Abstract: An audio processing system is configured to process an audio signal representing sound waves originating from at least one vehicle system disposed on a vehicle. The audio processing system includes a controller configured to receive the audio signal from a microphone. The controller processes the audio signal to generate a frequency domain representation of the audio signal. The controller also receives a first operating signal indicating an operating state of a first said vehicle system. The controller decomposes the frequency domain representation of the audio signal in dependence on the first operating signal to identify a first audio profile associated with the operation of the first vehicle system. Aspects of the present invention also relate to a vehicle including an audio processing system.