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Why The Switch To Digital Television

By: Steven Lancey

As we speak, the United States is in the process of converting all broadcast TV stations from an analog signal to digital television signal or (DTV). Switching from analog to digital offers endless improvements and advantages. One of the primary advantages is the amount of data that can be broadcast. When using a digital signal you can broadcast far more actual data than you can using an analog signal over the same amount of bandwidth. There is also a large movement to High Definition TV; to be able to take advantage of the benefits of HDTV it is crucial that the US switches to digital transmissions.

The transmission of a signal for HDTV can require up to five times as much data as a standard television signal. In the frequency range allocated for television broadcast there is not enough open bandwidth to transmit that much data via an analog signal. To accommodate more HDTV transmissions more and more transmissions in the US will have to be digital. It is possible to greatly increase the amount of compression applied to the data within the signal with digital transmissions as compared to analog transmissions. Digital transmissions use the Mpeg 2 standard of compression; with this compression technology it is possible to compress the data as much as 55 to 1. The standard is what is known as a "lossy" standard, which does mean that there is some quality lost. However the final quality is still far superior to the NTSC standard currently used for analog television transmissions. The Mpeg 2 standard is already the standard compression used for DVD's and digital satellite stations. The final quality of a digital signal is far superior to an analog signal for several reasons. First as stated earlier the Mpeg 2 is a superior technology to the NTSC and creates a better product before it is transmitted. Secondly digital signals do not allow for any loss of quality during the transmission. Analog transmissions are transmitted as a wave signal, which allows for signal degradation during the transmission. Digital signals are a series of 1's and 0's and only require that the signal be strong enough to be received. As long as the signal is received then the data will be a perfect reproduction of the data that was originally transmitted. With an analog signal though as the signal power decreases so does the quality. The weaker the signal the lower the quality of the image that is reproduced by the television receiver at the other end of the signal. This is what causes static and "snow" when you watch anything broadcast with an analog signal. Because of the improved quality and improved flexibility in broadcast format there are many good reasons for the US to make the switch to digital. In less than six months all of the Nations television stations will be broadcasting a digital signal only. February 17, 2009 to be precise. If you are not prepared, you will be left with nothing but static on your TV.

You can receive the new signal format if you have recently purchased a new television set. All television sets manufactured in the last few years have a built-in digital tuner. If you to keep your current set operating, then you will need to purchase a set top "Digital Converter Box*" to continue to receive your local broadcast stations.

Article Source: Main Articles

*To purchase a digital converter box visit: www.hdtvultimate.com

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