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Vocal effort is a quantity varied by speakers when adjusting to an increase or decrease in the communication distance. The communication distance is the distance between the speaker and the listener. Vocal effort is a subjective physiological quantity, and is mainly dependent on subglottal pressure, vocal fold tension and jaw opening.[1] Vocal effort is different from sound pressure. To measure vocal effort, listeners are asked to rate the distance between speaker and addressee.


  1. ^ Hartmut Traunmüller & Anders Eriksson (2000). "Acoustic effects of variation in vocal effort by men, women, and children". Journal of the Acoustical Society of America. 107 (6): 3438–3451. doi:10.1121/1.429414. PMID 10875388.