A hearing aid comprising an implantable stimulator comprising two or more electrodes for emitting electric charge pulses to neural fibres of an individual; a signal processor circuit comprising an input circuit adapted to receive an acoustic signal from an individual's surroundings and provide at least one corresponding input audio signal, a filter bank adapted to receive the at least one input audio signal and to output at least one band-limited audio signal in dependence on the at least one input audio signal, a noise filter adapted to attenuate undesired signal components in the at least one band-limited audio signal and to provide at least one corresponding noise-filtered signal, wherein the input circuit, filter bank and noise filter are dimensioned such that inherent nonlinearities of the input circuit, filter bank and noise filter neither affect the at least one band-limited audio signal nor the at least one corresponding noise-filtered signal when the at least one band-limited audio signal and the at least one corresponding noise-filtered signal are derived from the acoustic signal having a level within an invidual's comfortable acoustic range, and characterized in that the input circuit, filter bank, and noise filter comprise means that are adapted to compensate for nonlinearities of the input circuit, filter bank, and noise filter in order to avoid an effective level compression and an effective level expansion of the at least one noise filtered signal derived from the acoustic signal having a level within the individual's comfortable acoustic range. an implantable stimulator comprising two or more electrodes for emitting electric charge pulses to neural fibres of an individual; a signal processor circuit comprising an input circuit adapted to receive an acoustic signal from an individual's surroundings and provide at least one corresponding input audio signal, a filter bank adapted to receive the at least one input audio signal and to output at least one band-limited audio signal in dependence on the at least one input audio signal, a noise filter adapted to attenuate undesired signal components in the at least one band-limited audio signal and to provide at least one corresponding noise-filtered signal, wherein an input circuit adapted to receive an acoustic signal from an individual's surroundings and provide at least one corresponding input audio signal, a filter bank adapted to receive the at least one input audio signal and to output at least one band-limited audio signal in dependence on the at least one input audio signal, a noise filter adapted to attenuate undesired signal components in the at least one band-limited audio signal and to provide at least one corresponding noise-filtered signal, wherein the input circuit, filter bank and noise filter are dimensioned such that inherent nonlinearities of the input circuit, filter bank and noise filter neither affect the at least one band-limited audio signal nor the at least one corresponding noise-filtered signal when the at least one band-limited audio signal and the at least one corresponding noise-filtered signal are derived from the acoustic signal having a level within an invidual's comfortable acoustic range, and characterized in that the input circuit, filter bank, and noise filter comprise means that are adapted to compensate for nonlinearities of the input circuit, filter bank, and noise filter in order to avoid an effective level compression and an effective level expansion of the at least one noise filtered signal derived from the acoustic signal having a level within the individual's comfortable acoustic range.