What is Bluetooth 4.0?

Bluetooth 4.0 is the latest Bluetooth version in 2012, an upgraded version of 3.0; compared to version 3.0, it is more power efficient, low cost, 3 milliseconds low latency, long effective connection distance, AES-128 encryption, etc.; usually used in Bluetooth headsets and Bluetooth speakers Wait on the device.

Bluetooth headset wholesale manufacturers believe that the Bluetooth 4.0 device communication program is a unified communication program platform. The main components include the communication library provided by the communication program. When constructing, it adopts object-oriented thinking and uses modular and component technology. The basic structure of the Bluetooth 4.0 device communication scheme includes pages, state managers, caches, class libraries, etc. Each component plays an important role in the operation of the system and can ensure the effective execution of applications.

Main features
Bluetooth 4.0 is a supplement to the Bluetooth 3.0+HS specification, specifically for wireless solutions that have high requirements for cost and power consumption, and can be widely used in many fields such as health care, sports and fitness, home entertainment, and security.
It supports two deployment modes: dual mode and single mode. In dual mode, the Bluetooth low energy function is integrated into the existing classic Bluetooth controller, or a low-power stack is added to the existing classic Bluetooth technology (2.1+EDR/3.0+HS) chip, and the overall architecture is basically unchanged , So the cost increase is limited.

Single mode is oriented to highly integrated and compact devices. It uses a lightweight Link Layer to provide ultra-low-power standby mode operation, simple device recovery and reliable point-to-multipoint data transmission. It also allows networked sensors to In the Bluetooth transmission, the order of the low-power Bluetooth traffic is arranged, and there are also advanced energy-saving and secure encrypted connections.
technical details
Speed: Support ultra-short data packets at a data transfer rate of 1Mbps, at least 8 eight groups of bits, and up to 27. All connections use the slow breathing mode (sniff subrating) added by Bluetooth 2.1 to achieve ultra-low duty cycles.
Frequency hopping: Use adaptive frequency hopping common to all Bluetooth specification versions to minimize crosstalk with other 2.4GHz ISM band wireless technologies.

Main control: smarter, can sleep for a longer time, wake up only when you need to perform an action.
Delay: The shortest time to complete the connection setup and start transmitting data within 3 milliseconds.
Range: Improve the modulation index, the maximum range can exceed 100 meters (depending on different application areas, the distance is different).
Robustness: All data packets use 24-bit CRC to ensure maximum resistance to interference.
Security: Use AES-128 CCM encryption algorithm for data packet encryption and authentication.
Topology: 32-bit addressing is used for each reception of each data packet, which can theoretically connect billions of devices; optimized for one-to-one connections, and supports one-to-many connections in a star topology; use fast connection and disconnection , Data can be transferred within the mesh topology without maintaining a complex mesh network.

Advantage
The advantages of Bluetooth 4.0 and ZigBee's response to Bluetooth 4.0 at this stage Bluetooth 4.0 is not only a high-speed addition to the traditional version of Bluetooth 3.0+HS

Bluetooth headset wholesalers believe that the transmission technology has also joined the low-power transmission technology of the Wibree standard. Obviously, Bluetooth is no longer the familiar "Bluetooth" that can only be used for WPAN[1], but a "three-in-one" Bluetooth that integrates traditional Bluetooth, high-speed technology and low-power consumption standards. Compared with the previous version, Bluetooth 4.0 has been greatly improved in terms of power consumption, execution speed, security, reliability, and compatibility of links between different devices. Such as:
(1) Low power consumption: Bluetooth 4.0 continues to use the previous Wibree standard and uses simple Gaussian Frequency Shift Keying (GFSK) modulation [5], which has very low operating and standby power consumption, according to Bluetooth technology According to the alliance, a button battery can support a device with a Bluetooth 4.0 module to work for at least one year, and it will only start when it needs to transmit data, and it will be in a sleep state at other times, which greatly reduces energy consumption. Depletion.
(2) Short running speed: the improved version of Bluetooth 4.0 only takes 3 seconds to start, which can be completely ignored.
(3) High transmission rate: Because Bluetooth 4.0 technology can support very short data packets, its transmission rate can be as high as 1Mb/s.
(4) Fast connection: The Bluetooth 4.0 version only needs 3ms to complete the connection establishment. At the same time, the linker can be quickly started with the application, and the connection can be closed immediately after the approved data is transmitted in a few milliseconds, which greatly shortens the connection time.
(5) Good stability: The Bluetooth 4.0 version uses a 24-bit cyclic repeat check (CRC), which ensures that all packets can still maintain maximum stability when interfered.
Undoubtedly, the birth of Bluetooth 4.0 brought hope to the development of Bluetooth technology, which made it get rid of the embarrassing situation of the "vase" and laid the technical foundation for its success.

Application prospects
1. Release the Internet of Things and cloud services
Bluetooth headset wholesalers believe that the new generation of portable and networked home devices will definitely utilize smart Bluetooth technology. As smart phones and tablets provide low-power Bluetooth 4.0 support for a wide range of new applications, designers can easily add exciting new features to many products connected to the Internet of Things.
2. Wireless gateway
The Bluetooth Technology Alliance is focusing on the secure interconnection of Bluetooth technology, and is also developing wireless gateways. Bluetooth can access the Internet through IP, and wireless Internet access for households and industries. This type of network requires higher security requirements.
3. Internet access
Notebook computers or mobile phones with built-in Bluetooth chips can not only use PSTN, ISDN, LAN, xDSL, but also cellular mobile networks can still be connected at a high speed.
4. Create new business opportunities for health, security and home entertainment
The Bluetooth technology is being put into security and personal health, and it will eventually be realized.
5. Can be used as a cordless phone
A mobile phone with a built-in Bluetooth chip can be used as a wireless phone at home. There is no need for two-way charging, which saves mobile phone costs. After leaving the house for a certain distance, it will automatically switch to the wireless network base station.
Passive Speaker:Bluetooth Speaker