between 6 – 8 MHz based on the kind of video standard being used. This restricted the amount of channels which might be transmitted, since there’s a finite amount of spectrum that should be shared with other services such as radio cellular and two way communications.

Exactly what the digital standards of ATSC (North America) and DVB (Rest of the World) supplied was the capability to reuse the existing analogue spectrum better. This meant a typical 8 MHz carrier useful for analogue broadcast may be converted to dvb t (Digital Video – Terrestrial) making it possible to carry 9 standard definition channels or 3 HD channels plus one SD station for the same amount of bandwidth.

It would have required to achieve this with the old analogue standard. Digital television doesn’t suffer from ghosting or other artifacts which troubled analogue systems and is quite a bit clearer along with squeezing more channels into less space. Being digital additionally allows other features like electronic program guide, enhanced digital sound and subtitle support to be comprised.

Televisions can be purchased together with the electronic decoder integrated and a separate set top box can be used by older televisions. As technology advances, we shall also find improvements in the compression techniques used, which means more content for digital media it has enabled 3D broadcasts for some events including the Olympics.