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Characterization of Source-Filter Interactions in Vocal Vibrato Using a Neck-Surface Vibration Sensor: A Pilot Study.

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Summary
This summary is machine-generated.

Vocal vibrato involves periodic modulation of voice signals. This study found intensity modulation rates differ between source signals (neck sensor) and filtered signals (microphone), varying by vowel. This supports resonance-harmonics interaction in vocal vibrato.

Keywords:
ModulationSource-filterVibrato

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Area of Science:

  • Acoustics and phonetics
  • Physiology of voice production
  • Singing technique analysis

Background:

  • Vocal vibrato is a singing technique involving periodic modulation of fundamental frequency (fo) and intensity.
  • The physiological mechanisms and acoustic interactions within the vocal tract during vibrato are not fully understood.

Purpose of the Study:

  • To investigate if neck-surface vibration sensor and microphone signals can capture differences in vibrato modulation rates and extents.
  • To compare source (pre-filter) and filtered (post-filter) vocal signal characteristics during vibrato.

Main Methods:

  • Nine classically-trained singers produced sustained vowels with vibrato.
  • Simultaneous recordings were made using a neck-surface vibration sensor and a microphone.
  • Acoustical analyses measured modulation rates and extents, with paired-samples sign tests for comparisons.

Main Results:

  • Fundamental frequency (fo) modulation rate and extent were similar between sensor and microphone signals.
  • Intensity modulation extent was equivalent, but its rate was significantly higher in microphone signals compared to sensor signals.
  • Greater differences in intensity modulation rate occurred with vowels having smaller formant frequency differences.

Conclusions:

  • The rate of intensity modulation after vocal tract filtering (microphone) is higher than at the source (neck sensor), varying with vowel type.
  • Findings support the role of resonance-harmonics interaction in vocal vibrato.
  • Further research is needed to explore physiological sources and inconsistent intensity modulation extents.