A screening approach for classroom acoustics using web-based listening tests and subjective ratings

Area of Science:

• Educational Acoustics
• Psychoacoustics
• Environmental Psychology

Background:

• Classroom acoustics significantly impact speech perception, a critical factor for learning in educational settings.
• Evaluating classroom sound environments is essential for optimizing the learning experience.
• The relationship between speech comprehension, acoustic conditions, and student perceptions requires further investigation.

Purpose of the Study:

• To assess the efficacy of a web-based approach as a screening tool for identifying poor classroom acoustics.
• To investigate the correlation between students' speech comprehension, classroom acoustic qualities, and their subjective descriptions of the sound environment.

Main Methods:

• A web-based listening study involving 1106 pupils (aged 13-19) from 38 Swedish schools.
• Hagerman's sentences were used in four listening conditions: varying background noise and loudspeaker proximity.
• Pupil questionnaires on acoustic quality and teacher-provided classroom physical features were utilized.

Main Results:

• A significant negative impact of background noise and loudspeaker distance on speech comprehension was observed (p<0.001).
• Acoustic panels and classroom length were identified as physical features predicting speech comprehension (p<0.05, p<0.01).
• Pupil-reported 'clattery' sound quality correlated with reduced speech comprehension and understanding others (p<0.05).

Conclusions:

• The majority of classrooms exhibit suboptimal acoustic conditions, with many students reporting difficulties concentrating due to noise.
• Student-reported acoustic qualities, such as 'clattery' and 'noisy', are linked to specific learning challenges.
• Web-based listening tests and subjective acoustic descriptions offer a viable method for predicting classroom sound conditions.