Solutions > Bluetooth Audio Transmitter and Receiver Solution

Solution Background

Realtek introduces a comprehensive Bluetooth Audio Transmitter and Receiver Solution compliant with the Bluetooth® Core Specification v5.4, supporting both Classic Bluetooth (BR/EDR) and Bluetooth Low Energy (BLE). This solution integrates a rich array of input/output peripheral interfaces — including MIC, USB, Line-in, SPDIF, SDIO, SPI, and I2S — significantly expanding its application potential. Powered by a high-performance MCU and DSP, the system flexibly manages wired and wireless connections while efficiently processing audio algorithms. This architecture is designed to meet the diverse requirements of wireless audio transmission and intelligent voice interaction.

System Structure

Bluetooth Audio Transmitter

The solution can be configured as a robust Audio Transmitter. It supports audio input via interfaces such as USB, SDIO, MIC, Line-in, SPDIF, and SPI/I2S, allowing seamless connection to external audio sources like televisions, computers, or stereo systems. The transmitter captures these signals and streams them wirelessly to receiving devices such as Bluetooth headphones or speakers.

In wireless audio transmission scenarios, the transmitter supports multiple roles:

• A2DP Source: Streams high-quality stereo audio to Bluetooth headphones.
• HFP Audio Gateway: Facilitates voice communication via SCO/eSCO links.
• LE Audio:
  • As a Broadcast Source, it supports the Auracast™ Transmitter role to create Broadcast Isochronous Streams (BIS) for "one-to-many" public audio sharing. It also supports the Auracast™ Assistant role to help Auracast™ Receivers synchronize with broadcast streams.
  • Unicast Audio: As a Unicast Client, it establishes Connected Isochronous Streams (CIS) to provide low-latency, high-quality "one-to-one" audio transmission.

Bluetooth Audio Receiver

The solution can also be configured as an Audio Receiver. It is capable of receiving signals from audio transmitters and supports a variety of audio I/O interfaces, including MIC, Speaker driver, and SPI/I2S.

As a receiver, it implements diverse functional roles:

• A2DP Sink: Receives and plays back high-quality stereo audio streamed from mobile phones or other sources.
• HFP Hands-Free: Enables voice communication via SCO/eSCO links.
• LE Audio:
  • Broadcast Audio: As a Broadcast Sink, it supports the Auracast™ Receiver role, capable of scanning for and synchronizing with BIS broadcast streams for playback.
  • Unicast Audio: As a Unicast Server, it receives and plays back CIS audio streams.

Application Scenarios

The Bluetooth audio transmitter and receiver solution is widely applicable to a diverse range of wireless audio interaction scenarios.

Bluetooth Speaker

This solution enables the reception of audio streams via Bluetooth, facilitating seamless connectivity and playback between mobile devices and home audio systems.

TV/Set-Top Box Wireless Audio

The solution extracts audio via the SPDIF interface and transmits it over Bluetooth to headphones or speakers, enabling a wireless audio experience for home entertainment systems.

Automotive Audio Systems

By pairing with mobile devices via Bluetooth and integrating with automotive peripherals through IO interfaces, this solution combines multimedia entertainment with hands-free calling functionality.

Multi-Language Audio

In venues such as conference centers or gyms, this solution can transmit multilingual audio streams via Bluetooth Auracast™ technology, allowing users to autonomously select and listen to specific language channels through their headphones.

Electronic Stethoscopes & Amplification Devices

Capable of capturing weak signals via a microphone and amplifying the output through a local speaker, this solution achieves precise capture and real-time playback of subtle sounds.

Solution Advantages

1. Comprehensive Interfaces & High Expandability

   Natively supports a full spectrum of audio interfaces — including MIC, USB, Line-in, SPDIF, SDIO, SPI, and I2S — ensuring seamless hardware integration and adaptation without limitations.

2. Powerful Computing & Rapid Response

   A high-performance MCU and DSP work in synergy to effortlessly handle concurrent multi-tasking and complex audio algorithm processing with ease.

3. Dual-Mode Leadership

   Fully supports both Classic Audio and LE Audio, perfectly balancing backward compatibility for legacy markets with the low-power, low-latency advantages of next-generation technology.

4. Flexible Architecture for Versatile Scenarios

   A single solution that can be dynamically configured as a transmitter, receiver, or transceiver (single-chip or dual-chip modes), significantly broadening the possibilities for product definition.

5. Comprehensive SDK for Fast Time-to-Market

   Includes a fully functional SDK packed with rich product prototypes, mobile APP SDKs, and OTA tools. This significantly lowers development barriers and accelerates your product's journey to the market.

For more details, please visit: Dual Mode Bluetooth Microcontroller.