Briefly describe the historical development of world communication.

Development history of world telecom industry

2004- 1 1-7

From "Zhou Youwang Bonfire Party" to "Bamboo Book", from "Drifting Bottle" to the first telegram in human history-"What a miracle God has created!" In the past hundred years, communication technology has developed rapidly with the help of modern science and technology. Now, let's go back and see the scenery along the way.

Random talk on the history of Chinese and foreign telecommunications

According to the test, people in the Shang and Zhou Dynasties in ancient China knew how to use bonfires to transmit information over a long distance. The most familiar story is "Bomei people laugh, Zhou Youwang people look forward to a bonfire". In the book "One Hundred Years of Telephone" published by the International Telecommunication Union, it is mentioned that in 968 AD, people in China invented something called "Bamboo Letter", which is considered as the embryonic form of today's telephone. Although these stories reflect the wisdom of our ancestors, we still have to understand the development history of modern telecommunications technology from Europe.

Originated in Europe

1793, the Chape brothers in France set up a 230-kilometer-long support line between Paris and Lille to transmit information through relay. This is a communication system consisting of 16 signal towers. The signalman controls the different angles of the bracket through the rope and pulley at the bottom to express the relevant information. At that time, France and Austria were at war, and it took only one hour for the signal system to spread the news of the victory of Kong Di on the Aceh River from the Austrian army to Paris. Later, Belgium, the Netherlands, Italy, Germany and Russia also established this communication system. It is said that one of Chappelle's two brothers was the first person to use the word "telegram".

The study of long-distance sound propagation in Europe began in17th century. Robert, a famous British physicist and chemist? 6? Hook (1) first put forward the proposal of long-distance voice transmission. In 1796, Hughes put forward the method of transmitting voice information through microphone relay, and called this communication method-telephone, which has continued to this day.

1832, American doctor Jackson told the passengers about the principle of electromagnet on a mail ship sailing in the Atlantic Ocean. Among the passengers, American painter Morse, 4 1 year-old, was deeply attracted. At that time, the French signal system could only send miles of information visually. Morse dreamed of transmitting electromagnetic signals with electric current and sending information thousands of miles away in an instant. Since then, Morse's life has undergone fundamental changes.

Morse's inspiration comes from the fact that when the wire is suddenly cut off, the current flowing in the wire will burst into sparks: if the current is cut off as one signal, the current is turned on without sparks as another signal, and the current is turned on for a long time as one signal, these three signals can be combined to represent all letters and numbers, and words can be transmitted far away by current. 1837, Morse finally designed the famous Morse code, which uses different combinations of "dot", "dash" and "interval" to represent letters, numbers, punctuation and symbols. 1844 On May 24th, Morse personally operated the telegraph in the meeting room of the Federal Supreme Court of the Capitol in Washington. With a series of "dot" and "dash" signals, Baltimore, 64 kilometers away, received the world's first telegram composed of "beep" and "tick".

Who invented the telephone?

At present, the recognized inventor of the telephone is Bell, who applied for the telephone patent right in the US Patent Office on February 1876. In fact, just two hours after his application, a man named e? 6? 1 gray people also applied for telephone patents.

Before the two of them, many people in Europe were already doing ideas and research in this field. As early as 1854, the telephone principle was conceived by the Frenchman Bausal, and the idea was repeated by the German Reyes six years later. The principle is that two thin metal sheets are connected by wires. When one side makes a sound, the metal plate vibrates and becomes electricity, and the electricity is transmitted to the other side. But this is just an idea. The problem is the structure of microphone and receiver, and how to convert the mechanical energy of sound into electrical energy and transmit it.

At first, Bell used electromagnetic switch to form on-off pulse signal, but this method is obviously not suitable for such high-frequency sound waves. The final success came from an accidental discovery. 1875 On June 2nd, in an experiment, he connected a metal plate with an electromagnetic switch. Unexpectedly, in this state, the sound becomes a wonderful current. According to the analysis principle, it turns out that the metal sheet vibrates due to sound, and current is induced in the connected electromagnetic switch coil. Now it seems that this principle is known to a student who has studied physics in junior high school, but it is undoubtedly a very important discovery for Bell at that time.

Gray's design principle is different from Bell's, which uses the resistance change of the liquid inside the microphone, while the receiver is exactly the same as Bell's. 1877, Edison obtained the invention patent of carbon particle microphone. At the same time, many people have made various improvements to the way the telephone works. The patent dispute is very complicated, and it didn't come to an end until 1892. One of the reasons for this situation is that the largest Western Union telegraph company in the United States bought the patents of Gray and Edison at that time and confronted Bell's telephone company. Due to the long-term patent dispute, the two sides reached an agreement. Western Union Telegraph Company fully recognized Bell's patent right and never set foot in the telephone industry again, in exchange for sharing 20% of Bell's income within 17.

technological development

In the decades after the invention of the telephone, a large number of patents were applied for the operation and technology of the telephone. Strowger's "automatic dialing system" reduces the problems caused by manual wiring, the application of dry battery reduces the size of the phone, and the application of loading coil reduces the signal loss of long-distance transmission. 1906, Li De invented the electronic test tube, and its amplification function led the direction of telephone service. Later, Bell Telephone Laboratory made an electronic triode based on this, and this research is of great significance. 1On October 25th, the first cross-regional telephone line was opened between new york and San Francisco. It uses 2500 tons of copper wire, 654.38+300,000 telephone poles and numerous load coils, and uses three vacuum tube amplifiers along the way to strengthen the signal. On July 1948, scientists at Bell Laboratories invented the transistor. This is not only of great significance to the development of telephone, but also has great influence on all aspects of human life. In the following decades, a large number of new technologies appeared, such as the production of integrated circuits and the application of optical fibers, which played a very important role in the development of communication systems.

The mobile phone is in China.

After the Opium War, while the western powers plundered land and wealth in China, they also brought modern postal services and telecommunications to China. 1900, the first local telephone in China came out in Nanjing; From 1904 to 1905, Russia established a radio station from Yantai to Niuzhuang. The ancient postal system and non-governmental communication institutions in China have been gradually replaced by advanced postal services and telecommunications.

During the Republic of China, China's post and telecommunications industry was still under the control of western powers. Coupled with years of war, communication facilities are often destroyed. During the War of Resistance against Japanese Aggression period, the Japanese imperialists reformed and expanded the telecommunication network system for the need of war and the purpose of trying to rule China for a long time. They took advantage of China's backward economy and technology and the corruption of the political system at that time to control the telecommunications industry in China from the aspects of technology, equipment, maintenance and management.

Before 1949, the telecommunication system in China developed slowly. By 1949, the telephone penetration rate in China was only 0.05%, and there were only 260,000 telephone users.

After 1949, the central people's government quickly resumed and developed communications. The Beijing Telegraph Building completed in 1958 has become an important milestone in the history of new China communication development. Ten years of "cultural revolution", the post and telecommunications industry suffered another blow, and its business development stagnated. As of 1978, the national telephone penetration rate is only 0.38%, which is lower than the world level of110. China has a population of 1/5, and the total number of telephones is less than 1% of the total number of telephones in the world, with less than one telephone for every 200 people, 75 years behind the United States! The automation rate of switches is low, most counties and rural areas still use "crank", and long-distance transmission mainly depends on open wire and analog microwave. Even in Beijing, 20% of long-distance calls can't be connected every day, and 15% of long-distance calls can't be connected until 1 hour. Visitors to the telegraph building must queue up with lunch.

1978 The national telephone capacity was 3.59 million, with 2140,000 users, with a penetration rate of 0.43%.

After the reform and opening up, the backward communication network has become the bottleneck of economic development. Since the mid-1980s, the government of China has accelerated the construction of basic telecommunications facilities. By March 2003, the number of fixed telephone users had reached 2,256.26 billion, and the number of mobile telephone users had reached 2,265.438+4.98+0 billion.

At all times, many people are trying to transmit information faster and better. In the 100 years of telecommunication development, people have tried various communication methods: the original telegraph used a similar "digital" expression to convey information; So there appeared a telephone that used analog signals to transmit information; With the development of technology, the digital mode has attracted attention again with its obvious advantages. The historical wheels of digital program-controlled switching, digital mobile phone and optical fiber digital transmission are still advancing.

A telephone from a hundred years ago.

Since the invention of the telephone, great changes have taken place from the working principle to the shape design. Please follow us for a century of telephone development. These telephones are the collections of antique telephone collectors all over the world.

1878, handheld phone

This telephone was made by Werner Siemens of Germany in 1988. Its receiver and microphone are the same, and they are used alternately when listening and speaking.

1879, boxed mobile phone

This mobile phone is equipped with a mahogany magneto made by Viaduct Manufacturing Company and a cylindrical receiver.

1880, Bell Telephone

This is the first telephone used in Europe. It replaces the telegraph and is more advanced than the magnetic engine telephone with handle.

188 1, 1882, wall-mounted telephone with magnetic generator.

The telephone on the left is American Bell model, produced in 188 1, and used by Copenhagen Bell International Telephone Company. Made by Ericsson. This mobile phone was very popular at the end of last century.

1885, "Eiffel Tower" magnetic generator telephone

This mobile phone was produced by L.M. Ericsson in 1885. At that time, it was the first telephone on the desktop. The microphone is installed on the rotating arm, and the crank is used to connect the switch.

1885, 1902, wall-mounted telephone with magnetic generator.

The telephone made by Ferdinand E. Statham in Copenhagen on 1885 was the earliest telephone made by Danes. This model is made by Emile Modes telephone company in Hawthorne.

1885, wooden stand desk phone

The manufacturer and place of origin are unknown.

1892 electric folding counter mobile phone

This kind of telephone is mostly used in homes, hotels and telephone booths.

1892, "Eiffel Tower" telephone with handset

This is a real classic telephone, 1892, made by Ericsson. This mobile phone has spread all over the world, and nearly1100,000 units have been produced.

1893, "coffee pot" phone

This mobile phone has only a few samples in Denmark, which is the most attractive and valuable for collectors. 1899, digital mechanical wall phone

There are two kinds of digital mechanical phones: wall-mounted and desktop.

1900, vertical desk phone

This round-bellied desk phone is plated with bronze nickel. There is a strong bakelite under the hanging rod. It also has a peripheral mobile phone to show off.

1900, Vertical Cone Desk Phone

This mobile phone has a nickname "oil pot" because of its shape.

1900, 20-line separated telephone

This section is the so-called 20-line separated telephone. It can only be used for internal calls made by L.M. Ericsson in Sweden.

190 1 year, desk phone with magnetic generator.

This model was manufactured by Ferdinand E Stensens Telecom Co., Ltd. in Copenhagen on 190 1. Pay attention to its receiver and hang it on the hook alone. It may be because the quality of telephone access at that time was not high, and sometimes it was necessary to listen with two ears.

1902, Kellogg's desk phone

This kind of corner desk phone is mostly used in homes, offices and telephone booths. It is made by American hardwood telephone company. I bought it from farmers in a small town in California.

1902, public battery wall telephone

This kind of phone doesn't need to turn the handle, so it can pick up the receiver and talk directly to the operator. It was bought from an antique shop in San Francisco.

1904, magneto collinear telephone

This telephone is produced by L.M.Ericssom company, and the telephone number is 1904. This mobile phone can be shared by four users. 1753, 17 In February, a magazine named The Scotsman first put forward the idea of current communication, and the article was signed by C.M.

1784 August 15, a visual communication method called "Yuanwang" was first used between Lille and Paris.

1796, an Englishman named Hughes proposed a method of transmitting sound through microphone relay, and named it telephone, which has been in use ever since.

1832, Russian diplomat Schilling made a telegram that used galvanometer pointer to deflect the received information.

1835, American Morse invented the telegraph that uses electromagnetic principle to transmit telegrams.

1in June, 837, an Englishman, Cook, obtained the first patent for the invention of telegraph, and his telegraph machine was used on the railway for the first time.

From 1837 to 1838, Morse invented Morse code to encode numbers and letters by "turning on" and "turning off" current.

1843, Morse built a telegraph line from Washington to Baltimore, with a total length of 64.4 kilometers.

1844 On May 24th, Morse sent the first telegram in human history to Baltimore at the Capitol: "What a miracle God has created!" .

1850 On August 28th, John and Jacob built the first submarine cable. 6? 1 Brett brothers laid it on the high seas between Cape Grice-Ness in France and Cape Richland in England, but it was interrupted only after sending a few telegrams. It turned out that a fisherman hooked a cable with a trawl and cut off a section to brag about this rare "seaweed" specimen, and was surprised to say that it was full of gold.

On April, an Englishman named Bell invented the telephone. "Mr Watson, come and help me" became the first voice on the phone. At that time, Bell spilled acid from the microphone on his leg.

1879, a telegraph line was established between Tianjin and Dagu Beitangbao.

1882 February 2 1 day, Gaodan Gaobei Telegraph Company set up a telephone exchange on the Bund in Shanghai.

1895, Russian popov and Italian Marconi invented the wireless telegraph respectively.

On May 6th, 2008, Marconi successfully realized radio communication in Bristol Strait.

1900 Shanghai Nanjing telegraph office opened the local telephone, and there were only 16 telephones at that time.

190 1 year, Marconi realized radio communication across the Atlantic.

In 1903, the wireless phone test was successful.

1907165438+1October 8, French inventor Edward? 6? 1 Belan shows his research results in the building of the French Photographic Association-photo fax.

19 19, Pahlm and Behlander invented the "crossbar connector". Ten years later, the world's first large-scale vertical and horizontal telephone exchange was built in Sonzwar, Sweden.

Chunghwa Post Company started postal telegraph service in July.

In 1937, Englishman Reeves proposed a method of transmitting voice information by all combinations of pulses (pulse code modulation).

1945 10 month, English A? 6? 1C？ 6? 1 Clark put forward the idea of geostationary satellite communication.

1946, eckert and mochiri built the world's first electronic computer.

In 1947, Bell Laboratories put forward the concept of cellular communication, which divides the service area of mobile phones into several cells, and each cell is equipped with a base station to form a cellular mobile communication system.

1950 65438+February, the international trunk line project of China Northeast Long-distance Open Line was completed, and the cable carrier circuit from Beijing to Moscow was opened.

1In July, 954, the US Navy made use of the reflection of radio waves on the surface of the moon to conduct a telephone transmission test between the two places on the earth. 1956, communication service was established between Washington and Hawaii.

1956, a telephone cable was laid under the Atlantic Ocean between Britain and Canada, making long-distance telephone communication between the mainland a reality.

1957, 1 01On October 4th, the former Soviet Union successfully launched the first man-made satellite "1".

In August, 1958, the first domestic 12 carrier telephone equipment was successfully developed in Shanghai post and telecommunications equipment factory.

1960 65438+ 10, the first set of 65438+ ten thousand-door automatic telephone exchange in China was put into use in Shanghai Wusong telephone office.

1960, American physicist Mayman irradiated artificial gem with powerful ordinary light, and produced a laser with a light intensity of 0.00000 times that of the sun/kloc-0.

1962, the United States successfully developed a pulse code modulation device for telephone multi-channel communication.

1965, the first program-controlled telephone exchange controlled by computer came out in America, marking the beginning of a new telephone era.

1966, Gao Kun, a British Chinese, put forward the idea of long-distance laser communication with glass fiber.

1969, Beijing Long-distance Telecommunication Bureau successfully installed the first fully automatic long-distance telephone equipment in China.

1969, the Advanced Research Projects Agency (ARPA) of the US Department of Defense put forward a plan to develop ARPA network, which was completed and put into use in 1969, marking the development of computer communication has entered a brand-new era.

1970, the world's first program-controlled private branch exchange was opened in Paris, marking the full application of digital telephone and the arrival of a new era of digital communication.

In 1972, CCITT first proposed the concept of ISDN.

1974, the Sino-Japanese submarine cable started construction, which was the first international submarine cable that China participated in.

1975, the crossbar automatic telephone exchange equipment developed and designed by our country passed the national appraisal and began mass production.

1976 in March, China's first large-capacity transmission system-1800 coaxial cable carrier system was completed and put into operation in Beijing, Shanghai and Hangzhou, with a total length of1700km.

1982, GSM was established in Europe, with the task of formulating roaming standards for pan-European mobile communication.

1982, the first batch of coin-operated public telephones in China appeared in busy streets such as East and West Chang 'an Avenue, with a total of 22 coin-operated public telephone booths.

1982 65438+February, the first domestic ten thousand-door program-controlled local telephone exchange system imported from Japan was put into use in Fuzhou Telecommunications Bureau, and the first imported program-controlled telephone office was built in China.

1983, AMPS cellular system was opened in Chicago, USA.

1904, "spider" civil band telephone

Ericsson's first civil band phone. 1905, tree desk phone in Chicago

This desktop mobile phone is called "paunchy", named after the bulge in the middle of its handle.

1905, porch intercom

This is the 32-door porch intercom of Connecticut Telecom.

1905, 1 1 digital dial desk phone

It uses the number 1 1 to dial.

1907, "German mode" radio band telephone

1907 in Germany by e.zwuetzch &; Co manufacturing, the emergence of this mobile phone can solve the problem of long call waiting time to a certain extent.

1907, magneto telephone

This telephone 1907 is made by Ericsson. It is worth noting that when answering the phone, the receiver should be hung on a separate hook. This was the unified standard of telephone manufacturers at that time.

1908 CH-08 hands-free phone

Introduced by KTAS.

19 10 year, VoIP.

This is a vertical desk phone made by S.H. Couch Company, which is used for communication between offices.

19 12, office scheduling machine

This mobile phone can have 17 extensions at the same time through the host, each extension can be dialed out, and the extensions can also be connected to each other.

19 12, CH-08 wall phone

This telephone was made in 19 12. It was made by Danes in Copenhagen and can automatically send and receive telegrams.

19 12, phone number of magnetic generator.

Telegrams and fax telephones produced by Ericsson are usually used in remote areas or small islands.

19 14, Magnavox anti-noise desk phone

The unique design of this mobile phone is that when talking into the microphone, the sound vibrates the vibrating plate in the mobile phone through the small hole on the top of the mobile phone. Noise will be eliminated when it enters the microphone. Its dual rotating headphones help prevent useless noise.

19 14, Magnavox anti-noise desk phone B 1.

It also has the function of eliminating noise.

19 14, phone number of magnetic generator.

It was made in hovens on 19 14 and can be used for telegrams and faxes.

19 15, Veau desk phone

The information is unknown.

19 15, self-made wall phone.

This mobile phone was found in an abandoned farm in East Oregon. There are nearly 20 abandoned farms in the local area, with traces of telephones hanging on the walls.

1920, wall-mounted telephone of magneto.

This mobile phone was made in 1904 and updated in 1920. It is equipped with a rotating red button that can receive and listen.

1927, D-08 semi-automatic telephone

The first dial-up telephone, its appearance will replace the manual call system of the switch. The dialing device was installed in 1927 and actually used in 1978.

1927, ringing telephone for AC power generation

It was made by Christian Kirks Telecom Manufacturing Company in Hohense, Denmark, and is still in use in 1970s.

1929, automatic wall phone

The information is unknown.

1930, D-30 semi-automatic gold-plated telephone

This mobile phone was produced by a Danish company in 1930, and its special feature is that its surface is gold-plated. At that time, most telephones were dark, and this telephone had a dialing device.

1930, FL-30 automatic telephone

It was made in Denmark in the 1930s, and it can dial letters. Similar mobile phones have been used for about 48 years.

1935 automatic telephone

This kind of telephone is used to communicate with telecommunication exchanges in remote areas, and its design was influenced by the American telephone industry in the 1930s.

1943, CB-43 telephone

This phone, which is made by Danish telecom company Christine Kirks, has two kinds of ringtones designed internally to distinguish incoming calls inside and outside the city.

195 1 year, F-5 1 automatic dial-up telephone.

This telephone was made by Christian Kirks Telecom after World War II.

1952, F-52 automatic dialing telephone

1952, which is different from the previous black bakelite material. It is made of ivory and later plastic materials.

1956, "Ericofon" automatic dialing telephone.

This mobile phone is designed and manufactured by L.M. Ericsson of Sweden and named Ericofon. It is made of new materials and is much lighter than the traditional telephone receiver.

1968, F-68 automatic dialing telephone

This telephone was the most common telephone in the 1970s. It was originally designed in the 1960s and widely manufactured in Denmark.

1970, F-68 button dial phone

The first touch-tone telephone used in Denmark, which uses numeric keys instead of the original dialing method.

1976, 76E/DK80 button dial phone

Originally manufactured by Jutland Telephone Company, the telephone number is 1972.

1979, F-79 push-button dial toll phone

This telephone is between the ordinary telephone and the public telephone. It is mainly used in service places, hotels and other similar places to prevent theft and make phone calls. 1980, DA-80 push-button dial phone

The design of this phone marks that the electronics theory has really entered the telephone industry.

1982, portable telegraph telephone

This phone is made by Ericsson Wireless Systems. At that time, it could only be used in Denmark, Finland, Norway and Sweden. Its appearance has opened up a new world for the future GSM mobile phone system.

1983, Danish 2-key mobile phone

DanMark2 is produced in 1983, which is the embodiment of the most advanced technology in 1980s. It has many functions, such as telephone number storage function, redial function, monitoring function and 24 kinds of ringtones.