Transducer assembly

Abstract

There is provided a transducer assembly, comprising: a first diaphragm, a second diaphragm delimiting an aperture, and a plurality of motors for driving the second diaphragm. The second diaphragm at least one of: (i) surrounds the first diaphragm, or (ii) is arranged such that acoustic energy generated by the first diaphragm are directed through the aperture via a waveguide that is in fluid communication with the first diaphragm.

Description

TRANSDUCER ASSEMBLYCORSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims the benefit of priority to U.S. Patent Application No. 63 / 584,001, filed September 20, 2024. which is incorporated herein by reference in its entirety.FIELD OF THE DISCLOSURE

[0002] The present disclosure is related to consumer goods and, more particularly, to methods, systems, products, features, services, and other elements directed to media playback or some aspect thereof.BACKGROUND

[0003] Options for accessing and listening to digital audio in an out-loud setting were limited until 2002, when SONOS, Inc. began development of a new type of playback system. Sonos then filed one of its first patent applications in 2003, entitled “Method for Synchronizing Audio Playback between Multiple Networked Devices,’' and began offering its first media playback systems for sale in 2005. The Sonos Wireless Home Sound System enables people to experience music from many sources via one or more networked playback devices. Through a software control application installed on a controller (e.g., smartphone, tablet, computer, voice input device), one can play what she wants in any room having a networked playback device. Media content (e.g., songs, podcasts, video sound) can be streamed to playback devices such that each room with a playback device can play back corresponding different media content. In addition, rooms can be grouped together for synchronous playback of the same media content, and / or the same media content can be heard in all rooms synchronously.BRIEF DESCRIPTION OF THE DRAWINGS

[0004] Features, aspects, and advantages of the presently disclosed technology may be better understood with regard to the following description, appended claims, and accompanyingdrawings, as listed below. A person skilled in the relevant art will understand that the features shown in the drawings are for purposes of illustrations, and variations, including different and / or additional features and arrangements thereof, are possible.

[0005] Figure 1 is a functional block diagram illustrating certain aspects of an example playback device;

[0006] Figure 2A is a perspective view of a transducer assembly according to a first example;

[0007] Figure 2B is a plan view of the transducer assembly of Figure 2A;

[0008] Figure 3 is a plan view of a transducer assembly according to a second example;

[0009] Figure 4 is a plan view of a transducer assembly according to a third example;

[0010] Figure 5A is a perspective view of a transducer assembly mounted within a frame according to another example;

[0011] Figure 5B is a perspective view of part of the transducer assembly of Figure 5 A;

[0012] Figure 5C is a cutaway view of the transducer assembly of Figure 5B;

[0013] Figure 6A is a perspective view of a transducer assembly according to a further example; and

[0014] Figure 6B is a plan view of the transducer assembly of Figure 6A.DETAILED DESCRIPTIONI. Overview

[0015] Embodiments described herein relate to transducer assemblies and playback devices comprising one or more transducer assemblies. A transducer assembly as described herein may include an arrangement of two or more diaphragms, where each diaphragm can cause propagation of acoustic energy (i.e., sound) when driven by corresponding one or more motors. The specific types of transducer assemblies described can comprise two or more diaphragms arranged in a particular configuration to minimize the size, footprint, volume and / or profile of the transducer assembly. More compact transducer assemblies can enable a playback devicethat contains such a transducer assembly to itself be more compact, which can often be desirable for consumers.

[0016] In some examples, a transducer assembly includes one diaphragm having an aperture, and another diaphragm arranged such that sound output from the diaphragm travels through the aperture and / or along an axis that passes through the aperture. Accordingly, sound from both diaphragms travels away from the transducer assembly from substantially the same general location in space (in contrast, for example, to two diaphragms that are arranged next to each other). In a first aspect discussed in more detail below, the diaphragm with the aperture surrounds the other diaphragm (for example, the other diaphragm may be arranged within the aperture). In a second aspect discussed below, the diaphragm with the aperture may not necessarily surround the other diaphragm, but rather a waveguide can channel / direct sound from the other diaphragm through the aperture.

[0017] As such, according to a first aspect of the invention, there is provided a transducer assembly comprising: a first diaphragm, a second diaphragm, and a plurality of motors for driving the second diaphragm, wherein the second diaphragm delimits an aperture and surrounds the first diaphragm.

[0018] As briefly mentioned, such an arrangement of diaphragms allows the transducer assembly to have a smaller profile, and provides a more uniform sound profile, due to one diaphragm being surrounded by the other. Having a plurality of motors driving the second diaphragm means that the two diaphragms can be arranged closer together than two diaphragms that are each driven by a single motor, which is often positioned towards the centre of the diaphragm. For example, the plurality of motors may be offset from a centre of the diaphragm, meaning that a space between the plurality of motors can accommodate the first diaphragm.

[0019] As used herein, “surrounds the first diaphragm7’ may mean that the second diaphragm has an outer radius, outer perimeter or diameter (or cross-sectional width) that is greater thanan outer radius, outer perimeter or diameter (or cross-sectional width) of the first diaphragm, and a central axis of the first diaphragm extends through the aperture defined by the second diaphragm. In one example, the first diaphragm is arranged within the aperture, such that sound is output by the first diaphragm through the aperture. In another example, the first diaphragm is arranged in front of the aperture, such that sound is output by the first diaphragm but does not pass through the aperture. In certain examples, the first diaphragm radially overlaps the second diaphragm such that outer diameter (or cross-sectional width) of the first diaphragm is greater than or equal to the inner diameter (or cross-section width) of the second diaphragm. In these examples, a projection of the first and second diaphragms onto a plane perpendicular to the central axes of the diaphragms would have the outer perimeter (or edge) of the second diaphragm surrounding outer diameter of the first diaphragm. In some examples, however, at least a portion of the first diaphragm may radially overlap (or exceed) the outer diameter or edge of the second diaphragm. Consider, for instance, an annular-shaped second diaphragm and an elliptical-shaped first diaphragm axially spaced apart from the second diaphragm. In this scenario, the semimajor axis of the first diaphragm may exceed a diameter (or cross-section width) of the second diaphragm even if a substantial portion of the first diaphragm is surrounded by the outer perimeter or edge of the second diaphragm.

[0020] In some examples, the central or centroidal axis of the first diaphragm is either coaxial with a central or centroidal axis of the second diaphragm or approximately coaxial with the central axis of the second diaphragm. The axes may therefore be parallel. A central axis of a diaphragm may alternatively be known as (or be parallel to) a sound axis of the diaphragm, in some examples. A “sound axis" as used herein is an axis defining the main direction sound radiates from the diaphragm. In general, the sound axis will be parallel to the direction of movement of the diaphragm.

[0021] In another arrangement, the first and second central or centroidal (or sound) axes are offset and parallel (so are not coaxial).

[0022] In some examples, a radius or area of the aperture is greater than the outer radius or area of the first diaphragm.

[0023] In some examples, the first diaphragm is coplanar with the second diaphragm. Additionally, or alternatively, the motors may be coplanar with each other and / or with the diaphragm they drive.

[0024] Each motor of the plurality of motors may comprise a voice coil and a magnetic element (where a magnetic element may comprise one or more magnets). In a specific example, each motor of the plurality of motors comprises a voice coil and a set of two or more magnets. As is well known, when an electric current is passed through the voice coil, the interaction of the magnetic field generated by the voice coil causes the moveable voice coil to be displaced relative to the static magnetic element (or vice versa). The voice coil may be annular and extend around an axis (such as a coil axis). The magnetic element may be received within the voice coil, such that the voice coil extends around the magnetic element. The voice coil may be displaced along the coil axis.

[0025] In some arrangements, each motor of the plurality of motors may comprise a voice coil enclosure containing the voice coil. In some cases, the voice coil enclosure is coupled to a suspension system, and the suspension system (also known as a spider or speaker damper) is connectable to a frame of the speaker / playback device. In some cases, the voice coil enclosures of each motor are coupled to a support assembly, where the support assembly transfers movement of the voice coils to the second diaphragm. In one example, the support assembly comprises one or more connecting members, and the one or more connecting members are coupled to the second diaphragm. As such, in some arrangements, the plurality of motors are each coupled directly and / or indirectly to the second diaphragm, such that movement of themotor (such as part of the motor) transfers movement to the second diaphragm. For example, as the voice coil is displaced, the voice coil enclosure is also displaced, which in turn causes the support assembly to be displaced. The movement of the support assembly thus transfers movement to the second diaphragm.

[0026] In a particular example, there are exactly three motors for the second diaphragm. The three motors may be arranged in a triangular arrangement, such as an equilateral triangle, for example.

[0027] In a particular example, the first diaphragm is a passive radiator, so is not actively driven by one or more motors. The passive radiator may be transparent, in some examples. In another example, the first diaphragm is driven by a single motor, wherein the motor comprises a voice coil and a single magnet or multiple magnets. As such, the transducer assembly may further comprise a single motor for driving the first diaphragm.

[0028] In examples, the second diaphragm is ring shaped. In some examples, the first diaphragm may have flat shape, a flat circular shape, a conical shape or a conical frustum shape.

[0029] In some examples, the first diaphragm may be configured to generate, transmit, output, or propagate first acoustic energy, and the second diaphragm may be configured to generate, transmit, output, or propagate second acoustic energy, and the first diaphragm is arranged relative to the second diaphragm such that the first acoustic energy is substantially directed through the aperture. Acoustic energy may be alternatively known as acoustic waves, in some examples.

[0030] In certain arrangements, a surface area of the second diaphragm (not including the “area’’ of the aperture) is greater than a surface area of the first diaphragm. In some examples, the second diaphragm additionally or alternatively has a larger excursion than the first diaphragm. The second diaphragm may therefore displace a greater volume of air than the first diaphragm, which can be useful to generate low frequencies.

[0031] In particular examples, the first diaphragm is axially aligned with the aperture (that is, the first and second diaphragms are not displaced from each other in a direction along an axis, such as a central axis of the second diaphragm. As such, sound may be emitted by both diaphragms from the same plane in space.

[0032] In an example, the first diaphragm is a wideband diaphragm (such as capable of generating sound within a frequency range of 200Hz to 20kHz), or a tweeter diaphragm (such as capable of generating sound within a frequency range of 1-2 kHz to 20 kHz), and the second diaphragm is a woofer diaphragm (such as capable of generating sound within a frequency range of 50 to 300 Hz).

[0033] In examples, the transducer assembly may further comprise a waveguide in fluid communication with the first diaphragm and configured to direct acoustic energy generated by the first diaphragm through the aperture. The waveguide may be axially aligned with a central axis of the second diaphragm. The waveguide may be a horn, for example.

[0034] The waveguide can provide improved directionality of the acoustic energy generated by the first diaphragm, allowing the energy / waves to travel more effectively towards a listener. The waveguide can therefore reduce attenuation.

[0035] As used herein, “in fluid communication” may mean that the diaphragm is acoustically coupled to the waveguide, such that acoustic energy generated by the diaphragm travels through / along the waveguide.

[0036] In certain examples, the second diaphragm defines a central axis, and the plurality of motors are arranged around the central axis. The central axis may be the centroidal axis for diaphragms with non-circular shapes. Arranging the motors around the central axis provides a more balanced / uniform driving force of the second diaphragm. In examples, the plurality of motors are equally spaced around the central axis. In other examples, two rows of motors may drive the second diaphragm.

[0037] In some examples, the central axis is (or is parallel to) a sound axis along which acoustic energy generated by the second diaphragm travel.

[0038] In some examples, the first diaphragm may be arranged along the central axis. In examples where a motor drives the first diaphragm, the motor and / or first diaphragm may be arranged along the central axis. The arrangement of the plurality of motors around the central axis may define a space between the motors, wherein the first diaphragm (and in some examples, one or more motors used to drive the first diaphragm) are located within the space.

[0039] In some arrangements, the plurality of motors comprise three or more motors, each motor comprising a voice coil and at least one magnetic element, and wherein the transducer assembly further comprises: three or more suspension systems, each suspension system associated with a motor and coupled to a respective voice coil of the motor, and a support assembly for transferring movement of the voice coils to the second diaphragm, the support assembly comprising three or more substantially straight connecting members, each of the connecting members extending between two suspension systems.

[0040] Having straight connecting members, rather than bent or curved connecting members, allows the connecting members to have a higher rigidity or stiffness. This allows the second diaphragm to generate higher frequency sound.

[0041] The substantially straight connecting members may be rigid and / or provide reinforcement to the second diaphragm.

[0042] In a particular example, there are exactly three motors for the second diaphragm (and in some cases exactly three suspension systems and connecting members). Having only three, rather than four or more motors, still allows straight connecting members, while minimizing the number of motors, which reduces the complexity, cost, size, and weight of the assembly.

[0043] In an example, the suspension systems and support assembly are integrally formed. which can further increase rigidity.

[0044] In examples, the transducer assembly may further comprise a single motor for driving the first diaphragm.

[0045] Having a single motor to drive the first diaphragm can limit the weight of the device, whilst also reducing the “width” occupied by the first diaphragm and motor, where the width is measured perpendicular to the central axis of the first diaphragm. This can allow the motor and first diaphragm to be contained within the aperture of the second diaphragm.

[0046] In an example, the single motor comprises a voice coil and a magnetic element. In an example, the magnetic element comprises a single magnet.

[0047] In examples, rather than having a plurality of motors driving the second diaphragm, a single motor may drive the second diaphragm.

[0048] In some examples, the single motor and the plurality7of motors at least partially overlap along a central axis of the second diaphragm. This “overlap” provides a lower profile transducer assembly compared to embodiments in which the motors are displaced along the axis.

[0049] In a particular example, the single motor and the plurality’ of motors are arranged in substantially the same plane. For example, the midpoints of each motor are aligned along the same plane, or more generally, at least part of each motor is arranged on the plane. The plane may be perpendicular to a central axis of the second diaphragm and / or a central axis of the first diaphragm. In some examples, the motors may be said to be coplanar.

[0050] In examples, the transducer assembly may further comprise one or more further diaphragms, wherein the second diaphragm further surrounds the one or more further diaphragms. For example, the first diaphragm and the one or more further diaphragms may be arranged within the aperture and together form an array of two or more diaphragms.

[0051] Having an array of two or more diaphragms arranged within the aperture can provide a richer sound profile when each diaphragm outputs audio having different frequencies and / orprovides a higher volume. In an example, the diaphragms forming the array are all tweeter diaphragms.

[0052] In examples, the transducer assembly may further comprise a third diaphragm displaced from the second diaphragm along an axis, and at least one motor for driving the third diaphragm, wherein the first diaphragm is configured to generate first acoustic energy, the second diaphragm is configured to generate second acoustic energy, and the third diaphragm is configured to generate third acoustic energy, wherein (in operation) the first and second acoustic energy' is directed away from the assembly in a direction opposite to the third acoustic energy.

[0053] As such, the second and third diaphragms may be said to be arranged back-to-back. This “back-to-back” configuration allows sound to be directed in different directions into a room, filling the room and / or providing a particular sound profile.

[0054] The axis along which the third and second diaphragms are displaced may be the central axis of the second diaphragm. In some examples, the third and second diaphragms are coaxial, but in other examples, they are parallel but offset from each other in a direction perpendicular to the axis.

[0055] The third diaphragm may also delimit an aperture, in certain examples.

[0056] In examples, the assembly may further comprise a fourth diaphragm, wherein the third diaphragm delimits an aperture and surrounds the fourth diaphragm. The fourth diaphragm is configured to generate fourth acoustic energy that is directed away from the assembly in the same direction as the third acoustic energy. In one particular case, the third and fourth diaphragms (and any associated motors) are arranged in the same manner as the first and second diaphragms (and any associated motors), but arranged to face in opposite directions.

[0057] In some examples, the at least one motor comprises a second plurality of motors for driving the third diaphragm and wherein the third diaphragm delimits an aperture and surrounds the first diaphragm.

[0058] This arrangement allows the second and third diaphragms to be positioned closer together, providing a lower profile assembly. For example, the second plurality of motors can be spaced around the axis such that the first diaphragm and / or a motor associated with the first diaphragm can be arranged in the space between the motors.

[0059] Again, in examples, “surrounds the first diaphragm'’ may mean that the third diaphragm has an outer radius or diameter (or cross-sectional width) that is greater than an outer radius or diameter (or cross-sectional width) of the first diaphragm and a central axis of the first diaphragm extends through the aperture defined by the third diaphragm.

[0060] In some examples, the central axis of the first diaphragm is either coaxial with a central axis of the third diaphragm or approximately coaxial with the central axis of the third diaphragm. In some examples, a radius / area of the aperture of the third diaphragm is greater than the outer radius / area of the first diaphragm.

[0061] In particular examples, the second and third diaphragms are substantially the same. For example, the second and third diaphragms may have the same size and / or same surface area. They may be configured to output audio within the same frequency range. This configuration ensures the sound produced by the second and third diaphragms is well balanced.

[0062] In some arrangements, the at least one motor comprises a second plurality of motors for driving the third diaphragm, and wherein the second plurality of motors: are arranged around the axis and are offset around the axis from the plurality of motors, and at least partially overlap the plurality of motors along the axis.

[0063] This overlapping arrangement allows the second and third diaphragms to be positioned closer together, providing a lower profile assembly.

[0064] In some cases, the third diaphragm defines a central axis and the second plurality of motors are arranged around the central axis of the third diaphragm.

[0065] In a particular example, the plurality of motors and the second plurality of motors are arranged in substantially the same plane. For example, the midpoints of each motor are aligned along the same plane, or more generally, at least part of each motor is arranged on the plane. The plane may be perpendicular to a central axis of the second diaphragm and / or a central axis of the third diaphragm.

[0066] Being offset around the axis means that each motor is arranged at a different azimuth angles around the axis.

[0067] As mentioned briefly above, according to a second aspect of the present invention, there is provided a transducer assembly, comprising: a first diaphragm, a second diaphragm delimiting an aperture, a waveguide in fluid communication with the first diaphragm and configured to direct acoustic energy' generated, transmitted, output, and / or propagated by the first diaphragm through the aperture, and a plurality of motors for driving the second diaphragm.

[0068] This arrangement of diaphragms and the waveguide allows the transducer assembly to have a smaller profile, and provides a more uniform sound profile, due to the acoustic energy of one diaphragm being output through the aperture of the other diaphragm. Having a plurality of motors driving the second diaphragm means that the assembly can have a lower profile. For example, a space between the plurality’ of motors can accommodate the first diaphragm and / or the waveguide. As mentioned, the waveguide allows the first and second diaphragms to be arranged in a different configuration compared to those in the first aspect. For example, rather than having the first diaphragm surrounded by the second diaphragm, the first diaphragm could be arranged under the second diaphragm or outside of the aperture of the second diaphragm or be tilted with respect to the second diaphragm, such that the central axes of each diaphragmare not parallel. The waveguide nevertheless allows sound to be channeled from the first diaphragm through the aperture, as if the first diaphragm was effectively surrounded by the second diaphragm.

[0069] However, in some examples of this second aspect, the second diaphragm may nevertheless surround the first diaphragm, as will be apparent from the disclosure below. As such, in one example, the second diaphragm surrounds the first diaphragm. In examples, the assembly may further comprise one or more further diaphragms, wherein the second diaphragm surrounds the one or more further diaphragms. The transducer assembly may comprise any or all of the components of the transducer assembly defined in the first aspect above.

[0070] In some examples, the first diaphragm has a first sound axis, the second diaphragm has a second sound axis, and the first sound axis and the second sound axis are at least one of: offset or not parallel.

[0071] This arrangement may be useful if components in the playback device mean that the first and second diaphragms cannot be arranged to point in the same direction. The waveguide can therefore direct acoustic energy from the first diaphragm through the aperture of the second diaphragm. In one particular case, the first sound axis does not pass through the aperture.

[0072] The first sound axis may be (or be parallel to) a central axis of the first diaphragm, in some examples. Similarly, the second sound axis may be (or be parallel to) a central axis of the second diaphragm, in some examples.

[0073] In another arrangement, the first and second sound axes are both offset and parallel.

[0074] In particular arrangements, the second diaphragm defines a central axis and the plurality of motors are arranged around the central axis.

[0075] In some examples, the plurality of motors comprises three or more motors, each motor comprising a voice coil and a magnetic element, and wherein the transducer assembly further comprises: three or more suspension systems, each suspension system associated with a motorand coupled to a respective voice coil of the motor, and a support assembly for transferring movement of the voice coils to the second diaphragm, the support assembly comprising three or more substantially straight connecting members, each of the connecting members extending between two suspension systems.

[0076] In examples, the transducer assembly may further comprise a single motor for driving the first diaphragm. In some cases, the single motor and the plurality of motors at least partially overlap along a central axis of the second diaphragm.

[0077] In certain arrangements, the transducer assembly further comprises: a third diaphragm displaced from the second diaphragm along an axis, and at least one motor for driving the third diaphragm, wherein the first diaphragm is configured to generate first acoustic energy, the second diaphragm is configured to generate second acoustic energy, and the third diaphragm is configured to generate third acoustic energy', wherein the first and second acoustic energy is directed away from the assembly in a direction opposite to the third acoustic energy.

[0078] In some examples, the third diaphragm defines or delimits an aperture. In some cases, the second and third diaphragms are substantially the same.

[0079] In examples, the at least one motor comprises a second plurality of motors for driving the third diaphragm and wherein the third diaphragm delimits an aperture.

[0080] This arrangement allows the second and third diaphragms to be positioned closer together, providing a lower profile assembly. For example, the second plurality of motors can be spaced around an axis such that they can locate the waveguide and / or the first diaphragm and / or a motor associated with the first diaphragm in the space between the motors.

[0081] In an example, the third diaphragm surrounds the first diaphragm.

[0082] In certain examples, the at least one motor compnses a second plurality of motors for driving the third diaphragm, and wherein the second plurality of motors: are arranged aroundthe axis and are offset around the axis from the plurality of motors, and at least partially overlap the plurality of motors along the axis.

[0083] In some examples, the assembly further comprises a further diaphragm delimiting an aperture that surrounds both the first diaphragm and the second diaphragm. For example, the first diaphragm may be a tweeter diaphragm, the second diaphragm may be a midwoofer diaphragm, and the further diaphragm may be a woofer diaphragm. All three diaphragms mayoutput sound in the same direction. One or more of the diaphragms may be annular or elliptical (for example, "racetrack" shaped).

[0084] According to a third aspect of the invention, there is provided a playback device comprising: a transducer assembly comprising: a first diaphragm, a second diaphragm delimiting an aperture and a plurality of motors for driving the second diaphragm, wherein the second diaphragm at least one of: (i) surrounds the first diaphragm, or (ii) is arranged such that acoustic energy generated by the first diaphragm are directed through the aperture via a waveguide that is in fluid communication with the first diaphragm.

[0085] In an example, the playback device further comprises the waveguide.

[0086] In a further aspect, there is provided a playback device comprising: the transducer assembly as defined in the first or second aspects.

[0087] According to a further aspect of the invention, there is provided a system, comprising: (i) a first playback device and a second playback device. One, or both, of the first and second playback devices may be a playback device as described in the third aspect.

[0088] The system may further comprise a controller configured to send an instruction to the first and / or second playback device to cause the first and / or second playback device to play back audio.

[0089] In some examples, rather than having a diaphragm arranged within the aperture. electronic components may be arranged within the aperture. Alternatively, no components maybe arranged within the aperture, the space instead acting as a design feature. The aperture may act as ventilation for the voice coil(s) of the motor(s). In one example, a heatsink is arranged in the aperture.

[0090] While some examples described herein may refer to functions performed by given actors such as “users,” “listeners,” and / or other entities, it should be understood that this is for purposes of explanation only. The claims should not be interpreted to require action by any such example actor unless explicitly required by the language of the claims themselves.

[0091] In the Figures, identical reference numbers identify generally similar, and / or identical, elements. To facilitate the discussion of any particular element, the most significant digit or digits of a reference number refers to the Figure in which that element is first introduced. Many of the details, dimensions, angles and other features show n in the Figures are merely illustrative of particular embodiments of the disclosed technology. Accordingly, other embodiments can have other details, dimensions, angles and features without departing from the spirit or scope of the disclosure. In addition, those of ordinary skill in the art will appreciate that further embodiments of the various disclosed technologies can be practiced without several of the details described below .II. Example Playback Device(s)

[0092] Figure 1 is a functional block diagram illustrating certain aspects of an example playback device 100. The playback device 100 is configured to output audio via one or more drivers 114 into a playback environment in which the playback device is located (such as a room or outdoors). A driver may be known as a speaker driver and / or a transducer, in some cases. The, or each, driver 114, comprises a diaphragm and one or more motors to drive the diaphragm. As shown, the playback device 100 includes various components, each of which is discussed in further detail below, and the various components of the playback device 100 maybe operably coupled to one another via a system bus, communication network, or some other connection mechanism.

[0093] As shown, the playback device 100 includes at least one processor 102, which may be a clock-driven computing component configured to process input data according to instructions stored in memory7104. The memory 104 may be a tangible, non-transitory. computer-readable medium configured to store instructions that are executable by the one or more processors 102. For example, the memory7104 may be data storage that can be loaded with software code 106 that is executable by the one or more processors 102 to achieve certain functions.

[0094] In one example, these functions may involve the playback device 100 retrieving audio data from an audio source, which may be another playback device or another device, such as a user device or a remote server. In another example, the functions may involve the playback device 100 sending audio data, detected-sound data (e.g., corresponding to a voice input), and / or other information to another device on a network via at least one network interface 120. In yet another example, the functions may involve the playback device 100 causing one or more other playback devices to synchronously play back audio with the playback device 100. For example, the playback device 100 may be in a group with one or more other playback devices, where devices in the group play back audio in synchrony. In yet a further example, the functions may involve the playback device 100 facilitating being grouped (such as paired or otherwise bonded) with one or more other playback devices to create a multi-channel audio environment. Numerous other example functions are possible, some of which are discussed below.

[0095] As just mentioned, certain functions may involve the playback device 100 synchronizing playback of audio content with one or more other playback devices. During synchronous playback, a listener may not perceive time-delay differences between playback ofthe audio content by the synchronized playback devices. U.S. Patent No. 8.234,395 filed on April 4, 2004, and titled “System and method for synchronizing operations among a plurality of independently clocked digital data processing devices,” which is hereby incorporated by reference in its entirety, provides in more detail some examples for audio playback synchronization among playback devices.

[0096] To facilitate audio playback, the playback device 100 includes audio processing components 110 that are generally configured to process audio prior to the playback device 100 rendering the audio. In this respect, the audio processing components 110 may include one or more digital-to-analog converters (“DAC”), one or more audio preprocessing components, one or more audio enhancement components, one or more digital signal processors (“DSPs”), and so on. In some implementations, one or more of the audio processing components 110 may be a subcomponent of the processor 102. In operation, the audio processing components 110 receive analog and / or digital audio and process and / or otherwise intentionally alter the audio to produce audio signals for playback.

[0097] The produced audio signals may then be provided to one or more audio amplifiers 112 for amplification and playback through one or more drivers / transducers 114 operably coupled to the one or more amplifiers 112. The one or more audio amplifiers 112 may include components configured to amplify audio signals to a level for driving one or more of the drivers 114.

[0098] A driver 114 may be, for example, a subwoofer (e.g., for low frequencies), a midrange driver (e.g., for middle frequencies), or a tweeter (e.g., for high frequencies). In some cases, a driver 114 may be driven by an individual corresponding audio amplifier of the one or more audio amplifiers 112.

[0099] In addition to producing audio signals for playback by the playback device 100. the audio processing components 110 may be configured to process audio to be sent to one or moreother playback devices, via the network interface 120, for playback. In example scenarios, audio content to be processed and / or played back by the playback device 100 may be received from an external source, such as via an audio line-in interface (e.g., an auto-detecting 3.5mm audio line-in connection) of the playback device 100 (not shown) or via the network interface 120, as described below.

[0100] As show n, the at least one network interface 120, may take the form of one or more wireless interfaces 122 and / or one or more wired interfaces 124. A wireless interface may provide network interface functions for the playback device 100 to wirelessly communicate with other devices (e.g., other playback device(s), and / or controller / user device(s)) in accordance with a communication protocol (e.g., any wireless standard including IEEE 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac, 802.15, 4G mobile communication standard, and so on). A wired interface may provide network interface functions for the playback device 100 to communicate over a wired connection with other devices in accordance with a communication protocol (e.g., IEEE 802.3). While the network interface 120 shown in Figure 1 includes both wired and wireless interfaces, the playback device 100 may in some implementations include only wireless interface(s) or only wired interface(s).

[0101] In general, the network interface 120 facilitates data flow between the playback device 100 and one or more other devices on a data network. For instance, the playback device 100 may be configured to receive audio content over the data network from one or more other playback devices, network devices within a LAN, and / or audio content sources over a WAN, such as the Internet. In one example, the audio content and other signals transmitted and received by the playback device 100 may be transmitted in the form of digital packet data comprising an Internet Protocol (IP)-based source address and IP-based destination addresses.In such a case, the network interface 120 may be configured to parse the digital packet datasuch that the data destined for the playback device 100 is properly received and processed by the playback device 100.

[0102] As shown in Figure 1, the playback device 100 also includes voice processing components 116 that are operably coupled to one or more microphones 118. The microphones 118 are configured to detect sound (i.e., acoustic energy or acoustic waves) in the environment of the playback device 100, which is then provided to the voice processing components 116. More specifically, each microphone 118 is configured to detect sound and convert the sound into a digital or analog signal representative of the detected sound, which can then cause the voice processing component 116 to perform various functions based on the detected sound. For example, the playback device 100 may obtain and then play back certain audio content based on a voice input from a user to play that audio content. In another example, the playback device may reconfigure itself based on a voice input from a user. In one implementation, the microphones 118 are arranged as an array of microphones (e.g., an array of six microphones). In some implementations, the playback device 100 includes more than six microphones (e.g., eight microphones or twelve microphones) or fewer than six microphones (e.g., four microphones, two microphones, or a single microphone).

[0103] In operation, the voice-processing components 116 are generally configured to detect and process sound received via the microphones 118, identify potential voice input in the detected sound, and extract detected-sound data to enable a Voice Assistant Service (VAS) to process voice input identified in the detected-sound data. The voice processing components 116 may include one or more analog-to-digital converters, an acoustic echo canceller (“AEC”), a spatial processor (e.g., one or more multi-channel Wiener filters, one or more other filters, and / or one or more beam former components), one or more buffers (e.g., one or more circular buffers), one or more wake-word engines, one or more voice extractors, and / or one or more speech processing components (e.g., components configured to recognize a voice of aparticular user or a particular set of users associated with a household), among other example voice processing components. In some implementations, one or more of the voice processing components 116 may be a subcomponent of the processor 102.

[0104] As further shown in Figure 1, the playback device 100 also includes power components 126. The power components 126 include at least an external power source interface 128, which may be coupled to a pow er source (not shown) via a pow er cable or the like that physically connects the playback device 100 to an electrical outlet or some other external power source. Other power components may include, for example, transformers, converters, and like components configured to format electrical pow er.

[0105] In some implementations, the power components 126 of the playback device 100 may additionally include an internal power source 130 (e.g., one or more batteries) configured to powder the playback device 100 without a physical connection to an external powder source. When equipped with the internal power source 130, the playback device 100 may operate independent of an external powder source. In some such implementations, the external powder source interface 128 may be configured to facilitate charging the internal pow er source 130. In some examples, the external power source interface receives power via utility or wall power, or perhaps an external batten- configured to charge other devices. In certain examples, the external power source interface is configured to receive power from an energy harvesting device (not shown) configured to generate electricity from an energy source (e.g., solar, wind, heat). A playback device comprising an internal power source may be referred to herein as a “portable playback device.”

[0106] The playback device 100 further includes a user interface 108 that may facilitate user interactions independent of or in conjunction with user interactions facilitated by one or more controller / user devices. An example controller device may be. for example, a mobile telephone. a PC, a tablet computer, etc. Controller devices may have installed thereon an applicationconfigured to control one or more playback devices in a playback system. In various embodiments, the user interface 108 includes one or more physical buttons and / or supports graphical interfaces provided on touch sensitive screen(s) and / or surface(s), among other possibilities, for a user to directly provide input. The user interface 108 may further include one or more of lights (e.g., LEDs) and the speakers to provide visual and / or audio feedback to a user. Via the user interface 108 and / or a controller device, the user can control various operations of the playback device 100, such as instructing and controlling playback of audio content, and / or configuring the playback device 100.

[0107] By way of illustration, SONOS, Inc. presently offers (or has offered) for sale certain playback devices that may implement certain of the embodiments disclosed herein, including a “PLAY: 1,” “PLAY:3,” “PLAY:5,” “PLAYBAR,” “CONNECT: AMP,” “PLAYBASE,” “BEAM,” “CONNECT,” and “SUB.” Any other past, present, and / or future playback devices may additionally or alternatively be used to implement the playback devices of example embodiments disclosed herein. Additionally, it should be understood that a playback device is not limited to the example illustrated in Figures 1 or to the SONOS product offerings. For example, a playback device may include, or otherwise take the form of, a wired or wireless headphone set, which may operate as a part of a playback system via a network interface or the like. In another example, a playback device may include or interact with a docking station for personal mobile media playback devices. In yet another example, a playback device may be integral to another device or component such as a television, a lighting fixture, or some other device for indoor or outdoor use.

[0108] It will be appreciated that one or more components illustrated in Figure 1 are optional, and may be omitted from a playback device. In its simplest form, a playback device 100 may comprise one or more processors 102. memory 104 storing instructions, and one or more drivers 114.

[0109] Figure 2A is an isometric schematic view depicting an example transducer assembly 200 comprising a first diaphragm 202 (or membrane or cone), a second diaphragm 204 (or membrane), and a plurality of motors 206 for driving the second diaphragm 204. Such a transducer assembly 200 may be incorporated into the playback device 100 (or another suitable device), in addition to any or all of the components discussed in relation to Figure 1.

[0110] As shown in Figure 2A, the second diaphragm 204 defines / delimits / comprises an aperture 208 such that the second diaphragm 204 is annular or has a ‘‘ring” shape. In this example, the first diaphragm 202 is arranged within the aperture 208 such that the second diaphragm 204 surrounds the first diaphragm 202. The second diaphragm 204 has an outer diameter 210 that is greater than an outer diameter 212 of the first diaphragm 202, and a central axis 214 of the first diaphragm 202 extends through the aperture 208 defined by the second diaphragm. Figure 2A also depicts a central axis 216 of the second diaphragm 204 aligned with and / or overlaying the central axis 214 of the first diaphragm 202. As such, both axes 214, 216 are coaxial. In other examples, the axes 214, 216 are not coaxial (so are radially offset), but may nevertheless be parallel. As will become apparent, in still further examples, the axes 214, 216 may not be parallel.

[0111] Figure 2B is a plan view of the transducer assembly 200 as viewed along the central axes 214, 216 and arrow A. Figure 2B most clearly depicts the second diaphragm 204 surrounding the first diaphragm 202.

[0112] It will be appreciated that although the first and second diaphragms 202, 204 are illustrated as being generally ‘'flat”, they can take any form. Similarly, although the first and second diaphragms 202, 204 are illustrated as having a circular shape, they may have any other shape. For example, the first diaphragm may be square and the second diaphragm may be square. In another example, the first diaphragm may be square and the second diaphragm may be annular, or vice versa. In another example, the first diaphragm may be annular and thesecond diaphragm may be elliptical (for example, having a “racetrack"’ shape), or vice versa. Annular diaphragms may be easier to simulate. Square diaphragms may be useful to provide more surface area for the same space within the assembly. In one example, the first diaphragm is a diaphragm of an air motion tweeter.

[0113] Each motor 206 of the plurality of motors 206 comprises a voice coil contained within a voice coil enclosure 206a, and a magnetic element 206b. As shown, the voice coil enclosures 206a of each motor 206 are coupled to a support assembly which comprises one or more connecting members 220a, 220b, 220c. The support assembly and therefore the connecting members 220a-c connect the motors 206 together to provide a rigid support structure. The support assembly couples to, and supports, the second diaphragm 204.

[0114] When a current is passed through the voice coils, the interaction of the magnetic fields generated by the voice coils with the magnetic elements 206b causes the voice coils, and therefore the voice coil enclosures 206a, to be displaced relative to the magnetic elements 206b. Movement of the voice coil enclosures 206a causes the support assembly to move, which in turn transfers movement to the second diaphragm 204. Movement of the second diaphragm 204 causes the second diaphragm 204 to generate acoustic energy 222, such as an acoustic wave or waves, that generally travels away from the second diaphragm 204 in a first direction.

[0115] In the particular example shown, there are three motors 206 for driving the second diaphragm 204, and the motors 206 are spaced around the central axis 216 of the second diaphragm 204. As is most clearly visible in Figure 2B, the plurality of motors 206 are equally spaced around the central axis 216 of the second diaphragm 204 (and also the central axis 214 of the first diaphragm 202) leaving a space for the first diaphragm 202 to be located. Although the motors 206 are depicted as “outside” of the second diaphragm 204, it will be appreciated that in other examples, the plurality of motors 206 may be positioned under the second diaphragm or within the aperture 208 (such that the second diaphragm 204 also surrounds theplurality of motors 206). The triangular arrangement of the plurality of motors 206 allows substantially straight connecting members 220a-c to extend between the motors 206. Each motor 206 is therefore connected to one motor 206 via a first connecting member 220a-c and a further motor 206 via second connecting member 220a-c. Patent publication WO2018 / 056814 (filed on 21 September 2017 and titled “Loudspeaker Unit with Multiple Drive Units”) and WO2019 / 086357 (filed on 26 October 2018 and titled “Low Profile Loudspeaker Device”), which are hereby incorporated by reference in their entirety, describe some example loudspeaker devices.

[0116] The transducer assembly 200 of this example further comprises a single motor 218 for driving the first diaphragm 202. In other examples however, there may be zero motors, or more than one motor, associated with the first diaphragm 202. For example, the first diaphragm 202 may be a passive radiator (if it has zero motors). In a similar way to the second diaphragm 204, when the first diaphragm 202 is displaced / driven (for example, by the single motor 218), the first diaphragm 202 generates acoustic energy 224 that generally travels away from the first diaphragm 202 in the same direction as the acoustic energy 222 generated by the second diaphragm 204. In Figure 2B, the acoustic energy 222, 224 travels out of the page.

[0117] In the example of Figures 2A and 2B, the motor 218 and the plurality of motors 206 at least partially overlap along the central axis 216 of the second diaphragm 204. For example, at least part of each motor 218, 206 is arranged on a plane that is perpendicular to the central axis 216. In this example, the plane passes through a midpoint of the voice coil enclosures 206a.

[0118] In the example of Figures 2A and 2B, the first diaphragm 202 is arranged behind a plane / surface defined by the second diaphragm 204, such that the acoustic energy 224 generated by the first diaphragm passes through the aperture 208. In other examples, the first diaphragm 202 may be positioned in front of (or in line with) the plane or surface defined bythe second diaphragm 204, such that the acoustic energy 224 generated by the first diaphragm does not pass through the aperture 208.

[0119] In some examples, the transducer assembly 200 may further comprise a waveguide 326 arranged near to (or coupled to) the first diaphragm 202 such that the acoustic energy 224 generated by the first diaphragm 202 are directed through and travel along the waveguide 326. An example waveguide 326 is depicted in Figure 3, which is a plan view of a transducer assembly 300, which is similar to the transducer assembly 200 viewed along arrow A (Figure 2A). The waveguide 326 may be funnel shaped or tapered, with a wider part of the waveguide 326 being arranged further away from the first diaphragm 202 than a narrower part of the waveguide 326. The acoustic energy 224 (Figure 2A) therefore travels along the waveguide 326 from the narrower part to the wider part. In cases where the first diaphragm 202 is arranged behind a plane or surface defined by the second diaphragm 204, the waveguide 326 can channel the acoustic energy' 224 generated by the first diaphragm 202 through the aperture. As such, in particular examples, the waveguide 326 can extend through the aperture. For example, the narrower part of the waveguide 326 may be arranged on one side of the second diaphragm 204 and the wider part of the waveguide 326 may be arranged on the other side of the second diaphragm 204.

[0120] In a variation on the example depicted in Figures 2A-3, rather than having just one diaphragm arranged to be surrounded by the second diaphragm 204, there may be two or more diaphragms positioned within the aperture 208. For example, there may be two or more tweeters forming a tweeter array.

[0121] In some examples, the transducer assembly components depicted in Figures 2A-3 may be positioned back-to-back with identical (or similar) components to provide a transducer assembly that can output sound in opposing directions.

[0122] Figure 4 for example is an underside plan view of a transducer assembly 400 corresponding to a view along arrow B of Figure 2A, where the acoustic energy 222, 224 generated by the first and second diaphragms 202, 204 travels into the page. The transducer assembly 400 includes a third diaphragm 404 arranged behind the second diaphragm 204 and a fourth diaphragm 402 arranged behind the first diaphragm 202. The third diaphragm 404 is displaced from the second diaphragm 204 along an axis (such as the central axis 216 of the second diaphragm 204 and / or the central axis 214 of the first diaphragm 202). Similarly, the fourth diaphragm 402 is displaced from the second diaphragm 204 along an axis (such as the central axis 216 of the second diaphragm 204 and / or the central axis 214 of the first diaphragm 202). A central axis of the third diaphragm 404 may be coaxial with the central axis 216 of the second diaphragm 204. Similarly, a central axis of the fourth diaphragm 402 may be coaxial with the central axis 214 of the first diaphragm 202.

[0123] In this particular example, as with the second diaphragm 204, the third diaphragm 404 delimits an aperture 408 and surrounds the first (and fourth) diaphragms 202, 402. In this example, the second and third diaphragms 204, 404 are the same / identical, and therefore have the same dimensions. In other examples however, the third diaphragm 404 may not comprise an aperture. In some examples, the third or fourth diaphragms 402, 404 are omitted from the transducer assembly 400.

[0124] In the example of Figure 4, the transducer assembly 400 further comprises at least one motor 406 for driving the third diaphragm 404. In this particular example, there are a second plurality of motors 406 for driving the third diaphragm 404, such as the same number of motors for driving the second diaphragm 204. In other examples, the number of motors for driving the third diaphragm differs to the number of motors for driving the second diaphragm.

[0125] Each motor 406 of the plurality of motors 406 comprises a voice coil contained within a voice coil enclosure 406a, and a magnetic element 406b. As shown, the voice coil enclosures406a of each motor 406 are coupled to a support assembly which comprises one or more connecting members 420a, 420b, 420c. The support assembly and therefore the connecting members 420a-c connect the motors 406 together to provide a rigid support structure. The support assembly couples to, and supports, the third diaphragm 404.

[0126] As discussed above in relation to the second diaphragm 204, movement of the voice coil enclosures 406a causes the support assembly to move, which in turn transfers movement to the third diaphragm 404. Movement of the third diaphragm 404 causes the third diaphragm 404 to generate third acoustic energy that generally travels away from the third diaphragm 404 in a second direction, opposite to the first direction. As such, the first and second acoustic energy 224, 222 generated by the first and second diaphragms 202, 204, is directed away from the assembly 400 in a direction opposite to the third acoustic energy.

[0127] In the particular example shown, there are three motors 406 for driving the third diaphragm 404, and the motors 406 are spaced around the central axis of the third diaphragm 404. As shown in Figure 4, the plurality of motors 406 are equally spaced around the central axis of the third diaphragm 404 leaving a space for the first 202 diaphragm and / or fourth diaphragm 402 to be located. Although the motors 406 are depicted as ‘’outside” of the third diaphragm 404, it will be appreciated that in other examples, the plurality of motors 406 may be positioned ‘’under” (e.g., radially overlapping) the third diaphragm or within the aperture 408 (such that the third diaphragm 404 also surrounds the plurality of motors 406).

[0128] The transducer assembly 400 of this example further comprises a single motor (not visible) for driving the fourth diaphragm 402. In other examples, however, there may be zero motors, or more than one motor, associated with the fourth diaphragm 402. For example, the fourth diaphragm 402 may be a passive radiator. In a similar way to the third diaphragm 404, when the fourth diaphragm 402 is displaced / driven (for example, by the single motor), the fourth diaphragm 402 generates or outputs acoustic energy that generally propagates or travelaway from the fourth diaphragm 402 in the same direction as the acoustic energy output or generated by the third diaphragm 404. In the illustrated example of Figure 4. for instance, the acoustic energy generated by the third and fourth diaphragms travels out of the page.

[0129] In the example of Figure 4, the motor for driving the fourth diaphragm 402 (if present) and the second plurality of motors 406 at least partially overlap along the central axis of the third diaphragm 404. For example, at least part of the motor and the second plurality of motors 406 are arranged on a plane that is perpendicular to the central axis of the third diaphragm 404. In this example, the plane passes through a midpoint of the voice coil enclosures 406a.

[0130] Similarly, to reduce the overall profde of the transducer assembly 400, the second plurality of motors 406 are offset around an axis (such as the central axis of the first, second, third and / or fourth diaphragms) from the plurality of motors 206 and at least partially overlap the plurality of motors 206 along the axis. This arrangement allows the second and third diaphragms to be arranged closer together. For example, at least part of each motor 206, 406 is arranged on a plane that is perpendicular to the axis. In this example, the plane passes through a midpoint of the voice coil enclosures 206a, 406a. Figure 4 shows the offset of the motors 206, 406 around the axis.

[0131] In the example of Figure 4, the fourth diaphragm 402 is arranged behind a plane / surface defined by the third diaphragm 404, such that the acoustic energy generated by the fourth diaphragm passes through the aperture 408. In other examples, the fourth diaphragm 402 may be positioned in front of (or in line with) the plane / surface defined by the third diaphragm 404, such that the acoustic energy generated by the fourth diaphragm does not pass through the aperture 408.

[0132] In some examples, the transducer assembly 400 may further comprise a waveguide arranged near to (or coupled to) the fourth diaphragm 402 such that the acoustic energy generated by the fourth diaphragm 402 are directed through and travel along the waveguide.

[0133] Figure 5A is a perspective view of a transducer assembly 500, which can include similar features as the transducer assemblies 200, 300, and 400, etc. described above with respect to corresponding Figures 2A-4. In this example, a frame 528 comprises a first frame part 528a connected to a second frame part 528b. In the illustrated example of Figure 5 A, the first and second frame parts 528a, 528b are configured to be separable. In other examples, however, the first and second frame parts 528a, 528b are integrally formed, and may not be separable.

[0134] The first frame part 528a houses a first part of the transducer assembly, and the second frame part 528b houses a second part of the transducer assembly. The first part of the transducer assembly comprises the first diaphragm 202, the second diaphragm 204, the motor 218 for driving the first diaphragm 202, the plurality of motors 206, and the support assembly comprising the connecting members 220a-c (in addition to any further components that are associated with the first and second diaphragms 202, 204). The second part of the transducer assembly comprises the third diaphragm 404, the fourth diaphragm 402, the motor for driving the fourth diaphragm 402, the second plurality of motors 406, and the support assembly (in addition to any further components that are associated with the third and fourth diaphragms 402, 404).

[0135] Figure 5B depicts a perspective view of the first frame part 528a and the second diaphragm 204. The first diaphragm 202 is omitted to show the aperture 208 through the second diaphragm 204. Figure 5C depicts the view of Figure 5B, with the first frame part shown partially transparent. As shown in Figure 5C, the transducer assembly 500 (and in particular the first part of transducer assembly) additionally comprises a plurality of suspension systems 530, where each suspension system 530 is coupled to: the frame 528 (in particular the first frame part 528a) via a connector 532, and to the support assembly (where the support assembly comprises the connecting members 220a-c). In the example of Figure 5C, each suspensionsystem 530 is connected to the support assembly via the voice coil enclosures 206a. In some cases, the voice coil enclosure 206a may form a part of the suspension system 530. Each suspension system 530 may therefore be connected to the voice coil of a motor via the voice coil enclosures 206a. When the voice coils are displaced, the support assembly moves relative to the frame 528, and the movement is facilitated by the connection of the suspension systems 530 to the frame.

[0136] In this particular case, each motor 206 of the plurality of motors is associated with a separate suspension system 530. As such, there are also three suspension systems 530. The suspension systems 530 may be referred to as spiders or as speaker dampers.

[0137] As shown in Figure 5C, the support assembly may comprise other components in addition to the connecting members 220a-c.

[0138] It will be appreciated that the components depicted within Figure 5C may also be found housed within the second frame part 528b. For example, there may be a second plurality of suspension systems 530 corresponding to the second plurality of motors 406 for driving the third diaphragm 404. Furthermore, any components depicted in Figures 5A-5C may be contained within the transducer assembly depicted in Figures 2A-4.

[0139] As briefly mentioned above, in a second aspect of the present disclosure, the second (and / or third) diaphragm may not necessarily surround the first (and / or fourth) diaphragm, and instead, a waveguide can channel / direct sound from the first (and / or fourth) diaphragm through the aperture of the second (and / or third) diaphragm.

[0140] As such, Figures 6 A and 6B are isometric and top plan view's, respectively, of a transducer assembly 600 that includes a first diaphragm 602 and motor 618 aligned with a center axis 614. In the illustrated example, the first diaphragm 602 is not surrounded by the second diaphragm 204, but is arranged in a different position and / or orientation. For example. rather than being located within the aperture 208 and facing in the same general direction asthe second diaphragm 204 as described with respect to Figures 2A-3, the first diaphragm 602 can instead be arranged under / over the second diaphragm 204 and / or outside of the second diaphragm 204 and / or be tilted with respect to the second diaphragm 204, such that the central axes of each diaphragm are not parallel.

[0141] For brevity, some of the same reference numerals as used in Figures 2A-5C are used in Figures 6A and 6B, and corresponding features will not be discussed in detail again. Similar to the transducer assemblies discussed above (e.g., the transducer assemblies 200, 300, 400, 500), the transducer assembly 600 can also comprise a plurality' of motors 206 for driving the second diaphragm 204. Figure 6A shows a perspective view of the transducer assembly 600, and Figure 6B shows a plan view of the transducer assembly 600 as viewed along the arrow C.

[0142] In this example, the central axis 614 of the first diaphragm 202 (also know n as a first sound axis) is offset from, and is not parallel with, the central axis 216 of the second diaphragm 204 (also known as a second sound axis). For example, a central axis 614 of the first diaphragm 602 is rotated by 90 degrees with respect to the central axis 216 of the second diaphragm 204. In other examples, the angle between the central axis 614 and central axis 216 is another suitable angle (e.g., 45 degrees, 180 degrees, 270 degrees, or another angle such as an oblique angle).

[0143] Accordingly, without a waveguide, the acoustic energy generated by the first diaphragm 202 that are output along the central axis 214 would not necessarily pass through the aperture of the second diaphragm 204. As such, to ensure that the acoustic energy from each diaphragm is output from the same general location or point in space (and thus directed in the same general direction), a waveguide 626 in fluid communication with the first diaphragm 602 is arranged to direct the acoustic energy 624 generated by the first diaphragm 602 toward or through the aperture 208. The waveguide 626 extends from the first diaphragm602 at least partially aligned with the central axis 614 and through the aperture 208. Althoughthe waveguide 626 is not shown in Figure 6A (to allow the other features of the assembly 300 to be seen more clearly), the acoustic energy 624 is shown following a path defined by the waveguide. For example, the acoustic energy 624 follows a non-linear path. As a result of the waveguide 626, both the acoustic energy 624 generated by the first diaphragm 602 and the acoustic energy 222 generated by the second diaphragm 204 travels away from the assembly 600 in the same general direction (e.g., out of the page in Figure 6B).

[0144] One of ordinary skill in the art will appreciate that any or all of the features discussed in relation to Figures 1-5C may additionally be incorporated into the transducer assembly 600 of Figures 6A and 6B. For example, the components of the transducer assembly 600 may be positioned back-to-back with identical (or similar) components to provide a transducer assembly 300 that can output sound in opposing directions. In a particular case, the components illustrated in Figures 2A-3 may be positioned back-to-back with the components illustrated in Figures 6A and 6B.

[0145] The description above discloses, among other things, various example transducer devices. It is understood that such examples are merely illustrative and should not be considered as limiting.

[0146] Additionally, references herein to ‘'embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one example embodiment of an invention. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. As such, the embodiments described herein, explicitly and implicitly understood by one skilled in the art, can be combined with other embodiments.

[0147] The specification is presented largely in terms of illustrative environments, systems. procedures, steps, logic blocks, processing, and other symbolic representations that directly orindirectly resemble the operations of data processing devices coupled to networks. These process descriptions and representations are typically used by those skilled in the art to most effectively convey the substance of their work to others skilled in the art. Numerous specific details are set forth to provide a thorough understanding of the present disclosure. How ever, it is understood to those skilled in the art that certain embodiments of the present disclosure can be practiced without certain, specific details. In other instances, well known methods, procedures, components, and circuitry have not been described in detail to avoid unnecessarily obscuring aspects of the embodiments. Accordingly, the scope of the present disclosure is defined by the appended claims rather than the foregoing description of embodiments.

[0148] When any of the appended claims are read to cover a purely software and / or firmw are implementation, at least one of the elements in at least one example is hereby expressly defined to include a tangible, non-transitory medium such as a memory, DVD, CD, Blu-ray, and so on, storing the softw are and / or firmware.

Claims

CLAIMS1. A transducer assembly, comprising: a first diaphragm; a second diaphragm; and a plurality of motors for driving the second diaphragm, wherein the second diaphragm delimits an aperture and surrounds the first diaphragm.

2. The transducer assembly of claim 1, further comprising a waveguide in fluid communication with the first diaphragm and configured to direct acoustic energy generated by the first diaphragm through the aperture.

3. The transducer assembly of claims 1 or 2, wherein the second diaphragm defines a central axis and the plurality of motors are arranged around the central axis.

4. The transducer assembly of any preceding claim, wherein the plurality7of motors comprises three or more motors, each motor comprising a voice coil and at least one magnetic element, and wherein the transducer assembly further comprises: three or more suspension systems, each suspension system associated with a motor and coupled to a respective voice coil of the motor; and a support assembly for transferring movement of the voice coils to the second diaphragm, the support assembly comprising three or more substantially straight connecting members, each of the connecting members extending between two suspension systems.

5. The transducer assembly of any preceding claim, further comprising a single motor for driving the first diaphragm.

6. The transducer assembly of claim 5, wherein the single motor and the plurality of motors at least partially overlap along a central axis of the second diaphragm.

7. The transducer assembly of any preceding claim, further comprising one or more further diaphragms, wherein the second diaphragm further surrounds the one or more further diaphragms.

8. The transducer assembly of any preceding claim, further comprising: a third diaphragm displaced from the second diaphragm along an axis; and at least one motor for driving the third diaphragm, wherein the first diaphragm is configured to generate first acoustic energy, the second diaphragm is configured to generate second acoustic energy, and the third diaphragm is configured to generate third acoustic energy, wherein the first and second acoustic energy is directed away from the assembly in a direction opposite to the third acoustic energy.

9. The transducer assembly of claim 8, wherein the at least one motor comprises a second plurality of motors for driving the third diaphragm and wherein the third diaphragm delimits an aperture and surrounds the first diaphragm.

10. The transducer assembly of claim 8 or 9, wherein the second and third diaphragms are substantially the same.

11. The transducer assembly of any of claims 8 to 10, wherein the at least one motor comprises a second plurality of motors for driving the third diaphragm, and wherein the second plurality of motors: are arranged around the axis and are offset around the axis from the plurality of motors; and at least partially overlap the plurality of motors along the axis.

12. A transducer assembly, comprising: a first diaphragm; a second diaphragm delimiting an aperture; a waveguide in fluid communication with the first diaphragm and configured to direct acoustic energy generated by the first diaphragm through the aperture: and a plurality of motors for driving the second diaphragm.

13. The transducer assembly of claim 12, wherein: the first diaphragm has a first sound axis; the second diaphragm has a second sound axis; and the first sound axis and the second sound axis are at least one of: offset or not parallel.

14. The transducer assembly of claims 12 or 13. wherein the second diaphragm defines a central axis and the plurality of motors are arranged around the central axis.

15. The transducer assembly of any of claims 12 to 14, wherein the plurality of motors comprises three or more motors, each motor comprising a voice coil and a magnetic element, and wherein the transducer assembly further comprises: three or more suspension systems, each suspension system associated with a motor and coupled to a respective voice coil of the motor; and a support assembly for transferring movement of the voice coils to the second diaphragm, the support assembly comprising three or more substantially straight connecting members, each of the connecting members extending between two suspension systems.

16. The transducer assembly of any of claims 12 to 15, further comprising a single motor for driving the first diaphragm.

17. The transducer assembly of any of claims 12 to 16, further comprising: a third diaphragm displaced from the second diaphragm along an axis; and at least one motor for driving the third diaphragm, wherein the first diaphragm is configured to generate first acoustic energy, the second diaphragm is configured to generate second acoustic energy, and the third diaphragm is configured to generate third acoustic energy, wherein the first and second acoustic energy is directed away from the assembly in a direction opposite to the third acoustic energy.

18. The transducer assembly of any of claims 12 to 17, wherein the at least one motor comprises a second plurality of motors for driving the third diaphragm and wherein the third diaphragm delimits an aperture.

19. The transducer assembly of any of claim 17 or 18. wherein the at least one motor comprises a second plurality of motors for driving the third diaphragm, and wherein the second plurality of motors: are arranged around the axis and are offset around the axis from the plurality of motors; and at least partially overlap the plurality of motors along the axis.

20. A playback device comprising: a transducer assembly comprising: a first diaphragm; a second diaphragm delimiting an aperture; and a plurality of motors for driving the second diaphragm, wherein the second diaphragm at least one of: surrounds the first diaphragm; or is arranged such that acoustic energy generated by the first diaphragm are directed through the aperture via a waveguide that is in fluid communication with the first diaphragm.

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