JL 2.4G Bluetooth Low-Latency Audio Headset Solution: Chip Selection, Latency, Hardware Design

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JL 2.4G Bluetooth Low-Latency Audio Headset Solution: Chip Selection, Latency, Hardware Design

This document introduces JL's low-latency audio headset solution using 2.4G/Bluetooth technology.

1. Chip Selection

USB Dongle Side:
- JL7016M or JL7086E
- Capable of 48KHz/16bit stereo output
- Supports UAC (USB Audio Class) - plug-and-play, no driver required
Headset Side:
- TWS: JL7083G
- Stereo headphones: JL7083F

2. Audio Transmission Process

Uplink (microphone to host):

Audio sampled via USB (~2.5ms)
Encoded (~1ms)
Transmitted over 2.4G/Bluetooth using LC3 codec at 48KHz/16bit mono

Downlink (host to headset):

Audio LC3 encoded at 48KHz/16bit stereo
Transmitted wirelessly to headset
Decoded (~2ms)
Playback via DAC (~7ms)

3. Latency Performance

TWS headphones: ~20ms total latency
Over-ear/headband-style headphones: ~17ms total latency

These values are excellent for gaming and multimedia scenarios where low latency is crucial.

4. JL 2.4G Bluetooth Low-Latency Headset Solution Overview

(1) Chipset & Basic Capabilities

JL7016M or JL7086E for USB Dongle (receiver/transmitter)
Outputs 48KHz/16bit stereo
Supports UAC (plug-and-play with no driver required)

(2) Encoding - Transmission - Decoding Flow

Uplink (mic to host device):

Mic collects sound
USB sampling (~2.5ms)
LC3 encoding (~1ms)
Transmitted via 2.4G/Bluetooth to host (PC/phone)

Downlink (host to headset):

Host audio encoded into LC3 (48KHz/16bit stereo)
Transmitted wirelessly to headset
Decoded (~2ms)
DAC playback (~7ms)

(3) Latency Performance

TWS headphones total latency: ~20ms
Over-ear headphones total latency: ~17ms
Excellent for low-latency needs in gaming/video applications

5. Chip Solution Comparison

Solution Type	Dongle Chip	Headset Chip	Protocol	Notes
Old	JL7016M-QFN32	JL7018F	EDR	Legacy solution
New #1	JL7016M-QFN32	JL7083F	LC3	Stereo
New #2	JL7086E-QFN32	JL7083F	LC3	Stereo
New #3	JL7086E-QFN32	JL7083G	LC3	TWS

Headband-style gaming headset: JL7086E + JL7083F
TWS-style earbuds: JL7086E + JL7083G

6. Power Consumption Note

2.4G wireless inherently consumes more power. The typical power consumption is around 20-30mA, and currently, this is a design limitation that cannot be significantly reduced.