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TWS
Application Overview
Low-Latency High-Definition Stereo Sound, Wireless Free Experience for Multiple Scenarios

This solution is applicable to true wireless stereo (TWS) Bluetooth earphones, designed to free users from the constraints of wired connections. While delivering high-quality audio performance, it also expands possibilities for diversified interactions, thereby achieving an immersive and multi-functional user experience. Compatible with Bluetooth 5.0 and higher versions, the solution fundamentally mitigates latency and disconnection issues inherent to traditional wireless audio, ensuring low-latency playback with perfect audio-visual synchronization. By optimizing transmission technologies, it effectively minimizes audio quality loss, presenting users with delicate, full-bodied high-definition stereo sound. In addition, the solution features low power consumption, which significantly extends device battery life. It also supports seamless and rapid switching between multiple devices, catering to flexible usage requirements. Widely adaptable to diverse scenarios including home entertainment, sports and fitness, office meetings, and outdoor commuting, this solution fully meets users’ demands for premium wireless audio across different environments.

System Structures

Built on a lightweight design and high-definition lossless audio quality, true wireless stereo (TWS) Bluetooth earphones feature a core advantage in the multi-link collaborative architecture of their Bluetooth connection system. Each type of link has a clear division of labor, adapting to different scenarios while also enabling efficient collaboration to form a complete transmission loop, thus delivering a low-latency, highly stable, and immersive audio experience for users.

Audio Link: The Legacy Link between the master earphone and the audio source acts as the core channel for audio and data transmission, reliably supporting music playback, voice calls, and data transfer to meet basic interaction requirements. The slave earphone monitors data from both the master earphone and audio source in real time, ensuring synchronized playback in active mode and eliminating audio latency.

Low-Power Bluetooth Link: The master earphone establishes an LE/LEA connection with the mobile APP, while the slave earphone establishes an LEA connection with the APP. The audio source separately connects to the master and slave earphones via LEA Link. The LEA Broadcast adopts a "audio source direct broadcasting + independent reception by master and slave earphones" mode, which effectively resolves the latency inconsistency issue inherent in traditional connection methods.

Binaural Collaborative Link: The master-slave role negotiation is completed through broadcasting and scanning during the "Engage" process, laying the foundation for subsequent connections. The Legacy Link is responsible for sending control commands, forwarding data between the two earphones, and recovering lost data on the slave earphone to ensure transmission integrity.

Device Management & Function Expansion: The master earphone communicates with the charging case via BLE Link for control and information exchange, while both earphones and the charging case implement device management through 1Wire UART communication. The HTTPS connection between the audio source and cloud server provides value-added services such as AI functionality for the earphones, enabling continuous expansion of device capabilities.

Application Structure

Application Scenarios

Application in travel and tourism scenarios
Application Scenario
Immerse in the Journey, Noise Isolation on the Go

This solution is applicable to scenarios such as air and high-speed rail travel, cross-border communication, and scenic spot visits, meeting the needs for noise cancellation, translation, and long battery life during journeys. The product's deep noise cancellation function effectively isolates traffic noise, enhancing resting comfort. Some models also offer EQ presets to adapt to different music styles, catering to the audio needs while visiting scenic spots. Additionally, the charging case is designed to balance portability and storage.

Application in gaming and entertainment scenarios
Application Scenario
Designed for Gaming, Audio-Visual Synchronization

This solution is suitable for scenarios such as mobile game battles and console gaming, meeting gamers' core needs for low-latency audio-visual synchronization and clear voice communication. The product is equipped with a gaming mode and features esports-grade latency, coupled with optimized esports audio effects, which can accurately reproduce spatial sound effects in games, such as footsteps and gunshots. The dual-microphone call noise cancellation technology can effectively filter out ambient background noise, ensuring clear communication among teammates. Some models support switching to gaming mode via voice commands for more convenient operation. Meanwhile, its long battery life design supports continuous use across multiple game sessions.

Application in study and exam preparation scenarios
Application Scenario
Calm and Long-Lasting, Comfortable and Focused

This solution is suitable for focus-required environments such as libraries and study rooms, effectively mitigating common distractions like page-turning sounds and conversations. Equipped with active noise cancellation (ANC), the product blocks background noise, while its semi-in-ear or open design helps reduce ear canal pressure during prolonged wear. Some models support low-latency audio transmission, ensuring audio-visual synchronization for online courses, and their battery life enables all-day continuous audio playback and listening practice for study purposes.

Application in business office scenarios
Application Scenario
Smart Connected Meeting, Dynamic Noise Cancellation

This solution is applicable to scenarios such as indoor meetings, remote collaboration, and business travel work, meeting users' needs for a quiet environment and efficient communication tools. Equipped with intelligent noise cancellation technology, the product dynamically adapts to ear canal structures to effectively isolate office noise or airplane cabin noise. Its cross-device audio switching function enables seamless transition of meeting calls between mobile phones and computers. Additionally, the product features a long-battery-life design, supporting all-day use during business trips.

Application in sports and fitness scenarios
Application Scenario
Secure Fit, Wind Noise Cancellation

This solution is suitable for dynamic scenarios such as running, fitness training, and outdoor cycling, meeting users' core needs of breaking free from wired constraints, sweat/water resistance, and secure fit. The product achieves physical stability through an in-ear snug design or earhook structure, paired with waterproof functionality to effectively resist sweat and rain. Selected models feature enhanced bass performance and wind noise reduction technology, enabling music playback that matches workout rhythms while ensuring clear outdoor calls. Additionally, the lightweight body design helps reduce wearing fatigue during physical activities.

Application in daily commuting scenarios
Application Scenario
Omnidirectional Noise Cancellation, Clear Commuting Experience

This solution is suitable for noisy environments such as subways, buses, and pedestrian streets, effectively addressing issues where external noise interferes with audio-visual experiences and wind noise impacts call quality. Equipped with active noise cancellation (ANC) technology, the product effectively blocks ambient noise. Combined with multi-microphone call noise cancellation and wind noise reduction mode, it ensures crystal-clear call clarity. Its lightweight design and stable wearing structure accommodate long-duration commuting needs. Additionally, select models support fast touch control for convenient switching between music and call modes, significantly enhancing travel convenience.

Advantages of Solution

Application Advantages
Excellent Audio Performance

It supports multiple audio coding and decoding formats, delivering a high-fidelity audio experience suitable for various scenarios such as music playback, calls, and gaming. Some chips also integrate noise suppression and echo cancellation technologies to further enhance audio quality.

Application Advantages
In-House Self-Developed Algorithms

Equipped with comprehensive in-house self-developed algorithms, supporting ANC/APT/RHA/AEC/NR/RCV-NN/EQ and other technologies.

Application Advantages
Low-Power Consumption Design

Adopting an advanced low-power architecture, some models support deep sleep mode and automatic wake-up functions. This enables true wireless stereo (TWS) earphones to further reduce power consumption while maintaining efficient audio processing capabilities, thereby extending the overall battery life.

Application Advantages
Stable and Reliable Connection

Based on the Realtek chip-based Bluetooth connection solution, the true wireless stereo (TWS) earphones boast excellent signal transmission and reception capabilities, ensuring a stable connection with Bluetooth-enabled devices. With an operating distance of over 15 meters, they support connection penetration through walls, featuring strong anti-interference performance and low disconnection probability.

Application Advantages
High Integration

The chip adopts a highly integrated design, incorporating built-in modules such as Bluetooth RF (Radio Frequency), baseband processor, audio DAC/ADC (Digital-to-Analog Converter/Analog-to-Digital Converter), and power management unit (PMU). This design helps simplify peripheral circuits, reduce the demand for external components, thereby minimizing PCB (Printed Circuit Board) size and overall device volume while effectively lowering the total cost.

Application Advantages
Rich and Diverse Functions

It supports Multi-link functionality, enabling simultaneous connection with two mobile phones and overcoming the limitation of traditional true wireless stereo (TWS) earphones that can only connect to one device at a time. Some solutions also feature gaming low latency, dual-microphone call noise cancellation, and transparency mode.

Application Advantages
Multi-Protocol Support

It supports multiple Bluetooth audio protocols including A2DP, AVRCP, and HFP, enabling compatibility with mainstream mobile phones and audio playback devices.

Application Advantages
Easy to Develop

Comprehensive development support and reference designs are provided, helping reduce development complexity and significantly shorten the time required for products to move from design to market.

Related Chips

Choose the SoC that suits your design requirements
RTL8763E & RTL8773ESL RTL8773E RTL8773D
MCU Real-M300 (CM33-like), 32-bit ARMv8M mainline processor@100MHz Real-M300 + FPU (CM33-like), 32-bit ARMv8M mainline processor@100MHz ARM Cortex-M4F@160MHz
DSP Tensilica HiFi mini@200MHz Tensilica HiFi mini@200MHz Tensilica HiFi mini@320MHz + Tensilica HiFi4@320MHz
Flash MCM 4MB/External External MCM 8MB/16MB
SRAM 532KB shared SRAM 800KB shared SRAM DSP + MCU total 3MB
Bluetooth Version Bluetooth 5.4 Bluetooth 5.4 Bluetooth 5.4
BLE Audio RTL8763EFL, RTL8763EAU, RTL8763EW-VP only Y Y
Max TX Power (BR) 10dBm 13dBm 12.5dBm
A-MIC Number ×3 ×2 ×4
D-MIC Number ×4 ×4 ×6
SPK/DAC Class D ×2 DAC out ×1 Class AB ×2 + Class D ×2
AUXADC 4 channels, 12bits 4 channels, 12bits 8 channels, 12bits
I2C ×3 Master/Slave mode. Max data rate at 400Kbps. ×3 Master/Slave mode. Max data rate at 400Kbps. ×3 Master/Slave mode. Max data rate at 400Kbps.
UART ×3 HW flow control. Max baud rate at 4MHz. ×3 HW flow control. Max baud rate at 4MHz. ×4 HW flow control. Max baud rate at 4MHz.
Operation Temperature -20~70°C -20~85°C -20~70°C
Operation Voltage 2.8~4.5V (VBAT) 2.8~4.5V (VBAT) 3~5V (VBAT)
Package (mm) QFN50, 4×6 QFN40, 4×6 QFN68, 7×7 aQFN76, 7×7 BGA149, 7×7 QFN68, 7×7 QFN88, 10×10 BGA184, 4.9×6
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