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Psychoacoustic ranking and selection using modified knockout tournaments.

Nils Meyer-Kahlen1, Petteri Hyvärinen1,2

  • 1Acoustics Lab, Department of Information and Communications Engineering, Aalto University, Espoo, Finland.

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Summary

Modified knockout (KO) tournaments efficiently rank samples in listening experiments, requiring fewer comparisons than traditional methods. This approach offers a promising, efficient alternative for psychoacoustic and psychophysical research.

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Area of Science:

  • Psychoacoustics
  • Psychophysics
  • Experimental Design

Background:

  • Psychoacoustic and psychophysical experiments often require numerous pairwise comparisons to rank stimuli.
  • Traditional round-robin (RR) designs, while thorough, can be inefficient in terms of the number of comparisons needed.
  • Efficient ranking methods are crucial for optimizing resource allocation in auditory perception research.

Purpose of the Study:

  • To introduce and validate a novel ranking and selection approach for psychoacoustic and psychophysical experiments.
  • To adapt sports tournament designs, specifically modified knockout (KO) tournaments, for identifying top-ranking samples with minimal comparisons.
  • To compare the efficiency of modified KO tournaments against traditional round-robin designs in a real-world listening experiment.

Main Methods:

  • Two variants of modified knockout (KO) tournaments were developed, inspired by computer science algorithms (tree selection sorting and replacement selection).
  • A listening experiment was conducted comparing binaural renderings of seven music halls based on loudness and reverberance.
  • Rankings from the modified KO tournament method were compared with those from a full round-robin (RR) design.

Main Results:

  • Modified KO tournaments required significantly fewer pairwise comparisons than the full RR design to identify top-ranking samples.
  • Simulations demonstrated the robustness of the KO tournament method across different parameters and data distributions.
  • The study confirmed the efficiency and effectiveness of the proposed modified KO tournament approach.

Conclusions:

  • Modified knockout (KO) tournaments offer a more efficient alternative to traditional round-robin designs for ranking samples in psychoacoustic and psychophysical studies.
  • The proposed method reduces the number of necessary comparisons, saving time and resources.
  • An open-source implementation is provided to facilitate the adoption of KO tournament designs in future research.