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Correcting low-frequency phase distortion in electroglottograph waveforms.

Martin Rothenberg1

  • 1Glottal Enterprises, Syracuse, New York, USA.

Journal of Voice : Official Journal of the Voice Foundation
|May 11, 2002
PubMed
Summary
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High-pass filtering below voice fundamental frequency minimally impacts EGG waveform amplitudes but can distort phase. Digital or analog methods can correct this distortion, even if filter characteristics are unknown.

Area of Science:

  • Speech Science
  • Bioacoustics
  • Signal Processing

Background:

  • Electromyography (EGG) waveforms are crucial for voice analysis.
  • High-pass filtering is used to reduce noise but can distort EGG signals.
  • Acoustic signal acquisition systems may unintentionally introduce high-pass filtering.

Purpose of the Study:

  • To analyze the impact of dynamic high-pass filtering on EGG waveforms.
  • To investigate methods for correcting phase distortion caused by high-pass filters.
  • To assess the effectiveness of digital and analog correction techniques.

Main Methods:

  • Simulated dynamic high-pass filtering with varying cutoff frequencies and filter orders.
  • Analysis of Fourier components (amplitude and phase) of EGG waveforms.

Related Experiment Videos

  • Development and testing of digital and analog compensation networks.
  • Utilizing square wave responses to characterize unknown filter parameters.

    • Main Results:

    • High-pass filters with cutoff frequencies significantly below the voice fundamental frequency (>=10x) have minimal amplitude impact.
    • Phase distortion significantly increases with lower cutoff frequencies and higher filter orders.
    • Both digital filter techniques and a simple analog network can effectively reduce phase distortion.
    • Square wave response allows for parameter adjustment of compensators for unknown filters.

    Conclusions:

    • Dynamic high-pass filtering below the voice fundamental frequency primarily causes phase distortion, not amplitude changes, in EGG waveforms.
    • Phase distortion is exacerbated by high-order filters and breathy voice quality.
    • Effective correction strategies, including analog methods, exist for high-pass filter-induced distortion in EGG signals.
    • A practical approach is presented for correcting distortion even when filter characteristics are not precisely known.