When subject to electric current the crystals untwist to a perfect degree to filter white light emitted by a lamp placed behind the screen, in the case of Flat panel TV’s or trough a small LCD chip projection , in the case of Projection T.V.

LCD monitors produce color through a subtraction process. They block away color wavelengths of particular color for white light spectrum until they are left with the correct color. The light’s intensity allowed to transmit via this liquid crystal matrix enables LCD TVs to display a wide variety of colors.

LED TV’s are a new type of LCD’s. The LED’s panel is still that of an LCD and operates with the same crystal technology. The difference is the backlight changing from fluorescent to that based on LED (light emitting diode).

Regarding color performance, LCD TV’s reproduce colors by manipulating light waves and subtracting colors from white light. This is basically a difficult way to maintain accuracy and vibrancy of color. LCD’s however produce a brighter picture. It will suit a room with lots of ambient light.

LCD TV makers have done a great deal to improve the viewing angles of their displays. The best LCD TV’s have around 120 degree viewing angles.

But LCD TV’s suffer from trailer effects when individual pixels are slightly out of sync with image on screen. During fast moving scenes a discerning eye can detect this motion lag. This applies to both fluorescent backlit LCD’s and LED backed LCD’s.

LCD TV’s are also preferred on aero planes. They are not affected by increase or decrease in air pressure. They perform consistently regardless of the altitude they are operated in.

Regarding longevity, there is little to wear out in an LCD TV except for backlighting. But the fluorescent backlighting in LCD’s cannot be replaced cost effectively. LED backlit LCD’s last for a long time.

But first there is the issue of Installation. There are two types of installation done by people. General Audio installation consists of usually a head unit, one or two amplifiers, splits, and either a pair of 6 x 9 speakers or a sub woofer to take care of bass. The other installation is for competition Sound-offs. These are also named as Decibels (DB).The purpose of competition is to get the highest DB through a sensitive microphone installed at an exact point in all cars.

Then come the components of the audio system.

First is the Head Unit-It is the primary control system for the car audio unit and is installed in the dash panel between the driver and the passenger. It contains various media devices such as radio receiver/ tuner, a tape player, a CD player or an MP3 player

Next come the speakers. They are similar to other loud speakers but adapted to mobile usage. They are multi axially mounted and come in non circular cone shapes for ergonomic design. In modern design speakers are placed at the dash or front deck, the rear deck, the kick panel or the doors.

Amplifier: A dedicated amplifier separated from other parts of the music systems in car audio. Most head units have an amplifier. They convert low power signals received by car speakers to high power signals thus improving their quality of sound and loudness. Most amplifiers work with a Pre-amp which delivers initial boost to low power signals before sending them to the amplifier.

Sub woofers: Play an important role in car audio. Reproduce sound in the lowest frequencies that are audible and that which produces a deep bass that makes the car vibrate. It makes sound come alive better than a standard speaker. It is usually installed at the centre of the trunk of the car to evenly distribute sound.

Capacitors: They are used to store energy which is drawn up by the amplifier. They cater to the short burst of electrical demands of a car audio system that have exceeded the electrical capabilities of the vehicle.

All these components together make for a fully functional Car Audio System

Most smart phones and cell phones are tied to a single service provider like Verizon wireless, Sprint, AT&T or T-Mobile. Even if you buy the phone from anywhere, you may still have to stick with a particular carrier. For example, if you buy iPhone from any store, you will still have to operate with AT&T’service. Such phones are called as locked phones.

For many reasons, purchasing a locked phone makes sense. The service provider may provide attractive discounts and deals to the phone locked into their service.

But many others may not like being tied down to a single network as in the case of locked phones. For people traveling abroad frequently it does not make sense to carry the same network while traveling as it will cost the earth to make a roaming call. In such a case they would prefer to access local networks while staying abroad and in this case, unlocked cell phones make better sense.

Some people may also not like to sign lengthy contracts with service providers as they are on the move all the time. Unlocked cell phones are better suited to their needs.

So you might consider trying to unlock your cell phone. Some smart phones and cell phones can be unlocked but they require external help. Once you have bought a locked cell phone it is in the interest of the service provider to keep it locked so they make unlocking a difficult process.

Some phones can be unlocked by altering their software but others may require tweaking their hardware. You can ask your service provider to unlock your phone but it is less likely that they will oblige especially if you are still under contract. Now the alternative is to ask a third party to unlock it for you typically for a small fee. But if your phone gets damaged they are under no obligation to replace it.

Take note that it does not make sense to unlock your phone until the present contract period with an existing service provider is completed or you will end up paying for whatever service you do not use.

Unlocked Cell Phones are useful to those who like to change service providers often and those who travel most of the time.

The earliest camcorders used to record to either VHS or Betamax tapes that allowed for convenient playback in video players. They were bulky but quite popular to record family events

In the late 1980’s the camcorders shrank in size. VHS-C tapes were developed which were very small in size but could hold only 40 minute of video. The second innovation was 8 mm tapes. They were much smaller in size than VHS . Though it could support 2 hours of video.

By late 1990’s, most camcorders had shifted to a digital format called Mini DV. The popularity of Mini DV was because of its affordable price tag, excellent quality of video and easy to edit features. The video can be copied to a DVD. The size is much smaller than conventional VHS tapes. A disadvantage is that you cannot locate a particular point during the video, not even by forwarding nor rewinding.

Digital8 camcorders are a different digital alternative to traditional types. They do not have the same utilities as Mini DV technology but are capable of running 8mm tapes. So it is a good way to upgrade from an 8mm setup already in place.

With rising affordability and portability, new varieties of digital camcorders have become popular.

DVD camcorders consist of digital based camcorders that use an in built DVD recorder to record footage directly to DVD media. They have become immensely popular due to affordability and portability.

Flash Camcorders use flash memory to store video. However this memory becomes very small with any thing exceeding 2 GB being ridiculously expensive. So these have not caught up in sales.

Hard drive based machines use internal hard drive to save video. They enjoy the benefit of not using external media and allows for direct copying of video to a hard disk without the intervention of a computer. But for long recordings, this poses a problem as once the hard drive is exhausted, you will require a P.C. to save the initial footage to shoot the latter footage.

The latest in the market are the HDV Camcorders. It produces best quality High definition Video. These are the most expensive models today.

You can popularize your items and let clients know that they can place orders to custom design electronic products from start to finish. You may even fashion your USP as low design costs, fast service and quality products.

You can set up an online catalogue of all your products in your electronic store. You can include a brief description regarding the functioning of each product so that even a novice can grasp the exact way to operate the electronic product.

Online electronic store is gaining popularity as it maintains low costs as well as wide choice of electronic items on display. Most local dealers have a limited variety of products to display to the customer physically. The time is ripe for e- electronic stores which have a wide variety of products to sell.

You can set up an online electronic store as soon as your payment to the host website is paid. Soon after purchase it can be processed and started. The online electronics store would display popular electronic items in deferent categories.

One big advantage of the electronic store is that it would be open 24 hours a day, 7 days a week. You can make money throughout the year, month and day. Also there is neither need to hire employees nor any need to maintain warehouses.

Every order placed is safe and secure. It is encrypted with software that protects your personal information from others. This gives confidence to consumers for buying from you.

There is no need to keep an inventory. The customer’s orders are serviced directly from the manufacturer’s warehouse.

Thus Electronics Stores are good to be made online and also great to buy electronics products from due to the ease of making choice and a simple buying transaction.

There are two kinds of basic fax machines: Ink Jet and Laser. Ink jet uses ink droplets to transfer images and has capacity of 400 pages per cartridge. Laser uses Light emitting diodes to transfer images and has capacity of 5000 pages per cartridge.

The trend is now to have all-in-one fax machines. This implies printer, copier, fax and scanner all in one machine. The advantage is that you have all the facilities of printing, copying, faxing and scanning in one machine. This avoids the clutter of individual machines especially when you have a premium on space in your home office. It also eliminates the need for multiple electric points. There is an amalgamation of many features in one machine.

The disadvantages are also related to the all-in-one feature. For example if printer is damaged, your function to print incoming faxes is spoilt. You can also lose all the functions at once if you have a problem related to all of them at once like cutting off of power supply.

Once you have selected your fax machine (laser/ ink jet/multipurpose), you can consider the following features:

• Controls must be easy to use and have good layout.
• Size must be adequate to print large documents and books. It must occupy minimum size on desk or stand.
• It must have a resolution of at least 300×300 dpi.
• Ink cartridge must not be costly.
• It must be network/ wireless capable
• Must have a paper tray capable of handling 100 pages minimum
• Speed must be adequate. The Page transmission speed varies according to the models. High volumes require faster speeds.
• There must be minimum sound. Look for noiseless operation.

Choosing the best home office fax machines is always a matter of personal choice and taste. You should weigh the advantages and disadvantages of each fax machine as you purchase for the home office. For instance, multi-function fax machines will k help to conserve space and electricity in a home office. An ink jet fax machine would be cheap while a Laser Printer will be cost effective in the long run in terms of pages per cartridge.

Some of the advantages of computers are as follows:

Computers help in the sphere of writing.They have utilities like editing, copy, pasting as well as spell check and thesaurus. You can proof read a document very fast using spell check and you need not open a dictionary to check words. Reorganizing matter is made easy by editing, cut, copy and paste. Also you can print, save and create documents as you wish.

One of the biggest uses of computers is the facility of the Internet. Internet is a world wide network of computers connected to each other. The World Wide Web is an enormous source of information that can be accessed via the internet.

E-mail is electronic mail- a system of mailing via the internet which helps to create, store and forward mails. One can manipulate text messages as well as audio-visual material. One can upload and download messages and video as well as indulge in online chatting. E-mails and online chatting are much cheaper compared to telephonic conversations. There are also many games available and Online gaming is a popular activity. Also there are a number of uses of the internet like reading news, weather, consulting for advice on a variety of topics, purchasing objects, seeking employment, doing research on disease and medicine, paying taxes, making travel and hotel bookings etc.

Computers are also used for training and education purposes. Computers have become a learning aid for students. Many universities offer online degrees. Online education is a flexible and convenient form of education. Computers are also used by organizations to train their staff. The latest trend is to conduct online examinations.

Then there are miscellaneous uses of computers. It is use in Flight Simulation: in training pilots without wasting costly planes. It is used in automated industrial monitoring and control. It is used in geoseismic surveying- to capture acoustic reflections from a survey boat and to perform ultra specific navigation. In medical industry, computers are part of electrocardiograph machines etc. In the entertainment field, your DVD Player, cable box, TV and CD player all consist of something related to computers.

]]> http://www.webelectronicsstore.com/reviews/what-are-the-advantages-of-computers/feed/ http://www.webelectronicsstore.com/reviews/the-functioning-of-gps/ http://www.webelectronicsstore.com/reviews/the-functioning-of-gps/#comments Tue, 29 Dec 2009 01:15:51 +0000 atul http://www.webelectronicsstore.com/reviews/?p=161 The Global Positioning System (GPS) is a navigation system consisting of a network of 24 satellites. These satellites are placed into orbit by US department of defense. It was intended basically for military use though in the 1980’s it was allowed for civilian use.

The GPS works 24 hours a day, everywhere in the world, in any weather conditions. One can use the GPS without any charge.

GPS satellites orbits the earth twice in a day in a set orbit and are engaged in transmitting signals to the earth. Receivers use this transmitted information to decide the location of the person. Basically it calculates the difference between the time the signal is sent by a satellite with that taken to receive it. The difference in time reveals how distant the satellite is. Next the distance from some more satellites is measured and the receiver is able to determine the exact location of the user.

A GPS recover must be attached to the signal of minimum 3 satellites to determine 2 D position (longitude and latitude) and keep track of his movement. With 4 and more satellites, a 3 D position can be ascertained (altitude also). Once location is established other data like speed, distance etc can be calculated.

GPS is free for everyone. Anyone with a receiver will be provided location and time. The GPS consists of three sections: Satellites circling the earth, earthly monitoring and control stations and GPS receivers.

One can purchase GPS receivers readily available in the market. With these receivers one can correctly place where one is and easily proceed to your destination whether by driving, boating or flying.

GPS has evolved to a main transportation system, providing direction for ground, aviation and maritime movements. Emergency services rely on GPS for timing and location services to help support rescue missions.

Accurate timing provided by GPS helps in operations such as mobile phone operations, power grids control and banking operations. Farmers, scientists and many others perform their functions efficiently using GPS signals.

There are some factors that degrade GPS signals and affect accuracy of their readings: They are Ionosphere and Troposphere delays, receiver clock errors, orbital errors and purposeful degradation by US department of defense for defense purposes.

Some of the main types of TV’s are as follows:

1. Cathode Ray Tube: CRT as it was known generally uses cathode ray tube as a picture device and is part of the standard television of recent times. An electrons stream is fired at a big phosphor coated screen, creating a moving image. These TV’s are extremely durable and cheap making them popular with those on a budget.

2. Plasma TV: These have created a niche around the world and have a devoted clientele. They are offered as Flat Panel TV’s with the maximum sharp pictures. Plasma screens consist of tiny cells filled with neon or xenon gas embedded in plasma. The cells are charged with electricity and filtered to match a certain color. Plasma offers the sharpest and richest images and a viewing range that makes it comfortable for any person in the room to view. They are flat so they don’t take up much space. But disadvantage is that they are expensive and slightly heavy.

3. LCD TV’s: It is one of the fastest growing and most popular types of TV’s. There are tons of choices in the LCD (Liquid Crystal display) market from flat panel to rear projection. Flat Panels are mostly high in popularity because of their narrow, lightweight body that makes it convenient for people who want to use it as TV as well as computer monitor. LCD TV’s use a screen filled with liquid crystal, backlit by a lamp and which filters the light to create the picture. Like Plasma TV’s they create a highly sharp picture and vibrant colors. They are much lighter than plasma screens and come in competitive sizes as well. But they tend to be more costly than plasma screens. Viewing angles cause a problem and fast moving images can be blurry.

4. DLP’s: Digital Light Processing Televisions are high- end, technologically advanced models. They make use of a DMD (Digital Micro mirror device) chip which is an optical semiconductor that processes light such that viewers have a unique viewing experience. This technology was developed by Texas Instruments. These TV grace the home of the rich and powerful.

The speaker is a crucial consideration because it is the system responsible for real reproduction of sound that emanates from the electrical energy. For any car audio system, the right speakers are vital, because they are the system responsible for actual production of sound emanating from the stereo. While purchasing speakers consider only the higher end and you must carefully look out for certain features and considerations. There are a huge variety of speakers that one will encounter once you go out for purchasing audio systems. Some of them are given as follows.

A woofer is a large speaker capable of reproducing lower frequencies. Then there are mid speakers which are medium sized speakers capable of middle frequency reproduction. Tweeter is quite smaller in size and produces high sounds. Meanwhile, a sub woofer reproduces the lowest sound spectrum and produces a different bass dimension. A super tweeter reproduces the highest spectrum of sound.

Amplifiers are instruments that make use of small pre-amp audio signals, some bit of power from batteries while transporting them as large signals to work speakers. The power available should be enough to derive the highest quality of sound. Amplifiers deliver sound with precision. Originally, factory fitted radios had low power outputs amounting to 3 to 5 watts. Compare that to power output of standard models of recent radios in the market amounting to Forty Five watts X 4. Providing them with 45 watts of maximum power classifies them into a set of amplifiers that are very efficient with a top range of Ninety percent.

Before purchasing audio equipment, it is vital to check the materials for installation and ascertain the price. This is essential so that a car owner is left with an audio system of high quality. So go for the best audio accessories for your car.