A method of determining individual noise sound contributions of a plurality of physical noise sources of a motorized vehicle at a target location, comprising steps of: a) placing a plurality of reference microphones (109 - 117) at respective reference positions adjacent to respective ones of the physical noise sources, b) placing a measurement microphone at the target location, c) actuating the motorized vehicle to obtain a predetermined operating condition, d) receiving and recording a plurality of noise sound signals (x 1, x 2, x 3, x N) generated by the plurality of reference microphones (109 - 117), e) receiving and recording a target noise signal (p 1) generated by the measurement microphone at the target location, f) adaptively separating the plurality of noise sound signals (x 1, x 2, x 3, x N) using blind source separation to produce a plurality of mutually independent noise sound signals (y 1, y 2, y 3, y N) representing respective estimated noise sound signals of the plurality of physical noise sources, g) correlating each of the mutually independent noise sound signals (y 1, y 2, y 3, y N) with the recorded target noise signal to determine time domain or frequency domain characteristics of a plurality of linear transfer path filters (Z 1 (f), Z 2 (f), Z 3 (f), Z N (f)) representing respective transfer functions between the plurality of independent noise sound signals (y 1, y 2, y 3, y N) and the measurement microphone at the target location, h) applying at least one of the independent noise sound signals (y 1, y 2, y 3, y N), representing one of the physical noise sources, to the corresponding linear transfer path filter to generate at least one target noise signal component representing the individual noise sound contribution of the physical noise source at the target location. a) placing a plurality of reference microphones (109 - 117) at respective reference positions adjacent to respective ones of the physical noise sources, b) placing a measurement microphone at the target location, c) actuating the motorized vehicle to obtain a predetermined operating condition, d) receiving and recording a plurality of noise sound signals (x 1, x 2, x 3, x N) generated by the plurality of reference microphones (109 - 117), e) receiving and recording a target noise signal (p 1) generated by the measurement microphone at the target location, f) adaptively separating the plurality of noise sound signals (x 1, x 2, x 3, x N) using blind source separation to produce a plurality of mutually independent noise sound signals (y 1, y 2, y 3, y N) representing respective estimated noise sound signals of the plurality of physical noise sources, g) correlating each of the mutually independent noise sound signals (y 1, y 2, y 3, y N) with the recorded target noise signal to determine time domain or frequency domain characteristics of a plurality of linear transfer path filters (Z 1 (f), Z 2 (f), Z 3 (f), Z N (f)) representing respective transfer functions between the plurality of independent noise sound signals (y 1, y 2, y 3, y N) and the measurement microphone at the target location, h) applying at least one of the independent noise sound signals (y 1, y 2, y 3, y N), representing one of the physical noise sources, to the corresponding linear transfer path filter to generate at least one target noise signal component representing the individual noise sound contribution of the physical noise source at the target location.