1876, 10 In March, the American inventor Bell invented the world's first telephone and obtained the telephone patent approved by the US Patent Office. 1892 telephone line opened in Chicago, new york. Bell, the inventor of the telephone, first auditioned: "Hello, Chicago", and this historic voice was recorded.
Bell has been a professor of language physiology at Boston University since 1873. On one occasion, he tried to send several messages at the same time through a telegraph line. His idea was supported by his wife Mabel and his father-in-law. Mabel is deaf and used to be Bell's student. Her father is very rich and generously provided the necessary financial support for his son-in-law's scientific experiment.
One day, Thomas, Bell's assistant. Watson fiddled with the clamped reed, but Bell heard the plucking sound on the wire in the next room. He wrote down the facts, which led to further experiments. During the experiment, Bell encountered many difficulties. But he is an open-minded and studious person, so when he asked others for advice, he got the guidance and help from some famous scientists, including famous physicists Helmholtz, Joseph, Henry and Edison.
March 1876, March 10, Bell shouted: "Mr. Watson, please come here! I have something to find you! " Watson's assistant in the lab heard the call, jumped out of the lab like crazy and ran to the dormitory where Bell shouted. He shouted all the way: "I heard Bell calling me! I hear Bell calling me! "
In this way, human beings had the initial telephone and opened a brand-new communication history. 1877, the first news telegram sent by telephone was sent to Boston's Le Monde, marking the adoption of the telephone by the public. 1878, Bell Telephone Company was formally established.
The history of telephone development
The telephone was invented by American A.G. Bell in 1876. He used two wires to connect two transmitters and receivers with the same structure and a diaphragm on the electromagnet, which realized the communication between the two ends for the first time. But the call distance is short and the efficiency is low. Carbon microphone appeared in 1878, which greatly improved the efficiency of telephone microphone. The receiver structure has also been improved. The earliest telephone was a magnet telephone, which was powered by its own battery and sent a call signal with a hand-cranked generator.
1880 * * electric telephone appeared, which was powered by * * * electric switch in a centralized way, saving the hand-broadcast generator and dry battery. 189 1 year, rotary dial-up automatic telephone appeared, which can send out DC dial-up pulse, control the action of automatic exchange, select the called user and automatically complete the transfer function. Thus pushing telephone communication to a new stage. By the end of 1960s, push-button all-electronic telephone appeared.
In addition to pulse signaling, DTMF signaling also appeared. With the development of program-controlled switches, the dual-tone telephone is gradually popularized. Electronic telephone circuits are developing towards integration, and telephone application specific integrated circuits have been widely used in various components of telephone circuits. Various multifunctional telephones and special telephones have also emerged.
By the early 1990s, there had been a telephone which integrated the functions of dialing, talking and ringing on an integrated circuit. With the development of speech recognition technology, a new type of telephone that dials directly by voice is also emerging.
The original telephone (terminal) was a magnet telephone composed of a micro-generator and a battery. When making a phone call, the user uses the hand-cranked micro-generator to send an electric signal to call the other party, and the other party connects the phone to form a call loop. Later 1877, T.E. Edison invented the carbon microphone and induction wire, which extended the communication distance. That same year, the telephone was invented. 189 1 year, finally developed into a.b. strowger who invented the automatic telephone.