The birth of the Bluetooth headset

　　Bluetooth Headset History

　　The story goes back to the 10th century AD.

　　At that time, the Northern European princes were fighting for supremacy. In order to put an end to these wars, the King of Denmark stepped forward, and with his unremitting efforts, the bloody war was stopped and all sides came to the negotiating table. Through communication, the Dukes became friends.

　　And because the King of Denmark loved blueberries so much that his teeth were dyed blue, his name faded into history and was better remembered as the "Bluetooth King." Meanwhile, Bluetooth has become synonymous with communication.

　　In 1994, Ericsson first proposed the concept of Bluetooth. After that, Ericsson joined nokia, Toshiba, IBM and Intel to establish the Bluetooth technology Alliance. As more and more technology giants joined the alliance, the range of bluetooth applications became more and more extensive, and bluetooth versions kept iterating from Bluetooth 1.0, 1.1, to 2.0, 2.1, and then to the familiar 3.0, 4.0, 5.0. The transmission rate of Bluetooth increases gradually, and the power consumption decreases gradually.

　　How bluetooth headset works

　　The working principle of Bluetooth headset can be roughly divided into four steps as shown in the figure:

　　1. The decoding chip in the mobile phone decodes MP3 and other music files, generates digital signals and sends them to the Bluetooth headset through Bluetooth;

　　2. The Bluetooth headset receives digital signals and converts them into analog signals that can be understood by adult ears through the digital-analog conversion chip inside the Bluetooth headset;

　　3. The signal amplification chip inside the earphone is needed to amplify the analog signal;

　　4. The earphone unit receives the amplified signal and emits a sound, at which point the ear hears the sound of music.

　　Common English abbreviations are introduced

　　NFC: Near field communication (NFC) technology. A Bluetooth headset with this feature can connect to a player quickly by touching it.

　　AAC: Dolby LABS technology, is a high compression ratio encoding algorithm, Apple Music has a large number of AAC audio, sound quality is better than MP3 at the same bit rate, iPhone bluetooth transmission using AAC encoding.

　　AptX: Qualcomm's main encoding technology, more efficient than traditional Bluetooth encoding, sound retention more detail. Most new Android phones come with AptX, but you need it in your Bluetooth headset to be effective.

　　LDAC: A Bluetooth transmission technology developed by SONY that can transmit up to three times as much data as normal Bluetooth and enable lossless music playback over Bluetooth, although only SONY devices support this technology.