Помогите Пожалуйсто, составить сочинение по английски про какое - нибудь изобретение , допустим телефон?

Innaghf 15 июн. 2021 г., 12:37:33

Atelephone, orphone, is atelecommunicationsdevice that permits two or more users to conduct a conversation when they are too far apart to be heard directly.

A telephone convertssound, typically and most efficiently thehuman voice, into electronic signals suitable fortransmissionvia cables or other transmission media over long distances, and replays such signals simultaneously in audible form to its user.

In 1876, Scottish emigrantAlexander Graham Bellwas the first to be granted a United States patent for a device that produced clearly intelligible replication of the human voice.

This instrument was further developed by many others.

The telephone was the first device in history that enabled people to talk directly with each other across large distances.

Telephones rapidly became indispensable to businesses, government, and households, and are today some of the most widely usedsmall appliances.

The essential elements of a telephone are amicrophone(transmitter) to speak into and anearphone(receiver) which reproduces the voice in a distant location.

In addition, most telephones contain aringerwhich produces asoundto announce an incoming telephone call, and a dial or keypad used to enter atelephone numberwhen initiating a call to another telephone.

Until approximately the 1970s most telephones used arotary dial, which was superseded by the modernDTMFpush - button dial, first introduced to the public byAT&Tin 1963.

The receiver and transmitter are usually built into ahandsetwhich is held up to the ear and mouth during conversation.

The dial may be located either on the handset, or on a base unit to which the handset is connected.

The transmitter converts thesound wavestoelectrical signalswhich are sent through the telephone network to the receiving phone.

The receiving telephone converts the signals into audible sound in the receiver, or sometimes aloudspeaker.

Telephones permitduplex communication, meaning they allow the people on both ends to talk simultaneously.

The first telephones were directly connected to each other from one customer's office or residence to another customer's location.

Being impractical beyond just a few customers, these systems were quickly replaced by manually operated centrally located switchboards.

This gave rise tolandlinetelephone service in which each telephone is connected by a pair of dedicated wires to a local central office switching system, which developed into fully automated systems starting in the early 1900s.

For greater mobility, various radio systems were developed for transmission between mobile stations on ships and automobiles in the middle 20th century.

Hand - heldmobile phoneswere introduced for personal service starting in 1973.

By the late 1970s several mobile telephone networks operated around the world.

In 1983, theAdvanced Mobile Phone System(AMPS) was launched, offering a standardized technology providing portability for users far beyond the personal residence or office.

These analog cellular system evolved into digital networks with better security, greater capacity, better regional coverage, and lower cost.

Thepublic switched telephone network, with its hierarchical system of manyswitching centers, interconnects telephones around the world for communication with each other.

With the standardized international numbering system, E.

164, each telephone line has an identifyingtelephone number, that may be called from any authorized telephone on the network.

Although originally designed for simple voice communications, convergencehas enabled most modern cell phones to have many additional capabilities.

They may be able torecord spoken messages, send and receivetext messages, take and display photographsorvideo, play music orgames, surf the Internet, doroad navigationor immerse the user invirtual reality.

Since 1999, the trend for mobile phones issmartphonesthat integrate all mobile communication and computing needs.

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Вас попросили подготовить реферат о важнейших изобретениях 20 века.

Расскажите своим товарищам : - какое изобретение Вы считаете самым главным ; - какими устройствами Вы часто пользуетесь и для чего ; - почему людям трудно обойтись без компьютеров и мобильных телефонов.

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