Santarpia L., Gelfù A.

This job is an evaluation of the clarity of the spoken in university classrooms, particularly the transmission index of the spoken in the classroom of the Department of Technical Physics of the Faculty of Engineering of the University 'La Sapienza' of Rome has been valued. Acoustic measures, according to the indications of the norm ISO 3382:1997, the sound pressure level values, the EDT values and the reverberation time values in octave band have given, further the energetic relationships between early/late reflections, and the central time values have given. The measured values have been compared with the law limits of the scholastic environments, brought by German norm DIN 18041:2004-05 'Hörsamkeit in kleinen bis mittelgrossen Räumen” (Audibility in small spaces and of average greatness) and by Italian standard DM 18/2/1975. The SGA-SSA (Society Switzerland of Acoustic) have an own directive founded on the same German standard. By the software 'Odeon B&K', the acoustic field and the values of the acoustic parameters of the classroom of the Department of Technical Physics have been calculated. Verified the result of the simulation, it has been proposed an acoustic correction for conforming the classroom to the European standards.