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 громкой связи)
Telephone hands-free protocol, answer/hang up/reject/voice dialing, и т. д..

A2DP: Расширенный профиль распределения звука
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(Раковина) and transmitter(Источник).

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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

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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 и т. д..

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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, 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

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6. LE AUDIO–LC3
1）The LC3 (Low Complexity Communications Codec) техническая спецификация была официально выпущена Bluetooth SIG в сентябре. 15, 2020. Все аудиопрофили (Профили) из Аудио будет вынужден использовать устройство аудиокодека LC3.
2）Сравнение скорости передачи между LC3 и SBC выглядит следующим образом:

lea devlopment history 1

Pareasycom Bluetooth LE AUDIO Введение в модуль

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