Control for hearing prosthesis fitting

1. A method for adjusting parameters of a hearing prosthesis system that includes a first stimulator, a second stimulator, and a processor, the method comprising:

adjusting a control to shift an audiogram associated with the first stimulator;

applying, by the processor, a prescription rule using the shifted audiogram to adjust a cross-over frequency between a first frequency range and a second frequency range, wherein the first stimulator is configured to apply stimulation signals in the first frequency range and the second stimulator is configured to apply stimulation signals in the second frequency range, and wherein the cross-over frequency between the first frequency range and second frequency range defines where stimulation changes from the first stimulator to the second stimulator;

disabling the second stimulator from applying stimulation signals at frequencies below the adjusted cross-over frequency; and

applying, by the processor, the prescription rule using the shifted audiogram to determine gain and maximum power output levels for the first frequency range associated with the first stimulator.

2. The method of claim 1 , wherein the first stimulator includes an acoustic stimulator and the second stimulator includes an electrical stimulator.

3. The method of claim 2 , wherein the electrical stimulator includes a cochlea electrode array.

4. The method of claim 1 , wherein the audiogram is a population average audiogram.

5. The method of claim 1 , wherein the first frequency range is lower than the second frequency range.

6. The method of claim 1 , further comprising adjusting a second control to adjust gain and MPO levels for the second frequency range associated with the second stimulator.

7. The method of claim 1 , wherein the adjusted cross-over frequency corresponds to a frequency at which the shifted audiogram crosses a threshold level.

8. A bimodal hearing prosthesis, comprising:

first stimulation electronics configured to apply first stimulation signals in a first frequency range;

second stimulation electronics configured to apply second stimulation signals in a second frequency range; and

a processor configured to

receive a shifted audiogram;

apply a prescription rule using the shifted audiogram to adjust a cross-over frequency between the first and second frequency ranges that defines where stimulation changes from using the first stimulation electronics to using the second stimulation electronics;

disable the second stimulation electronics from applying the second stimulation signals at frequencies below the adjusted cross-over frequency; and

apply the prescription rule using the shifted audiogram to calculate parameters for the first frequency range associated with the first stimulation electronics.

9. The bimodal hearing prosthesis of claim 8 , wherein the parameters include gain and maximum power output levels.

10. The bimodal hearing prosthesis of claim 8 , wherein the first stimulation electronics include an acoustic stimulator and the second stimulation electronics include an electrical stimulator.

11. The bimodal hearing prosthesis of claim 10 , wherein the electrical stimulator includes a cochlea electrode array.

12. The bimodal hearing prosthesis of claim 8 , wherein the audiogram is a population average audiogram.

13. The bimodal hearing prosthesis of claim 8 , wherein the processor is further configured to receive instructions to linearly shift the audiogram up or down, and to apply the prescription rule to the shifted audiogram.

14. The bimodal hearing prosthesis of claim 8 , wherein the first frequency range is lower than the second frequency range.

15. The bimodal hearing prosthesis of claim 8 , wherein the processor is further configured to receive instructions to adjust parameters for the second frequency range associated with the second stimulation electronics.

16. The bimodal hearing prosthesis of claim 8 , wherein the adjusted cross-over frequency corresponds to a frequency at which the shifted audiogram crosses a threshold level.