Not yet registered? Create a OverBlog!

Create my blog

What is HD TV?

HD television (High Definition television) is a video that has a resolution that is substantially higher than that of standard television systems. Typically, HD television has one to two million pixels in its picture per frame, around five times as many pixels as standard television. This article looks at HD television in more detail.

History

The term 'high definition' is a term that has been used throughout the history of television and is a term that is interpretative of the time that it is used in. For example, the BBC claims to be the first high definition broadcaster when they began transmitting their own high definition television in 1936. These pictures were high definition compared to the television that had been broadcast before this time. However, in modern times, this definitely is not considered to be HD. High definition, as we know it today (August 2011), was launched in the U.K in 2009 and was launched through the new DVB- T, otherwise known as freeview.

What makes a broadcast high definition?

What exactly is HD? High definition is defined by three major parameters: the frame size of the picture, the scanning system used and the pictures frame rate. The frame size in pixels is defined as number of horizontal pixels × number of vertical pixels. Often, the number of horizontal pixels is implied from context and is omitted, as in the case of 720p and 1080p. The scanning system is identified by the letter P for progressive scanning and I for for interlaced scanning. Frame rate is identified as number of video frames per second. For interlaced systems, an alternative form of specifying number of fields per second is often used. For high definition television, the number of frames per second is very high, The following formulae, which you will find examples of on all HDTV sets, can be used to identify which type of HD TV that you have. '1920×1080p25' - the 1920, is the number pixels wide and the 1080 is the pixels high. The p stands for progressive scanning and the 25 stands for the number of frames the television transmits per second.

HD Ready

What is HD Ready? The 'HD Ready' term usually refers to any display that is capable of accepting and displaying a high-definition signal at either 720p, 1080i or 1080 (using a component video or digital input). Essentially, HD Ready refers to a television that is set up to receive HD television, even if the consumer is not yet receiving it.

Same category articles Home entertainment systems

How to program a universal remote?

How to program a universal remote?

Your desk is flooded with wide variety of remotes. There is one for TV, one for cable, one for DVD player and so on. If you are not happy with the kind of clutter that is there in your desk and are interested in making your life easy, universal remote is the way to go.
How to choose a DJ deck stand

How to choose a DJ deck stand

If you are a DJ (Disk Jockey) or aspiring to be a professional DJ, one of your most coveted pieces of equipment will be your deck stand. This is what normally consists of all your displays as well as CD players and computer, to store additional songs that do not fit on your CDs. This article will examine the process of choosing one such deck.
How to buy a second-hand LCD TV online?

How to buy a second-hand LCD TV online?

Only a few years ago, LCD televisions were only available for those with very large budgets. With ever falling LCD screen prices, yesterday's top of the range models are now available for a fraction of the price through a huge range of second-hand online electrical stores. This article will help you to understand television specifications and show you where to get the cheapest HDTV.
How does a wireless lavalier microphone work?

How does a wireless lavalier microphone work?

A lavalier or lapel mike is a convenient, subtle way to be heard when addressing an audience. The wireless clip on microphone means that you do not need to hold a microphone, so people who are acting or speaking on stage move naturally without carrying something in their hands.