Abstract
The assessment of noise levels, in the proximity of a building or on its facade, is a requirement of the European Environmental Noise Directive 2002/49/EC concerning environmental noise produced by road and railway traffic, airports, and industries. One of the problems that concerns both theoretical models and measurements is to estimate the correction due to reflections. Several works in the past have approached this problem, now stated by international standards, which suggest using a +3 or +6-dB correction in function of the microphone position. A complete set of measurements have been performed in the framework of the IMAGINE project for road traffic, in different urban situations, in order to determine the real intereference pattern in terms of coherence length. A careful treatment of the acquired data highlighted a dependence of corrective factors on the distance from the building facade that cannot be neglected. Practical solutions and uncertainties also will be discussed in this work.
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