SIGNAL PROCESSOR FOR A HEARING DEVICE

摘要

According to an embodiment, a hearing aid is disclosed. The hearing aid includes an implantable stimulator, and a signal processing circuit. The implantable stimulator includes two or more electrodes for emitting electric charge pulses to neural fibres of an individual. The signal processor circuit includes 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, and 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. The input circuit and the filter bank are adapted to prevent an effective level compression and an effective level expansion of the at least one noise filtered signal when the input circuit and the filter bank process the acoustic signal having a level within the individual's predefined comfortable acoustic range.