Crowd noise and vocal power level in large college canteens in China

Both the noise and vocal power level of crowd are parameters for evaluating acoustic environment. The former is from perspective environment, latter user's needs. This paper aims to explore diners in large college canteens China. Measurements were conducted two typical Chinese canteens. Videos also recorded analyse diners’ behaviour. results showed that varied 61 dBA 73 during meal. It was noted although had a strong correlation with number occupants, relationship between this not simply superposition equal-intensity sound sources. speaking ratio Lombard effect played significant role average 0.12, which far less than practical value, 1/3. A prediction model under introduced into canteens, considered direct reverberant energy using room information, location diners, ratio. Based on model, found vary 59 97 dBA. According Pearson's evaluation criterion, 17.1% data fell “Raised” “Loud”, 71.8% “Loud” “Shout”. indicated impact communication some treatment necessary.