Patent Publication Number: US-2020280789-A1

Title: Sensor mount and circumaural headset or headphones with adjustable sensor

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to U.S. application Ser. No. 15/974,682 filed May 8, 2018, which is a continuation-in-part of U.S. application Ser. No. 15/697,630 filed Sep. 7, 2017, the disclosure of which is hereby incorporated in its entirety by reference herein. 
    
    
     TECHNICAL FIELD 
     This disclosure relates to circumaural headphones or earmuffs having an adjustable sensor mount for a biometric or physiological sensor. 
     BACKGROUND 
     Various types of sensors are being used to monitor personal physiological or biometric parameters related to health and/or performance during specified events or time periods, as well as during everyday activities. Monitoring of parameters such as heart rate, blood pressure, respiration rate, oxygen saturation, blood chemistry, blood flow, etc. under various environmental and use conditions presents numerous challenges in providing an acceptable sensor signal for processing. For example, motion artifacts generated by movement of the user and/or sensor during use may decrease accuracy of the resulting signal analysis results if not properly accommodated. Similarly, variation in positioning of the sensor relative to an expected placement, or movement during use may result in decreased accuracy. Changes in ambient conditions, such as variations in ambient light, sound, vibration, etc. may also contribute to noise in the sensor signal. 
     Biometric sensors have been integrated with earphones and headphones as the ear has been identified as being particularly amenable to photoplythysmography (PPG), or the optical volumetric measurement of blood flow, and similar optical measurements. Pulse oximetry sensors have been integrated into the cushion of circumaural headsets to measure blood oxygen saturation. Earphones, ear buds, headphones, and similar devices provide a convenient form factor that users are generally familiar with and comfortable with positioning of the devices. 
     SUMMARY 
     In one embodiment, a headset includes a band, first and second circumaural earcup assemblies connected to the band, each earcup assembly comprising an earcup and a cushion, and an adjustable sensor mount configured to be secured to at least one of the cushions. The headset may also include a sensor secured to the adjustable sensor mount, a speaker mounted in at least one of the earcups, a microphone, and a controller in communication with the sensor, the speaker, and the microphone. The controller may be programmed to control the microphone in response to signals from the sensor indicative of user jaw movement. The adjustable sensor mount may include a base configured for sliding engagement with the cushion and a sensor holder secured to the base and configured to receive the sensor. The sensor holder may be pivotably and/or slideably secured to the base. In various embodiments, the sensor holder comprises a support arm having a first end configured to translate in a first direction relative to the base, and a second end configured to receive a housing adapted to secure the sensor in the housing. The second end of the support arm may be configured to engage an inner support adapted to slide within the second end and provide translation of the housing in a direction generally orthogonal to translation of the first end relative to the base. 
     Embodiments may include a sensor mount with the second end of the support arm pivotally attached to the housing. An elastomeric cover may surround the housing to enhance comfort of the user. The adjustable sensor mount may be configured for sliding along the cushion. The sensor mount base may include a C-shaped base of a resilient plastic or metal adapted to secure the adjustable sensor mount to the cushion. 
     In one or more embodiments, the headset includes a controller programmed to generate a noise cancelling signal in response to signals from the microphone and to provide the noise cancelling signal to the speaker. 
     Embodiments also include an after-market or add-on accessory kit for a circumaural headset having a sensor mount configured to be secured to a circumaural cushion of a circumaural headset to position the sensor in contact with a user in front of tragus. The sensor may be installed and connected via a wired or wireless connection to a controller or circuit board of the headset. The sensor mount includes one or more positioning features as described with respect to various headset embodiments. 
     Various embodiments of a headset or muff having an adjustable sensor mount may include earcups with additional components for active noise reduction (ANR), passive hearing protection, audio, and/or voice communications using wired or wireless technology. ANR applications may include at least one earcup having a driver, error (sense) microphone, an optional voice/speech microphone and/or an optional ambient noise microphone coupled to one or more controllers to provide ANR and voice/speech functions. 
     The sensor may be mounted on an adjustable mount configured to move the sensor to a desired position on the user and maintain contact between the sensor and the user while delivering a comfortable fit wearing the headset. The controller may be programmed to analyze signals from the sensor. In one embodiment, the controller is programmed to detect jaw position and/or movement of the user in response to signals from the sensor. User jaw position and/or movement may be used to infer that a user is talking. The controller may provide a gating signal to a voice/speech microphone in response to detecting that the user is talking such that the voice/speech microphone signal is automatically muted or significantly attenuated when the user is not talking. User jaw position and/or movement as detected by the sensor may also be used to identify other user behavior, such as chewing or yawning, to distinguish from talking, or to provide a local or remote alert, for example. 
     Embodiments according to this disclosure may provide one or more advantages. For example, adjustable mounting of a sensor within or on a circumaural headset may allow the user to adjust the position of the sensor relative to the headset to improve signal to noise ratio and resulting accuracy and reliability of the sensor signal. The circumaural headset may provide isolation for the sensor to reduce the effect of environmental factors, such as ambient noise and light, on the sensor signals. Resilient mounting of a sensor may improve skin proximity or contact with the sensor during physical activity, while also improving comfort. Positioning of a biometric sensor in contact with the skin in front of the tragus over at least a portion of the TMJ provides a viable location for measurement of various biometric parameters, such as heartrate, oxygen saturation, blood flow, etc. Positioning of the sensor forward of the tragus within a designated target area using a circumaural headset/headphone provides limited location variability from person to person. An adjustable sensor mount according to various embodiments facilitates user adjustment and positioning of the sensor along one or more trajectories using one or more translation and/or rotation axes that may be centrally and/or eccentrically positioned relative to sensor movement. Detection of jaw movement using a sensor may be used to provide an automatic attenuation, muting, or gating function for a communication microphone associated with the headset, or to provide local or remote alerts based on inferred behavior associated with jaw position or movements. 
     The above advantages and other advantages and features will be readily apparent from the following detailed description of the preferred embodiments when taken in connection with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  illustrates a representative circumaural headset having an adjustable sensor mount according to one or more embodiments; 
         FIG. 2  illustrates ear anatomy with a target area forward of the tragus over at least a portion of the temporomandibular joint (TMJ) for positioning of a sensor of a circumaural headset according to one or more embodiments; 
         FIG. 3  is an assembly view of a representative earcup having a sensor eccentrically mounted on a spring-biased adjustment knob supported from an interior side surface of an earcup assembly according to one or more embodiments; 
         FIGS. 4A and 4B  illustrate an earcup assembly having a side-mounted support arm and base for an adjustable sensor without the cushion, and with the cushion installed, respectively, according to one or more embodiments; 
         FIGS. 5A and 5B  illustrate an earcup assembly having a flat-mounted support arm extending from a flat surface of the earcup assembly for an adjustable sensor without the cushion, and with the cushion installed, respectively, according to one or more embodiments; 
         FIGS. 6A-6C  illustrate an earcup assembly and a side-mounted adjustable support arm for a sensor according to one or more embodiments; 
         FIGS. 7A-7C  illustrate an earcup assembly and a flat-mounted adjustable support arm for a sensor according to one or more embodiments; 
         FIGS. 8A-8D  illustrate an earcup assembly and cushion having an adjustable sensor integrated with the cushion according to one or more embodiments; 
         FIG. 9  illustrates an earcup assembly having a rack-on-rack adjustment support for a sensor according to one or more embodiments; 
         FIGS. 10A and 10B  illustrate a sensor mount configured to engage the cushion of an earcup assembly according to one or more embodiments; 
         FIG. 11  is a block diagram illustrating operation of a representative control system for a circumaural headset having an adjustable sensor according to one or more embodiments; and 
         FIG. 12  is a flowchart illustrating operation of a system or method for controlling a circumaural headset having an adjustable sensor according to one or more embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     As required, detailed embodiments are disclosed herein; however, it is to be understood that the disclosed embodiments are merely representative and the claimed subject matter may be embodied in various and alternative forms not explicitly illustrated or described. The figures are not necessarily to scale; some features may be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the claimed subject matter. 
       FIG. 1  illustrates a representative circumaural headset having an adjustable biometric sensor mount according to one or more embodiments. Headset  100  includes a band  110  connecting first circumaural earcup assembly  112  and second circumaural earcup assembly  114 . Each earcup assembly  112 ,  114  includes an associated earcup  116 ,  120  and cushion  118 ,  122 . Each earcup  116 ,  120  includes a bottom portion  130  and a circumaural side portion  132 . Headset  100  may include a microphone  124 , which is implemented by a wired boom microphone in the representative embodiment illustrated. In other embodiments, headset  100  may communicate with an associated wireless microphone or with a wireless device having a microphone. When included, a microphone may be implemented with or without a boom, on a short boom, integrated into a wired connection, implemented by an optical comparator system, etc. Some embodiments do not include an associated microphone. 
     Headset  100  includes at least one sensor  126  secured to an adjustable sensor mount, which is secured to at least one of the first  112  and second  114  circumaural earcup assemblies. Various representative embodiments are described with reference to a biometric or physiological sensor. However, those of ordinary skill in the art will recognize that sensor  126  may be implemented by various types of sensors that may employ chemical, electrical, and/or optical technology to provide detection or measurement of various environmental conditions as well as user characteristics and/or movements. As such, the representative embodiments described and illustrated are not limited to biometric or physiologic sensors. Other examples of sensors may include acoustic sensors, accelerometers, and gyroscopes, for example. 
     As described in greater detail below, the adjustable sensor mount is configured to be movable in at least one direction or dimension to adjust a position of the sensor  126  relative to the earcup assembly  114  to position the sensor within a target region  210  ( FIG. 2 ) of the user, either in contact with the user or near contact, such as within 0-5 mm of the user, for example. In various embodiments, the target area or region  210  is generally forward of a tragus of the user as generally indicated in the ear anatomy of  FIG. 2 , and may extend above or below the tragus. In one or more embodiments, target region  210  extends between 5 mm-50 mm in front of the tip of the tragus, and within 25 mm above the helix to 25 mm below the ear lobe (or lobule of the ear). 
     For embodiments employing a biometric or physiologic sensor, sensor  126  may be implemented by any of a number of commercially available sensors that may be used to provide signals indicative of physiological parameters or characteristics of the user/wearer such as heart rate, blood pressure, respiration rate, oxygen saturation, blood chemistry, blood flow, etc. In one embodiment, signals from a biometric sensor  126  are used to detect jaw position and/or movement of the user that may indicate talking, chewing, yawning, etc. Jaw position signals may be used to provide a gating signal to provide an automatic muting function for microphone  124  that mutes microphone  124  except when the user is talking. In one or more implementations of a jaw position or movement sensor, biometric sensor  126  may be implemented by one or more accelerometers and/or gyroscopes, for example. 
       FIG. 2  illustrates ear anatomy with a target area  210  forward of the tragus over at least a portion of the temporomandibular joint (TMJ) for positioning of a biometric sensor  126  of a circumaural headset according to one or more embodiments. As used throughout this description, an adjustable sensor mount provides movement of the sensor relative to the earcup assembly in at least one direction. In some embodiments, movement may be provided in non-orthogonal directions, or along one or more of an x-axis, y-axis, and z-axis direction where the x-axis is defined by moving forward in the direction of the face or rearward in the direction of the back of the head (horizontally), the y-axis is defined by moving in the direction of the top of the head (upward) or the neck (vertically, downward), and the z-axis is defined by moving toward the head or away from the head. Similarly, depending on the particular application and implementation, biometric sensor  126  may be mounted to move along a two-dimensional or three-dimensional trajectory according the degrees of freedom of the particular mounting mechanism or device. For example, combination movements incorporating rotation and translation about one or more axes symmetrically or asymmetrically (or eccentrically) positioned axes may be used to provide three-dimensional movement of the biometric sensor  126 , such as toward the head while moving upward and forward, or away from the head while moving forward and downward. Numerous other movement trajectories are possible. 
       FIG. 3  is an assembly view of a representative earcup  316  having a biometric sensor  326  eccentrically mounted on a spring-biased adjustment knob or cap  350  supported from an interior side surface  332  of the earcup  316  according to one or more embodiments. As used throughout this description, references to a spring, spring-biased, or resilient component or device are meant to be broadly construed and refers generally to an elastic component or device that recovers its original shape when released after being distorted. A sensor mount supported from a side surface of the earcup assembly may provide various advantages including improved repeatability and reliability of sensor placement and position/contact relative to the user, as well as providing user comfort along the z-axis. Sensor (or support) arm  360  extends from an interior side surface  332  and supports base  362 . Interior side surface  332  may be an interior side surface of the earcup  316  or another component within the earcup assembly generally orthogonal to the head of the user. Alternatively, support arm  360  may extend from a flat surface  330  of the earcup  316  or the earcup assembly that is generally parallel to the head of the user. For example, support arm  360  may extend from a speaker plate secured to the earcup as illustrated in  FIG. 7 . 
     Support arm  360  and base  362  may be integrally formed or molded with earcup  316  in some embodiments. Support arm  360  may be flexible or resilient to urge biometric sensor  326  into contact with the headset user. In one embodiment, support arm  360  may be repositionable around the circumference of the earcup, or at least a portion of the circumference of the earcup. Alternatively, or in combination, a spring  364  may be disposed within or around base  362  with cap  350  rotatably secured to base  362  over spring  364  and moveable against a spring force of spring  364  toward base  362 . Cap  350  includes an eccentrically located aperture  370  configured to receive and secure biometric sensor  326 . In the representative embodiment illustrated, biometric sensor  326  is implemented by a wired sensor with wires  372  communicating with a controller ( FIG. 8 ). Wired sensors may be configured for permanent or removeable connection to a controller or circuit board by a plug, ribbon cable connector, soldering, etc. depending on the particular application. Various embodiments may be configured adapted to receive an add-on biometric sensor  326  that may be installed on a headset and connected to a controller as described in greater detail herein. Biometric sensor  326  may also be implemented by a wireless sensor depending on the particular application. For applications having a wired biometric sensor  326 , cap  350  and base  362  may include complementary grooves with stops to limit rotation of cap  350  to less than 360 degrees to reduce twisting of wires  372 . 
     In some embodiments, cap  350  and base  362  may include complementary threads or grooves to move or adjust sensor  326  along the z-axis with resistance provided by spring  364  to maintain a particular rotational position. In these embodiments, biometric sensor  326  may be centrally located within cap  350 . In other embodiments, a slot or groove in base  362  may cooperate with a corresponding or complementary protrusion within cap  350  to secure cap  350  to base  362  and limit movement along the z-axis. Spring  364  resiliently biases cap  350  to extend from base  362  along the z-axis into contact with the headset user. In these embodiments, rotation of the cap  350  and eccentrically mounted sensor  326  may be used to better locate or position the sensor in the x-axis and y-axis directions with respect to the target area or region forward of the tragus of the user generally over a portion of the TMJ. 
       FIGS. 4A and 4B  illustrate an earcup  416  having a side-mounted support arm  460  and base for an adjustable biometric sensor  426  without the cushion  418 , and with the cushion  418  installed, respectively, according to one or more embodiments. As previously described, sensor  426  may be eccentrically mounted on a rotatable cap  450  secured to a base (not shown) supported by support arm  460 , which extends from an interior side surface  442  of earcup  416 . As shown in  FIG. 4B , support arm  460  positions sensor  426  within the opening  480  of cushion  418 . In other embodiments, sensor  426  may at least partially overlap a side portion of cushion  418 . Support arm  460  may be mounted to slide along an interior guide or rail within earcup  416  in some embodiments. 
       FIGS. 5A and 5B  illustrate an earcup  516  having a flat-mounted support arm  560  extending from a flat surface  530  of the earcup assembly for an adjustable biometric sensor without the cushion  518 , and with the cushion  518  installed, respectively, according to one or more embodiments. As previously described, flat surface  530  may be a flat surface of the earcup or a component mounted within the earcup, such as a speaker plate or similar component, for example. In some embodiments, support arm  560  is moveable around at least a portion of the interior of earcup  516 . Support arm  560  is configured to position biometric sensor  526  within opening  580  of circumaural cushion  518 . 
       FIGS. 6A-6C  illustrate an earcup  616  and a side-mounted adjustable support arm  660  for a biometric sensor  626  according to one or more embodiments.  FIG. 6A  illustrates positioning of biometric sensor  626  within an opening in cushion  618 . As shown in  FIGS. 6B and 6C , biometric sensor  626  is mounted on a spring arm  660 , which is secured by a lateral support  670 . In some embodiments, lateral support  670  may be movable around the interior of earcup  616  to position biometric sensor  626  in the x-axis and y-axis directions. Movement of biometric sensor  626  in the z-axis direction is provided by spring arm  660 . 
       FIGS. 7A-7C  illustrate an earcup  716  and a flat-mounted adjustable support arm  760  for a biometric sensor  726  according to one or more embodiments. Support arm  760  is mounted on a flat surface  730  of earcup  716  or another component mounted within the earcup assembly. Flat surface  730  may be a bottom surface of earcup  716 , or a speaker plate, for example. Flat surface  730  may be generally parallel to the user&#39;s head, or alternatively at an angle, such as less than 45 degrees relative to parallel. Support arm  760  may be made of a resilient material to provide a spring force that urges biometric sensor  726  into contact with the user when the headset is worn. As described with respect to other embodiments, and generally applicable to all embodiments, any adjustments that facilitate positioning of the sensor within the target region in contact with the user may also provide positioning within the target region in near contact with the user, such as within 0-5 mm, for example. Similar to the side-mounted embodiments illustrated in  FIGS. 6A-6C , some embodiments of a flat-mounted adjustable support arm have the support arm  760  movable around at least a portion of flat surface  730  to provide adjustments in the x-axis and y-axis directions. Movement of biometric sensor  726  in the z-axis direction may be provided by the resilient support arm  760 . 
       FIGS. 8A-8D  illustrate an earcup  816  and cushion  818  having an adjustable biometric sensor  826  integrated with the cushion  818  according to one or more embodiments.  FIG. 8A  also illustrates representative placement of a speaker/driver  876 . As shown in the underside view of  FIG. 8B , a support arm  860  extends from a side of the cushion seal and supports a base  862 . In this embodiment, base  826  extends through cushion  818  rather than being positioned within circumaural opening  880 . Electrical contacts  878  may be provided to connect biometric sensor  826  to a controller ( FIG. 11 ). As shown in  FIG. 8C , the adjustable sensor mount may include an integrally molded spring  864  implemented by first and second serpentine springs in this example. Spring  864  may be implemented as a coil spring or in any other manner depending on the particular application. Biometric sensor  826  extends through cushion  818  and may be generally flush with the cushion surface or extend slightly beyond the cushion surface when the cushion is not compressed. 
       FIG. 9  illustrates an earcup assembly  900  having a rack-on-rack adjustment support  910  for a biometric sensor according to one or more embodiments. Rack-on-rack adjustment support  910  includes an arcuate rack  976  mounted within earcup  916  generally behind or below a front surface of cushion  918 . A transverse rack  978  engages arcuate rack  976  and is slidable relative thereto. Arcuate rack  976  may include teeth or similar detents that allow transverse rack  978  to move or slide along arcuate rack with sufficient force, while holding transverse rack  978  in a selected position when sufficient force is not applied. Transverse rack  978  may also include teeth on a top surface to engage the base of the sensor mount (best illustrated in  FIGS. 3-5 ) allowing the base to slide along transverse rack  978  in a similar fashion. 
     Another embodiment of a biometric sensor mount for a circumaural headset is illustrated in  FIGS. 10A and 10B . Earcup assembly  1000  includes a sensor mount  1010  configured to attached to cushion  1018 , which is secured to earcup  1016 . Sensor mount  1010  includes a strap or base  1050  that may be constructed of a resilient material, such as a resilient plastic or metal, to securely position a strap or base  1050  relative to cushion  1018 . Alternatively, strap or base  1050  may be constructed of a flexible or deformable material that may be bent by the user to secure the base  1050  to the cushion  1018  at a desired position. Base  1050  may be configured as a generally U-shaped or C-shaped device extending across the surface of cushion  1018  and at least partially around a back side of cushion  1018  to secure sensor mount  1010  thereto. In various embodiments, base  1050  is configured to slide relative to cushion  1018  so that a sensor (not shown) secured to sensor holder  1058  may be appropriately positioned in front of the tragus of the user. 
     Base  1050  may include integrated extension portions  1052 ,  1054  defining a slot or aperture  1056  therebetween. Sensor mount  1010  may include an arm  1060  that may cooperate with at least one of the extensions  1052 ,  1054  to facilitate sliding or translating of sensor holder  1058  along at least a portion of base  1050  in a direction generally transverse to sliding movement of base  1050  along cushion  1018 . In various embodiments, arm  1060  may cooperate with both extensions  1052 ,  1054  as indicated at  1062 . Arm  1060  may include a first pivot  1070  to facilitate rotational movement of arm  1060  relative to base  1050 . Similarly, arm  1060  may include an inner support  1072  that may slide or translate within a corresponding outer support of arm  1060  so that sensor holder  1058  can translate relative to arm  1060 . Inner support  1072  may include an associated pivot attachment  1074  to secure sensor holder  1058  to inner support  1072  and allow rotational movement of sensor holder  1058 . 
     Sensor holder  1058  may include a rigid housing made of plastic or metal, for example defining an opening  1078 . An elastomeric cover  1080  may surround the housing to improve user comfort while maintaining an associated biometric sensor (not shown) positioned within opening  1078  in contact with a user generally forward of the tragus of the user. The resiliency of the cushion  1018  may be used to keep any installed sensor in contact with, or in close proximity to, the user. When installed, the sensor (not shown) may be connected to an associated controller or processor by a wired or wireless connection as generally described herein. 
     Various embodiments may include an after-market or add-on accessory kit for a circumaural headset having a sensor mount  1010  including one or more of the positioning features described with respect to  FIGS. 10A and 10B . A sensor may be installed within sensor holder  1058  and connected to an existing headset via a plug, ribbon cable, etc. connected to a corresponding circuit board or similar interface. Alternatively, the sensor may be coupled to a headset processor or controller via a wireless connection using BLUETOOTH, BLE, or similar technology. As previously described, sensor mount  1010  may secure various types of sensors including, but not limited to, biometric or physiologic sensors, accelerometers, gyroscopes, etc. that may use electrical and/or optical technology, for example. 
       FIG. 11  is a block diagram illustrating operation of a representative control system for a circumaural headset having an adjustable biometric sensor according to one or more embodiments. System  1100  includes a controller  1110 , which may include a processor  1112 . As those of ordinary skill in the art will recognize, a controller  1110  may refer to software and/or hardware that cooperate to provide control of the system. Controller  1110  and/or processor  1112  may be implemented by general purpose or special purpose processors, chips, or microcontrollers, that may include one or more programmable circuits, elements, microprocessors, etc., such as digital signal processors (DSPs), FPGAs, and ASICs, for example. Controller  1110  communicates with biometric sensor  1114 , speaker/driver  1116 , and microphone  1118  via wired and/or wireless communication. Controller  1110  may be programmed to perform various functions, features, or algorithms as generally described herein and as represented by flow charts or similar diagrams such as shown in  FIG. 12 . 
       FIG. 12  is a flowchart  1200  illustrating operation of a system or method for controlling a circumaural headset having an adjustable biometric sensor according to one or more embodiments. The flowchart provides representative control strategies and/or logic that may be implemented using one or more processing strategies such as event-driven, interrupt-driven, multi-tasking, multi-threading, and the like. Various control strategies including, but not limited to, open-loop, closed-loop, adaptive, feedback, feedforward, and hybrid strategies may be implemented by control logic, functions, or software executed by controller  1110  to provide active noise reduction, processing of sensor signals to monitor conditions and/or movements of the user, environmental or ambient conditions, and/or processing or analysis of sensor signals to provide an alert or control signal to a local or remote device, such as a microphone or speaker, in various embodiments. Alternatively, sensor data may be transmitted for storage and/or processing at a remote computer, server, or cloud device, for example. 
     Various steps or functions illustrated may be performed in the sequence illustrated, in parallel, or in some cases omitted. Although not always explicitly illustrated, one of ordinary skill in the art will recognize that one or more of the illustrated steps or functions may be repeatedly performed depending upon the particular processing strategy being used. Similarly, the order of processing is not necessarily required to achieve the features and advantages described herein, but is provided for ease of illustration and description. The control logic may be implemented primarily in software executed by a microprocessor-based controller represented by controller  1110  and microprocessor  1112 . Of course, the control logic may be implemented in software, hardware, or a combination of software and hardware in one or more controllers depending upon the particular application. When implemented in software, the control logic may be provided in one or more computer-readable storage devices or media having stored data representing code or instructions executed by a processor to perform the described function or feature. The computer-readable storage devices or media may include one or more of a number of known physical devices which utilize electric, magnetic, and/or optical storage to keep executable instructions and associated information, operating variables, and the like. 
     Block  1210  represents processing of signals received from a biometric sensor. Signals may be received by a wire connecting the sensor to the processor, or via wireless communication. Signal processing may be performed to monitor one or more physiological parameters of the headset user, which may be stored in a computer readable storage associated with the controller. Sensor signals from the biometric sensor may also be processed and analyzed to detect user jaw position and/or movement and infer an associated user behavior based on the signals as represented at block  1220 . For example, jaw position or movement may be analyzed to infer that a user is talking as represented at block  1222 , yawning as represented at block  1224 , or eating as represented at block  1226 . 
     A signal may be generated in response to detected user behavior and transmitted locally or remotely as represented at block  1230 . The signal may be used to control an associated microphone or speaker as represented at block  1232 . In one embodiment, biometric sensor signals are processed to detect user jaw position and/or motion indicative of talking with the resulting signal used to provide a gating signal or automatic muting feature for an associated microphone. This is particularly advantageous in noisy environments where automatic muting based on ambient noise levels may lead to spurious unmuting of the microphone. In some embodiments, the signal may be used as a gating signal internally within the controller or processor. 
     In some embodiments, one or more microphones may be used to monitor ambient noise to provide active noise reduction (ANR). In these embodiments, a microphone signal is processed as represented at block  1240  to generate an anti-noise signal out of phase with the noise, and apply the anti-noise signal to an associated speaker/driver as represented at block  1250 . 
     As apparent from the representative embodiments illustrated, the x-axis and y-axis adjustments can be made by a user adjusting the location of the sensor along a predefined area, either via an adjustable arm that can move along the x-axis, y-axis, along a rack or rail in the x-y plane, or in an eccentric pattern to provide vertical and horizontal or rotational adjustments. The movement along the axes may involve the entire sensor assembly along the side or flat surface of the earcup. Alternatively, or in combination, the movement may involve parts of the assembly, such as the sensor mount, along a track or adjustable surface. For embodiments having the sensor integrated within the cushion, the x-axis and y-axis adjustment is primarily accomplished by adjustment of the headset on the user&#39;s head to locate the sensor appropriately. Alternatively, different foam inserts may be provided each having different sensor placement within the cushion to customize the placement for a particular user. 
     The z-axis adjustment is limited in user interaction and can be provided by a spring, flexible arm, or foam pieces used individually or in combination to optimize skin contact, sensor readings, and comfort. The z-axis adjustments account for the ergonomics of the range of heads and the compressibility of the cushion to allow for a proper range of adjustments to be made to optimize skin contact, sensor readings, and comfort. 
     As demonstrated by the representative embodiments illustrated and describe in this disclosure, one or more advantages may be provided. For example, adjustable mounting of a biometric sensor within a circumaural headset may allow the user to adjust the position of the sensor relative to the headset to improve signal to noise ratio (SNR) and resulting accuracy and reliability of the sensor signal. The circumaural headset may provide isolation for the biometric sensor to reduce the effect of environmental factors, such as ambient noise and light, on the sensor signals. Resilient mounting of a biometric sensor may improve skin contact with the sensor during physical activity, while also improving comfort. Positioning of a biometric sensor in contact with the skin in front of the tragus over at least a portion of the TMJ provides a viable location for measurement of various biometric parameters, such as heartrate, oxygen saturation, blood flow, etc. In addition, positioning of the sensor forward of the tragus using a circumaural headset/headphone provides limited location variability from person to person. An adjustable biometric sensor mount according to various embodiments facilitates user adjustment and positioning of the sensor in two dimension for proper placement with a third-dimension adjustment for comfort and proper skin contact. Detection of jaw movement using a biometric sensor may be used to provide an automatic muting or gating function for a communication microphone associated with the headset, or to provide local or remote alerts based on inferred behavior associated with jaw position or movements. 
     While representative embodiments are described above, it is not intended that these embodiments describe all possible forms of the claimed subject matter. The words used in the specification are words of description rather than limitation, and it is understood that various changes may be made without departing from the spirit and scope of the disclosure. Additionally, the features of various implementing embodiments may be combined to form further embodiments that may not be illustrated or described in combination. While the best mode has been described in detail, those familiar with the art will recognize various alternative designs and embodiments within the scope of the following claims. While various embodiments may have been described as providing advantages or being preferred over other embodiments with respect to one or more desired characteristics, those of ordinary skill in the art will recognize that one or more characteristics may be compromised to achieve desired system attributes, which depend on the specific application and implementation. These attributes include, but are not limited to: cost, strength, durability, life cycle cost, marketability, appearance, packaging, size, serviceability, weight, manufacturability, ease of assembly, etc. Any embodiments described as less desirable than other embodiments or prior art implementations with respect to one or more characteristics are not outside the scope of the disclosure and may be desirable for particular applications.