The acoustical effects of hedges result from a combination of physical noise reduction and
their influences on perception. This study investigates the physical noise reduction so as to
enable estimation of its relative importance. Different in-situ methods have been used to
measure noise shielding by hedges. These include a statistical pass-by experiment where
the real insertion loss of a hedge could be measured, three controlled pass-by experiments
using a reference microphone at close distance, and transmission loss measurements using …