Attenuating an in-SITU resonance

Abstract

Presented herein are techniques related to setting a filter for an implanted medical device and using the filter to improve operation of the implanted medical device to evoke a hearing percept. A first output signal is generated and delivered to the recipient. A feedback resulting from delivery of the first output signal to the recipient is captured. A resonance associated with the feedback is identified, and a filter is set to attenuate the resonance. A second output signal is then generated based on an input signal, which is filtered via the filter to attenuate portions of potential feedback in the input signal. Thus, limited amounts of feedback are processed to generate the second output signal, and delivering the second output signal to the recipient evokes a hearing percept more desirably.

Description

Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1ATTENUATING AN IN-SITU RESONANCEBACKGROUNDTechnical Field[ooot] The present disclosure relates generally to shaping output signals delivered to a recipient of a hearing device or medical device in order to attenuate an in-situ resonance.Related Art

[0002] Medical devices have provided a wide range of therapeutic benefits to recipients over recent decades. Medical devices can include internal or implantable components / devices, external or wearable components / devices, or combinations thereof (e.g., a device having an external component communicating with an implantable component). Medical devices, such as traditional hearing aids, partially or fully-implantable hearing prostheses (e.g., bone conduction devices, mechanical stimulators, cochlear implants, etc.), pacemakers, defibrillators, functional electrical stimulation devices, and other medical devices have been successful in performing lifesaving and / or lifestyle enhancement functions and / or recipient monitoring for a number of years.

[0003] The types of medical devices and the ranges of functions performed thereby have increased over the years. For example, many medical devices, sometimes referred to as “implantable medical devices,” now often include one or more instruments, apparatus, sensors, processors, controllers or other functional mechanical or electrical components that are permanently or temporarily implanted in a recipient. These functional devices are typically used to diagnose, prevent, monitor, treat, or manage a disease / injury or symptom thereof, or to investigate, replace or modify the anatomy or a physiological process. Many of these functional devices utilize power and / or data received from external devices that are part of, or operate in conjunction with, implantable components.SUMMARY

[0004] In one aspect, a method is provided. The method comprises: generating a first output signal with a transducer positioned at a head of a recipient; delivering the first output signal to the head of the recipient to evoke a hearing percept; capturing, via a microphone in proximity to the head of the recipient, a feedback resulting from delivery of the first output signal to the head of the recipient; and using the feedback to set a filter for shaping a second output signal generated by the transducer.Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1

[0005] In another aspect, a system is provided. The system comprises: an actuator configured to generate an output signal and deliver the output signal to a recipient; a microphone configured to capture a feedback resulting from delivery of the output signal to the recipient; one or more processors configured to identify an in-situ resonance associated with the recipient and the transducer; and a filter selected to attenuate the in-situ resonance.

[0006] In yet another aspect, a method is provided. The method comprises: capturing, via a microphone, a feedback resultant from delivery of a first output signal to a recipient; setting a filter based on the feedback; generating, via an implanted medical device, a second output signal using the filter; and delivering, via the implanted medical device, the second output signal to the recipient to evoke a hearing percept.BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Embodiments of the present disclosure are described herein in conjunction with the accompanying drawings, in which:

[0008] FIG. 1A and IB are each a perspective view of an exemplary bone conduction device in which at least some embodiments presented herein can be implemented;

[0009] FIG. 2 is a functional block diagram of an embodiment of a bone conduction device in which at least some embodiments presented herein can be implemented;[ooto] FIGs. 3 and 4 are each a side cross-sectional view illustrating a bone conduction device with which certain embodiments presented herein can be implemented;[ooit] FIG. 5 is a graph depicting possible behavior of a bone conduction device in which at least some embodiments presented herein can be implemented;

[0012] FIGs. 6, 7, and 8 are schematic diagrams illustrating operation of a bone conduction device in which at least some embodiments presented herein can be implemented;

[0013] FIGs. 9 and 10 are each a flowchart of a method for performing techniques discussed herein; and

[0014] FIG. 11 is a schematic diagram illustrating a computing device / system configured to implement certain embodiments presented herein.Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1DETAILED DESCRIPTION

[0015] Presented herein are techniques for shaping output signals delivered to a recipient of a hearing device or medical device (sometimes collectively and generally referred to herein as a “recipient device”) in order to attenuate an “in-situ resonance” associated with “in-situ operation” of the recipient device. As used herein, “in-situ operation” refers to operation of the recipient device while being worn by, or while implanted in, a recipient and the “in-situ resonance” refers to a behavior of the system during in-situ operation.

[0016] In accordance with certain embodiments presented herein, a recipient device (e.g., a hearing device, such as a bone conduction device) delivers an initial output signal to the recipient to evoke a percept (e.g., hearing perception / sensation). A microphone in proximity to the recipient captures feedback resulting from delivery of the first output signal to the recipient. The captured feedback is used to set a filter (e.g., notch filter) for shaping a second output signal delivered to the recipient so as attenuate the in-situ resonance associated with the recipient device.

[0017] There are a number of different types of recipient devices in / with which embodiments of the present disclosure can be implemented. However, merely for ease of description, the techniques presented herein are primarily described with reference to a specific device in the form of a bone conduction device / system. It is to be appreciated that the techniques presented herein can also be partially or fully implemented by any of a number of different types of devices, including other types of hearing devices and / or other types of medical devices. As used herein, the term “hearing device” is to be broadly construed as any device that acts on an acoustical perception of an individual, including to improve perception of sound signals, to reduce perception of sound signals, etc. In particular, a hearing device can deliver sound signals to a user in any form, including in the form of acoustical stimulation, mechanical stimulation, electrical stimulation, etc., and / or can operate to suppress all or some sound signals. As such, a hearing device can be a device for use by a hearing-impaired person (e.g., hearing aids, middle ear auditory prostheses, bone conduction devices, direct acoustic stimulators, electro-acoustic hearing prostheses, auditory brainstem stimulators, bimodal hearing prostheses, bilateral hearing prostheses, dedicated tinnitus therapy devices, tinnitus therapy device systems, combinations or variations thereof, etc.), a device for use by a person with normal hearing (e.g., consumer devices that provide audio streaming, consumer headphones, earphones, and other listening devices), a hearing protection device, etc. In other examples, the techniques presented herein can be implemented by, or used in conjunction with, various other medical devices.Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1

[0018] As noted above, the term “recipient device” is sometimes used herein to collectively and generally refer to devices, such as a hearing device or a medical device, that is configured to provide a therapeutic benefit to a recipient. In general, recipient devices are configured to be worn by, or implanted in, a recipient.

[0019] FIG. 1A is a perspective view of a bone conduction device 100A in which certain embodiments presented herein can be implemented. As shown, the recipient has an outer ear 101, a middle ear 102, and an inner ear 103. Elements of the outer ear 101, the middle ear 102, and the inner ear 103 are described below, followed by a description of the bone conduction device 100A.

[0020] In a fully functional human hearing anatomy, the outer ear 101 comprises an auricle 105 and an ear canal 106. A sound wave or acoustic wave 107 is collected by the auricle 105 and channeled into and through the ear canal 106. Disposed across the distal end of the ear canal 106 is a tympanic membrane 104, which vibrates in response to the acoustic wave 107. This vibration is coupled to an oval window or fenestra ovalis 110 through three bones of the middle ear 102, collectively referred to as ossicles 111 and comprising a malleus 112, an incus 113, and stapes 114. The ossicles 111 of the middle ear 102 serve to filter and amplify the acoustic wave 107, causing the oval window 110 to vibrate. Such vibration sets up waves of fluid motion within a cochlea 139. Such fluid motion, in turn, activates hair cells (not shown) that line the inside of the cochlea 139. Activation of the hair cells causes appropriate nerve impulses to be transferred through spiral ganglion cells and an auditory nerve 116 to a brain (not shown), where the nerve impulses are perceived as sound.

[0021] FIG. 1A also illustrates the positioning of the bone conduction device 100A relative to the outer ear 101, the middle ear 102, and the inner ear 103 of a recipient of device 100. As shown, the bone conduction device 100A is positioned behind the outer ear 101 of the recipient and comprises one or more sound input elements 126 to receive sound signals. The sound input elements 126 can comprise, for example, a microphone, a telecoil, a port, a wireless interface, etc. In an exemplary embodiment, the sound input elements 126 include a microphone located, for example, on or in the bone conduction device 100A. Alternatively, the sound input elements 126 could be located on a cable extending from the bone conduction device 100A, physically separated from the bone conduction device 100A (e.g., an in-the-ear microphone in wireless communication with the bone conduction device), etc.Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1

[0022] In an exemplary embodiment, the bone conduction device 100A is an operationally removable component configured to be releasably coupled to a bone conduction implant 150. That is, the bone conduction device 100A can be attached / detached to / from the bone conduction implant by the recipient (or other user) during use of the bone conduction device 100A. Such releasable coupling is accomplished via a coupling assembly 140 that is configured to mechanically mate with the bone conduction implant 150. The bone conduction implant 150 includes a percutaneous abutment 152 (sometimes referred to as an anchor system and / or a fixation system) fixed to the recipient's skull bone 136 via a screw. The percutaneous abutment 152 extends through muscle 134, fat 128, and skin 132 so that the coupling assembly 140 can be attached thereto. Such a percutaneous abutment 152 provides an attachment location for the coupling assembly 140 that facilitates efficient transmission of mechanical force (vibration) generated by the bone conduction device 100A. Due to the use of the percutaneous abutment 152, the bone conduction device 100A is sometimes referred to as a “percutaneous bone conduction device.”

[0023] The bone conduction device 100A includes a housing 125 A in which a sound processing module, an actuator / transducer, an amplifier, a controller, a battery, communication circuitry, and / or various other electronic circuits / devices are positioned. The actuator can comprise, for example, a vibrating electromagnetic actuator, a vibrating piezoelectric actuator, or another type of actuator. In operation, the sound input elements 126 convert received sound signals (e.g., the acoustic wave 107) into electrical signals. These electrical signals are processed by the sound processing module. The sound processing module generates control signals that cause the actuator to vibrate. In other words, the actuator converts the electrical signals into mechanical motion to impart vibrations to the recipient's skull bone 136. When imparted to the skull bone 136, the vibrations cause motion of fluid within the cochlea 139, which in turn induces a hearing sensation (i.e., enables the recipient to receive the sound signals received at the sound input elements 126). As such, the bone conduction device 100A is sometimes referred to as a “vibrator unit” or “vibrator,” because it generates vibrations for delivery to the skull bone 136 of the recipient.

[0024] Although FIG. 1A illustrates a percutaneous bone conduction device 100A, it is to be appreciated that certain aspects presented herein can be utilized with other types of bone conduction devices. For example, FIG. IB is a perspective view of a bone conduction device 100B in which embodiments presented herein can be implemented, and the bone conduction device 100B is considered a “transcutaneous bone conduction device.” A transcutaneous boneAtty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1 conduction device is a bone conduction device that does not use a percutaneous abutment. Instead, the transcutaneous bone conduction device is held against the skin via a magnetic coupling (e.g., coupling between magnetic material and / or magnets being implanted in the recipient and magnetic material and / or magnets of an actuator to couple the actuator to the recipient).

[0025] More specifically, FIG. IB also illustrates the positioning of the bone conduction device 100B relative to the outer ear 101, the middle ear 102, and the inner ear 103 of a recipient of the bone conduction device 100B. As shown, the bone conduction device 100B is positioned behind the outer ear 101 of the recipient and comprises a housing 125B having sound input elements 126 positioned therein or thereon. Disposed in the housing 125B is a magnetic component, a sound processing module, an actuator (e.g., electromagnetic actuator, piezoelectric actuator, etc.), an amplifier, and / or various other electronic circuits / devices are positioned. Similar to the bone conduction device 100A of FIG. 1A, in FIG. IB, the sound input elements 126 convert received sound signals into electrical signals. These electrical signals are processed by the sound processing module. The sound processing module generates control signals which cause the actuator to vibrate. In other words, the actuator converts the electrical signals into mechanical motion to impart vibrations to the skull bone 136.

[0026] In accordance with the embodiment of FIG. IB, a fixation system 144 can be used to secure an implantable component 142 to the skull bone 136. The fixation system 144 can be a bone screw fixed to the skull bone 136 and also attached to the implantable component 142. In the arrangement of FIG. IB, the bone conduction device 100B is a passive transcutaneous bone conduction device. That is, no active components, such as the actuator, are implanted beneath the recipient's skin 132. Instead, the active actuator is located in the bone conduction device 100B (e.g., in the housing 125B), and the implantable component 142 includes a magnet 146 (e.g., a magnetic plate). The magnet 146 of the implantable component 142 vibrates in response to vibrations transmitted through the skin, mechanically and / or via a magnetic field, and such vibrations are generated by a corresponding magnet (not shown) in the bone conduction device 100B (e.g., in the housing 125B).

[0027] Collectively, FIGS. 1A and IB illustrate two arrangements of bone conduction devices in which embodiments presented herein can be implemented. However, it is to be appreciated that the embodiments shown in FIGS. 1 A and IB are merely illustrative and that the techniques presented herein can be used in other arrangements. For example, the techniques presented herein could also or alternatively be implemented with “active transcutaneous bone conductionAtty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1 devices” in which the actuator is implanted within the recipient (e.g., in the implantable component 142). In such arrangements, a sound processing module can be disposed in an external component, and electrical signals representative of the processed sound signals are transcutaneously sent to the implantable component for use in driving the actuator and, as such, generating vibration for delivery to the recipient.

[0028] In general, FIGS. 1A and IB illustrate that bone conduction devices are configured to receive and process sound signals, as well as to use those sound signals to generate vibrations for delivery to the recipient. FIGS. 1A and IB correspond to percutaneous and transcutaneous mechanisms, respectively, for delivery of the vibrations to the recipient.

[0029] FIG. 2 is a functional block diagram illustrating further details regarding how sound signals are used to generate vibrations for delivery to the recipient, in accordance with certain embodiments presented herein. More specifically, shown in FIG. 2 is a bone conduction device 200 mechanically or magnetically coupled to a bone conduction implant 246 (representing a percutaneous or transcutaneous vibration delivery mechanism). The bone conduction device 200 comprises a housing 225 and one or more sound input elements, namely microphones 226, disposed in or on the housing 225. The bone conduction device 200 can include additional sound input elements that, for ease of illustration, have been omitted from FIG. 2.

[0030] The bone conduction device 200 also comprises a sound processing module 250, an amplifier 252, an actuator / transducer 254, an environmental classifier 256 (e.g., an environmental classification module), a controller 258 (e.g., a control circuit), at least one battery 260, and an interface module 262. In operation, the microphone(s) 226 are configured to receive sound signals 207 and to convert the received sound signals 207 into electrical signals 222. If other sound input elements are present, the sound signals 207 could also or alternatively can be received by as an electrical signal.

[0031] As shown in FIG. 2, the electrical signals 222 are output by the microphone(s) 226 to a sound processing module 250. The sound processing module 250 is configured to convert the electrical signals 222 into adjusted / processed electrical signals 224 by executing logic 268 stored thereon. That is, the sound processing module 250 is configured to apply one or more processing operations (e.g., filtering, noise reduction, automatic gain control / adjustment, loudness compression, etc.) to the electrical signals 222. In certain embodiments, the sound processing module 250 can include a digital signal processor.Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1

[0032] The processed electrical signals 224 are provided to the amplifier 252. The amplifier 252 amplifies (i.e., increases the time-varying voltage or current of) the processed electrical signals 224 to generate amplified output signals 230. The amplified output signals 230 are then used to drive (activate) the actuator 254 that, in turn, generates corresponding vibrations. That is, using the amplified output signals 230, the actuator 254 generates a mechanical output force that is delivered to the skull of the recipient via the bone conduction implant 246. Delivery of this output force causes one or more of motion or vibration of the recipient's skull to transmit to the cochlea, thereby activating the hair cells in the cochlea via cochlea fluid motion and, in turn, evoking perception by the recipient of the received sound signals 207.

[0033] The at least one battery 260 provides electrical power to the various components of bone conduction device 200. For ease of illustration, the battery 260 has been shown connected only to the controller 258. However, it should be appreciated that the battery 260 can be used to supply power to any electrically powered circuits / components of the bone conduction device 200, including the sound processing module 250, the amplifier 252, the actuator 254, etc.

[0034] The interface module 262 allows the recipient or other user to interact with the bone conduction device 200. For example, the interface module 262 can allow the recipient to adjust volume, alter speech processing strategies, power on / off the bone conduction device 200, etc. Again, for ease of illustration, the interface module 262 has been shown connected only to the controller 258.

[0035] The environmental classifier 256 receives the electrical signals 222 output by the microphone(s) 226. Using these electrical signals, the environmental classifier 256 is configured to evaluate / analyze the received sound signals 207 and determine the sound class / category / environment of the sound signals 207. That is, the environmental classifier 256 is configured to use the received sound signals 207 to “classify” the ambient sound environment and / or the sound signals 207 into one or more sound categories (i.e., determine the input signal type). The sound class or environment can include, but are not limited to, “Speech” (e.g., the sound signals 207 include primarily speech signals), “Noise” (e.g., the sound signals 207 include primarily noise signals), “Speech+Noise” (e.g., both speech and noise are present in the sound signals 207 ), “Wind” (e.g., the sound signals 207 include primarily wind signals), “Music” (e.g., the sound signals 207 include primarily music signals), and “Quiet” (e.g., the sound signals 207 include low speech or noise signals). The environmental classifier 256 can estimate the signal -to-noise ratio (SNR) of the sound signals 207. In one example, the environmental classifier 256 generates sound classificationAtty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1 information / data 238. The sound classification data 238 represents the sound class of the sound signals 207 and, in certain examples, the SNR of the sound signals 207.

[0036] The controller 258 is configured to use the sound classification data 238 (e.g., indicating the sound class of the sound signals 207) and operate various components, such as the sound processing module 250, the amplifier 252, and / or the interface module 262, based on the sound classification data 238. For example, the controller 258 is configured to adjust amplification of the processed electrical signals 224 via the amplifier 252 for generating the amplified output signals 230 such that the recipient more suitably perceives the sound signals 207 as a result of motion / vibration of the recipient’s skull via the actuator 254.

[0037] In the embodiment illustrated in FIG. 2, the components (e.g., microphone 226, actuator 254, etc.) have all been shown as integrated into a single housing 225. However, it should be appreciated that in certain embodiments, one or more of the illustrated components can be housed in separate or different housings. Similarly, it should also be appreciated that in such embodiments, direct connections between the various modules and devices are not necessary and that the components can communicate, for example, via wireless connections.

[0038] FIG. 3 depicts an exemplary embodiment of a bone conduction device 300 having an implantable component 350 that can be implanted based on the techniques presented herein. The bone conduction device 300 of FIG. 3 is a passive transcutaneous bone conduction device comprising an external device 340 that includes a vibrating actuator / transducer 342. The vibrating actuator 342 is located in a housing 344 of the external device 340 and is coupled to a plate 346. The plate 346 can be in the form of a permanent magnet and / or in another form that generates and / or is reactive to a magnetic field or otherwise permits the establishment of magnetic attraction between the external device 340 and the implantable component 350 to hold the external device 340 against the skin 132 of the recipient.

[0039] In an exemplary embodiment, the vibrating actuator 342 is a device that converts electrical signals into vibration. In operation, a sound input element 326 converts sound into electrical signals. Specifically, the bone conduction device 300 provides these electrical signals to the vibrating actuator 342 or to a sound processor (not shown) that processes the electrical signals and then provides those processed signals to the vibrating actuator 342. The vibrating actuator 342 converts the electrical signals (processed or unprocessed) into vibrations. Because the vibrating actuator 342 is mechanically coupled to the plate 346, the vibrations are transferred from the vibrating actuator 342 to the plate 346. An implanted plate assembly 352Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1 is part of the implantable component 350 and is made of a ferromagnetic material that, in certain embodiments, can be in the form of a permanent magnet, which generates and / or is reactive to a magnetic field, or otherwise permits the establishment of a magnetic attraction between the external device 340 and the implantable component 350 to hold the external device 340 against the skin of the recipient. Accordingly, vibrations produced by the vibrating actuator 342 of the external device 340 are transferred from the plate 346 across the skin 132 to an implantable plate 355 of the implanted plate assembly 352. This can be accomplished as a result of mechanical conduction of the vibrations through the skin 132, resulting from the external device 340 being in direct contact with the skin 132 and / or from the magnetic field between the two plates 346, 355. These vibrations are transferred without physically penetrating the skin 132 using a solid object, such as an abutment as detailed above with respect to a percutaneous bone conduction device.

[0040] As can be seen, the implanted plate assembly 352 is substantially rigidly attached to a bone fixture 351 in this embodiment. In this regard, the implanted plate assembly 352 includes a hole 354 that is contoured to the outer contours of the bone fixture 351. This hole 354 thus forms a bone fixture interface section that is contoured to the exposed section of the bone fixture 351. In an exemplary embodiment, the sections are sized and dimensioned such that at least a slip fit, or an interference fit, exists with respect to the sections. A plate screw 356 is used to secure the implanted plate assembly 352 to the bone fixture 351. As can be seen in FIG. 3, the head of the plate screw 356 is larger than the hole 354 through the implanted plate assembly 352. Thus, the plate screw 356 positively retains the implanted plate assembly 352 to the bone fixture 351. The implantable component 350 is implanted in the recipient so that the implanted plate assembly 352 (e.g., the implantable plate 355) can transfer vibration to the skull bone 136 of the recipient via the plate screw 356 and the bone fixture 351, and the vibration is in turn is relayed to the cochlea to cause the recipient to perceive sound.

[0041] FIG. 4 depicts an exemplary embodiment of a bone conduction device 400 that includes an external device 440 and an implantable component 450 that can be implanted based on the techniques presented herein. The transcutaneous bone conduction device 400 of FIG. 4 is an active transcutaneous bone conduction device in that a vibrating actuator / transducer 452 is located in the implantable component 450. Specifically, the vibrating actuator 452 is located in a housing 454 of the implantable component 450. In an exemplary embodiment, much like the vibrating actuator 342 described above with respect to transcutaneous bone conduction device, the vibrating actuator 452 is a device that converts electrical signals into vibration.Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1

[0042] The external device 440 includes a sound input element 426 that converts sound into electrical signals. Specifically, the bone conduction device 400 provides these electrical signals to the vibrating actuator 452 or to a sound processor (not shown) that processes the electrical signals and then provides those processed signals to the implantable component 450 through the skin 132 of the recipient via a magnetic inductance link. In this regard, a transmitter coil 442 of the external device 440 transmits these signals to an implanted receiver coil 456 located in a housing 458 of the implantable component 450. Components (not shown) in the housing 458, such as, for example, a signal generator or an implanted sound processor, then generate electrical signals to be delivered to the vibrating actuator 452 via an electrical lead assembly 460. The vibrating actuator 452 converts the electrical signals into vibrations.

[0043] The vibrating actuator 452 is mechanically coupled to the housing 454, and the housing 454 is substantially rigidly attached to the bone fixture 351. In this regard, the housing 454 includes a hole 462 that is contoured to the outer contours of the bone fixture 351. A housing screw 464 is used to secure the housing 454 to the bone fixture 351. A housing screw 464 extends into the bone fixture 351. A vibration output by the vibrating actuator 452 is transferred to the skull bone 136 of the recipient via the housing 454, the housing screw 464, and the bone fixture 351, and the vibration is relayed to the cochlea to cause the recipient to perceive sound.

[0044] In general, and as noted above, operation of any of the bone conduction devices 100A, 100B, 200, 300, 400 generally includes converting received sound to an output vibration to facilitate a recipient’s perception of received sound. Thus, to operate effectively, it is desirable for each of the bone conduction devices 100A, 100B, 200, 300, 400 to readily receive sound signals for subsequent processing. However, as described further below, the output signals delivered by bone conduction devices worn by, or implanted in, a recipient can include multiple resonances that degrade the recipient’s perception of the received sound. For example a bone conduction device can have two (or more) resonances affecting the output and the performance of the system. The techniques presented herein allow a bone conduction device to attenuate the two (or more) resonances, including attenuation of at least one in-situ resonance associated with the bone conduction device.

[0045] FIG. 5 is a graph 500 depicting an example behavior of a bone conduction device during operation to deliver output vibrations to a recipient. More specifically, FIG. 5 illustrates the relationship between in-situ system behavior (in-situ system operation), in terms of vibration intensity (e.g., amplitude, level) and corresponding vibration frequencies, and resulting feedback captured by a microphone as a result of the in-situ system behavior.Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1

[0046] More specifically, shown in FIG. 5 is a first line / trace 502 that represents the “in-situ system behavior” of the bone conduction device (e.g., output vibration delivered to a recipient) and a second line / trace 504 that represents feedback resulting from the delivery of the output vibration to a recipient (e.g., the results of a feedback measurement captured in response to the in-situ system behavior represented by the first line 502). As used herein, the “in-situ system behavior” refers to the collective behavior of the bone conduction device (e.g., the output transducer) as well as the behavior of the recipient’s bone / tissue that is used to deliver the vibration to the inner ear of the recipient. That is, the system behavior represents the “in-situ” operation of the bone conduction device, accounting for the operational behavior of the bone conduction device itself as well as how the recipient’s bone / tissue behaves to conduct the vibrations to the inner ear.

[0047] As shown in FIG. 5, the first line 502 representing the in-situ system behavior includes a first resonance 506 (e.g., a low frequency resonance) and a second resonance 508 (e.g., a high frequency resonance) where the vibration intensities are elevated. In this example, the first resonance 506 occurs at a first resonant frequency 510 (e.g., a frequency between approximately 600 Hertz (Hz) and 900 Hz), sometimes referred to herein as the “first resonant frequency.” The second resonance 508 occurs at a second resonant frequency 512 (e.g., a frequency between approximately between 4000 Hz and 7000 Hz), sometimes referred to herein as the “second resonant frequency.” The elevated vibration intensities at the resonant frequencies 510 and 512 can cause increased vibrational transfer from the bone structure of the recipient to the bone conduction device, thereby potentially increasing feedback received by the bone conduction device. Thus, attenuating the output at the resonant frequencies 510 and 512 reduces processing of feedback.

[0048] In some embodiments, the first resonant frequency 510 can be more easily determined because, in certain cases, the first resonance is primarily attributable to the mechanical structure / operation of the bone conduction device. That is, the first resonant frequency 510 may not be substantially affected by or change as a result of implantation or wearing of the bone conduction device. Therefore, the first resonant frequency 510 can be determined before implantation / wearing of the bone conduction device within / by a recipient, such as within a measurement lab through experimentation. For this reason, feedback resulting from the first resonance 506 can be more easily mitigated.

[0049] By way of example, after determining the first resonant frequency 510, a filter is implemented (e.g., in an electronic component, such as part of the sound processing moduleAtty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1250, part of the microphone(s) 226, and / or between the microphone(s) 226 and the sound processing module 250) to attenuate (e.g., remove) the first resonance 506. That is, parameters of the filter are set to attenuate the first resonant frequency 510 as determined in association with the first resonance 506. Consequently, even though the first resonance 506 occurs at the first resonant frequency 510, the vibration intensity of the feedback represented by the second line 504 at the first resonant frequency 510 is not elevated (i.e., does not suddenly increase), because the filter attenuates the first resonance 506. In certain embodiments, the filter used to attenuate the first resonant frequency 510 is a notch filter that attenuates the output signal within a particular range (e.g., a range encompassing the first resonant frequency 510). Additionally or alternatively, the filter used to attenuate the first resonant frequency 510 is a high-pass filter that attenuates the output signal below a threshold frequency (e.g., at or slightly above the first resonant frequency 510).

[0050] However, as noted above, the second resonance 508 / the second resonant frequency 512 cannot be determined prior to implantation of the bone conduction device because the second resonance 508 is affected by various “in-situ” factors. That is, the second resonant frequency 512 can change based on various factors related to implantation of the bone conduction device in recipient, such as recipient bone structure density, recipient tissue thickness, skin resonance, bone conduction device (e.g., housing) arrangement, bone conduction device position, and so forth, that are associated with and can change for different implantations of the bone conduction device. Thus, even though various bone conduction devices can have similar mechanical structures (e.g., similar first resonant frequencies 510), the respective second resonance 508 / second resonant frequency 512 can change for different implementations of bone conduction devices.

[0051] The second resonance 508 is an example of what is referred to herein as “in-situ resonance” of a bone conduction device because it is affected by various in-situ factors and cannot be determined prior to the bone conduction being worn by or implanted in a recipient. For this reason, the second resonant frequency 512, sometimes referred to as in the in-situ resonant frequency, is determined in-situ (e.g., during or after implantation of the bone conduction device). However, because the bone conduction device is no longer easily accessible upon implantation, it can be difficult to determine the second resonant frequency 512 directly (e.g., by measuring electrical properties, such as voltage, current, impedance, of the bone conduction device providing the vibration). Therefore, presented herein are techniquesAtty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1 that use the feedback (feedback measurements) to indirectly determine the second resonant frequency after the bone conduction device has been implanted using feedback measurements.

[0052] More specifically, as described further below, a bone conduction device delivers an initial output signal to the recipient to evoke a percept. A microphone in proximity to the recipient captures feedback resulting from delivery of the first output signal to the recipient (e.g., a feedback measurement is performed). The captured feedback is used to set a filter (e.g., notch filter) for shaping a second output signal delivered to the recipient to attenuate the in-situ resonance.

[0053] As noted, FIG. 5 illustrates example feedback via the second line 504 (feedback measurement) corresponding to in-situ system behavior 502. As shown, the feedback includes a visible spike 514 to indicate the presence of the second resonance 508 (in-situ resonance), and the spike 514 is identifiable (e.g., as being above a threshold level at the second resonant frequency 512). In other words, the feedback is received as input sound and analyzed to identify the spike 514, and the second resonance 508 is determined to occur at where the spike 514 occurs in the feedback. That is, the feedback measurement is used as a proxy to indirectly determine the frequency of the second resonance 508 in the output signal.

[0054] In accordance with embodiments presented herein, an additional filter, sometimes referred to as in-situ resonance filter, can then be implemented using the feedback measurement. As an example, the in-situ resonance filter can comprise a notch filter that attenuates (e.g., removes) output signals in a particular range 516 (e.g., a range encompassing the second resonant frequency 512). As another example, the additional filter includes a low pass filter that attenuates the output signal above a threshold frequency (e.g., at or slightly below the second resonant frequency 512).

[0055] FIG. 6 is a schematic diagram illustrating operation of a bone conduction device 600, which includes a sound input element 626 (e.g., microphone(s)) configured to receive a sound signal 607, as well as a sound processing module 650 configured to convert an electronic signal 622 to an output signal 630 (e.g., an amplified output signal) used for generating vibrations that are provided to a recipient 670 to help the recipient 670 perceive sound.

[0056] As shown, the sound processing module 650 implements a first filter 672 and an in-situ resonance filter 674 to generate the output signal 630, where at least parameters of the in-situ resonance filter 674 are determined using one or more feedback measurements (e.g., as described above with reference to FIG. 5). In some embodiments, the first filter 672 hasAtty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1 parameters used to attenuate a first resonance (e.g., a low frequency resonance), such as a resonance caused by the mechanical structure of the bone conduction device 600, and the in- situ resonance filter 674 has parameters used to attenuate a second resonance, such as a resonance caused by implantation of the bone conduction device 600. Thus, each filter 672, 674 is dedicated to attenuate a different resonance, and the filters 672, 674 cooperatively improve the integrity of the sound signal 607 in the filtered output signal 630.

[0057] In certain examples, an initial output signal 630 is delivered to the recipient and the sound input element 626 is configured to receive feedback 676 resulting from vibration of the bone structure of the recipient 670 in response to the output signal 630. The feedback 676 is analyzed to identify at least the in-situ resonance, which is then used to configure, adjust, or otherwise set one or more parameters of the in-situ resonance filter 674 to shape subsequent output signals 630 to attenuate (e.g., remove) the in-situ resonance. Therefore, in operation, the sound processing module 650 processes the filtered electronic signal 622 to generate and shape an output signal 630 that more desirably helps the recipient 670 perceive sound, such as to improve perception of the sound signal.

[0058] FIG. 7 illustrates operation of the bone conduction device 600 without usage of the in- situ resonance filter 674. In this arrangement, the in-situ resonance (e.g., a high frequency resonance) is not attenuated in the output signal 630, and the output signal 630 therefore includes a spike 614 caused by the in-situ resonance. Such an output signal 630 can cause the recipient to undesirably perceive the in-situ resonance. In contrast, FIG. 8 illustrates operation of the bone conduction device 600 with usage of the in-situ resonance filter. In this example, the in-situ resonance filter 674 attenuates the in-situ resonance and, as a result, the output signal 630 does not include the spike 614. Thus, the recipient 670 does not perceive the in-situ resonance, and the output signal 630 therefore evokes a more desirable hearing percept.

[0059] Each of FIGs. 9 and 10 discussed below illustrates a method for performing techniques discussed herein, such as for any of the bone conduction devices 100A, 100B, 200, 300, 400, 600. It should be noted that each method can be performed differently than depicted herein. For example, for any of the methods, an additional operation can be performed, and / or any of the depicted methods can be performed differently, performed in a different order, or not performed. Moreover, the respective operations of either method can be performed in any suitable manner relative to one another, such as in parallel (e.g., concurrently) and / or sequentially.Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1

[0060] FIG. 9 is a flowchart of a method 900 for setting parameters of an in-situ resonance filter of a bone conduction device that is configured to be worn by, or implanted in, a recipient. The method 900 can be performed after the bone conduction device is being worn by the recipient or after the bone conduction device is at least partially implanted in the recipient, such as upon initiating operation of the bone conduction device to cause the recipient to perceive sound. At block 902, an output signal is generated and delivered to a recipient via the bone conduction device. The output signal causes vibration of bone structure of the recipient that subsequently induces vibration of a cochlea of the recipient to cause the recipient to perceive sound. In some embodiments, the output signal is generated based on an input sound signal captured by a microphone.

[0061] At block 904, feedback produced as a result of delivery of the output signal to the recipient is captured. For example, vibration of the bone structure caused by delivery of the output signal can propagate back to the bone conduction device. A microphone can be used to capture the feedback. In some embodiments, the microphone is positioned external to the recipient to avoid exposure of the microphone to other noises (e.g., generated within the recipient). However, in some embodiments, the microphone is implanted in the recipient, and noise canceling techniques are used to improve the integrity of the feedback received by the microphone. The microphone can be the same as that used to capture an input sound signal for generating the output signal, or the microphone can be a separate microphone (e.g., dedicated for capturing feedback).

[0062] At block 906, an in-situ resonance in the output signal delivered to the recipient is determined from the feedback. For example, an amplitude or level of the feedback suddenly increases at a particular frequency, thereby indicating a resonance at a corresponding frequency in the output signal. In some embodiments, the in-situ resonance is identified based on the level of the feedback exceeding a threshold level, and the frequency at where the level of the feedback exceeds the threshold level is associated with the resonance. As noted, the in-situ resonance is based on the wearing or implantation of the bone conduction device, such as based on properties of the recipient and / or based on a positioning of the bone conduction device within or on the recipient. Indeed, the resonance can be different for different recipients (e.g., recipients having varying body structure dimensions) and may not be easily determinable, because accessibility of the bone conduction device is reduced upon implantation. Therefore, the in-situ resonance is not able to be determined prior to implantation of the bone conduction device.Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1

[0063] At block 908, one or more parameters of an in-situ resonance filter are set to attenuate the resonance. That is, the in-situ resonance filter is configured to attenuate (e.g., remove) the output signal at the particular frequency associated with the resonance. Thus, the in-situ resonance filter is used for shaping a subsequent output signal that is generated based on a subsequent input sound signal. The in-situ resonance filter therefore helps improve operation of the bone conduction device to evoke a hearing percept.

[0064] In certain embodiments, the in-situ resonance filter is a notch filter, and the parameters of the notch filter are set such that the notch filter attenuates sound between a frequency range that encompasses the frequency associated with the resonance. Additionally or alternatively, the in-situ resonance filter includes a low-pass filter, and the parameters of the low-pass filter are set such that the low-pass filter attenuates sound above a threshold frequency (e.g., that is at or below the frequency associated with the resonance). In either case, the parameters of the filter are set to attenuate sound at the particular frequency associated with the resonance as determined for the recipient based on the feedback measurement.

[0065] Setting the parameters of the in-situ resonance filter based on a resonance, identified from a feedback measurement, can improve operation of the bone conduction device more suitably for the recipient. For example, as noted above, the in-situ system behavior (e.g., one or more resonant frequencies) of a bone conduction device can be different for different recipients based, for example, on in-situ factors. Thus, the in-situ resonance filter can be configured to attenuate a particular resonance that is applicable for one recipient and not another recipient. Setting the in-situ resonance filter based on its specific implantation can attenuate the resonance more effectively, such as without excessively attenuating other sound signals that can be desirable for perception. Thus, performing the method 900 can help customize operation of a bone conduction device to evoke a hearing percept more suitably.

[0066] FIG. 10 is a flowchart of a method 1000 for operating a bone conduction device that includes an in-situ resonance filter, as described herein. For example, the method 1000 is performed after the method 900 has been performed to set the parameters of the in-situ resonance filter. At block 1002, an input sound signal is received, such as via a microphone of the bone conduction device. At block 1004, a portion of the input sound signal is attenuated via the in-situ resonance filter. Specifically, the in-situ resonance filter is set to attenuate sound signals at a particular frequency associated with an in-situ resonance of the system.Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1

[0067] At block 1006, an output signal is generated based on the input sound signal that has been partially attenuated by the in-situ resonance filter. Therefore, the output signal is shaped by the in-situ resonance filter. At block 1008, the output signal is delivered to the recipient. Specifically, the output signal is delivered as vibrations transmitted to a bone structure of the recipient to evoke a hearing percept by the recipient. Because the in-situ resonance has been attenuated (e.g., removed), the output signal that is generated and delivered can include relatively more sound components that are desirable for perception (e.g. as compared to sound components associated with the in-situ resonance that are undesirable) by the recipient. Therefore, generating and delivering the output signal based on the input audio signal that has been partially attenuated via the filter can improve operation of the bone conduction device. For example, the bone conduction device enables the recipient to perceive desirable sound signals more clearly.

[0068] FIG. 11 illustrates an example of a suitable computing system 1100 configured to perform one or more operations in accordance with certain embodiments presented herein. Computing systems, environments, or configurations that can be suitable for use with examples described herein include, but are not limited to, personal computers, server computers, handheld devices, laptop devices, multiprocessor systems, microprocessor-based systems, programmable consumer electronics (e.g., smart phones), network PCs, minicomputers, mainframe computers, tablets, distributed computing environments that include any of the above systems or devices, and the like. The computing system 1100 can be a single virtual or physical device operating in a networked environment over communication links to one or more remote devices. The remote device can be an auditory prosthesis (e.g., an auditory prosthesis), a personal computer, a server, a router, a network personal computer, a peer device or other common network node.

[0069] In its most basic configuration, the computing system 1100 includes at least one processing unit 1102 and memory 1104. The processing unit 1102 includes one or more hardware or software processors (e.g., Central Processing Units) that can obtain and execute instructions. The processing unit 1102 can communicate with and control the performance of other components of the computing system 1100. The memory 1104 is one or more software or hardware -based computer-readable storage media operable to store information accessible by the processing unit 1102. The memory 1104 can store, among other things, instructions executable by the processing unit 1102 to implement applications or cause performance of operations described herein, as well as other data. The memory 1104 can be volatile memoryAtty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1(e.g., RAM), non-volatile memory (e.g., ROM), or combinations thereof. The memory 1104 can include transitory memory or non-transitory memory. The memory 1104 can also include one or more removable or non-removable storage devices. In examples, the memory 1104 can include RAM, ROM, EEPROM (Electronically-Erasable Programmable Read-Only Memory), flash memory, optical disc storage, magnetic storage, solid state storage, or any other memory media usable to store information for later access. In examples, the memory 1104 encompasses a modulated data signal (e.g., a signal that has one or more of its characteristics set or changed in such a manner as to encode information in the signal), such as a carrier wave or other transport mechanism and includes any information delivery media. By way of example, and not limitation, the memory 1104 can include wired media such as a wired network or direct- wired connection, and wireless media such as acoustic, RF, infrared and other wireless media or combinations thereof. In certain embodiments, the memory 1104 comprises logic 1105 that, when executed, enables the processing unit 1102 to perform aspects of the techniques presented.

[0070] In the illustrated example, the computing system 1100 further includes a network adapter 1106, one or more input devices 1108, and one or more output devices 1110. The computing system 1100 can include other components, such as a system bus, component interfaces, a graphics system, a power source (e.g., a battery), among other components. The network adapter 1106 is a component of the computing system 1100 that provides network access (e.g., access to at least one network 1120). The network adapter 1106 can provide wired or wireless network access and can support one or more of a variety of communication technologies and protocols, such as ETHERNET, cellular, BLUETOOTH, near-field communication, and RF (Radiofrequency), among others. The network adapter 1106 can include one or more antennas and associated components configured for wireless communication according to one or more wireless communication technologies and protocols.

[0071] The one or more input devices 1108 are devices over which the computing system 1100 receives input from a user. The one or more input devices 1108 can include physically- actuatable user-interface elements (e.g., buttons, switches, or dials), touch screens, keyboards, mice, pens, and voice input devices, among others input devices. The one or more output devices 1110 are devices by which the computing system 1100 is able to provide output to a user. The output devices 1110 can include displays, speakers, and printers, among other output devices for presentation of visual or audible information to the recipient, a clinician, an audiologist, or other user.Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1

[0072] It is to be appreciated that the arrangement for the computing system 1100 shown in FIG. 11 is merely illustrative and that aspects of the techniques presented herein can be implemented at a number of different types of systems / devices including any combination of hardware, software, and / or firmware configured to perform the functions described herein. For example, the computing system 1100 could be a laptop computer, a tablet computer, a mobile phone, a surgical system, and / or any other electronic device having the capabilities to perform the associated operations described elsewhere herein.

[0073] As should be appreciated, while particular uses of the technology have been illustrated and discussed above, the disclosed technology can be used with a variety of devices in accordance with many examples of the technology. The above discussion is not meant to suggest that the disclosed technology is only suitable for implementation within systems akin to that illustrated in the figures. In general, additional configurations can be used to practice the processes and systems herein and / or some aspects described can be excluded without departing from the processes and systems disclosed herein.

[0074] This disclosure described some aspects of the present technology with reference to the accompanying drawings, in which only some of the possible aspects were shown. Other aspects can, however, be embodied in many different forms and should not be construed as limited to the aspects set forth herein. Rather, these aspects were provided so that this disclosure was thorough and complete and fully conveyed the scope of the possible aspects to those skilled in the art.

[0075] As should be appreciated, the various aspects (e.g., portions, components, etc.) described with respect to the figures herein are not intended to limit the systems and processes to the particular aspects described. Accordingly, additional configurations can be used to practice the methods and systems herein and / or some aspects described can be excluded without departing from the methods and systems disclosed herein.

[0076] According to certain aspects, systems and non-transitory computer readable storage media are provided. The systems are configured with hardware configured to execute operations analogous to the methods of the present disclosure. The one or more non-transitory computer readable storage media comprise instructions that, when executed by one or more processors, cause the one or more processors to execute operations analogous to the methods of the present disclosure.Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1

[0077] Similarly, where steps of a process are disclosed, those steps are described for purposes of illustrating the present methods and systems and are not intended to limit the disclosure to a particular sequence of steps. For example, the steps can be performed in differing order, two or more steps can be performed concurrently, additional steps can be performed, and disclosed steps can be excluded without departing from the present disclosure. Further, the disclosed processes can be repeated.

[0078] Although specific aspects were described herein, the scope of the technology is not limited to those specific aspects. One skilled in the art will recognize other aspects or improvements that are within the scope of the present technology. Therefore, the specific structure, acts, or media are disclosed only as illustrative aspects. The scope of the technology is defined by the following claims and any equivalents therein.

[0079] It is also to be appreciated that the embodiments presented herein are not mutually exclusive and that the various embodiments may be combined with another in any of a number of different manners.

Claims

Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1CLAIMSWhat is claimed is:

1. A method, comprising: generating a first output signal with a transducer positioned at a head of a recipient; delivering the first output signal to the head of the recipient to evoke a hearing percept; capturing, via a microphone in proximity to the head of the recipient, a feedback resulting from delivery of the first output signal to the head of the recipient; and using the feedback to set a filter for shaping a second output signal generated by the transducer.

2. The method of claim 1, wherein using the feedback to set the filter for shaping the second output signal delivered by the transducer comprises: using the feedback to identify an in-situ resonance associated with the head of the recipient and the transducer; and setting the filter to attenuate the in-situ resonance from the second output signal delivered by the transducer.

3. The method of claim 1 or 2, wherein using the feedback to set the filter for shaping the second output signal delivered by the transducer comprises: setting one or more parameters of a notch filter for shaping the second output signal.

4. The method of claim 3, wherein the one or more parameters of the notch filter comprises a frequency range attenuated by the notch filter.

5. The method of claim 1 or 2, comprising: delivering the second output signal to the head of the recipient to evoke another hearing percept.

6. The method of claim 1 or 2, using the feedback to set the filter for shaping the second output signal comprises: receiving an input signal; attenuating a portion of the input signal via the filter to create a filtered input signal; andAtty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC1 generating the second output signal based on the filtered input signal.

7. The method of claim 1 or 2, comprising: capturing an input signal; and generating the first output signal based on the input signal.

8. The method of claim 1 or 2, wherein the first output signal comprises a mechanical output to induce a vibration of a bone structure of the recipient.

9. A system, comprising: an actuator configured to generate an output signal and deliver the output signal to a recipient; a microphone configured to capture a feedback resulting from delivery of the output signal to the recipient; one or more processors configured to identify an in-situ resonance associated with the recipient and the actuator; and a filter selected to attenuate the in-situ resonance.

10. The system of claim 9, wherein the filter comprises a notch filter.

11. The system of claim 9, wherein the microphone is positioned external to the recipient.

12. The system of claim 9, 10, or 11, wherein the actuator is configured to generate an additional output signal, and the filter is configured to shape the additional output signal to attenuate the in-situ resonance.

13. The system of claim 12, wherein the microphone is configured to capture an input signal, and the actuator is configured to generate the additional output signal based on the input signal.

14. The system of claim 13, wherein the filter is configured to attenuate a portion of the input signal to provide a filtered input signal, the one or more processors are configured to process the filtered input signal to provide a processed signal, and the actuator is configured to generate the output signal based on the processed signal.Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC115. The system of claim 9, 10, or 11, wherein the output signal generated by the actuator comprises a mechanical output to induce a vibration of a bone structure of the recipient.

16. The system of claim 9, 10, or 11, comprising: an additional fdter configured to attenuate an additional resonance associated with the actuator, wherein a first frequency associated with the in-situ resonance is greater than a second frequency associated with the additional resonance.

17. A method, comprising: capturing, via a microphone, a feedback resultant from delivery of a first output signal to a recipient; setting a filter based on the feedback; generating, via an implanted medical device, a second output signal using the filter; and delivering, via the implanted medical device, the second output signal to the recipient to evoke a hearing percept.

18. The method of claim 17, wherein setting the filter based on the feedback comprises: identifying a resonance of the feedback; and setting the filter based on the resonance.

19. The method of claim 18, wherein setting the filter based on the resonance comprises: setting the filter to attenuate sound at a frequency associated with the resonance.

20. The method of claim 17, 18, or 19, comprising: capturing, via the microphone, an input signal, wherein the second output signal is generated based on the input signal.

21. The method of claim 17, 18, or 19, wherein the second output signal is generated via the implanted medical device using the filter and an additional filter, the filter is configured to attenuate sound at a first frequency, and the additional filter is configured to attenuate sound at a second frequency.Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC122. The method of claim 21, wherein the filter is set based on the feedback to attenuate sound at the first frequency in response to the first frequency being associated with a resonance of the feedback.

23. The method of claim 22, wherein the filter is set based on the feedback to attenuate sound within a range of frequencies encompassing the first frequency.

24. One or more non-transitory computer readable storage media comprising instructions that, when executed by one or more processors, are configured to: obtain data indicating feedback resultant from delivery of a first output signal to a head of recipient via a transducer; use the feedback to set a filter for shaping a second output signal delivered to the head of the recipient via the transducer; generating a first output signal with a transducer positioned at a head of a recipient; and delivering the first output signal to the head of the recipient to evoke a hearing percept.

25. The one or more non-transitory computer readable storage media of claim 24, further comprising instructions that, when executed by the one or more processors, are configured to: use the feedback to identify an in-situ resonance associated with the head of the recipient and the transducer; and setting the filter to attenuate the in-situ resonance from the second output signal delivered by the transducer.

26. The one or more non-transitory computer readable storage media of claim 24 or 25, further comprising instructions that, when executed by the one or more processors, are configured to: set one or more parameters of a notch filter for shaping the second output signal.

27. The one or more non-transitory computer readable storage media of claim 26, wherein the one or more parameters of the notch filter comprises a frequency range attenuated by the notch filter.Atty. Docket No. 3065.0864i Client Ref. No. CID03884WOPC128. The one or more non-transitory computer readable storage media of claim 24 or 25, further comprising instructions that, when executed by the one or more processors, are configured to: receive an input signal; attenuate a portion of the input signal via the filter to create a filtered input signal; and generate the second output signal based on the filtered input signal.

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