Mobile phone history? Inventor? Time?

The mobile phone was first invented by American IT giant Motorola. 1983, the world's first mobile phone finally came out.

Motorola DynaTAC 8000X, the world's first mobile phone, weighs 2 pounds, talks for half an hour and costs $3,995. This is really the most expensive brick.

But in the view of Rudy Krolopp, the designer of 1984, or DynaTAC 8000X, this mobile phone is not expensive, nor is it a brick.

Klopp, who has retired for many years, is 74 years old. Talking about DynaTAC 8000X, he is still full of energy: "Our huge development team has made history."

The development cycle of DynaTAC 8000X has exceeded 10 years. At that time, Martin Cooper, who was responsible for the research and development of Motorola's wireless field and was later honored as the father of mobile phones, appointed Krolopp as the project leader to be responsible for the research and development of the world's first mobile phone. There are three names on DynaTAC 8000X's patent certificate, Krolopp, Cooper and John Mitchell, then head of Motorola's communications department.

Krolopp recalled: "1972, 12 One day in February, Martin called me to the office and said,' We need to develop a mobile phone. I responded in surprise:' What is a mobile phone? . "

Kropper and his team accepted the project and asked to make a mobile phone model within six weeks. This task is urgent because the Federal Communications Commission is considering whether to allow AT & amp； T set up a mobile network in the American market to provide wireless services. Moreover, at & amp； T also has its own mobile phone development plan. Motorola doesn't want to let huge business opportunities slip away.

Finally, Krolopp and his team submitted the conceptual model of the world's first mobile phone. Krolopp recalled: "We put the model in the hands of engineers. Eight people in the room think the model is too small. Therefore, we stipulate that anyone who questions the size of the product again should go out immediately. "

Nobody left the room. After 10 years of development, the world's first mobile phone finally came out in 1983 at a cost of 10 billion dollars. Of course, the establishment of the base station is also a major reason for delaying the sale.

Now, seeing Motorola's Razr V3 mobile phone, Krolopp expressed heartfelt sigh for the rapid development of science and technology. At the same time, he also pointed out that the current products are only the tip of the iceberg in the long history of mobile phone development. Krolopp said: "We were able to design Razr V3, but it was absolutely impossible to make the battery, antenna and keyboard so small. The development of science and technology is really changing with each passing day! "

At present, the so-called second generation mobile phone (2G) is the most widely used in the world, which is mainly based on GSM in Europe and CDMA in the United States, as well as the IDEN network standard of Motorola and PDC used in Japan. They are all in digital format. Besides voice communication, they can also send and receive short messages and wireless application protocols. GSM is the most popular in Chinese mainland and Taiwan Province province, and CDMA mobile phones are also very popular. At present, the whole industry is in the process of migrating to the fourth generation mobile phone (4G). In addition to typical telephone functions, some mobile phones also include PDA, game machine, MP3, camera, photography, recording, GPS, Internet access, etc., and there is a trend to develop mobile phone functions to PDA. The microphone and earphone of the telephone and the corresponding microphone and receiver are all installed on one handle. Formerly known as mobile phones, handheld devices and mobile phones, they are portable telephone terminals that can move in a large range.

At present, mobile phones are divided into smart phones and non-smart phones. Generally, smart phones have better performance than non-smart phones, but non-smart phones are more stable than smart phones. Most non-smart phones, like smart phones, use ARM-based CPU in the UK. However, smart phones have high frequency and fast running speed. (For example, the main frequency of the smartphone Motorola DROID X is as high as 1000 MHz, and the main frequency of the Nokia N97 is also 434 MHz), while the main frequency of non-smart phones is relatively low and the running speed is relatively slow. (For example, the main frequency of Nokia 5000 is 50 MHz, and the main frequency of Motorola ZN300 is 17 1 MHz).