One, the original communication
The Shang Dynasty before the writing has not appeared, so the communication almost all rely on roar. Around the Spring and Autumn and Warring States periods, writing became more mature, flying pigeons to send letters, stagecoaches, beacons ...... were the most popular methods at that time.
Compared to now although it is very simple, but at that time this is a big progress Although the ages are far apart, but the West until a few thousand years after the invention of the post this way.
Two, power communication
Power, as the name implies, is to use a whole lot of instruments that work with electricity.
The advent of the invention of electricity brought a new era in the history of human communication.
After the middle of the 19th century, with the telegraph, the telephone, the discovery of electromagnetic waves, the field of human communication has produced a fundamental change in the realization of the use of metal wires to transmit information, and even through the electromagnetic wave to wireless communication. In 1837, the American Samuel Morris (Samuel Morris) discovered the electromagnetic wave. Samuel Morse (Samuel Morse) successfully developed the world's first electromagnetic telegraph. He used his own design of electric code, can be converted into a string of information or long or short electric pulse transmission to the destination, and then converted to the original message In 1875, the Scottish youth Alexander Bell (A.G. Bell). In 1875, the Scottish young man Alexander Bell (A.G. Bell) invented the world's first telephone. And in 1876 applied for a patent for the invention. 1878 in the 300 kilometers apart between Boston and New York conducted the first long-distance telephone experiments, and succeeded
1888, the young German physicist Heinrich Hertz (H.R. Hertz). H.R. Hertz (H.R. Hertz) with the electric wave ring conducted a series of experiments, discovered the existence of electromagnetic waves, he proved Maxwell's theory of electromagnetism with experiments. This experiment stirred up the entire scientific community, becoming an important milestone in the history of modern science and technology, leading to the birth of radio and the development of electronic technology. In 1904, the British electrical engineer Fleming invented the diode. In 1906, the American physicist Fessenden successfully researched radio broadcasting.
In 1907, the American physicist DeForest invented the vacuum triode, the American electrical engineer Armstrong application of electronic devices invented the super-aberrant receiver. 1920 American radio expert Conrad in Pittsburgh to establish the world's first commercial radio broadcasting station, since then the broadcasting business in the world flourished, the radio has become a convenient way to understand the current news. 1924, the American radio expert Konrad in Pittsburgh established the first commercial radio broadcasting station, since then the broadcasting business in the world flourished, radio became people understand current news. In 1924, the first short-wave communication line was established between Nauen and Buenos Aires, and in 1933, the Frenchman Clavell established the first commercial microwave radio line between Britain and France, which promoted the further development of radio technology. The discovery of magnetic waves also prompted the rapid development of image dissemination technology. 1922 16-year-old American high school student Philo. In 1922, Philo Farnsworth, a 16-year-old American high school student, designed the first television facsimile schematic diagram, and applied for a patent in 1929, and was ruled to be the first person to invent the television set.
In 1928, Zwolgin of Westinghouse invented the photovoltaic tube and, in collaboration with engineer Van Wasser, realized the electronic scanning method of sending and transmitting television. Image fax is also an important communication. Since 1925, the United States radio company developed the first practical fax machine, fax technology continues to innovate. 1972 years ago, the technology is mainly used for news, publishing, meteorology and broadcasting industry; 1972 to 1980, fax technology has been completed from the analog to digital, from the mechanical scanning to the electronic scanning, from the low-speed to high-speed transformation, in addition to replacing the telegraph and for the transmission of meteorological maps, Press releases, photographs, satellite cloud charts, but also in the medical, library management, intelligence consulting, financial data, e-postal and other aspects of the application of 1946, the University of Pennsylvania of the United States, Eckert and Moshiri developed the world's first electronic computer
In order to solve the problem of resource **** enjoyment of a single computer is quickly developed into a computer network to achieve the data communication between computers, data **** enjoyment. The data communication between computers was realized, and the data **** enjoyment. Communication media from ordinary wire, coaxial cable development to twisted pair, fiber optic wires, fiber optic cables; electronic computer input and output devices have also developed rapidly, scanners, plotters, audio and video equipment, so that the computer as a tiger to add wings to deal with more complex issues. The rise of multimedia technology at the end of the 1980s, so that computers have a comprehensive treatment of text, sound, image, film and television, and other various The rise of multimedia technology in the late 1980s, so that the computer has the ability to comprehensively process text, sound, images, video and other forms of information, increasingly becoming the most important and indispensable tool for information processing.
Wired communications
U.S. Morse (F.B. Morse): about 5km telegraph (point, scratch, space → letters, numbers);
U.S. Bell (A.G. Bell): the patent for the telephone (electrical signals → voice);
U.S. Purposeful: communication cables;
1972, Japan: public ** * * * communication network of data communications, * * communication network of communication, * * communication networks, * data communications, * communication networks, * * communication network of data communications, * * communication networks of data communication, * communication networks of data communications, * communication networks of data communications, * communication networks of data communications, * communication networks of data communications, * communication networks of data communications, * communication networks of information and information, and * * communications network of information, and information, and information, and information, and information, and information, and information, and information, and information, and communication.
1972 Japan: Public *** communication network for data communication, fax communication service;
United States: publication of the Bell Data Network, United Kingdom: experiments with image information services;
Modern communication systems utilize certain centralized switching facilities → complex information networks
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→ "switching function" → realization of transmission of signals between two points at any one time.
Wireless communication
1864 Maxwell, England: the existence of electromagnetic waves was envisaged; 1888 Hertz, Germany: the existence of electromagnetic waves was confirmed;
1895 Marconi, Italy: wireless communication with a distance of only a few hundred meters;
1901 Marconi, Italy: transatlantic wireless communication;
1928 Marconi, Italy: wireless communication;
1929 Marconi: wireless communication;
1928 Marconi: wireless communication;
1929 Marconi: wireless communication;
1928 Marconi: wireless communication. p>
Founded in 1928, Motorola was contracted by the U.S. Department of the Army to assist in the development of wireless communications tools for World War II, and in 1941, Motorola developed the first of a long line of products, the SCR-300, which remains the classic image of the U.S. Army Corps of Engineers in the movies.
1938 Ribbons, France: PCM;
1940 CBS, USA: Color TV experimental broadcast; 1951 CBS, USA: Color TV official broadcast
Until 1984, the first generation of mobile phone, "Big Brother", was invented by the famous American inventor, Martin Lawrence Cooper. Until 1984 by the famous American inventor Martin Lawrence Cooper invented the first generation of cell phones, "big brother" into the consumer market, human communication has since begun to enter the wireless mobile era, a little bit of the shadow of the cell phone, but also with the global interconnection of the excess of the smart mobile era.
The earliest "cell phone" is as early as 26 years ago in 1992, IBM released the world's first smartphone Simon Personal Communicator, which is the first time the use of a full-touch screen smartphone, laying the road to the development of modern smartphones. A photo with his 15-year-old iPhone:
......
Modern: Wireless communications are global and cosmic, such as GPS, which is accurate to within tens of meters.
Future
? Maybe in the future we will have chips inserted in our brains, each chip will be automatically saved through contact, so as to avoid some nuisance calls, who they want to call will automatically call, everything seems to be automatic, do not need to carry a cell phone every day.
Personal communications (Personal communications) is the highest goal of human communication, it is with a variety of possible network technology. Users can communicate with anyone at any time, anywhere a new way of communication.
①Using a unique personal communication number (PTN) independent of the network to identify the user. Users can establish connections and billing with each other across multiple networks regardless of geographic area. PTNs are common to both wired and wireless systems.
② The network that provides personal communications is a seamless network of great capacity, integrated by multiple networks (including land, sea, and space networks) using a variety of technical means. As a result, users can find each other or be found by each other no matter where they are.
③ Fixed or mobile users can enter the network anywhere with wired or wireless means to obtain communication services.
④ There is the ability to provide a variety of services, the network can provide a variety of services in accordance with the wishes and requirements of individual users.
⑤ Mobile terminals are ultra-compact, easy to carry ^ low energy consumption, can be used for several weeks after charging.
This is the so-called ultimate goal of human communication.
-The End -
Written by Lv Wenhao Wu Yujie
Photo: Web