Where is the development of communication technology? 20

Humans have a long history of communication.

As early as ancient times, people exchanged information through simple language, murals, etc.

For thousands of years, people have been using language, symbols, bells and drums, fireworks, bamboo slips, paper books, etc. to convey information.

There are still some primitive tribes in some countries that still retain ancient methods of communication, such as drumming and trumpeting.

In modern society, the command sign language of traffic police, the flag language in navigation, etc., are just the result of the further development of ancient means of communication.

The basic aspects of this information transmission are based on human sight and hearing.

After the middle of the 19th century, with the issuance of telegraphs and the discovery of electromagnetic waves, the field of human communication has undergone a fundamental and tremendous change, realizing the use of metal wires to transmit information, and even wireless communication through electromagnetic waves, making the mythical "Shunfeng Ear" and "Clairvoyant" become a reality.

Since then, human information transmission can be separated from the conventional audio-visual mode, and the electric signal can be used as a new carrier, which has brought a series of iron technology innovations and started a new era of human communication.

In 1837, the American Samuel. Samuel Morse succeeded in developing the world's first telegraph with electricity and stool.

Using the code he designed, he could convert information into a series of long or short electrical pulses that were transmitted to the destination, and then converted into the original information.

On May 24, 1844, Morles conducted the first telegram in human history "in Morse code" in the Capitol chamber, enabling long-distance telegraph communication.

In 1864, the British physicist Maxwell (established a set of electromagnetic rationality theory, predicted the existence of electromagnetic waves, and explained that electromagnetic waves have the same properties as light, and both travel at the speed of light.

In 1875, the Scottish youth Alexander. Bell invented the world's first ** machine.

And in 1876 he applied for a patent for invention.

In 1878, the first long-distance experiment between Boston and New York, 300 kilometers apart, was carried out and succeeded, and the famous Bell Company was founded.

In 1888, the German youth called the physicist Heinris. Hertz (who conducted a series of experiments with radio rings and discovered the existence of electromagnetic waves, he used experiments to prove Maxwell's electromagnetic theory.

This experiment caused a sensation in the entire scientific community and became an important milestone in the history of modern science and technology, leading to the birth of radio and the development of electronic technology.