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      Investigations into vocal doses and parameters pertaining to primary school teachers in classrooms.

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          Abstract

          Investigations into vocal doses and parameters were carried out on 40 primary school teachers (36 females and 4 males) in six schools in Italy, divided into two groups of three, A and B, on the basis of the type of building and the mid-frequency reverberation time in the classrooms, which was 1.13 and 0.79 s, respectively. A total of 73 working-day samples were collected (66 for females and 7 for males), from which 54 traditional lessons were analyzed separately. The average value over the working days of the mean sound pressure level of the voiced speech at 1 m from the teacher's mouth was 62.1 dB for the females and 57.7 dB for the males, while the voicing time percentage was 25.9 and 25.1 %, respectively. Even though the vocal doses and parameters did not differ for the two school groups, the differences in the subjective scores were significant, with enhanced scores in group B. A 0.72 dB increase in speech level per 1 dB increase in background noise level, L(A90), was found during traditional lessons, as well as an increase in the mean value of the fundamental frequency with an increase in L(A90), at a rate of 1.0 Hz/dB.

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          Author and article information

          Journal
          J Acoust Soc Am
          The Journal of the Acoustical Society of America
          Acoustical Society of America (ASA)
          1520-8524
          0001-4966
          Apr 2012
          : 131
          : 4
          Affiliations
          [1 ] Politecnico di Torino, Energy Department, Corso Duca degli Abruzzi, 24, 10129 Torino, Italy. pasqualebottalico@yahoo.it
          Article
          10.1121/1.3689549
          22501060
          df844965-cb58-414d-8d79-c16e600a0261
          History

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