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The Influence of CVT Metal and Density on Voice Directivity Patterns Across Two Octaves: A Double-Case Study
1Musical Acoustics Research Centre, Music and Dance Faculty, Academy of Performing Arts in Prague, Czech Republic.
Journal of Voice : Official Journal of the Voice Foundation
|January 23, 2026
Summary
Vocal directivity is influenced by "metal" and "density" parameters in singing, affecting sound radiation patterns. These findings offer new insights for voice training and performance acoustics.
Area of Science:
- Acoustics
- Vocal Pedagogy
- Music Performance
Background:
- Spatial characteristics of voice radiation are underexplored in vocal performance and pedagogy.
- Previous research focused on spectral and glottal correlates, neglecting directional sound energy distribution.
- This study builds on Complete Vocal Technique (CVT) to investigate perceptual parameters influencing voice directivity.
Purpose of the Study:
- To explore how perceptual parameters of metal and density influence voice directivity patterns.
- To analyze spatial radiation across different vocal modes and stylistic contexts within the CVT framework.
- To identify singer-specific differences in spatial radiation related to vocal technique variations.
Main Methods:
- A double-case study involving two professional singers (one male, one female).
- Recording of 1088 sustained phonation samples across four CVT vocal modes with varied metal and density settings.
- Analysis of directional sound radiation using microphone arrays, front-back ratios, spectral tilt, directivity indices, and factor analysis.
Main Results:
- Singer-specific differences in spatial radiation patterns were observed, linked to variations in metal and density.
- Forward-focused radiation (2-5 kHz) was noted in Overdrive and Edge modes with full metal and density.
- Classical productions showed broader low-frequency radiation (0-2 kHz), while contemporary styles were more directional.
Conclusions:
- Variations in "metal" and "density" significantly alter three-dimensional vocal radiation beyond pitch and loudness.
- Spatial acoustics offers a valuable extension to the CVT framework for voice training and performance.
- Novel parameters for quantifying vocal radiation are proposed for applied settings like voice training and immersive audio.
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