Bluetooth is a radio technology that supports short-range communication (usually within 10m) of the device. After several years of development, we are no stranger to it. It is also an indispensable module in digital products. The advent of Bluetooth technology allows us to connect to a variety of devices without being tied to a variety of data lines, such as audio, computers, mice, keyboards, and even cars. This technology is the easiest and most convenient way to communicate wirelessly between two devices. It also simplifies communication between the device and the Internet, making data transfer faster and more efficient.
Bluetooth 3.0 standardOn April 21, 2009, the Bluetooth SIG officially announced the next-generation standard specification "Bluetooth Core SpecificaTIon Version 3.0 High Speed" (Bluetooth Core Specification Version 3.0). The core of Bluetooth 3.0 is "Generic Alternate MAC/PHY". (AMP), a new alternative RF technology that allows the Bluetooth stack to dynamically select the correct RF for any task.
Bluetooth 3.0's data transfer rate has increased to approximately 24 Mbps (you can call 802.11 WI-FI for high-speed data transfer when needed). In terms of transmission speed, Bluetooth 3.0 is eight times that of Bluetooth 2.0. It can be easily used for data transmission from VCR to HDTV, PC to PMP, UMPC to printer, but both parties need to meet this standard to achieve the function.
The Bluetooth 4.0 specification was officially released on July 7, 2010. The biggest significance of the new version is low power consumption. At the same time, it enhances device compatibility between different OEMs and reduces latency. The theoretical maximum transmission speed is still 24Mbps (ie 3MB/). s), the effective coverage is expanded to 100 meters (previous version is 10 meters). The standard chip is used by a large number of mobile phones and tablets, such as Apple The New iPad tablet, and Apple 4.0, Meizu MX4, HTC One X and other mobile phones with Bluetooth 4.0 function.
Bluetooth 4.0 and 3.0 differenceBluetooth 4.0 is the upgrade standard for Bluetooth 3.0.
Bluetooth 3.0 uses Wi-Fi technology, which greatly increases the transmission speed. In this way, the Bluetooth 3.0 device will be able to pass
Wi-Fi is connected to other devices for data transmission; in Bluetooth 4.0, another layer of functional structure is added on the basis of version 3.0, and a low-power mode is introduced. After the low-power mode is enabled, the consumption of the Bluetooth device is reduced. The power will drop significantly. The most important feature of Bluetooth 4.0 is power-saving technology. Extremely low operating and standby power consumption allows a button cell to operate continuously for several years. In addition, low cost and cross-vendor interoperability, 3 milliseconds low latency, over 100 meters long distance, AES-128 encryption and many other features can be used for pedometers, heart rate monitors, smart meters, sensor Internet of things, etc. The field greatly expands the range of applications of Bluetooth technology.
Bluetooth 4.0 has been commercialized, in the latest Galaxy S3, S4, Note2, SurfaceRT, iPhone 5, iPhone 4S, Meizu MX2, Moto Droid Razr, HTC One X, Xiaomi Phone 2, The New iPad, iPad 4, MacBook Air Bluetooth 4.0 technology has been applied to Macbook Pro and Taiwanese ACER AS3951 series/Getway NV57 series, and ASUS UX21/31 Samsung NOTE series. At present, many brands have launched Bluetooth 4.0 version of peripheral devices, while supporting Bluetooth 4.0 and NFC WOOWI HERO, jabra MOTION, etc., Bluetooth 4.0 speakers support Big jambox, Braven and other products.
The Bluetooth Technology Alliance (Bluetooth SIG) announced on July 7, 2010 that it has officially adopted the Bluetooth Core SpecificaTIon Version 4.0 and launched the corresponding certification program. Member manufacturers can submit their products for testing, and will receive Bluetooth 4.0 standard certification after passing. The technology has extremely low operating and standby power consumption and can be used for several years even with a coin cell battery.
Bluetooth 4.0 is a supplement to the Bluetooth 3.0+HS specification. It is designed for wireless solutions that require high cost and power consumption. It can be widely used in many fields such as health care, physical fitness, home entertainment, and security.
It supports two deployment methods: dual mode and single mode. In dual mode, the low-power Bluetooth 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. The overall architecture remains basically unchanged. Therefore, the cost increase is limited.
Single mode for highly integrated, compact devices, using a lightweight Link Layer for ultra-low power standby mode operation, simple device recovery and reliable point-to-multipoint data transfer, and networking sensors The order of low-power Bluetooth traffic is scheduled in Bluetooth transmission, along with advanced energy-saving and secure encryption connections. advantage
Bluetooth 4.0 combines three specification sets, including traditional Bluetooth technology, high-speed technology and low-energy technology. The biggest difference compared to version 3.0 is low power consumption. "The power consumption of version 4.0 is 90% lower than that of the older version, and it saves power," said Lu Rongliang, technical marketing manager for Greater China, Bluetooth Technology Alliance. "With Bluetooth technology, traditional technologies such as mobile phones, games, headsets, laptops and automobiles The application field will expand to new areas such as the Internet of Things and medical services, and the requirements for low power consumption will be higher and higher. Version 4.0 enhances the low power consumption of Bluetooth in data transmission."
The low-power version allows Bluetooth technology to be extended to emerging markets powered by button batteries. Bluetooth low energy technology is an upgraded version based on the core specifications of Bluetooth low energy wireless technology, laying the foundation for the development of a wide range of emerging markets such as watches, remote controls, healthcare and motion sensors.
The technology will be used in hundreds of millions of Bluetooth phones, PCs and PDAs sold each year. Provide long-lasting wireless connectivity with the lowest power consumption, effectively expand the coverage of related applications, and open up new network services. Low-energy wireless technology features ultra-low peak, average, and standby power consumption; ultra-low-cost and lightweight features for device accessories and human-machine interface devices (HIDs); and more accessories for mobile phones and PCs The cost is minimized and smaller; beyond the global application, it is more intuitive and ensures interoperability of multiple device connections. Bluetooth 4.0 has a big impact on the personal fitness and health markets. Whether it's on a treadmill or a gadget in the office. Fitbit Wireless, Nike's new Fuelband, Motorola MOTACTV, and the stylish baseband are all good examples. And fitness watches are also committed to using Bluetooth to track physical activity and heart rate.
In addition, Bluetooth 4.0 is still backward compatible, including the classic Bluetooth technology specification and the Bluetooth high-speed technical specification with a maximum speed of 24Mbps. The three technical specifications can be used individually or simultaneously.
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