Verification of contribution separation technique for vehicle interior noise using only response signals

In this study, a contribution separation technique using only response signals were considered for an analysis of vehicle interior noise. Independent component analysis (ICA) was applied for the technique. To verify and consider the applicability of the method in contribution separation, vehicle engine, road, and wind noise sources were combined artificially to simulate vehicle interior noise and applied ICA to these signals for contribution separation. The result shows the contribution could not be obtained correctly by the permutation problem in which the correspondence relationship between calculated and actual contributions is not kept along frequency. A solution technique was then proposed to solve the problem using the characteristics of sound source. As a result, the technique with the method could calculate accurate sound source contributions using only response signals.