mobile phone

Article

October 23, 2021

Mobile phones, also known as portable phones or mobile phones, referred to as mobile phones, are portable phones that can be used in a larger area, as opposed to fixed phones (landlines). Before the mid-1990s, it was expensive and bulky, so it was also commonly known as Big Brother. Gradually popularized in the late 1990s, it has become the world's highest-selling consumer electronic product, and it is also one of the indispensable electronic products for modern people. At present, the fourth and fifth generation mobile communication technologies are the most widely used in the world. The fourth-generation mobile communication technology is based on LTE, which supports cellular network mobile phone technology for high-speed data transmission. 4G service can transmit voice (call) and information, video, (email, instant messaging, etc.) at the same time, it is digital. The entire industry is currently migrating to the fifth-generation mobile communication technology. The appearance of a mobile phone should generally include at least one LCD display and a set of buttons. Currently, mobile phones with touch screens have fewer buttons. In addition to the typical telephone functions, modern mobile phones also contain more functions such as personal digital assistants, game consoles, MP3s, cameras, recorders, GPS, and Internet connection. They are collectively referred to as smart phones.

Development History

Feature phone

The earliest telephone network that used cellular base station networks to communicate with mobile phones was called the "first generation" of mobile communications (1G). This is also during the 1980s to the 1990s. In film and television works, mobile phones used by characters from the wealthy class were often seen. A well-known pioneer in this type of mobile communication system is Dr. Martin Cooper of Motorola. This kind of mobile phone has a variety of standards, such as NMT, AMPS, TACS, but basically use frequency division multiplexing to only carry out voice communication, the reception is unstable, and the confidentiality is insufficient, and the wireless bandwidth is not fully utilized. This kind of mobile phone is similar to a simple radio duplex station, which is locked to a certain frequency during a call, so the call can be eavesdropped by using a tunable frequency radio station. At this time, voice transmission is analog, and only voice traffic can be transmitted. Due to the limitations of the battery capacity at the time, the huge antenna required for analog modulation technology, and the development of integrated circuits, until Motorola launched the StarTAC foldable mobile phone, this type of mobile phone could only be regarded as "mobile". Cannot meet the "carry-on" standard. This first-generation mobile phone was often called "brick" or "black king" by many people because of its appearance in the early days. Because of the impressions rendered in film and television works, this huge old-fashioned mobile phone is also known as the "Big Brother" among the folks. Hong Kong's peanut oil brand Lion Ball made a "Big Brother" shaped water bottle as a gift in 1987, and it became popular, so Hong Kong people also call this kind of mobile phone "kettle", "Big Brother". When the first-generation mobile phone network was introduced in the early days, the use of "Big Brother" was a status symbol. Take Hong Kong as an example: In 1985, a "Big Brother" was worth 29,000 Hong Kong dollars, and by the 1990s, the value still reached 13,000 Hong Kong dollars. Taiwan's first-generation analog mobile phone network (using the North American AMPS system) was introduced by the General Administration of Telecommunications of the Ministry of Transportation in 1989, and officially withdrew from the telecommunications service market in November 2001. The originally assigned door numbers with prefixes of 090 and 091 were converted to door numbers with prefixes of 0910 and 0911 under the second-generation GSM mobile phone network, respectively. The second-generation mobile phone (2G) evolved from an analog voice communication network to a digital signal exchange communication network. It originated in the early 1990s and gradually spread throughout the world after the mid-1990s. It was still widely distributed around the world in the mid-2010s. Usually these mobile phones use the European standard GSM, CDMA or PHS, which are very mature standards, and have stable call quality and suitable standby time. This type of mobile phone has mobile phone communication technology such as time and date transmission, and is generally defined as unable to directly transmit information such as e-mail and software; it only has mobile phone communication technical specifications such as time and date transmission. In the development of the second-generation mobile phone network, in order to adapt to the increasing demand for data communication, some enhanced transmission standards (also known as 2.5G or even 2.75G) are successively supported on mobile phones.

INSERT INTO `wiki_article`(`id`, `article_id`, `title`, `article`, `img_url`) VALUES ('NULL()','移动电话','mobile phone','','https://upload.wikimedia.org/wikipedia/commons/thumb/4/43/Telephone-keypad.svg/langzh-275px-Telephone-keypad.svg.png')