The intelligibility of speech of teachers is an important part of successful learning. In classrooms, windows and smooth surfaces, such as walls, ceilings and tables, reflect the spoken word.
These reflections can have a positive influence on speech intelligibility. For example, for the students in the rows further back, it is the reflections which boost the intelligibility. Without them, the teacher would be without a voice after the first day. Only when there are too many reflections does it become a problem.
Decisive for good speech intelligibility in such an environment is:
- Reflections should support the speaker's voice
- Background noise should be sufficiently attenuated.