Patent Application
20180295455
This description relates generally to in-ear listening devices, and more specifically, to systems and methods for selecting an ear tip for a hearing aid, earphone, or similar in-ear listening device according to a user-defined balance of occlusion and gain.
In accordance with one aspect, a system for configuring a hearing device comprises an in-ear listening device; a plurality of customization components for use with the in-ear listening device, each customization component when in combination with the listening device cooperating with the listening device to define a controlled amount of venting; and a self-fitting assistance processing device in communication with the in-ear listening device, which adjusts a gain of the in-ear listening device according to the amount of venting provided by a selected one of the customization components.
Aspects may include one or more of the following features. The customization components may comprise ear tips configured for removably coupling to the in-ear listening device. The controlled amount of venting may be controlled by a passage through the ear tip. The in-ear listening device may be constructed and arranged as an earbud, and the customization component may be a component of the earbud that controls dimensions of a passage through the earbud. The self-fitting assistance processing system may automatically adjust a tuning parameter. The tuning parameter may be at least one of a dynamic range compression parameter, equalization parameter, output limit, bandwidth limit, a gain limit, feedback filter design, or feed-forward filter design. The self-fitting assistance processing system may include a user interface that displays a recommendation result regarding the selected customization component. Each of the plurality of customization components may have a unique effect on occlusion caused by the in-ear listening device, and the self-fitting assistance processing system may balance gain against the occlusion. The self-fitting assistance processing device may adjust a gain of the listening device to determine a balance between quality of a voice of a user of the in-ear listening device including the effect of the venting provided by the selected customization component and a maximum amount of stable gain supported by the venting. The in-ear listening device may include a processor that enhances a sound received by the in-ear listening device in response to an input received from the self-fitting assistance processing device. The self-fitting assistance processing device may remotely control the in-ear listening device. The in-ear listening device may include a sensing device that receives and processes signals for identifying the selected customization component.
In accordance with another aspect, a method for configuring a hearing device comprises selecting and attaching a customization component providing a controlled amount of venting to an in-ear listening device; adjusting an amount of gain applied to signals by the in-ear listening device according to the amount of venting provided by the selected customization component; and determining whether the amount of venting is acceptable based on both the gain allowed by the in-ear listening device and an amount of occlusion experienced by a user.
Aspects may include one or more of the following features. The method may further comprise automatically detecting the selected customization component, wherein adjusting the gain may comprise adjusting the gain within a gain range limit permitted by the in-ear listening device. Adjusting the gain of the in-ear listening device may comprise identifying the customization component that was selected; and adjusting the gain according to an identified amount of venting provided by the customization component. The gain may be adjusted to determine a balance between quality of a voice of a user of the in-ear listening device including the identified amount of venting and a maximum amount of stable gain supported by the identified amount of venting. The in-ear listening device may include a sensing device for automatically identifying the attached customization component. The method may further comprise performing a combination of manual and automatic sensing, including automatic sensing and monitoring of use and recommended changes after initial use.
In another aspect, a hearing device comprises an earbud including an acoustic driver; an ear tip constructed and arranged for positioning between the earbud and an ear canal of a wearer; the combination of earbud and ear tip providing a controlled amount of venting between the ear canal of the wearer and the outside environment; and a gain control device that adjusts the gain of the hearing device according to the controlled amount of venting. Aspects may include one or more of the following features. The controlled amount of venting may result in a unique amount of occlusion caused by the hearing device, and the gain control device may adjust a gain of the hearing device to determine a balance between quality of a voice of a user of the hearing device including the occlusion, and a maximum amount of stable gain supported by the controlled amount of venting. The hearing device may further comprise a sensing device for automatically identifying the combination of earbud and ear tip and the corresponding controlled amount of venting.
The above and further advantages of examples of the present concepts may be better understood by referring to the following description in conjunction with the accompanying drawings, in which like numerals indicate like structural elements and features in various figures. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of features and implementations.
A common problem with conventional in-ear listening devices concerns the occlusion effect, which occurs when low frequency sound from the vibrating walls of the ear canal, such as that produced by the wearer's own voice, is amplified due to the sound being trapped in the ear canal by the listening device blocking the ear canal. The seal that results in occlusion is helpful, however, because it prevents the creation of a positive feedback loop between the listening device output and any external microphones it uses for detecting and reproducing ambient sound. Preventing instability, i.e., this positive feedback, allows the listening device to apply a higher gain to the external sound, increasing the range of hearing loss the device can address, or the amount of augmented perception it can provide to a normal-hearing user. An occluding seal is also beneficial in providing passive attenuation of ambient sound, either for noise-reduction purposes or to improve the quality of the device's control over what the user hears. The amount of occlusion can be controlled by providing a vent through the listening device structure. Vents allow the designer more control over the amount of occlusion than configuring the sealing structure to seal less than perfectly.
Hearing-impaired users can often tolerate some occlusion because they are less sensitive to the occlusion-amplified sound. These users may desire an increased gain, and may therefore select a listening device with greater occlusion to preserve stability while applying high gain. Such users may therefore desire a high gain, e.g., greater than 30 dB, and require a smaller vent, also referred to as a port, and more specifically, a smaller vent size, to reduce acoustic feedback caused by leakage from the device's transducer. The effect of vent size on the maximum possible gain is illustrated in the graph of
However, it is difficult to predict exactly who will suffer from the occlusion effect for a particular vent diameter. Other users, e.g., non-hearing-impaired users or those with less hearing loss, are more sensitive to the occlusion effect, and may therefore require a larger vent size. For these users, the larger vent size may increase the risk of acoustic feedback, decreasing the gain that can be applied without instability. Significant venting provides more natural, low-frequency response, and can remove the effects of occlusion by allowing low frequency energy to escape from the ear canal, but it opens up a path of ambient noise penetration.
Since a combination of occlusion and amplification is relevant to a wearer's satisfaction of the listening device, it is desirable to a wearer to subjectively select a listening device that includes a vent size that strikes a balance between the occlusion effect and amplification. In view of the foregoing description, the “one size fits all” approach is not ideal with respect to in-ear listening devices. In addition to the discomfort of the occlusion effect, the wearers' subjective preferences and sensitivities to modifications of their own voice by the occlusion effect also varies, with some users tolerating more modification of their own voice than others. In addition, the amount of amplification applied by the listening device to combat hearing impairment or provide desired augmentation varies widely and is dependent on unique characteristics of a user's impairment, for example, defined by an audiogram measurement, or environment.
Medically-prescribed hearing aids are typically fit by a professional, who in the fitting process selects an appropriately sized vent based on perceived and measured needs of the user. However, the need for a professional to select an in-ear listening device to address the subjective hearing requirements of the user limits the commercial availability of the device. Personal sound amplification devices and consumer headphones have similar issues with occlusion and stability, and efforts are being made to expand the availability of medical hearing aids by removing the requirement for a professional fitting.
Provided are a system and method for selecting an ear tip for a hearing aid or other in-ear listening device according to a user-defined balance of occlusion and gain values. Here, a number of ear tips having various vent sizes and/or numbers may be presented to a user, for example, packaged with the listening device for selection by the user. The user is provided an opportunity to select an ear tip having a particular vent configuration by evaluating the different ear tips for performance unique to the user. Here, the user can strike a balance between quality of their own voice and a maximum amount of stable gain. In addition to individual ear tips having different potential leaks, a similar methodology could be used to allow for a single ear tip or an earbud to accept several sizes of vents. A vent is preferably acoustically coupled to the ear canal volume with little impedance at low frequency so the front cavity plastics is just as useful as the ear tip for placing a vent.
For example, as shown in
This allows for multiple combinations of ear tip sizes with vent sizes with a simple summation of parts rather than a multiplication. Users can therefore independently select the proper ear tip size that fits their ear the best and independently select a vent that balances the occlusion and feedback gain they desire, for example, illustrated in the user interface display of
In some examples, a system is provided that automatically identifies an ear tip, or more specifically, the vent of the ear tip, allowing the self-fitting assistance processing system to automatically update the tuning of one or more parameters such as dynamic range compression parameters, equalization parameters, output limits, bandwidth limits, configuration of a feedback suppressor, a gain limit, feedback and/or feed-forward filter design, and so on. An example of a self-fitting assistance processing system is described in U.S. Pat. No. 9,131,321, incorporated by reference herein in its entirety. Accordingly, the system and method according to these examples may reduce the need for the user or professional to reconfigure an in-ear listening device simply based on the acoustic changes imposed by the different vent size.
In some examples, the system may incorporate a self-fitting technology, for example, operating in connection with a computer processor-executed application that applies signal processing to the sound picked up by the listening device's microphone(s) to enhance the sound, for example, the Bose Hear application from Bose Corporation. Here, the system may generate a result to assist the wearer in an ear tip selection, for example, generating a message for display that “a gain limit has been reached for this ear tip. Please insert another ear tip for more amplification.” The message may be more specific, e.g., “please try the blue ear tip,” where the blue ear tip has a smaller vent than the ear tip the system believes the user is currently trying. In another example, the system may suggest that, given the user has selected a low gain setting, they may find a more open tip more comfortable.
Referring to
Since an ear tip 12 or earbud may include a customization component such as an ear tip vent passage 14 or related component of the earbud 10 that controls dimensions of a passage through the earbud 12, or venting, the user may wish to select an ear tip 12 having a different vent size, number, or other configuration. The ear tips 12 may be of different sizes, shapes, or other configurations relevant to the user's subjective evaluation of the tips 12 in striking a personal balance between quality of their own voice and maximum amount of stable gain. In other examples, a single ear tip 12, for example, 12A, may be configured to support different vent passages, for example, 14A, 14B, or 14C (generally, 14), thereby changing an acoustic characteristic of the ear tip 12.
In addition to a selected ear tip 12, the in-ear listening device 10 includes at least one microphone that picks up the sounds, a processor that enhances the sounds, and a speaker to deliver the sounds. As part of the sound enhancement, the processor may amplify the incoming sound according to an input received from a self-fitting assistance processing system 20, which can control the amount of gain added or reduced. The self-fitting assistance processing system 20 may provide remote control for the listening device 10. The processor of the in-ear listening device 10 may include active noise reduction (ANR) circuitry for blocking out ambient noise, and for adjusting the acoustical impedance of the occlusion at the eardrum and so removes the feeling of the stuffed ear and fullness which is a frequent complaint of hearing aid users.
A user interface of the self-fitting assistance processing system 20 can be used to recommend ear tips, e.g., via a display or audio output. The user interface may include program code that is stored at and executed by a hardware processor of the self-fitting assistance processing system 20. The self-fitting assistance processing system 20 may communicate with the listening device 10 using a wireless technology, such as Bluetooth™ or the like. The processing system 20 may also communicate with the listening device, or an ear tip or earbud, with wires, and imbedded, onboard circuitry and communicates with the user via voice prompts or the like.
The in-ear listening device 10 may include a sensing device that receives and processes signals used for tip and/or vent identification. For example, the sensing device may include an electrical contact circuit, Hall Effect sensor, mechanical switch, or other sensing technology that can uniquely identify the tip and/or vent currently being used. Users will also have a means to identify different ear tips and/or vents. For example, referring to
At block 102, an ear tip among ear tips 12A-12C is selected. This selected ear tip may be referred to as a default ear tip, from which other ear tips of interest may be compared.
At block 104, the audio gain of the in-ear listening device 10 is adjusted by a gain control device of the device 10, for example, increased. A user with some hearing loss may tolerate more occlusion and can therefore request a higher gain. At decision diamond 106, the user of the selected ear tip 12 determines whether the ear tip 12 is acceptable. If the selected ear tip 12 is acceptable to the user, in particular, the wearer is satisfied with the gain level offered by the listening device 10 including the selected ear tip, then the method 100 proceeds to block 108, wherein the user may acquire the selected ear tip 12, for example, purchases the ear tip 12. Otherwise, the method 100 proceeds to block 110, where a different ear tip 12 may be selected, for example, according to the table 200 shown in
An example may include a user inserting a listening device 10 having the red ear tip 12C, more specifically, having a large vent size of 3 mm. This particular user may desire more gain and can tolerate some occlusion, and therefore can accommodate an ear tip with a smaller vent size, for example, the green tip 12B, which may have a vent size of 2 mm. This user may opt for more occlusion but in doing so accommodates for higher potential gain.
The table 200 may be displayed at a user interface of the self-fitting assistance processing system 20 for assisting a user in selecting an ear tip for an in-ear listening device, in accordance with some examples. The table 200 may be used to execute some or all of the method 100 of
The displayed table 200 may be arranged to include a plurality of regions, each corresponding to an ear tip 12 having different characteristics. For example, as shown in
Some users, in particular, those users experiencing some hearing loss, may be less sensitive to the occlusion effect, and desire to use an ear tip 12, or vent of the currently used ear tip 12, that provides for higher gain than the red tip 12C, i.e., a gain level that is higher than a first gain threshold corresponding to a maximum gain level of the red tip 12C. The first gain threshold may be a preset gain limit. Alternatively, the maximum gain may be adjusted based on the tip 12 that is automatically detected. Here, the user is notified, for example, by an electronic message, that the user should consider changing tips if the user consistently uses the device at or near the gain limit. In a related example, the user may receive a recommendation that a larger vent be used for better occlusion if the system determines that the user does not use high gain. Thus, the user may listen to sounds when the gain of the red tip 12C is less than the first gain threshold, and if not pleased with the result, may be guided to consider a different ear tip, such as the green tip 12B, which has a gain range between the first gain threshold and a second gain threshold. The display in
If a user desires a different configuration, for example, higher gain, then the user can insert the different vent into the current ear tip 12, or select a new ear tip with a different integrated vent size. For example, the green tip 12B having a smaller vent 14B may be selected. The user or the self-fitting assistance processing system 20 via communication with the listening device 10 may identify this selected tip 12B and/or vent 14B, so that the system can process the gain and occlusion capabilities of the selected ear tip 12B. In some examples, the system automatically detects and identifies the tip 12B and/or vent as being the selected tip 12B. The self-fitting assistance processing system 20 can increase the gain at the green tip 12B within a gain range known by the system 20 to be available. The user may now evaluate the green tip 12B in view of the offered gain balanced against the occlusion characteristics of the green tip 12B.
A similar operation may be performed when comparing the green tip 12B to a blue tip 12A, which refers to a tip having a small vent 14A or no vent, and where the highest gain offered, i.e., a second gain threshold corresponding to a maximum gain level of the blue tip 12B among the available ear tips 12A-12C in view of the smallest vent 14A. The high amount of occlusion caused by this ear tip may be unacceptable to individuals with normal hearing or mild hearing loss. However, only users with moderate to severe hearing loss are likely to need the amount of gain allowed with this tip, and high occlusion is less likely to be an issue with these users.
At step 302, a default ear tip 12, for example, red tip 12C, is inserted into a user's ear. The default tip 12 may be coupled to a listening device 10 which may include well-known components such as a microphone, sound input, battery, volume control, storage device, and on-off switch (not shown). In addition, the listening device 10 may include a sensing device 16 for automatically identifying the ear tip 12, or more specifically, the vent 14 inserted in the ear tip 12. The sensing device may be a Hall Effect sensor, electrical switch, mechanical element, transducer, or other acoustic sensing device that detects the inserted vent 14. The sensing device will output a different electrical signal depending on which leak is installed that can then be interpreted by the processing system. More specifically, the sensing device 16 receives and processes signals for identifying the vent, and determines whether the identified vent is appropriate for the amount of gain determined to be used by the user. A-priori knowledge may be used to gauge whether a vent is appropriate, for example, laboratory measurements made on a group of users wearing different sized vents, resulting in a gain to vent mapping that could be stored in device memory. The mapped data may be modified by detecting a frequency of oscillation or other technique.
At step 304, a signal may be output from the listening device 10 to the self-fitting assistance processing system 20, which includes an identification of the vent 14 inserted in the ear tip 12, since in some examples, the ear tip 12 can accommodate different replaceable vents 14. At block 306, the self-fitting assistance processing system 20 may automatically update tuning parameters, such as dynamic range compression parameters, equalization parameters, output limits, bandwidth limits, configuration of a feedback suppressor, a gain limit, feedback and/or feed-forward filter design, and so on, for example, used to generate the table 200 shown in
In other applications, ear tips or earbuds may be selected according to performance requirements other than gain and occlusion. For example, a user may select a particular vent, for example, a large vent providing for less output at low frequencies, or sealed vent, when the user is listening to music, for example, streamed from a digital electronic device. This application-specific vent may be removed and replaced with a different vent, for example, a closed (or smaller) vent for hearing assistance. The self-fitting assistance processing system 20 may be used to modify the gain configuration accordingly, and may produce a display similar to table 200 in
