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  • Title: Ambulatory monitoring of Lombard-related vocal characteristics in vocally healthy female speakers.
    Author: Whittico TH, Ortiz AJ, Marks KL, Toles LE, Van Stan JH, Hillman RE, Mehta DD.
    Journal: J Acoust Soc Am; 2020 Jun; 147(6):EL552. PubMed ID: 32611177.
    Abstract:
    Speakers typically modify their voice in the presence of increased background noise levels, exhibiting the classic Lombard effect. Lombard-related characteristics during everyday activities were recorded from 17 vocally healthy women who wore an acoustic noise dosimeter and ambulatory voice monitor. The linear relationship between vocal sound pressure level and environmental noise level exhibited an average slope of 0.54 dB/dB and value of 72.8 dB SPL at 50 dBA when correlation coefficients were greater than 0.4. These results, coupled with analyses of spectral and cepstral vocal function measures, provide normative ambulatory Lombard characteristics for comparison with patients with voice-use related disorders.
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