Adaptations of Cnossos from octave bands to 1/3 octave bands

Abstract

CNOSSOS-EU is a new European calculation method for noise levels from road traffic, railway traffic and industry sources. The objective behind the EU directive that describes the method is to ensure that a uniform method is used throughout Europe to calculate noise levels for area planning and action plans for protecting the populations health from excessive noise levels. For computation of indoor noise levels according to current restrictions in Norway, the outdoor noise levels must be computed in 1/3 octave bands, which is not supported by CNOSSOS-EU in its current state. This report describes how 1/3 octave resolution can be introduced in CNOSSOS-EU to meet Norwegian requirements.