Correlation between measured and perceived impact sound in schools

Sammanfattning: This project investigated the correlation between measured impact sound insulation and perceived walking sound annoyance in schools. The correlation was tested by performing standardized impact sound insulation measurements for different floor structures and comparing the measurement results with subjective perception of recorded walking for the same floor structures. Subjective perception of walking sound was evaluated by performing listening tests based on the recorded walking sounds. Five structures were tested, four different CLT structures and one concrete structure. The objective was to determine the significance of the frequencies below 100 Hz for perceived walking sound annoyance and to investigate whether the inclusion of frequencies below 100 Hz in the evaluation of impact sound insulation would improv the correlation between measured and perceived impact sound. The results from the listening tests showed that the rated walking sound annoyance for the structures did not correlate to the structures’ measured impact sound insulation. For example, the structure with the worst impact sound insulation was not rated the worst from the listening tests. Improvements to the correlation between measured and perceived impact sound were seen when the impact sound insulation was evaluated from 25 Hz, but the correlation was still not fully satisfactory.