Audio processing system and method

An audio processing system for a vehicle, the audio processing system being configured to process an audio signal representing sound waves originating from at least three vehicle systems disposed on the vehicle, the audio processing system comprising a controller configured to:

• receive the audio signal from a microphone;
• process the audio signal to generate a frequency domain representation of the audio signal;
• receive operating signals indicating operating states, respectively, of the at least three vehicle systems;
• and
• decompose the frequency domain representation of the audio signal in dependence on the operating signals to identify audio profiles associated with the operation of the at least three vehicle systems, respectively,
• wherein the controller is configured to decouple the audio profiles from the audio signal;
• wherein decoupling the audio profiles comprises generating decoupled audio signals composed of the audio profiles;
• wherein the controller is configured to identify a fault condition indicator in one or more of the decoupled audio signals.