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The inventor of the telephone was Edison?
The improvements and inventions of telephone in history include: toner microphone, manual switchboard, dial, automatic telephone exchange, program-controlled telephone exchange, dual-tone multi-frequency dialing, voice digital sampling and so on. In recent years, new technologies include ISDN, DSL, VoIP, analog mobile phone and digital mobile phone.
Extended data:
With the rapid development of IT technology, the processing capacity of embedded terminal equipment is getting stronger and stronger. At the beginning of this century, a telephone with personal digital assistant (PDA) appeared.
In addition to the complete fixed-line telephone function, smart phones usually have the functions of large-capacity business card management, incoming and outgoing call management, preventing telephone harassment (telephone firewall), enterprise group telephone business card management (internal business card), and many other functions to assist office work, such as scheduling, notes, calendars, calculators, etc.
Early smart phones had the ability to dial-up Internet to exchange information, and realized the functions of sending and receiving short messages. With the development of fixed-line smart phones in China in recent ten years, its processing capacity has been continuously strengthened, and the functions of smart phones have gradually increased.
Baidu encyclopedia-telephone
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