LE Audio Development History
LE Audio Development History And Bluetooth LE Audio Module Introduction
1. クラシック ブルートゥース
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 (Hands-Free Profile)
Telephone hands-free protocol, answer/hang up/reject/voice dialing, 等.
A2DP: Advanced Audio Distribution Profile
AVRCP: Audio/Video Remote Control Profile
2. ブルートゥース TWS#1（True Wireless Stereo）
1）The transmission protocol is the same as the classic ブルートゥース
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(Sink) and transmitter(Source).
3. Bluetooth TWS#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 etc.
5. Bluetooth LE AUDIO
1）Broadcast function: the mobile phone can connect multiple ブルートゥース 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, 等. 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 ブルートゥース 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 言う on September 15, 2020. All audio profiles (プロフィール) の ザ・オーディオ will be forced to use the LC3 audio codec device.
2）The transmission rate comparison between LC3 and SBC is as follows
フィジーコム Bluetooth LE AUDIO Module Introduction
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