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Do You Know the Principle of Bluetooth Transmission in Headphones?

Do You Know the Principle of Bluetooth Transmission in Headphones?

Issue Time:2022/05/05
Wireless earphones are now loved by people of all ages. A wide range of sophisticated wireless earphones using Bluetooth technology. Now let's take a look at the related Bluetooth technology. Bluetooth technology is an open global specification for wireless data and voice communications. It is a special short-range wireless technology connection based on a low-cost, short-range wireless connection to establish a communication environment for fixed and mobile devices.

The role of bluetooth

Bluetooth enables some of today's portable mobile and computer devices to connect to the Internet without cables and to access the Internet wirelessly.

The principle of bluetooth transmission

Master-slave relationship

Bluetooth technology stipulates that when Bluetooth communication is performed between each pair of devices, one must be the master role, and the other must be the slave role to communicate. 

When communicating, the master device must perform a search and initiate pairing. After that, both parties can send and receive data. In theory, one bluetooth master device can communicate with 7 bluetooth slave devices at the same time. Devices with Bluetooth communication capabilities can switch between the two roles.

It usually works in slave mode and waits for other masters to connect. When necessary, it switches to the main mode and initiates calls to other devices. When a Bluetooth device initiates a call in master mode, it needs to know the other party's Bluetooth address, pairing password, and other information. After pairing is complete, you can directly initiate a call.

Calling process

When a bluetooth master device initiates a call, the first step is to find out which bluetooth devices are around to be found. After the master device finds the slave bluetooth device, it pairs it with the slave bluetooth device. At this time, you need to enter the PIN code of the slave device, and some devices do not need to enter the PIN code. After pairing is complete, the Bluetooth slave device records the trust information of the master device. At this point, the master device can initiate a call to the slave device.

Paired devices no longer need to be paired again on the next call. The paired device can also initiate a link establishment request as a slave Bluetooth headset, but the Bluetooth module used for data communication generally does not initiate a call. 

After the link is established successfully, the master and slave terminals can carry out two-way data or voice communication. In the communication state, both the master and slave devices can initiate link disconnection and disconnect the Bluetooth link.

Data transmission

In Bluetooth data transmission applications, one-to-one serial data communication is one of the most common applications. A Bluetooth device is pre-set with pairing information between two Bluetooth devices before leaving the factory. Addresses, etc., the devices at both ends will automatically establish a chained transparent serial port transmission without the intervention of peripheral circuits.

In a one-to-one application, slave devices can be set to two types. One is the silent state, that is, it can only communicate with the designated master device and cannot be searched by other Bluetooth devices. Can also be found on other Bluetooth devices.

How to connect a bluetooth headset to a phone? First, press and hold the power button of the Bluetooth headset for about ten seconds until you see the signal light flashing, and then turn on the Bluetooth of the mobile phone. Then turn on bluetooth, search for nearby bluetooth devices, find the bluetooth name of the bluetooth headset, click connect, and it can be used after the connection is successful. If you want to customize sports wireless earphones, please contact us.

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