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Research has reported on the use of soundfield amplification devices in the classroom. However, no study has used standardized tests to determine the potential advantages of the dynamic soundfield system for normally hearing students and for the teacher's voice. Our aim was to evaluate the impact of using dynamic soundfield system on the noise of the classroom, teacher's voice and students’ academic performance. This was a prospective cohort study in which 20 student participants enrolled in the third year of basic education were divided into two groups (i.e., control and experimental); their teacher participated. The experimental group was exposed to the dynamic soundfield system for 3 consecutive months. The groups were assessed using standardized tests to evaluate their academic performance. Further, questionnaires and statements were collected on the participants’ experience of using the soundfield system. We statistically analyzed the results to compare the academic performance of the control group with that of the experimental group. In all cases, a significance level of P < .05 was adopted. Use of the dynamic soundfield system was effective for improving the students’ academic performance on standardized tests for reading, improving the teacher's speech intelligibility, and reducing the teacher's vocal strain. The dynamic soundfield system minimizes the impact of noise in the classroom as demonstrated by the mensuration of the signal-to-noise ratio (SNR) and pupil performance on standardized tests for reading and student and teacher ratings of amplification system effectiveness.

The theme of this study was to evaluate the effect of the dynamic soundfield system in one period of the day, the teacher's vocal symptoms and voice quality in the classroom. A case relate of a teacher of 44 years who served in the role for 23 years, and taught in the same room in the morning and afternoon. The teacher used the dynamic soundfield system during one of the periods of the day for about three months. Daily evaluation was carried out of the occurrence of symptoms in the vocal tract, and their intensity before and after school; perceptual and acoustic analysis of voice before and after the observation period, and applying a self-perception questionnaire about the use of dynamic open field system, the end of the observation period. The data were analyzed descriptive and by the Wilcoxon test (p=0.05). There was a decrease in the intensity of the symptom "dryness" to the end of class, and lower incidence of vocal symptoms with the use of dynamic soundfield system, as well as improvement in perceptual and acoustic parameters of the voice after a period of observation and reporting of positives by the teacher on the use of dynamic soundfield system. In the case study, the use of dynamic soundfield system, one of the periods of the day, was effective in reducing symptoms and improvement in perceptual voice quality and acoustics. Keywords: Amplifiers, Electronic; Signal-To-Noise Ration; Occupational Health; Educational Technology; Voice RESUMO Este estudo teve como tema avaliar o efeito do sistema de campo livre dinâmico, em um período do dia, nos sintomas vocais e na qualidade vocal de uma professora em sala de aula. Relato de caso clínico de uma professora de 44 anos, que atuava na função há 23 anos, e lecionava na mesma sala no perí-odo matutino e vespertino. A professora utilizou um sistema de amplificação em campo livre dinâmico durante um dos períodos do dia por aproximadamente três meses. Foi realizada avaliação diária da ocorrência dos sintomas no trato vocal, e da intensidade deles antes e após a aula; análise perceptivo-auditiva e acústica da voz antes e após o período de observação, e aplicação de um questionário de autopercepção sobre o uso do sistema de campo livre dinâmico, ao final do período de observação. Os dados foram analisados descritivamente e por meio do teste de Wilcoxon (p=0,05). Observou-se diminuição da intensidade do sintoma "secura" ao final da aula, e menor ocorrência de sintomas vocais com a utilização do sistema de campo livre dinâmico, além de melhora em parâmetros perceptivo-auditivos e acústicos da voz após o período de observação, e do relato de pontos positivos pela professora quanto ao uso de sistema de campo livre dinâmico. No caso estudado, o uso do sistema de campo livre dinâmico, em um dos períodos do dia, foi efetivo na diminuição dos sintomas e na melhora na qualidade vocal perceptivo--auditiva e acústica.

Introduction:In the school environment, teachers feel uncomfortable when teaching in noisy classrooms and realize the difficulty of students in hearing the information, what makes the noise, not just an annoyance, but also an aggravating factor that interferes with school performance. Therefore, appropriate acoustic conditions to the educational environment are indispensable. Currently, there is no standardization of the methodology that should be used to measure the acoustic characteristics of classrooms. Purpose: Translating and adapting into Brazilian Portuguese the "Classroom Acoustical Screening Survey Worksheet" protocol. Methods: The translation and adaptation of the protocol have included the translation into Portuguese, linguistic adaptation, and grammar and idiomatic equivalences revision, as well as the content validation by means of two steps: individual evaluation and meeting of specialists. Results: The protocol was translated and adapted into Portuguese. The protocol presented content validity, and after the appreciation and consensus of the experts, it was showed that the cultural adaptation of content was evident and objective, making possible to apply it in Brazilian classrooms. Conclusion: "Classroom Acoustical Screening Survey Worksheet" protocol was translated and adapted into Brazilian Portuguese, and named "Planilha de triagem acústica da sala de aula." Further studies should investigate its applicability and effectiveness in observing the acoustic characteristics of the classroom in the national scenario.