Project: Realisation, dissemination and application of the unit watt in airborne sound

Sound power is the total amount of sound radiated from a source such as a speaker and is often used to describe the acoustic output of technical products. This definition makes it independent of the environment and of the distance from a source but, in reality, sound power can only be determined from other measurements such as sound pressure at a certain position. This often results in different procedures to determine the sound power of a particular source producing different results, which leads to uncertainties up to the level of several decibels. This makes it impossible to compare the defined legal requirements for noise protection with measurement results in the field. This project will establish traceable measurements of sound power and develop a primary standard to realise the unit watt in airborne sound, with a target uncertainty of 0.5 decibels. It will also develop primary sound power sources, from which the unit watt can be disseminated to users.

Acronym SIB56 SoundPwr (Reference Number: SIB56)
Duration 01/06/2013 - 31/05/2016
Project Topic Metrology
Project Results
(after finalisation)
See Website
Website visit project website
Network EMRP
Call EMRP Call 2012 - Industry, SI Broader Scope and Open Excellence

Project partner

Number Name Role Country
1 Physikalisch-Technische Bundesanstalt Coordinator Germany
2 Istituto Nazionale di Ricerca Metrologica Partner Italy
3 Laboratoire national de métrologie et d'essais Partner France
4 SP Sveriges Tekniska Forskningsinstitut AB Partner Sweden
5 Turkiye Bilimsel ve Teknolojik Arastirma Kurumu Partner Turkey
6 Politecnico di Torino Italy