In layman's terms, Bluetooth (bluetooth) is an open, low-cost, short-distance wireless communication connection technology used between various fixed and mobile digital hardware devices. The connection is stable and seamless, and its program is written on a 9 x 9 (mm) microchip that can be easily embedded in a variety of digital devices. The technology is not intended to be another wireless local area network (WLAN) technology; it is geared towards small-range connectivity between mobile devices, thus essentially saying that it is a technology that replaces cables. It can be used to replace a variety of current cable connectivity solutions over shorter distances, penetrate walls and other barriers, and enable flexible, secure, low-cost, low-power voice and data communications between a variety of digital devices over a unified, short-range wireless line.
From a professional perspective, Bluetooth is a wireless access technology. From a technical point of view, Bluetooth is an innovative technology, it brings the industry is a vibrant industry, so that Bluetooth is also an industry, which has been viewed by the industry as an important part of the entire mobile communications field. In fact, Bluetooth is not just a chip, but a network, the near future, the wireless personal network composed of Bluetooth will be ubiquitous.
Why do people call this technology "Bluetooth"?
This point can be said to have a story, the original, Bluetooth is a Danish ruler in the Middle Ages, "Harald Bluetooth" name, it is the king united Denmark and Norway, so that it became the northern part of Europe at the time of a united kingdom of influence. By naming the new technology "Bluetooth," the developers have demonstrated their ambition to unify the world's myriad of digital devices.
We can't help but wonder what the difference is between Bluetooth and WAP, both protocols that have been developed in the information industry in recent years.
Simply put, WAP technology is a global open standardized technology that uses small mobile communication devices to wirelessly connect to the Internet. Theoretically, the WAP protocol has been designed to override all kinds of digital mobile communications, meaning that it no longer has a gateway. Through WAP, mobile communication devices can interact with any Internet terminal device to deliver information. For more information, see the introduction to WAP.
So, from their different definitions and positioning, we can see that Bluetooth technology is actually a more advanced than WAP, more perfect and more suitable for the global exchange of information technology protocols, WAP is only limited to mobile communication devices (cell phones) and the Internet between the wireless connection, that is, the cell phone Internet technology; while the Bluetooth not only focus on the cell phone and the Internet, but also wants to establish All digitalized mobile devices (such as digital cameras, game consoles) and fixed hardware devices (such as computers) between the wireless connection. It can be said that the Bluetooth technology protocol has a much larger and broader range of applications.
And what is the difference between Bluetooth technology and WLAN (Wireless Local Area Network) technology?
From the common name of WLAN we can easily associate it with a Bluetooth alternative technology, from a technical point of view, these two wireless communication transmission technology are using the same IEEE 802.11 standard, and use the same carrier frequency band. In fact, their similarity is limited to the above aspects, the difference is: WLAN is only used for communication of the ordinary LAN protocol, and Bluetooth technology is not, because Bluetooth does not only mean LAN and WLAN technology has LAN communication and a large number of data transmission, it has more functions. And Bluetooth emphasizes multiple categories of mobile processing units.
We all know that infrared is also a wireless data transmission technology, and has been widely used in all aspects of our lives, so what is the difference between infrared transmission and Bluetooth technology?
First of all, from the stage of development, Bluetooth is still in the preliminary stage of research and development, and infrared has a history of 6 years, the application has been very broad, mature, the world's about 100 million units of equipment contains an infrared wireless transmission port; from the transmission distance and the requirements of view, the "Bluetooth" technology radio transceivers up to a distance of 10 meters, even if not in the same room. Even if the equipment is not in the same room can also form a mutual link, the maximum number of links can be up to seven. The infrared transmission distance is limited to 1 ~ 2m, but also must be directly aligned in the line of sight, there can not be any obstruction in the middle, it is at the same time only limited to between two devices, can not be linked at the same time more equipment; from the point of view of security, due to the omni-directional characteristics of the bluetooth, it can be any direction of the device eavesdropping. Therefore, Bluetooth provides authorization and security features in its Baseband protocol. Authorization makes use of a secret key (passphrase or PIN) that each device can authorize to other devices, after which the content is transmitted encrypted. Infrared wireless transmission, on the other hand, requires devices to be within line-of-sight, but eavesdropping is not impossible if the light is monitored and noise is filtered out. Infrared wireless transmission does not provide link-level security measures; it relies solely on the authorization and security features provided by the upper-layer protocol. See Bluetooth vs Infrared for more.