ON THE REQUIREMENTS ON THE F_(PI) INDICATOR WHEN DETERMINING EMISSION SOUND PRESSURE LEVELS USING SOUND INTENSITY

摘要

Concerning the A-weighted estimations, all the errors are less than 2dBA. The traditional pressure method, according to ISO 11204, fixes the highest value of the reproducibility standard deviation to 2.5dBA, for engineering degree, and the expected highest value to 5dBA for survey degree. Specifications about frequency bands are not provided. The intensity method presents, in all the situations, a better accuracy, with errors under 2dBA. Looking at the frequency band results, very different tendencies are observed, but not very big errors. Only in particular cases, errors higher than 2.5dB are found. Frequency band analysis is fundamental, because the A-weighted value tendencies are not representative. And also, because is not possible to have indicators associated with the dBA value with a physical meaning.