Personalization of algorithm parameters of a hearing device

1. A method of personalizing one or more parameters of a processing algorithm for use in a processor of a hearing aid for a specific user, the method comprising

performing a predictive test for estimating a hearing ability of the user when listening to test signals having different characteristics;

analyzing results of said predictive test for said user and providing a hearing ability measure for said user;

selecting a specific processing algorithm comprising a directionality algorithm of said hearing aid;

selecting a cost-benefit function for said specific processing algorithm related to said user's hearing ability in dependence of said characteristics of said test signals, wherein said cost-benefit function provides a tradeoff between the benefits of directionality and the costs of directionality, wherein said directionality algorithm tends to provide a benefit to said specific user when a target signal is at a location that is relatively enhanced by beamforming and to incur costs to said specific user when attending to locations that are strongly attenuated by beamforming; and

determining, for said user, one or more personalized parameters of said specific processing algorithm in dependence of said hearing ability measure and said cost-benefit function.

2. A method according to claim 1 wherein said hearing ability measure comprises a speech intelligibility measure or a frequency discrimination measure or an amplitude discrimination measure, or a frequency selectivity measure or a temporal selectivity measure.

3. A method according to claim 1 wherein said different characteristics of the test signals are represented by one or more of

different signal-to-noise ratios (SNR),

different modulation depths or modulation indices, or

different detection thresholds of tones in broadband, bandlimited or band-stop noise, describing frequency selectivity,

different detection thresholds for temporal gaps in broadband or bandlimited noise, describing temporal selectivity,

different depths or indices of amplitude modulation as a function of modulation frequency,

different frequency or depth of spectral modulation,

sensitivity to frequency modulation at varying center frequencies and bandwidths, and

direction of frequency modulation including discrimination of positive from negative phase of Schroeder-phase stimuli.

4. A method according to claim 1 comprising selecting the predictive test for estimating a degree of hearing ability of the user.

5. A method according to claim 1 wherein said predictive test is selected from the group comprising Spectro-temporal modulation test, Triple Digit Test, Gap detection, Notched noise test, TEN test, and Cochlear compression.

6. A method according to claim 1 wherein said processing algorithm further comprises one or more of a noise reduction algorithm, a feedback control algorithm, a speaker separation and a speech enhancement algorithm.

7. A method according to claim 1 forming part of a fitting session wherein the hearing aid is adapted to the needs of the user.

8. A method according to claim 1 wherein the step of performing the predictive test comprises

initiating a test mode of an auxiliary device; and

executing said predictive test via said auxiliary device.

9. A method according to claim 8 wherein said step of performing the predictive test is initiated by said user.

10. A method according to claim 1 , wherein the cost-benefit function is configured to quantify the user's costs and benefits of helping systems.

11. A method according to claim 1 , wherein the cost-benefit function relates to the benefit of speech intelligibility, sound quality and listening effort.

12. A method according to claim 1 , wherein the cost-benefit function is estimated as the improvement due to directionality for targets from the front minus the decrement due to directionality for off-axis targets.

13. A method according to claim 1 , further comprising providing an assessment of where the user's cost-benefit function crosses over from net benefit to net cost.

14. A method according to claim 1 , further comprising providing an assessment of at which signal-to-noise ratio the user's cost-benefit function crosses over from net benefit to net cost.

15. A method according to claim 1 , wherein said cost-benefit function is expressed as a function of signal to noise ratio (SNR) for a direction algorithm (MVDR) exhibiting off-axis costs and on-axis benefits.

16. A method according to claim 15 , wherein said cost-benefit function is estimated as the improvement due to directionality for targets from the front minus the decrement due to directionality for off-axes targets.

17. A method according to claim 1 , wherein said cost-benefit function relates to aspects of hearing aid outcome including one or more of speech intelligibility, sound quality, and listening effort.

18. A hearing aid configured to be worn at or in an ear of a user and/or for being at least partially implanted in the head of a user, the hearing aid comprising:

a forward path for processing an electric input signal representing sound provided by an input unit, and for presenting a processed signal perceivable as sound to the user via an output unit,

the forward path comprising a processor for performing said processing by executing one or more configurable processing algorithms,

wherein parameters of said one or more configurable processing algorithms are personalized to the specific needs of the user by

performing a predictive test for estimating a hearing ability of the user when listening to test signals having different characteristics;

analyzing results of said predictive test for said user and providing a hearing ability measure for said user;

selecting a specific processing algorithm comprising a directionality algorithm of said hearing aid;

selecting a cost-benefit function for said specific processing algorithm related to said user's hearing ability in dependence of said characteristics of said test signals, wherein said cost-benefit function provides a tradeoff between the benefits of directionality and the costs of directionality, wherein said directionality algorithm tends to provide a benefit to said specific user when a target signal is at a location that is relatively enhanced by beamforming and to incur costs to said specific user when attending to locations that are strongly attenuated by beamforming; and

determining, for said user, one or more personalized parameters of said specific processing algorithm in dependence of said hearing ability measure and said cost-benefit function.

19. A hearing aid according to claim 18 being constituted by or comprising an air-conduction type hearing aid, a bone-conduction type hearing aid, a cochlear implant type hearing aid, or a combination thereof.

20. A hearing system comprising:

a hearing aid according to claim 10 ; and

an auxiliary device, the hearing system being adapted to establish a communication link between the hearing aid and the auxiliary device to provide that data can be exchanged or forwarded from one to the other,

wherein the auxiliary device is configured to execute an application implementing a user interface for the hearing aid and allowing a predictive test for estimating a hearing ability of a user to be initiated by the user and executed by the auxiliary device including

a) playing sound elements of said predictive test via a loudspeaker of the auxiliary device, or

b) transmitting sound elements of said predictive test via said communication link to said hearing device for being presented to the user via an output unit of the hearing aid, and

wherein the user interface is configured to receive responses of the user to the predictive test, and wherein the auxiliary device is configured to store said responses of the user to the predictive test.

21. A hearing system according to claim 20 wherein the auxiliary device comprises a remote control, a smartphone, or other portable or wearable electronic device.

22. A hearing system according to claim 20 wherein the auxiliary device comprises or forms part of a fitting system for adapting the hearing aid to a particular user's needs.

23. A hearing system according to claim 20 wherein the auxiliary device is configured to estimate a speech reception threshold of the user from the responses of the user to the predictive test.

24. A hearing system according to claim 20 wherein the auxiliary device is configured to execute the predictive test as a triple digit test where sound elements of said predictive test comprise digits a) played at different signal to noise ratios, or b) digits played at a fixed signal to noise ratio, but with different hearing aid parameters.

25. A non-transitory application, termed an APP, comprising executable instructions configured to be executed on an auxiliary device to implement a user interface for a hearing system comprising a hearing aid, wherein the APP is configured to allow a user to perform the following steps

select and initiate a predictive test for estimating a hearing ability of the user when listening to test signals having different characteristics;

initiate an analysis of results of said predictive test for said user and providing a hearing ability measure for said user;

select a specific processing algorithm comprising a directionality algorithm of said hearing aid,

select a cost-benefit function for said algorithm related to said user's hearing ability in dependence of said different characteristics of said test signals, wherein said cost-benefit function provides a tradeoff between the benefits of directionality and the costs of directionality, wherein said directionality algorithm tends to provide a benefit to said specific user when a target signal is at a location that is relatively enhanced by beamforming and to incur costs to said specific user when attending to locations that are strongly attenuated by beamforming; and

determine, for said user, one or more personalized parameters of said processing algorithm in dependence of said hearing ability measure and said cost-benefit function.

26. A non-transitory application according to claim 25 , configured to allow the user to apply said personalized parameters to said processing algorithm.

27. A non-transitory application according to claim 26 , configured to allow the user to

check the result of said personalized parameters when applied to an input sound signal provided by an input unit of the hearing aid and when the resulting signal is played for the user via an output unit of the hearing aid; and

accept or reject the personalized parameters.