Прочитайте текст и определите какой из заголовков соответствует тексту. A channel is a division in a...: ответ на тест 933118 - Английский язык

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A channel is a division in a transmission medium so that it can be used to send multiple streams of information. For example, a radio station may broadcast at 96.1 MHz while another radio station may broadcast at 94.5 MHz. In this case, the medium has been divided by frequency and each channel has received a separate frequency to broadcast on. Alternatively, one could allocate each channel a recurring segment of time over which to broadcast – this is known as time-division multiplexing and is sometimes used in digital communication.

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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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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.