Bluetooth adapter, is the interface converter for applicable Bluetooth devices, expand the device that does not support Bluetooth function or Bluetooth damage, the most applicable scenario is to get rid of the annoyance of various lines, to achieve multiple devices connected to the same computer at the same time, such as Bluetooth keyboard, Bluetooth mouse, Bluetooth headset and so on at the same time.
It is recommended to choose the style that supports Bluetooth 5.0 or above, and you can choose the right interface for the device according to your needs.
Bluetooth adapter is also very simple to use, in win8 or above system can achieve drive-free, plug and play; generally support 4-7 Bluetooth devices connected at the same time.
一、the working principle of Bluetooth adapter
Based on Bluetooth technology application development products, Bluetooth technology is the use of global universal short-range wireless communication technology, the use of free 2.4GHz band, in order to avoid signal interference with each other, the use of 1600 times high frequency frequency hopping and encryption technology. With low power consumption, transmission distance farther than infrared characteristics, using usb plug-and-play interface, can transfer files, video, audio, etc. below 10M, the existing Bluetooth specification versions are 1.0, 2.0, 3.0, 4.0, 5.0, 5.1, 5.2 version.
Bluetooth version Transmission characteristics
1999 Bluetooth 1.0 748~810kb/s
2004 Bluetooth 2.0 New EDR technology, maximum transmission speed 3M/s, support duplex mode, support transmission of voice at the same time, can also transfer pictures, etc.
2007 Bluetooth 2.1 more power saving, send interval expanded from 0.1s to 0.5s
2009 Bluetooth 3.0+HS Adopt new alternate RF technology, support up to 24M/s transmission speed, idle power consumption reduced
2010 Bluetooth V4.0 includes traditional Bluetooth technology, high-speed Bluetooth and new Bluetooth low-power technology.
With low cost, support different manufacturers interoperability, 3mm delay, more than 100 meters transmission distance, AES encryption and other features.
2013 Bluetooth 4.1 supports seamless LTE collaboration
2014 Bluetooth 4.2 supports 6LoWPAN, a low-speed personal area network standard based on IPV6
2016 Bluetooth 5.0 Longer transmission distance (theoretical 300m), faster transmission speed (up to 2Mbps), larger packet capacity in low power mode.
Support indoor navigation and positioning. mesh network.
二、 the main parameters
1, the use of Bluetooth chip module brand
CSR series chip, Broadcom series chip, etc.
Now most of the market is 4.0 chip, generally said to be compatible with 5.0, because Bluetooth 5.0 compatible with Bluetooth 4.0, if you want to buy Bluetooth 5.0 or more must look at the right chip.
Chip brand and model characteristics
Qualcomm chip, QCC302x support SBC, aptX, AAC, APTX-LL, APTX-HD, stereo line input.
CSR 87 series chip Support Bluetooth 5.0, aptX, ANC, etc.
BES 2300 Domestic, support Bluetooth 5.0, dual-mode, IBRT, etc.
LODA 1526P Support Bluetooth 5.0
2、Signal coverage: 0~20m, with enhanced signal can be expanded to 45m.
3、Support win8/win10 above driver-free installation, win7/XP below system can only download the driver to install manually.
4, instantaneous response, low latency and no lag.
5, a variety of communication protocols supported (GAP, A2DP, HSP, HFP, APT-x, HID over GATT, AVRCP, FTP), according to the current market situation, the main support for Bluetooth 4.0 or Bluetooth 5.0.
6、The design size should be small and easy to carry.
7、After the first successful match, subsequent power on can be automatically paired.
三、Bluetooth adapter common problems
1、Bluetooth adapter can not search for Bluetooth devices how to do?
(1) to confirm whether the Bluetooth driver has been installed.
(2) re-plug the Bluetooth adapter, or restart the computer.
(3) reset the Bluetooth device to be connected.
2、How to play no sound after successful pairing of Bluetooth headset audio?
(1) in the windows audio manager, confirm the audio playback device is selected Bluetooth headset, audio.
(2) When the Bluetooth adapter is used in the Win7 system, add Bluetooth devices do not select the "All" type.
3、After the Bluetooth adapter is connected to the computer, the sound icon keeps flashing and the sound is intermittent?
The reason may be that the power supply is not enough, you can try the following methods:
(1) is a desktop computer, you can switch to the back of the chassis usb port to try.
(2) in the system's device manager: universal serial bus controller->usb, these settings, the "allow the computer to turn off devices to save power" this unchecked.
4、Can it support both audio output and microphone (voice) input?
Yes, because the Bluetooth adapter contains Bluetooth receiving and transmitting functions, after connecting to Bluetooth, open the control panel in the computer system, select "Hardware and Sound" under "Manage Audio Devices", the output device and input device (microphone) are selected Bluetooth headset can be.