Bluetooth system composition tws earbuds charger

A Bluetooth system generally consists of four functional units: an antenna unit, a link control (firmware) unit, a link management (software) unit and a Bluetooth software (protocol stack) unit. www.bjbjaudio.com          <a style="opacity:0.0;color:#ffffff"> tws earbuds charger</a>              <a style="opacity:0.0;color:#ffffff"> tws earbuds charger</a>

1. Antenna unit
Bluetooth requires its antenna part to be very small in size and light in weight. Therefore, the Bluetooth antenna is a microstrip antenna. The Bluetooth air interface is based on an antenna level of 0dB. The air interface follows FCC standards for the ISM band with a level of 0dB. www.bjbjaudio.com           <a style="opacity:0.0;color:#ffffff"> tws earbuds charger</a>    

2. Link Control (Firmware) Unit
In current Bluetooth products, three ICs are used as the connection controller, baseband processor, and RF transmitter/receiver, and 30 to 50 individual tuning elements are used. The baseband link controller is responsible for handling the baseband protocol and some other low-level conventional protocols. It has 3 error correction schemes: 1/3 scale forward error correction (FEC) code, 2/3 scale forward error correction code and automatic request repeat (ARO) scheme of data. The purpose of adopting the FEC (Forward Error Correction) scheme is to reduce the number of data retransmissions and reduce the data transmission load. However, in order to realize error-free transmission of data, FEC must generate some unnecessary overhead bits to reduce the transmission efficiency of data. This is because packets are elastically defined as to whether or not FEC is used. The header is always protected by 1/3 of the FEC code, which contains useful link information. www.bjbjaudio.com

3. Link management (software) unit
The Link Management (LM) software module carries the link's data settings, authentication, link hardware configuration and some other protocols. LMs are able to discover other remote LMs and communicate with them via LMP (Link Management Protocol). The LM module provides the following services: send and receive data: request name: link address query; establish connection; authentication; link mode negotiation and establishment; determine the type of frame. In addition, it also controls the working state of the device, namely breathing (Sniff), hold (Hold) and sleep (Park) three modes.
Mode. Set the device to breathing mode, the Master (host) can only send data regularly in a specific time slot, the Slave reduces the rate of "listening" messages from Pioconet, and the "breathing" interval can be adjusted according to the application requirements: the device Set to Hold mode, Master can set Slave to Hold mode, in this mode, only one internal counter is working. Slave can also actively request to be set to Hold mode. Once the unit in Hold mode is activated, the data transfer also restarts immediately. Hold mode is generally used when connecting several Piconets or devices with low power consumption, such as temperature sensors. www.bjbjaudio.com      <a style="opacity:0.0;color:#ffffff"> tws earbuds charger</a>      <a style="opacity:0.0;color:#ffffff"> tws earbuds charger</a>