LE Audio Development History And Bluetooth LE Audio Module Introduction

1. クラシック 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 (ハンズフリープロファイル)
Telephone hands-free protocol, answer/hang up/reject/voice dialing, 等.

A2DP: 高度なオーディオ配信プロファイル
AVRCP: Audio/Video Remote Control Profile

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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(シンク) and transmitter(ソース).

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3. ブルートゥース 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

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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 等.

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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 Bluetooth 5.1)
7）Bluetooth version 5.2 or above

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6. オーディオ – LC3
1）LC3 (低複雑性の通信コーデック) 技術仕様は 9 月に Bluetooth SIG によって正式にリリースされました 15, 2020. すべてのオーディオプロファイル (プロファイル) の オーディオ LC3 オーディオ コーデック デバイスの使用が強制されます.
2）LC3とSBCの通信速度比較は以下の通り

lea devlopment history 1

feasycom Bluetooth LE AUDIO モジュールの紹介

さらに詳しく, Feasycomチームに連絡してください.