What is the Bluetooth of mobile phone? What's the use? I heard that it is useful for handheld computers. I wonder if it has any effect on desktop computers. What's the effect?

"Bluetooth" is the pronoun of a low-power short-distance wireless connection technical standard. The word "Bluetooth" comes from the nickname of Harald II, a king who unified Denmark in the 1th century, that is, "Bluetooth". The original proponents of Bluetooth technology are five world-famous computer and communication companies: Ericsson, IBM, Intel Intel, Nokia Nokia, and Toshiba. And in May 1998, the "Bluetooth Special Interest Group-SIG" was established. This organization adopted the strategy of transferring the patented technology to the industry free of charge, in order to achieve its goal of global standardization. Its goal is to achieve the highest data transmission speed of 1Mbps (the effective transmission speed is 721kbps) and the maximum transmission distance of 1 meters. Users can use the ISM (industrial, scientific and medical) band of 2.4GHz without permission, set up 79 channels with a bandwidth of 1MHz on it, and use the frequency switching technology of 1,6 times per second and hobbing to realize the transmission and reception of electric waves. This is the origin and characteristics of Bluetooth technology. Devices that use Bluetooth technology to communicate can be divided into "calling party" and "receiving party" which determine the frequency hobbing mode. The calling party can communicate with 7 receivers at the same time. Therefore, the calling party can be connected with 7 receivers and 8 devices to a subnet named Piconet. The recipient in a Piconet can be the recipient of more than two piconets at the same time. In July 1999, Bluetooth released the formal specification BluetoothVersion 1.. Mobile phones and notebook computers complying with this specification will be available in late 1999 or early 2. The number of enterprises claiming to commercialize Bluetooth technology is increasing day by day. At present, the number of member enterprises of Bluetooth standardization group "BluetoothSIG" has increased to more than 8. The original intention of Bluetooth technology is to connect smart mobile phones with notebook computers, palmtop computers and all kinds of digital information equipment with a small, low-cost wireless communication technology instead of cables. And then form a personal network, so that all kinds of information-based mobile portable devices within its scope can seamlessly realize resource sharing. According to the prediction of foreign authoritative organizations, in a few years, hundreds of millions of digital mobile phones, PCs and various information devices all over the world will use the wireless interface based on Bluetooth technology as a standard configuration. Bluetooth technology will develop rapidly in many fields, and its typical application environments include Wireless Office, automobile industry, medical equipment and so on. Bluetooth will play an important role in people's daily life and work, and its market potential is huge. This technology is becoming a hot investment spot in the 21st century. The so-called Bluetooth technology is actually a short-distance wireless communication technology. Using Bluetooth technology, the communication between mobile communication terminal devices such as handheld computers, notebook computers and mobile phones can be effectively simplified, and the communication between these devices and the Internet can also be successfully simplified, thus making the data transmission between these modern communication devices and the Internet more rapid and efficient, and broadening the road for wireless communication. To put it more popularly, Bluetooth technology enables modern portable mobile communication equipment and computer equipment to be connected to the Internet without cables, and its practical application can be extended to various household appliances, consumer electronics products and information appliances such as automobiles, forming a huge wireless communication network. The background of the formation of "Bluetooth" is as follows: In May 1998, five famous manufacturers, such as Ericsson, Nokia, Toshiba, IBM and Intel, put forward Bluetooth technology when jointly carrying out the standardization activities of short-range wireless communication technology, with the aim of providing a short-range and low-cost wireless transmission application technology. The five vendors also set up a Bluetooth Special Interest Group to make Bluetooth technology a future wireless communication standard. Intel, the chip overlord, is responsible for the development of semiconductor chips and transmission software, Ericsson is responsible for the development of radio frequency and mobile phone software, and IBM and Toshiba are responsible for the development of notebook computer interface specifications. In the second half of 1999, the famous industry giants Microsoft, Motorola, Sankang, Lucent and five companies of the Bluetooth Task Force jointly launched the Bluetooth technology promotion organization, which set off a worldwide "Bluetooth" craze. The global industry is about to develop a large number of application products of Bluetooth technology, which makes Bluetooth technology present an extremely broad market prospect and indicates that a magnificent global wireless communication wave will be ushered in at the beginning of the 21st century. What is Bluetooth? Bluetooth is a technical standard for short-range wireless data communication proposed by Toshiba, Ericsson, IBM, Intel and Nokia in May 1998. It can realize single-point to multi-point wireless data and sound transmission within a radius of 1 meters, and its data transmission bandwidth can reach 1Mbps. The communication medium is electromagnetic wave with frequency between 2.42GHz and 2.48GHz. Characteristics of Bluetooth communication technology ■ Bluetooth works in the global open 2.4GHz ISM (i.e. industrial, scientific and medical) frequency band; Using frequency hopping spectrum spreading technology, the frequency band is divided into several hop channel. In a connection, the radio transceiver constantly "hops" from one channel to another according to a certain code sequence; ■ One Bluetooth device can establish connection with seven other Bluetooth devices at the same time; ■ The data transmission rate can reach 1 mbit/s; ■ Low power consumption and good communication security; ■ It can be connected over obstacles within the effective range, and there is no special communication angle and direction requirement; ■ Support voice transmission; ■ Networking is simple and convenient. Bluetooth communication technology is a new technology, which has not been widely used. At present, many Bluetooth devices are still in the laboratory test stage. But it is certain that most devices with infrared wireless data communication function can use Bluetooth technology to realize wireless connection in the future. At the same time, the network characteristics and voice transmission technology of Bluetooth technology enable it to realize some specific functions that infrared technology cannot, such as wireless telephone, networking of multiple devices and so on. The recognition of manufacturers and consumers Bluetooth technology has won the response of more than 2, enterprises, thus having a huge development and production capacity. Bluetooth has a high popularity, and consumers are very interested in this technology. Implantation cost Bluetooth devices on the market are still relatively rare. Bluetooth adapter with USB interface, Bluetooth PC card and Bluetooth mobile phone already have market-oriented products with high prices. It can be seen that the implantation cost in the early development stage of Bluetooth is still relatively high. However, it is estimated that the implantation cost can be below $3 after mass production. In the mature period of Bluetooth technology, the implantation cost should be controlled within $1.