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Auditory profile analysis of harmonic signals
J Zera1, Z A Onsan, Q T Nguyen
1Psychology Department, University of Florida, Gainesville 32611.
The Journal of the Acoustical Society of America
|June 1, 1993
Summary
This study investigated spectral shape discrimination for harmonic complex sounds. Thresholds increased with frequency, but corrected thresholds showed a consistent shape, similar to sounds with logarithmically spaced components.
Area of Science:
- Auditory perception
- Psychoacoustics
- Signal processing
Background:
- Spectral shape discrimination is crucial for understanding complex sound perception.
- Harmonic complexes are fundamental building blocks of many natural sounds.
Purpose of the Study:
- To investigate spectral shape discrimination for harmonic complexes.
- To examine how fundamental frequency and component spacing affect discrimination thresholds.
Main Methods:
- Two sets of experiments were conducted using harmonic complexes with varying fundamental frequencies (100, 200, 400 Hz).
- Signal detection thresholds were measured for increments in single components.
- Data were transformed using a critical band analysis to account for masking effects.
Main Results:
- Thresholds increased significantly with signal frequency (1000-5000 Hz).
- Corrected thresholds exhibited a bowl-shaped pattern, consistent with stimuli having components equally spaced on a logarithmic frequency scale.
- Results were similar to those found for logarithmically spaced components, even with local masking.
Conclusions:
- Spectral shape discrimination of harmonic complexes follows similar principles to stimuli with logarithmically spaced components.
- Critical band analysis effectively normalizes thresholds across different spectral configurations.
- Auditory system processing of spectral shape is robust to variations in component phase and number.