Bluetooth loudspeaker and mobile phone on table
girl in chat communication with wireless headphones
Pairing the smartphone with the car via Bluetooth

Communication and audio devices

From mobile phones and vehicle hands-free systems to speakers, conventional headphones and headsets, Bluetooth wireless technology can be found in nearly all communication and audio devices – albeit profiles, codecs, signal processing methods and more may differ.

But the aim is always the same: to give end customers the best-possible user experience thanks to high-quality audio playback and lossless communication between devices. Manufacturers have to ensure this by conducting a range of acoustic and electrical tests.

Optimizing Bluetooth voice quality

Realistically and reproducibly testing voice and audio quality via a Bluetooth connection poses a real challenge for manufacturers. The wireless connection of devices via Bluetooth can have a significant impact on both, communication and audio quality.

Manufacturers require special measurement procedures and a reference interface for ensuring key criteria:

  • Correct implementation of profiles, codecs and protocols for sink, source and gateway applications
  • Verification of levels, latency and transmission behavior
  • Optimization of signal processing depending on the application

In Focus:

  • Reference interface
  • Bluetooth profiles
  • Signal processing
  • Voice communication
  • Audio transmission
  • Narrowband and wideband
  • Compatibility
  • Conformity




Reproducible measurement and simulation procedures

The combination of a reference interface with test procedures for a range of Bluetooth-compatible audio and communication devices provides manufacturers and test laboratories with a unique test environment.

Our solutions enable lab-based testers to:

  • Establish a direction connection with the reference interface
  • Ensure compatibility and conformity among devices for all standard profiles and codecs (e.g. HFP, A2DP, Qualcomm® aptX™, mSBC)
  • Optimize signal processing (audio quality, level, echo compensation, noise suppression, etc.) where required
  • Ensure transparent and error-free transmission for gateway applications
  • Check the correct implementation of different connection types and associated protocols (e.g. AT commands such as “NREC Off”)
  • Test complex scenarios


Our team is ready to support you.
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