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Bluetooth® LE Audio Now Available for Blue SDK 7

Why Hypervisor Technology

OpenSynergy’s Blue SDK is one of the market’s most mature and feature-complete Bluetooth stacks. Continually enhanced over the years, it has approached nearly 25 years of development by the same core development team.  This deep protocol knowledge and expertise continue to make Blue SDK the preferred choice for demanding industries such as Automotive, Medical, and Industrial. The latest version, Blue SDK 7, supports a full suite of brand-new LE Audio profiles and the LC3 audio codec available for license. LE Audio brings an entirely new audio architecture to Bluetooth. These new LE Audio Profiles begin the transition away from the legacy Classic Audio profiles such as A2DP, AVRCP, HFP, HSP, etc. Implementing LE Audio marks a significant milestone in carrying forward a long legacy of excellence into next-generation Bluetooth devices. 

What is special about Blue SDK

  • Industry-leading Bluetooth solution for 20+ years
  • Proven for automotive and other requirements across many different operating systems
  • Hardware agnostic and designed for embedded systems with restricted MIP’s and memory
  • Rich set of flexible APIs, macros, & utilities, extendable to add features & functionalities
  • Flexible architecture by clear abstraction of platform-specific code
  • Complete control over all aspects of stack operation prior to compilation & during run time
  • Audio integration of ALSA, PulseAudio, gStreamer, supporting third-party codecs


The new codec in the latest version of Blue SDK, called LC3, makes it possible to stream audio over Bluetooth Low Energy (LE), providing improved audio quality at roughly half the bitrate compared to the traditional Bluetooth audio codec. Additionally, highly synchronized audio streams can be shared across multiple receiving devices via Multi-Stream Audio and Broadcast Audio. Blue SDK v7 is ready for immediate integration.



Multi-stream audio allows for multiple synchronized audio streams between an audio source device and one or more receiving devices. For example, a single smartphone can send an independent stream of the Left channel to one Bluetooth speaker and independent stream of the Right channel to another Bluetooth speaker.  Both speakers work together as a single system to play stereo audio. 


Broadcast Audio enables an audio source device to broadcast one or more audio streams to many receiving devices. This new topology is referred to as “Audio Sharing.”  It is useful for broadcasting audio within public venues as well as sharing audio from the same audio source device with friends.

Completely new Bluetooth profiles, such as Telephony and Media Audio Profile (TMAP), define interoperable support for both telephony and media audio compared to the Classic Audio profiles such as A2DP for media streaming, AVRCP for media controls, and HFP for telephony. This is in contrast to the profiles in the Classic Audio architecture, which cover many functionalities redundantly. The new profile architecture for LE Audio consolidates functionality into smaller underlying profiles that can be reused across use cases.  Additionally, LE Audio and the new LE Dynamic Power Control can reduce power consumption and optimize signal strength.

For a full list of LE Audio Profiles and technical information, read more about Blue SDK.

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    Whitepaper Bluetooth Low Energy

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