1. A method for processing an audio signal based on a processing function, the method comprising:determining, at a processor, at least one parameter of the processing function based on an optimization of perceptually relevant information for the audio signal;
parameterizing the processing function with the at least one parameter; and
processing the audio signal by applying the processing function,
wherein calculation of the perceptually relevant information for the audio signal is based on an individual hearing profile for a given listener, the individual hearing profile comprising masking thresholds and hearing thresholds for the given listener.