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Room acoustic measurements can be improved by averaging repeated room impulse responses (RIRs). A new time-stretching method corrects for time-variance caused by temperature changes, enhancing signal-to-noise ratio (SNR).

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Area of Science:

  • Acoustics
  • Signal Processing
  • Architectural Acoustics

Background:

  • Room acoustic measurements commonly use averaging of repeated room impulse responses (RIRs) to improve signal-to-noise ratio (SNR).
  • This averaging assumes a time-invariant system, but environmental factors like temperature fluctuations can introduce time-variance.
  • Such time-variance was observed during measurements at the Paris Notre Dame cathedral, leading to inaccurate reverberation time results.

Purpose of the Study:

  • To address the confounding effects of time-variance in room acoustic measurements.
  • To propose and validate a correction method for time-varying acoustic systems.
  • To improve the accuracy and reliability of reverberation time measurements.

Main Methods:

  • A novel time-stretching method was developed to correct for acoustic system time-variance.
  • The proposed method was applied to room impulse responses (RIRs) affected by temperature changes.
  • Corrected RIRs were averaged, and reverberation times were compared to expected ranges.

Main Results:

  • The time-stretching correction method effectively compensated for system time-variance.
  • Averaged RIRs, after correction, yielded reverberation times within expected tolerance ranges.
  • An 8 dB signal-to-noise ratio (SNR) gain was observed in the mid-frequency range post-correction.

Conclusions:

  • The proposed time-stretching method is a viable solution for correcting time-variance in room acoustic measurements.
  • Accurate reverberation time measurements can be achieved even in the presence of environmental fluctuations.
  • The method enhances measurement reliability and improves SNR, crucial for detailed acoustic analysis.