Pleasant and unplasant characteristics in wind turbine sounds

摘要

Background and aim: Noise annoyance in areas or at times when the background level is low, may be related to intrusive acoustical characteristics in wind turbine sounds. In this study one of the most noticeable and annoying (1) psycho-acoustical descriptors "lapping" was evaluated. Methods: With the object to obtain a pleasant sound, a total of 24 subjects varied four parameters related to the perception of "lapping". The variations of the parameters were carried out with a constant dBA level using an interactive sound processing system. Results: The adjusted value of three of the four parameters was significantly different from the default parameters in the original sound. The changes of perceived pleasantness of the sound could not be detected by the frequency spectra analysis, but some differences were detected using psycho-acoustical analysis (2), especially specific loudness versus time.