Who invented the telephone?

The telephone was invented by Alexander Graham Bell, an Englishman. Bell was born into an acoustic family in England and later moved to America. In Boston, a school has increased the number of deaf teachers. For professional reasons, he studied the physiological functions of listening and speaking. Later, he was hired as a professor of sound physiology at Boston University. 1873 resigned as a professor and began to concentrate on the research and development of telephones. To develop the telephone, we must first turn the sound signal into an electrical signal, and then turn the electrical signal into a sound signal. Before Bell, many people had been studying this problem. 1875, Bell was inspired by the application of electromagnets in telegraphy, which can convert electrical signals and mechanical movements. Bell began to design electromagnetic telephones. He first put a tuning fork in front of a coil with an iron core. The vibration of the tuning fork causes the iron core to move correspondingly, resulting in induced current. The current signal is transmitted to the other end of the wire and converted into a sound signal. Later, Bell changed the tuning fork into a metal piece that can vibrate with the sound, and changed the iron core into a magnetic rod. After repeated experiments, a practical telephone device was made. 1876, Bell obtained the telephone patent in the United States. He not only invented the telephone, but also established the first telephone company in the world. 1885, two telephone inventors, Alexander Graham Bell and Thomas A. Watson, made long-distance communication a reality, and Theodore N. Will, the inventor of Bell System, made universal telephone service a reality. 1885, Mr. Bell founded AT & amp； t .at & amp； T) is an American telecommunications company, founded in 1877, which once monopolized the American long-distance and local telephone market for a long time. At&T Company. Bell Laboratories is a leading scientific research institution in the world. It not only engages in extensive basic research, but also devotes itself to developing cutting-edge technologies and popular products. T's business team designs and develops new processes, systems and businesses. From 1925, at & amp； T Bell Laboratories receives an American patent every day on average, and seven sciences have won the Nobel Prize in Physics. 1895, Bell Company split the long-distance service project it was developing nationwide in the United States and established an independent company named AT & amp； T. at&t. T Bell Laboratories is the first research institution to win the national technical medal, which is the highest honor awarded by the American government. Electronic digital computer (1937), transistor (1947), laser (1958), communication satellite (1962), optical fiber manufacturing technology (1974), optical switch device (. Bell labs. Bell Laboratories will carry out breakthrough research in the fields of microelectronics, optoelectronics and software. Among the more than 25,000 employees in Bell Laboratories, 3,500 have doctorates and thousands have master's degrees. The research funding of 1993 reaches 3 billion dollars. Make at&T continue to maintain the leading position in world communication.