What is Bluetooth? What's the use?

"Bluetooth" is the name for a low-power, short-range wireless connection technology standard. The word "Bluetooth" is taken from Harald, a king who unified Denmark in the 10th century AD. The nickname of Harald II is "Bluetooth". The original advocates of "Bluetooth" technology were five world-renowned computer and communications companies: Ericsson, IBM, Intel, Nokia, and Toshiba. In May 1998, the "Bluetooth" Special Interest Group-SIG was established. The organization adopted a strategy of transferring the patented technology to the industry free of charge to achieve its goal of global unified standards.

The goal is to achieve a maximum data transmission speed of 1Mbps (effective transmission speed is 721kbps) and a maximum transmission distance of 10 meters. Users can use the 2.4GHz ISM (Industrial, Scientific and Medical) frequency band without permission. , 79 channels with a bandwidth of 1MHz are set up on it, and the frequency is switched 1,600 times per second and the spectrum diffusion technology of hobbing method is used to realize the transmission and reception of radio waves. This is the origin and characteristics of Bluetooth technology. Devices that use Bluetooth technology to communicate are divided into the "calling party" and its communication counterpart, the "recipient", which determines the frequency hobbing mode. The calling party can communicate with 7 recipients at the same time. Therefore, the calling party and 7 recipients and 8 devices can be connected into a subnet called Piconet (sawtooth network). A recipient within a Piconet can serve as the recipient of more than two Piconets at the same time. In July 1999, Bluetooth announced the official specification BluetoothVersion 1.0. Mobile phones and laptops complying with this specification will be available in late 1999 or early 2000. The number of companies claiming to commercialize Bluetooth technology is increasing day by day. Currently, the number of member companies of the Bluetooth standardization group "BluetoothSIG (Special Interest Group)" has increased to more than 800.

The original design intention of "Bluetooth" technology is to connect smart mobile phones with laptops, PDAs and various digital information devices without using cables, but using a small, low-cost Wireless communication technologies are connected to form a network around individuals, allowing all kinds of information-based mobile and portable devices within its range to seamlessly share resources. According to foreign authoritative organizations, in a few years, hundreds of millions of digital mobile phones, PCs and various information devices around the world will use wireless interfaces based on Bluetooth technology as a standard configuration. Bluetooth technology will develop rapidly in various fields. Its typical application environments include wireless office environment (Wireless Office), automotive industry, medical equipment, etc. Bluetooth will play an important role in people's daily lives and work, and the market potential is huge. This technology is becoming an investment hotspot in the 21st century.

The so-called Bluetooth technology is actually a short-distance wireless communication technology. The use of "Bluetooth" technology can effectively simplify the connection between mobile communication terminal devices such as handheld computers, laptops, and mobile phones. It can also successfully simplify the communication between the above devices and the Internet, thereby making the data transmission between these modern communication devices and the Internet faster and more efficient, and broadening the path for wireless communication. To put it more simply, Bluetooth technology enables some modern mobile communication devices and computer devices that are easily portable to connect to the Internet without the help of cables, and can access the Internet wirelessly. Its practical application scope can also be expanded to various home appliances and consumer electronics. Products and information appliances such as cars form a huge wireless communication network.

The background of the formation of "Bluetooth" is as follows: In May 1998, five well-known manufacturers, including Ericsson, Nokia, Toshiba, IBM and Intel, proposed when jointly carrying out standardization activities for short-range wireless communication technology. Bluetooth technology is introduced, and its purpose is to provide a short-distance, low-cost wireless transmission application technology. These five manufacturers also established a Bluetooth Special Interest Group to enable Bluetooth technology to become the future wireless communication standard. Chip overlord Intel is responsible for the development of semiconductor chips and transmission software, Ericsson is responsible for the development of wireless 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, Sancom, Lucent and five companies from the Bluetooth Task Force jointly initiated the establishment of the Bluetooth Technology Promotion Organization, thus setting off a "Bluetooth" craze worldwide. . The global industry is about to develop a large number of Bluetooth technology application products, which makes Bluetooth technology present an extremely broad market prospect and indicates that the beginning of the 21st century will usher in a magnificent wave of global wireless communications.

What is Bluetooth?

Bluetooth is a short-range wireless data communication technology standard jointly 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 10 meters, and its data transmission bandwidth can reach 1Mbps. The communication medium is electromagnetic waves with frequencies between 2.402GHz and 2.480GHz.

Characteristics of Bluetooth communication technology

■Bluetooth works in the globally open 2.4GHz ISM (ie Industrial, Scientific, Medical) frequency band;

■Uses frequency hopping Spectrum spreading technology divides the frequency band into several frequency hopping channels (hop channels). In a connection, the radio transceiver continuously "hops" from one channel to another according to a certain code sequence;

■One Bluetooth device can establish connections with seven other Bluetooth devices at the same time;

■Data transmission rate can reach 1Mbit/s;

■Low power consumption and good communication security;

■Can connect over obstacles within the effective range, with no special communication perspective and direction requirements;

■Supports voice transmission;

■Network Simple and convenient

Uses of Bluetooth communication technology

Bluetooth technology is an emerging technology and has not yet been widely used. Currently, many Bluetooth devices are still in the laboratory testing stage. But what is certain is that most devices with infrared wireless data communication capabilities can now use Bluetooth technology to achieve wireless connections in the future. At the same time, the network characteristics and voice transmission technology of Bluetooth technology enable it to realize certain specific functions that cannot be achieved by infrared technology, such as wireless phones, multi-device networking, etc.

Recognition of manufacturers and consumers

Bluetooth technology has received responses from more than 2,000 companies, thus having huge development and production capabilities. Bluetooth has gained a lot of popularity, and consumers are very interested in this technology.

Implantation cost

Bluetooth devices currently on the market are still relatively rare. USB interface Bluetooth adapters, Bluetooth PC cards and Bluetooth mobile phones are already on the market, and the prices are very high. It can be seen that the implantation cost of Bluetooth in the early development stage is still relatively high. However, it is estimated that the implantation cost can be less than 30 US dollars after mass production. When Bluetooth technology matures, the cost of implantation should be controlled within $10.