On the Duifhuis pitch effect

Area of Science:

• Auditory Perception
• Psychoacoustics
• Signal Processing in Hearing

Background:

• The Duifhuis effect describes the perception of an audible pitch from an omitted high harmonic in a periodic complex tone.
• Traditional explanations attribute this effect to peripheral auditory filters and short-term frequency analysis.
• The effect's applicability to broadband signals and its underlying mechanisms require further investigation.

Purpose of the Study:

• To extend the Duifhuis effect to new broadband signal conditions.
• To investigate the role of signal phase in the generation of the missing-fundamental pitch.
• To challenge and refine the traditional explanation of the Duifhuis effect.

Main Methods:

• Experiments were conducted using periodic complex tones with flat and 6 dB/octave decreasing spectra.
• Various phase conditions, including constant, alternating, and Schroeder phases, were tested.
• Pitch and loudness matching experiments were performed, alongside experiments with narrower bands.

Main Results:

• The Duifhuis effect was confirmed for flat and 6 dB/octave spectra, independent of constant phase conditions.
• The effect was observed with alternating and Schroeder phases, generating a missing-fundamental pitch.
• Narrowband experiments indicated that peripheral auditory filters alone are insufficient, suggesting a role for phase information integration across channels.

Conclusions:

• The Duifhuis effect is robust across various broadband signal types and phase configurations.
• The perception of a missing fundamental relies on more than just peripheral frequency analysis.
• Auditory processing likely involves combining information from different peripheral channels while preserving phase information.