HDTV Made Easy

By now I am sure you have been hearing the entire buzz about this HDTV stuff. You are probably wondering, what’s the big deal.

HDTV stands for High Definition Television and has ushered in a whole new way of watching TV. But what is HDTV?

HDTV is a technology and not a television. Essentially HDTV is the use of a digital signal versus an analog signal. A digital signal allows you to view a television picture that is so clear it sometimes looks like you are looking through a window.

Desperate Housewives looks better, CSI looks better, Law and Order, looks better and all sporting events look better.

There are two kinds of televisions sets, STDTV (called Normal) and HDTV (call High).

The differences between the two are the number of pixels each contains. A pixel is short for “picture element” or to make it even easier to understand a pixel is those dots you see on the TV when you look closely.
The picture on a TV set is formed by dots of light (call pixels, remember), on a SDTV there are only 540 across and down displaying the picture on your TV set. On an HDTV, there are more than 1920 across and 1080 down. All of those extra dots (or pixels) are the main reason the picture looks so much better. That better image is call resolution.

Screen Resolution

Resolution refers to the apparent quality or sharpness of a video image, signal or display.

It’s usually measured in terms of the density of lines and dots that make up the display, and often referred to as “line resolution”, which is where you get the terms 480p, 720p, or 1080p, this is short for “pixel count”.

HDTV’s can show a clearer picture than standard TV’s, especially up close. They show pictures in greater detail.

HDTV has the following resolutions:

• 480p – Good
  
• 720p – Better
  
• 1080P Best (today’s standard)

Types of HDTV’s

High Definition TV’s come in three styles:

1. LCD Flat Panel
2. Plasma
3. Rear Projection/Micro Display

     LCD (Liquid Crystal Display) Flat Panel – TV’s are slim light-weight panels that respond to electronic signals to display light and color on a screen. They are basically large flat screen computer monitors. LCD technology is based on the properties of polarized light.

Two thin, polarized panels sandwich a thin liquid-crystal gel that is divided into individual pixels.Also, image brightness can be very high and color performance can be good, especially if they are placed in rooms that are brightly lit, whether natural or artificial light. Similar to plasma TV’s, LCD TV’s tend to show the best pictures at smaller sizes, and require much less power to operate than plasma screens.

     Plasma TV’s Are similar to LCD TV’s; they use an image display device technology using hundreds-of-thousands of miniature, embedded cells. Each one of these corresponds to one pixel, (picture element) and has three sub-cells. The three sub-cells are filled with a plasma gas which will ‘glow’ red, blue or green (depending on the phosphor coating) when charged electrically.
Light from the three “RGB” sub-cells combines to form a one colored pixel on the screen. Some early plasma devices were susceptible to “burn-in”, an unwanted retention of an image that may be permanently scarred onto the screen. This can still occur in newer models but not as much.
Plasma screens are generally less expensive and do a better job of showing darker colors (especially Blacks) than LCD and rear projection TV’s. They show a much better picture in dimly lit rooms and are better at showing motion and action images such as sporting events.

Another major advantage: Plasma TVs have a virtually unlimited viewing angle, so the picture quality doesn’t decline when you watch the screen from the sides as it does with most LCD sets and rear-projection TVs.

     Projection TV’s – (also called MicroDisplays) generally give you the best for less, meaning they can be bought for less than LCD and Plasma TV’s. They are available in two basic configurations – front and rear projection with rear projection being the new standard these days.
Front projection TVs are generally in two parts – the screen and the projection device itself, which are positioned some distance apart. Many front projectors are ‘portable’ in use and nature, while fixed installed projectors are common in boardrooms and home theatre environments.

Rear projection TVs are usually a single unit, with built-in screen, connections, electronics and processing gear all in one box.

Projection TV’s are sold in basically three (3) display technologies:

1. Liquid-Crystal Display (LCD)
   

• Digital-Light Processing (DLP)
  

• Liquid Crystal on Silicon (LCoS)

* The display technology means how the television creates images on screens.

Note: With most DLP sets, some people are bothered by what is called the “rainbow effect”.

This is a flash of color some viewers see when moving their eyes across the edges of bright objects on a dark background.

If you think that the 3D is a new technology, then, you are mistaken. In fact, it already made its way in the theaters way back in the 1950s. Their presence caused a lot of excitement to the viewers basically because it was something new in their eyes.

However, an optimum viewing experience was not provided by those cardboard made glasses and the old technology being used at that time. A few decades afterwards, IMAX theaters made waves in the market scene. 3D movies have become more promising. Of course, the 3D TV has also been thought of by the very competitive television manufacturers.

What they have in mind is to let each and every consumer enjoy that theater feeling even when inside their homes.

Yes, the 3D TVs are equipped with such a high-end means of technology and can now be installed in the living rooms of the homes. Apart from the 3D movies such as Avatar, Coraline, Toy Story, Final Destination, and many others, there are now television broadcasts that are transmitted via three-dimensional technology.

In a matter of years or months, many television channels and cable providers will soon be engaged in the transmission of 3D broadcasts. In fact, the 3D television manufacturers are now dealing with some stations regarding the broadcasting of news, programs, sports, and games using the said technology.

So, what should a consumer have before he can finally enjoy that 3D experience at home?

Simply speaking, there should be an available programming provider in the area that can transmit in 3D. As of the moment, many stations are now planning out their moves to serve their patrons 3D channels and soon enough, the rest will surely follow. The HDTV packages are not yet certain if they will involve additional charges or not.

The next step is to have a 3D TV installed in the home. The market already has different brands and models of the said television and as expected, they are more expensively priced than that of the flat screen HDTV models which are also present.

Shutter glasses should likewise be purchased. They are the ones that pick up the signal from the transmitter and then synchronize with it.

For those who want to watch DVD movies in 3D, they should be ones that have been recorded using the said technology along with a 3D Blu-Ray player. The cost of which will again depend on the brand name.

When it comes to the cost of a brand new 3D TV plus the other accessories that come along with it, again, it may be reasonable or unreasonable depending on the type of consumer. Someone who has the funds and is capable of the purchase will not have any problem at all.

But those who are on a tight budget may struggle dealing with the current price. If the reason is to upgrade, then, it will be wise to wait for another year or so. It is to be expected also that other models will come out anytime and that will add up to your choices.

Okay, you just purchased your new High Definition TV.

You get it home, you plug it up and you connect your cable or satellite box to it and turn on the TV and…

Hey! The picture on my new HDTV looks the same as my old TV…Why?When you plug in your new HDTV, everything doesn’t just magically become high-definition, there is a process.

Here’s what you need to watch HDTV:

HD source. You must be signed up to receive high definition service. This is done by contacting your cable or satellite company, they will provide you with a set-top (converter) box that is capable of sending you HD service.

Unless you have already contracted with them ahead of time for HD service, your current set-top-box may not be able to receive and send HD signals. Note: this will probably cost you extra $-cash-$.

Another alternative is for you have your HDTV’s HD tuner connected to an over-the-air antenna. This antenna will let you receive FREE HD programming from many TV networks. The trick is that you have to be close to a station and have your antenna pointed towards the HD signal in most cases.

I do not pay or subscribe through my satellite company, I receive HD programming by using an over-the-air antenna, which is located in my attic. This antenna lets me receive several channels FREE, especially sporting events from the major TV networks, such as ABC, CBS, Fox, NBC and WGN.

HD connections. Your set-top-box and your TV must have component-video or High Definition Multimedia Interface (HDMI) connections and you need to have the right cables to connect you HD source and your HD TV together.

HD channels. HD channels use a different numbering system on your TV and remote control. You will need to tune or switch from standard definition TV to HD TV in order to start viewing high definition channels.

I have a Samsung 50 inch television and I have to press a button on my remote to switch form the standard definition channels to HD channels, it’s that simple.

Also, the numbering format for HD is different. For example, some customers might get to NBC by pressing 5.1, while others get there by pressing 5-1, it may vary depending on your HD TV.

View HD Connections Below is a link to view different connections for HDTV’s. http://www.sceptre.com/Support/Faq/hdtv_faq.htm

Hdtv is proud to say that digital superiority is one of their many fantastic features. Hdtv also highlights the film with amazing details. When it focuses on a certain item, that item seems to be magnified for you see it like as if it is really in front of you. Cool huh?

Hdtv also features progressive scanning and digital audio. It is completely balanced. You cannot really enjoy great viewing if the sound is not really clear can you? Well HDTV’s digital audio makes you feel like the person you are watching on your television set is beside you and the two of you are talking as if in a conversation. There are also no more ghost images.

By ghost images, this does not mean that there are a number of caspers roaming around the screen. But there is a certain blur to the things you watch on TV that makes them look like they are ghosts. These kinds of ghosts are not scary at all, but they are highly annoying.

An FCC also mandates the switch and you are given an even wider viewing area. So you do not have to cramp up in front of the television set when you are watching it with your friends just to have a good view of the movie. The screen seems to be stretched so you can watch from afar, if ever you are cooking dinner, and watch your favorite movie at the same time. Now that is multitasking!

You can also watch DVDs in a much better way and satisfaction because hdtvs have a better quality DVD playback. Now isn’t that an example of all in one?

Common television sets are based on the aspect ratio of four is to three (4:3). This ratio means that the television can be measured with an approximation of its height of three feet, and a width of four feet.

However, the aspect ratio of an HDTV is, drumroll please, a whopping sixteen is to nine (16:9). This makes the image an HDTV gives out much much wider! In fact, the screen size of an HDTV is thirty three percent wider!

The width that is increased indicates a very huge improvement since it permits you to view the tv sitcoms and movies that you like, as if you were watching them in the cinema, just minus the loud snoring guy behind you and the couple that never seem to gasp for air in their kissing spree in front of you.

With an HDTV, you will never have to experience all the things that annoy when you are watching in the theater.

Just in case you do not know, when you are watching whatever it is that you are watching on a sixteen is to 9 (16:9) screen, you are actually making use of your peripheral vision. The utility of your peripheral vision will definitely make you feel like you are part of the program that you are watching.

The directory of ABC’s Monday night football, Norm Samat, did a feed about HDTV. And she vouched for the wonder that hdtvs can bring. She said that once you look at the pictures on your HDTV, you would seem like you entered a sort of trance because you actually see more than what is really shown. Groovy!

Now in terms of football, the sixteen is to nine (16:9) aspect ratio makes a big difference. If the old four is to three (4:3) aspect ratio is used, it was often a very tricky situation to have the defense covered.

But in an HDTV, they are already in your picture, so you can actually get to see more of the play, and also more of the development of the play.

Blu-ray

The HD-DVD vs Blu-ray battle resembles that between Betamax and VHS and DVD+RW and DVD-RW.

Currently, the major Hollywood film studios are split evenly in their support for Blu-ray and HD-DVD, but most of the electronics industry is currently in the blue corner.

The key difference between these new players and recorders and current optical disc technology is that Blu-ray, as its name suggests, uses a blue-violet laser to read and write data rather than a red one.

Blue light has a shorter wavelength than red light, and according to the Blu-ray Disc Association (BDA), which is made up of, amongst others, Sony, Philips, Panasonic, and Pioneer, this means that the laser spot can be focused with greater precision.

Blu-ray discs have a maximum capacity of 25GB and dual-layer discs can hold up to 50GB – enough for four hours of HDTV. Like HD-DVD, Blue laser discs don’t require a caddy and the players and recorders will be able to play current DVD discs. Codecs supported by Blu-ray include the H.264 MPEG-4 codec which will form part of Apple’s QuickTime, and the Windows Media player based VC-1.

Kenny Hemphill is the editor and publisher of The HDTV Tuner – a guide to the kit, the technology and the programming on HDTV.

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Buying an HDTV

However, it doesn’t need to be painful. By following the five steps below, you can make buying an HDTV easy and even pleasurable – until the credit card bill arrives, of course.

1. Check the resolution
If you’ve done any research into HDTV, you’ll know that the HDTV specification covers two resolutions: 720 lines and 1080 lines. So any TV which claims to be HDTV ready must have a native resolution which has at least 720 lines (this is usually the second figure quoted. i.e. if the resolution is A x B, B is the number of lines.)

However, a vertical resolution of more than 720 doesn’t necessarily mean a TV is HDTV ready. The HDTV specification states that high definition TVs must support 16:9 widescreen signals (where the width of the picture is 16/9 its height). That means that in order to display a signal with 720 lines, a TV must have a horizontal resolution of at least 1280 pixels (720 divided by 9 and then multiplied by 16)A TV with a vertical resolution of 768 pixels, should have a horizontal resolution of 1366 pixels.

A television with a native resolution of 1024 x 768, therefore, is not technically HDTV Ready, despite what it may say on the box. An HDTV signal would have to be down-sized below the HDTV specification to be shown on-screen.

2. Check the connections
In order for a TV to comply with the HDTV specification, it must have either component (analog), DVI or HDMI (both digital) inputs. If it only has S-video, composite video, or VGA, its not HDTV ready.

The other thing you need to check is that the TV you’re interested in has the correct connections to hook up to equipment you already have. For example, I have a progressive scan DVD player with component outputs that I want to connect to my TV, I also have a cable box with DVI output. So I need a TV with both component and DVI inputs.

I could also go for one with component and HDMI and buy a DVI to HDMI adapter. Don’t forget to include audio connectors in your check if you want to hook up your TV to a home theater receiver or amplifier.

3. Check the contrast ratio
Generally speaking, the higher the contrast ratio, the better. Blacks will be blacker, whites whiter and colors in between more clearly defined. Its not a crucial difference but may swing the decision one way or another if you have two or more TVs in mind.

4. Check the viewing angle
Most of us don’t watch TV form directly in front of the box, we sit at an angle to it. LCD TVs in particular have a limited viewing angle. If you sit too far to one side, you’ll notice that colors shift and the image becomes noticeably poorer. The best way to establish this is by going to a store and checking it for yourself.

5. Be realistic about size
One of the best things about HDTV is the fact that it looks amazing on big screen TVs. To see an HDTV signal displayed on a 42in TV is a wonder indeed. However, there’s no point in spending thousands of dollars on a 42in TV if you have a small living room or if the TV is intended for a kitchen or home office.

There are lots of great HDTV’s around at smaller sizes, right down to 23in LCDs. A TV that’s too bi for the room its kept in will dominate the room and look ugly, even if it itself is gorgeous. So be realistic when deciding how big your new TV should be.

Kenny Hemphill is the editor and publisher of The HDTV Tuner. Visit him at http://www.the-hdtv-tuner.com and discover why HDTV is the most exciting thing to happen to television since the advent of color TV.

Better still, keep up to date with the latest developments in HDTV and high definition DVD by subscribing to the news feed. Click the link for details.

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So you can ignore those component outputs and inputs and plug an HDMI cable between your two favorite bits of home theater kit.

After all, HDMI, being all digital, is bound to be better than component, isn’t it?

Well, no, actually. Not necessarily. It’s true that converting a DVD signal to analog, sending it over component video and then switching it back to digital in the TV will result in a slight degradation of picture quality. And it’s true that HDMI removes this issue.

However, the degradation in the signal over component is virtually imperceptible and HDMI does introduce a few problems of its own.

Firstly, although DVD players “up-convert” video from 420p resolution to the native resolution of the HDTV (720p or 1080i), the signal still has to be “re-clocked” in the television before it is displayed.

Some experts suggest that this re-clocking introduces more artifacts than the process of digital-to-analog-to-digital conversion.

The quality of the processor in the DVD player doing the “up- converting” is important here, if it’s not up to scratch that could have a negative impact on picture quality.

Secondly, any equipment with HDMI (or DVI for that matter) connectors must support an anti-piracy measure known as HDCP (High Bandwidth Digital Content Protection).

This takes the form of a code which is embedded into the digital video signal when its sent from a content player, such as a DVD player, and must be de- coded by the HDTV or HD projector.

This puts additional pressure on the TV’s video processor with no benefit to picture quality and so could, potentially, result in a slight loss in picture quality.

Using component video connections means that no anti-piracy protection is necessary.

None of this means that you should avoid HDMI. However, it does mean that you shouldn’t take it for granted that HDMI will always be better than component. The only way to find out which is best for your equipment is to try both and see which one you prefer.

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You must be wondering why. Well, there is a pretty good reason for TV buffs to get excited about the advent of TV through HDTV.

HDTV started the rise of a television paradise because they boasted and impressed consumers with resolutions that are of superior and top quality. HDTV’s superior resolution of course, comes in pair and is complemented by equally superior digital surround sound.

Thus, movie buffs have been so happy and so hyper upon the introduction of HDTV. Now, they could play video movies and watch them in original widescreen format. Not only that, the wide-screen feature does not contain the so-called letterbox “black bars”.

Letter Box (“black bars”) that HDTVs eliminate are those spaces on wide-screen TVs that annoys people, especially the meticulous ones. It gives a perception that the screen is horizontally flattened out, sacrificing the vertical traction.

HDTV and the confused market

Unfortunately, there are already a lot of TV models and technologies that the introduction of HDTV made the array and selection of TV sets more and further complicated.

Consumers who now shop for TV sets find themselves surrounded and astounded by numerous abbreviations and a wide array of TV choices that on the downside confuse them, to a great extent.

Probably, you must have experienced being so confused about the numerous choices in TV sets nowadays. It only proves that the TV technology and industry is still growing and improving to meet the insatiable demands and tastes of the technology-thirsty consuming public.

Indeed, TV is still the most powerful media. Consistently rising sales of TV sets can attest to that.

From analog TV to HDTV

For decades, TV addicts around the world have watched TV through analog signals beamed and received by the cathode ray tube or CRT TV sets. Cathode ray tubes are the tubes that make up most of the TV screen.

Analog TV works in a simple and uncomplicated dynamics. The TV signal is beamed or transmitted using radio waves that when received by television sets are translated and converted into sound and pictures, the TV experience being communicated to the audience on the receiving end.

Conventional TVs’ analog signals reach TV sets through a cable connection, a satellite transmission or over the air. Because the technology so shifting into digital, analog covert digital signals into analog signals.

Thus, the movie played by your DVD players are converted by the analog TV into analog signals, so the picture will be compatible with the conventional TV’s screen.

However, consumers and movie addicts notice and have been complaining about how the picture and sound quality of DVD movies are lowered and altered when watched through an analog TV set.

That is when HDTVs get in. Because analog TV sets do not give out excellent viewing quality to meticulous viewers, HDTV, which spun off from digital TV and digital signal transmission technologies, attracted the market and lured TV set buyers.

Because HDTV is apparently and practically fitted and custom-made for digital broadcasts and transmission, it is the perfect equipment or TV set for viewing digitally transmitted signals, whether from the DVD player, from the digital cable operators and from digital over-the-air free television broadcasts.

HDTV perfectly renders a TV viewing experience that is optimally and sound-wise excellent. No matter how more expensive HDTV get compared to its analog TV counterparts, no wonder, people from all walks of life around the world still manage to get hold of it.

Buying HDTV sets

Buying HDTV sets is now somehow tiring and stressful. Don’t get it wrong. The weariness and stress people get from shopping for HDTVs comes from the disappointment to be not be able to bring home all the HDTV sets in the appliance shop.

HDTV is really an excellent form and new technology involving and evolving the well-loved television. The inventor of TV, John Logie Baird, must be turning upon his grave now, not with disgust, but with cheers and praises for what has become of his invention.

From TV’s invention in 1926, it now comes in the form of the modernized HDTV, which will certainly make past generations envy this generation.

The best things in life are for free. That is why, viewing the world through that little window called the television must really be an exciting experience for all viewers. Get your HDTV now!

LCD vs. plasma HDTV

Each has benefits and disadvantages and so each is more appropriate in specific circumstances.

Historically, the LCD vs. plasma HDTV choice has been fairly simple. If you wanted a flat-screen that was about 40in or bigger, you had to choose plasma, otherwise you should choose LCD.

However, as LCD technology improves, LCD HDTV’s are getting bigger and most of the major manufacturers expect the number of LCDs they produce to grow steadily over the next few years while the number of plasmas will decrease. However, if you’re looking for a flat screen TV today, plasma still has a lot to offer.

To understand the LCD vs. plasma HDTV question, we need to look at the way the two technologies work.LCD

LCD HDTV’s work by shining a light behind an LCD panel made up of a fixed number of pixels. Each pixel is either red, blue or green and is switched on or off when a voltage is applied to it. When voltage is applied to a pixel, it is switched off, meaning that light can’t shine through it.

The main advantage of LCD vs. plasma HDTV is that LCD panels don’t suffer from what’s called burn-in. This is a feature of plasma TVs where they are used to watch TV stations with logos permanently displayed on-screen or where they are used for video gaming with games that have static images such as a cockpit on flight simulators.

The image literally ‘burns-in’ the screen meaning that even when the image is not present you can still see a faint trace of it on screen. So for video gamers in particular, LCD is a better choice than plasma.

Plasma

Plasma HDTV’s have over a million chambers which house one or a combination of gasses. When a voltage is applied to one of these chambers the gas ionizes and emits ultra-violet light. This light strikes red, green or plue phosphors coated on the inside of the chamber and a pixel emits this color light.

Plasma HDTV’s tend to have better contrast than LCDs because, even when a pixel on an LCD panel is switched off it doesn’t block all the light coming through and therefore the pixel isn’t completely black.

Plasma HDTV’s also tend to have a wider viewing angle than LCDs, as on LCD HDTV’s the contrast and color of the image can change when the screen is viewed from different angles.

LCD vs. Plasma HDTV conclusion

Technology is changing rapidly, but for now (July 2004) it’s still true to say that at sizes of 40in and above, plasma offers a less-expensive and generally better solution. For screen-sizes less than 40in LCD is better. However, as LCD technology improves and prices fall, this will change.

Kenny Hemphill is the editor and publisher of The HDTV Tuner – a guide to the kit, the technology and the programming on HDTV.

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One of the areas of greatest confusion is resolution. Resolution is defined as the number of pixels – the elements which make up a digital image – in an image and is usually quoted as a x b, where a is the number of pixels across the screen (horizontal) and b is the number of pixels up and down (vertical, also referred to as the number of lines).

In this article we’ll explain everything you need to know about the number of pixels required for HDTV.

HDTV Specification
The HDTV specification provides for three different types of HDTV, denoted by the number of lines of resolution and the signal type. They are:

1080p (1080 lines, progressive scan)
1080i (1080 lines, interlaced)
720p (720 pixels, progressive)

Any TV not capable of displaying at least 720 lines is not ‘HDTV ready’ and any signal with fewer than 720 lines is not an HDTV signal.

Interlaced or Progressive?
The ‘i’ and ‘p’ in the HDTV specification refer to interlaced and progressive scan. The analog TV we’ve been watching for years is interlaced.

That simply means that each frame of video (of which there are 30 per second in NTSC and 24 per second in PAL) is split into two fields. Each field contains alternate lines of the signal (one has the odd, the other the even) and is displayed for 1/60th of a second (1/48th for PAL).

Because it happens so fast, your brain interprets each frame as a single image. Progressive scan signals have no fields, they simply display each frame in its entirety for 1/30th (or 1/24th) of a second.

This results in a higher quality image, particularly noticeable in fast-action broadcasts such as sporting events.

So every TV that can display 720 lines is HDTV ready?
No, and this is one of the key areas of confusion. The other important element of the HDTV specification is that signals must be broadcast in 16:9 widescreen. This is known as the aspect ratio, where ’16′ refers to the width of the image and ’9′ to the height. In other words, the height of the picture is 9/16ths of the width.

Some manufacturers promote TVs with a maximum resolution of 1024 x 768 pixels as HDTV ready. This is incorrect. Although the total number of vertical pixels is greater than the 720 minimum necessary for HDTV, at an aspect ratio of 16:9 it would need 1280 pixels horizontally to display a 720-line HDTV picture.

The only solution is to either squash or crop the picture, neither of which is satisfactory. So, in order to be properly HDTV capable, a TV needs to be able to display at least 1280 pixels horizontally as well as at least 720 vertically.

Remember before you buy to check that the resolution of your HDTV is at least 1280 x 720 pixels and don’t rely on the logo on the box.

Kenny Hemphill is the editor and publisher of The HDTV Tuner. Visit him at http://www.the-hdtv-tuner.com and discover why HDTV is the most exciting thing to happen to television since the advent of color TV.

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