Its goal is to achieve the highest data transmission speed of 1Mbps (the effective transmission speed is 72 1kbps), and the maximum transmission distance is 10 meter. Users can use the 2.4GHz ISM (industrial, scientific and medical) band without permission, and set 79 channels with the bandwidth of 1MHz on it, switching 65,438 times per second. 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 seven recipients at the same time. Therefore, the calling party can connect to a subnet called piconet with 7 receivers and 8 devices. The receiver in a piconet can be the receiver of more than two piconets at the same time. 1July, 999, Bluetooth released the formal specification BluetoothVersion 1.0. Mobile phones and laptops that meet this specification will be available at the end of 1999 or the beginning of 2000. Companies that claim to commercialize Bluetooth technology are increasing day by day. At present, the number of member enterprises of Bluetooth standardization organization "BluetoothSIG" has increased to more than 800.
The original intention of Bluetooth technology is to use a small, low-cost wireless communication technology instead of cables to connect smart phones with notebook computers, palmtop computers and various digital information devices. Then form a personal network, so that all kinds of information-based mobile portable devices within its scope can share resources seamlessly. According to the prediction of foreign authoritative organizations, in a few years, hundreds of millions of digital mobile phones, PCs and various information devices around the world will use the wireless interface based on Bluetooth technology as the standard configuration. Bluetooth technology will develop rapidly in many fields, and its typical application environment includes wireless office, automobile industry, medical equipment and so on. Bluetooth will play an important role in people's daily life and work, with great market potential. This technology is becoming the investment hotspot in 2 1 century.
The so-called Bluetooth technology is actually a short-distance wireless communication technology. Bluetooth technology can effectively simplify the communication between mobile communication terminal devices such as palmtop computers, notebook computers and mobile phones, and can also successfully simplify the communication between these devices and the Internet, thus making the data transmission between these modern communication devices and the Internet faster and more efficient, and broadening the road for wireless communication. More generally speaking, Bluetooth technology enables modern portable mobile communication equipment and computer equipment to access the Internet without cables, and its practical application can be extended to various household appliances such as automobiles, consumer electronics and information appliances, forming a huge wireless communication network.
The background of the formation of "Bluetooth" is as follows:1In 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-distance wireless communication technology, with the aim of providing a short-distance and low-cost wireless transmission application technology. The five vendors also set up a Bluetooth Special Interest Group to make Bluetooth technology 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 radio frequency and mobile phone software, and IBM and Toshiba are responsible for the development of notebook computer interface specifications. 1999 In the second half of the year, five famous industry giants, including Microsoft, Motorola, Sankang, Lucent and Bluetooth Task Force, initiated the establishment of a Bluetooth technology promotion organization, which set off a worldwide "Bluetooth" craze. The global industry is about to develop a large number of applications of Bluetooth technology, which makes Bluetooth technology present an extremely broad market prospect, indicating that a magnificent global wireless communication wave will be ushered in at the beginning of 2 1 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 wireless data and sound transmission from single point to multipoint within the radius of 10 meter, and the data transmission bandwidth can reach 1Mbps. The communication medium is electromagnetic wave with frequency between 2.402GHz and 2.480GHz.
Characteristics of Bluetooth communication technology
■ Bluetooth works in the globally open 2.4GHz ISM (i.e. industrial, scientific and medical) frequency band;
The frequency band is divided into several frequency hopping channels by using frequency hopping spread spectrum technology. 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 reach1mbit/s;
■ Low power consumption and good communication security;
■ It can be connected across obstacles within an effective range without special communication angle and direction requirements;
■ Support voice transmission;
■ Networking is simple and convenient
The Use of Bluetooth Communication Technology
Bluetooth technology is a new technology and has not been widely used. At present, many Bluetooth devices are still in the laboratory testing stage. But what is certain is that in the future, most devices with infrared wireless data communication function can use Bluetooth technology to realize wireless connection. 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 and networking of multiple devices.
Recognition by manufacturers and consumers
Bluetooth technology has been responded by more than 2000 enterprises, so it has great development and production capacity. Bluetooth has a high popularity and consumers are very interested in this technology.
Implantation cost
At present, Bluetooth devices on the market are still relatively rare. Bluetooth adapters with USB interface, Bluetooth PC cards and Bluetooth mobile phones have been marketed with higher prices. It can be seen that the implantation cost of Bluetooth in the early stage of development is still relatively high. However, it is estimated that the implantation cost after mass production can be below $30. In the mature period of Bluetooth technology, the implantation cost should be controlled within 10 USD.
Infrared data association is the configuration standard of a new generation of mobile phones, which supports data exchange between mobile phones and computers and other digital devices. Infrared communication has the characteristics of low cost, convenient connection, simple use and compact structure, so it has been widely used in small mobile devices. Through infrared data association, various mobile devices can exchange data freely.
Infrared is an electromagnetic wave with a wavelength between 750nm and 1mm, and its frequency is higher than that of microwave and lower than that of visible light, which is invisible to human eyes. Because of the short wave length, infrared ray has poor diffraction ability to obstacles, which is more suitable for point-to-point linear data transmission that requires short-distance wireless communication, and the transmission rate can reach 16Mbps at the fastest. Infrared Data Association (IRDA) limits the wavelength range of light waves used in infrared data communication to 850 nm to 900 nm.
It is very simple to surf the internet wirelessly with a mobile phone equipped with infrared data association. You don't need to connect cables and PC cards, you can surf the Internet directly by setting an infrared connection protocol.
Infrared and Bluetooth are commonly used wireless data transmission protocols at present, so what are their differences in technical application? Or what are the advantages and disadvantages of these two technologies? Let's take a look at the differences between them through this table ~
What is Bluetooth?
Bluetooth is a low-cost, large-capacity short-range wireless communication specification. Bluetooth notebook computer is a notebook computer with Bluetooth wireless communication function. There is a legendary story about the name Bluetooth. /kloc-in the 0/0 century, the Nordic princes fought for hegemony, and the Danish king stepped forward. With his unremitting efforts, the bloody war was stopped and all parties sat at the negotiating table. Through communication, the princes bridged their differences and became friends. Because the Danish king loved Lan Mei so much that his teeth were dyed blue, he was called the king of Bluetooth, so Bluetooth became synonymous with communication. 1000 years later, a new wireless communication standard came out, and people named it Bluetooth.
1995, Ericsson first proposed the concept of Bluetooth. Bluetooth profile works in microwave band, the transmission rate is 1m bytes per second, and the maximum transmission distance is 10m, which can be achieved by increasing the transmission power. Bluetooth technology is open all over the world and has good compatibility all over the world. The whole world can be connected into a whole through a low-cost invisible Bluetooth network.
Bluetooth technology is not only used in computers, but also in many electronic devices, such as mobile phones, digital cameras, video cameras, printers, fax machines, household appliances, etc., to realize wireless connection without dragging a tail (connecting cable). With the popularity of Bluetooth technology, home improvement is no longer worried about the wiring of electrical appliances; When using household appliances, you don't have to worry about too many remote controls. A mobile phone or a car key can do everything. When you are away from home, the company's work arrangements and photos of family members can be obtained anytime and anywhere; You don't have to queue up to pay by punching in. You can pass by the payment point and do it easily without entering the door ... The wide application of Bluetooth technology will make our life very easy.
Bluetooth connection between mobile phone and computer: (taking Sony Ericsson as an example)
First of all, correctly install the Bluetooth adapter that drives you on the computer (I won't go into details here, please refer to relevant materials if you don't understand).
[pairing]
Plug in the adapter to connect it, and the Bluetooth logo in the taskbar should change from stopped red to connected white.
Go to the phone menu-Connect-Bluetooth-Match Device-Add Device, and then the phone will start searching for Bluetooth devices around. You will find your Bluetooth adapter soon. Select the device you are searching for and enter the identification code (just set it yourself, as long as both sides are the same, Sony Ericsson I usually enter four zeros). After confirmation, the computer will prompt you to enter the identification code. Just after entering the identification code, the two devices are paired.
[computer-> mobile phone]
When transferring things to the mobile phone, only files that can be recognized by the mobile phone can be transferred to the mobile phone, such as: picture-jpg；; Theme-thm; Audio -mid, amr；; JAVA-jar, game -mpn, etc.
Keep the phone's Bluetooth and Bluetooth adapters paired and turned on. Select the file to send and click the right mouse button-Send to Bluetooth, select the device and send. The file name and size of the transmitted file will be prompted on the mobile phone, asking if it has been received. Sometimes you receive it automatically without asking, which is related to the settings. After receiving it, the mobile phone will be automatically stored in different categories.
[mobile phone-> computer]
When sending something from a mobile phone (before pairing), select the file to send-More-Send-via Bluetooth, and then select the target device to send.
Note: Sony Ericsson mobile phone can only send pictures-JPG; Audio -mid, amr；; Theme -thm. Others such as JAVA-jar and game -mpn cannot be sent.