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Touchdesigner breath detection testing

Overview: This test is based on Hefan’s TD testing, focusing on refining the interaction between breath detection and visual output. The goal was to optimize microphone placement, enhance the sensitivity of airflow detection, and improve the overall experience of guided breathing. Key areas of experimentation included adjusting audio analysis parameters, refining the response to different breathing intensities, and ensuring smooth visual transitions.

Findings & Adjustments

Breath Sensitivity & Microphone Positioning

  • Issue: When blowing gently, the system did not detect sufficient airflow, resulting in weak visual feedback.
  • Solution: The microphone was found to be most sensitive when placed horizontally, 3-4 cm below the mouth. This position maximized airflow detection while minimizing background noise.
  • Next Steps: Implement a fixed microphone stand or position guide to ensure all participants use the optimal placement without manual adjustments.

 

Breath Decay & Visual Transition

  • Issue: During guided breathing (5s inhale, 5s exhale), the airflow naturally decreases over time. This caused a sudden drop in visual output, making the transition feel abrupt.
  • Solution: Adjust audio smoothing settings and refine the visual decay curve to create a more natural fade-out effect as breath weakens.
  • Next Steps: Experiment with lag filters and dynamic scaling to create a gradual transition when airflow weakens.

High-Frequency Sensitivity & Detection Consistency

  • Observation: The system responded to breath but not to spoken words, confirming that it effectively isolates airflow instead of voice.
  • Adjustment: The high-frequency range was the most responsive, while the low-frequency range was unnecessary for detecting breath.
  • Next Steps: Fine-tune gain and threshold settings to ensure consistent response across different breath intensities.

Next Steps & Refinements

  • Implement a fixed microphone position to avoid user adjustments.(Maybe put it within Installation)
  • Optimize audio analysis parameters to ensure smooth transitions when breath intensity decreases.
  • Conduct further tests to validate sensitivity across different users and refine visual-matching dynamics.
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