1,The working principle of the microphone is: when the person speaks to the microphone, the sound wave vibrates the diaphragm, the diaphragm squeezes the carbon particle suddenly and tightly, the resistance changes accordingly, and the current that changes with the vibration of the sound is generated in the circuit, that is, the microphone is equivalent to variable resistance.
2, the working principle of the phone microphone: vibration causes diaphragm vibration → carbon density change → (microphone resistance change) → current (size) change; The working principle of the telephone handset: signal → electromagnetic wave (change) → change of the gravitational force on the diaphragm → diaphragm (vibration) → emit sound.
3, the working principle of the microphone is: when the person is facing the sourceWhen the microphone speaks, the sound wave makes the diaphragm vibrate, the diaphragm squeezes the carbon particle suddenly and tightly, the resistance changes accordingly, and the current that changes with the sound vibration is generated in the circuit, that is, the microphone is equivalent to variable resistance.
2, the telephone is a two-way transmission of voice equipment through electrical signals. As early as the eighteenth century, the word "telephone" was used to refer to a microphone made of string (a cup is strung with string), and the modern telephone owes its appearance to Alexander Graham Bell, and the early telephone principle is that the speaking sound is a composite vibration in the airIt can be transmitted to a solid and transmitted through an electrical pulse on a conductive metal. 3. It is generally believed that the telephone was invented by the British Alexander Bell, because he was the first person to obtain a patent for the invention of the telephone, but on June 15, 2002, the United States Congress agreed on a bill, identifying Antonio Meucci as the inventor of the telephone, Meucci is thus known as the father of the telephone. The first telephone in the world was invented by Antonio Meucci, who had already proposed the prototype of the telephone in 1849.
4, the telephone is a kind of remote communication equipment that can transmit and receive sound. As early asIn the 18th century in Europe, the word telephone was used to refer to a microphone made of string (a cup is strung with string). The telephone was invented by Alexander Graham Bell, and the principle of the early telephone is that the voice is a composite vibration in the air, which can be transmitted to a solid body, and transmitted by electrical impulses on conductive metals.
5. The telephone was inspired by the invention of the telegraph. However, from the invention of the telegraph by Samuel Morse in 1837 to the invention of the telephone in 1876, it took almost 40 years. After the invention of the telegraph, because of its fast transmission speed, it soon received attention from all countries, but the telegraph needsDraft in advance, some also have to turn the telegram into code, and then the text or digital telegram to the telegraph office, by the operator in order to send out.
1. At the end of the year, the phone number appeared. 1 It was proposed by a physician who was inspired by the measles epidemic in Massachusetts, because if the operator fell ill, the telephone lines throughout the city would be paralyzed. In 11881, the British electrical technician PI Xiaopu set up a pair of open-air telephones along the street of Shanghai's sixteen shops, and paid 36 yuan to talk once. 1 This is China's NoA phone. 2. The telephone was invented in 1876. Alexander Graham Bell patented the telephone in 1876, an invention that revolutionized how people communicate. In the history of telecommunications, Alexander Graham Bell's invention of the telephone was one of the great milestones. 3, in the International Telecommunication Union published "Telephone 100 years" book mentioned that in 968 AD, the Chinese invented a called "bamboo letter" thing, it is considered to be the prototype of today's telephone.Although these stories reflect the ingenuity of our ancestors, to understand the development of modern telecommunications technology, we have to start in Europe. 4. From then on, Bell and Waltham began the difficult design of the telephone, and finally on June 2, 1875, a call from Bell in the experiment was accidentally transmitted to Waltham's ear in the other room, becoming the first voice transmission in the history of the telephone. The site of Bell's invention in Boston is also permanently commemorated. On March 7, 1876, Bell received a patent for the telephone, and telephone technology developed rapidly.