Bluetooth: technology and its application. How bluetooth works Smartphone what is bluetooth

Technical progress develops year after year, and each time it surprises us more and more. Man is ready to come up with all sorts of technologies to make our unusual world more practical, convenient and with greater opportunities.

Today we will talk about Bluetooth - a device that allows you to transmit data at a distance, using a special transmitter. Many people misunderstand why these functions are located on a mobile device?

What exactly is Bluetooth?

In this article you will get acquainted with the most reliable information about this device and its capabilities, and also understand how to use it.

And so, Bluetooth is a universal device with which everyone can transfer data (photos, documents, videos, music) over a distance. This development has already been used all over the world for 10 years. Today, this invention is a little forgotten. However, this does not mean that it has been written off. After all, almost every mobile phone has a transmitter that performs this function. In addition, Bluetooth influenced the creation of Wi-Fi and became its foundation. Therefore, speaking of Bluetooth, we can say that it is the progenitor of Wi-Fi. But it should be noted that even with the advent of wireless devices, Bluetooth is very popular among young people and in modern offices.

What is it used for?

Firstly, Bluetooth is an excellent way to keep your workplace tidy and save space. Today, this is precisely the definition often used by modern experts. After all, if we go back a little, the product we call was invented to do without wires, which only interfered with work and comfort. In addition, if even one wire breaks, the entire production could stop. But if the connection is wireless, then the breakdown is not dangerous and is minimized. However, this fact is not the main advantage of Bluetooth.

Its main purpose is to transfer data (photos, documents, videos, music) from one mobile device to another. We often don’t think about the great potential of this device, and when asked about the purpose of Bluetooth in a mobile phone, we answer, “It’s a means to transfer files.” This interpretation is correct, but does not fully reveal the essence of the product. After all, with the help of Bluetooth, you can find other useful applications.

How does this device work? It turns out that there can be no difficulties here, since in order to transmit data, only confirmations and choices are needed. For example, you decide to give someone a photo. For this, both he and you must have Bluetooth. Next, launch this application, then look for your friend’s device and turn on the connection. Once everything is confirmed, you will be able to share files. This scheme is standard.

Currently, there is a large variety of peripheral devices available. Not all of them require confirmation. To make it easier for users to use and eliminate a lot of cables, all kinds of peripheral devices can work in standalone mode.
The Bluetooth application allows data to be sent and received by different elements. To carry out its operation, radio waves are needed, calculated within a radius of a limited exposure distance.

With a Bluetooth peripheral, you can transfer all sorts of data or use an always-on connection wirelessly. There are also some little things in the device that may not seem entirely suitable. But the Bluetooth system has a huge number of various developments. It is not a fact that Wi-Fi is gradually relegating outdated developments to the background, but this does not mean that they have ceased to be used. For example, there is a lot of Hi-Fi that uses this connection method: speakers for computers, headsets for phones, printers, adapters, cameras, TVs, and so on.

I would like to consider the most popular connections.

Many have heard about the Bluetooth adapter, and for some it is not surprising that this device is a real router, not transmitting data via the Internet, but connecting it with wireless devices. You might think that this is a Wi-Fi router that creates an access point. As for our case, this point is a kind of server that supports connections of technical devices. For example, in an office there is one printer and several computers. To allow people not to jostle, you need to install an adapter and connect all computers to the printer. In this case, the print queue will be normalized and everyone will be able to pick up their documents.

A Bluetooth headset is a regular phone headset that does not have wires. Thanks to this unique technology, the user can answer calls without using the phone and without being distracted from basic matters. The headset is attached to the ear and can be used for a long time. The presented technology does not interfere with normal hearing; it does not require a special button to answer phone calls. Until recently, we only saw this in films. Today this is no longer fiction and ordinary people use this device.

The Bluetooth radio module is a regular computer speaker without wires and is used to transmit a stream of audio information. In order for the speaker to work, you need to connect to the server so that sound can be transmitted. It can be a phone, computer or player. Then you should turn off the sound on the device and enjoy your favorite music, the quality of which will be higher.

From the above, you learned what a Bluetooth device is. By creating these technologies, the developers have greatly simplified our everyday life and the need to have a lot of wires. It is necessary to remember the main conditions that Bluetooth can be used in a certain area and the area of ​​influence is different for each device. In addition, some devices will need to be recharged.

Bluetooth ensures the exchange of information between devices such as personal computers (desktop, pocket, laptops), mobile phones, printers, digital cameras, mice, keyboards, joysticks, headphones, headsets on a reliable, free, universally available radio frequency for short-range communication.

Bluetooth allows these devices to communicate when they are within a radius of up to 100 meters from each other (range varies greatly depending on obstacles and interference), even in different rooms.

Name and logo

The word Bluetooth is the English translation of the Danish word "Blåtand" ("Blue-toothed"). This nickname was worn by King Harald I, who ruled Denmark and part of Norway in the 10th century and united the warring Danish tribes into a single kingdom. The implication is that Bluetooth does the same with communication protocols, combining them into one universal standard. Although "blå" means "blue" in modern Scandinavian languages, in Viking times it could also mean "black in color." Thus, it would be historically correct to translate the Danish Harald Blåtand as Harald Blacktooth rather than Harald Bluetooth.

Bluetooth logo is a combination of two Nordic (“Scandinavian”) runes: “Hagall” - an analogue of the Latin H and “Berkanan” - the Latin B. The logo is similar to the older logo for Beauknit Textiles, a division of the Beauknit Corporation. It uses a fusion of reflected K and B for "Beauknit" and is wider and has rounded corners, but is basically the same.
History of creation and development

Bluetooth Specification was developed by the Bluetooth Special Interest Group (Bluetooth SIG), which was founded in 1998. It included Ericsson, IBM, Intel, Toshiba and Nokia. Subsequently, the Bluetooth SIG and the IEEE reached an agreement whereby the Bluetooth specification became part of the IEEE 802.15.1 standard (published June 14, 2002). Ericsson Mobile Communication began work on creating Bluetooth in 1994. Initially, this technology was tailored to the needs of the FLYWAY system for a functional interface between travelers and the system.

How Bluetooth works

The operating principle is based on the use of radio waves. Bluetooth radio communication is carried out in the ISM band (Industry, Science and Medicine), which is used in various household appliances and wireless networks (licensing-free range 2.4-2.4835 GHz). Bluetooth uses Frequency Hopping Spread Spectrum (FHSS). The FHSS method is easy to implement, provides immunity to broadband interference, and the equipment is inexpensive.

According to the FHSS algorithm, in Bluetooth the carrier frequency of the signal changes abruptly 1600 times per second (in total, 79 operating frequencies with a width of 1 MHz are allocated, and in Japan, France and Spain the band already has 23 frequency channels). The sequence of switching between frequencies for each connection is pseudo-random and is known only to the transmitter and receiver, which synchronously switch from one carrier frequency to another every 625 μs (one time slot). Thus, if several receiver-transmitter pairs operate nearby, they do not interfere with each other. This algorithm is also an integral part of the system for protecting the confidentiality of transmitted information: the transition occurs according to a pseudo-random algorithm and is determined separately for each connection. When transmitting digital data and audio (64 kbit/s in both directions), different encoding schemes are used: the audio signal is not repeated (as a rule), and digital data will be retransmitted if a packet of information is lost.

Specifications

Bluetooth 1.0

Device versions 1.0 (1998) and 1.0B had poor compatibility between products from different manufacturers. In 1.0 and 1.0B, it was mandatory to transmit the device address (BD_ADDR) at the handshake stage, which made it impossible to implement connection anonymity at the protocol level and was the main drawback of this specification.

Bluetooth 1.1

Bluetooth 1.1 fixed many bugs found in 1.0B, added support for unencrypted channels, and received signal strength indication (RSSI).

Bluetooth 1.2

Version 1.2 added adaptive frequency hopping (AFH) technology, which improves immunity to electromagnetic interference (interference) by using staggered frequencies in the tuning sequence. The transmission speed also increased and eSCO technology was added, which improved the quality of voice transmission by repeating damaged packets. HCI has added support for a three-wire UART interface.

Major improvements include the following:
Fast connection and discovery.
Adaptive frequency hopping with spread spectrum (AFH), which improves immunity to radio interference.
Higher data transfer rates than in 1.1, almost up to 721 kbit/s.
Enhanced Synchronous Coupling (eSCO), which improves the voice quality of an audio stream by allowing damaged packets to be retransmitted, and can optionally increase audio latency to better support parallel data transfers.
Support for a three-wire UART interface has been added to the Host Controller Interface (HCI).
Approved as IEEE Standard 802.15.1-2005.
Flow Control and Retransmission Modes have been introduced for L2CAP.

Bluetooth 2.0+EDR

Bluetooth version 2.0 was released on November 10, 2004. It is backward compatible with previous 1.x versions. The main innovation is support for Enhanced Data Rate (EDR) to speed up data transfer. The nominal speed of EDR is about 3 Mbit/s, but in practice this allowed increasing the data transfer rate only to 2.1 Mbit/s. Additional performance is achieved using various radio technologies for data transmission.

The standard (base) data rate uses GFSK modulation of the radio signal at a transmission rate of 1 Mbit/s. EDR uses a combination of GFSK and PSK modulations with two options, π/4-DQPSK and 8DPSK. They have high data transfer rates over the air - 2 and 3 Mbit/s, respectively.

The Bluetooth SIG has published the specification as "Bluetooth 2.0 + EDR Technology", which implies that EDR is an optional feature. In addition to EDR, there are other minor improvements to the 2.0 specification, and products may comply with "Bluetooth 2.0 Technology" without supporting higher data rates. At least one commercial device, the HTC TyTN Pocket PC, uses "Bluetooth 2.0 without EDR" in its technical specifications.

According to the 2.0+EDR specification, EDR provides the following benefits:
Increase the transfer speed by 3 times (2.1 Mbps) in some cases.
Reduced complexity of multiple simultaneous connections due to additional bandwidth.
Lower energy consumption due to load reduction.

Bluetooth 2.1

2007 Added technology for advanced request for device characteristics (for additional filtering of the list when pairing), energy-saving technology Sniff Subrating, which allows you to increase the operating time of the device on a single battery charge by 3-10 times. In addition, the updated specification significantly simplifies and speeds up the establishment of communication between two devices, allows updating the encryption key without breaking the connection, and also makes these connections more secure thanks to the use of Near Field Communication technology.

Bluetooth 2.1+EDR

In August 2008, Bluetooth SIG introduced version 2.1+EDR. The new Bluetooth edition reduces energy consumption by 5 times, increases the level of data security and makes it easier to recognize and connect Bluetooth devices by reducing the number of steps it takes.

Bluetooth 3.0+HS

3.0+HS was adopted by the Bluetooth SIG on April 21, 2009. It supports theoretical data transfer rates of up to 24 Mbps. Its main feature is the addition of AMP (Asymmetric Multiprocessing) (alternatively MAC/PHY), an addition to 802.11 as a high-speed message. Two technologies were provided for AMP: 802.11 and UWB, but UWB is not in the specification.

Modules supporting the new specification combine two radio systems: the first provides data transmission at 3 Mbit/s (standard for Bluetooth 2.0) and has low power consumption; the second is compatible with the 802.11 standard and provides the ability to transfer data at speeds of up to 24 Mbit/s (comparable to the speed of Wi-Fi networks). The choice of radio system for data transmission depends on the size of the transmitted file. Small files are transferred over a slow channel, while large files are transferred over a high-speed channel. Bluetooth 3.0 uses the more generic 802.11 standard (without a suffix), meaning it is not compatible with Wi-Fi specifications such as 802.11b/g or 802.11n.

Bluetooth 4.0

The Bluetooth SIG approved the Bluetooth 4.0 specification on June 30, 2010. Bluetooth 4.0 includes Classic Bluetooth, High Speed ​​Bluetooth, and Bluetooth Low Energy protocols. High Speed ​​Bluetooth is based on Wi-Fi, while Classic Bluetooth consists of protocols from previous Bluetooth specifications.

The Bluetooth Low Energy protocol is intended primarily for miniature electronic sensors (used in sports shoes, exercise equipment, miniature sensors placed on the body of patients, etc.). Low power consumption is achieved through the use of a special operating algorithm. The transmitter is turned on only while sending data, which makes it possible to operate on a single CR2032 battery for several years. The standard provides a data transfer rate of 1 Mbit/s with a data packet size of 8-27 bytes. Two Bluetooth devices will be able to establish a connection in less than 5 milliseconds and maintain it at a distance of up to 100 m. Advanced error correction is used for this, and the necessary level of security is provided by 128-bit AES encryption.

Sensors for temperature, pressure, humidity, speed of movement, etc. based on this standard can transmit information to various control devices: mobile phones, PDAs, PCs, etc.

The first chip supporting Bluetooth 3.0 and Bluetooth 4.0 was released by ST-Ericsson at the end of 2009.

Bluetooth 4.0 is supported on MacBook Air and Mac mini (since July 2011), iMac (November 2012), iPhone 4S (October 2011) and iPhone 5 (September 2012), iPad 3 (March 2012), LG Optimus smartphones 4X HD (February 2012), HTC One X, S, V and Samsung Galaxy S III (May 2012), Explay Infinity (August 2012), HTC One X+ (2012), HTC Desire C, Google Nexus 7 (2012) ), Sony VAIO SVE1511N1RSI.

Hello everyone, dear users of the best mobile portal Trashbox. Today is September 1, the official day of knowledge, and in the meantime I continue my interesting column “How it works.” Before I start, I would like to congratulate all the students on their day - good luck in your studies and don’t dare miss out - you will regret it. Today I want to talk about Bluetooth, one of the most popular wireless interfaces. Let's find out what Bluetooth is and how it works. The most interesting under the cut.

Bluetooth (translated as “blue tooth” or popularly “blue tooth”) is one of the wireless network technologies that ensure the exchange of information between various devices, including personal computers, laptops, mobile phones, printers, cameras and other similar products. Bluetooth allows devices to communicate - the maximum range is 100 meters from each other.

The main objective of Bluetooth technology is to transfer data between devices wirelessly - providing economical and cheap radio communication between various types of electronic devices.
The operating principle is based on the use of radio waves, and Bluetooth technology itself is a small chip that is a high-frequency transceiver. It operates in the ISM (Industry, Science and Medicine) band, as these frequencies do not require a license to use - they are free for use worldwide (exceptions: France and Spain).

The fundamental principle of building Bluetooth-based networks is the Frequency Hopping Spread Spectrum (FHSS) method. The FHSS method is easy to implement - it provides immunity to broadband interference, and the equipment is inexpensive.

The transmitter breaks the data into packets and transmits them using a pseudo-random algorithm, in which the carrier frequency (pattern) changes 1600 times per second and takes the value of one of 79 subfrequencies. The sequence of switching between frequencies for each connection is pseudo-random and is known only to the transmitter and receiver.

Several devices connected using Bluetooth form a so-called piconet - a collection of two to eight devices operating on the same template. In a piconet, one of the devices is the master and the other is the slave. Bluetooth technology can support several slave devices - up to a maximum of seven. The master is the user device that initiates the communication. It also controls the operation of devices in the piconet.

Bluetooth allows the transmission of both voice and data. Voice is transmitted over three audio channels at a speed of 64 Kbps each. Data transfer rates are approximately 720 Kbps in asymmetric mode and 420 Kbps in fully symmetrical or full duplex (two-way) mode. The “blue tooth” can work over relatively short distances. According to the specifications (versions 1.1 and 1.2), it has two classes of adapters: Class 1 (Class A) supports up to 100 meters, and Class 2 (Class B) works within 10 meters (still the most common class among the specifications) .

Currently, the newest Bluetooth specification is 4.0. The Bluetooth SIG approved the specification on June 30, 2010. The Bluetooth low energy protocol supports the transmission of data such as sensors of temperature, pressure, humidity, speed of movement and others based on this standard can transmit information to various devices: mobile phones, personal computers, smartphones and other similar mobile products.

Bluetooth technology can also be used in a wide variety of areas of mobile life. You can use it for the following purposes without any difficulty:

• For automatic synchronization between devices. For example, as soon as you enter new data into the address book on your laptop, the corresponding entries on your desktop computer are automatically modified, and vice versa
• For automatic backup synchronization. An example would be this situation: the manager changed your action plan while you are on vacation. The office PC sends changes to your mobile device, which automatically connects to the laptop and transmits the modified schedule
• To use a laptop PC as a speakerphone. By connecting the wireless headset to your laptop, you can use it in the office, car or home
• To connect all participants in the exchange of information. While at any business event, you can quickly discuss an issue of interest with all its participants. In addition, you can perform control functions remotely. For example, turn on the projector
• To transmit various multimedia content from anywhere. The camera connects to your phone (wirelessly) and you add comments using the keyboard on your phone or laptop. Photos and text are sent to the recipient

All of the above is just the smallest part where Bluetooth wireless technology can be used. Now such exotic options are already appearing, such as embedding modules running on this technology into printers, memory cards and various other devices.

In the near future, Bluetooth technology, in addition to mobile phones, smartphones, and other interconnected devices, will even be built into household appliances. Just imagine it: a TV, vacuum cleaner, refrigerator, microwave oven and other home appliances can be controlled using a smartphone - just like with a universal control panel. In addition, alternative solutions are currently being developed that should seriously compete with the so-called “blue tooth” and even possibly surpass this technology.

A modern person is surrounded by an incredible number of mobile and electronic devices, and therefore he must be aware of the latest news of new technologies and know well what the basic concepts and terms of communication means. One of the most common technologies for building communication networks in the world is Bluetooth (bluetooth, bluetooth) - function wireless communication, without which in our time it is no longer possible to do.

Today, all models of mobile devices are equipped with wireless technology Bluetooth, and its latest version Bluetooth 4.0 is built into all flagship mobile devices from Samsung and Apple. The fourth version of Bluetooth is the most advanced; it allows you to wirelessly transfer data from one smartphone or tablet to another at speeds of up to one megabit per second at a distance of 100 meters.

Bluetooth technology is designed to enable data transmission not only between similar devices, for example between two smartphones, but also between devices of different types. For example, computer and mobile phone. Thanks to Bluetooth, a wireless connection is created, with which you can transfer any information, including photos, video and audio files from one medium to another. Bluetooth is also used to connect a controlled device to a controller or signal transmission, allowing you to use headphones wirelessly.

Translated from English, the word "Bluetooth" means "blue tooth". It was not by chance that wireless communication technology was named this way. Bluetooth is the nickname of the Danish Viking king Harald Bluetooth, who lived in the 900s and is famous for uniting Norway and Denmark. He got his nickname as the Viking king because of his front tooth, which was darkened. When choosing a name, the developers of Bluetooth technology apparently decided that, by analogy with the king-unifier of the lands, it would unite computers, mobile phones, tablets and other telecommunications devices with each other.

The operating principle of Bluetooth technology is based on the use of radio communication in the ISM range, which is free from the need for licensing and does not require large investments to purchase equipment. The level of resistance and privacy when using Bluetooth is high, since data transmission occurs according to a pseudo-random algorithm and the frequency switching sequence is known only to the devices themselves.

The latest models of all mobile phones, tablets and laptops are equipped with Bluetooth, the presence of which is indicated by a logo icon in the case or on the screen of the mobile device. When a Bluetooth connection is established, a corresponding icon appears on the screen, and when exchanging data, an additional indication appears.

In addition to mobile devices, bluetooth technology used in desktop computers to provide communication between cameras, mice, keyboards, printers, scanners, headsets and headphones. All this equipment can communicate at a distance of up to 100 meters with Bluetooth adapters with flash drives, which can be found on sale today in any hardware store. Sometimes wireless communication is supported even between devices located in different rooms.

To connect various devices to a personal computer via Bluetooth, you need to install a Bluetooth connector port on the computer, which in shape looks like a simple flash drive and connects via USB. The program and drivers for working with Bluetooth are usually included in the kit; if they are not, you must use a universal program for working with BlueSoleil devices.

When establishing a connection between two devices, one of them is the master and the other is the slave. On both devices you need to turn on Bluetooth and continue scanning bluetooth wireless network. The list of available devices is displayed on the mobile phone screen and in the program on the computer. The device name can be set. To connect via Bluetooth, you need to know the name of the device you want to connect to and find it in the list. Then a password is entered on one of the devices, and on the second, this password must be confirmed. After this, the connection is established and data can be exchanged between the devices that have become paired. The Bluetooth port connected to the computer is usually equipped with a light indicator; when there is a connection and data transfer, it lights up and flashes blue or green.

Deserves special attention bluetooth headphones, which allow while driving, playing sports and walking. A wireless Bluetooth headset is attached to the ear, and the phone itself can be in a pocket or bag at this time. The headset has a button that is used to answer and allows you to adjust the volume. Call quality in use bluetooth headphones high, and the low power of the Bluetooth signal eliminates the harmful effects of mobile communications on health.

Using Bluetooth, you can exchange information between electronic multimedia devices: computers, mobile phones, etc. Bluetooth allows them to communicate on the inexpensive, widely available 2.45 GHz frequency. The established connection is reliable if the gadgets are located at a distance of up to 100 m.

Bluetooth is a wireless radio technology. It is designed to combine various digital devices. Bluetooth 4.0 version is energy saving and compatible with previous ones. This technology allows you to increase the operating time of the device after a full battery charge by more than five times. In addition, the data exchange speed and connection stability have increased. The latest version 4.1 has a number of improvements regarding communication with mobile devices.

Bluetooth technology uses short-range transmitters. There are two types: built directly into the device, external - connected via a PC card or USB port. It differs from IrDA (infrared port) in its larger range and high speed of information transfer. For Bluetooth there is no need for line of sight to the receiver. High speed IrDA devices were not widely available. They have been replaced by modern ones - Bluetooth, WiFi.

No cables are required to connect Bluetooth devices and transmit multimedia information. Both devices must have a built-in Bluetooth adapter. When it is activated, each device begins searching for another one within the acceptable range of the signal. Currently, the radius has increased from 10 m to 100 m (in an apartment 30-40 m). This is associated with the emergence of a large number of peripheral Bluetooth devices that work without bulky, inconvenient wires: keyboards, mice, headphones, modems.

The Bluetooth frequency range of 2.45 GHz is universally accessible to everyone. The Federal Communications Commission limits the range used by devices. The problem is that there are so many of them: bluetooth, wireless networks, microwave ovens. Audio and video equipment operating in the Home RF range is even more common. Increasing the Home RF range will cause conflict between the two.

Every user who wants to take advantage of wireless technology must make sure that there is a Bluetooth microchip in the device, otherwise it must be purchased and installed. On a computer, the adapter is connected to a USB port. The system itself will automatically detect a new device within range. Typically no driver installation is required. If the operating system indicates the adapter as an unknown device, then install the driver from the disk included in the kit.

After the driver installation is complete, you need to activate Bluetooth to start searching for other devices. The adapter must be active on both devices. If the scan result is positive, a list of available devices is displayed. Find what you need, pair and start transferring data.

Despite the widespread use of technology, not everyone knows how to use Bluetooth on Android. However, this is an important topic because thanks to this type of communication, users can connect a wireless headset, transfer files between devices, play music on their home speaker system, and so on.

It is worth noting that using a Bluetooth connection, the phone can be used as a wireless modem. How to use all this? Everything is very simple.

How to turn on Bluetooth

As you already understood, before moving on to the functions, you should turn on the wireless adapter. This can be done through the control panel in the drop-down menu.

How to use Bluetooth on Android: Video

But, since we are interested in the settings and functions of this connection, it is best to go to the device settings. To do this, go to the menu and find the “Settings” shortcut, which in the vast majority of cases looks like a gear.

Here find the “Bluetooth” item. If this is not the case, then first open “Wireless Networks”, and then “Bluetooth”. Here we check the box or move the slider to the “On” position to turn on the module.

In order to search for equipment available for connection, click the “Search” button. Depending on your phone model, it may be located at the bottom of the screen or above the list of connections. This is the answer to the question of how to update Bluetooth on devices with Android OS.

There are no complicated settings here. Users can only turn discovery on or off. Also in the parameters you can break existing connections. You can also rename any connection. If you are connected to a headset or home speaker system, you can set the connection type:

• Telephone (use for sound on telephone).
• Media (use to transmit sound).
• Control device.
• Internet access and so on.

These modes allow you to control other devices remotely, stream audio content, and perform other functions, depending on your choice and the capabilities of the connected equipment.

The first is used to connect a headset, the second to play music from your phone on home speakers or a car stereo, the third allows you to control the media player remotely, and the fourth provides access to the mobile Internet. In other words, in the first case, audio is transmitted from the speaker and received from the microphone, and in the second, only audio is transmitted from the music player, and so on.

How to change the Bluetooth name on an Android smartphone

Many people are concerned about the question of how to rename Bluetooth on Android. The thing is, things aren't always that simple. For example, on some phones this is done in the “Bluetooth” parameters. There is a special item “Device name” here. However, on newer versions of Android this cannot be done, since there is no such item in the adapter settings. The module uses the phone name.

Of course, it can be changed, the main thing is to find where it is done. If you are using Android 4.2 and higher, then open “Settings” and go to the “Options” tab.

Scroll to the bottom of the page and select “About device”. Here, find "Device Name". Enter any name and click "OK". In the future, it will be displayed when connected via Bluetooth.

Translated from Danish into English, Bluetooth means “blue-toothed”. This was the name of the Danish king Harold I for his peculiarity - a dark front tooth. This king also became famous for being able to unite several warring Danish tribes. Bluetooth also has the ability to unite, not tribes, but communication protocols into one universal standard. The development of Bluetooth technology belongs to the Ericsson company; to implement this idea, in 1999 an association of well-known world brands Toshiba, Sony, IBM, Intel, Nokia and many others was created under one name SIG (Bluetooth Special Interest Group).

Using radio waves in the ISM range (2.4-2.48 GHz - a range not subject to licensing) Bluetooth designed to provide wireless communication between devices such as: cell phones, printers, computers, digital cameras, headphones, cameras and so on. The transmit signal is called Frequency Hopping Spread Spectrum (FHSS) and is a broadband signal. In Bluetooth, using the frequency hopping method, the frequency of the FHSS carrier signal changes abruptly 1600 times per second, 79 operating frequencies are used for this purpose. For each connection, the frequency changes in a pseudo-random manner.

According to these changes, every 625 μs they synchronously move from one frequency to another. This sequence of changes connects several receiver-transmitter pairs without blocking the operation of other connection pairs. The peculiarity of signal transmission is that the transmitted information remains confidential. Digital data and audio signals are encoded differently: the audio signal is usually not repeated, and digital data is retransmitted if lost. With the help of such signals, devices can transmit information to each other at a distance of 10 - 100 meters, even when located in different rooms.

For many people, such devices seem complicated and unnecessary. We are accustomed to a more familiar connection using a cable. It is Bluetooth technology that opens up information connections between various devices in a completely new way. Bluetooth devices are essential in modern life and are used for work, leisure and entertainment. Bluetooth devices include headsets, car kits, speakers and others. One of the most popular devices is bluetooth headset, designed for speakerphone. Bluetooth for phones also allows you to talk on the phone without holding it in your hands.

Usually we take Bluetooth for a laptop for granted, but whether the Bluetooth function is installed or the Bluetooth settings for the computer are lost - this can be easily checked through the “device manager”, Bluetooth will be listed in the network adapters, but if it is not there - download bluetooth and installing it will not be particularly difficult. Bluetooth equipment is characterized by reliability, resistance to broadband interference, cost-effectiveness, and low power and energy consumption.

Most Bluetooth devices have a separate USB interface and an internal antenna. Such devices can interact with both personal computers and laptops. They are considered universal, but there is also a category of devices that are intended for installation inside computers. They are made in the form of boards located in the slots of computer motherboards (reminiscent of USB flash drives). Thanks to the sensitivity of the external antenna, the range of Bluetooth devices can be extended up to 200 meters.

Many people believe that Wi-Fi and Bluetooth are the same thing, but this is a deep misconception. Bluetooth was created to transfer data between two devices with a range of up to 100 meters, it works according to its standards Bluetooth 1.0 and Bluetooth 2.0 and others, it is also very easy to use, using Bluetooth you can only create a personal network PAN. WiFi- this is also a wireless communication standard, the range of which can reach 300 meters, Wi-Fi operates in accordance with 802.11 b/g/n/ standards with the mandatory use of an adapter (router) for communication, creates a wireless local network WLAN, in which several various devices.

The presence of Bluetooth technology allows for interactive conferences, Internet bridges, automatic data synchronization between different digital devices, allows you to enjoy a cable-free desktop, and also solves various network problems at home and in the office. Bluetooth in a laptop will please its owner when traveling or on business trips. To buy Bluetooth, you should definitely consult with the seller and clarify the specific features of this type of technology.

Bluetooth technology is effectively spreading in the global market for the latest technologies. Bluetooth headsets for mobile phones, laptops, printers, keyboards, and mice are being actively produced. The Bluetooth standard development company is focused on improving Bluetooth wireless communications and bringing new Bluetooth profiles to life.

How to install and configure bluetooth
The most difficult thing is to install and configure the Bluetooth connection, after which you will no longer need to think about how to use Bluetooth - the computer will automatically detect all Bluetooth devices within range and will not require user intervention.
1. Insert the Bluetooth adapter into the computer USB connector (where the flash drive is usually inserted).

2. If the device is not detected automatically, then to install Bluetooth on your computer you need to use a disk with drivers (software (supplied with the Bluetooth device)). We insert the disk into the drive in the center of the ejected disk receiver, not paying attention to the fact that the disk is small.

3. Select the installation language. In our case, Russian.

(Picture 1)

3.1. We are waiting for the Installation Wizard to complete the necessary preparations. Click “Next”.
3.2. We accept the terms of the License Agreement.

(Figure 2)

3.3. We choose whether we need a shortcut on the desktop and automatic launch of the program when the OS boots, or just click “Next”.
3.4. We decide on the installation location of the program. If you do not want to install on drive C, then click the “Change” button and specify another folder on another drive.

(Figure 3)

3.5. Let's start installing the driver.
3.6. We wait while the program installs its components.
3.7. Remove the CD from the drive.

4. If the device is detected automatically, then find the bluetooth icon in the tray above the clock and right-click on it and select “Accept file” in the context menu.
If you installed the drivers yourself, then you need to open the program on your computer by double-clicking on the “Bluetooth” icon on the desktop.
After opening the program menu, you need to select the detection mode - in this mode, the computer will search for all available Bluetooth devices within the signal range.
After the computer detects a signal from an external device, you should confirm the request to establish communication between the devices, and that’s it - your bluetooth is working!

How to download a file from your phone to your computer
Files from your phone to your computer are usually transferred repeatedly, so it will be more convenient to set up a standard connection for your phone from the very beginning.
1. Activate bluetooth in your phone, and launch a special connection wizard on your computer by selecting “Connect a Bluetooth device” in the program menu. The wizard will scan all available bluetooth devices and show a list of them.
2. Double-click on the phone icon and go to the service selection window.
3. Among all the listed options for transferring files, the FTP server option is best suited, next to which you should check the box.
4. Click the “Next” button.
5. To complete the creation of a standard connection, in the window that opens, click the “Finish” button.

By opening the Bluetooth Environment window, you can see a shortcut for the created connection. To connect your phone to your computer, you just need to double-click on this shortcut and enter the PIN code if the “secure connection” function is activated on your phone. After performing the above manipulations, all files from the phone will be displayed on the computer screen in the usual form of the folder and its contents. You can perform all standard operations with these files, including copying to your computer’s hard drive.

How to transfer a file via bluetooth
We connect the Bluetooth adapter to a free USB connector.
1. After a few seconds, the main program window will appear on the desktop (you can call it using a shortcut on the desktop or in the Start/Programs menu).

(Figure 4)
The red ball in the center is a computer to which a USB adapter is connected. The icons at the top show which devices it can work with and what functions it can perform. Let's try to establish a connection with a mobile phone (attention: the mobile phone must support a connection via Bluetooth and it must be turned on!).

2. Click once on the red ball. Using this command, the program will search for devices.

3. In our case, the program found one new device - a mobile phone.
Now double-click on the phone image. This will allow us to determine the available services. In this case, the icons with their designations will be highlighted with frames.

Search for devices that support Bluetooth transmission - phone found

(Figure 5)

Let's try to establish a connection. To do this, click “File Transfer” once. The program will prompt you to enter a confirmation code. These can be any combination of numbers, but they must be the same on both the computer and the phone (for example, 123. Or 55).

(Figure 6)

If you have many devices saved in your phone's memory, you can send your computer's business card by clicking on the "Send Objects" icon. This will allow you to clarify the computer name.

Problems?
... If the computer does not see the bluetooth device.
1. Check whether the Bluetooth function is activated in the device. If not, activate it.
2. Restart your computer and bluetooth device.
3. Reinstall Bluetooth drivers on your computer.
...Does my computer have bluetooth?
Built-in blue tooth modules are only found in new devices; most models do not have them. To check whether your computer contains a Bluetooth module, click the “Start” button, select “Control Panel” and find the “bluetooth” icon in the window that opens. If it is not there, such a module is not installed in the computer, but you can use a Bluetooth adapter.
... How to choose bluetooth
When choosing, you should pay attention to the technical characteristics - the data transfer speed should be at least 50-60 Kbps, the range of action should be class 1 (up to 100 m in an open space, and in an apartment - up to 30-40 m). A mini-format adapter is quite convenient - it allows you to use closely spaced USB connectors.

So, you can see for yourself that using bluetooth is very simple. To do this, it is quite enough to have minimal skills in handling a mobile phone and an initial user level of working with a PC.