Systems and methods for processing audio data

Described herein are systems and methods for processing audio data. For example, one embodiment provides a device configured to receive an audio signal, and process that audio signal based on a frequency mapping protocol, thereby to provide a modified audio signal. The resulting modified signal is audibly communicated to a user. In overview, the frequency mapping protocol allows components of an audio signal that within specified frequency ranges to be mapped to other frequency ranges, attenuated, or in some cases blocked altogether. The user is also able, at least in some embodiments, to use the same device to perform testing of their hearing. In some embodiments the frequency mapping protocol is modifiable by a user, for example by way of a software application running on a PC or other computational platform. This allows a significant degree of flexibility in terms of the device's operation; a user is effectively able to customize the device for his/her specific hearing requirements. For example, in the case of a partially deaf person, frequencies that could not otherwise be heard are mapped to frequencies that can be heard. In the case of a person working in a noisy environment, frequencies that are too loud (for example frequencies from particular machinery) can be terminated or attenuated.