Mobile Phones – From Analog to Digital

When the first mobile phones came out of the market, many people were amazed by the advancement in its technology. Indeed, it was simply amazing for a very small piece of communication equipment to be able to send and transmit messages in voice. It was more clearly advantageous than a two way radio that were the fad during those days in which you can only call your base stations and other radio handset users linked to your channel. Most of those people who uses two way radios were hobbyist or employees of a company with a base to contact field employees to monitor their whereabouts. The advantage of a mobile phone compared to these two-way radios was the longer reaching power of a cell phone, whereas a two-way radio is limited in its range of operation.

At this stage, however, mobile phones although utilizing already the cell technology through channel reuse, was still considered as in its infant stage as the carrier it utilizes is the analog technology. But first, so that you may understand better the workings of a mobile phone, let me explain about the term channel reuse. You see, radio signals operate on a particular frequency. These radio signals, in order to be free of interference, should operate on a different frequency. Like if a certain radio frequency is on 120 MHz, another radio frequency should be in another frequency to avoid mixing signals with the radio signal that is already operating in the 120 MHz frequency. But in the case of mobile phones, many of these units operate in the same frequency, through the principle of channel reuse, thereby making the mobile phones used by many people. Channel reuse was made possible by providing limited power to every mobile phone unit and providing many cell sites or towers. Thus a mobile phone can relay and receive signal only to the nearest cell site or tower nearest to it and not affect another cell tower on another location, making it possible for other cell phones on the same channel to send and receive signals on other cell sites or towers without interference.

Now that you have a good idea how cell phone operates, let us go back to the first carrier used by mobile phones which is the Analog system of carrying radio signals. This kind of radio signals carriers are the up and down frequencies of radio transmissions that were used in all forms of radio messages before the advent of digital technology. A very good example of these signals can be seen on hospital operating rooms that are usually in TV and movies depicting the near death of an individual as shown by the up and down movement of a moving light on a monitor graph. The up and down light that you see moving is an analog signal frequency, depicting the sound of a patient’s heartbeat.

When digital signals became available to be used in radio communications, it was found out that the system of channel reuse employed on mobile phones is more adapted to using the digital system of carrying signals as digital are not susceptible to interference unlike analog. Thus, telecommunication companies soon begun to reconstruct their signaling system to adapt to the digital system of signal delivery in mobile phones. Read the rest of this entry »

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Characteristics of the Tablet PC

A (Tablet PC) handheld tablet computer is a computer device that has almost all the characteristics of the widely used desktop computer. Most tablet computers are designed with a touch sensitive screen which acts like their main input device and which the panel computer is equipped to use and operate using.

The term was first popularized by Microsoft early in 2001, although the term tablet PC’s is now used widely to refer to any portable slate-sized tablet computer, even if the portable computer is not using the operating system of Microsoft but another operating system. Most tablets today use virtual keyboards plus handwriting recognizing software’s for text input through the tablets touch screens.

Almost all handheld tablet computers use wireless adapters to connect to the Internet and local area connections. Tablets today make use of software applications, which include web browsers, games, office suites, and a wide range of other applications.

Most tablet manufacturers make their tablet using the universal 12″ size format, with screen resolutions of 800×1280 pixels. When tablet computers were being introduced they were meant to replace the newspaper, same as how the typewriter was replaced by the typewriter.

The handheld computer has been in rotation for quite some time now, quietly some high-tech tablet computer enterprises slowly lined up and launched tablet versions of touch-screen sensitive tablet machines, which at the same time were keyboard free. The tablets that were manufactured by these establishments gripped the thoughts of bloggers, tech executives, gadget hound and bloggers who even began projecting their dreams onto the tablet sized computers.

Today, the tablet PC is seen as the savior of book publishers and newspaper publishing industries. The tablets provide another way of watching movies and TV shows, while playing games. Tablets provide a rich visual way of enjoying the trappings of the web plus the ever-growing world of applications that are suited for the mobile phone. Most tablet gadgets are designed to entertain, inform and offer services that can locate places also as dictionaries. Other tablets also make use of the 2-way communication systems and sharing services which are real-time based. Read the rest of this entry »

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Introduction to the iPhone

iPhone is known popularly in the world as a smartphone. The main features of an iPhone, other than enabling messaging and Internet connectivity are its hardware, applications and media.

Regarding the hardware of iPhone, it is based on a touchscreen technology. It does not include a physical keypad. Rather, on its touch screen, it makes available for you a virtual keypad and keyboard for performing specific tasks. Due to the absence of a physical keypad, touchscreen of the iPhone appears much larger, if you compare it to any cell phone of the similar size.

An accelerometer in the iPhone allows this device to change the display, depending on whether you view it vertically or horizontally. iPhone, as a useful electronic gadget, even includes one flash drive located internally for storing data. Other features of the iPhone hardware include light sensor, digital camera, speaker, proximity sensor, Bluetooth, WiFi connectivity and Global Positioning System or GPS.

As for the iPhone applications, they are diverse. iPhone possesses certain applications that allow this gadget to perform various tasks. In addition, applications display on map the location of your iPhone through the GPS feature. They also help you in selecting local restaurants, play games and display catchy images on your iPhone. The iPhone manufacturer as well as third party organizations develop applications for this device.

Apart from using your iPhone merely as a cell phone to send and receive calls, you may use it as one effective media player. You may easily transfer songs from any home computer to the iPhone’s internal memory. You may also view documents and photographs on the color screen of your iPhone and watch videos in motion. Read the rest of this entry »

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