This part of ISO 11819 specifies a modified version of the statistical pass-by (SPB) method given inISO 11819-1 that uses a microphone mounted on a backing board instead of a microphone in normal,free-field conditions. It is applicable to measurements tak
DS/ISO/PAS 11819-4:2013 history
2013DS/ISO/PAS 11819-4:2013 Acoustics - Method for measuring the influence of road surfaces on traffic noise - Part 4: SPB method using backing board