Developing Smart Microphone Production Test System: How We Helped Our Client Launch to Market

After completing the full development, from initial idea to final product, one critical step remained before it could reach the market: ensuring that every single unit met the same high standards as the prototype.
For a product aimed at professional audio markets, even a small number of defective units could quickly escalate into costly returns and reputation damage.

Initial Challenge

As production volumes increased, the client aimed to scale.

Their then‑current manufacturing partner relied on random sample testing (a few devices per batch), which led to a higher number of failures and product returns from the field.
This affected the product’s time-to-market. Delays in scaling were becoming inevitable, and there was a growing risk of inconsistent devices reaching customers.

Facing these risks, they turned to us for a solution.

Our contribution

To solve this, we designed and implemented a comprehensive test system consisting of:

  1. Custom Test Firmware

    • Automated diagnostics:
      • Board boot up
      • Communication between MCU and peripherals
      • Power supply check and battery check
      • UBS communication
      • Storage memory integration check
      • DSP validation,
      • Checking all microphones
      • Frequency response on stereo microphone check
      • Bluetooth module check
      • Logging test data to memory and transfer to PC via BLE
      • Automatic configuration device (serial number, color, stereo offset, etc.)
  2. PC Application
    • Communicates with up to six devices simultaneously via BLE
    • Controls a sound-isolated test chamber
    • Controls test sequences and collects test data from devices via BLE

     
    These enabled:

    Comprehensive Audio and Hardware Testing

    • Pink noise measurement
    • Fake background noise detection
    • Sinusoidal response analysis
    • Stereo offset verification

    Data Logging and Traceability

    • Results stored locally on the device
    • Real-time results on PC display
    • Ensures traceable production test data for every unit

    Integrated Production Flow

    • Pass/fail visual interface with serial number identification
    • Automated firmware flashing, serial number assignment, and label printing
    • Supports ICT (In-Circuit Test) for PCBs and FCT (Functional Circuit Test) for assembled devices

Results

This test system was critical for moving from prototyping to mass production.

It allowed our client to:

  • Move from prototype to mass production without redesign
  • Maintain 100% unit traceability and repeatable testing conditions
  • Minimize operator errors with automated pass/fail indicators
  • Adapt quickly to new SKUs thanks to updatable firmware parameters
  • Speed up debugging and product evolution by reusing the BLE logging tool during development

Conclusion

Without a robust production test solution, scaling is high-risk.
With the right system, you can ramp up production, protect product quality, and reach the market faster.

That’s why our team treats production test development as a critical part of the product lifecycle, ensuring that your innovation reaches customers at the same quality you designed it for.