Bluetooth (Bluetooth) is by Toshiba, Ericsson, IBM, Intel and Nokia in May 1998 **** with the proposed close-range wireless data communication technology standards. It can realize single-point-to-multipoint wireless data and sound transmission within a 10-meter radius, with a data transmission bandwidth of up to 1 Mbps. The communication medium is an electromagnetic wave with a frequency between 2.402 GHz and 2.480 GHz.
Bluetooth communication technology features
■Bluetooth work in the global open 2.4GHz ISM (i.e., industrial, scientific, medical) band;
■Using frequency-hopping spectrum expansion technology, the frequency band is divided into a number of frequency-hopping channels (hop channel), in a connection, the radio transceiver according to a certain code sequence constantly from a channel "hop" from one channel to another in a certain code sequence;
■A Bluetooth device can establish a connection with seven other Bluetooth devices at the same time;
■Data transfer rate of up to 1Mbit/s;
■Low-power consumption, communication security is good;
■Can be over the obstacles within the effective range of the Connection, there is no special communication perspective and direction requirements;
■Support voice transmission;
■Simple and convenient networking
Bluetooth communication technology
Bluetooth technology is an emerging technology, has not yet been put into widespread use, many Bluetooth devices are still in the laboratory test phase. However, it is certain that most of the devices with infrared wireless data communication function, in the future as well as the use of Bluetooth technology to realize the wireless connection. At the same time, the network characteristics of Bluetooth technology and voice transmission technology so that it can also realize the infrared technology can not be achieved in some specific functions, such as wireless phones, multi-device networking and so on.
Manufacturers and consumer acceptance
Bluetooth technology has gained the response of more than two thousand enterprises, which has a huge development and production capacity. Bluetooth has already possessed a high degree of popularity, and the majority of consumers are very interested in this technology.
Implantation cost
Currently on the market Bluetooth devices are still relatively rare. USB interface Bluetooth adapter, Bluetooth PC card and Bluetooth cell phone have been market-oriented products, the price is very high. This shows that the early development stage of Bluetooth implantation costs are still relatively high. However, it is estimated that the implantation cost can be under 30 dollars after batch production. In the period of mature development of Bluetooth technology, the implantation cost should be able to control within 10 dollars.
Disadvantages
Bluetooth is a technology that has not yet fully matured, and although it is described as promising, it has yet to be rigorously tested in actual use. Bluetooth also doesn't communicate at a very high rate, which may also have an impact on its development in today's data-explosive age.
Currently, mainstream software and hardware platforms do not provide support for Bluetooth, which makes the application of Bluetooth more costly and more difficult to popularize.
The ISM band is an open band and may be interfered with by, for example, microwave ovens, cordless phones, scientific research instruments, and industrial or medical equipment.
Infrared
Infrared IrDA, or IR for short, is a wireless communication method that allows for wireless data transmission. Since its invention in 1974, it has been very commonly used in applications such as infrared mice, infrared printers, infrared keyboards, and so on.
Infrared characteristics: infrared transmission is a point-to-point transmission, wireless, can not be too far away, to align the direction, and there can be no obstacles in the middle of the obstacles that is, can not go through the wall, almost impossible to control the progress of the information transfer; IrDA is already a set of standards, IR receiving / transmitting components are also standardized products.
Difference between infrared and bluetooth
1. Distance
Infrared: alignment, direct, 1-2 meters, single to single
Bluetooth: about 10 meters, can strengthen the signal, can be around the corner, can not be aligned, can not be in the same room, the link to the maximum number of up to 7, while distinguishing hardware.
2. Industry
Infrared: very popular
Bluetooth: preliminary applications
3. Speed
Infrared: fast
Bluetooth: slow
4. Security
Infrared: no difference
Bluetooth: encrypted
5. Cost
Infrared: a few dollars --- tens of dollars
Bluetooth: 400-800 yuan