LE Audio Development History And Bluetooth LE Audio Module Introduction

1. Bluetooth cổ điển
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, vân vân.

A2dp: Advanced Audio Distribution Profile
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(Bồn rửa) and transmitter(Nguồn).

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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

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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 vân vân.

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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, vân vân. 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. LE AUDIO–LC3
1）The LC3 (Low Complexity Communications Codec) Thông số kỹ thuật được Bluetooth SIG chính thức công bố vào tháng 9 15, 2020. Tất cả cấu hình âm thanh (Hồ sơ) của Âm thanh sẽ buộc phải sử dụng thiết bị codec âm thanh LC3.
2)So sánh tốc độ truyền giữa LC3 và SBC như sau

lea devlopment history 1

Feasycom Bluetooth LE AUDIO Giới thiệu mô-đun

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