Bluetooth

Bluetooth 2.1 + EDR4.0Bluetooth 2.1+EDRBluetooth 2.0Bluetooth 4.0Bluetooth 2.0 + EDRBluetooth 2.0+EDRBluetooth 4.2Bluetooth v2.1 + EDRBluetooth 2.1
Bluetooth is a wireless technology standard for exchanging data over short distances using short-wavelength UHF radio waves in the ISM band from 2.400 to 2.485GHz from fixed and mobile devices, and building personal area networks (PANs).wikipedia
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Wireless

wireless communicationwireless communicationswireless internet
Bluetooth is a wireless technology standard for exchanging data over short distances using short-wavelength UHF radio waves in the ISM band from 2.400 to 2.485GHz from fixed and mobile devices, and building personal area networks (PANs).
With radio waves distances can be short, such as a few meters for Bluetooth or as far as millions of kilometers for deep-space radio communications.

Ultra high frequency

UHFUHF bandUHF radio
Bluetooth is a wireless technology standard for exchanging data over short distances using short-wavelength UHF radio waves in the ISM band from 2.400 to 2.485GHz from fixed and mobile devices, and building personal area networks (PANs).
They are used for television broadcasting, cell phones, satellite communication including GPS, personal radio services including Wi-Fi and Bluetooth, walkie-talkies, cordless phones, and numerous other applications.

Bluetooth Special Interest Group

Bluetooth SIGassociate member of the Bluetooth Special Interest Group
Bluetooth is managed by the Bluetooth Special Interest Group (SIG), which has more than 30,000 member companies in the areas of telecommunication, computing, networking, and consumer electronics.
The Bluetooth Special Interest Group (Bluetooth SIG) is the standards organisation that oversees the development of Bluetooth standards and the licensing of the Bluetooth technologies and trademarks to manufacturers.

ISM band

ISM2.4 GHz13.56 MHz
Bluetooth is a wireless technology standard for exchanging data over short distances using short-wavelength UHF radio waves in the ISM band from 2.400 to 2.485GHz from fixed and mobile devices, and building personal area networks (PANs).
Cordless phones, Bluetooth devices, near field communication (NFC) devices, garage door openers, baby monitors and wireless computer networks (WiFi) all may use the ISM frequencies, although these low power emitters are not considered ISM.

Bluetooth Low Energy

BLELELow Energy
Bluetooth Low Energy uses 2MHz spacing, which accommodates 40 channels.
Compared to Classic Bluetooth, Bluetooth Low Energy is intended to provide considerably reduced power consumption and cost while maintaining a similar communication range.

Frequency-hopping spread spectrum

frequency hoppingFHSSfrequency-hopping
Bluetooth uses a radio technology called frequency-hopping spread spectrum.
Adaptive frequency-hopping spread spectrum (AFH), a specific type of FHSS, is used in Bluetooth wireless data transfer.

Frequency-shift keying

FSKfrequency shift keyingaudio frequency-shift keying
Originally, Gaussian frequency-shift keying (GFSK) modulation was the only modulation scheme available.
It is used by DECT, Bluetooth, Cypress WirelessUSB, Nordic Semiconductor, Texas Instruments LPRF, Z-Wave and Wavenis devices.

Personal area network

PANWPANwireless personal area network
Bluetooth is a wireless technology standard for exchanging data over short distances using short-wavelength UHF radio waves in the ISM band from 2.400 to 2.485GHz from fixed and mobile devices, and building personal area networks (PANs).
A wireless personal area network (WPAN) is a PAN carried over a low-powered, short-distance wireless network technology such as IrDA, Wireless USB, Bluetooth or ZigBee.

Scatternet

The Bluetooth Core Specification provides for the connection of two or more piconets to form a scatternet, in which certain devices simultaneously play the master role in one piconet and the slave role in another.
The terms "scatternet" and "piconet" are typically applied to Bluetooth wireless technology.

Harald Bluetooth

Harold BluetoothHaraldHarald I
The name Bluetooth is an Anglicised version of the Scandinavian Blåtand/Blåtann (Old Norse blátǫnn), the epithet of the tenth-century king Harald Bluetooth who united dissonant Danish tribes into a single kingdom.
The Bluetooth wireless specification design was named after the king in 1997, and the Bluetooth logo consists of a Younger futhark bindrune for his initials, H and B .

Jaap Haartsen

Invented by Dutch electrical engineer Jaap Haartsen, working for telecommunications company Ericsson in 1994.
Jacobus Cornelis Haartsen (born 13 February 1963, The Hague, Netherlands) is a Dutch electrical engineer, researcher, inventor and entrepreneur best known for his role in producing the specification for Bluetooth.

Headphones

headphoneearphoneearphones
Wireless streaming of audio to headphones with or without communication capabilities.
Headphones connect to a signal source such as an audio amplifier, radio, CD player, portable media player, mobile phone, video game console, or electronic musical instrument, either directly using a cord, or using wireless technology such as Bluetooth, DECT or FM radio.

Piconet

One master may communicate with up to seven slaves in a piconet.
A piconet is an ad hoc network that links a wireless user group of devices using Bluetooth technology protocols.

Handsfree

hands-freehands freebluetooth handsfree
Wireless control and communication between a mobile phone and a handsfree headset. This was one of the earliest applications to become popular.
Devices that are typically used for handsfree communication use Bluetooth as its wireless technology.

Headset (audio)

headsetheadsetswireless headset
Wireless control and communication between a mobile phone and a handsfree headset. This was one of the earliest applications to become popular.
Cordless bluetooth headsets are available and often used with mobile telephones.

Dongle

donglesadapterElectronic Key
While some desktop computers and most recent laptops come with a built-in Bluetooth radio, others require an external adapter, typically in the form of a small USB "dongle."
For example: WiFi adapters, Bluetooth adapters, and even USB "sticks" or "drives", are frequently referred to as dongles.

Johan Ullman

The development of the "short-link" radio technology, later named Bluetooth, was initiated in 1989 by Nils Rydbeck, CTO at Ericsson Mobile in Lund, Sweden and by Johan Ullman.
Handsfree / headset for mobile phones, both wireless and wired. This wireless headset, developed at the Ericsson Mobile lab in Lund, Sweden, gave birth to the Bluetooth technology according to two inventions, presented in 1989, and 1992.

Seventh generation of video game consoles

seventh generationSeventh generation eraseventh generation consoles
Seventh and eighth generation game consoles such as Nintendo's Wii, and Sony's PlayStation 3 use Bluetooth for their respective wireless controllers.

IEEE 802.11

802.11802.11b/g/n802.11b/g
Bluetooth and Wi-Fi (Wi-Fi is the brand name for products using IEEE 802.11 standards) have some similar applications: setting up networks, printing, or transferring files.
Because of this choice of frequency band, 802.11b/g/n equipment may occasionally suffer interference in the 2.4 GHz band from microwave ovens, cordless telephones, and Bluetooth devices etc. 802.11b and 802.11g control their interference and susceptibility to interference by using direct-sequence spread spectrum (DSSS) and orthogonal frequency-division multiplexing (OFDM) signaling methods, respectively.

Wi-Fi Direct

DirectDirect Wi-FiWiFi Direct network
Wi-Fi Direct was recently developed to add a more Bluetooth-like ad-hoc functionality to Wi-Fi.
The "pairing" of Wi-Fi Direct devices can be set up to require the proximity of a near field communication, a Bluetooth signal, or a button press on one or all the devices.

Bluetooth stack

BlueZApache Mynewt NimBLEAutomotive Bluetooth
Linux has two popular Bluetooth stacks, BlueZ and Affix.
Bluetooth stacks can be roughly divided into two distinct categories:

Wireless speaker

wireless speakersportable speakerspeaker
Wireless control of and communication with iOS and Android device phones, tablets and portable wireless speakers.
The two most popular RF frequencies that support audio transmission to wireless loudspeakers include a variation of WiFi IEEE 802.11, while others depend on Bluetooth to transmit audio data to the receiving speaker.

Bind rune

bindrunebind-runebindrunes
The Bluetooth logo is a bind rune merging the Younger Futhark runes (ᚼ, Hagall) and (ᛒ, Bjarkan), Harald's initials.
The Bluetooth logo merges the runes analogous to the modern Latin alphabet letters h and b; (Hagall) and (Berkanan) together, forming a bind rune. The two letters form the initials 'H B', alluding to the Danish king and viking raider Harald Bluetooth.

Digital Enhanced Cordless Telecommunications

DECT DECTDECT Forum
Allowing a DECT phone to ring and answer calls on behalf of a nearby mobile phone.
Like DECT, DECT ULE standard uses the 1.9 GHz band, and so suffers less interference than Zigbee, Bluetooth, or Wi-Fi from microwave ovens, which all operate in the unlicensed 2.4 GHz ISM band.

List of Bluetooth protocols

Bluetooth protocolfile transferACL
Host Controller Interface (HCI) operation with three-wire UART.
The wireless data exchange standard Bluetooth uses a variety of protocols.