The concept of “good acoustics” is a combination of subjective and objective acoustic parameters. The relevant parameters can be obtained using measurements or with numerical and analytical calculation. Real-time analysis allows the whole spectrum of a sound to be analyzed and to consider several parameters simultaneously.

To determine the sound fields and reverberation times in a selected classroom, in situ measurements were performed. Pink noise was generated from speakers and measurements were carried out using sound level meter. The sound source was located on the usual teacher’s position, centrally in relation to the width of the room and 11 measurement positions were used to register the sound.

To expand the information of the classroom acoustics, analytical and numerical analyses were carried out. Room modes were obtained using both analytical and numerical calculation, in order to see how they interact with the generated sound fields. For the low frequencies, FEM Pressure Acoustics Analysis in Frequency Domain Module was performed and for high frequencies, Geometric Acoustics – Ray Tracing method was used. Numerical analyses were conducted using the multiphysics software COMSOL.

The pronounced reflective nature of all constituent surfaces of the room is the main problem. This can be confirmed by the extremely large values of the reverberation time. To achieve satisfactory acoustics, sound absorbing materials is required.