Binaural loudness cue preservation in bimodal hearing systems

One or more non-transitory computer readable storage media comprising instructions that, when executed by at least one processor, are operable to:

• calculate a target loudness ratio of acoustic stimulation signals relative to electrical stimulation signals based on a loudness of input signals received at each of a first hearing device and a second hearing device of a bimodal hearing system;
• calculate an instantaneous loudness ratio of acoustic stimulation signals relative to electrical stimulation signals based on a loudness of output signals generated at each of the first hearing device and the second hearing device;
• and
• match the instantaneous loudness ratio to the target loudness ratio by adjusting a gain used to generate output signals at either the first hearing device or the second hearing device.

A first hearing prosthesis configured to operate with a second hearing prosthesis in a bimodal hearing system, the first hearing prosthesis comprising:

• one or more sound input devices configured to receive a first set of sound signals;
• and
• one or more processors configured to:
• convert the first set of sound signals into stimulation signals for delivery to a first ear of a recipient,
• calculate a target loudness ratio based on a loudness of the first set of sound signals and a loudness of a second set of sound signals received at the second hearing prosthesis,
• calculate an inter-aural loudness ratio based on a loudness of the stimulation signals for delivery to a first ear of the recipient and a loudness of stimulation signals generated by the second hearing prosthesis for delivery to a second ear of the recipient, and
• substantially match the inter-aural loudness ratio to the target loudness ratio by adjusting a gain setting for use in generating subsequent stimulation signals for delivery to the first ear of the recipient.