Abstract
The authors have been developing a new type of noise barrier, ASE (Actively controlled acoustical Soft Edge) noise barrier. A prototype of ASE noise barrier with a length of 40m was erected along the test track of PWRI. Its noise reduction effects against a fixed noise source were 2-6 dB larger than that of the ordinary noise barrier, depending on the positions of the receiving points. Furthermore, its effect against a running heavy truck, at the speeds of 40 km/h and 80 km/h, was approximately 5 dB larger than that of the ordinary noise barrier in a peak value. It was also confirmed that the ASE had the same effect against the moving noise source, regardless of the speed, as against the fixed source.
