WO2023150225A1

WO2023150225A1 - In-ear temperature sensors for ar/vr applications and devices

Info

Publication number: WO2023150225A1
Application number: PCT/US2023/012214
Authority: WO
Inventors: Nils Thomas Fritiof Lunner; Joshua Weiner; Morteza KHALEGHIMEYBODI; Andrew John Ouderkirk; Barry David Silverstein; John Rumsfeld
Original assignee: Meta Platforms Technologies, Llc
Priority date: 2022-02-02
Filing date: 2023-02-02
Publication date: 2023-08-10
Also published as: TW202345746A

Abstract

An in-ear device for immersive reality applications is provided. The device includes an in-ear fixture configured to seal an ear canal of a user, a temperature sensor mounted on the in-ear fixture and configured to receive a temperature signal from the ear canal of the user, and a processor that is coupled to an augmented reality headset, the processor configured to identify a health condition of the user based on the temperature signal. A method for using the above device, a memory storing instructions and a processor that executes the instructions to perform the method are also provided.

Description

IN-EAR TEMPERATURE SENSORS FOR AR/VR APPLICATIONS AND DEVICES

TECHNICAL FIELD

[0001] The present disclosure is related to temperature sensors for use in virtual reality and augmented reality environments and devices. More specifically, the present disclosure is related to temperature sensors configured to determine inner body temperature for health monitoring within in-ear devices for immersive reality applications.

BACKGROUND

[0002] Current in-ear devices (e.g, hearing aids, hearables, headphones, earbuds, and the like) for mobile and immersive applications are typically bulky and uncomfortable for the user. Adding health sensing capabilities to in-ear devices is hindered by the small form factors desirable in such devices and the complex data processing and analysis involved.

SUMMARY

[0003] In a first embodiment, a device includes an in-ear fixture configured to seal an ear canal of a user, a temperature sensor mounted on the in-ear fixture and configured to receive a temperature signal from the ear canal of the user, and a processor that is coupled to an augmented reality headset, the processor configured to identify a health condition of the user based on the temperature signal.

[0004] In some embodiments, the temperature sensor may be a contact sensor including a thermocouple electrode adjacent to a skin portion of the ear canal of the user.

[0005] In some embodiments, the temperature sensor may comprise an infrared detector configured to receive an infrared radiation emitted from a body of the user and transmitted through the ear canal.

[0006] In some embodiments, the temperature sensor may comprise a filter to select a radiation bandwidth based on a signal range and a range of bodily temperatures.

[0007] In some embodiments, the temperature sensor may comprise a radiation emitter for calibration of the temperature signal based on an emissivity and an absorptivity of a tissue in the ear canal of the user for a radiation bandwidth used by the temperature sensor.

[0008] In some embodiments, the temperature sensor may be an optical sensor operating with an infrared radiation, the optical sensor including a lens to collect the infrared radiation from a selected point in the ear canal.

[0009] In some embodiments, the temperature sensor may be an optical sensor operating with infrared radiation in a bandwidth within 2 and 4 microns, or within 8 and 14 microns.

[0010] In some embodiments, the temperature sensor may include an electrical sensor including at least one of a thermocouple or a thermistor. [0011] In some embodiments, the processor may be configured to combine a waveform with the temperature signal and a waveform with a second temperature signal from an opposite ear of the user to form a combined temperature waveform with reduced noise.

[0012] In some embodiments, the device may further comprise at least one microphone or a motion sensor configured to provide a cardiovascular signal, wherein the health condition of the user is based on the temperature signal and the cardiovascular signal.

[0013] In a second embodiment, a computer-implemented method includes receiving, from a temperature sensor, a temperature signal indicative of an inner body temperature of a user of an in-ear device, forming a temperature waveform with the temperature signal, and identifying a health condition of the user of the in-ear device based on the temperature waveform.

[0014] In some embodiments, receiving a temperature signal may comprise collecting, with an infrared detector and a filter, an infrared radiation in a pre-selected bandwidth from an ear canal of the user.

[0015] In some embodiments, receiving a temperature signal may comprise filtering an infrared radiation within a bandwidth based on a detection sensitivity over a bodily temperature range.

[0016] In some embodiments, the computer-implemented method may further comprise modeling a black body emitter having a selected emissivity of an ear canal of the user within a selected bandwidth, and determining the inner body temperature based on the selected emissivity of the ear canal.

[0017] In some embodiments, receiving a temperature signal may comprise emitting an infrared radiation into an ear canal of the user and determining an emissivity and absorbance of a tissue in the ear canal within a pre-selected bandwidth to calibrate the temperature signal. [0018] In some embodiments, the computer-implemented method may further comprise receiving, from at least one microphone or a motion sensor, a cardiovascular signal, wherein identifying the health condition of the user is based on the temperature waveform and the cardiovascular signal.

[0019] In some embodiments, receiving a temperature signal may comprise providing an infrared radiation to an in-ear canal and collecting a backscattered infrared radiation to calibrate an emissivity value and absorbance value for the in-ear canal into the temperature waveform.

[0020] In some embodiments, receiving a temperature signal may comprise receiving a voltage value from a thermocouple electrode in contact with an in-ear canal of the user.

[0021] In some embodiments, identifying a health condition of the user may comprise identifying a pattern in the temperature waveform indicative of a disease onset. [0022] In some embodiments, identifying a health condition of the user may comprise correlating the temperature waveform with cardio-respiratory vital signs of the user.

[0023] In a third embodiment, a non-transitory, computer-readable medium stores instructions which, when executed by one or more processors, cause a computer to execute a method. The method includes receiving, from a temperature sensor, a temperature signal indicative of an inner body temperature of a user of an in-ear device, forming a temperature waveform with the temperature signal, and identifying a health condition of the user of the in- ear device based on the temperature waveform.

[0024] In yet other embodiments, a system includes a first means to store instructions and a second means to execute the instructions to cause the system to perform a method. The method includes receiving, from a temperature sensor, a temperature signal indicative of an inner body temperature of a user of an in-ear device, forming a temperature waveform with the temperature signal, and identifying a health condition of the user of the in-ear device based on the temperature waveform.

[0025] These and other embodiments will become clear for one with ordinary skill, in view of the following. It will be appreciated that any features described herein as being suitable for incorporation into one or more aspects or embodiments of the present disclosure are intended to be generalizable across any and all aspects and embodiments of the present disclosure. Other aspects of the present disclosure can be understood by those skilled in the art in light of the description, the claims, and the drawings of the present disclosure. The foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the claims.

BRIEF DESCRIPTION OF THE FIGURES

[0026] FIG. 1 illustrates an AR headset and an in-ear monitor (IEM) in an architecture configured to assess a user’s health, according to some embodiments.

[0027] FIG. 2 illustrates an augmented reality ecosystem including wearable devices in the ear and wrist to assess a user’s health, according to some embodiments.

[0028] FIGS. 3A-3C illustrate different embodiments of an in-ear monitor (IEM), according to some embodiments.

[0029] FIG. 4 illustrates an optical temperature sensor in an IEM, according to some embodiments.

[0030] FIG. 5 illustrates a temperature sensor configured as a contact electrode to touch the skin in the ear canal where the in-ear fixture is placed, according to some embodiments.

[0031] FIG. 6 is a flow chart illustrating steps in a method for using temperature sensors in an in-ear monitor for assessing the health of a user of a headset or smart glass, according to some embodiments.

[0032] FIG. 7 is a block diagram illustrating an exemplary computer system with which headsets and other client devices, and the method in FIG. 6 be implemented, according to some embodiments.

[0033] In the figures, elements having the same or similar reference numeral are associated with the same or similar features and attributes, unless explicitly stated otherwise.

DETAILED DESCRIPTION

[0034] In the following detailed description, numerous specific details are set forth to provide a full understanding of the present disclosure. It will be apparent, however, to one ordinarily skilled in the art, that the embodiments of the present disclosure may be practiced without some of these specific details. In other instances, well-known structures and techniques have not been shown in detail so as not to obscure the disclosure.

General Overview

[0035] Head- worn devices (e.g. , devices worn on head including but not limited to hearables, glasses, AR/VR headsets and smart glasses, etc.) offer opportunities to access valuable health information.

[0036] The ear (e.g., the ear canal and ear concha) has close proximity to the brain, to body chemistry, and blood vessels indicative of brain activity and cardio-respiratory activity, and inner body temperature. More specifically, sensors can be placed inside the ear canal or around the ear (in the case of AR/VR headsets or smart glasses) to sense the brain, heart, and electrophysiological activities (e.g., electro-encephalography EEG, electro-cardiography ECG, electro-oculography, EOG, electrodermal activity, EDA, and the like); or to sense vital signs (heart rate, breathing rates, blood pressure, body temperature, and the like); or to sense the body chemistry (e.g. , blood alcohol level, blood glucose estimation, and the like). Temperature measurements in the ear are attractive because the ear is close to the inner body temperature. For example, an artery going through the ear drum feeds directly through the hypothalamus, which is the part of the brain that controls body temperature. In addition, the high density of blood vessels and nerve structures in the ear canal make it an information-rich area that is convenient to access from the point of view of continuous monitoring and measurement.

[0037] Electrodes in embodiments as disclosed herein may be used in EOG, ECG, or EEG measurements, e.g., for determining auditory attention; heart rate estimation, breathing rate, and the like, Auditory Steady State Response -ASSR-, or auditory brainstem response -ABR-. In some embodiments, in-ear electrodes as disclosed herein may be useful to measure resting state electric oscillations (alpha waves in an EEG) that can track relaxation/activity. With the combination of other measurements (e.g, photoplethysmography, PPG), a new branch of diagnostic possibilities is open. In-ear EEG measurements can be applied to track user attention (e.g, distinguishing between attention focus from eye gaze direction).

[0038] Methods and devices disclosed herein include optical, acoustical, motion sensors, chemical sensors, and temperature sensors, in and around the ears of AR/VR headset users, in combination with software correlation of the signals provided by the above sensors to generate comprehensive diagnostics and health evaluation of the user.

[0039] Some of the features disclosed herein include in-ear or head-wom body temperature sensing using infrared sensing and spectroscopy techniques. In some embodiments, the contact area for sensors as disclosed herein include the in-ear canal (like an in-ear earbud) and within the conchal bowl (in human pinna), areas on top of the human ear (where the glasses sit), and areas in the nose-pad of a headset or smart glass (where glasses sit on the nose). Some measurements may include in-ear or around the ear sensing of glucose level, alcohol sensing, body temperature, blood pressure, and the like. Some embodiments include pulse transit time (PTT) methodology to estimate blood pressure for a glasses/headset device using a combination of optical and electrical signals (e.g, PPG + ECG sensors respectively) or using a combination of electrical and acoustical or motion-based information (e.g, ECG + acoustic or motion sensors respectively). Some embodiments obtain user’s blood pressure using an optical sensing technique (PPG) in combination with a deep neural network to train a network based using both PPG information and a corresponding ground-truth blood pressure information. Some embodiments obtain user’s blood pressure using an optical sensing technique with multiple distinct optical wavelengths and using a technique called multiwavelength pulse transit time photoplethysmography (MWPTT PPG) in combination with a deep neural network to train a network based using both PPG information and a corresponding ground-truth blood pressure information. Some embodiments include motion-based pulse transit time (PTT) methodology to estimate blood pressure for a glass/headset device using a combination of motion sensor and electrical signals (e.g, IMU + ECG sensors respectively). Once fully trained, the neural network can then quantify and predict the user’s blood pressure using just the PPG information and leveraging this pre-trained network. To further improve the accuracy, some subjective calibrations may be desirable. In some embodiments, PPG signals collected in IEM devices as disclosed herein may be able to estimate the cognitive load on the user with analysis of oxygenated and deoxygenated blood flow (oxy- and deoxyhemoglobin) to the brain. Some embodiments include sensing alcohol levels through emissions around the ear. Some embodiments incorporate chemical sensing intake around the contact points of the ear. In some embodiments, IEM devices may perform alcohol monitoring and fat burning during user exercise.

[0040] There have been attempts to use infrared ear thermometers to measure ear-drum temperature, which is an accurate location of assessing inner-body temperature. However, these efforts are hindered by the inability to precisely direct the sensor measurements towards the eardrum. When the sensor targets not only the eardrum, but other parts of the ear (e.g., inner skin and the like), the measure is averaged on the whole of the measured surface, rendering an inaccurate value. Accordingly, these measurements are typically performed by trained medical personnel, in a clinic environment.

[0041] To resolve the above technical problem, embodiments as disclosed herein include an in-ear fixture having a hermetic, heat-insulating seal that reduces air circulation and a possible thermal load heating the air in the ear canal. Additionally, some embodiments include estimating the fixture temperature and incorporating this value with the ear drum measurement in a heat transfer model that determines the inner body temperature. Moreover, embodiments as disclosed herein may incorporate automatically steering emitters and detectors to adjust the sensors direction and find an accurate measurement location in the ear canal (e.g. , the eardrum). Additionally, in some embodiments an IR sensor sensitive to the mid or far-lR may also have a small number of pixels to select the most accurate region for signal capture.

Example System Architecture

[0042] FIG. 1 illustrates an AR headset 110-1 and an in-ear monitor (IEM) 100 in an architecture 10 configured to assess the health of a user 101, according to some embodiments. IEM 100 is inserted in the ear 170 of user 101, reaching the ear canal 161. AR headset 110-1 may include smart glasses having a memory circuit 120 storing instructions and a processor circuit 112 configured to execute the instructions to perform steps as in methods disclosed herein. AR headset 110-1 (or smart glasses) may also include a communications module 118 configured to wirelessly transmit information (e.g., Dataset 103-1) between AR headset 110-1 (and/or in-ear device 100, and/or a smart watch, or combination of the above) and a mobile device 110-2 with the user (AR headset 110-1 and mobile device 110-2 will be collectively referred to, hereinafter, as “client devices 110”). Communications module 118 may be configured to interface with a network 150 to send and receive information, such as dataset 103-1, dataset 103-2, and dataset 103-3, requests, responses, and commands to other devices on network 150. In some embodiments, communications module 118 can include, for example, modems or Ethernet cards. Client devices 110 may in turn be communicatively coupled with a remote server 130 and a database 152, through network 150, and transmi t/share information, files, and the like with one another (e.g., dataset 103-2 and dataset 103-3). Datasets 103-1, 103-2, and 103-3 will be collectively referred to, hereinafter, as “datasets 103.” Network 150 may include, for example, any one or more of a local area network (LAN), a wide area network (WAN), the Internet, and the like. Further, the network can include, but is not limited to, any one or more of the following network topologies, including a bus network, a star network, a ring network, a mesh network, a star-bus network, tree or hierarchical network, and the like. [0043] In some embodiments, at least one of the steps in methods as disclosed herein are performed by processor 112, providing dataset 103-1 to mobile device 110-2. Mobile device 110-2 may further process the signals and provide dataset 103-2 to database 152 via network 150. Remote server 130 may collect dataset 103-2 from multiple AR headsets 110-1 and mobile devices 110-2 in the form and perform further calculations. In addition, having aggregated data from a population of individuals, the remote server may perform meaningful statistics. This data cycle may be established provided each of the users involved have consented for the use of de-personalized, or anonymized data. In some embodiments, remote server 130 and database 152 may be hosted by a healthcare network, or a healthcare facility or institution (e.g, hospital, university, government institution, clinic, health insurance network, and the like). Mobile device 110-2, AR headset 110-1, in-ear device 100, and applications therein may be hosted by a different service provider (e.g, a network carrier, an application developer, and the like). Moreover, AR headset 110-1 and mobile devices 110-2 may proceed from different manufacturers. User 101 is ultimately the sole owner of dataset 103-1 and all data derived therefrom (e.g., datasets 103), and so all the data flows (e.g, datasets 103), while provided, handled, or regulated by different entities, are authorized by user 101, and protected by network 150, server 130, database 152, and mobile device 110-2 for privacy and security.

[0044] FIG. 2 illustrates an augmented reality ecosystem 200 including wearable devices in the ear 205-1 (e.g, an IEM), wrist 205-2, chest 205-3, and smart glass sensors 205-4 to assess the health of user 201, according to some embodiments. In some embodiments, IEM 205-1 further includes an optical sensor configured to provide an optical signal 220-1 to a processor in a computer 240 via a data acquisition module (DAQ) 230. IEM 205-1 may further include one or more contact electrodes configured to provide an electrical signal to a processor in a computer 240 via a data acquisition module (DAQ) 230. Computer 240 is configured to identify a cardiovascular condition of user 201 based on a first electronic signal from IEM 205- 1 and optical signal 220-1. In some embodiments, IEM 205-1 further includes amotion sensor (e.g, an accelerometer, a contact microphone, or an IMU) configured to provide a motion- based signal to computer 240 via DAQ 230. In some embodiments, a pair of IEMS 205 will be placed in both ears and different optical, electrical (electrode), acoustic (microphone), or motion sensors (accelerometer, IMU, contact microphone, etc.) may be placed in either both sides; or in some cases, some sensors may be placed on one side (e.g., the Right side) and some other sensors may be placed on the other side (e.g., Left side). Computer 240 is configured to identify a cardiovascular condition of the user based on a first electronic signal from IEM 205- 1 and the motion signal. The optical sensor may be a photo-plethysmography (PPG) sensor and optical signal 220-1 may include a digital or analog signal indicative of a vascular activity inside the ear of user 201. Chest sensors 205-3 and smart glass sensors 205-4 may include ECG sensors to provide a distributed signals 220-3 and 220-4 from one or more areas around the chest and face (e.g, the outside of the ear, the chin, and the nose) of user 201, respectively (or alternatively an ECG can be collected from some electrodes placed on areas on the head or from electrodes placed in IEM 205-1, or electrodes placed on the wrist device 205-2), and a wrist PPG sensor in device 205-2 may provide a separate signal 220-2 for vascular activity around the wrist of user 201. IEM 205-1, wrist sensor 205-2, chest sensors 205-3, and smart glass sensors 205-4 will be collectively referred to, hereinafter, as “wearable devices (and sensors) 205.” Blood pressure (BP) measurements may be obtained with a cuff or cuff-less BP monitor 210 and may also be determined by comparing PPG signals 220-1 and 220-2. Signals 220-1, 220-2, 220-3 and 220-4 (hereinafter, collectively referred to, hereinafter, as “signals 220”) may be collected and digitized by DAQ 230 in computer 240, for processing. In some embodiments, signals 220 and others may be wired, or wireless. In some embodiments, it may be preferable to have wireless signal communication between the different wearable devices 205 with user 201. In some embodiments, wearable devices and sensors 205 may include one or more motion sensors, and the motion-based information collected from the smart glass, the IEM, chest or wrist can be combined to create a more meaningful information.

[0045] FIGS. 3A-3C illustrate different embodiments of an in-ear monitor (IEM) 300A, 300B, and 300C (hereinafter, collectively referred to as “IEMs 300”), according to some embodiments. IEMs 300 may include a front end 301-1 including sensors and open to ear canal 361 and ear drum 362, and aback end 301-2 including a processor 312. IEMs 300 may include sensors such as: an electrode 305 to sense electrical signals, acoustic sensors 325-1 and 325-2 (e.g, collectively referred hereinafter, as “microphones 325”), motion sensors 327 (e.g, accelerometers, contact microphones, inertial motion units -IMUs, and the like), temperature sensors 329, and optical sensors including an emitter 321 and a detector 323 (e.g., LEDs and PDs in PPG sensors, functional near-infrared fNIR sensors -Fourier transform based, spectroscopic based-). Electrodes 305 may include bio-potential electrodes for applications such as EEG, ECG, EOG, and EDA). In addition, processor 312 may handle at least some of the operations for signal acquisition and control of components and sensors 321, 323, 324 (a speaker), 325-1 (internal microphone), 325-2 (external microphone, hereinafter, collectively referred to as “microphones 325”), 327, and 329 via a digital-to-analog and/or analog-to-digital converter (DAC/ADC) 330. Processor 312 may include a feedforward stage 31 Iff and a feedback stage 31 Ifb that cooperate to process the signal from the sensors: noise reduction, balancing, filtering, and amplification.

[0046] In some embodiments, electrodes 305 include a contact electrode configured to transmit a current from the skin in the ear canal of the user. In some embodiments, an electrode 305 is coated with at least one of a gold layer, a silver layer, a silver chloride layer, or a combination thereof. In some embodiments, electrodes 305 include a capacitive coupling electrode disposed sufficiently close, but not in contact, with the user’s skin. In some embodiments, IEMS 300 further include at least a second electrode 305 mounted on in-ear fixture 340, the second electrode 305 configured to receive a second electronic signal from the skin in ear canal 361. In some embodiments, processor 312 is configured to select the first electronic signal when a quality of the first electronic signal is higher than a pre-selected threshold. In some embodiments, processor 312 is configured to reduce a noise background from the first electronic signal with the second electronic signal. In some embodiments, processor 312 is configured to determine a heart rate of the user from the first electronic signal. In some embodiments, processor 312 is configured to determine a brain activity from the first electronic signal that corresponds to an acoustic stimulus received in the external microphone. [0047] IEMs 300 in the AR headset or smart glasses may include an in-ear fixture 340 configured to hermetically seal an ear canal of a user, a first electrode 305 mounted on in-ear fixture 340 and configured to receive a first electronic signal from a skin in ear canal 361, and an internal microphone 325-1 coupled to receive an internal acoustic signal, propagating through ear canal 361. An acoustic front end includes internal microphone 325-1 configured to detect acoustic waves (xBc(t)) propagated through ear canal 361 and generated by the inner body (e.g, heart rate at about <100Hz, breathing rate at about 50-1000Hz, and other sounds in the laryngeal cavity). An external microphone 325-2 is coupled to receive an external acoustic signal x(t), propagating through an environment of the user. In some embodiments, the internal signal XBc(t) in conjunction with the external signal x(t) may be used in acoustic procedures such as audio streaming, hear-through, active noise cancelation (ANC), hearing corrections, virtual presence and spatial audio, call services, and the like. In some embodiments, at least some of the above processes are performed in conjunction between left-ear and right-ear IEM monitors 300.

[0048] IEM 300B includes a sealing gasket 341 that separates the inner portion of ear canal 361 from the environment, leaving a back-volume vent including an acoustically resistive mesh 344 for a pressure equalizer (PEQ) tube 342 to vent into resistive mesh 344 (also shown in IEM 300C). The sealed cavity may enable breathing and heart rate monitoring (e.g., isolating the signal from internal acoustic microphone 325-1) at low power usage and with a small form factor. In some embodiments, sealing gasket 341 includes a low thermal conductivity material, and is configured to hermetically seal the ear canal from the external environment. Accordingly, sealing gasket 341 may be configured to thermally insulate ear canal 361 and eardrum 362 from the exterior environment or even from the thermal load of in-ear fixture 340. [0049] IEM 300C illustrates processor circuit 312 to identify a cardiovascular condition or a neurologic condition of the user, based on at least one of a first electronic signal, an internal acoustic signal, and an external acoustic signal (e.g., from microphones 325). Some embodiments may include a down cable 345 to electrically couple the IEM with the VR headset or smart glasses, including a strain relief 343.

[0050] FIG. 4 illustrates an optical temperature sensor 429 in an IEM 400, according to some embodiments. Optical temperature sensor 429 as disclosed herein may include a detector of infrared radiation (IR) mounted on an in-ear fixture 440 of the IEM. Different ranges of IR radiation (X~l pm to ~20 pm) may be selected based on detector and source availability and complexity. In some embodiments, a preferred wavelength range may be / ~2.5 pm to ~4 pm, or X~8 pm to ~14 pm. In some embodiments, optical temperature sensor 429 may include an IR emitter 421 that emits IR light in the same bandwidth that is detected (by a detector 430) for calibration purposes (e.g, to determine emissivity and absorptivity of the target tissue at the selected wavelength). Accordingly, a calibration step may include illuminating the in-ear canal with IR radiation and collecting the backscattered radiation. The intensity of backscattered radiation provides an absorbance value for the in-ear canal, when compared to the illuminating radiation intensity. An emissivity value may be determined with the absorbance value and a black body radiation model. A flex connector 442 provides power to and collects the signal from IR detector 430. The signal is provided to a processor for data filtering, analysis, and measurement. As illustrated, IR detector 430 may be facing a side of in-ear fixture 440 that is in close proximity or in contact with the skin inside the ear cavity. Accordingly, the IR radiation produced by different tissues in the ear canal (including skin, blood vessels, the ear drum, and the like) illuminates IR detector 430 and produces a signal indicative of body temperature. In some embodiments, the heat emanated from the skin of the ear-canal can be directly sensed by the infrared detector sensor based on the Planck’s Law (using Stefan-Boltzmann constant). The infrared detector or array of IR detectors or IR pixels (in IR detector 429) may be constructed as a grid of pixels, each of which reacts to the infrared wavelengths, emanated from the ear-canal skin, and can convert that sensed thermal radiation into meaningful values corresponding to the core body temperature. In some embodiments, a filter 431 placed in front of the detector may select a specific bandwidth in the IR that is most responsive for temperature ranges in the order of 30-45 °C, as expected for the human body.

[0051] In some embodiments, IR sensor 429 includes a directionally adjustable emitter or detector (cf. emitter 321, detector 323), or both. Thus, the IR measurement may be directed to the eardrum for an accurate assessment of the inner-body temperature. To achieve this, a mirror (e.g, micro-electromechanical system -MEMS), a pancake lens or pancake wedge lens, or a liquid lens with an adjustable prism may selectively adjust the orientation of light generated by, or received in, IR sensor 429.

[0052] In some embodiments, the temperature sensor may be a non-optical digital or analog thermometer (thermocouple, thermistor, etc.) that can be in contact with the ear-canal skin and can create voltage output proportional to the absolute temperature with accuracies of up to ±1°C. In some embodiments, the temperature sensor may be a digital or analog thermometer that can be placed within the in-ear component and may operate in non-contact mode with the skin. The temperature from the skin of the earcanal first reaches to the in-ear device, and then eventually it reaches to the temperature sensors.

[0053] FIG. 5 illustrates an IEM 500 including a temperature sensor 529 configured as a contact electrode to touch the skin in the ear canal where in-ear fixture 540 is placed, according to some embodiments. Temperature sensor 529 may include a thermocouple alloy that determines temperature by measuring a voltage difference between the two ends of a pair of conducting alloys (one end being the electrode shown, in contact with the user skin inside the ear canal).

[0054] FIG. 6 is a flow chart illustrating steps in a method 600 for using electrodes in an in- ear monitor for assessing the health of a user of a headset or smart glass, according to some embodiments. In some embodiments, at least one or more of the steps in method 600 may be performed by a processor executing instructions stored in a memory in either one of a smart glass or other wearable device on a user’s body part (e.g, head, arm, wrist, leg, ankle, finger, toe, knee, shoulder, chest, back, and the like). In some embodiments, at least one or more of the steps in method 600 may be performed by a processor executing instructions stored in a memory, wherein either the processor or the memory, or both, are part of a mobile device for the user, a remote server or a database, communicatively coupled with each other via a network (cf., processors 112, 312, and memory 120, client devices 110, server 130, database 152, and network 150). Moreover, the mobile device, the smart glass, and the wearable devices may be communicatively coupled with each other via a wireless communication system and protocol (e.g., communications module 118, radio, Wi-Fi, Bluetooth, near-field communication -NFC- and the like). In some embodiments, a method consistent with the present disclosure may include one or more steps from method 600 performed in any order, simultaneously, quasi- simultaneously, or overlapping in time.

[0055] Step 602 includes receiving, from a temperature sensor, a temperature signal indicative of an inner body temperature of a user of an in-ear device. In some embodiments, step 602 includes collecting, with an infrared detector and a filter, an infrared radiation in a pre-selected bandwidth from an ear canal of the user. In some embodiments, step 602 includes filtering an infrared radiation within a bandwidth based on a detection sensitivity over a bodily temperature range. In some embodiments, step 602 includes modeling a black body emitter having a selected emissivity of an ear canal of the user within a selected bandwidth, and determining the inner body temperature based on the selected emissivity of the ear canal. In some embodiments, step 602 includes emitting an infrared radiation into an ear canal of the user and determining an emissivity and absorbance of a tissue in the ear canal within a preselected bandwidth to calibrate the temperature signal. In some embodiments, step 602 includes receiving, from at least one microphone or a motion sensor, a cardiovascular signal, wherein identifying the health condition of the user is based on the temperature waveform and the cardiovascular signal. In some embodiments, step 602 includes providing an infrared radiation to an in-ear canal and collecting a backscattered infrared radiation to calibrate an emissivity value and absorbance value for the in-ear canal into the temperature waveform. In some embodiments, step 602 includes receiving a voltage value from a thermocouple electrode in contact with an in-ear canal of the user. In some embodiments, step 602 includes receiving a second temperature signal from an in-ear fixture indicative of a thermal load of the IEM into the ear canal and ear drum. Accordingly, in some embodiments, step 602 includes using the first temperature signal and the second temperature signal in a heat transfer model to assess an inner-body temperature. For example, the heat transfer model may incorporate heat fluxes between the environment, the in-ear fixture, the in-ear canal, and the inner-body to identify an equilibrium point for the temperature of the ear drum associated to the inner-body temperature. [0056] Step 604 includes forming a temperature waveform with the temperature signal. [0057] Step 606 includes identifying a health condition of the user of the in-ear device based on the temperature waveform. In some embodiments, step 606 includes identifying a pattern in the temperature waveform indicative of a disease onset. In some embodiments, step 606 includes correlating the temperature waveform with cardio-respiratory vital signs of the user. Hardware Overview

[0058] FIG. 7 is a block diagram illustrating an exemplary computer system 700 with which headsets and other client devices 110, and method 600 can be implemented, according to some embodiments. In certain aspects, computer system 700 may be implemented using hardware or a combination of software and hardware, either in a dedicated server, or integrated into another entity, or distributed across multiple entities. Computer system 700 may include a desktop computer, a laptop computer, a tablet, a phablet, a smartphone, a feature phone, a server computer, or otherwise. A server computer may be located remotely in a data center or be stored locally.

[0059] Computer system 700 includes a bus 708 or other communication mechanism for communicating information, and a processor 702 (e.g., processors 112) coupled with bus 708 for processing information. By way of example, the computer system 700 may be implemented with one or more processors 702. Processor 702 may be a general -purpose microprocessor, a microcontroller, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a Programmable Logic Device (PLD), a controller, a state machine, gated logic, discrete hardware components, or any other suitable entity that can perform calculations or other manipulations of information.

[0060] Computer system 700 can include, in addition to hardware, code that creates an execution environment for the computer program in question, e.g., code that constitutes processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more of them stored in an included memory 704 (e.g., memory 120), such as a Random Access Memory (RAM), a flash memory, a Read-Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable PROM (EPROM), registers, a hard disk, a removable disk, a CD-ROM, a DVD, or any other suitable storage device, coupled with bus 708 for storing information and instructions to be executed by processor 702. The processor 702 and the memory 704 can be supplemented by, or incorporated in, special purpose logic circuitry.

[0061] The instructions may be stored in the memory 704 and implemented in one or more computer program products, e.g, one or more modules of computer program instructions encoded on a computer-readable medium for execution by, or to control the operation of, the computer system 700, and according to any method well known to those of skill in the art, including, but not limited to, computer languages such as data-oriented languages (e.g, SQL, dBase), system languages (e.g, C, Objective-C, C++, Assembly), architectural languages (e.g, Java, .NET), and application languages (e.g, PHP, Ruby, Perl, Python). Instructions may also be implemented in computer languages such as array languages, aspect-oriented languages, assembly languages, authoring languages, command line interface languages, compiled languages, concurrent languages, curly-bracket languages, dataflow languages, data-structured languages, declarative languages, esoteric languages, extension languages, fourth-generation languages, functional languages, interactive mode languages, interpreted languages, iterative languages, list-based languages, little languages, logic-based languages, machine languages, macro languages, metaprogramming languages, multiparadigm languages, numerical analysis, non-English-based languages, object-oriented class-based languages, object-oriented prototype-based languages, off-side rule languages, procedural languages, reflective languages, rule-based languages, scripting languages, stack-based languages, synchronous languages, syntax handling languages, visual languages, Wirth languages, and xml-based languages. Memory 704 may also be used for storing temporary variable or other intermediate information during execution of instructions to be executed by processor 702.

[0062] A computer program as discussed herein does not necessarily correspond to a file in a file system. A program can be stored in a portion of a file that holds other programs or data (e.g, one or more scripts stored in a markup language document), in a single file dedicated to the program in question, or in multiple coordinated files (e.g, files that store one or more modules, subprograms, or portions of code). A computer program can be deployed to be executed on one computer or on multiple computers that are located at one site or distributed across multiple sites and interconnected by a communication network. The processes and logic flows described in this specification can be performed by one or more programmable processors executing one or more computer programs to perform functions by operating on input data and generating output.

[0063] Computer system 700 further includes a data storage device 706 such as a magnetic disk or optical disk, coupled with bus 708 for storing information and instructions. Computer system 700 may be coupled via input/output module 710 to various devices. Input/output module 710 can be any input/output module. Exemplary input/output modules 710 include data ports such as USB ports. The input/output module 710 is configured to connect to a communications module 712. Exemplary communications modules 712 include networking interface cards, such as Ethernet cards and modems. In certain aspects, input/output module 710 is configured to connect to a plurality of devices, such as an input device 714 and/or an output device 716. Exemplary input devices 714 include a keyboard and a pointing device, e.g., a mouse or a trackball, by which a consumer can provide input to the computer system 700. Other kinds of input devices 714 can be used to provide for interaction with a consumer as well, such as a tactile input device, visual input device, audio input device, or brain-computer interface device. For example, feedback provided to the consumer can be any form of sensory feedback, e.g., visual feedback, auditory feedback, or tactile feedback; and input from the consumer can be received in any form, including acoustic, speech, tactile, or brain wave input. Exemplary output devices 716 include display devices, such as an LCD (liquid crystal display) monitor, for displaying information to the consumer.

[0064] According to one aspect of the present disclosure, headsets and client devices 110 can be implemented, at least partially, using a computer system 700 in response to processor 702 executing one or more sequences of one or more instructions contained in memory 704. Such instructions may be read into memory 704 from another machine-readable medium, such as data storage device 706. Execution of the sequences of instructions contained in main memory 704 causes processor 702 to perform the process steps described herein. One or more processors in a multi-processing arrangement may also be employed to execute the sequences of instructions contained in memory 704. In alternative aspects, hard-wired circuitry may be used in place of or in combination with software instructions to implement various aspects of the present disclosure. Thus, aspects of the present disclosure are not limited to any specific combination of hardware circuitry and software.

[0065] Various aspects of the subject matter described in this specification can be implemented in a computing system that includes a back end component, e.g., a data server, or that includes a middleware component, e.g, an application server, or that includes a front end component, e.g., a client computer having a graphical consumer interface or a Web browser through which a consumer can interact with an implementation of the subject matter described in this specification, or any combination of one or more such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication, e.g., a communication network. The communication network can include, for example, any one or more of a LAN, a WAN, the Internet, and the like. Further, the communication network can include, but is not limited to, for example, any one or more of the following network topologies, including a bus network, a star network, a ring network, a mesh network, a star-bus network, tree or hierarchical network, or the like. The communications modules can be, for example, modems or Ethernet cards. [0066] Computer system 700 can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. Computer system 700 can be, for example, and without limitation, a desktop computer, laptop computer, or tablet computer. Computer system 700 can also be embedded in another device, for example, and without limitation, a mobile telephone, a PDA, a mobile audio player, a Global Positioning System (GPS) receiver, a video game console, and/or a television set top box.

[0067] The term “machine-readable storage medium” or “computer-readable medium” as used herein refers to any medium or media that participates in providing instructions to processor 702 for execution. Such a medium may take many forms, including, but not limited to, non-volatile media, volatile media, and transmission media. Non-volatile media include, for example, optical or magnetic disks, such as data storage device 706. Volatile media include dynamic memory, such as memory 704. Transmission media include coaxial cables, copper wire, and fiber optics, including the wires forming bus 708. Common forms of machine- readable media include, for example, floppy disk, a flexible disk, hard disk, magnetic tape, any other magnetic medium, a CD-ROM, DVD, any other optical medium, punch cards, paper tape, any other physical medium with patterns of holes, a RAM, a PROM, an EPROM, a FLASH EPROM, any other memory chip or cartridge, or any other medium from which a computer can read. The machine-readable storage medium can be a machine-readable storage device, a machine-readable storage substrate, a memory device, a composition of matter affecting a machine-readable propagated signal, or a combination of one or more of them.

[0068] As used herein, the phrase “at least one of’ preceding a series of items, with the terms “and” or “or” to separate any of the items, modifies the list as a whole, rather than each member of the list (e.g, each item). The phrase “at least one of’ does not require selection of at least one item; rather, the phrase allows a meaning that includes at least one of any one of the items, and/or at least one of any combination of the items, and/or at least one of each of the items. By way of example, the phrases “at least one of A, B, and C” or “at least one of A, B, or C” each refer to only A, only B, or only C; any combination of A, B, and C; and/or at least one of each of A, B, and C.

[0069] The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments. Phrases such as an aspect, the aspect, another aspect, some aspects, one or more aspects, an implementation, the implementation, another implementation, some implementations, one or more implementations, an embodiment, the embodiment, another embodiment, some embodiments, one or more embodiments, a configuration, the configuration, another configuration, some configurations, one or more configurations, the subject technology, the disclosure, the present disclosure, other variations thereof and alike are for convenience and do not imply that a disclosure relating to such phrase(s) is essential to the subject technology or that such disclosure applies to all configurations of the subject technology. A disclosure relating to such phrase(s) may apply to all configurations, or one or more configurations. A disclosure relating to such phrase(s) may provide one or more examples. A phrase such as an aspect or some aspects may refer to one or more aspects and vice versa, and this applies similarly to other foregoing phrases.

[0070] A reference to an element in the singular is not intended to mean “one and only one” unless specifically stated, but rather “one or more.” Pronouns in the masculine (e.g, his) include the feminine and neuter gender (e.g, her and its) and vice versa. The term “some” refers to one or more. Underlined and/or italicized headings and subheadings are used for convenience only, do not limit the subject technology, and are not referred to in connection with the interpretation of the description of the subject technology. Relational terms such as first and second and the like may be used to distinguish one entity or action from another without necessarily requiring or implying any actual such relationship or order between such entities or actions. All structural and functional equivalents to the elements of the various configurations described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are intended to be expressly incorporated herein by reference and intended to be encompassed by the subject technology. Moreover, nothing disclosed herein is intended to be dedicated to the public, regardless of whether such disclosure is explicitly recited in the above description.

[0071] While this specification contains many specifics, these should not be construed as limitations on the scope of what may be described, but rather as descriptions of particular implementations of the subject matter. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination. Moreover, although features may be described above as acting in certain combinations and even initially described as such, one or more features from a described combination can in some cases be excised from the combination, and the described combination may be directed to a subcombination or variation of a subcombination.

[0072] The subject matter of this specification has been described in terms of particular aspects, but other aspects can be implemented and are within the scope of the following claims. For example, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. The actions recited in the claims can be performed in a different order and still achieve desirable results. As one example, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Moreover, the separation of various system components in the aspects described above should not be understood as requiring such separation in all aspects, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products.

[0073] The title, background, brief description of the drawings, abstract, and drawings are hereby incorporated into the disclosure and are provided as illustrative examples of the disclosure, not as restrictive descriptions. It is submitted with the understanding that they will not be used to limit the scope or meaning of the claims. In addition, in the detailed description, it can be seen that the description provides illustrative examples, and the various features are grouped together in various implementations for the purpose of streamlining the disclosure. The method of disclosure is not to be interpreted as reflecting an intention that the described subject matter requires more features than are expressly recited in each claim. Rather, as the claims reflect, inventive subject matter lies in less than all features of a single disclosed configuration or operation. The claims are hereby incorporated into the detailed description, with each claim standing on its own as a separately described subject matter.

[0074] The claims are not intended to be limited to the aspects described herein, but are to be accorded the full scope consistent with the language claims and to encompass all legal equivalents. Notwithstanding, none of the claims are intended to embrace subject matter that fails to satisfy the requirements of the applicable patent law, nor should they be interpreted in such a way.

Claims

1. A device, comprising: an in-ear fixture configured to seal an ear canal of a user; a temperature sensor mounted on the in-ear fixture and configured to receive a temperature signal from the ear canal of the user; and a processor that is coupled to an augmented reality headset, the processor configured to identify a health condition of the user based on the temperature signal.

2. The device of claim 1, wherein the temperature sensor is a contact sensor including a thermocouple electrode adjacent to a skin portion of the ear canal of the user.

3. The device of claim 1 or claim 2, wherein the temperature sensor comprises an infrared detector configured to receive an infrared radiation emitted from a body of the user and transmitted through the ear canal.

4. The device of claim 1, claim 2 or claim 3, wherein the temperature sensor comprises a filter to select a radiation bandwidth based on a signal range and a range of bodily temperatures.

5. The device of any one of the preceding claims, wherein the temperature sensor comprises a radiation emitter for calibration of the temperature signal based on an emissivity and an absorptivity of a tissue in the ear canal of the user for a radiation bandwidth used by the temperature sensor.

6. The device of any one of the preceding claims, wherein the temperature sensor is an optical sensor operating with an infrared radiation, the optical sensor including a lens to collect the infrared radiation from a selected point in the ear canal.

7. The device of any one of the preceding claims, wherein the temperature sensor is an optical sensor operating with infrared radiation in a bandwidth within 2 and 4 microns, or within 8 and 14 microns.

8. The device of any one of the preceding claims, wherein the temperature sensor includes an electrical sensor including at least one of a thermocouple or a thermistor.

9. The device of any one of the preceding claims, wherein the processor is configured to combine a waveform with the temperature signal and a waveform with a second temperature signal from an opposite ear of the user to form a combined temperature waveform with reduced noise.

10. The device of any one of the preceding claims, further comprising at least one microphone or a motion sensor configured to provide a cardiovascular signal, wherein the health condition of the user is based on the temperature signal and the cardiovascular signal.

11. A computer-implemented method, comprising: receiving, from a temperature sensor, a temperature signal indicative of an inner body temperature of a user of an in-ear device; forming a temperature waveform with the temperature signal; and identifying a health condition of the user of the in-ear device based on the temperature waveform.

12. The computer-implemented method of claim 11, further comprising modeling a black body emitter having a selected emissivity of an ear canal of the user within a selected bandwidth, and determining the inner body temperature based on the selected emissivity of the ear canal.

13. The computer-implemented method of claim 11 or claim 12, further comprising receiving, from at least one microphone or a motion sensor, a cardiovascular signal, wherein identifying the health condition of the user is based on the temperature waveform and the cardiovascular signal.

14. The computer-implemented method of claim 11, claim 12 or claim 13, wherein receiving a temperature signal comprises one or more of: i. collecting, with an infrared detector and a filter, an infrared radiation in a pre-selected bandwidth from an ear canal of the user; ii. filtering an infrared radiation within a bandwidth based on a detection sensitivity over a bodily temperature range; iii. emitting an infrared radiation into an ear canal of the user and determining an emissivity and absorbance of a tissue in the ear canal within a pre-selected bandwidth to calibrate the temperature signal; vi. providing an infrared radiation to an in-ear canal and collecting a backscattered infrared radiation to calibrate an emissivity value and absorbance value for the in-ear canal into the temperature waveform; v. receiving a voltage value from a thermocouple electrode in contact with an in-ear canal of the user.

15. The computer-implemented method of any one of claims 11 to 14, wherein identifying a health condition of the user comprises one or more of: i. identifying a pattern in the temperature waveform indicative of a disease onset; ii. correlating the temperature waveform with cardio-respiratory vital signs of the user.