Vibrato rate and extent in soprano voice: A survey on one century of singing

This work presents a statistical study of vibrato parameters in soprano voices. More than one hundred recordings of the same tone sung by 75 artists have been analyzed. Vibrato rate and extent, tone length and intonation, together with their correlations are the main parameters under examination. The study shows a clear decrease of the mean vibrato rate during the last century (-1.8 +/- 0.3 Hz/century), together with an increase of vibrato extent (56.4 +/- 0.3 cent/century). Vibrato rate and extent show a statistically significant negative correlation (r = -0.62). Vibrato rate increase near the end of the tone has been observed too, in agreement with previous measurements, together with a mean increase of the pitch of the tone. A small positive correlation has been also found among note duration and vibrato extent. (C) 2011 Acoustical Society of America. [DOI: 10.1121/1.3621017]