Utterance behavior varies by person or by place. Few papers have been published on its nature of those who are heavily using their voice, including teachers, singers, telephone operators and salesmen, or even people in general.
It is often found that many of patients complaining of voice disturbance use theirvoice excessively. Quantitative data on total of speeking time in a day, speeking time ratio per hour and distribution of sound pressure level and frequency during speech will help us to comprehend speeking behavior of each case and to evaluate the relations between cause of voice disturbance and utterance behavior. A portable device to record uttering time for 24 hours was invented for those purposes. Its usefulness was described.
