Posts Tagged ‘Guide’
Home Theater System Buying Guide
In order to get a true cinematic experience while watching your favorite movies at home, not only will you need great video, you’ll also need great audio. When deciding on whether or not to get a home theater system, remember that audio is half the movie experience. Having a great sound system while watching a movie will wrap you up in the movie and will allow you to feel as if you are there.
Unfortunately, getting the right home theater system can be a bit confusing at times, especially when you try to build the perfect sound system yourself. Our product specialists usually recommend all-in-one home theater systems to our customers, which take all the confusion out of the equation. When you buy an all-in-one home theater system, all of your speakers will be “voice matched” so one will not offset the other and instead they work together giving you a better overall audio experience.
Below you will find a few things that our product specialists recommend our customers to consider before making a purchasing decision when buying home theater systems.
Power: Depending on the size of the room, and the amount of power you want, you should consider the output of the speakers and the subwoofer to determine the total output (this is usually available in the product specifications). Generally the higher the amount of watts, the more power the system will give you.
DVD Player: If the home theater system is coming with a DVD player, see the DVD Player Buying Guide to see if it fits your needs.
Channels: It is important that you decide upon how many speakers you want in your home theater system. The standard for most surround sound systems is 5.1. The five in 5.1 represents five satellite speakers, and the .1 represents the subwoofer. In addition to the standard 5.1 home theater systems, there is 2.1, 6.1, and even 7.1.
Amplifiers: If you want your movies to sound even better, consider a home theater system with a built-in or integrated amplifier. This will make the sound even more clear and crisp than an ordinary home theater system would.
Size: Consider the size of the home theater system when you are purchasing. Make sure that the speakers fit in the areas that you desire. Most home theater systems have wall-mountable speakers, which can save a lot of table space by allowing you to put the speakers up on a wall instead of having to set it on a table.
Design: Another thing that may be of importance to you, but not necessarily for the quality of the home theater system is the design. If you have a great system but can’t stand the appearance of it in your living room, than you probably won’t be too happy with it. Though the design of a home theater system is one of the most basic things to look for, many can overlook it because they are often overwhelmed with the product’s specifications. Don’t let this happen to you.
Definitions:
Watts: A measure of power consumed or dissipated by an electrical component.
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A Beginners Guide to Digital Camcorders
Digital camcorders record information in electronic, or digital, form, to a range of digital storage media, including tape, DVD and hard disk.
Key Features
Popular recording formats for digital video, nowadays, include Mini DV tape, Mini DVD and hard disk drive (HDD) storage, akin to that used in computing technology. Mini DV tape is becoming scarcer, but, nevertheless, still provides arguably the highest video quality, and easiest editing. Mini DVD camcorders record to special DVD disks, 8cm in diameter, which are compatible with many, but not all, domestic DVD players. Mini DVD files are more difficult to edit than those recorded to Mini DV. Hard disk drive digital camcorders may allow up to 7 hours, or more, of highest quality video to be recorded, and files can be manipulated, and deleted, in the same way as they are on a computer.
The performance of a camcorder in low levels of light is often what sets a good model apart from a lesser model. This performance is determined by the size, and other characteristics, of an image sensor, known as a CCD (“Charge Coupled Device”), or CMOS (“Complementary Metal Oxide Semiconductor”). The larger the image sensor, the more light that can be admitted, and the brighter and more colourful the resulting image(s). Consumer camcorders normally contain a CCD between 1/6 and 1/3 of an inch in size. The Mustek 8200 model, for example, offers a 3.0 mega pixel CMOS sensor, and a maximum resolution of 8.0 mega pixels.
When it come to actually shooting video footage, a large, integrated LCD (“Liquid Crystal Display”) screen can make it easier to see what you are recording, particularly in situation where using the viewfinder if difficult, or impracticable. An LCD screen can also be used to play back video footage, once it has been recorded. Most LCD screens are around 2.5 inches, measured diagonally, although screens as large as 3.5 inches are available. A larger screen inevitably means a larger camcorder, and probably a higher price tag, too. The Mustek DV535A model, for example, features a 2.4 inch TFT LCD screen.
The size and weight of a digital camcorder determine how easy it is to carry around – and, therefore, possibly, how often you take it with you, and use it – and how easy it is to physically operate. The emphasis on smaller and smaller camcorders means that price may, in fact, be inversely proportionate to size, despite tiny camcorders having fewer features and less accessible controls.
Conclusion
Specifications can be useful in helping to narrow down your choice of digital camcorder to a manageable number, based on your available budget, but there really is no substitute for physically getting your hands on your chosen camcorder. This allows you, for example, to feel the weight of the camcorder, and to check that its controls are large enough for your fingers. Bear in mind, too, that unless you intend to use a tripod, some form of image stabilisation – digital, or better still, optical – will probably be required.
Alicia Taylor is a researcher and writer on electronics, financial and business topics.
e-tailers such as 3 Wisemonkeys now offer a guide to buying digital cameras & camcorders. As well as producing quick guides such as the one above, 3 Wise Monkeys will respond to individual queries and offers detailed buying advice over the phone with no pressure to purchase.
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Wi-Fi Information Guide
Wireless: To Be, Or Not To Be? That Is The Question Facing Schools Across The Country.
There has been a lot of hype in the media about concerns wireless Internet connections (Wi-Fi) are harming children. But is there a basis to these concerns, or are these fears unwarranted?
Probably the most concerning information to come out of these stories is that these wireless connections emit radiation with a similar frequency to microwaves and mobile phones. And that fact has got people worried that it might cause cancer, brain damage and heart disease, not to mention headaches, fatigue, nausea, dizziness and memory problems in the short term.
A BBC Panorama investigation caused panic when they claimed that the radio frequency radiation levels of some classes that have Wi-Fi connections are up to three times more intense than the levels found in the main beam of intensity of mobile phone masts. However, The Guardian then quoted various scientists who refuted this claim, and essentially discredited the investigation.
BBC News reported that while the heating effects of high exposure to electromagnetic radiation could be damaging, mobile phones and microwave ovens have a much higher power level than wireless connections. The report then pointed out that there is no evidence that suggests electromagnetic radiation at radio frequencies has any impact on health when the energy levels are at such low levels. In other words, there is no proof that Wi-Fi connections are bad for our health.
In fact, The Times stated that a wireless-connected classroom in Norwich was tested, and the levels of radiation were found to be 600 times lower than the levels considered dangerous by the Government. The classroom was tested using the International Commission’s NonIonizing Radiation Protection processes, which determines how strong radiation is based on how much heat is produced. Do the negative arguments stand-up?
Despite the articles above, Sir William Stewart, the chairman of the Health Protection Agency who pointed out in 2000 that mobiles phones could be detrimental to people’s health, has been quoted in a number of newspapers warning of the potential dangers of Wi-Fi technology. He has issued a plea that students who come in regular contact with Wi-Fi technology should be monitored for any ill effects.
Labour MP Ian Gibson, who was interviewed by Sir William Stewart for an upcoming programme, backed the statements made by Sir William Stewart, and called for an official inquiry into Wi-Fi connections. Gibson is MP for Norwich, a city that has recently been set up as a wireless city.
These sentiments have been echoed by Mike Bell, chairman of the Electromagnetic Radiation Research Trust; Alasdair Philips, director of Powerwatch, an information service; and the Professional Association of Teachers, whom are currently pressuring Education Secretary Alan Johnson to call for one such inquiry.
Dr Olle Johansson of Karolinska Institute in Sweden has been studying radiation similar to that being given off by wireless connections and found there are biological implications. However, when he was asked if it was right to limit Wi-Fi usage based on thermal effect, he refuted the idea.
The Government believe the technology is perfectly safe, taking the advice from the World Health Organisation, and have not yet set up any official inquiry. Are our children safe?
One of the greatest concerns is that of our children. Children are more vulnerable to radiation because their skulls are thinner and their nervous systems are still developing and because they will be exposed to more of this radiation during their lives.
Although there is no evidence yet supporting the notion that wireless connections emit harmful radiation, the thought that children may be exposed to dangerous radiation, especially considering how many schools use the technology, has some parents up in arms.
The Independent newspaper reported that according to some estimates, more than half England’s primary schools, and about four-fifths of their secondary schools, have Wi-Fi technology installed.
In several European countries, provincial governments have banned or limited the use of wireless technology in their schools. And back home in Britain, Stowe school has removed part of their Wi-Fi technology after a teacher began having headaches and nausea as soon as it was installed.
However there is a chance this teacher was just “electrosensitive”, a condition that affects three out of one hundred people according to the World Health Organisation.
In addition to this theory, James Rubin from the Institute of Psychiatry has stated that people can develop headaches if they believe such technology gives people headaches, even if the signal is not present. What are the advantages and disadvantages of Wi-Fi Internet Connections? Advantages of Wi-Fi
The main advantage of Wi-Fi is users can connect to the Internet without being plugged in. As long as the computers are within range of a host network, users can log on to this network from anywhere.
What this means is that students can be outside, or in areas where cables cannot run, and still be able to use the Internet.
In addition, in some circumstances Wi-Fi can be cheaper to set-up and expand than a cabled network, especially as many Laptop or Notebook computers now come with inbuilt wireless technology. Disadvantages of Wi-Fi
Wi-Fi connections can be unreliable, especially when working at a distance from a base station as the signal strength drops. Technology with similar frequencies, like mobiles and microwaves, can disrupt the connection, which means students may be disconnected from the Internet, or at least the speed of the Internet will be greatly minimised.
Browsing and downloading speeds can also be much slower than a cabled connection simply because the speed of the Wi-Fi device is slower.
Wi-Fi networks in schools are made to be easy for students to connect to, but by making them easy for the school children to log on, they also make it easy for Internet hackers. These hackers can put viruses onto the schools network and the computers logged onto the network, and they can also steal information from student’s and school computers logged onto the Wi-Fi server.
Finally, battery life is minimised because of the extra power needed to connect to the network and Internet without cables. Final Verdict
BBC News reminded the public of Karl Popper, one of the great philosophers of science, who said science is about falsification. You can prove theories and hypothesis are incorrect, but you can never prove they are correct. So, theories are innocent until proven guilty. And with no hard evidence to suggest wireless technology does negatively affect our health and the health of our children, the technology can only be considered safe.
Further to this, BBC News pointed out that the television and radio modulated frequencies that come into our homes are just as powerful as Wi-Fi technology. If the journalists were so worried about the negative effects of Wi-Fi, should they also be worried about the effects of their own medium.
However, the “fact” is that when it comes to children many parents and school staff will be concerned about the potential effects of the “electronic smog” created by Wi-Fi and will choose to play it safe by minimising, or even eliminating, the use of Wi-Fi within schools until more hard evidence is available.
And while there are many other advantages for using cable technology over wireless (see the ‘What are the advantages and disadvantages of Wi-Fi Internet Connections?’ section), perhaps schools should be using cabling over wireless technology even if it is in theory perfectly safe.
This article was written by Steve Collis for PC Support Services company Ashby Computers.
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A Guide to Digital Camera Ratings
Many of us use digital cameras to take our pictures for a variety of functions and events. We need a good digital camera to take these fantastic pictures. To help us with choosing a good digital camera we can use digital camera ratings. These ratings will enable us to select the camera that will be suited for our photographic abilities.
To see if we have found a reliable way to choose a digital camera we can look at digital camera buyer’s guides, or photography magazines to select the criteria that will help us. These various digital camera ratings will let us see how the different digital cameras perform in value for money, the handling of the camera, the performance of the camera and the various features that can be found.
When we look at the digital camera ratings for cameras like Minolta, Nikon and Pentax we need to see the performance of these types of digital cameras in different digital camera ratings. The ratings will briefly cover the aspects of how good the optics in the digital camera of your choice is.
The rating should state if you have a digital camera that will provide you with pictures that are clear and sharp. You will also need to know if you are selecting a digital camera that is good for an absolute beginner to digital photography, a semi-serious photographer, an individual who is taking pictures for as a hobby.
Additionally the different digital cameras must be useable by the professional photographer. With the digital camera ratings you can also investigate how the camera’s handling is. You will need to what your selected digital cameras, like the Canon Rebel Digital XT, feels like as you take pictures in different situations.
This means that you should see if there is any way to hold the camera comfortably. The digital camera ratings will inform you about the control layout. You should be able to read and understand what is on the control layout. With a digital camera rating you can also see what types of features are found on the digital camera.
These various features will let you see if there is a menu system that will let you navigate through the different items that you have on your selection of digital cameras. When you look through the different digital camera ratings you should note how the exposure and the metering modes are for the various digital cameras.
With this newfound knowledge of the digital camera ratings tucked under your belt, it will become easy enough for you to choose a new digital camera.
Muna wa Wanjiru is a web administrator and has been researching and reporting on internet marketing for years. For more information on digital camera ratings, visit his site at DIGITAL CAMERA RATINGS
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Buying a Digital Camera? Read This Buying Guide!
Many digital cameras with upgraded technology are being introduced every day. This makes it more difficult to select a camera, as you are left with a wide range of models to choose from. However, most buyers have specific features and needs in mind. Rather than going for the latest model, buy digital cameras that best suit your requirements.
What should I look for when buying a digital camera?
The cheap camera lenses, resolution, display size, performance and battery life should all play a significant role in your buying decision. Here are some features to keep in mind while picking the right camera for yourself.
Resolution:
Resolution is typically defined as the number of pixels that make up a picture. A digital cameras resolution is closely related to image quality. You need a high resolution camera to shoot and print highly detailed photographs. If you want to enlarge and crop any of your photos without loss of clarity, go for cameras that offer a higher resolution. If you do not intend on printing your photographs and would rather email them to friends, a lower resolution camera would be a better choice. They are more affordable and still produce fairly good images.
Memory and Connectivity:
Generally, digital cameras have a removable storage option, such as a memory card slot. Digital cameras support a wide range of formats like flash memory, memory sticks, SecureDigital cards, SmartMedia cards and xD Picture cards. Many TVs, laptops, digital photo frames and some gaming consoles have memory card readers, so you can easily view photos that are stored on memory cards. If you want to save money, store photos on the cameras internal memory rather than on a memory card and transfer them to a PC or Mac using a USB cable. Digital memory is a huge time and money saver!
Batteries:
Rechargeable batteries are highly recommended because they can be charged and reused again. Recent cameras are compatible with NiCad, NiMH and lithium-ion batteries. Though NiCad and NiMH are inexpensive, lithium-ion is worth the extra money. They are long-lasting batteries with low self-discharge rates. You should opt for cameras that are compatible with lithium-ion batteries. A few cameras come with an AC power adapter that can be used to charge the digital camera battery as well.
Zoom:
Digital cameras come with two types of zoom lenses, optical and digital. Both of these zoom lenses allow you to take close-ups of a distant subject, although they accomplish this task through different means. The optical zoom magnifies the image before the shot is taken, whereas the digital zoom artificially magnifies the image by enlarging the pixel area but this leads to a loss of resolution. You should pay more attention to the optical zoom rather than the digital zoom when comparing models.
Modes:
Most cameras available today have preset modes for shooting images under different conditions. Factors such as exposure, aperture, focussing, light metering, white balance and sensitivity can all be adjusted. Many digital cameras also include video capture modes, enabling you to take short videos at different frame rate speeds.
ViewFinders and LCD Displays:
The optical viewfinder is the window you look through when taking a picutre. Although there are digital cameras with viewfinders, several of the latest models have only an LCD display. The LCD screen lets you view an image as you take it and also plays back pictures and videos saved on your camera. Anti-glare screens are best for buyers who plan on shooting a lot of photos outdoors. If you need a durable camera for rough use, opt for a scratch resistant screen.
Technology:
Digital cameras also come with innovative technologies that make photography fun and easy. Do u want to avoid overexposed or darkened faces, recognise multiple faces or optimize the color and tonal qualities of your photos? Not a problem. Todays cameras are well equipped with automatic red-eye and camera shake detection and correction as well as multiple face recognition. Not no meantion tons of
What are the different types of cameras and camera accessories online or available through conventional stores?
Point-and-Shoot Models:
Point-and-shoot cameras are a dime a dozen. These entry level models provide low resolution with little magnification. If you do not want to spend time on focusing and figuring out the settings and controls, a point-and-shoot camera is just the ticket. You will find plenty of these models that are low in cost and easy to use.
Intermediate Models:
These models are especially designed for beginners. Equipped with a range of automatic settings, these consumer-level digital cameras produce flawless pictures. They usually have a resolution of 3.2 to 5 megapixels and a 3:1 to 4:1 zoom lens.
Advanced Consumer Models:
If you have taken a class or photography is one of your hobbies, then you will probably want some additional features. Choose from the many advanced consumer models with higher resolutions, quality lenses and morer zoom. These models let you add features based on your needs and give you the freedom to personalize the settings.
Prosumer Models:
When you buy digital cameras, if consumer models are too basic for you and professional models are too complex, you will love a prosumer model. These sophisticated cameras have the best of both worlds. They have a vast number of options to work with, like switching between automatic and manual focus, selecting the shutter speed and adjusting the aperture settings. You will also have the opportunity to express your creative side by manipulating images. You can adjust the brightness and contrast levels for truly unique snaps. You can expect a minimum of 5 to 6 megapixels in this category. These digital cameras can take 2 to 3 pictures per second, but tend to be more fragile than other models.
Professional Models:
You will need a top of the line model that sports the latest features to meet your high demands, if you are a professional photographer. Professional models are capable of producing high resolution images with magnificent colors and clarity. They have interchangeable lenses and a resolution of up to 14 megapixels. These models are the fastest on the market, allowing you to take 5 pictures per second. Professional digital cameras have a whopping storage option of at least a 1 GB mini hard disk drive, on an average.
Bob Shanty has been researching and writing articles that help shoppers make more
educated buying decisions on buy digital cameras for online shopping
mega store BIGshop for years. For more articles by Bob please visit http://www.bigshop.com.au.
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Buy a Cell Phone – Complete Guide to Mobile Wireless Devices and Plans
Nothing in the history of human technology has gained as much popularity or necessity as the cell phone other than maybe the personal computer. They allow you to be in contact all of the time anywhere in the world (providing you have reception). You can do more than just talk these days. These phones let you surf the web, play games, text, and even send and read email. Digging through the many service plans and accessories can be a very difficult task for even most veteran users. Read on to learn how to get the perfect service plan and phone for your wireless needs.
Choosing to buy a cell phone and a service plan to match is going to take some research and some work, so do not expect to find your perfect match overnight. Cell phones are no longer just a convenient way to keep in touch audibly, they are a lot more since their first appearance in high tech culture. These days you may find yourself checking your e-mails, sending pictures and text messages, keeping track of your stocks or world news, editing and reading business documents, listening to your favorite MP3 songs, or adding new personal and business contacts via your laptop computer.
When shopping for a phone, your choice of wireless service can alter which type and model you will be using. A wise plan of action is to shop for your carrier first. Finding out the best coverage and monthly pricing plans for your area will make your experience with your phone more enjoyable. Remember, even the best phone will be worth squat to you if you do not have a good carrier. While some accessories will work with many models, most phones will work only with one mobile carrier due to the exclusivity of their networks. Most providers lock their phones so you are less likely to leave their wireless network so remember that the wireless network is your phone’s life support.
Smartphones
What is a smartphone? Basically it is a cell phone but with the added capability of running document type applications and comes with a alphabet keyboard style pad, usually it is the Qwerty. Aside from that, the smartphone has more memory and a larger screen for browsing the Internet and sending emails. As far as media goes, a smartphone is also a perfect way to watch movies, video, and listen to MP3s. Most smartphones are now also 3G phones.
3G Phones
3G cellular phones are basically third generation mobile technology phones that allow you to transmit data (Internet) in larger amounts at a much faster rate, 2 megabits to be exact. This is far faster than the original speeds previously available (19 kilobits per second). So if you have documents you need to send to your boss or associates, a large amount of email messages to send, need to surf the web for research, or need to send video or images often then this is the generation of phone you will be wanting to acquire.
While a 3G phone is a great technological advancement, a third generation phone is only going to be as good as the network it is on. As a matter of fact, some areas may not carry 3G services at all, so make sure to ask your dealer if your area can even take advantage of the data speeds.
Sprint, AT&T, T-Mobile, and Verizon all claim to carry the same data rates for their select 3G phones. The keyword spoken is “select”. Make sure you understand which phones will actually be compatible with the 3G networks and what speeds your actual phone can handle as well. You will want to ask if your phone is compatible with either the EvDO or HSDPA networks, if not, then you may want to seek out another phone that is.
GSM Phones
While there is a wireless standard for the United States, many countries will use additional wireless standards that can cause many problems for any US citizen traveling abroad with their US bought phone. GSM stands for the Global System for Mobile communications. If you plan to travel outside of the United States then you will want to entertain the possibility of owning a Quadband phone. Quadband means your phone runs off of four world frequencies being USA (850 Mhz and 1900 Mhz), Europe, and Asia.
If you plan to travel to rural areas within your own backyard (United States) then look into purchasing a tri-mode phone which can run off of an analog channel and two digital frequencies for additional coverage in in those low coverage areas.
Phone Body Styles
It is becoming where no one person has the same style of phone these days. They have different names such as the candy bar (phones that slide open from either the side, top, or bottom), the swivel (phones that twist to expose the phone functions), and the ever so common clamshell (flip phone). A quick tip to remember when choosing your phone style is that if your phone comes equipped with the keypad exposed on the outside, make sure it has a key lock. You do not want to be calling everyone under the sun while walking with your phone in your pocket.
Style vs. Function
Regardless of the newest trend or fad, make sure the style you choose is one that works for you. Testing the comfort of the phone against your ear is not commonly practiced, but you will find quickly you will have wished you had tested it once your ear gets sore and raw from your various hour long conversations. Also practice answering the phone to see how easy it is for you to operate and see the caller ID, having an easily accessible phone can help reduce unnecessary last minute stress when finding your phone in the first place. Although smartphones will add some bulkiness for talking, their keyboards are necessary for ease of many functions such as typing and web browsing. You may have to sacrifice some talking comfort. If you can find a medium between function and comfort, you may have found your match.
Batteries
Newer phones can give you a lot of talk time compared to the cellular devices of the past. These days a phone can give you up to 4 hours of talk time and up to 14 days if used with a standby function. Remember, not all phones will have this lasting power but more and more are getting this power efficiency added to their battery life. It is important to remember though, that the higher the bandwidth your phone uses, the more battery life can be drained from your phone. Also remember that the more functions you use on your phone, the more battery life you can expect to use as well. Some phones have additional options such as larger capacity batteries for an additional charge, this may be an option you will need.
Phone Screens
Now if you plan to use your phone almost exclusively for phone calls then your screen shouldn’t be too much an issue. As long as you can see outgoing and incoming calls, you should be okay. If you plan on utilizing a 3G or higher device a larger screen will be necessary to properly view the web, emails, etc. Make sure you are able to tweak with the back light settings of your phone before you buy it to check it’s visibility under different lighting situations.
Touch Screens
While the concept of the touchscreen phone is relatively the same, not all touchscreens function the same. Some screens can register more than one touch activation at one time. This kind of screen is called a multi-touch. A multi-touch screen will let you manipulate an object while it is being touched such as swivel, twist, zoom, drag, etc. Single touch screens register one touch at a time with your finger and while it may seem less zesty, it can also help save you from accidentally doing more than you intended to. A good touchscreen phone should allow you to adjust sensitivity settings that work better with your own personal style, or should we say, personal touch.
Keypads
If you are purchasing a smartphone then you will be running into what is called a Qwerty keyboard. These keyboards have the alphabet on them as well as punctuations to help type out emails and texts more efficiently. Qwerty usually comes as an addition to the dialing pad. Aside from smartphone keypads, make sure your numeric dialing pad is just as easy to use. Smaller buttons can tend to get in the way of each other causing miss dials. If you must sacrifice your dial pad for convenience of size, make sure your phone comes equipped with voice activated dialing. Obviously this will help you make calls easier, not to mention help you comply with local cell phone laws.
Operating Systems
If you are purchasing a smartphone then you will want to understand a little about the operating systems available. Just like your computer has an operating system, so does your phone. Here are the current operating systems: Windows Mobile OS, Palm OS, Symbian OS, Mac OS, Google Android
Palm OS: Good Productivity Software and Easy Learning Curve
Microsoft OS: Microsoft Office and Great Phone Compatibility
Symbian OS: Good Productivity Software but LessUser Friendly
Mac OS: Optional Paid Download Applications
Google Android: Optional Download Applications
Common Cellular Phone Features
Mobile phones come with all types of internal management features such as phone book, calendar, speed dial, call history, voice activated dialing, photo albums, dial pad lock, and more. As well, many phones come equipped with hardwired features such as speaker phone, cameras, and even walkie talkie features. As you can imagine, there are many additional options that you may want or need so pay close attention to features available with the phone you would like to buy and make sure it is going to perform all the tasks you require .
Headsets
If you drive while using your phone or just prefer to not have your phone pressed up against your face throughout the day, a headset will be an accessory you will be wanting to have with yours. In many cases it will come with a headset, but if not you can pick up one for a fair price. Typical headsets are attached to a wire and in the case you don’t want wires make sure you get a bluetooth equipped phone for wireless conversations. Most smartphones come bluetooth equipped.
Choosing Your Cell Phone Provider
While many wireless carriers will boast in their commercials of their network reliability, only usage will tell. Ask friends and co-workers which networks they use for their phones and if you still are not sure go with a carrier that gives you a 30 day trial basis. The major carriers with the most vast networks are Verizon, AT&T, Sprint, Nextel, and T-Mobile. It is suggested you go with one of these carriers for the best chance at getting reliable coverage.
Choosing Your Calling Plan
National calling plans are usually the best packaged deal, even if you use your phone locally. Always try to find a plan that offers free roaming, roaming charges can soar if you ever leave your network and many people don’t even know when they have so controlling roaming costs can be difficult. If you travel outside the country, international roaming is a package add-on must.
Choosing Your Data Plan
If you plan on using your phone for email and the web then a data plan is something you will want either bundled or added on to your monthly bill. Accessing the Internet without such a plan can run into the hundreds when charged by the minute and at a higher price.
Choosing Your Minutes
Free nights and weekends may have you thinking you need less minutes, but be warned, each carrier has their own definition of what “night time” is. Make sure you know when your calls are free and what time their weekends start and end. Pick a minute plan that goes over what you think you’ll use to spare yourself the bill of going over. Minutes go up in price once you max your limit. If the minute plans look to complex because of the amount of minutes, divide them by 60 to get the numerical equal in hours.
Your Contract
The best deals always come with the lengthier contract. 2-3 year contracts usually allow you to get the best calling plan as well as the best phones for less or free. While this may be the route you wish to go, remember that leaving earlier can be very costly when it comes to cancellation fees. If your phone is expensive, make sure to get a warranty and insurance plan for your phone so if anything happens to it, it can be replaced.
Replacing Your Home Phone?
If replacing your home phone then making sure your service will include E911 is going to be vital for obvious safety reasons. Ask your provider and inform them you are replacing you home phone.
Aaron Siegel writes for TopSavings.Net which offers many great ways to buy cell phones online. They also offer VoIP, Internet, phone leads, phone services, and more. Visit http://topsavings.net/cell-phones.html for more information.
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Digital Camera Buying Guide
Planning to buy a digital camera? Not sure how to get started?
Read on to discover how…..
What do you need the camera for?
If you buy a simple one that can be used at home, you will not get interesting capabilities that you need for taking really good photographic pictures. On the other hand, it would be a waste of your money if you have the latest digital camera only to be used for personal photos at home.
Based on the purpose one can choose from the following main three types.
· Point and shoot: – reasonably compact, with features and size like 35mm cameras.
· Lifestyle: – with moderate features, it’s sleek and compact, so you can carry it around with ease.
· Professional: – with interchangeable lenses, flashes and other accessories, this camera is robust and feature laden, just the right choice for a professional or serious photographer.
These are the important features to look for?
Pixel resolution
Digital images are made up of dots called pixels. The higher the number of pixels in your image, the better will be the quality of the image. This will therefore enable you to enlarge your image to higher pixel dimensions without creating a pixilated (broken) image.
Compression
Compression shrinks a photo’s file size, thus accommodating more images in the memory card. However compression causes a small amount of data loss. If you need the absolute best-quality images, you have to consider buying a camera that takes uncompressed photos but will accommodate less number of images.
Memory
A camera’s memory size will decide the number of images that can be stored. Memory of 128MB will be good enough if you want to use the camera mostly at a social do or a party. If you are on a vacation or when you cannot download images for days at a stretch, a memory of 512MB to 1GB will be most favorable.
LCD screen
Most digital cameras come with at least an optical viewfinder but many digital cameras also come with an LCD screen built into the back. For a digital camera, they vary from 1.5-2.5 inches.
Lens
It is the length of a camera’s lens that determines how much of a scene will fit in a picture. A “Normal” lens is about 50mm, most closely approximate to what your eye sees.
Optical zoom
This enables the photographer to zoom in on an object without any problem in picture quality. Depending on the magnification number, you can zoom in more.
Digital zoom
This feature enables the photographer to zoom in on the centre of the picture by removing the edges of the image.
Focus an exposure
In most cameras, the correct exposure for the lighting conditions is automatically determined. A camera rated ISO 100, has approximately the same light sensitivity as that of a traditional film camera loaded with ISO 100 film. A higher ISO rating means that the camera is more sensitive to light and is potential enough to take pictures in darker settings.
Audio and Movie capture
This feature allows you to record sounds and moving images at the same time, in exactly the same way that a camcorder functions. Some digital cameras provide the facility to record a few seconds of audio with each shot, thus letting you add a personal sound bite to your photos.
Movie mode
This is a feature that lets you take short film clips with your camera. The total record length is typically limited to 10 to 90 seconds.
Flash
Most digital cameras come with an in-built flash. Some cameras however include additional features, such as red-eye reduction or night portrait mode.
Image erase
Most cameras also let you select pictures to erase. This handy feature gives you the chance to edit out the photos you don’t want in order to create space in the memory.
Self-timer
A self-timer allows your digital camera for a delayed exposure, usually giving you about 10 seconds before the picture is taken.
Computer connections
Most high-end cameras have software and connections for both Mac and PC computers. However it is necessary to make sure the digital camera you want is compatible with your platform before you buy it.
Image stabilization
This feature enables the photographer to capture still images of something moving very fast.
Printing
Nowadays you can buy special printers, depending on the compatibility of your camera, to print off your pictures without connecting it to a PC. This applies both for digital and SLR Professional cameras.
How important is size and portability to you?
Size is another very important factor to consider. If you are to use the camera for non professional purposes the size has to be small as you cannot afford to carry huge sized cameras when you are enjoying a trip.
What is your budget?
Based on the budget the features will vary and the overall offering of a camera. Today’s digital cameras run anywhere from Rs 800 to Rs 30,000, depending on resolution and features. While the initial expense of a digital camera is still high you may find that the added convenience and savings in film and processing costs are worth it.
Monty Alexander is a well known author and has written many articles on many topics including online shopping and home shopping
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Wireless Survivor’s Guide: Surviving 2.4GHz at Low Power
Executive Summary
What do wireless sensor networks, industrial wireless sense and control and the growing demand for personal area networks have in common? Two-things: Wireless and ultra low-power. Historically these two have always been contradictory to each other due to the physics and energy required to transmit signals as well as recently in response to the growing number of wireless solutionsâspectrum congestion. If you thought the 2.4-GHz wireless spectrum is overcrowded now, letâs review some of the emerging wireless technologies that will soon join the party. A quick review of the 2009 International CES list of innovations honorees as well as exhibitors includes: Several Wireless-N Gigabit Network Routers, Wireless HD Video/Audio, Wireless Blu-ray Players, Wireless Earphones/Speakers, Wireless Sensor Networks, and the list goes on; and this is just from the annual consumer electronics show. The list exponentially grows when you include lighting control, home automation, automated meter reading, commercial building control and automation as well as industrial process control and automation applications. We are witnesses to an exciting wireless evolution! This evolution has taken foot thanks to the many innovations in the wireless technologies themselves as well as the radios that are used to transmit and receive their signalsâitâs obvious that we would not be where we are today if every wireless application required large and cumbersome power sources or if they had to be recharged every hour or two.
How have the 2.4-GHz wireless technologies adapted to meet these requirements? For embedded wireless solutions, the answer has historically been to reduce the power consumption of the components that make up the solutionâthe microcontroller and the radio transceiver. This Mooreâs law-like response continues to improve, however, now at a rate of diminishing returns. What was 100s to 10s of milliamp improvements in power savings is now nearing 5 and 1 milliamp differences in efficiency. So, whatâs next? How do we continue improving power efficiency in our embedded wireless systems? As with most innovations, we need to think outside the box and look at these solutions within the context of the systems they serve. In particular, instead of a focus on just the power efficiencies of the components within the system we must look at their interactions in the system. I propose the most important factors that play a role in further increasing these efficiencies is a combination of protocol or algorithm that adapts to changes within the environment as well as system functions and capabilities that increase reliable communications between system devices and reduce the number of wireless transmissions. In this article Iâll highlight how these two changes in how we view embedded wireless solutions can help developers and designers survive the 2.4-GHz spectrum at low power.
Adapting to the Environment
Adapting to the environment is an evolutionary efficiency that runs within our DNA. If the world had no land masses or even fewer land masses then it does, we might all have webbed feet and possibly even gills as our DNA would naturally evolve and with natural selection, only the strong and best adapted for the environment would survive. In a similar context, wireless technologies that have the ability to adapt to the increasingly overcrowded RF environments will surviveâand, through the law of transitivity, so will the systems they serve.
Adaptation, in the context of wireless technologies, is the ability of a system to measure and respond to the hostilities that face themâmainly, RF interference. A system that can detect RF interference, or the impacts of that interference, can then appropriately apply countermeasures to respond. For example, letâs assume we have a wireless technology that can measure the receive signal strength of a communication transaction. Based on this signal strength and known baselines for ideal and harsh environments, a technology can then know what the environment looks like and how ideal or harsh the environment is. A less elegant means of knowing the environment could include detecting failed communication attempts as well. The latter method, however, becomes a more reactive approach to triggering adaptation and thus would be less efficient but just as effective in the end. Regardless the method for evaluating and understanding the environment, the next step is to be able to respondâthe physical action of adapting to the environment.The act of adapting to the environment for embedded wireless technologies is fairly broad but can include actions such as changing power output levelsâtalking softer or louder, activating a more robust means of communicatingâtalking clearer, boosting the speed of communicatingâtalking faster, or moving to a quieter environment to communicate. The first response of changing the output power in response to the environment makes clear logical sense in terms of reducing power outputs in a quiet RF environment, can be counter-intuitive in terms of the reverse. In a noisy environment and in an embedded wireless application where power is like gold, the act of using more power to get the same communications across sounds costly. But letâs review what happens if you donât. Assuming all other factors the same and constant, a radio that is transmitting at lowerthan- needed power levels to complete a communications transaction will repeatedly try to transmit the data over a short period of time and more-than-likely, burn more power than a solution that immediately transmits the same data in fewer attempts at a higher power output. Letâs throw some math into this example to help explain this counter-intuitive approach. First, the configuration: one radio is configured to transmit at +4dBm, or 34.1mA, per transaction and a second radio is configured to transmit at -5dBm, or 20.8mA, per transaction. Power required to transmit the data is defined as the number of attempts multiplied by the power per transaction for each of the radios. In this case, itâs very clear that if the +4dBm radio can transmit the data in one pass while the other, -5dBm radio, takes more than one attempt; the +4dBm radio burned less power to get the same data across. Whatâs important here though, is a systemâs capability to dynamically increase or decrease the power required in response to the environmentâuse more power when needed and conserve when not needed. Another means of responding to the RF environment is the ability to speak slower & clearer or, its inverse, faster. In a harsh environment, if a system can dynamically activate a slower but more robust means of communicating, it may be able to improve its ability to deal with the impacts of the interference without impacting its communication.
Here are two examples of doing just this:
using modulation schemes such as Direct Sequence Spread Spectrum; and
advanced forward error correction to the date in-transit. Direct Sequence Spread Spectrum (DSSS) is a modulation scheme that essentially spreads its signal over a relatively wider signal that allows more of the original signal to be received even if there is a higher-power signal in the same area of the spectrum. Another use of DSSS is to take the underlying principles and apply it to the data portion of a packet being transmitted and in the end have a more robust means of forward error correction. In the latter, for example, one can then encode a smaller chunk of data across a larger data packet and then transmit that data packet. In doing this, the system can then deal with interference and still get the message across.
The inverse of this method of adaptation is to know when interference is less of a concern and to take advantage of the quieter environment by transmitting at a faster yet less robust means. Again, the important aspect of these methods to adapt to the environment is the dynamic means of switching between these two approaches.
Finally, the next available method, but certainly not the last, is to respond by physically moving to a quieter environment in the presence of noise. Two methods employed today by some technologies include a constant and predictable means of moving around the spectrum as well as another approach that only moves when required. While both are relatively effective, the latter is more efficient because 1) the system moves less often; and 2) the system locates and moves to quiet environments rather than a constant hop that can result in moving to less than ideal areas of the spectrum at times.
As with most responses to challenges, the best approach to adaptation is for a system to be able to dynamically adapt across all three of these dimensions. A system that can detect and respond with a multitude of countermeasures will be better able to adapt to a wider variety of environments while minimizing its power consumption.
Reliability = Efficiency
Because of its importance, letâs further discuss how reliability leads to better power-efficiencies in a system. Reliability in this context is the ability of a wireless solution to communicate with minimal retransmissions. Retransmission, as we previously saw, is an expensive means of communicating and by no means is a method of adapting to a RF environment. How many times have we heard the cliché, Work Smarter not Harder? This is true in RF systems as well. A response to increase a systemâs reliability to overcome a harsh environment is clearly working smarter while the act of constant retransmissions to get the same data across is the act of working harder and is less efficient. When does reliability come at the cost of efficiency? When the application of the technology does not need the added redundancy or robustness that may be applied to boost reliability. So, as previously stated, the ultimate enabler for efficiency and thus the ability to survive in the 2.4-GHz spectrum at low-power is the ability to adapt to your environment, or more importantly, your customerâs diverse environments.
Conclusion
So, how does one compare wireless technologies to determine whether one is more efficient than the other? To quantitatively evaluate both is to put each to the test in an environment consistent with that of the end application. While costly and time consuming, this method results in the best analysis and provides the truest indicator as to which solution will result in the best efficiencies. A qualitative analysis, on the other hand, can provide a less expensive and timely means to evaluate these solutionsâor to reduce the number of solutions you wish to take to the quantitative analysis. This can easily be done by means of simply answering the following questions for each of the proposed solutionsâthe more yesâs then the more that system will be able to adapt to its environment and the more efficient that solution will be in the end.
Product Marketing Manager,Cypress Semiconductor Corp.
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Wireless Microphones Buying Guide
Wireless Microphone Buying Guide
A wireless microphone is all about convenience and a great sound quality at the same time. As the name implies, a wireless or cordless microphone is a device that has no cables altogether. It is a higher version of a typical wired microphone apart from the fact that this model is cordless and bit bigger than the conventional microphone as it houses a battery pack and he transmitter. With some of the great technological features, the wireless microphone is nearly getting perfect in all the aspects like interference, range, battery life, and sound quality. That is why, in today’s scenario, the wireless microphone is extremely popular and comes handy for any onstage performance.
The wireless microphone is very much beneficial for the professionals as it gives them freedom to use the stage at will without the tangling of cables anymore. Such freedom is required for any music concert, presentation, karaoke, competitions, and many other such events, which calls for absolute flexibility without compromising on the sound quality. That is where the wireless microphone comes as an apposite solution. As come the advantages, so are the disadvantages of using a wireless microphone. For instance, a wireless microphone can help you to get rid of the cabling problems of a typical wired microphone, generally caused by constant moving and stressing the cables but at the same time, many of the models offer a limited range that makes them useable within a range of 100 meters. Another typical problem still faced with some low-end wireless microphones is of the interference with other radio equipment or other microphones. The answer to this issue can be found in the new models well equipped with many frequency-synthesized switch-selectable channels. Another typical problem faced with the wireless microphone is of the operations time as it works on the battery.
That is why we have some suggestions that will help you to choose the right kind of wireless microphone from the available lot of products. Here is a buying guide for wireless microphones.
Step#1
Make a list of features you want in the wireless microphone. This can include range, operation time, no. of channels, and other important aspects.
Step#2
Once you have defined your requirement, you are now ready to search for the right model from the available range of wireless microphones.
Step#3
Identify if a body pack microphone or a standard handheld microphone fits the bill. They offer the same features but can be used differently. In the body-pack microphone the body-pack is a small box, generally the size of a cigarette packet, houses the transmitter and the battery pack. The body-pack transmitter easily clips to the user’s belt or can be worn on the body. Whereas a handheld wireless microphone is more like the conventional microphone with the basic difference being that in place of the cable this is bit bigger to house the transmitter and the battery pack.
Step#4
Once you have decided on that, it is time to look at the prices of the short listed microphones. Compare the products well and then make your choice.
Step#5
Before you finalize a wireless microphone make sure to take a trial if you are shopping physically. If shopping online, make sure to read the reviews carefully.
Looking for more information on Buying Wireless Microphones check out www.WIRELESS-MICROPHONES.NET” target=”_blank”>www.WIRELESS-MICROPHONES.NET?”>www.WIRELESS-MICROPHONES.NET your guide to Wireless Microphones Buying.
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Underwater Digital Cameras: A Brief guide for Buying
Underwater digital cameras are a special designed digital camera make for still and video photography to capture the wonderful marine life flora and fauna. The underwater world offers so many opportunities object to capture once in your lifetime photos of undersea life, vivid colors of coral reefs. This time, underwater digital cameras give you clean and crisp pictures that truly reflect the images of marine and plant life of depths underwater.
With underwater digital cameras you are possible to capture images in a life-like picture that can be shared with friends or you sell it professionally. Adorned with multi-flash function, color correction filter and macro lens, the underwater digital camera offers superb image quality.
If you nosy which model of underwater digital camera to choose, what features to consider, then here is a briefly guide and tips on the features of the most demanding underwater digital camera models. Right now you can find so many popular underwater digital cameras such as Intova IC-700 7.0MP, Sea Live DC800, Nikon D3 plus housing Sea&Sea MDX-D3, Panasonic SDR, Sony A200 Digital SLR Camera combine with Ikelite housing, o Xacti VPC, Pentax Optio W30, Canon G10 and Olympus SW series
Intova IC-700 7.0MP digital camera with underwater housing, available in an affordable price. This underwater digital camera features 7 megapixels, macro mode and built-in flash that can reach up to five feet underwater.
The SeaLife DC800 underwater camera offers sleek, modern design with high-tech functionality. Come with 8-megapixel camera now you could have the best possible photographs, both in and out of the water. This new type promise give the easiest step to set up a graphic on-screen, expand the camera with wide angle lens and Digital Pro Flashes accessories. This camera also have long lasting lithium battery for all day of diving, automatic focus from 2″ to infinity, large format continuous video recording with sound, depth tested to 200ft, fully rubber armored for shock protection and 1-year warranty covers the underwater housing and camera.
If you looking for popular underwater digital came among professional diving photographers, the answer is Nikon D3 underwater digital cameras. This camera is top line in technology and prize in front of its competitors. Released with a perfect auto exposure, huge viewfinder and accurate auto and fast, Nikon D3 completed with ergonomically Sea&Sea MDX-D3 housing. This 10-megapixel camera has features specifically designed to allow for the best possible photographs, both in and out of the water.
Panasonic SDR-SW20 is compact model for you if you want an easy-to-use and lightweight device. Include 10x optical zoom and MPEG-2 format up to 10 Mbps, this is one of the best digital cameras available for video recording. But, with only 0.3MP 640×480 still imaging capability, the still imaging options are basically non-existent in this model.
Combine with Ikelite Housing Sony DSC-W5 5.1 Megapixel Cyber-shot digital Camera is an entry level digital camera that could captures enough detail for photo quality prints. It has solid construction and offers all of the essentials in an affordable package like an auto-focus system, a large view finder, wireless flash control and gives details at the lowest sensitivities. Its also built-in multimode auto electronic-flash Real Imaging Processor provides natural color, accurate picture quality and faster response 2.0 High-Speed USB Memory Stick media, Memory Stick(R) PRO media compatible PictBridge capability for plug-and-print convenience . Sony DSC-W5 5.1 Megapixel Cyber-shot(R) with Ikelite housing will give you a compact, clear underwater with corrosion-free performance and deep under.
Sanyo Xacti VPC-E1 is the one of the best designed underwater digital camera for up to 5feet depth of water. It has 4GB card, and MPEG-4 AVC/H.264 at 640×480 powers, the Xacti E1 could work with an approximate record time of over 5 hours. This camera also offers a solid 5x optical zoom with a 6MP CCD at up to ISO1600 power for still images, Flip out view screen is a special key feature of this underwater digital camera which will saves you from the risk of bumping in with underwater objects while swimming around.
Pentax Optio W30 is another underwater digital camera you should consider. Released with 7MP – ISO1600 and 3x optical zoom image recording feature, Optio W30 supported with both SD and SDHC, videos in this model is of 640×480 in MOV QuickTime MJPEG format.
The Canon G10-WP combine with DB28 housing is a Canon’s most advanced compact cameras with ability to work under water till 130 feet deep. With well-rounded underwater digital camera package Canon G-10 will gives you richly detailed and high resolution images, It is also has an excellent LCD, wide-angle lens and many dedicated controls, it gives you good performance like serious photographers.
Olympus SW series may be the best well rounded underwater camera at the moment. This camera completed with 10 Megapixels, ISO1600, and a 3.6x optical zoom feature and you could dive with this camera as depth as 6.6 feet.
Founder and owner of http://buycamera-s.com
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