1973 One day in April, a man was standing in the street. He took out a wireless phone with about two bricks and smashed it to stop passers-by. This man is marty cooper, the inventor of mobile phone. At that time, Cooper was an engineer of a famous American company.
The world's first mobile phone is an opponent who has been working in alexander bell's laboratory. The other party is also developing a mobile phone, but it has not been successful. Cooper later recalled that he called Joe and heard a voice on the receiver and replied politely.
This year, competitive products of scientific and technological personnel have blossomed everywhere, which has brought great convenience to our modern life.
Marty cooper is 74 years old. It took him 29 years to start his own news agency. At present, he is the chairman and CEO of the company. Marty cooper's idea at that time was to let the media know that wireless communication, especially small mobile phones, was very valuable.
In addition, he hopes to arouse the interest of the Federal Communications Commission and support its cooperation with AT&T; T, also a large communication company in America).
In fact, looking back, we will find that the concept of mobile phone first appeared in the 1940s, when alexander bell Lab, the largest communication company in the United States, began trial production.
1946, alexander bell laboratory invented the first so-called mobile phone. But because of its large size, researchers can only put it on the shelf in the laboratory, and people gradually forget it.
Until the late 1960s, AT&T (AT&; T) and Motorola are only interested in this technology. At that time, at & amp； Company T rented a large mobile wireless phone, which customers can install on the truck.
At&T Company. T's vision is to develop a mobile phone with the power of 10W in the future to communicate with the radio equipment on the truck. According to Cooper, this mobile phone is too heavy to open.
Therefore, he applied to the Federal Communications Commission to require that the power of mobile communication equipment can only be 1 watt, and the maximum power cannot exceed 3 watts. In fact, the maximum radio power of most mobile phones is only 500 MW.
From 1973 to 1985, the first real mobile phone was born.
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Nowadays, mobile phones are divided into smart phones and non-smart phones (feature phones). Generally, the performance of smart phones is better than that of non-smart phones, but the performance of non-smart phones is more stable than that of smart phones. Most non-smart phones and smart phones use the CPU of British ARM company.
Smart phones have higher frequency, faster speed, faster processing tasks and more convenient daily activities (for example, the frequency of N8 1 is 369MHz), while the frequency of smart phones is relatively low and the running speed is slow (for example, the frequency of CHZ 5000 is 50).
Smart phones, like personal computers, have independent operating systems, mostly large-screen machines, touch capacitive screens and some resistive screens, which are powerful and practical. Can be installed by users themselves, including programs provided by third-party service providers such as games.
Through this program, the functions of mobile phones can be continuously expanded, and the common names of mobile phones can be realized through mobile communication networks. The popular view is the simple formula of "1+1=" and "PDA+mobile phone = smart phone".
In a broad sense, smart phones are the main functions of pda, especially personal information management, browser and email functions based on wireless data communication. Smart phones provide users with enough screen size and bandwidth, which is easy to carry and provides a broad stage for software operation and content service.
In this respect, many value-added services can be launched, such as: stock, news, weather, transportation, goods, application download, music picture download and so on.
Baidu Encyclopedia-The Origin and Development of Mobile Phone
Baidu encyclopedia-mobile phone