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Bluetooth Auracast™ Broadcast Audio Total Solution
Application Overview
Bluetooth Auracast™ Broadcast Audio Solution – Complete Integration, Ready for Deployment

Auracast™ is a breakthrough technology based on the Bluetooth LE Audio specification. It offers an efficient and convenient solution for public broadcasting and multi-device audio sharing, drastically transforming the way people interact with others and surrounding environment.
Realtek has launched a comprehensive solution that fully supports Auracast™ Transmitter, Receiver, and Assistant roles. This solution can assist customers in rapidly developing diverse products. In terms of technical implementation, the solution provides a wealth of interface options such as USB, Line-in, SPDIF, I2S, SPI, I8080, and QSPI, enabling flexible connections of various peripherals. It supports a variety of audio sources and display devices, capable of real-time, intuitive presentation of audio parameters and device status. At the same time, it offers convenient interactive operations, further enhancing user experience. With the high-performance MCU and powerful computing capability of the DSP, customers can rapidly and flexibly develop various Auracast™ applications, catering to diverse needs in various scenarios.

System Structure

The RTL87x3, as an Auracast™ Transmitter, supports a variety of audio inputs such as USB, Line-in, SPDIF, and microphone, and can also connect to external audio processors through interfaces like I2S and SPI. While transmitting one or more audio streams for real-time listening by Auracast™ Receivers, it simultaneously broadcasts device names, audio content, and codec configuration information for Auracast™ Assistant devices to view and select.

Application Structure

As an Auracast™ Assistant, the RTL87x3 supports a variety of interfaces such as I8080, QSPI, etc, enabling flexible connections with various screens for intuitive browsing and control operations. The device will actively scan broadcast packets from surrounding Auracast™ transmitters and display the scanning results in real-time. After the user chooses a target channel, the Auracast™ Receiver will receive and play audio based on the configuration parameters provided by the Auracast™ Assistant.

Application Structure

As an Auracast™ Receiver, the RTL87x3 sets up a connection with the Auracast™ auxiliary device and configures based on the user's selection in the interactive interface, achieving real-time reception and playback of the selected broadcast audio.

Application Structure

Application Scenario

Auracast™ broadcast audio application in the simultaneous translation of speeches
Application Scenario
Multi-language Simultaneous Interpretation

The Auracast™ simultaneous interpretation system is suitable for venues such as large lecture halls and conference centers, supporting audiences to receive translated content in real-time through personal Auracast™ Receiver devices. The system broadcasts the interpreter's voice through the Auracast™ Transmitter, and users can choose the language on the Auracast™ Assistant interface to directly listen to clear and smooth translated audio. This solution is also compatible with hearing aid devices, providing accessibility support.

Auracast™ broadcast audio application for tourist attractions
Application Scenario
Smart Tourism Systems

By integrating Auracast™ technology into smart tourism systems, the tour guide can use a portable transmitter to transmit high-definition explanation audio to tourists' Auracast™ Receiver devices in real time. This technology also supports deployment at specific locations, and tourists can choose to listen to the corresponding introduction content when they approach a specific scenic spot. The multi-channel broadcast function can transmit multi-language audio streams simultaneously, meeting the real-time personalized guide needs of tourists in different languages.

Auracast™ broadcast audio application in a fitness room
Application Scenario
Group Fitness Classes

In a group fitness scenario, instructors can use the Auracast™ Transmitter to synchronize and transmit upbeat music and real-time vocal instructions to students' Bluetooth headphones (Auracast™ Receivers). This technology creates an immersive training experience, achieves precise synchronization of action commands, and avoids the echo and delay issues of traditional sound systems.

Advantages of Solution

Application Advantages
Comprehensive Support for Auracast™ Transmitter, Receiver, and Assistant Roles

Supports all three operational modes-Auracast™ Transmitter, Receiver, and Assistant-enabling customers to flexibly design a wide range of product forms and implement complete Auracast™ application solutions.

Application Advantages
Rich Peripheral Interface Support

Offers a variety of audio input interfaces including USB, Line-in, SPDIF, and microphone, along with general-purpose digital interfaces such as GPIO, I2C, UART, and SPI, facilitating system expansion and feature integration.

Application Advantages
Powerful Display Capabilities

RTL87x3 provides excellent screen support, compatible with mainstream interfaces like I8080 and QSPI, allowing developers to easily connect and drive various displays. The bundled Honey GUI development framework further simplifies UI development, supporting multiple display modes and components to help build intuitive and dynamic graphical user interfaces.

Application Advantages
Battery Charging Management

Built-in lithium battery charging management module supports constant current charging mode with a maximum charge current of up to 300mA.

Application Advantages
Complete Development Toolkit

The Comprehensive SDK packages are provided, including sample code for Auracast™ Transmitter, Receiver, and Assistant roles, as well as mobile app SDKs and OTA upgrade tools—significantly lowering the development barrier and accelerating time to market.

Start Implementing My Bluetooth Auracast™ Broadcast Audio Total Solution Application

1
Define application requirements

Clarify functional and performance specifications of the software product through comprehensive analysis of target user demographics and market positioning, establishing clear guidelines for subsequent development.

2
Chip selection

Evaluate candidate ICs based on computational performance, power efficiency, cost-effectiveness, and supply chain reliability to pre-qualify key components for the Bill of Materials (BOM).

3
System architecture design

Design the software architecture with modular principles and interface protocols to ensure operational efficiency, maintainability, and scalability.

4
Hardware design

Collaborate with hardware engineers on circuit and PCB development, optimizing physical layout and thermal management while adhering to Design for Manufacturing (DFM) and assembly requirements.

Reference links: RTL8763E HDKRTL8773D HDKRTL8762G HDKRTL8773E HDK

5
Software development

Implement and optimize code on the hardware platform to guarantee functional completeness and system robustness, with provisions for maintainability and OTA update capabilities.

Reference links: RTL8763E SDKRTL8773D SDKRTL8762G SDKRTL8773E SDK

6
Testing & debugging

Conduct multi-level verification (unit/integration/system testing) to identify and resolve defects, ensuring final deliverables meet reliability benchmarks.

7
Prototype validation

Build engineering prototypes for scenario-based testing, collect user feedback for iterative refinement, and complete full-process validation prior to mass production.

Recommended Hardware
Choose the SoC that suits your design requirements
RTL8763EAU RTL8763EFL RTL8763EWE-VP
Application Auracast transmitter Auracast receiver Auracast assistant
Package (mm) QFN50 4x6 QFN40 4x6 QFN68 7x7
Protocol Legacy/BLE/LEA Legacy/BLE/LEA Legacy/BLE/LEA
Max MCU clock 100MHz 100MHz 100MHz
SRAM 578KB 578KB 578KB
MCM flash size 4MB 4MB N
MCM PSRAM size N N 4MB
USB Y N N
LCD interface N N I8080/QSPI
MIC resource 2A + 4D 3A + 4D 2A + 4D
Max GPIO number 12 9 38
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