Patent Publication Number: US-2023133951-A1

Title: Directed audio for enclosed environments

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of priority to U.S. Provisional Patent Application No. 63/274,504, entitled, “Directed Audio for Enclosed Environments”, filed on Nov. 1, 2021, the disclosure of which is hereby incorporated herein in its entirety. 
    
    
     TECHNICAL FIELD 
     The present description relates generally to acoustic environments, including, for example, directed audio for enclosed environments. 
     BACKGROUND 
     Acoustic devices can include speakers that generate sound and microphones that detect sound. Acoustic devices are often deployed in enclosed environments, such as conference rooms, to provide audio output to a population of occupants in the enclosed environment. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Certain features of the subject technology are set forth in the appended claims. However, for purpose of explanation, several embodiments of the subject technology are set forth in the following figures. 
         FIGS.  1  and  2    illustrate aspects of an example apparatus in accordance with one or more implementations. 
         FIGS.  3  and  4    illustrate side perspective views of example dual-directional acoustic devices in accordance with implementations of the subject technology. 
         FIG.  5    illustrates a perspective view of an example apparatus having an enclosed space and incorporating a dual-directional acoustic device in accordance with implementations of the subject technology. 
         FIG.  6    illustrates a perspective view of an example apparatus having an enclosed space and incorporating a ringed speaker array in accordance with implementations of the subject technology. 
         FIG.  7    illustrates an example beamforming speaker array in accordance with implementations of the subject technology. 
         FIG.  8    illustrates an example beamforming speaker array having a directional feature in accordance with implementations of the subject technology. 
         FIG.  9    illustrates a top view of an example apparatus having an enclosed space and incorporating an isobaric speaker in accordance with implementations of the subject technology. 
         FIG.  10    illustrates an example isobaric speaker in accordance with implementations of the subject technology. 
         FIGS.  11  and  12    illustrates two respective operational modes of the example isobaric speaker of  FIG.  10    in accordance with implementations of the subject technology. 
         FIG.  13    illustrates a top view of an example apparatus having an enclosed space and incorporating a door-mounted speaker array in accordance with implementations of the subject technology. 
     
    
    
     DETAILED DESCRIPTION 
     The detailed description set forth below is intended as a description of various configurations of the subject technology and is not intended to represent the only configurations in which the subject technology can be practiced. The appended drawings are incorporated herein and constitute a part of the detailed description. The detailed description includes specific details for the purpose of providing a thorough understanding of the subject technology. However, the subject technology is not limited to the specific details set forth herein and can be practiced using one or more other implementations. In one or more implementations, structures and components are shown in block diagram form in order to avoid obscuring the concepts of the subject technology. 
     Implementations of the subject technology described herein provide directed audio for enclosed environments. In one or more implementations, an apparatus may include an enclosed environment, and one or more dual-directional speakers, one or more ringed arrays of speakers, one or more isobaric cross-firing speakers, and/or one or more door-mounted speaker arrays, any or all of which may direct sound to one or more desired locations within the enclosed environment. 
     An illustrative apparatus including one or more speakers for directed audio is shown in  FIG.  1   . In the example of  FIG.  1   , an apparatus  100  includes an enclosure  108  and a structural support member  104 . The enclosure may (e.g., at least partially) define an enclosed environment  131 . In the example of  FIG.  1   , the enclosure  108  includes top housing structures  138  mounted to and extending from opposing sides of the structural support member  104 , and a sidewall housing structure  140  extending from each top housing structure  138 . 
     In this example, the enclosure  108  is depicted as a rectangular enclosure in which the sidewall housing structures  140  are attached at an angle to a corresponding top housing structure  138 . However, it is also appreciated that this arrangement is merely illustrative, and other arrangements are contemplated. For example, in one or more implementations, the top housing structure  138  and the sidewall housing structure  140  on one side of the structural support member  104  may be formed from a single (e.g., monolithic) structure having a bend or a curve between a top portion (e.g., corresponding to a top housing structure  138 ) and a side portion (e.g., corresponding to a sidewall housing structure  140 ). For example, in one or more implementations, the top housing structure  138  and the sidewall housing structure  140  on each side of the structural support member  104  may be formed from a curved glass structure. In this and/or other implementations, the sidewall housing structure  140  and/or other portions of the enclosure  108  may be or include a reflective surface (e.g., an acoustically reflective surface). 
     As illustrated in  FIG.  1   , the apparatus  100  may include various components such as one or more safety components  116 , one or more speakers  118 , and/or one or more other components  132 . In the example of  FIG.  1   , the safety component  116 , the speaker  118 , and the other component  132  are mounted in a structural space  130  at least partially within the structural support member  104 . The other component  132  may include, as examples, one or more cameras, and/or one or more sensors. However, it is also contemplated that one or more safety components  116 , one or more speakers  118 , and/or one or more other components  132  may also, and/or alternatively, be mounted to the enclosure  108 , and/or to and/or within one or more other structures of the apparatus  100 . As shown in  FIG.  1   , the structural support member  104  may include a first side  134 , an opposing second side  135 , and a bottom surface  136  that faces an interior of the enclosed environment  131  defined by the enclosure  108 . 
     In various implementations, the apparatus  100  may be implemented as a stationary apparatus (e.g., a conference room or other room within a building) or a moveable apparatus (e.g., a vehicle such as an autonomous or semiautonomous vehicle, a train car, an airplane, a boat, a ship, a helicopter, etc.) that can be temporarily occupied by one or more human occupants. In one or more implementations, (although not shown in  FIG.  1   ), the apparatus  100  may include one or more seats for one or more occupants. In one or more implementations, one or more of the seats may be mounted facing in the same direction as one or more other seats, and/or in a different (e.g., opposite) direction of one or more other seats. 
     In one or more implementations, the apparatus  100  may be implemented as a moveable platform such as a vehicle (e.g., an autonomous vehicle that navigates roadways using sensors and/or cameras and substantially without control by a human operator, a semiautonomous that includes human operator controls and that navigates roadways using sensors and/or cameras with the supervision of a human operator, or a vehicle with the capability of switching between a fully autonomous driving mode, a semiautonomous driving mode, and/or a human controlled mode). 
     In one or more use cases, it may be desirable to provide audio content to one or more occupants within the enclosed environment  131 . The audio content may include general audio content intended for all of the occupants and/or personalized audio content for one or a subset of the occupants. For example, in implementations in which the apparatus  100  is a moveable apparatus, it may be desirable to notify a particular occupant that their stop is upcoming or that the apparatus  100  has arrived at their stop, without conveying that notification to other occupants within the enclosed space. In these and/or other use cases, it may be desirable to be able to direct the audio content, or a portion of the audio content, to one or more particular locations within the enclosed environment  131  and/or to suppress the audio content and/or a portion of the audio content at one or more other particular locations within the enclosed environment  131 . In various examples, the speaker  118  may be implemented as a dual-directional speaker, a speaker of a ringed array of speakers, an isobaric cross-firing speaker, or a speaker of a door-mounted speaker array, as discussed in further detail hereinafter in connection with  FIGS.  3 - 13   . 
     In various implementations, the apparatus  100  may include one or more other structure, mechanical, electronical, and/or computing components that are not shown in  FIG.  1   . For example,  FIG.  2    illustrates a schematic diagram of the apparatus  100  in accordance with one or more implementations. 
     As shown in  FIG.  2   , the apparatus  100  may include structural and/or mechanical components  101  and electronic components  102 . In this example, the structural and/or mechanical components  101  include the enclosure  108 , the structural support member  104 , and the safety component  116  of  FIG.  6   . In this example, the structural and/or mechanical components  101  also include a platform  142 , propulsion components  106 , and support features  117 . In this example, the enclosure  108  includes a reflective surface  112  and an access feature  114 . 
     As examples, the safety components  116  may include one or more seatbelts, one or more airbags, a roll cage, one or more fire-suppression components, one or more reinforcement structures, or the like. As examples, the platform  142  may include a floor, a portion of the ground, or a chassis of a vehicle. As examples, the propulsion components may include one or more drive system components such as an engine, a motor, and/or one or more coupled wheels, gearboxes, transmissions, or the like. The propulsion components may also include one or more power sources such as fuel tank and/or a battery. As examples, the support feature  117  may be support features for occupants within the enclosed environment  131  of  FIG.  1   , such as one or more seats, benches, and/or one or more other features for supporting and/or interfacing with one or more occupants. As examples, the reflective surface  112  may be a portion of a top housing structure  138  or a sidewall housing structure  140  of  FIG.  1   , such as a glass structure (e.g., a curved glass structure). As examples, the access feature  114  may be a door or other feature for selectively allowing occupants to enter and/or exit the enclosed environment  131  of  FIG.  1   . 
     As illustrated in  FIG.  2   , the electronic components  102  may include various components, such as a processor  190 , RF circuitry  103  (e.g., WiFi, Bluetooth, near field communications (NFC) or other RF communications circuitry), memory  107 , a camera  111  (e.g., an optical wavelength camera and/or an infrared camera, which may be implemented in the other components  132  of  FIG.  1   ), sensors  113  (e.g., an inertial sensor, such as one or more accelerometers, one or more gyroscopes, and/or one or more magnetometers, radar sensors, ranging sensor such as LIDAR sensors, depth sensors, temperature sensors, humidity sensors, etc. which may also be implemented in the other components  132  of  FIG.  1   ), a microphone  119 , a speaker  118 , a display  110 , and a touch-sensitive surface  122 . These components optionally communicate over a communication bus  150 . Although a single processor  190 , RF circuitry  103 , memory  107 , camera  111 , sensor  113 , microphone  119 , speaker  118 , display  110 , and touch-sensitive surface  122  are shown in  FIG.  2   , it is appreciated that the electronic components  102  may include one, two, three, or generally any number of processors  190 , RF circuitry  103 , memories  107 , cameras  111 , sensors  113 , microphones  119 , speakers  118 , displays  110 , and/or touch-sensitive surfaces  122 . 
     In the example of  FIG.  2   , apparatus  100  includes a processor  190  and memory  107 . Processor  190  may include one or more general processors, one or more graphics processors, and/or one or more digital signal processors. In some examples, memory  107  may include one or more non-transitory computer-readable storage mediums (e.g., flash memory, random access memory, volatile memory, non-volatile memory, etc.) that store computer-readable instructions configured to be executed by processor  190  to perform the techniques described below. 
     RF circuitry  103  optionally includes circuitry for communicating with electronic devices, networks, such as the Internet, intranets, and/or a wireless network, such as cellular networks and wireless local area networks (LANs). RF circuitry  103  optionally includes circuitry for communicating using near-field communication and/or short-range communication, such as Bluetooth®. 
     Display  110  may incorporate LEDs, OLEDs, a digital light projector, a laser scanning light source, liquid crystal on silicon, or any combination of these technologies. Examples of display  110  include head up displays, automotive windshields with the ability to display graphics, windows with the ability to display graphics, lenses with the ability to display graphics, tablets, smartphones, and desktop or laptop computers. In one or more implementations, display  110  may be operable in combination with the speaker  118  and/or with a separate display (e.g., a display of a smartphone, a tablet device, a laptop computer, a smart watch, or other device) of a separate device within the enclosed environment  131 . 
     Touch-sensitive surface  122  may be configured for receiving user inputs, such as tap inputs and swipe inputs. In some examples, display  110  and touch-sensitive surface  122  form a touch-sensitive display. 
     Camera  111  optionally includes one or more visible light image sensors, such as charged coupled device (CCD) sensors, and/or complementary metal-oxide-semiconductor (CMOS) sensors operable to obtain images within the enclosed environment  131  and/or of an environment external to the enclosure  108 . Camera  111  may also optionally include one or more infrared (IR) sensor(s), such as a passive IR sensor or an active IR sensor, for detecting infrared light from within the enclosed environment  131  and/or of an environment external to the enclosure  108 . For example, an active IR sensor includes an IR emitter, for emitting infrared light. Camera  111  also optionally includes one or more event camera(s) configured to capture movement of objects such as occupants within the enclosed environment  131  and/or objects such as vehicles, roadside objects and/or pedestrians outside the enclosure  108 . Camera  111  also optionally includes one or more depth sensor(s) configured to detect the distance of physical elements from the enclosure  108  and/or from other objects within the enclosed environment  131 . In some examples, camera  111  includes CCD sensors, event cameras, and depth sensors that are operable in combination to detect the physical setting around apparatus  100 . 
     In some examples, sensors  113  may include radar sensor(s) configured to emit radar signals, and to receive and detect reflections of the emitted radar signals from one or more objects in the environment around the enclosure  108 . In some examples, one or more microphones such as microphone  119  may be provided to detect sound from an occupant within the enclosed environment  131  and/or from one or more audio sources external to the enclosure  108 . In some examples, microphone  119  includes an array of microphones that optionally operate in tandem, such as to identify ambient noise or to locate the source of sound in space. 
     Sensors  113  may also include positioning sensors for detecting a location of the apparatus  100 , and/or inertial sensors for detecting an orientation and/or movement of apparatus  100 . For example, processor  190  of the apparatus  100  may use inertial sensors and/or positioning sensors (e.g., satellite-based positioning components) to track changes in the position and/or orientation of apparatus  100 , such as with respect to physical elements in the physical environment around the apparatus  100 . Inertial sensor(s) of sensors  113  may include one or more gyroscopes, one or more magnetometers, and/or one or more accelerometers. 
     As discussed herein, speaker  118  may be implemented as a dual-directional speaker, a speaker of a ringed array of speakers, an isobaric cross-firing speaker, or a speaker of a door-mounted speaker array, in various implementations.  FIG.  3 - 5    illustrate examples in which the speaker  118  is implemented as a dual-directional speaker.  FIG.  6 - 8    illustrate examples in which the speaker  118  is implemented as a speaker of a ringed array of speakers.  FIGS.  9 - 12    illustrate examples in which the speaker  118  is implemented as an isobaric cross-firing speaker.  FIG.  13    illustrates an example in which the speaker  118  is implemented as a speaker of a door-mounted speaker array. 
       FIG.  3    illustrates a perspective view of an example dual-directional speaker, in accordance with one or more implementations. As shown in  FIG.  3   , a dual directional speaker may include a sound-generating element  300  mounted between a pair of acoustic ducts (e.g., acoustic duct  313  and acoustic duct  314 ). In the example of  FIG.  3   , the pair of acoustic ducts  313  and  314  of the speaker  118  have a common longitudinal axis. In this arrangement the acoustic duct  313  and the acoustic duct  314  are formed by respective elongated channels in a common channel housing  310 , and each have a corresponding slot  312  in the common channel housing  310 . 
     In the example of  FIG.  3   , the sound-generating element  300  is mounted within the channel housing  310  between the acoustic duct  313  and the acoustic duct  314 . In other implementations, the sound-generating element  300  may be mounted to the channel housing  310  so as to project sound into an aperture at the center of the channel housing  310  that can then propagate down each of the acoustic ducts. The sound-generating element  300  may include speaker components such a moveable diaphragm that can be actuated (e.g., via attachment to a voice coil or a magnet that move relative to each other responsive to a current in the voice coil, or any other speaker driver mechanism). In any of these various implementations, the sound-generating element  300  generates sound that is projected through the acoustic duct  313  to an opening  311 , and through the acoustic duct  314  to an opening  315 . The acoustic duct  313  and the acoustic duct  314  may each be fluidly coupled to (e.g., and form a part of) a front volume of the sound-generating element  300 , and the sound-generating element  300  may also include a back volume that is acoustically and/or fluidly separate from the front volume, the acoustic duct  313 , and the acoustic duct  314 . 
     As shown in the example of  FIG.  3   , the acoustic duct  313  and the acoustic duct  314  each include a slot  312  that fluidly couples the respective acoustic duct with the external environment at a location between the sound-generating element  300  and the respective openings  311  and  312 . Although a single slot  312  is visible in the example of  FIG.  3    for each acoustic duct, the channel housing  310  may include multiple slots  312  (e.g., two slots  312  symmetrically disposed on opposing sides of the channel housing, three slots  312 , or more than three slots  312 ) for each acoustic duct. 
     In the example of  FIG.  3   , the slot  312  extends along the length of the channel housing  310  in parallel with a longitudinal axis of the channel housing  310  and the acoustic ducts  313  and  314  defined therein.  FIG.  4    illustrates another example of the channel housing  310  in which multiple slots  400  are instead provided in the channel housing  310 . In the example of  FIG.  4   , the slots  400  are oriented transversely to the longitudinal axis of the channel housing  310  and are spaced apart along the length of the channel housing  310  in a direction parallel with the longitudinal axis of the channel housing  310  and the acoustic ducts  313  and  314  defined therein. 
     In the examples of  FIGS.  3  and  4   , the slot  312  in each of the acoustic ducts  313  and  314  has a uniform slot width along the respective acoustic duct, and the slots  400  are uniformly shaped and uniformly spaced along the acoustic ducts  313  and  314 . For example, a uniform slot width may be implemented to form as narrow a projected beam as possible at all frequencies. In these uniform slot-width implementations, the projected beam becomes monotonically narrower as frequency increases. However, it is also appreciated that the width of a longitudinal slot such as the slot  312  may change along the length of the acoustic duct  313  and/or the acoustic duct  314 , and/or the slots  400  may have transverse slot lengths and/or longitudinal slot widths that change (e.g., from one slot  400  to a next slot  400 ) along the length of the acoustic duct  313  and/or the acoustic duct  314 . For example, an expanding slot width (e.g., expanding along the length of an acoustic duct in a direction away from the sound-generating element  300 ) can be implemented to generate a projected beam that settles at a particular width, such that the directivity of the projected beam is more constant with frequency. 
     For example, in one or more implementations, one or more longitudinal slots, such as one or more of the slots  312  of  FIG.  3   , may be implemented as an expanding slot having a slot width that is relatively narrow at a proximal slot end nearer to the sound-generating element  300  and expands in a direction parallel to the longitudinal axis of the channel housing  310  (e.g., and the acoustic duct  313  and/or the acoustic duct  314  defined therein) toward a distal slot end further from the sound-generating element  300 . In one or more implementations, the slot width can increase uniformly away from the sound-generating element  300  along the length of the channel housing  310  (e.g., at a constant expansion angle of between thirty degrees and sixty degrees, or at another constant expansion angle). In one or more other implementations, the slot width can have non-linear variations along the length of the channel housing  310 . It is appreciated that the exact expansion profile of a slot can be tailored for a particular implementation, to create a desired directivity of the sound projected from the acoustic duct  313  and/or the acoustic duct  314 . 
     In one or more implementations, the slots  312 , and/or one or more transverse slots such as the slots  400 , may be covered by an acoustic mesh. In one or implementations, an acoustic mesh that covers the slots  312  and/or one or more transvers slots such as the slots  400  may have an acoustic resistance value that changes along the length of the acoustic duct  313  and/or the acoustic duct  314  (e.g., along a direction away from the sound-generating element  300  and parallel to the longitudinal axis of the channel housing  310 ). For example, providing an acoustic mesh with an acoustic resistance value that changes along the length of the acoustic duct  313  and/or the acoustic duct  314  may help improve the directionality of the respective acoustic duct (e.g., as a function of frequency). 
     In the examples of  FIGS.  3  and  4   , the slot(s)  312  and/or the slots  400  allow portions of the sound generated by the sound-generating element  300  to leak out of each of the acoustic ducts to the external environment at various locations along the length of the acoustic ducts. Because the sound that exits the slot(s) leaks out of the acoustic ducts to at various distances from the sound-generating element, the sound exits with varied phases that substantially cancel out the sound in a direction perpendicular to the longitudinal axis of each acoustic duct. In this way, the acoustic duct  313  directs a portion of the sound through the opening  311  in a first direction along of the longitudinal axis of the channel housing and away from sound-generating element, and the acoustic duct  314  directs the other portion of the sound through the opening  315  in a second direction along of the longitudinal axis of the channel housing and away from sound-generating element. In this example, the first direction is substantially opposite the second direction. However, by modifying the orientation of one or both of the acoustic ducts  313  and  314 , while maintaining the sound-generating element at the origin of both acoustic ducts, the dual-directional speaker of  FIG.  3    can be modified to direct sound in any two directions. Moreover, one or more additional directional features (e.g., acoustic ducts with slots) can be added extending from the sound-generating element  300  and to opposing open end to direct sound from the sound-generating element in one or more additional directions. In one or more other implementations, each of several acoustic ducts with slots can be provided with its own corresponding sound-generating element, so that each acoustic duct can be used in combination with and/or separately from the other acoustic ducts to direct particular sounds in particular desired directions. 
       FIG.  5    illustrates an implementation in which a pair of dual-directional speakers (e.g., a pair of the speakers  118  of  FIG.  3    or the speakers  118  of  FIG.  4   ) are implemented in the apparatus  100  of  FIGS.  1  and  2   . In the example of  FIG.  5   , the apparatus  100  includes the structural support member  104 , a safety component  116  mounted to the structural support member  104 , top housing structure  138  and sidewall housing structure  140  (e.g., formed by a single curved glass enclosure structure sealingly mounted to the structural support member  104 ), a first directional speaker (e.g., a dual-directional implementation of speaker  118 ) mounted to a first side  134  of the structural support member  104 , and a second directional speaker (e.g., a second dual-directional implementation of speaker  118 ) mounted to a second side  135  of the structural support member  104 . In one or more implementations, the first directional speaker (e.g., a first dual-directional implementation of speaker  118 ) mounted to the first side  134  of the structural support member  104  and the second directional speaker (e.g., a second dual-directional implementation of speaker  118 ) mounted to the second side  135  of the structural support member may each be implemented as a dual-directional speaker, as described above in connection with  FIG.  3    or  FIG.  4   . For example, as shown in  FIG.  5   , the first directional speaker mounted to the first side  134  of the structural support member  104  and the second directional speaker mounted to the second side  135  of the structural support member  104  each include a pair of acoustic ducts that are oriented in opposite directions along a common longitudinal axis. 
     For example, the first directional speaker may be mounted to the first side  134  of the structural support member  104  such that a longitudinal axis of the first directional speaker is parallel to a longitudinal axis of the second directional speaker mounted to the second side  135  of the structural support member, as shown in  FIG.  5   . As shown in  FIG.  5   , the orientation of the first directional speaker mounted to the first side  134  of the structural support member  104  allows the first directional speaker mounted to the first side  134  of the structural support member  104  to project sound to a first region  500  and a second region  504  within the enclosed environment  131 , without projecting sound to a third region  502  within the enclosed environment  131 . In this example, the orientation of the second directional speaker mounted to the second side  135  of the structural support member  104  allows the second directional speaker mounted to the second side  135  of the structural support member  104  to project sound to a fourth region  506  and a fifth region  510  within the enclosed environment  131 , without projecting sound to a sixth region  508  within the enclosed environment  131 . 
     In one or more implementations, the apparatus  100  may be implemented as a moveable platform such as a vehicle, the structural support member  104  defines a structural space  130 , and the safety component  116  may be implemented as an airbag that is mounted in the structural space  130 . In one or more other implementations, the safety component  116  may be implemented as a sprinkler head or other fire suppression component in a building or in a vehicle. 
     In one or more implementations, the first region  500 , the second region  504 , the fourth region  506 , and the fifth region  510  may be occupant regions of the enclosed environment  131 . For example, the apparatus  100  may include one or more seats or standing areas in one or more of the first region  500 , the second region  504 , the fourth region  506 , and the fifth region  510  that can be temporally occupied by an occupant. 
     For example, the apparatus  100  may include first, second, third, and/or fourth seats (e.g., in the first region  500 , the second region  504 , the fourth region  506 , and/or the fifth region  510  respectively). In one or more implementations the first seat faces the second seat, the third seat faces the fourth seat, the first directional speaker (e.g., a first dual-directional implementation of speaker  118 , as shown) is disposed between the first and second seats, and the second directional speaker (e.g., second dual-directional implementation of speaker  118 , as shown) is disposed between the third and fourth seats. In this configuration, the first directional speaker may include a first elongated channel (e.g., acoustic duct  313 ) that directs audio output toward the first seat and a second elongated channel (e.g., acoustic duct  314 ) that directs audio output toward the second seat, and the second directional speaker may include a third elongated channel (e.g., acoustic duct  313 ) that directs audio output toward the third seat and a fourth elongated channel (e.g., acoustic duct  314 ) that directs audio output toward the fourth seat. 
       FIG.  6    illustrates a schematic top view of an example implementation of the apparatus  100  in which the speaker  118  is implemented as a speaker of a ringed array of speakers. In the example of  FIG.  6   , the apparatus  100  includes the enclosure  108  and a seat  600  within the enclosure  108 . As shown, the seat  600  may have a seat back  602  with a first side  601  configured to interface with an occupant within the enclosure (e.g., when the occupant is seated on the seat  600  and resting their back against the seat back  602 ), and an opposing second side  603 . As indicated, the seat  600  may be an implementation of the support feature  117  of  FIG.  2   . 
     In the example of  FIG.  6   , the apparatus  100  also includes a speaker array  610  spaced apart from the opposing second side  603  of the seat back  602 , and having a center  650 . In this example, the speaker array  610  includes an array of three speakers  118  that are mounted at a first common radial distance from the center  650  of the speaker array. In this example, the speaker array  610  may be operated as a beamforming array that generates interference patterns in sound emitted by the speakers  118  (e.g., by coordinating the time and frequency with which each speaker of the array emits sound) to controllably beam audible sound in a desired direction from the array. In one or more implementations, different audio channels (e.g., different content channels, such as surround sound channels which may include a front channel, a right channel, a left channel, a rear height channel, a left surround channel, and/or a right surround channel, in one or more implementations) may be beamed in different directions from the speaker array  610 . This is in contrast with surround sound systems that use a dedicated speaker for each surround sound channel, the dedicated speakers located at the locations from which the corresponding channel is desired to originate. 
     In one or more implementations, the apparatus  100  may also include control circuitry (e.g., including processor  190  and/or memory  107  of  FIG.  2   ) that receives a first audio channel and a second audio channel, and operates the speaker array  610  to beam a first sound  606  corresponding to the first audio channel (e.g., a rear height channel) toward the seat  600  and/or toward a ceiling or roof (e.g. toward the top housing structure  138  of  FIG.  1   ) of the enclosure  108 , and beam a second sound  615  corresponding to the second audio channel (e.g., an ambience channel) toward a portion  618  of the enclosure  108  away from the seat  600 . For example, the portion  618  of the enclosure  108  away from the seat  600  may include a rear wall or a rear window of the enclosure. 
     For example, the control circuitry may operate the speaker array  610  to beam the second sound directly away from the seat  600  toward a rear wall of the enclosure  108 . As illustrated in the example of  FIG.  6   , the control circuitry may also beam a third sound  611  corresponding to a third audio channel (e.g., a left surround channel) toward a first corner  612  of the enclosure  108 , and to beam a fourth sound  613  corresponding to a fourth audio channel (e.g., a right surround channel) toward a second corner  614  of the enclosure  108 . In this way, the speaker array  610  may act as a directional beamforming speaker array that generates sounds that occupants within the enclosure  108  perceive as originating from various locations away from the speaker array  610  to provide a surround sound experience within the enclosed environment  131 . 
     In the example of  FIG.  6   , the speaker array  610  is arranged such that the speakers  118  face substantially upward (e.g., toward a top housing structure  138 ). In this arrangement, the speaker array  610  is separated from the opposing second side  603  of the seat back  602  in a direction parallel to a plane that passes through a common point (e.g., a center, or a particular other particular point that is present on each of the speakers  118 ) on each speaker  118  of the speaker array  610 . 
     In one or more implementations, the apparatus  100  may also include an additional seat (e.g., seat  670 ) within the enclosure  108 . As shown, the seat  670  may have a seat back  672  with a first side  671  facing the first side  601  of the seat back  602  of the seat  600  and configured to interface with another occupant seated on the seat  670  within the enclosure  108 , and an opposing second side  673 . In one or more implementations, the apparatus  100  may also include an additional speaker array  680  spaced apart from the opposing second side  673  of the seat back  672  of the seat  670  and having a center  690 . As shown, the additional speaker array  680  may include a first array of three speakers  118  mounted at a first common radial distance from the center  690  of the additional speaker array  680 . 
     In the example of  FIG.  6   , the additional speaker array  680  beams the first sound  606  corresponding to the first audio channel (e.g., the rear height channel) toward the seat  670  and/or toward a ceiling or roof (e.g., toward the top housing structure  138  of  FIG.  1   ) of the enclosure  108 , and beams the second sound  615  corresponding to the second audio channel (e.g., the ambience channel) toward a portion  688  of the enclosure  108  away from the seat  670 . For example, the portion  688  of the enclosure  108  away from the seat  600  may include a front wall or a front window of the enclosure. Because the seats  600  and  670  face each other (e.g., and both face toward the center of the apparatus), an occupant seated in the seat  670  may perceive the front wall or front window of the apparatus as being a rear location for that occupant. The control circuitry of the apparatus  100  may operate the additional speaker array  680  to beam the second sound directly away from the seat  670  toward a front wall of the enclosure  108 . 
     As illustrated in the example of  FIG.  6   , the control circuitry may also beam the third sound  611  corresponding to the third audio channel (e.g., the left surround channel) toward a third corner  684  of the enclosure  108 , and to beam the fourth sound  613  corresponding to the fourth audio channel (e.g., the right surround channel) toward a fourth corner  682  of the enclosure  108 . In this way, the additional speaker array  680  may act as a directional beamforming speaker array that generates sounds that occupants within the enclosure  108  perceive as originating from various locations away from the additional speaker array  680 . 
     In the example of  FIG.  6   , seat  670  faces the seat  600 , and may also be facing a rear of the apparatus  100  (e.g., a vehicle). However, this is merely illustrative and, in other implementations, the seat  670  may face in the same direction as the seat  600  (e.g., toward the front of a vehicle). In one or more implementations, the seat  670  may be rotatable from an orientation that faces in the same direction as the seat  600  (e.g., toward the front of a vehicle, such as in a human operator mode or a semiautonomous mode) to an orientation that faces toward the seat  600  (e.g., in the opposite direction of direction in which the seat  600  faces, such as in an autonomous driving mode) or to another orientation such as facing out the left or right side of the vehicle (e.g., in the autonomous driving mode). In any of these implementations, each of the seats or each group of seats that faces the same direction within the apparatus may have a corresponding speaker array (e.g., speaker array  610  and/or speaker array  680 ) mounted behind the seat back, or a speaker array (e.g., speaker array  610 ) may be mounted behind a row or behind several rows of seats that face in the same direction. 
       FIG.  7    illustrates additional details of the speaker array  610  in accordance with one or more implementations. The example of  FIG.  7    is described in connection with the speaker array  610 , for convenience. However, the structures of the speaker array  610  of  FIG.  7    may also be implemented in the additional speaker array  680  of  FIG.  6    (e.g., rotated one-hundred eighty degrees when arranged in the implementation of  FIG.  6   ). 
     As shown in  FIG.  7   , the speaker array  610  may include a support structure  700  (e.g., a frame) to which the speakers  118  are mounted. As shown, the speaker array  610  may include a first array of speakers  118  mounted at a first common radial distance  701  from the center  650  of the speaker array  610 , and a second array of speakers  118 M mounted at a second common radial distance  708  from the center  650  of the speaker array  610 . In this example, the second common radial distance  708  is larger than the first common radial distance  701 . In this example, the first array of speakers  118  is a first triangular array of three speakers  118 , and the second array of speakers  118 M is a second triangular array of three speakers  118 M, and the speakers  118 M of the second triangular array have a common size (e.g., a common diameter or common area of the speaker diaphragm) that is larger than a common size (e.g., a common diameter or common area of the speaker diaphragm) of the speakers  118  of the first triangular array. For example, the speakers  118 M may be mid-range speakers of the speaker array  610  and the speaker  118  of the speaker array  610  may be tweeters. In this example, the first triangular array is rotated, within the plane in which the speakers are mounted, relative to the second triangular array. 
     In one or more implementations, the apparatus  100  may include control circuitry for the speaker array  610 . For example, the control circuitry for the speaker array  610  may include a control channel and a digital signal processor for each speaker  118  of the first array of speakers and each speaker  118 M of the second array of speakers. As another example, each speaker  118  of the first array of speakers  118  may form (e.g., may be wired to form) a speaker pair with a respective speaker  118 M of the second array of speakers (e.g., a speaker  118 M disposed anti-clockwise across the array). In these implementations, the control circuitry for the speaker array  610  may include a control channel and a digital signal processor for each speaker pair, and a passive crossover circuit for each control channel. For example, the passive crossover circuit may include an inductor and a capacitor (e.g., arranged to form a first order crossover network) that passively cause audio signals below a lower frequency threshold to be provided to a speaker  118 M of a speaker pair, audio signals above an upper frequency threshold to be provided to a speaker  118  of the speaker pair, and audio signals between the lower frequency threshold and the upper frequency threshold to be provided to both the speaker  118  and the speaker  118 M of the speaker pair. 
     In one or more implementations, one or more of the speakers  118  of the first array of speakers  118  and/or one or more of the speakers  118 M of the second array of speakers may be provided with a directional output component, such as an acoustic duct. For example,  FIG.  8    illustrates an exemplary implementation in which the first triangular array of three speakers  118  includes a directional speaker having an acoustic duct  800  with one or more slots such as slot  802 . In this example, the slot(s)  802  allow portions of the sound generated by a sound-generating element acoustically coupled to the acoustic duct  800  to leak out of the acoustic duct  800  to the external environment at various locations along the length of the acoustic duct  800 . Because the sound that exits the slot(s)  802  leaks out of the acoustic duct  800  at various distances from the sound-generating element, the sound exits with varied phases that substantially cancel out the sound in a direction perpendicular to the longitudinal axis of the acoustic duct  800 . In this way, the acoustic duct  800  directs the sound through a direction along a longitudinal axis of the acoustic duct  800  and to a desired location within the enclosure  108 . Although the example of  FIG.  8    illustrates one speaker of the speaker array  610  having an acoustic duct, in other implementations, two, three, or more than three of the speakers of the speaker array  610  may be provided with an acoustic ducts oriented in various directions, in various implementations. 
       FIG.  9    illustrates a top view of the apparatus  100  in which the speaker  118  is implemented as an isobaric cross-firing speaker. In the example of  FIG.  9   , the apparatus  100  includes the enclosure  108 , a seat  600  (e.g., a first seat) within the enclosure  108  and facing in a first direction, a seat  670  (e.g., a second seat) within the enclosure  108  and facing in a second direction substantially opposite the first direction, and a speaker  118 , implemented as a first isobaric speaker, and mounted nearer the seat  600  than the seat  670 . 
     As illustrated by the example of  FIG.  9   , the apparatus  100  may also include a speaker  118  (e.g., a second isobaric speaker) mounted nearer the seat  670  than the seat  600 , a seat  900  (e.g., a third seat) laterally displaced from the seat  600  and facing in the first direction, a seat  970  (e.g., a fourth seat) laterally displaced from the seat  670  and facing in the second direction, a speaker  118  (e.g., a third isobaric speaker) mounted nearer the seat  900  than the seat  600 , the seat  670 , and the seat  970 , and/or a speaker  118  (e.g., a fourth isobaric speaker) mounted nearer the seat  970  than the seat  600 , the seat  970 , and the seat  900 . In this example, the speakers  118  may be mounted substantially above a corresponding one of the seats within the apparatus  100 . In one or more implementations, the apparatus  100  may be implemented as a vehicle, the enclosure  108  may include a roll cage (e.g., including and/or formed by the structural support member  104  of  FIG.  1   ) for the vehicle, and one or more or all of the isobaric speakers may be mounted to the roll cage. 
     In the example of  FIG.  9   , seats  670  and  970  respectively face the seats  600  and  900 , and may also be facing a rear of the apparatus  100 . However, this is merely illustrative and, in other implementations, the seats  670  and/or  970  may face in the same direction as that of the seats  600  and  900  (e.g., toward the front of a vehicle). In one or more implementations, the seats  670  and  970  may be rotatable from an orientation that faces in the same direction as the seats  600  and  900  (e.g., toward the front of a vehicle, such as in a human operator mode or a semiautonomous mode) to an orientation that faces toward the seats  600  and  900  (e.g., in the opposite direction of the direction in which the seats  600  and  900  face, such as in an autonomous driving mode) or to another orientation such as facing out the left or right side of the vehicle (e.g., in the autonomous driving mode). In any of these implementations, each of the seats of the apparatus may have a corresponding isobaric speaker mounted above and/or in front of that seat (e.g., as described herein in the examples of  FIGS.  10 - 12   ). 
       FIG.  10    illustrates additional details of an isobaric speaker as in the example of  FIG.  9   . As shown in  FIG.  10   , when implemented as an isobaric speaker, the speaker  118  may include a housing  1000  defining a back volume  1002 , a first speaker diaphragm  1004  having a first surface  1020  adjacent the back volume  1002  and an opposing second surface  1022  facing outward, and a second speaker diaphragm  1006  having a first surface  1024  adjacent the back volume  1002  (e.g., the same back volume  1002 , which may be referred to herein as a shared back volume) and an opposing second surface  1026  facing outward at an angle different from the angle at which the first speaker diaphragm  1004  faces. In this configuration, in operation, the first speaker diaphragm  1004  projects sound  1008  in a first direction and the second speaker diaphragm  1006  projects sound  1010  in a second direction different from the first direction. 
     In one or more implementations, one or more instances of the isobaric speaker of  FIG.  10    may be mounted in the apparatus  100 , such as in the configuration shown in  FIG.  9   . When mounted in the configuration of  FIG.  9   , the isobaric speaker of  FIG.  10    may correspond to the first isobaric speaker, and the second surface  1022  of the first speaker diaphragm  1004  may face the seat  600 , and the opposing second surface  1026  of the second speaker diaphragm  1006  may face away from the seat  600 . As examples, the opposing second surface  1026  of the second speaker diaphragm  1006  may face the seat  670 , a central location between the seat  600  and the seat  670 , or substantially horizontally along a direction parallel to a direction extending between the seat  600  the seat  670 . 
     As illustrated in  FIG.  11   , in a configuration in which the isobaric speaker of  FIG.  10    is a first isobaric speaker mounted substantially above the seat  600 , the isobaric speaker is operable in a first out-of-phase mode of operation in which the first speaker diaphragm  1004  emits a positive polarity sound  1008  and the second speaker diaphragm  1006  moves out of phase with the first speaker diaphragm  1004  to emits a negative polarity sound  1008  that cancels a portion of the positive polarity sound  1010  in a direction away from the seat  600 . As shown, in this first out-of-phase mode of operation, the isobaric speaker directs an audible beam  1102  toward the seat  600  and a null beam  1104  toward another location  1100 , such as toward the seat  670  and/or toward a location between the seat  600  and the seat  670 . 
     As illustrated in  FIG.  12   , the first isobaric speaker is also operable in a second out-of-phase mode of operation in which the first speaker diaphragm  1004  emits a negative polarity sound  1008  and the second speaker diaphragm emits a positive polarity sound  1010  that cancels a portion of the negative polarity sound  1008  in a direction of the seat  600 . As shown, in this second out-of-phase mode of operation, the isobaric speaker directs an audible beam  1202  toward the location  1100 , and a null beam  1204  toward the seat  600 . In this way, the isobaric speaker of  FIGS.  10 - 12    can selectively beam audio content toward a particular seat or another particular location within the enclosure  108 . 
     In various implementations, any or all of the speakers  118  of  FIG.  9    can be implemented using the isobaric speaker implementation of  FIG.  10   , and/or operated in either of the out-of-phase modes of operation illustrated in  FIGS.  11  and  12   . It is appreciated that isobaric speakers mounted in the front and rear of the apparatus  100  may be mounted in orientations that are rotated by one hundred eighty degrees relative to each other, or at any other relative angle suitable to face a first speaker diaphragm toward a seat or other occupant location and a second speaker diaphragm that shares the same back volume away from that seat and/or toward another seat or toward a non-occupant location. 
     Because the first speaker diaphragm  1004  and the second speaker diaphragm  1006  of the isobaric speaker described herein operate out of phase with each other, pressure changes within the back volume  1002  are minimal during operation of the isobaric speaker, and thus the back volume  1002  may be a compact back volume. Providing the isobaric speaker with a compact back volume allows the speaker  118  to have a compact overall size, such as for mounting in compact spaces within the apparatus  100  (e.g., within or mounted to a structural support member and/or or a roll cage of a vehicle). 
       FIG.  13    illustrates an example in which the speaker  118  is implemented as a speaker of a door-mounted speaker array. As illustrated in the example of  FIG.  13   , in one or more implementations, the apparatus  100  may include the enclosure  108 , an access feature  114  (e.g., a door) to the enclosure  108 , and a beamforming speaker array  1300  mounted in the access feature. For example, the beamforming speaker array  1300  may include multiple speakers  118  that are co-operable to beam sound in one or more desired directions within the enclosed environment  131  within the enclosure  108 . 
     In one or more implementations, the beamforming speaker array  1300  is a beamforming tweeter array (e.g., an array of multiple tweeters that are co-operable to beam sound in one or more desired directions within the enclosed environment  131  within the enclosure  108 ). In one or more implementations, the beamforming speaker array  1300  includes at least three speakers  118 . In one or more implementations, at least two of the of the at least three speakers  118  of the beamforming speaker array  1300  share a common back volume. In one or more other implementations, each of the at least three speakers  118  of the beamforming speaker array  1300  have a dedicated individual back volume. 
     In one or more implementations, the apparatus  100  includes control circuitry (e.g., including the processor  190  and/or the memory  107  of  FIG.  2   ) that operates the beamforming speaker array  1300 . For example, the control circuitry may operate the beamforming speaker array  1300  (e.g., by selectively operating the individual speakers  118  of the speaker array to generate positive and negative interference regions within the enclosure  108 ) to beam a sound  1302  to arrive at a first location within the enclosure  108  at a first volume, and to beam the sound  1302  to arrive at a second location within the enclosure  108  at the first volume, the second location being further from the beamforming speaker array  1300  than the first location is from the beamforming speaker array  1300 . 
     For example, as illustrated in  FIG.  12   , the first location may correspond a location of a first seat (e.g., seat  600 ) within the enclosure  108 , and the second location corresponds to a location of a second seat (e.g., seat  900 ) within the enclosure  108 . In one or more implementations, the apparatus  100  of  FIG.  13    may be implemented as a vehicle. As shown in  FIG.  13   , the apparatus  100  may include an additional access feature  114  (e.g., an additional door) to the enclosure  108 , the additional access feature  114  positioned opposite the access feature  114 . As shown, the apparatus  100  may also include an additional beamforming speaker array (e.g., an additional implementation of the beamforming speaker array  1300 ) mounted in the additional access feature  114 . 
     In one or more implementations, the control circuitry of the apparatus  100  may operate the beamforming speaker array  1300  on the opposite side of the apparatus (e.g., by selectively operating the individual speakers  118  of the additional beamforming speaker array to generate positive and negative interference regions within the enclosure  108 ) to beam a sound  1306  to arrive at the first location within the enclosure  108  at a second volume, and to beam the sound  1306  to arrive at the second location within the enclosure  108  at the second volume. With respect to the beamforming speaker array  1300  on the opposite side of the apparatus, the first location (e.g., the location of the seat  600 ) is further from this beamforming speaker array  1300  than the second location (e.g., the location of the seat  900 ) is from this beamforming speaker array  1300 . 
     Because the seat  600  is nearer to the access feature  114  on the right side of the apparatus  100  than the seat  900  is to the access feature  114 , a standard (e.g., non-beam-forming) speaker mounted in that access feature  114  will generate sound that is louder at the location of the seat  600  than at the location of the seat  900 . Moreover, the sound from such a standard speaker will arrive at the location of the seat  600  before the same sound arrives at the location of the seat  900 . Similarly, a standard speaker mounted in the additional access feature  114  (e.g., a second door) on the opposing (e.g., left) side of the enclosure  108  will generate sound that is louder at the location of the seat  900  than at the location of the seat  600  and that arrives at the location of the seat  900  before the same sound arrives at the location of the seat  600 . These differences in volume and time-of-arrival of the sound from the speakers on the opposing sides of the enclosure  108  can cause a psycho-acoustic effect in which an occupant in the seat  600  perceives the speaker in the nearer access feature  114  to the seat  600  as the center origin of the sound, and an occupant in the seat  900  perceives the speaker in the nearer access feature  114  to the seat  900  as the center origin of the sound. This can be undesirable in various use cases, such as in a case in which the apparatus has a center speaker  1311  that is intended to be perceived as the center origin of the sound within the enclosure  108  (e.g., a center speaker  1311  that generates sound corresponding to center audio channel). 
     Providing the apparatus with the beamforming speaker arrays  1300  on the opposing sides of the enclosure  108  (e.g., mounted within or to the opposing access features  114 ) as illustrated in  FIG.  13   , and operating the beamforming speaker array  1300  on the right side of the apparatus to beam the sound  1302  to arrive at the first and second locations with the same first volume, and the beamforming speaker array  1300  on the left side of the apparatus to beam the sound  1306  to arrive at the first and second locations with the same second volume, can help reduce an occupant&#39;s perception of the center origin of the sound being located at one side of the enclosure. 
     In one or more implementations, the control circuitry may also operate the beamforming speaker array  1300  on the left side of the apparatus to beam the sound  1302  to arrive at the first location (e.g., the location of the seat  600 ) within the enclosure at a first time, and to beam the sound  1302  to arrive at the second location (e.g., the location of the seat  900 ) within the enclosure at the first time (e.g., at the same time, such as by delaying, in time, the beam that is directed at the first location relative to the beam that is directed at the second location). Similarly, the control circuitry may also operate the beamforming speaker array  1300  on the left side of the apparatus to beam the sound  1306  to arrive at the second location (e.g., the location of the seat  900 ) within the enclosure  108  at a second time, and to beam the sound  1306  to arrive at the first location (e.g., the location of the seat  600 ) within the enclosure  108  at the second time (e.g., at the same time, such as by delaying, in time, the beam that is directed at the second location relative to the beam that is directed at the first location). Controlling the beams from the beamforming speaker arrays  1300  to arrive at multiple locations within the enclosure  108  at the same time, can further help reduce an occupant&#39;s perception of the center origin of the sound being located at one side of the enclosure. 
     In the examples described above in connection with  FIG.  13   , the beamforming speaker arrays  1300  are operable to beam sound to arrive at the same volume and/or at the same time at the locations of the seat  600  and the seat  900 . It is also appreciated that the beamforming speaker arrays  1300  are also operable to beam sound to arrive at the same volume and/or at the same time at the locations of a seat  670  and/or a seat  970  within the enclosure  108  (e.g., in the configuration shown in  FIG.  13    in which the seats  670  and  970  face the seats  600  and  900 , or in another configuration in which the seats  670  and/or  970  face in the same direction as the seat  600  and/or the seat  900  or in another direction). 
     Although examples of separate implementations of the apparatus  100  are described herein in which the apparatus includes one or more dual directional speakers, one or more ringed arrays of speakers, one or more isobaric cross-firing speakers, and/or one or more door-mounted speaker arrays for convenience of the discussion, it is appreciated that any combination of one or more dual directional speakers, one or more ringed arrays of speakers, one or more isobaric cross-firing speakers, and/or one or more door-mounted speaker arrays can be implemented in the same apparatus  100 . 
     Various processes defined herein consider the option of obtaining and utilizing a user&#39;s personal information. For example, such personal information may be utilized in order to provide directional audio within an enclosed environment. However, to the extent such personal information is collected, such information should be obtained with the user&#39;s informed consent. As described herein, the user should have knowledge of and control over the use of their personal information. 
     Personal information will be utilized by appropriate parties only for legitimate and reasonable purposes. Those parties utilizing such information will adhere to privacy policies and practices that are at least in accordance with appropriate laws and regulations. In addition, such policies are to be well-established, user-accessible, and recognized as in compliance with or above governmental/industry standards. Moreover, these parties will not distribute, sell, or otherwise share such information outside of any reasonable and legitimate purposes. 
     Users may, however, limit the degree to which such parties may access or otherwise obtain personal information. For instance, settings or other preferences may be adjusted such that users can decide whether their personal information can be accessed by various entities. Furthermore, while some features defined herein are described in the context of using personal information, various aspects of these features can be implemented without the need to use such information. As an example, if user preferences, account names, and/or location history are gathered, this information can be obscured or otherwise generalized such that the information does not identify the respective user. 
     In accordance with aspects of the subject disclosure, an apparatus is provided that includes a structural support member; a safety component mounted to the structural support member; a curved glass enclosure structure sealingly mounted to the structural support member; a first directional speaker mounted to a first side of the structural support member; and a second directional speaker mounted to a second side of the structural support member. 
     In accordance with aspects of the subject disclosure, an apparatus is provided that includes an enclosure; a seat within the enclosure, the seat having a seat back with a first side configured to interface with an occupant within the enclosure, and an opposing second side; and a speaker array spaced apart from the opposing second side of the seat back and having a center, the speaker array including: a first array of speakers mounted at a first common radial distance from the center of the speaker array; and a second array of speakers mounted at a second common radial distance from the center of the speaker array, the second common radial distance larger than the first common radial distance. 
     In accordance with aspects of the subject disclosure, an apparatus is provided that includes an enclosure; a first seat within the enclosure and facing in a first direction; a second seat within the enclosure and facing in a second direction substantially opposite the first direction; and a first isobaric speaker mounted nearer the first seat than the second seat, the first isobaric speaker including: a housing defining a back volume; a first speaker diaphragm having a first surface adjacent the back volume and an opposing second surface facing the first seat; and a second speaker diaphragm having a first surface adjacent the back volume and an opposing second surface facing away from the first seat. 
     In accordance with aspects of the subject disclosure, an apparatus is provided that includes an enclosure; a door to the enclosure; and a beamforming speaker array mounted in the door. 
     Implementations within the scope of the present disclosure can be partially or entirely realized using a tangible computer-readable storage medium (or multiple tangible computer-readable storage media of one or more types) encoding one or more instructions. The tangible computer-readable storage medium also can be non-transitory in nature. 
     The computer-readable storage medium can be any storage medium that can be read, written, or otherwise accessed by a general purpose or special purpose computing device, including any processing electronics and/or processing circuitry capable of executing instructions. For example, without limitation, the computer-readable medium can include any volatile semiconductor memory, such as RAM, DRAM, SRAM, T-RAM, Z-RAM, and TTRAM. The computer-readable medium also can include any non-volatile semiconductor memory, such as ROM, PROM, EPROM, EEPROM, NVRAM, flash, nvSRAM, FeRAM, FeTRAM, MRAM, PRAM, CBRAM, SONOS, RRAM, NRAM, racetrack memory, FJG, and Millipede memory. 
     Further, the computer-readable storage medium can include any non-semiconductor memory, such as optical disk storage, magnetic disk storage, magnetic tape, other magnetic storage devices, or any other medium capable of storing one or more instructions. In one or more implementations, the tangible computer-readable storage medium can be directly coupled to a computing device, while in other implementations, the tangible computer-readable storage medium can be indirectly coupled to a computing device, e.g., via one or more wired connections, one or more wireless connections, or any combination thereof. 
     Instructions can be directly executable or can be used to develop executable instructions. For example, instructions can be realized as executable or non-executable machine code or as instructions in a high-level language that can be compiled to produce executable or non-executable machine code. Further, instructions also can be realized as or can include data. Computer-executable instructions also can be organized in any format, including routines, subroutines, programs, data structures, objects, modules, applications, applets, functions, etc. As recognized by those of skill in the art, details including, but not limited to, the number, structure, sequence, and organization of instructions can vary significantly without varying the underlying logic, function, processing, and output. 
     While the above discussion primarily refers to microprocessor or multi-core processors that execute software, one or more implementations are performed by one or more integrated circuits, such as ASICs or FPGAs. In one or more implementations, such integrated circuits execute instructions that are stored on the circuit itself. 
     Those of skill in the art would appreciate that the various illustrative blocks, modules, elements, components, methods, and algorithms described herein may be implemented as electronic hardware, computer software, or combinations of both. To illustrate this interchangeability of hardware and software, various illustrative blocks, modules, elements, components, methods, and algorithms have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application. Various components and blocks may be arranged differently (e.g., arranged in a different order, or partitioned in a different way) all without departing from the scope of the subject technology. 
     It is understood that any specific order or hierarchy of blocks in the processes disclosed is an illustration of example approaches. Based upon design preferences, it is understood that the specific order or hierarchy of blocks in the processes may be rearranged, or that all illustrated blocks be performed. Any of the blocks may be performed simultaneously. In one or more implementations, multitasking and parallel processing may be advantageous. Moreover, the separation of various system components in the implementations described above should not be understood as requiring such separation in all implementations, 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. 
     As used in this specification and any claims of this application, the terms “base station”, “receiver”, “computer”, “server”, “processor”, and “memory” all refer to electronic or other technological devices. These terms exclude people or groups of people. For the purposes of the specification, the terms “display” or “displaying” means displaying on an electronic device. 
     As used herein, the phrase “at least one of” preceding a series of items, with the term “and” or “or” to separate any of the items, modifies the list as a whole, rather than each member of the list (i.e., each item). The phrase “at least one of” does not require selection of at least one of each item listed; 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. 
     The predicate words “configured to”, “operable to”, and “programmed to” do not imply any particular tangible or intangible modification of a subject, but, rather, are intended to be used interchangeably. In one or more implementations, a processor configured to monitor and control an operation or a component may also mean the processor being programmed to monitor and control the operation or the processor being operable to monitor and control the operation. Likewise, a processor configured to execute code can be construed as a processor programmed to execute code or operable to execute code. 
     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 implementations, one or more implementations, 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. 
     The word “exemplary” is used herein to mean “serving as an example, instance, or illustration”. Any embodiment described herein as “exemplary” or as an “example” is not necessarily to be construed as preferred or advantageous over other implementations. Furthermore, to the extent that the term “include”, “have”, or the like is used in the description or the claims, such term is intended to be inclusive in a manner similar to the term “comprise” as “comprise” is interpreted when employed as a transitional word in a claim. 
     All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. No claim element is to be construed under the provisions of 35 U.S.C. § 112(f) unless the element is expressly recited using the phrase “means for” or, in the case of a method claim, the element is recited using the phrase “step for”. 
     The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but are to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more”. Unless specifically stated otherwise, the term “some” refers to one or more. Pronouns in the masculine (e.g., his) include the feminine and neutral gender (e.g., her and its) and vice versa. Headings and subheadings, if any, are used for convenience only and do not limit the subject disclosure.