Read and learn the words that will help you to translate the text

7.1 Read and learn the words that will help you to translate the text.

Vocabulary

wireless  communication	беспроводная связь
electromagnetic wave	электромагнитная волна
device	устройство, прибор, приспособление, механизм, аппарат
intrusion alarms	охранная сигнализация
frequency	частота
wireless transmitter	радио передатчик
cordless computer peripherals	беспроводные компьютерные периферийные устройства
modulation	модуляция
binary digital code	двоичный код
Нi-Fi - (High Fidelity)	(высокая достоверность)-технология при которой  улучшение качества цветопередачи происходит путём цветоделения на пять, шесть и более красок
Global positioning system-	глобальная (спутниковая) система (радио)определения местоположения любого объекта, система (GPS)
Global System for Mobile Communication	общеевропейская цифровая система сотовой подвижной радиотелефонной связи стандарта GSM, система GSM
to proliferate	разрастаться(о знаниях) , быстро распространяться
amplitude modulation	амплитудная модуляция
alternating current(AC)	переменный ток
direct current(DC)	постоянный ток
optical signal carrier	несущая (частота)оптический сигнал
via	через, сквозь, по средством
control box	пульт управления, блок управления
video-cassette recorder(VCR)	кассетный видеомагнитофон
wireless communication	беспроводная связь
electromagnetic wave	электромагнитная волна

7.2 Find the definition for each word.

1. wireless communication	A. an electric current that reverses its direction many times a second at regular intervals, typically used in power supplies.
2. electromagnetic wave	B. The number of repetitions per unit time of a complete waveform, as of an electric current.
3. intrusion alarm	C. an electric current flowing in one direction only.
4. frequency	D. a navigational system involving satellites and computers that can determine the latitude and longitude of a receiver on Earth by computing the time difference for signals from different satellites to reach the receiver
5. wireless transmitter	E. A wave of energy having a frequency within the electromagnetic spectrum and propagated as a periodic disturbance of the electromagnetic field when an electric charge oscillates or accelerates.
6. cordless computer peripherals-	F. is a digital mobile telephony system that is widely used in Europe and other parts of the world.
7. modulation	G. to increase or spread at a rapid rate
8. hi-fi	puter hardware used without cord
9. global positioning system	I. the modulation of a wave by varying its amplitude, used especially as a means of broadcasting an audio signal by combining it with a radio carrier wave. Often contrasted with frequency modulation
10. Global System for Mobile Communication	J. an electronic system for reproducing high-fidelity sound from radio or recordings
11. proliferated	K. to communicate with or send communications by wireless
12. amplitude modulation	L. the act or process of superimposing the amplitude, frequency, phase, etc., of a wave or signal onto another wave (the carrier wave) or signal or onto an electron beam
13.alternating current	M. a warning device that is tripped off by the occurrence of a burglary
14. direct current	N. The equipment used for generating and amplifying a radio-frequency carrier signal, modulating the carrier signal with intelligence, and feeding the modulated carrier to an antenna for radiation into space as electromagnetic waves.

7.3 Translate the word combinations:

Electromagnetic waves, to carry signal, range of human hearing, communication devices, to transmit voices and music via wireless, Morse code, wireless equipment, to resurrect, to use overall, portable and mobile applications, to ascertain the location, cordless mouse, Global Positioning System, Global system for Mobile Communication (GSM), General Packet Radio Service (GPRS), Wireless Application Protocol (WAP),  fixed wireless, mobile wireless, IR(infrared) radiation, amplitude modulation, frequency modulation, phase modulation, the network of orbiting satellites.

7.4 Complete the sentences with the words from the table and translate them.

modulation  cellular phones and pagers  amplitude modulation  fixed wireless  mobile wireless  baby monitors Global Positioning System

The way of transmitting information to an electronic or optical signal carrier mainly by turning DC on and off is called___________. ____________is one of the modulation methods in which the voltage applied to the carrier is varied over time. ___________provide connectivity for portable and mobile applications, both personal and business. ____________devices used in homes and offices and particularly, connected to the Internet via specialized modems. ___________devices aboard motorized, moving vehicles, for instance the automotive cell phone. __________ are simplified radio transmitter used at homes by mothers for looking after their babies. A navigational system involving satellites and computers that can determine the latitude and longitude of a receiver on Earth is called_________.

7.5Before you read the text answer the questions:

1.What do you think wireless communication is?

2.Do you know any wireless transmitters and devices? Give your examples.

7.6 Read and translate the text. 

WIRELESS COMMUNICATION

Wireless is a term used to describe telecommunications in which electromagnetic waves carry the signal over part or the entire communication path. Some monitoring devices, such as intrusion alarms, employ acoustic waves at frequencies above the range of human hearing.

The first wireless transmitters went on the air in the early 20th century using radiotelegraphy (Morse code). Later, as modulation made it possible to transmit voices and music via wireless, the medium came to be called "radio." With the advent of television, fax, data communication, and the effective use of a larger portion of the spectrum, the term "wireless" has been resurrected.

Nowadays the term `wireless` is well spread to prove this fact, look the examples of wireless equipment that is used overall:  cellular phones and pagers - provide connectivity for portable and mobile applications, both personal and business, global Positioning System (GPS) - allows drivers of cars and trucks, captains of boats and ships, and pilots of aircraft to ascertain their location anywhere on earth, cordless computer peripherals - the cordless mouse is a common example; keyboards and printers can also be linked to a computer via wireless, home-entertainment-system control boxes - the VCR control and the TV channel control are the most.

The devices on mobile basics : some hi-fi sound systems and FM broadcast receivers, remote garage-door openers, two-way radios - this includes Amateur and Citizens Radio Service, as well as business, marine, and military communications, baby monitors - these devices are simplified radio transmitter/receiver units with limited range, satellite television - allows viewers in almost any location to select from hundreds of channels, wireless LANs or local area networks - provide flexibility and reliability for business computer users.

Wireless technology is rapidly evolving, and is playing an increasing role in the lives of people throughout the world. In addition, ever-larger numbers of people are relying on the technology directly or indirectly. More specialized and exotic examples of wireless communications and control include: Global System for Mobile Communication (GSM) - a digital mobile telephone system used in Europe and other parts of the world; the de facto wireless telephone standard in Europe, General Packet Radio Service (GPRS) - a packet-based wireless communication service that provides continuous connection to the Internet for mobile phone and computer users, Wireless Application Protocol (WAP) - a set of communication protocols to standardize the way that wireless devices, such as cellular telephones and radio transceivers, can be used for Internet access, i-Mode - the world's first "smart phone" for Web browsing, first introduced in Japan; provides color and video over telephone sets.

All wireless can be divided into fixed wireless- devices used in homes and offices and particularly, connected to the Internet via specialized modems; mobile wireless – devices aboard motorized, moving vehicles, for instance the automotive cell phone and PCS (personal communications services)  portable battery-powered wireless devices outside the office, home, or vehicle; examples include handheld cell phones and PCS units; IR wireless - the use of devices that convey data via IR (infrared) radiation, employed in certain limited-range communications and control systems.

Communication devices are getting smaller in size and smarter all the time. As various means of communicating have proliferated, a need to simplify has become obvious. Wireless communication, which requires comparatively few base stations as well as the network of orbiting satellites, and a central facility for switching and controlling calls, can be constructed in months rather than years. Analysts estimate that, by 2013, more than 500 million people around the globe will have subscribed to a wireless service of some kind in this rapidly arriving wireless world.

____________________________________________

Note1: Modulation is еhe variation of a property of an electromagnetic wave or signal, such as its amplitude, frequency, or phase. Modulation can be applied to direct current (mainly by turning it on and off), to alternating current, and to optical signals. Morse code, invented for telegraphy and still used in amateur radio, uses a binary (two-state) digital code similar to the code used by modern computers. For most of radio and telecommunication today, the carrier is alternating current (AC) in a given range of frequencies.

Common modulation methods include: Amplitude modulation (AM), in which the voltage applied to the carrier is varied over time; Frequency modulation (FM), in which the frequency of the carrier waveform is varied in small but meaningful amounts; phase modulation (PM), in which the natural flow of the alternating current waveform is delayed temporarily.

7.7 Answer the questions:

When was the first wireless transmitter invented? What is modulation? Which modulation methods have you known? How many parts can all wireless devices be divided into?

       

7.8 Complete the sentences from the text

Wireless is a term used to___________________. The examples of wireless equipment are_____________. The devices on mobile basics include_______________. Specialized examples of wireless communications and control include:________.

7.9. Agree or disagree with the statements below using the following phrase:

agreement	disagreement
I completely agree with you	I can’t agree with you
I am with you on this point	This is here my point of view differs
That’s it	I completely disagree
I think so	I don’t think so
You are right here	I am afraid you are mistaken
That’s true	You are not right here

Wireless communication is connectivity where info is transmitted without wire by means of electromagnetic waves. The first wireless transmitters went on the air in the early 18th century using radiotelegraphy. With the advent of television, fax, data communication, and the effective use of a larger portion of the spectrum, the term "wireless" has been forgotten. Cellular phones and pagers, GPRS, GSM, satellite television, remote garage-door openers, cordless computer peripherals are included in wireless equipment. i-Mode - is the world’s first “small phone” for web browsing, provides color and video over telephone sets.

7.10 Translate the phrases into English:

Применять акустические волны на частотах выше уровня восприятия человеческого уха, первым беспроводным передатчиком был радиотелеграф, передавать голос и музыку,  термин «беспроводной» возродился, большая часть диапазона, дать возможность подключения для переносных и мобильных приложений, определять свое местонахождение, ,беспроводная мышь, вещать через беспроводное устройство, пульт управления, видео магнитофон, ЧМ(частотная модуляция)-радиовещание, любительская радиослужба и служба персональной радиосвязи, радиопередатчик, ограниченный диапазон, локальная сеть, прямо или косвенно полагаться на беспроводную технологию, цифровой мобильный телефон, автомобильный сотовый телефон, приемопередающая радиостанция, стационарные беспроводные устройства, переносные( мобильные) беспроводные устройства, питаемый от батареи, инфракрасное излучение.

7.11 Translate into English the following definitions:

Модуля?ция (лат. modulatio — размеренность, ритмичность) — процесс изменения одного или нескольких параметров высокочастотного несущего колебания по закону низкочастотного информационного сигнала (сообщения). Амплитудная модуляция - вид модуляции, при которой изменяемым параметром несущего сигнала является его амплитуда. Частотная модуляция - вид модуляции, при котором информационный сигнал управляется частотой несущего колебания. Фазовая модуляция — один из видов модуляции колебаний, при которой фаза несущего колебания управляется информационным сигналом.