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  • Title: The difference between first and second harmonic amplitudes correlates between glottal airflow and neck-surface accelerometer signals during phonation.
    Author: Mehta DD, Espinoza VM, Van Stan JH, Zañartu M, Hillman RE.
    Journal: J Acoust Soc Am; 2019 May; 145(5):EL386. PubMed ID: 31153299.
    Abstract:
    Miniature high-bandwidth accelerometers on the anterior neck surface are used in laboratory and ambulatory settings to obtain vocal function measures. This study compared the widely applied L1-L2 measure (historically, H1-H2)-the difference between the log-magnitude of the first and second harmonics-computed from the glottal airflow waveform with L1-L2 derived from the raw neck-surface acceleration signal in 79 vocally healthy female speakers. Results showed a significant correlation (r = 0.72) between L1-L2 values estimated from both airflow and accelerometer signals, suggesting that raw accelerometer-based estimates of L1-L2 may be interpreted as reflecting glottal physiological parameters and voice quality attributes during phonation.
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