Methods and systems for assessing insertion position of hearing instrument

1. A method for fitting a hearing instrument, the method comprising:

generating, by a speaker included in an in-ear assembly of the hearing instrument, a sound that includes a range of frequencies;

measuring, by a microphone included in the in-ear assembly of the hearing instrument, an acoustic response to the sound;

classifying, by a processing system of the hearing instrument, based on the acoustic response to the sound, a depth of insertion of the in-ear assembly of the hearing instrument into an ear canal of a user; and

generating an indication based on the depth of insertion.

2. The method of claim 1 , wherein:

the method further comprises:

determining, by the processing system, a notch frequency based on the acoustic response, wherein the notch frequency is a frequency in the range of frequencies having a level that is attenuated in the acoustic response relative to levels in the acoustic response of frequencies surrounding the frequency; and

estimating, by the processing system, based on the notch frequency, a distance metric associated with a distance from the in-ear assembly to a tympanic membrane of the user of the hearing instrument, and

classifying the depth of insertion comprises classifying, by the processing system, based on the distance metric, the level of insertion of the in-ear assembly of the hearing instrument into the ear canal of the user.

3. The method of claim 2 , wherein classifying the depth of insertion comprises: classifying, by the processing system, based on the distance metric and a range of ear canal lengths for the user, the depth of insertion.

4. The method of claim 3 , wherein classifying the depth of insertion comprises determining, by the processing system, that the depth of insertion is a first class or a second class depending on whether the distance is within a specified range, the specified range being defined by (1) an upper end of the range of ear canal lengths for the user minus a length of all or part of the in-ear assembly of the hearing instrument and (2) a lower end of the range of ear canal lengths of the user minus the length of all or part of the in-ear assembly of the hearing instrument.

5. The method of claim 2 , wherein:

the microphone is a first microphone,

the method further comprises measuring, by a second microphone of the hearing instrument, the acoustic response to the sound, and

determining the notch frequency comprises determining, by the processing system, the notch frequency based on the acoustic response as measured by the first microphone and the acoustic response as measured by the second microphone.

6. The method of claim 2 , wherein:

a shell of the in-ear assembly defines a first port and a second port,

measuring the acoustic response to the sound comprises:

obtaining, by the processing system, the acoustic response to the sound as measured by the microphone through the first port; and

obtaining, by the processing system, the acoustic response to the sound as measured by the microphone through the second port, and

determining the notch frequency comprises determining, by the processing system, the notch frequency based on the acoustic response as measured by the microphone through the first port and the acoustic response as measured by the microphone through the second port.

7. The method of claim 1 , wherein classifying the depth of insertion comprises:

determining, by the processing system, whether the depth of insertion is in a first class or a second class, the first class corresponding to under-insertion of the in-ear assembly of the hearing instrument into the ear canal of the user, and the second class corresponding to adequate insertion of the in-ear assembly of the in-ear assembly of the hearing instrument into the ear canal of the user.

8. The method of claim 1 , wherein the indication instructs the user to insert the in-ear assembly of the hearing instrument further into the ear canal of the user.

9. The method of claim 1 , further comprising determining, by the processing system, based on a history of attempts by the user to insert the in-ear assembly of the hearing instrument into the ear canal of the user, whether to initiate a process that comprises generating the sound, measuring the acoustic response, and classifying the depth of insertion.

10. The method of claim 1 , wherein classifying the depth of insertion comprises classifying, by the processing system, the depth of insertion based on whether the depth of insertion is appropriate for one or more sensors included in the in-ear assembly of the hearing instrument.

11. The method of claim 1 , further comprising determining, based on the acoustic response to the sound, whether the in-ear assembly of the hearing instrument is inserted into a left ear or right ear of the user.

12. A system comprising:

an in-ear assembly of a hearing instrument, the in-ear assembly comprising:

a speaker of a hearing instrument, the speaker configured to generate a sound that includes a range of frequencies; and

a microphone of the hearing instrument, wherein the microphone is configured to measure an acoustic response to the sound; and

one or more processors implemented in circuitry, the one or more processors configured to:

classify, based on the acoustic response to the sound, a depth of insertion of the in-ear assembly of the hearing instrument into an ear canal of a user; and

generate an indication based on the depth of insertion.

13. The system of claim 12 , wherein the one or more processors are further configured to:

determine a notch frequency based on the acoustic response, wherein the notch frequency is a frequency in the range of frequencies that has a level in the acoustic response that is attenuated relative to levels in the acoustic response of frequencies surrounding the frequency;

estimate, based on the notch frequency, a distance metric associated with a distance from the in-ear assembly to a tympanic membrane of the user of the hearing instrument, and

classify, based on the distance metric, the depth of insertion.

14. The system of claim 13 , wherein the one or more processors are configured to classify, based on the distance metric and a range of ear canal lengths for the user, the depth of insertion.

15. The system of claim 14 , wherein the one or more processors are configured such that, as part of classifying the depth of insertion, the one or more processors determine that the depth of insertion is a first class or a second class depending on whether the distance is within a specified range, the specified range being defined by (1) an upper end of the range of ear canal lengths for the user minus a length of all or part of an in-ear assembly of the hearing instrument and (2) a lower end of the range of ear canal lengths of the user minus the length of all or part of the in-ear assembly of the hearing instrument.

16. The system of claim 13 , wherein:

the microphone is a first microphone,

the hearing instrument includes a second microphone,

the one or more processors are further configured to obtain the acoustic response to the sound as measured by the second microphone of the hearing instrument, and

the one or more processors are configured to determine the notch frequency based on the acoustic response as measured by the first microphone and the acoustic response as measured by the second microphone.

17. The system of claim 13 , wherein:

a shell of the in-ear assembly defines a first port and a second port,

the one or more processors are further configured to:

obtain the acoustic response to the sound as measured by the microphone through the first port;

obtain the acoustic response to the sound as measured by the microphone through the second port, and

the one or more processors are configured to determine the notch frequency based on the acoustic response as measured by the microphone through the first port and the acoustic response as measured by the microphone through the second port.

18. The system of claim 12 , wherein the one or more processors are configured such that, as part of classifying the depth of insertion, the one or more processors:

determine whether the depth of insertion is in a first class or a second class, the first class corresponding to under-insertion of the in-ear assembly of the hearing instrument into the ear canal of the user, the second class corresponding to adequate insertion of the in-ear assembly of the hearing instrument into the ear canal of the user.

19. The system of claim 12 , wherein the indication instructs the user to insert the in-ear assembly of the hearing instrument further into the ear canal of the user.

20. The system of claim 12 , wherein the one or more processors are further configured to determine, based on a history of attempts by the user to insert the in-ear assembly of the hearing instrument into the ear canal of the user, whether to initiate a process that comprises generating the sound, measuring the acoustic response, and classifying the depth of insertion.

21. The system of claim 12 , wherein the one or more processors are configured such that, as part of classifying the depth of insertion, the one or more processors classify the depth of insertion based on whether the depth of insertion is appropriate for one or more sensors included in the in-ear assembly of the hearing instrument.

22. The system of claim 12 , wherein the one or more processors are further configured to determine, based on the acoustic response to the sound, whether the in-ear assembly of the hearing instrument is inserted into a left ear or a right ear of the user.