What is Bluetooth?

question 1: what is bluetooth? What's it for? Bluetooth is a transmission software.

After Bluetooth is turned on for both mobile phones,

you can send music files, picture files, etc. for free when you search for the other party. .

It's free,

but it can't be too far away. .

Bluetooth can also be matched with Bluetooth headsets.

Bluetooth headsets are wireless.

more convenient. .

question 2: what does bluetooth mean? What's the function? Bluetooth is the name of a wireless transmission tool! Can realize wireless transmission of text, pictures, video software and so on! It is only effective to stay within 1 meters!

question 3: what is bluetooth? What is Bluetooth

1. The origin of Bluetooth name

The name of Bluetooth comes from the 1th century Danish king Harald Blatand－-translated into Harold Bluetooth. In the preparatory stage of trade associations, an expressive name is needed to name this high-tech. Industry organizers, after a night of discussion about the history of Europe and the infinite technological development in the future, some people think that it is most appropriate to name it after King Blatand. King Blatand unified Norway, Sweden and Denmark. Just like this upcoming technology, technology will be defined as allowing coordination between different industrial fields, such as computing, mobile phones and automobile industries. So the name was decided.

In Jelling, Denmark, there is a monument in the church. This monument was erected to commemorate the achievements of King Blatand and his father, the first king of Denmark, "Gorm the Old". Interestingly, this special stone was lost after a war between Harald and his son Sven Forkbeard. No one has seen this stone for nearly 6 years. Sven won (and exiled his father), because this stone engraved with ancient Nordic characters was the glory of Harald, so Sven buried it. It was not until recent years that a farmer became curious about this big mound on his farm and finally found this stone.

This logo was originally designed by Scandinavian Company when the business association was announced. The logo retains the traditional characteristics of its name, including the ancient Nordic letter "H", which looks very similar to an asterisk and a "B". You can see both on the logo carefully.

II. Introduction to Bluetooth Technology

Bluetooth was originally the name of the king who unified Denmark in the 1th century, but now it has the meaning of "unification", which is used to name the Bluetooth technology intended to unify the wireless LAN communication standard. Bluetooth technology is a wireless network technology jointly launched by Ericsson and IBM in 1998. Subsequently, the Bluetooth Technology Special Interest Group (SIG) was established to be responsible for the development of the technology and the formulation of the technical agreement. Today, more than 1,8 companies around the world have joined the organization, and recently Microsoft has officially joined and become one of the leading members of the SIG organization.

Bluetooth is an open standard for wireless data and voice transmission, which connects various communication devices, computers and their terminal devices, various digital data systems and even household appliances in a wireless way. Its transmission distance is 1 cm ~ 1 m, and it can reach 1m if the power is increased or some peripherals are added. It adopts 2.4GHz ISM frequency band, frequency modulation and frequency hopping technology, and uses directional error correction coding, ARQ, TDD and baseband protocols. TDMA is .625μs per time slot, and the baseband coincidence rate is 1mb/s. Bluetooth supports 64kb/s real-time voice transmission and data transmission. The voice coding is CVSD, the transmission power is 1mW, 2.5mW and 1mW respectively, and the globally unified 48-bit device identification code is used. Because Bluetooth uses wireless interface instead of wired cable connection, it has strong portability and is suitable for many occasions. In addition, this technology has low power consumption, little harm to human body, simple application and easy realization, so it is easy to popularize.

bluetooth technology

SIG organization launched version 1. of bluetooth technical specification on July 26th, 1999. The system structure of Bluetooth technology is divided into three parts: the bottom hardware module, the middle protocol layer and the high-level application. The bottom hardware includes radio frequency hopping (RF), baseband (BB) and link management (LM). The wireless frequency hopping layer filters and transmits the data bit stream through the 2.4GHz unauthorized ISM band microwave. This layer protocol mainly defines the conditions that the Bluetooth transceiver needs to meet in this band. Baseband is responsible for frequency hopping and transmission of Bluetooth data and information frames. Link management is responsible for connecting, establishing and dismantling links and carrying out security control.

Bluetooth technology combines the characteristics of circuit switching and packet switching, and can carry out asynchronous data communication, support up to three simultaneous synchronous voice channels, and use one channel to simultaneously transmit asynchronous data and synchronous voice. Each voice channel supports 64kb/ s synchronous voice link. Asynchronous channels can support a maximum rate of 72 at one end >: >

question 4: what is bluetooth? Why is it called Bluetooth? Bluetooth is a low-cost and 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. In the 1th century A.D., the northern European princes fought for hegemony, and the Danwei king stepped forward. With his unremitting efforts, the bloody war was stopped and all parties sat at the negotiating table. Through communication, the vassals made up their differences and became friends. Because the Danish king loves eating Lan Mei so much that his teeth are dyed blue, he is called the King of Bluetooth, so Bluetooth has become synonymous with communication. Today, 1 years later, when a new wireless communication standard was issued, people used Bluetooth to name it.

In 1995, Ericsson first proposed the concept of Bluetooth. Bluetooth profile works in microwave band, with a transmission rate of 1 megabyte per second and a maximum transmission distance of 1 meters, which can be reached by increasing the transmission power. Bluetooth technology is open all over the world, and it 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, camcorders, printers, fax machines, household appliances, etc., to realize wireless connection without dragging a tail (connecting cable). With the popularity of Bluetooth technology, home decoration is no longer worried about the wiring of electrical appliances; When using household appliances, you don't have to worry about a lot of remote controllers, but a mobile phone or a car key can do everything; When you are away from home, the company's work arrangements and pictures of relatives at home can be obtained anytime and anywhere; Punching in and paying fees don't have to wait in line, passing near the payment point, and can be easily completed without entering the door ... The wide application of Bluetooth technology will make our life extremely easy.

question 5: what does bluetooth mean? I. what is Bluetooth technology

the so-called bluetooth technology is actually a short-range radio 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, it is Bluetooth technology.

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Technology makes some modern mobile communication devices and computer devices that are easy to carry can be networked without cables, and can be wirelessly connected to the Internet. Its practical application scope can also be extended to various household appliances, consumer electronics products and information appliances such as automobiles to form one. "Bluetooth" technology belongs to a short-distance, low-cost wireless connection technology, and it is an open scheme that can realize wireless transmission of voice and data. Therefore, the "Bluetooth" of wireless communication has just emerged, but it has attracted close attention from the global communication industry and users.

Second, the origin of Bluetooth

Bluetooth was named after a Scandinavian king who unified Denmark and Sweden in the 1th century. It breeds a rather magical prospect: for mobile phones, there is no need to connect with headphones; In the personal computer, the host computer can get rid of the chaotic connection with the keyboard, monitor and printer; In a wider range, refrigerators, microwave ovens and other household appliances can be connected with computer networks to realize intelligent operation.

The Swedish telecommunications giant Ericsson invented Bluetooth technology. Because this technology has a very gratifying application prospect, in May 1998, five top communication/computer companies in the world, Ericsson, Nokia, Toshiba, IBM and Intel, jointly established the Bluetooth SIG after consultation, with the aim of accelerating its development, promotion and application. After the publication of this wireless communication technology, it quickly won the unanimous support of a large number of companies including Motorola, 3, Lucent, Compaq and Siemens. Up to now, more than 2, companies have joined Bluetooth SIG, including many of the world's most famous enterprises in the fields of computers, communications and consumer electronics, and even manufacturers and manufacturers of cars and cameras. An open technical specification can get such extensive attention and support from industry, which shows that products based on this Bluetooth technology will have broad application prospects and huge potential market. Bluetooth * * * The same interest group has now been renamed Bluetooth Promotion Group.

Third, the technical content of Bluetooth

Bluetooth technology products use low-energy radio communication technology to realize voice, data and video transmission, with the highest transmission rate of 1Mb/s per second, and full-duplex communication in time division, with a communication distance of about 1 meters. The communication distance can be further increased by configuring a power amplifier.

Bluetooth products adopt frequency hopping technology, which can resist signal fading; Adopting fast frequency hopping and short packet technology can effectively reduce co-frequency interference and improve communication security; Forward error correction coding technology is adopted to reduce the interference of random noise in long-distance communication; Adopt 2.4GHz ISM (industrial, scientific and medical) frequency band to save the trouble of applying for special license; Adopting FM modulation mode makes the equipment more simple and reliable; "Bluetooth" technology products send a synchronous packet at a hop frequency, and each packet occupies one time slot, which can also be increased to five time slots; Bluetooth technology supports an asynchronous data channel, or three simultaneous synchronous voice channels, or a channel that simultaneously transmits asynchronous data and synchronous voice. Each voice channel of "Bluetooth" supports synchronous voice at 64Kbps, and asynchronous channels support asymmetric connections with a maximum rate of 721Kbps and a reverse response rate of 57.6Kbps, or symmetric connections with a rate of 432.6Kbps.

The communication between Bluetooth technology products and the Internet enables home and office equipment to be interconnected without cables, which greatly improves the efficiency of office and communication. Therefore, "Bluetooth" will become the new favorite in the field of wireless communication, and will provide great convenience for users and be favored.

IV. Bluetooth technical indicators and system parameters

Currently published Bluetooth technical parameters ...... > >

Question 6: What do you mean by Bluetooth power amplifier? The power amplifier has a built-in Bluetooth wireless receiver, which can receive Bluetooth wireless signals from mobile phones, usually music signals. When in use, turn on the Bluetooth switch of the mobile phone, scan the nearby Bluetooth devices with the mobile phone, and connect with the Bluetooth power amplifier to make the music in the mobile phone emit loud sound through the power amplifier.

question 7: what does bluetooth mean? What's the role? Bluetooth is a low-cost and 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. In the 1th century A.D., 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 vassals made up their differences and became friends. Because the Danish king loves eating Lan Mei so much that his teeth are dyed blue, he is called the King of Bluetooth, so Bluetooth has become synonymous with communication. Today, 1 years later, when a new wireless communication standard was issued, people used Bluetooth to name it.

In 1995, Ericsson first proposed the concept of Bluetooth. Bluetooth profile works in microwave band, with a transmission rate of 1 megabyte per second and a maximum transmission distance of 1 meters, which can be reached by increasing the transmission power. Bluetooth technology is open all over the world, and it 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, camcorders, printers, fax machines, household appliances, etc., to realize wireless connection without dragging a tail (connecting cable). With the popularity of Bluetooth technology, home decoration is no longer worried about the wiring of electrical appliances; When using household appliances, you don't have to worry about a lot of remote controllers, but a mobile phone or a car key can do everything; When you are away from home, the company's work arrangements and pictures of relatives at home can be obtained anytime and anywhere; Punching in and paying fees can be done easily without queuing, passing near the payment point, and without entering the door ... The wide application of chicken tooth technology will make our life extremely easy.

Bluetooth connection between mobile phone and computer: (Take Sony Ericsson as an example)

First, correctly install and drive your Bluetooth adapter on the computer (I won't go into details here, please refer to the relevant materials for those who don't understand)

[Pairing]

Plug in the adapter to make it in the on state, and the Bluetooth sign in the taskbar should change from stopped red to turned on white.

enter the mobile phone menu-Connect-Bluetooth-Matching Device-Add Device, and then the mobile phone will start to search for the surrounding Bluetooth devices. You will find your Bluetooth adapter in a moment. Select the device you searched for and enter the identification code (just set it yourself, as long as you enter the same number on both sides, I usually enter four zeros for Sony Ericsson). After confirmation, the computer will prompt you to enter the identification code, and enter the last two.

[computer-> Mobile phone]

When sending things to the mobile phone, only files that can be recognized by the mobile phone can be sent to the mobile phone, such as pictures-jpg; Theme-thm; Audio -mid, amr；; JAV