Ans:
The so-called Bluetooth (Bluetooth) technology is actually a short-range wireless communication technology, the use of "Bluetooth" technology, can effectively simplify the Pocket PC, laptop computers and cell phones and other mobile communication terminal equipment between the communication, also can successfully simplify the communication between these devices and the Inter, so that these modern communication devices and the Internet data transmission becomes more rapid and efficient, to broaden the way of wireless communication. Bluetooth" technology can effectively simplify the communication between mobile communication terminal devices such as PDAs, laptops and cellular phones, as well as successfully simplify the communication between these devices and the Inter, thus making the data transmission between these modern communication devices and the Internet more rapid and efficient, and widening the way for wireless communication. To put it plainly, it is the Bluetooth technology that makes modern some easily portable mobile communication equipment and computer equipment, without having to resort to cables can be networked, and can realize the wireless on the Internet, its actual scope of application can also be expanded to a variety of home appliances, consumer electronics and automobiles, and other information appliances, composed of a huge wireless communication network.
"Bluetooth" is the formation of the background is this: in May 1998, Ericsson, Nokia, Toshiba, IBM and Intel Corporation and other five well-known manufacturers, in the joint standardization of short-range wireless communications technology activities proposed Bluetooth technology, its purpose is to provide a short-range, low-cost wireless transmission The aim was to provide a short-range, low-cost wireless transmission technology for applications. These five vendors also established the Bluetooth Special Interest Group to enable Bluetooth technology to become the future standard for wireless communications. Chip juggernaut Intel was responsible for the development of semiconductor chips and transmission software, Ericsson was responsible for the development of wireless RF and cell phone software, and IBM and Toshiba were responsible for the development of interface specifications for notebook computers.In the second half of 1999, well-known industry giants Microsoft, Motorola, Sankon, Lucent, and the five Bluetooth Special Interest Group companies*** co-sponsored the establishment of the Bluetooth Technology Promotional Organization (BTPO), thereby creating a The world set off a wave of "Bluetooth" boom. The global industry is about to develop a large number of Bluetooth technology applications, so that Bluetooth technology presents an extremely broad market prospects, and predicts that the beginning of the 21st century will usher in a magnificent wave of global wireless communications.
Bluetooth and infrared are both a kind of wireless transmission, infrared application for a long time, Bluetooth is the last few years the development of a fast wireless transmission
Relative to infrared, bluetooth has several advantages: 1 transmission speed is about 10 times that of the infrared 2 effective distance is long, generally 10 meters 3 stable 4 do not have to be straight line to the transmission
Infrared data communication technology
What is IRDA?
What is IRDA?
IRDA stands for Infrared Data Association, and the series of infrared data communication standards developed by IRDA form the basis of infrared data communication technology. Infrared communication technology is a point-to-point data transfer protocol that is an alternative to the traditional cable connection between devices. Its communication distance is generally between 0 and 1 meter, the fastest transmission rate up to 16Mbps, the communication medium for the wavelength of 900 nanometers or so of the near infrared.
Characteristics of infrared communication technology
■It is a wireless connection technology widely used in the world, supported by a large number of hardware and software platforms;
■Through the data electrical pulse and infrared light pulses and the mutual conversion of the data pulse to achieve the wireless data sending and receiving.
■ Mainly used to replace the point-to-point cable connection;
■ The new communication standard is compatible with the earlier communication standard;
■ Small angle (within 30 degrees cone angle), short distance, point-to-point straight-line data transmission, confidentiality;
■ Transmission rate is higher, at present, the 4M rate of the FIR technology has been widely used, 16M rate of the VFIR technology has been released. VFIR technology has been released.
Uses of infrared data communication technology
Infrared communication technology is often used in the following devices:
■ Laptops, desktop computers, and handheld computers;
■ Printers, keyboards, mice, and other computer peripherals;
■ Telephones, cellular telephones, pagers;
■ Digital cameras, calculators, game consoles, set-top boxes, watches;
■Industrial and medical equipment;
■Network access devices such as modems.
Manufacturer and consumer acceptance
Infrared communication technology has been supported and adopted by many hardware and software vendors around the world, with mainstream software and hardware platforms now offering support for it. Infrared technology has been widely used in mobile computing and mobile communication devices, the huge installed base makes infrared wireless communication technology has a huge user group.
Implantation cost
Since most system-on-chips have infrared communication control circuits, implanting infrared functionality into a system requires only the addition of an infrared transceiver device. This reduces the cost of implanting infrared communication to less than $3 for high volume production.
Disadvantages
■ Short communication distance, the communication process can not be moved, in case of obstacles to communication interruption.
■ Currently widely used SIR standard communication rate is low (115.2kbit/s)
■ The main purpose of infrared communication technology is to replace the cable connection for wireless data transmission, single function, poor scalability.
What is Bluetooth?
Bluetooth (Bluetooth) is a close-range wireless data communication technology standard proposed by Toshiba, Ericsson, IBM, Intel, and Nokia in May 1998***. It is capable of realizing 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.
Features of Bluetooth communication technology
■ Bluetooth works in the global open 2.4GHz ISM (i.e., industrial, scientific, medical) band;
■ The use of 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 sequence of codes constantly from a channel In one connection, the radio transceiver continuously "hops" from one channel to another in a certain code sequence;
■A Bluetooth device can simultaneously establish a connection with seven other Bluetooth devices;
■Data transfer rate up to 1Mbit/s;
■Low-power consumption, good communication security;
■Can be connected over obstacles within the effective range,
■Can be connected without special communication viewpoints. Connection, there is no special communication perspective and direction requirements;
■ support for voice transmission;
■ network is simple and convenient
The use of Bluetooth communication technology
Bluetooth technology is an emerging technology has not yet been put into widespread use, and many of the current Bluetooth devices are still in the laboratory test phase. However, it is certain that most of the devices with infrared wireless data communication function can use Bluetooth technology to realize wireless connection in the future. 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.
Manufacturer and consumer acceptance
Bluetooth technology has gained the response of more than 2,000 companies, which has a huge development and production capacity. Bluetooth already has a high level of awareness and the general consumers are interested in this technology.
Implantation costs
Currently on the market Bluetooth devices are still relatively rare. USB interface Bluetooth adapter, Bluetooth PC card and Bluetooth cell phone already have a market-oriented products, the price is very high. It can be seen that Bluetooth early development stage implantation costs are still relatively high. However, it is estimated that the implantation cost can be under 30 dollars after batch production. In the mature period of Bluetooth technology development, the implantation cost should be able to control within 10 dollars.
Disadvantages
Bluetooth is a technology that is not yet fully mature, and although it is described as promising, it has yet to be rigorously tested in real-world use. Bluetooth also doesn't have a very high communication 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 can be interfered with by microwave ovens, cordless phones, scientific instruments, and industrial or medical equipment.
Summary
Popular wireless technologies at a glance
Maximum data rate Range radius (meters) Cost Voice network support Data network support
IEEE802.11b 11 Mbps 100 to 300 High YES YES YES
Bluetooth 1 Mbps 10 to 100 General YES YES
HomeRF 1.6 Mbps
Can be increased to 11Mbps 50 General YES YES
IrDA 16 Mbps 2 Low NO YES
Summarizing the above, it can be seen that the Bluetooth technology obviously has a greater advantage, and it should be able to become an alternative technology for infrared wireless data communication. However, due to the current Bluetooth technology is still in the early stages of development, subject to a variety of constraints, Bluetooth technology implantation costs are high, fewer communication objects, communication rate is low and the technology is not very mature, its development and popularity still need to go through the market refining and the test of time, its own technology is also pending continuous improvement and enhancement. On the contrary, infrared communication technology, it has mature technology, low cost, good compatibility and communication rate is higher, and has obtained a wide range of hardware and software support and is being generally used. Although Bluetooth technology may eventually replace the infrared communication technology, but this process may take a long time, this period of time the infrared communication technology will still be in the field of short-range wireless data communication play an important role.
Infrared technology (IRDA) and Bluetooth technology (Bluetooth) have their own advantages and shortcomings, in the future, they will be in a period of time, they will be in a kind of competition, promote each other and complement each other's development situation. Bluetooth technology within a short period of time is difficult to shake the solid position of infrared technology, in fact, infrared technology and Bluetooth technology *** with the existence of a perfect short-range wireless data communication technology system.