Although Bluetooth 3.0 has not yet been fully popularized, the Bluetooth SIG (Bluetooth Technology Group, Bluetooth SIG) has once again introduced the Bluetooth 4.0 specification, which indicates that this is another major innovation in the history of Bluetooth. At the time of the launch of Bluetooth 4.0, we specially interviewed the relevant technical engineers of BluetoothSIG and asked them to explain in detail the technical features of Bluetooth 4.0.
In this article, we will experience the new application mode brought by low-power Bluetooth. While reviewing the development of Bluetooth, you will find that Bluetooth technology has once again lost its position and dignity after being once lost.
The current home living system, peer-to-peer architecture has brought tangled cables and confusion. If we want to connect game consoles, digital cameras, DVs, headsets, microphones and mobile phones, we may have to consider adding USB. , 1394, SPDIF and a variety of chargers and power outlet cables.
Figure 1: Point-to-point architecture brings cable connectivity problems
Is there a universal, easy-to-use method that does not require user intervention to connect various electronic devices without being overwhelmed by cables? Beyond Wi-Fi, Bluetooth, which is now familiar, is such a connection technology. It is designed for wireless automatic connection for individuals and families. Its three core features are wireless, low cost and automation.
Figure 2: Bluetooth wireless connection mode
How did you learn and be familiar with Bluetooth technology? I think for most users, it is nothing more than two ways - Bluetooth headset or Bluetooth function of the phone. Maybe you know how to use Bluetooth, but do you know Bluetooth technology? not necessarily! Especially after the release of Bluetooth 4.0 technology, which has been washed away and focused on the practical level, the application of Bluetooth has been greatly expanded. From the failure of 1.0 to the innovation of 4.0, what changes and evolution has Bluetooth technology experienced? What is the basic principle of Bluetooth technology? Of course, what else can everyone bring to us with Bluetooth 4.0? We are going to answer you one by one.
Bluetooth 4.0 protocol
Unlike the current mainstream Bluetooth 2.x+EDR and the unpopular Bluetooth 3.0+HS, Bluetooth 4.0 is the only comprehensive protocol specification for Bluetooth since its birth. It also proposes low-power Bluetooth, classic Bluetooth and high-speed Bluetooth. mode. Among them, high-speed Bluetooth is the main data exchange and transmission. Classic Bluetooth is focused on information communication and device connection. Bluetooth low-power is just as its name suggests, and it is mainly connected to devices that do not need too much bandwidth. These three protocol specifications can also be combined with each other to achieve a wider range of application modes. In addition, Bluetooth 4.0 also increases the transmission distance of Bluetooth to more than 100 meters (under low power mode).
The Bluetooth SIG said that the official launch of Bluetooth 4.0 is to enable the application system to select the technology itself through a single interface, rather than allowing consumers to manually select the connection mode of each device when the device is interconnected. The functional orientation of the game clearly follows the design idea of ​​Bluetooth focusing on usability and actual experience. In the three application modes, because classic Bluetooth and high-speed Bluetooth are only the continuation and enhancement of the old Bluetooth version, we will focus on the new Low-power Bluetooth technology.
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