LE Audio CAP

CAP

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Common Audio Profile -- builds on BAP to define common audio procedures like coordinated set handling.

    


    
    
    

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      Common Audio Profile
      
    

    
  


  




  
  

    
Common Audio Profile (CAP)


CAP (Common Audio Profile) extends BAP (Basic Audio Profile) with coordinated audio procedures -- primarily the management of Coordinated Sets, which are groups of related audio devices such as a pair of stereo earbuds or a set of hearing aids.


Purpose


While BAP defines how to set up individual audio streams, CAP addresses the question of coordination: how does a phone know that two earbuds belong together, and how does it configure them as a stereo pair with synchronized timing? CAP answers this by defining the Coordinated Set Identification Service (CSIS), which allows devices to advertise their group membership.


Coordinated Sets


A Coordinated Set is a group of devices that should be treated as a unit. Each device in the set shares a Set Identity Resolving Key (SIRK), which allows a Central to identify set members even when they use LE Privacy rotating addresses.


Typical coordinated set scenarios include:


    

  • True wireless stereo earbuds: Left and right earbuds form a set; the phone opens two CIS streams with correlated timing
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  • Binaural hearing aids: Left and right hearing aids coordinate audio processing parameters
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  • Surround sound: Multiple speakers configured as a multi-channel set
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Initiator and Acceptor Roles


CAP defines two roles:


    

  • Initiator: The device that discovers and configures the Coordinated Set (typically a phone or hub). The Initiator uses CSIS to resolve set members, then uses BAP procedures to configure streams on each member
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  • Acceptor: A member of the Coordinated Set (earbud, hearing aid). The Acceptor implements CSIS and ASCS to allow the Initiator to discover and configure it
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Relationship to Other Profiles


CAP is the common foundation for application-specific profiles. The Hearing Access Profile (HAP) builds on CAP for hearing aid use cases. The Telephony and Media Audio Profile (TMAP) uses CAP for phone call and music streaming scenarios. By providing a shared coordination layer, CAP ensures interoperability across different LC3 codec and Auracast." data-category="LE Audio">LE Audio application domains.

  

  

  
  
  




  
  
Related Terms

  

  

    
    LE Audio
    
    BAP
    
  





  

  
  

  
  

  
  
  

    
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…start/stop streams dynamically without disconnecting. The CAP (Common Audio Profile) sits above BAP and coordinates…

        
      
      
    

  

  

  
  




  
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Our glossary covers 90+ BLE technical terms organized by category. Each term includes a definition, related terms, and links to relevant chips and guides.