Systems and methods for detecting degradation of a microphone included in an auditory prosthesis system

1. A system comprising:

a sound processor associated with a patient;

a first microphone communicatively coupled to the sound processor and configured to detect an audio signal generated from a source external to the patient and output a first output signal representative of the audio signal;

a second microphone communicatively coupled to the sound processor and configured to detect the audio signal generated from a source external to the patient and output a second output signal representative of the audio signal;

wherein the sound processor is configured to

receive the first and second output signals,

determine that a difference between the first and second output signals meets a threshold condition by

determining a distance between the first and second microphones,

determining a cutoff frequency for a low-pass filter definition in accordance with c/(X*d), where c is a speed of sound in air, d is the determined distance between the first and second microphones, and X is a value greater than three,

identifying a first filtered portion from the first output signal by low-pass filtering the first output signal according to the low-pass filter definition,

identifying a second filtered portion from the second output signal by low-pass filtering the second output signal according to the low-pass filter definition, and

determining that a difference between the first and second filtered portions meets the threshold condition, and

perform, in response to the determination that the difference between the first and second output signals meets the threshold condition, a predetermined action associated with a quality level of the first microphone.

2. The system of claim 1 , wherein the sound processor is configured to determine that the difference between the first and second filtered portions meets the threshold condition by:

averaging the first filtered portion to obtain a first averaged output signal;

averaging the second filtered portion to obtain a second averaged output signal;

generating a difference signal representative of a difference between the first and second averaged output signals; and

determining that the difference signal is outside a predetermined tolerance range of a reference signal maintained by the sound processor.

3. The system of claim 1 , wherein X is equal to 4.

4. The system of claim 2 , wherein the sound processor is configured to generate the reference signal by:

receiving a first reference output signal from the first microphone prior to receiving the first and second output signals;

receiving a second reference output signal from the second microphone prior to receiving the first and second output signals;

generating a difference signal representative of a difference between the first and second reference output signals; and

designating the difference signal representative of the difference between the first and second reference output signals as the reference signal.

5. The system of claim 1 , wherein the sound processor is configured to perform the predetermined action associated with the quality level of the first microphone by adjusting one or more control parameters that govern an operation of at least one of the sound processor and a cochlear implant implanted within the patient.

6. The system of claim 1 , wherein the sound processor is configured to perform the predetermined action associated with the quality level of the first microphone by providing a notification that the quality level of the first microphone is below the acceptable level.

7. The system of claim 6 , wherein the sound processor is configured to provide the notification by activating a light-emitting device communicatively coupled to the sound processor.

8. The system of claim 6 , wherein the sound processor is configured to provide the notification by activating a speaker communicatively coupled to the sound processor.

9. The system of claim 6 , wherein the sound processor is configured to provide the notification by producing a diagnostic signal at a diagnostic interface communicatively coupled to the sound processor.

10. The system of claim 1 , further comprising:

a housing configured to be wearable by a patient and configured to house the sound processor;

wherein

the first microphone is separate from the housing, and

the second microphone is at least partially disposed within the housing.

11. A system comprising:

a housing configured to be wearable by a patient;

a sound processor disposed within the housing;

a first microphone separate from the housing and communicatively coupled to the sound processor, the first microphone being configured to detect an audio signal generated from a source external to the patient and output a first output signal representative of the audio signal;

a second microphone at least partially disposed within the housing and communicatively coupled to the sound processor, the second microphone configured to detect the audio signal generated from the source external to the patient and output a second output signal representative of the audio signal; and

an output device;

wherein the sound processor is configured to

receive the first and second output signals,

determine that a difference between the first and second output signals meets a threshold condition by

determining a distance between the first and second microphones,

determining a cutoff frequency for a low-pass filter definition in accordance with c/(X*d), where c is a speed of sound in air, d is the determined distance between the first and second microphones, and X is a value greater than three,

identifying a first filtered portion from the first output signal by low-pass filtering the first output signal according to the low-pass filter definition,

identifying a second filtered portion from the second output signal by low-pass filtering the second output signal according to the low-pass filter definition, and

determining that a difference between the first and second filtered portions meets the threshold condition, and

direct, in response to the determination that the difference between the first and second output signals meets the threshold condition, the output device to generate a perceptible output indicating a degradation of the first microphone.

12. The system of claim 11 , further comprising an ear hook assembly configured to connect to the housing, wherein the first microphone is coupled to the ear hook assembly.

13. The system of claim 11 , wherein the output device comprises one or more of a light-emitting device and a speaker.

14. The system of claim 11 , wherein the output device comprises a diagnostic interface.

15. A method comprising:

receiving, by a sound processor associated with a patient, a first output signal from a first microphone, the first output signal representative of an audio signal generated from a source external to the patient and detected by the first microphone;

receiving, by the sound processor, a second output signal from a second microphone, the second output signal representative of the audio signal generated from the source external to the patient and detected by the second microphone;

determining, by the sound processor, that a difference between the first and second output signals meets a threshold condition by

determining a distance between the first and second microphones,

determining a cutoff frequency for a low-pass filter definition in accordance with c/(X*d), where c is a speed of sound in air, d is the determined distance between the first and second microphones, and X is a value greater than three,

identifying a first filtered portion from the first output signal by low-pass filtering the first output signal according to the low-pass filter definition,

identifying a second filtered portion from the second output signal by low-pass filtering the second output signal according to the low-pass filter definition, and

determining that a difference between the first and second filtered portions meets the threshold condition; and

performing, by the sound processor in response to the determination that the difference between the first and second output signals meets the threshold condition, a predetermined action associated with a quality level of the first microphone.

16. The method of claim 15 , wherein the determining that the difference between the first and second filtered portions meets the threshold condition comprises:

averaging the first filtered portion to obtain a first averaged output signal;

averaging the second filtered portion to obtain a second averaged output signal;

generating a difference signal representative of a difference between the first and second averaged output signals; and

determining that the difference signal is outside a predetermined tolerance range of a reference signal maintained by the sound processor.

17. The method of claim 16 , further comprising generating, by the sound processor, the reference signal by:

receiving a first reference output signal from the first microphone prior to receiving the first and second output signals;

receiving a second reference output signal from the second microphone prior to receiving the first and second output signals;

generating a difference signal representative of a difference between the first and second reference output signals; and

designating the difference signal representative of the difference between the first and second reference output signals as the reference signal.

18. The method of claim 15 , wherein the performing of the predetermined action associated with the quality level of the first microphone comprises adjusting one or more control parameters that govern an operation of at least one of the sound processor and a cochlear implant implanted within the patient.

19. The method of claim 15 , wherein the performing of the predetermined action associated with the quality level of the first microphone comprises providing a notification that the quality level of the first microphone is below the acceptable level.

20. The method of claim 19 , wherein the providing of the notification comprises activating a light-emitting device communicatively coupled to the sound processor.