Telephone equipment
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2008-7-5 9:57:03
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Phone signals through two-way transmission of voice equipment.
The history of the telephone and invented the improvement include: toner microphone, artificial exchange board, dial-up disc, automatic telephone switches, program-controlled telephone switches, dual tone multi-frequency dial, voice, such as digital sampling. In recent years, new technologies, including, ISDN, DSL, analog mobile phones and digital mobile telephone.
This industry is usually divided into telephone equipment manufacturers and telephone network operators. Historically, network operators usually have a national monopoly. In recent years, with the global telecommunications market liberalization and integration, and technology development, a number of emerging operators in the same competition in the market situation. For example, the Bell System, AT & T owned subsidiary of the U.S. phone market to 80%. 1984, the U.S. Justice Department's antitrust lawsuit, Bell System was forced to split into several independent of the local Bell companies.
Another note to "call" the origin of the word:
"Telephone" is the Japanese Shengzao the Chinese word for the English translation of the telephone. When the Chinese people on this word to the English, who translated as "wind German law." In a period of time, "telephone" and "moral law wind" two generic name. But later, "German law Wind" This name was finally disappear. Since the early years of this century, a group in Japan Shaoxing students who had signed to return to his hometown to write a long letter, which detailed the circumstances of modern Japan, Lu Xun's name which is also included. The letter said that "telephone", specifically notes: "to convey electrical speech, the Chinese translation is' German law wind ', as the phone cut." Therefore, the future called "telephone."
Telephone communication through sound energy and electric energy conversion and use "," medium to transmit this language as a communication technology. Two users to communicate, the simplest form is to use a pair of two telephone lines to link up.
a) When the speaker sent to pick up the phone in front of it for his speech, the vocal encouragement of the vibration of air vibration, acoustic form.
b) acoustic role in sending it is, to produce current, known as the current voice.
c) Current along the lines of voice transmission to the other side of the telephone receiver,
d) and receiver role and sent it for exactly the opposite - the currents into sound waves, spread to people through the air in the ear.
In this way, completed the most simple-call process.
The history of the telephone and invented the improvement include: toner microphone, artificial exchange board, dial-up disc, automatic telephone switches, program-controlled telephone switches, dual tone multi-frequency dial, voice, such as digital sampling. In recent years, new technologies, including, ISDN, DSL, analog mobile phones and digital mobile telephone.
This industry is usually divided into telephone equipment manufacturers and telephone network operators. Historically, network operators usually have a national monopoly. In recent years, with the global telecommunications market liberalization and integration, and technology development, a number of emerging operators in the same competition in the market situation. For example, the Bell System, AT & T owned subsidiary of the U.S. phone market to 80%. 1984, the U.S. Justice Department's antitrust lawsuit, Bell System was forced to split into several independent of the local Bell companies.
Another note to "call" the origin of the word:
"Telephone" is the Japanese Shengzao the Chinese word for the English translation of the telephone. When the Chinese people on this word to the English, who translated as "wind German law." In a period of time, "telephone" and "moral law wind" two generic name. But later, "German law Wind" This name was finally disappear. Since the early years of this century, a group in Japan Shaoxing students who had signed to return to his hometown to write a long letter, which detailed the circumstances of modern Japan, Lu Xun's name which is also included. The letter said that "telephone", specifically notes: "to convey electrical speech, the Chinese translation is' German law wind ', as the phone cut." Therefore, the future called "telephone."
Telephone communication through sound energy and electric energy conversion and use "," medium to transmit this language as a communication technology. Two users to communicate, the simplest form is to use a pair of two telephone lines to link up.
a) When the speaker sent to pick up the phone in front of it for his speech, the vocal encouragement of the vibration of air vibration, acoustic form.
b) acoustic role in sending it is, to produce current, known as the current voice.
c) Current along the lines of voice transmission to the other side of the telephone receiver,
d) and receiver role and sent it for exactly the opposite - the currents into sound waves, spread to people through the air in the ear.
In this way, completed the most simple-call process.
