Mobile devices - phone, smatphone, tablet


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 Mobile handset           The introductory picture shows one of the more advanced phones. Regarding communication with PTT exchange, mobile devices have entered into service before four decades and more resembled postwar (WW II) radios. As the first commercial mobile phone is considered Motorola 'DynaTAC 8000x' out in 1973th year, the battery had a capacity for about 30 minutes or 8 hours of work mode 'mode' and therefore had the power switch for work. They used an analog frequency modulation of high-frequency signals, the principle of FDMA signal transmission to the operating frequency in the range of approximately 800-900 MHZ and a direct connection to the antenna system PTT central. For this frequency range used is built and telescopic antenna of about 20 cm. Enabled the two basic functionality as the classic telephone: dial a phone number and call.

          Phone at introduction picture is modern version of the original mobile phone. It also provides basic features, but it can save a certain number of phone numbers in the phone book and make it even benefits with regard to handling. Mobile telephone handset uses digitally modulated high-frequency signal in the range of 1.88 GHz to 1.9 GHz for communicating with the 'base' through which the battery of headsets is charging and with PTT central exchanges analog signal, also with all the corresponding signaling characteristic of analog PTT communication. Can still be used for home purposes connected for example at ADSL SOHO device, using a PSTN (Public Switched Telephone Network) standard analog telephone communication (such as scheme according to Figure 3.1a) or VoIP (Voice over IP) capabilities of SOHO device (such as scheme according to Figure 3.1b). Due to the higher operating frequency with a base antenna is smaller and does not have the 'pull' of the chassis.

          Although the use of mobile communications dating back more than four decades, for example radios in vehicles such as taxi, police cars and ambulance, they were not mobile phones because they were not part of the postal cellular network. Could not call the phone number of the vehicle, but everything functioned as a separate telecommunications network that is used by a number of transceiver interconnected systems (nodes), each of which is 'covered' part of the field. Besides former technology, although they had already used semiconductor components, could provide a feature of today's mobile devices, small size and weight and work at higher frequency range 1GHz. But time-wise within a single human lifetime, the development of technology has enabled the gradual development of mobile devices, and is basically a few technological generations that their characteristics are defined mobile phone each of them:

The following figure shows some of the design of individual generation mobile phones.

 Mobile phones
Figure 1.1 Mobile phones through the generations.

Using a variety of program support for mobile phones to distribute malicious programs and protective measures become obligatory, like computing devices. Of course, all of this has enabled enormous miniaturization and integration of electronic components. Since this is a phone + Internet service, it is understood that this is a full-duplex communication and are therefore required transmitting and receiving subchannel.

Top mobile phones today except for essential purposes - cellular telephone systems - is a plenty of options: sending SMS messages, GPS navigation, Wi-Fi network access and mobile broadband access, computer access, imaging and recording built-in camera, video communication over the network, watching and listening to media content, browsing integrated program support, the use of a variety of Internet service and yet something, and all of the above achievable through orders given through the touch screen. About all this care any operating system, of which the most blunt: Symbian, Windows Mobile, iOS, Android and PalmOS. Therefore, they do not even call mobile phones (cell phone) but SMARTPHONE; mobile phones with more advanced computing ability and connectivity all sorts of possibilities. Definitely belong to the generation of 4G mobile devices.


When thought about it, according to the hardware capabilities surpass computers made ten years ago. On the screen resolution of 1920×1080px (HD resolution) and the diagonal of 4-6" give a picture of very high quality, according to the density of pixels (even over 400 ppi) much better than a computer monitor and have FLASH memory for persistent storage of data, up to 64 GB. Indisputable is that mobile devices are the new generation at the pixel density exceeds almost all of the technology preview images for desktops, from CRT to LED monitors. Yet they just lack a system for working with optical media to be completely surpassed computers from the time Windows 95 operating systems.

What certainly looking forward to 'ordinary-casual' user devices are similar and expanded capabilities in relation to the smart phone, with a larger screen diagonal and resolution, usually 7-12" and sometimes higher resolution than HD standard - called TABLET COMPUTER, or simply TABLET. For Laptops and as well as strong competition and called for nothing more laptops. satisfy all customers' business needs, and provide multimedia atmosphere and allow gaming, especially if you enable the connection of various accessories, from classic keyboard onwards - whatever you dream up.

Processor type that mobile devices use completely different concept of processors that use desktops and laptops. This is mainly ARM processor type that uses an abbreviated instruction set (Reduced Instructions Set - RISC), which allows them a solid performance in a small package and low power consumption. Are based on the design of the British corporations 'ARM Holdings' that it has developed since the eighties of the twentieth century, but it does not produce but only designs and then collects license rights from many manufacturers. Interested firms licensed certain performance and the amount of these microprocessors and ordered their production by third party companies that deal only production of integrated circuits. Using the 32 nm and 28 nm process development, a trend is developing 22 nm process. Examples of such processes are the Texas Instruments OMAP, Apple's A4 and A5, Nvidia Tegra, Cortex A15, Intel Atom, and others. Modern technology has made such a miniaturization that the integrated CPU and GPU systems with multiple cores commonplace. Indeed, the GPU unit usually has multiple cores of the CPU unit regarding primary role that mobile devices have - a graphical display and multimedia tasks. On mobile devices are not programmed. Programmed on the development platform for mobile applications.

But this is not a critical factor for all kinds of users. In fact, mobile devices do not have the resources to support the program as CAD products in this segment desktops will remain indispensable, but also regarding the gaming options that are available only with 'muscular' and expensive desktops and laptops. But for the less demanding - ordinary and casual user mobile devices are sufficient. Especially if their main business communications, Internet services and multimedia relaxation. Classic PC computers, laptops, notebooks and gaming consoles to mobile devices have very dangerous competitors. What the device described by these lines is inexpressibly glad they built accelerometers enable automatic display rotation when they change position

It seems that the 'miracle' in the hands of Captain James Tiberius Kirk and Captain Kathryn Janeway from 'Star Trek' is becoming a reality. It would not do that one day 'Terminator' to become a reality.

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