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Tuesday, March 25, 2008

Read This Before You Buy A Laptop.

By Robert Michael

Looking to buy a laptop? Congratulations! So, do you want a thin-and-light notebook, a mainstream notebook, an ultra portable notebook, or a business notebook? And do you want that in a Dell, a Gateway, an IBM, a Sony, or a Toshiba, to name just a few of your options?

Confused yet? It really can be overwhelming. But buying a laptop doesn’t have to mean learning a whole new language. It just means that you have to know what your needs are and what kinds of equipment is best suited to meeting those needs. Ask yourself the following two questions:

1. How am I going to use this machine?

The demands you anticipate placing on a machine will dictate how much memory you need, processor speed, display size, and the size of your hard drive. It also matters how much wear and tear you think you’re going to put on your laptop. For example, are you going to be schlepping it from college room to coffee shop, or are you mostly going to be using it at home, as a replacement for a desktop machine? Are you going to be storing lots of digital music files or photos or other multimedia that will eat up huge amounts of hard drive space? Do you need wireless capability and lots of peripherals, like CD-RW drives or DVD drives? Are you going to be doing graphics work or watching a lot of video on your laptop, such that a powerful, rapid processor and a large and high-resolution screen are important to you?

2. How do I find the laptop that will do what I want?

Thinner is not always better; but then, less is sometimes more. In the laptop jungle, searching out the perfect machine can be a challenge. It might help to look at the different models of laptop and see what features each one has to offer.

* Ultraportables

These machines are thin, small, and light—typically not more than four pounds. What they don’t have going for them is a lot of processing power or the bells and whistles of bigger systems: they don’t have internal CD or DVD drives, they have smallish hard drives, and they have displays of 12 inches or smaller. A good choice for someone on the go a lot who doesn’t demand a lot of their system, but performance lags behind other laptop models.

* Thin-and-lights

Perfect for business travelers, these laptops have powerful internal processors, 14-inch displays, and wireless networking capability, plus a combo CD-RW/DVD drive. They have lots of memory and roomy hard drives. Trade-off: they weigh a bit more (four to six pounds) and they cost quite a bit more.

* Mainstream notebooks

Basically, these laptops are desktop computers that can do a little travel. At six to eight pounds, they come with a 14-inch or larger display and more than enough basic power, in terms of processing speed, memory, and hard drive space.

* Desktop replacements

The name says it all: these laptops think they’re desktops. They have 15-inch to 17-inch monitors, more than big enough for gaming or creating home movies. They have the fastest processors, the largest hard drives, and the most memory of any other laptop available. And they weigh at least seven pounds.

Knowing at least some of the terminology should help you carry on intelligent conversations with laptop salespeople. And remember: because technology changes so fast, you’ll never have to be stuck with a dud laptop for more than two years!

Link to huge selection laptop

About the Author: Robert Michael is a writer for Laptops Cases which is an excellent place to find Laptops links, resources and articles. For more information go to:


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Wednesday, March 12, 2008

What is HDTV?

What is HDTV?

High Definition TeleVision is what HDTV literally means. But high definition compared to what? In order to answer this question, we need to know a bit about the original analog TV system.

Analog TV
30 images per second (in Europe 25) are shown by normal analog TV sets. It does this by writing image lines horizontally, 525 lines in one image (In Europe 625) on the screen. The number of pixels on one line is about 500. This would be a definition of 500 pixels per line by 525 (or 625) lines. Compared to modern computer monitors this is really bad. Even the lowest resolutions monitors have higher resolutions (640 x 480) than an analog TV.

HDTV - High Definition TeleVision HDTV is high resolution Digital TeleVision (DTV) combined with Dolby Digital Surround Sound (AC-3). There are 18 different formats defined for Digital TV of which 6 are considered to be HDTV:

Active Lines Per Picture
Pixels Per Line
Aspect Ratio
Frame Rate

Scanning Approach


24, 30, and 60


24, 30, and 60


24, 30, and 60


24, 30, and 60



4:3, 16:9

24, 30, and 60



24, 30, and 60

The difference between Progressive and Interlaced is not difficult. It has to do with how one image is built up. With interlaced technology the odd lines are shown first and then the even lines are shown. The lines are shown in this order: 1,3,5,….521, 523, 525, 2, 4, 6,…. 522, 524, 1, 3, etc. This means that every 1/60 of a second a half image is shown. This often results in flickering, which can be tiring for the eyes.

Progressive technology manages to show a whole image every 1/60 of a second, resulting in a much smoother picture.

How Is HDTV Better?
Normal TV has a resolution of about 210.000 pixels. An HDTV screen has a resolution of upto 2.000.000 pixels, which gives up to 10 times more picture detail.

The aspect ration of normal TV is 4 x 3 (4/3 times wider than high). An HDTV screen has an aspect ration of 16 x 9, which is also known as wide screen.

Higher sound quality using Dolby Surround. The Future of HDTV
The FCC (Federal Communications Committee) has mandated that all TV stations in the USA have to be able to broadcast HDTV programs by the year 2006. The mandates of the FCC do not have an impact on just the broadcast companies, but also on cable companies and consumers.

Broadcast companies have to invest on new equipment like cameras, editing equipment, etc.

Cable companies have to convert all of their equipment, including receivers at the homes of their clients.

Consumers may have to buy new equipment, like a top-box to convert digital signals back to analog signals, or even buy a whole new TV set.

HDTV is the future, and a really big step forward. We once started with simple black and white TV, then moved to color TV, and wide screen TV. But all those systems were still based on the same signals as the original black and white TV used. When color TV was introduced it was not possible to force the complete population to throw away their black and white TV-sets and buy a color TV set. Therefore a color TV signal still needed to be understandable for a black and white TV. This prohibited the improvement of picture quality until the age of Digital TV.
The need to satisfy older TV sets no longer exists and the much higher quality HDTV is available via Satellite TV Systems.

By ContentMart Editor

Thursday, March 6, 2008

How To Select The Notebook That Meets Your Requirements?

How To Select The Notebook That Meets Your Requirements?
By: Roberto Sedycias

For the past ten years there has been a tremendous growth in the usage of notebook or laptop computers. The impact is that the notebooks are slowly replacing the traditional desktop computers from home as well as from office. There are so many varieties, technologies and brands of notebooks available in the market that it has become very difficult for a regular user to identify the best fit for his or her needs. This article will help you in getting a few tips on how to select the right notebook and make the most out of your investment.

A notebook offers several advantages. The most important being the trouble-free mobility. This is enhanced by the easily available wireless internet connections all over the world. It is very convenient to carry all your work with you anywhere you go. Advancement in technology has brought down the weight and size of the notebooks significantly, making it even more comfortable for a regular user.

What are the things that you should consider before purchasing your notebook? Start with doing an analysis of your needs. Ask questions like: For what purpose will I use this notebook? The answers could include -- for internet browsing, chatting, high-end graphic designing, gaming, business or official work, programming, application development, etc. The type of notebook you choose will depend on what you need it for.

When you do your research, make notes on the prices, technical features, configuration, guarantees, and performance that each notebook has to offer. You would need to decide whether you want a notebook from an Original Equipment Manufacturer (OEM) or from a brand. It is believed that brand notebooks offer better post-sales service, and guarantee, while OEM notebooks are cheaper and offer the same hardware quality as the brand ones.

If you need a notebook that is small and light and should be carried around easily while you are traveling, go for the ultra-portable range models. These notebooks have screens smaller than 12 inches and weigh up to 5 pounds. Some models of such notebooks include Sony Vaio PCG-U3, Fujitsu Lifebook P1510, Toshiba Libretto U100, Panasonic R4, Dell Latitude X1 and many more.

If you are a business professional looking for a thin and light notebook that offers durability, security and all important features necessary for your office, then you can select from a wide range of business notebooks. These include Apple MacBook, Dell XPS M1210, Sony VAIO FJ, and Dell Latitude and etc.

If you are addicted to gaming you would need a notebook that has the capability to present high-end graphics performance. These would include notebooks with the latest processors, increased RAM and hard disk storage space, faster CPUs, top-of-the line graphic display capability, great wireless connectivity and a host of other compatibility features. Some of the best gaming notebooks include Alienware Aurora, Dell XPS M170, and Rock Xtreme CTX PRO and etc.

If you are looking for just an economic replacement for your desktop and you do not want to spend on a high-end notebook, then you can select from a variety of models offered by Acer, Apple, Dell, Fujitsu, HP, Samsung, Sony and Toshiba. These notebooks are fashioned to be used at a fixed location and weigh up to 13 pounds, so they are not very convenient if you have to travel a lot. They generally have bigger screen sizes and lower battery life.

Apart from the notebooks mentioned above you can also pick tablet PCs, transportables, high-end personal digital assistants (PDAs), handheld computers, or smart phones. These are mobile devices that you can carry with you wherever you go, if mobility is all you are looking for.

Author Bio
Roberto Sedycias works as IT consultant for polomercantil. This article can also be accessed in portuguese language from the News Article section of page PoloMercantil

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