proyecto de ingles sobre la evolucion de los telefonos.pptx

Evolucion de los telefonos

1. Invention THE PHONE

2. The cell phone is an independent telecommunication device. It allows you to perform various operations such as calls, text messages and, more recently, access to the Internet and various digital applications. It is an indispensable device in today's world, whose history evidences the great technological changes that societies have undergone since the end of the 20th century. THE PHONE

3. However, for the cell phone or even the cordless phone to be possible, radio had to be discovered as well. In other words, the cell phone required the development of the transmission of information via electromagnetic waves and, later, through satellite microwaves. Once these two technologies were discovered, it was a matter of time until the first “wireless” phones appeared.

4. In the 1980s, Ameritech Mobile Communications, LLC, the first company to provide cell phone service, appeared. For this, it used frequency modulated analogue radio channels. Some of the first telephones of this type were from the Ericsson company, brand NMT 450. First generation

5. The second generation of cell phones was born in the 1990s. It used GSM systems and frequencies between 900 and 1800 MHz, which represented the step towards the digitization of cellular communications. Improved voice quality and security levels. Second generation

6. In a short time, EMS and MMS technology was incorporated into the second generation, thus allowing text messaging and multimedia messaging to existing cell phones. In many cases the functionality was limited to receiving them, but it didn't take long for units capable of emitting them to appear.

7. At the beginning of the 21st century, the third generation responded to the need for cell phones with Internet connectivity, video conferencing, television, and file downloads, that is, small computers. Third generation

8. This is the generation of "High-end" Smartphones or higher capacities, thanks to their high-speed Internet connection and reception of HD videos. It is the technology currently used in advanced companies in the world of mobile telephony, and is considered the technological evolution of mobile telephony. Fourth generation

9. The fifth generation of cell phones is currently under development. Powerful companies such as China's Huawei and Russia's Megafon have been testing since 2014 to manufacture a new generation of technology. Fifth generation

10. Thanks for your attention