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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.

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Changes are coming in the world of television. Traditional over-the-air television broadcasts will cease on February 18, 2009 and all stations will broadcast digitally. Although the majority of consumers already have the equipment and services necessary to continue to receive their television programming, there will still be an estimated 20 million who will need to take action if they want to continue viewing programming.

The digital switch over will occur in order to free up those portions of the broadcast spectrum, which traditional analog broadcasts currently occupy, for use by wireless and broadband services. Improved communications for public and safety services and more affordable high speed internet are just two of the potential benefits of the switch.

For most consumers who utilize cable or satellite TV services no action prior to the change over should be necessary as the set-top boxes or receivers they use will allow them to receive the digital signals. However, for those households who receive their television programming exclusively through over-the-air analog broadcasts, additional equipment will be needed in most instances.

Consumers who have purchased a television set in the past year or two may already have a set with a digital tuner which will allow them to pick up the new signals. However, because not every television manufactured prior to March 1, 2007 was required to have a digital tuner having a newer television may not exempt consumers from needing to seek out additional equipment.

For those households with a television that does not currently have a digital tuner and which receive programming over-the-air, one of three options are available.

o Purchase a digital ready television

o Subscribe to a cable or satellite TV service

o Obtain a set top box to allow an existing television to receive digital television signals

Purchasing a new television of course carries a price tag. Depending upon the size and display type, a new television could run from a couple of hundred to a few thousand dollars. Subscribing to a cable or satellite TV service would provide additional programming options and would eliminate the need to purchase additional equipment but would involve adding another monthly bill onto the household budget for homes that don't currently subscribe to such services. The final option, which is probably the least expensive, is to purchase a set-top converter box; the cost of which is anticipated to be around $50 by the 2009 change over.

To assist consumers who receive over-the-air television programming without cable or satellite TV services, the US Department of Commerce will be providing a coupon program beginning in 2008. The program will reportedly provide up to two $40 vouchers per household to help offset the cost of this change for such households.

Certainly the change over to digital television should provide a needed boost for emergency services communications and wireless capabilities while improving television signal efficiency and quality for home viewers. Like most change however, it will not be completely without pain, as millions of home viewers on a budget may find they need to take action if they wish to keep their current television service.

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Some people may wonder what is the fuzz with HDTVs. Firstly, HDTVs offer picture quality otherwise unachievable with standard definition TVs. The images that captivate the eyes of those who have the opportunity to stand before one of these gadgets, even for a short period of time. It is quite easy to be fascinated by the level of detail offered by these devices, becoming addicted to brightthe colors and the softness of high definition television sets project in minutes. Its aspect ratio wide screen offers a vast panorama that mimics the widescreen format that is typical of the cinema, so do not miss any action or any party. But the wonders of HDTV HDTV does not stop there, has a capacity of 5.1 Dolby Digital Surround Sound, which enhances the experience to provide superior HDTV realistic three-dimensional sound impossible to create a simulated stereo surround sound settings regular or even. Of course, every time a Dolby Digital 5.1 Speaker Set used and configured correctly on the home theater environment.

One factor that consumers interested in the early years of HD is the extremely high price of these TVs, the story is different today. Thank you to the technological evolution, high definition televisions are much more affordable than they were in the past.What was once a luxury, something that was only in the scope of those who had to spend thousands on a TV is now within reach of millions of people. From now on HDTV sets can vary in price from several hundred thousand dollars according to the model, screen size, the proposed resolutions and display type. There are thousands of models out there, one for every budget and one for each household.

If you are a fan of cinema, a player just someone who loves HDTV is sosomething to consider.

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