Hearing aid fitting system

• US 6,574,342 B1
• Filed: 02/08/2000
• Issued: 06/03/2003
• Est. Priority Date: 03/17/1998
• Status: Expired due to Fees

• Current Assignee: Sonic Innovations Incorporated (William Demant Fonden)
• Original Assignee: Sonic Innovations Incorporated (William Demant Fonden)
• Inventors: Rose, Darrell, Chabries, Douglas M., Fang, Xiaoling, Davis, Keith L.
• Primary Examiner(s): LE, HUYEN D
• Application Number:
  US09/500,392
• Time in Patent Office: 1,211 Days
• Field of Search: 381/312, 381/314, 381/320, 381/321, 381/323, 381/FOR.127, 381/FOR.129, 381/FOR.131, 381/60, 128/246, 735/85, 600/559
• US Class Current: 381/314
• CPC Class Codes: H04R 25/505 using digital signal processing
• CPC Class Codes: H04R 25/70 Adaptation of deaf aid to hearing loss, e.g. initial electronic fitting

Abstract

A method for fitting a hearing compensation device comprises selecting a plurality of loudness levels for a plurality of frequencies and comparing each loudness level for each frequency for perceived sameness. The loudness levels may then be adjusted as needed to achieve perceived sameness across the frequency spectrum. A gain curve for each frequency is calculated from the selected plurality of loudness levels.

Claims

1. A hearing aid fitting system comprising:

a stimulus generating device for generating a set of audio stimuli comprising a plurality of loudness levels for each of a plurality of selected frequencies, wherein said stimilus generating device is worn by an individual being fitted and a perceived response of the individual to each said audio stimulus can be determined;

an automatic gain control device for determining a plurality of gain compensation factors for said plurality of loudness levels at said plurality of selected frequencies and for adjusting said plurality of gain compensation factors each corresponding to one of said selected frequencies or to one of said audio stimuli to achieve a substantially similar perceived loudness across the entire frequency spectrum;

a loudness interface having a graphical user interface wherein a gain compensation curve to indicate the measure of gain compensation required by the individual can be plotted and

an interconnection between said loudness interface, said automatic gain control device and said stimulus generating device.

2. The system according to claim 1, wherein said graphical user interface is capable of being manipulated for a plurality of frequency bands to measure the hearing loss of the individual.

3. The system according to claim 2, wherein the manipulation of the graphical user interface produces audio stimuli of varying frequencies and intensities.

4. The system according to claim 1, wherein the generation of said audio stimuli enables assessment of a plurality of dynamic levels in each frequency band and the comparison of said dynamic levels across a spectrum of frequency bands.

5. An apparatus for fitting a hearing aid device to an individual apparatus comprising:

means for providing a set of stimuli comprising a plurality of loudness levels for each of a plurality of selected frequencies;

means for determining a perceived response of the individual to each said stimulus;

means for determining a plurality of gain compensation factors for said plurality of loudness levels at said plurality of frequencies;

means for adjusting said plurality of gain compensation factors each corresponding of said frequencies or one of said stimuli to achieve a substantially similar perceived loudness across the entire frequency spectrum; and

means for plotting a gain compensation curve to indicate the measure of gain compensation required by the individual.

6. The apparatus according to claim 5, wherein each of the said plurality of loudness levels is represented as a loudness curve on a perceived loudness interface.

7. The apparatus according to claim 6, wherein the center frequency in each frequency band for each of the loudness levels is indicated by a marker.

8. The apparatus according to claim 7, wherein a computer pointing device can be used to select any of the markers.

9. The apparatus according to claim 8, wherein the selection of any of the markers generate a stimulus having a frequency and loudness level corresponding to the selected marker.

10. The apparatus according to claim 9, wherein said stimulus is generated by the hearing aid upon receiving a command via a serial interface.

11. The apparatus according to claim 9, wherein the frequency of the stimulus corresponds to the X axis position of the selected marker and the loudness of the stimulus corresponds to the Y axis position of the selected marker.

12. The apparatus according to claim 9, wherein the loudness of the stimulus corresponding to one of the markers can be adjusted to make the perceived sound either louder or softer.

13. The apparatus according to claim 9, wherein each marker on a selected loudness curve is perceived as having the same loudness level as each of the other markers on the selected loudness curve.

14. The apparatus according to claim 9, wherein the perception of loudness by the individual at multiple levels is measured and compared with perceived loudness across frequency bands for different dynamic levels.

15. The apparatus according to claim 9, wherein each of said loudness curves can also be selected to be fixed in place by freeze controls.

16. The apparatus according to claim 6, wherein a hearing compensation curve can be formed for each of the frequency bands from data obtained from said loudness curves.

17. The apparatus according to claim 5, wherein said loudness levels range from very soft to uncomfortably loud across the entire hearing frequency spectrum.

18. The apparatus according to claim 5, wherein the hearing loss of the individual is assessed by the tones generated by the fearing aid to be worn by the individual.

19. The apparatus according to claim 5, wherein said gain compensation curve has a plurality of regions each of said regions denoting a hearing aid gain function.

20. An apparatus for fitting a hearing aid device to an individual, the apparatus comprising:

means for providing a set of stimuli comprising a plurality of loudness levels for each of a plurality of selected frequencies;

means for determining a perceived response of the individual to each stimulus;

means for determining a plurality of gain compensation factors for said plurality of loudness levels at said plurality of frequencies, wherein the center frequency band for each of the loudness levels is indicated by a marker and a computer pointing device can be used to select any of the makers and wherein selection of any of the makers by the individual generates a stimulus having a frequency and loudness level corresponding to the selected maker;

means for adjusting said plurality of gain compensation factors each corresponding to one of said frequencies or one of said stimuli to achieve a same perceived loudness across the entire frequency spectrum; and

means for plotting a gain compensation curve to indicate the measure of gain compensation required by the individual wherein the stimulus associated with each makers is to be positioned by the individual on each of the loudness curves.