LE Audio Development History
LE Audio Development History And Bluetooth LE Audio Module Introduction
1. Классический Bluetooth
1）One transmitter connected to one receiver
2）Music mode: A2DP, controlled by AVRCP protocol
Music pause/play, up and down song/volume up and down
3）Call mode: HFP (Профиль без рук)
Telephone hands-free protocol, answer/hang up/reject/voice dialing, и т. д..
A2DP: Расширенный профиль распределения звука
AVRCP: Audio/Video Remote Control Profile
2. Bluetooth TWS#1（True Wireless Stereo）
1）The transmission protocol is the same as the classic Bluetooth
2）The left /right earphone is connected to the mobile phone,
The left or right earphones are also connected to each other, so the earphones are both receiver(Раковина) and transmitter(Источник).
3. Bluetooth Дв#2（True Wireless Stereo）
1）The transmission protocol is the same as the classic Bluetooth
2）The mobile phone is connected to the left/right earphone at the same time, and the left and right channels are automatically assigned
4. Audio Full-duplex
1）The transmission protocol is the same as the classic Bluetooth
2）Connect two headphones at the same time, regardless of the left and right channels
3）Earphone 1 and earphone 2 can talk each other
4）Module recommend: BT901, BT906, BT936B, BT1036B и т. д..
5. Bluetooth LE AUDIO
1）Broadcast function: the mobile phone can connect multiple Bluetooth devices at the same time, including Bluetooth headsets, hearing aids etc.
2）Sharing function: multi-person connection
3）Multi-point connection, such as mobile phone, ipad, computer, и т. д.. at the same time
4）Runs on Bluetooth low energy technology
5）High-quality, high-speed transmission—LC3 encoding
6）Low latency (minimum 20ms, about 1-200ms below Bluetooth 5.1)
7）Bluetooth version 5.2 or above
6. LE AUDIO–LC3
1）The LC3 (Low Complexity Communications Codec) technical specification was officially released by the Bluetooth SIG on September 15, 2020. All audio profiles (Профили) из Аудио will be forced to use the LC3 audio codec device.
2）The transmission rate comparison between LC3 and SBC is as follows
Pareasycom Bluetooth LE AUDIO Module Introduction
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