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ROBERT NEMITZ
WHAT IS DIGITAL TELEVISION?
One day we all will turn on our televisions and not be able to watch T.V. How did this happen one might think? Let me introduce the wonderful world of digital television. Looking further into digital television there are three main components. The first main component is the history of digital television. Next we will take a look at the forms of digital television, and finally we will take look at analog television versus digital television. Digital television isnt as scary as it looks and one might be already using it today.
Looking into the history of digital television, its quite apparent that digital television is a relatively new technology. In 1993, a new group was formed, initially called the European Launching Group and later the DVB (Digital Video Broadcasting) project (Baker 2005). It was set up with the intention of creating technical standards. A separate organization, the Working Group on Digital Television began studying the feasibility of terrestrial digital television in Europe. Meanwhile in America, similar research was being conducted towards a fully digital system. Work by various companies in the early 1990's resulted in their collaboration and in 1993 they formed the Grand Alliance, setting down a single American standard from the work of each individual company. These standards are known today as the current format for digital television. In 1996 a Digital Television broadcasting system was adopted by the FCC in support of this efficient technology.
There are three main forms of digital television in the United States today. The First form of digital television is DVB. According to SCM Microsystems, DVB is the current format used by satellite providers today (www.scmmicro.com). DVB (Digital Video Broadcasting) takes an analog format and changes the signal into digital 1s and 0s. This format is currently based on mpeg 2 and mpeg 4 compression schemes. With the use of this format and compression schemes, the digital signals are beamed to the satellite and bounced back to the users of the pay TV provider. Europe uses similar standards for a land base network as well as satellite. These sets of standards are called DVB-T. (Digital Video Broadcasting Terrestrial)
The next format commonly used by cable companies in the United States is QAM 256. QAM (Quadrature Amplitude Modulation) is a modulation technique which uses amplitude as well as phase for encoding data for higher data rates. The phase encoding changes the signal from analog format (or digital) and changes it to a digital format that the cable companies cable box can read and decode the signal. To consumers this type of service is known as digital cable.
The final form of digital television in the United States is DTV (Digital Television) DTV includes all elements of digital broadcasting, including High and Standard Definition television, data casting and multicasting ( HYPERLINK "http://www.dtv.gov" www.dtv.gov). In contrast, DTV works on the same principle as a computer or a digitally recorded compact disk. It uses binary code, a series of ones and zeros, rather than a continuous electronic signal. Digital television is replacing the old analogue format. Analogue television broadcasting consists of taking a picture and changing its format into waves. That wave is then broadcasted accost that broadcasters territory. The analogue technology was very inefficient. Digital television broadcasting takes the same television picture and changes the information into 0s and 1s instead of waves. The 0s and 1s are then broadcasted in the same fashion as an analogue television would, and then its decoded by a digital receiver or digital television. Digital television is very efficient. The delivery method for both analog and digital remain the same. For the space of one analogue television to be broadcasted in wavelength format, twelve analogue programs can be broadcasted over that same signal in digital format, or one High Definition program at the highest quality. HDTV is the highest quality of DTV, but it is only one of many formats. In addition to HDTV, the most common formats are Standard Definition Television. (Analogue format) HDTV and Standard Definition Television is the format of the picture, (how it looks) and DTV is the way that the picture is brought to the television. These two different standards are often confused with each other as they were developed at the same time.
The world of digital television really is not as confusing as many people think. The three main components of digital television was first, the history of digital television. The next component was the forms of digital television, and finally the difference between analogue television and digital television. With proper education one can determine the difference between the digital formats and help society in this time of transition.
Work Cited page
Digital Television (DTV) Tomorrows TV Today. FCC < HYPERLINK "http://www.dtv.gov" www.dtv.gov>
Baker, J. Digital Television history. University of Exeter (Cornwall, UK) 20th Jun. 2005
Digital TV Industry Overview SCM Microsystems
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