Intelligent era "Bluetooth system" can not be underestimated

Bluetooth wireless technology uses a digital coding technique that extends the spectrum of wideband signals. It increases the number of transmitted bits through coding operations and expands the bandwidth used. Bluetooth uses frequency hopping to spread the spectrum. Frequency-hopping spread spectrum reduces the power spectral density of the signal in the bandwidth, which greatly improves the system's ability to resist electromagnetic interference and crosstalk, making the wireless data transmission of Bluetooth more reliable.

The implementation of Bluetooth depends on the application software, Bluetooth storage stack, hardware and antenna. It is suitable for applications including short-range communications such as data, images, and sound. Bluetooth technology can replace the wired cable used for communication between the cellular phone and the far-end network, providing a new multi-functional headset for use in devices such as cellular phones, PCs, and even a walkman, as well as notebook computers and personal digital assistants. Exchange of business card data between , cellular phones, etc. The solution can be solidified into a single chip that can be placed in various smart terminals.

Bluetooth technology provides low-cost, short-range wireless communications that form a personal network in a fixed and mobile device communication environment, enabling seamless sharing of resources across devices at close range. Obviously, this kind of communication technology has obvious difference from the traditional communication mode. Its original intention is to realize the function of the general cable with the same cost and security, thus making the mobile user get rid of the shackles of the cable. This determines that Bluetooth technology has the following technical features:

1 Globally applicable.

2 can simultaneously transmit language and data.

3 You can establish a temporary peer-to-peer connection.

4 has a good anti-interference ability.

5 The Bluetooth module is small and easy to integrate.

6 low power consumption.

7 open interface standards.

8 Low cost.

From the perspective of current Bluetooth products, Bluetooth is mainly used in mobile phones, palm computers, headsets, digital cameras, digital video cameras, car kits, and the like. In addition, the Bluetooth system can also be embedded in household appliances such as microwave ovens, washing machines, refrigerators, and air conditioners. With the development of Bluetooth technology, its application is more and more extensive.

Bluetooth products include PCs, notebook computers, mobile phones and other information devices and A/V equipment, automotive electronics, home appliances, and industrial equipment. Proponents of Bluetooth predict that once Bluetooth-enabled chips become very cheap, Bluetooth will find itself in almost every product, from microwave ovens to buttons on clothes.

The car phone is currently a major application of Bluetooth technology. Car phones generally have the functions of receiving and receiving calls, sending and receiving text messages, caller ID, Internet access, digital dialing, address book, call management, setting time and date, and some car phones have multiple frequencies or dual frequency, such as Motorola 8989 and Motorola M930. Some car phones also have Bluetooth capabilities, such as Nokia 616 and Nokia 810.

The main application groups of car phones are the heads of state organs and government departments, senior managers of enterprises and enterprises, business people, people who need to work outdoors, personnel working in remote suburbs or mountain areas, and special groups such as medical aid, fire fighting, Public security police, geological exploration, mining, oil field, airport, space launch site staff, outdoor sports enthusiasts and so on.

From the accessories, there are two types of accessories for car phones:

1 Car phone with handle, its main accessories are host, handle, handle seat and speaker.

2 Car phone without handle, its main accessories are host, display, control buttons and speakers.

The strong signal is the most prominent feature of the car phone. As we all know, the signal strength of a mobile phone is closely related to the operator's transmission power for setting up a base station for his mobile communication network and the proximity of the mobile phone to the base station. In relatively closed areas such as elevators, trains, and underground passages, the number of obstacles that the mobile phone signals must pass through will increase, which will also affect the signal strength of mobile phones. The car phone can be connected to an antenna that enhances the signal, so that it basically ensures the smoothness of the call. In addition, the on-board telephone uses an external antenna, and the external antenna is placed at a distance of at least 1 m from the human body, which greatly reduces the radiation damage to the human body.

Although many cell phones now have hands-free features, the volume is not perfect. The car phone is equipped with an independent high-power loudspeaker, and can also transmit the voice of the other party from the car audio through the wiring, so that the user can obtain a high-quality business-grade call quality. The car phone usually has a relatively large keyboard, which is very convenient when dialing on the car. Some car phones also have the function of voice dialing and voice commands, allowing users to control the phone in voice mode without having to press the numeric keypad. Traffic safety.