Вопрос № 933118 - Английский язык

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A telecommunication system consists of three basic elements:
– a transmitter that takes information and converts it to a signal;
– a transmission medium that carries the signal; and,
– a receiver that receives the signal and converts it back into usable information.
For example, in a radio broadcast the broadcast tower is the transmitter, free space is the transmission medium and the radio is the receiver. Often telecommunication systems are two-way with a single device acting as both a transmitter and receiver or transceiver. For example, a mobile phone is a transceiver.
Telecommunication over a phone line is called point-to-point communication because it is between one transmitter and one receiver. Telecommunication through radio broadcasts is called broadcast communication because it is between one powerful transmitter and numerous receivers.

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In a broadcast system, a central high-powered broadcast tower transmits a high-frequency electromagnetic wave to numerous low-powered receivers. The high-frequency wave sent by the tower is modulated with a signal containing visual or audio information. The antenna of the receiver is then tuned so as to pick up the high-frequency wave and a demodulator is used to retrieve the signal containing the visual or audio information. The broadcast signal can be either analogue (signal is varied continuously with respect to the information) or digital (information is encoded as a set of discrete values).

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Mobile phones have had a significant impact on 1_______ networks. Mobile phone subscriptions now outnumber fixed-line subscriptions in many markets. Sales of mobile 2_______ in 2005 totalled 816.6 million with that figure being almost equally shared amongst the markets of Asia/Pacific (204 m), Western Europe (164 m), CEMEA (Central Europe, the Middle East and Africa) (153.5 m), North America (148 m) and Latin America (102 m). Increasingly these phones 3_______ by systems where the voice content is transmitted digitally such as GSM or W-CDMA choosing to depreciate analogue 4_______ such as AMPS.

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This new super-cool 1_______ Brightman QT1 gives you the best in mobile 2_______:
– multimedia messaging to send snapshots to your friends
– 3_______ games, graphics and music
– infrared signal transmission to your computer (no cables!)
– voice-activated 4_______ – just speak to call
– programmable ring tones so you know who is calling before you answer
– detachable faceplate so you can change it to match your clothes
– antenna for clearer reception.

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The SP5 Deluxe is everything you need in 1_______ technology!
– multimedia messaging with pictures and 2_______
– make calls while browsing the Web
– digital and analog band modes for town and country
– voicemail 3_______ messages to your office
– large 4_______ with 6 text lines for text messages
– large key pad and scroll keys for easy navigation
– Personal Information Manager (PIM) for your appointment schedule
– wireless connection to your PC.

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According to research, the majority of 18 to 24 year olds (88%) currently have a mobile phone for 1_______ use. In a recent survey of their views, 32% said they can’t live without their 2_______ phone. One in three (33%) said a mobile is 3_______, but not essential and 28% said it’s nice to have a mobile, but they could 4_______ without it. Only 7% said it doesn’t matter whether they have one or not.