Earcup and headgear

Abstract

Headgear, preferably headphones (200, fig 2), comprises at least one earcup (310, 315, fig 2) to be supported over an ear of the wearer. The earcup comprises a housing (311, fig 4) having a protrusion portion (312, fig 4), and a cover 320 releasably attachable to the housing. The cover comprises a gap portion 326 through which the protrusion portion of the housing projects. The earcup further comprises a control interface adapted to generate a control signal for causing control of an operation of the earcup, wherein the control interface is provided on the protrusion portion. The releasable attachment may comprise a bayonet fixing or a magnetic fixing.

Description

BACKGROUND Earcups for headgear are often complicated multi-part assemblies that are not intended for disassembly after initial assembly. This means that the appearance of an earcup is often fixed over the lifetime of a product. SUMMARY In a first aspect, there is provided an earcup for headgear, the headgear for wearing on a wearer’s head, the earcup comprising: a housing to be supported over an ear of the wearer, the housing comprising a housing attachment feature; a cover releasably attachable to the housing, the cover comprising: a first portion coupled to a second portion and rotatable relative to the second portion, the first portion comprising a cover attachment feature to engage and disengage with the housing attachment feature by rotation of the first portion relative to the housing. The earcup may be referred to as an earcup assembly. There is provided an earcup with a housing having a cover attachable to, and detachable from, the housing by (e.g. the wearer) rotating a portion of the cover relative to the housing. The wearer may detach a given cover from the housing in order to replace the given cover with a different cover, for example, to customize the feel and / or appearance of the earcup by the different cover being attached to the housing. Put another way, there is provided a means of removing a cover from a housing by rotating a first portion of the cover, whilst the second portion of the cover does not rotate with respect to the housing at all or to the same extent. In this way, the first portion of the cover (rather than the second portion of the cover) performs the function of coupling the cover to the housing. The second portion of the cover may act as a covering for the housing, rather than performing a coupling function, meaning that the second portion may be subject to minimal handling and therefore be less likely to be damaged during assembly (e.g. by the wearer). This may help to preserve an appearance of a removable cover that may be prone to damage. In other words, there is provided a cover having a split arrangement where a portion of the cover (for example, a top portion) may rotate with respect to the housing in order to selectively engage the cover with, or selectively lock / unlock the cover to / from, the housing. Another portion of the cover (for example, a bottom portion) may remain rotationally fixed with respect to housing when the portion of the cover is rotated. When the first portion of the cover is rotated for attaching / detaching the cover to / from the housing, the second portion may move towards / away from the housing along an axis of rotation of the first portion. By providing a cover having a means of attachment that can be operated without requiring direct movement of the portion of the cover that is in contact with the housing, the housing and second portion of the cover may have any shape without requiring the second portion to be able to rotate relative to the housing. The first portion and the second portion combine to form the cover, for example a majority or an entirety thereof. Put another way, the first portion and the second portion may form between (and including) 50% and 100% of the cover. For example, the first portion and the second portion may form between (and including) between 50% and 100% of an external surface of the cover, the external surface being configured to form an external appearance of the earcup when the cover is attached to the housing. The first portion may be concentric with the second portion. The first portion may have a circular cross-section and the second portion may be annular. The second portion may partially overlap the housing, i.e., the second surface may cover more than one surface of the housing. For example, the second portion may comprise a main annular surface and a flange (or collar or rim) projecting from a perimeter of the main annular surface, wherein the flange overlaps the housing. The first portion may be rotatably coupled to second portion about an axis of rotation. The first portion may comprise a first member and second member, wherein the first member is a covering member, and wherein the second member is a coupling element comprising the cover attachment feature. The second member may be received within the first member. For example, the second member may be overmoulded onto the first member. When the cover is attached to the housing, the housing attachment feature is covered by the cover. When the cover is detached, or removed, from the housing, the housing attachment feature may be exposed. The housing attachment feature may be outwardly facing, i.e., may face away from the axis of rotation, and the cover attachment feature may be inwardly facing, i.e., may face towards the axis of rotation. The cover may be referred to as a facade, for example a housing facade. The cover may be understood to be an element for covering an external surface of the housing. The cover may be any suitable face, facing, case for covering an external surface of the housing. The cover may contain no active elements, for example, no electronic components, related to the electronic function of the earcup and / or headgear. Put another way, the cover may be an unpowered feature of the earcup. The cover may provide impact / surface damage protection to other components of the ear cup. The cover is attachable directly to the housing. Put another way, the cover is attachable to the housing without any intervening components that do not form part of the cover or the housing themselves being provided therebetween. The housing may be a chassis for housing a speaker driver for driving a speaker. The housing may cover an ear of the wearer when supported over the wearer’s ear. The housing may further comprise an ear cup adapted to contact the wearer’s head around the ear. The ear cup may be made from a flexible, or pliable, material. The first portion may comprise a plurality of cover attachment features, and wherein the housing comprises a corresponding plurality of housing attachment features. The housing attachment features may be equally spaced, for example, the housing attachment features may be at regular intervals around an annulus. By providing a plurality of attachment features on the cover and housing, the stability of the attachment between the cover and the housing may be improved. The plurality of cover attachment features may engage and disengage with the plurality of housing attachment features simultaneously. The plurality of cover attachment features may be arranged in an annular array. The cover attachment features may be equally spaced, for example, the cover attachment features may be at regular intervals around an annulus. The plurality of cover attachment features may be arranged in an annular array and the plurality of housing attachment features may be arranged in a concentric annular array. The annular array may be centred on an axis of rotation of the first portion. Each cover attachment feature is arranged at least 90° from each adjacent cover attachment feature about the annular array. By distributing the cover attachment features, and the corresponding housing attachment features, about the axis of rotation of the cover, the attachment features level the cover as the cover is attached to, and detached from, the housing. Put another way, the plurality of cover attachment features may keep the second portion of the cover substantially parallel with an outer surface of the housing as the cover is attached to, and detached from, the housing. The plurality of cover attachment features may be arranged uniformly in the annular array. In this way, the stability of the attachment between the cover and the housing may be further improved. The first portion may comprise three cover attachment features, and wherein the housing comprises three corresponding housing attachment features. By providing three points of attachment between the cover and the housing, the stability of the attachment between the cover and the housing may be further improved. The cover attachment feature and the housing attachment feature may form a bayonet fitting. The bayonet fitting may comprise a projection and a track adapted to receive the projection, the track having an opening, wherein the track is adapted to receive the projection at the opening, and wherein the projection is moved from the opening along the track by rotation of the first portion of the cover with respect to the housing in a first direction in order to attach the cover to the housing. In other words, the housing may comprise a track adapted to receive a projection provided on the coupling element of the cover. The track is adapted to receive the projection at one end and releasably secure the projection at another end after the wearer has rotated the first portion of the cover, and so rotated the coupling element, in the first direction. The cover attachment feature may comprise the projection and the housing attachment feature may comprise the track. The track may be angled to bring the cover closer to the housing as the cover is engaged with the housing. In other words, the track is angled such that the first portion of the cover is further away from the housing when the projection is received at the opening of the track compared to when the cover is engaged with the housing after the projection has travelled along the track in the first direction. For example, the track may be angled with respect to a base of the housing at an angle between 30° and 60°, for example at an angle of 45°. Put another way, as the first portion of the cover is rotated in the first direction when the projection is received at the opening of the track, the housing and the cover are brought closer together, for example as measured along an axis normal to an outer surface of the housing, or an axis of rotation of the first portion of the cover. Similarly, as the first portion of the cover is rotated in the second direction when the projection travels towards to opening of the track, the housing and the cover are forced apart. In this way, the interaction between the track and the projection may guide the wearer in the proper placement of the cover when the cover is being attached to the housing and may also assist the wearer in the removal of the cover from the housing when the cover is being detached from the housing. The projection may comprise: a rigid portion rigidly attached to the first portion; and a resiliently deformable portion attached to first portion by way of a resilient element, wherein the rigid portion is adapted to guide the projection along the track, and wherein the track comprises a ridge section connected to a seat section, and wherein rotation of the first portion in the first direction (i) urges the resiliently deformable portion to deflect so that the resiliently deformable portion passes over the ridge section and (ii) permits the resiliently deformable portion to return towards a rest state as the resiliently deformable portion enters the seat section so as to releasably rotationally inhibit rotation of the first portion in the second direction. Put another way, the projection may be divided into a guide portion (e.g. the rigid portion) and a flexible portion (e.g. the resiliently deformable portion), where the guide portion serves to guide the movement of the cover as the projection moves through the track and the flexible portion serves to releasably secure the projection within the track to prevent unintentional decoupling of the cover from the housing. The resilient element may be a resilient arm or a spring. The resiliently deformable portion need not return entirely towards a state of rest when entering the seat section, but may be partially sprung / deflected / deformed instead. That is, in the rest state, the resiliently deformable portion may be partially deformed but to a lesser degree than when urged by the ridge section. The seat section may be bordered by a single ridge or two ridges on either side. A ridge section may be a ledge or a lip between the track and the seat section, which may be a recess, or an elevated portion of the track. The ridge may be provided in a base or a side wall of the track. The track may comprise a base having two opposing side walls extending therefrom, the base of the track being parallel to the axis of rotation of the top portion of the cover, and wherein the resiliently deformable portion is biased in a direction angled to, the track. In this way, vibrations from movement between the housing and the cover may be dampened by the resilient arm. In some examples, the resiliently deformable portion is biased in a direction perpendicular and towards, the base of the track, for example towards the axis of rotation. The track may further comprise a stop structure spaced from the opening, wherein the projection is moved from the opening to the stop structure by rotation of the first portion of the cover with respect to the housing in the first direction. The stop structure may comprise a stop surface adapted to contact the rigid portion of the projection to inhibit rotation of the first portion of the cover in the first direction. In this way, over rotation of the first portion of the cover in the first direction may be prevented. The earcup may further comprise a vibration dampener arranged between the cover and the housing. In this way, vibrations from movement between the housing and the cover may be dampened. The vibration dampener may comprise any elastic or flexible or pliant material. For example, the vibration dampener may comprise a foam. The vibration dampener may be provided on the cover or the housing. The housing may further comprise a protrusion, and wherein the first portion defines a socket for receiving the protrusion. The second portion may comprise an aperture through which the protrusion of the first portion protrudes. In this way, the housing may comprise a protrusion that can accommodate various components therein, whilst also providing a locating feature for locating the cover in the correct position when attaching the cover to the housing. The housing attachment feature may be provided on the protrusion and the cover attachment feature may be provided within the socket. The housing may be generally cylindrical. The housing attachment feature may be provided on an inner outwardly-facing cylindrical wall of the housing. The housing may comprise one or more external surfaces, and wherein the cover covers a majority of the one or more external surfaces of the housing. The external surface may include surfaces that are exposed to the environment surrounding the earcup and / or headgear during use. The external surface may exclude surface that are covered by the wearer in use. The external surfaces of the housing may be any surface of the housing arranged to contact the cover. The external surfaces of the housing may be any surface of the housing arranged to not contact the ear of the wearer. The housing may comprise one or more internal surface, facing a space at least partially enclosed by the housing, and the wall of the housing may comprise the one or more internal surfaces on one side and the one or more external surfaces on the other. The cover may cover a majority of the one or more external surfaces of the housing, for example more than 50% of the one or more external surfaces of the housing. A majority of the one or more external surfaces of the housing may be more than 50% of the one or more external surfaces of the housing, such as more than 60% of the one or more external surfaces of the housing, such as more than 70% of the one or more external surfaces of the housing, such as more than 80% of the one or more external surfaces of the housing, such as more than 90% of the one or more external surfaces of the housing. The second portion of the cover may comprise a gap portion, and wherein the housing comprises a protrusion portion adapted to protrude through the gap portion when the cover is attached to the housing. The gap portion may comprise a notch for exposing the housing through the cover. The notch may be any shaped indent, cut-away, aperture, window, opening, hole or the like in the cover through which at least a portion of the housing is exposed. The notch may be formed at an edge of the cover. The protrusion portion may substantially fill the gap portion, for example, the notch. For example, when the cover is attached to the housing, the protrusion portion may occupy at least 90% of an area or volume of the gap portion, the area or volume being the area or volume required to complete rotational symmetry of the cover. In this way, undesirable movement and vibrations between the cover and the housing may be reduced. Put another way, the perimeter of the protrusion portion may be sized and shaped to substantially match a boundary of the gap portion. In a second aspect, there is provided a headgear comprising the earcup of the first aspect. The headgear may further comprise a headband adapted to contact the wearer’s head and adapted to support the housing over the ear of the wearer. The headgear may comprise a speaker housed by the housing. The headgear may comprise: a pair of housings to be supported over the ears of the wearer; and a pair of covers, wherein each cover is adapted to be removably attached to a respective housing of the pair of housings. In a third aspect, there is provided a cover releasably attachable to a housing of an earcup for headgear, the headgear for wearing on a wearer’s head, the cover for covering the housing, the cover comprising: a first portion rotatably coupled to a second portion, the first portion comprising a cover attachment feature to engage and disengage with the housing to secure the cover to the housing by rotation of the first portion relative to the second portion and the housing. The first portion may comprise: a covering element; and a coupling element, wherein the coupling element is adapted to rotatably couple the covering element to the second portion, and wherein the coupling element comprises the cover attachment feature. In a fourth aspect, there is provided a method of manufacturing a cover releasably attachable to a housing of an earcup for headgear, the headgear for wearing on a wearer’s head, the cover for covering the housing, the method comprising: rotatably coupling first and second portions of the cover using a coupling element comprising a cover attachment portion for releasably attaching the cover to the housing. In a fifth aspect, there is provided an earcup for headgear, the headgear for wearing on a wearer’s head, the earcup comprising: a housing to be supported over an ear of the wearer, the housing comprising a housing attachment feature; a cover comprising a cover attachment feature to releasably engage with the housing attachment feature, wherein the cover attachment feature and the housing attachment feature define a magnet coupling. There is provided an earcup with a housing having a cover attached thereto, wherein the cover is attachable to, and detachable from, the housing by way of a magnet coupling. The wearer may detach a given cover from the housing in order to replace the cover with a different cover, for example, to customize the appearance of the earcup. By providing a magnet coupling as the means of releasably attaching the cover to the housing, the process of attaching the cover to the housing is greatly simplified for the wearer. For example, to attach the cover to the housing, the wearer may simply bring the cover into close proximity with the housing, such that the housing attachment feature and the cover attachment feature are brought into close proximity with each other, in order to engage the magnet coupling and is not required to rotate or actuate a locking mechanism separately. Similarly, to detach the cover from the housing, the wearer may simply pull the cover away from the housing in order to disengage the magnet coupling and is not required to rotate or actuate a locking mechanism separately. Further, as magnet couplings do not require direct contact in order to attach to each other, the cover may attach to the housing in a variety of different orientations, such as the angle in which the wearer brings the cover and the housing together, without reducing the attachment strength of the magnet coupling. Further, a magnet coupling does not require any relative rotating parts in order to engage / disengage. For example, the magnet coupling may comprise two magnets, one in the housing and one in the cover, that attract each other to form the magnet coupling. When the cover is attached to the housing, the housing attachment feature is covered by the cover. When the cover is detached, or removed, from the housing, the housing attachment feature may be exposed. The cover may be referred to as a facade, for example a housing facade. The cover may be for covering the housing, such as an external surface of the housing, when the cover attachment feature is releasably engaged (for example by the wearer of the headgear) with the housing attachment feature. The cover may be understood to be an element for covering an external surface of the housing. The cover may be any suitable face, facing, or case for covering an external surface of the housing. The cover contains no active elements, for example no electronic components, related to the electronic function of the earcup and / or headgear. Put another way, the cover may be an unpowered feature of the earcup. The cover is attachable directly to the housing. Put another way, the cover is attachable to the housing without any intervening components that do not form part of the cover or the housing themselves being provided therebetween. The housing may be a chassis for housing a speaker driver for driving a speaker. The housing may cover an ear of the wearer when supported over the wearer’s ear. The housing may further comprise an ear cup adapted to contact the wearer’s head around the ear. The ear cup may be made from a flexible, or pliable, material. Put another way, a magnetic strength of the magnet coupling between the cover and the housing may be such that when the wearer pulls the cover in a direction away from the wearer’s ear, the housing moves away from the wearer’s ear before the cover decouples from the housing. In this way, the wearer may be prevented from inadvertently removing the cover from the housing when the wearer intends to simply remove the headgear from the wearer’s head. The cover attachment feature may comprise a cover magnet and / or the housing attachment feature comprises a housing magnet to form part of the magnet coupling. In other words, the cover and / or the housing may comprise a magnet forming part of the magnet coupling between the cover and the housing. The cover / housing magnet may be any suitable type of magnet, such as a button magnet. A polar axis of the magnet may be aligned, or parallel, with a longitudinal axis of the cover and / or a longitudinal axis of the housing. The cover attachment feature may comprise a plurality of cover magnets and / or the housing attachment feature comprises a plurality of housing magnets to form part of the magnet coupling. In other words, the plurality of magnets may form part of the magnet coupling between the cover and the housing. The magnet coupling may have a given magnetic strength and the number of magnets forming part of the magnet coupling may be adjusted in order to achieve the desired magnetic strength. For example, for a magnet coupling comprising a larger number of magnets, each magnet may have a lesser individual magnetic strength, and for a magnet coupling comprising a smaller number of magnets, each magnet may have a greater individual magnetic strength. The provision of a plurality of magnets may improve the strength, and distribution of strength, of the magnet coupling between the cover and the housing. Further, the provision of a plurality of magnets may provide multiple different attachment points and / or orientations between the cover and the housing. In addition, the plurality of magnets may comprise a plurality of the same type of magnets or a plurality of different types of magnets. The cover attachment feature may comprise a plurality of cover magnets arranged in an annular array and / or the housing attachment feature comprises a plurality of housing magnets arranged in an annular array to form part of the magnet coupling. In other words, the plurality of magnets may be arranged in an annular array within, or on, the cover and / or housing. The annular array may be a complete annulus or a partial annulus. The annular array may comprise gaps, or spaces, in the array absent of magnets, for example in an alternating arrangement. The annular array may be substantially annular and may comprise one or more concentric annular arrangements of magnets. The magnets in the annular array may be spaced from each other uniformly. The plurality of magnets may be arranged in an alternating array, where each magnet has a polarity opposite to the adjacent magnets in the array. The annular array may comprise: a first portion having a first magnetic strength; and a second portion having a second magnetic strength, wherein the first magnetic strength is greater than the second magnetic strength. In other words, the magnetic strength of the plurality of cover magnets may not be distributed uniformly about the annular array, such that the disengagement of the cover from the housing occurs in a preferential direction. In this way, the wearer may be encouraged to remove the cover from the housing in a desirable motion, for example, to limit wear on the cover and / or the housing. Further, the first portion may be provided proximate to a portion of the earcup of the headgear that the wearer interacts with more often, for example to remove the headgear from their head, to prevent accidental removal of the cover. The cover attachment feature may comprise one or more ring-shaped magnets and / or the housing attachment comprises one or more ring-shaped magnets to form part of the magnet coupling. In other words, the magnet may be provided in the shape of a ring. In this way, the one or more ring magnets may be arranged in a concentric array with substantially circular features or components of the cover and / or the housing. The cover attachment feature may comprise a cover ferromagnetic element and / or the housing attachment feature comprises a housing ferromagnetic element to form part of the magnet coupling. In other words, the magnet coupling may include an element that a magnet provided in the cover and / or the housing may attract. Thus, the magnet coupling may comprise a magnet-ferromagnetic element coupling. The housing may comprise a protrusion, and wherein the cover comprises a socket for receiving the protrusion. In this way, the housing may comprise a protrusion that can accommodate various components therein, whilst also providing a locating feature for locating / aligning the cover in the correct position when attaching the cover to the housing. The housing attachment feature may be provided on the protrusion, and the cover attachment feature is provided within the socket. In this way, the attachment features may be provided around the locating feature for locating the cover in the correct position when attaching the cover to the housing, thereby improving the ease with which the cover may be attached to the housing. The earcup may comprise a cover insert arranged to be coupled to the cover within the socket and arranged to receive the cover attachment feature. A force required to decouple the cover insert from the cover may be greater than a force required to decouple the magnet coupling. Put another way, a magnetic strength of the magnet coupling between the cover and the housing may be such that when the wearer pulls the cover in a direction away from the wearer’s ear, the cover decouples from the housing before the cover insert decouples from the cover. In this way, the wearer may be prevented from inadvertently removing the cover insert from the cover when the wearer intended to simply remove the cover from the housing. The cover insert may be coupled to the cover by way of a suitable adhesive. The protrusion may comprise a sloped surface arranged to contact a surface of the socket. In this way, the protrusion may act as an alignment feature for guiding the wearer in the proper placement to couple the cover to the housing. The housing may comprise a housing attachment seat arranged to receive the housing attachment feature. In this way, the housing attachment feature may be provided with a seat to ensure the housing attachment feature is held in an optimal position for coupling with the cover attachment feature. The housing attachment seat may be provided in the sloped surface of the protrusion. The housing may comprise one or more external surfaces, and wherein the cover covers a majority of the one or more external surfaces of the housing. The second portion of the cover comprises a gap portion, and wherein the housing comprises a protrusion portion adapted to protrude through the gap portion when then cover is attached to the housing. In an embodiment, the gap-portion comprises a notch for exposing the housing through the cover. The notch may be any shaped indent, cut-away, aperture, window, opening, hole or the like in the cover through which at least a portion of the housing is exposed. The protrusion portion may substantially fill the gap portion. In this way, undesirable movement and vibrations between the cover and the housing may be reduced. Put another way, the perimeter of the protrusion portion may be sized and shaped to substantially match a boundary of the gap portion. In a sixth aspect, there is provided a headgear comprising the earcup of the fifth aspect. May further comprise a headband adapted to contact the wearer’s head and adapted to support the housing over the ear of the wearer. The headgear may be arranged to apply a clamping force against the wearer’s head to hold the headgear on the wearer’s head, and wherein a force required to decouple the magnet coupling is greater than the clamping force. The headband may be arranged to apply the clamping force against the wearer’s head to hold the headgear on the wearer’s head. The headgear may further comprise a speaker housed by the housing. The headgear may comprise: a pair of housings to be supported over the ears of the wearer; and a pair of covers, wherein each cover is adapted to be removably attachable to a respective housing of the pair of housings. The covers may be handed, i.e., each cover may only connect to one of the pair of housings, or unhanded, i.e., each cover may be connectable to either of the housings. According to a seventh aspect, there is provided a cover releasably attachable to a housing of an earcup for headgear, the headgear for wearing on a wearer’s head, the cover for covering the housing, the cover comprising a cover attachment feature arranged to magnetically couple with a housing attachment feature of the housing. The earcup may comprise a speaker driver housed by the housing and the cover may be arranged to cover a portion of the housing that houses the speaker driver. In an eighth aspect, there is provided a method of assembling a cover releasably attachable to a housing of an earcup of a headgear, the headgear for wearing on a wearer’s head, the cover for covering the housing, the method comprising: inserting a cover insert into a socket of the cover, the cover insert having a cover attachment feature or being arranged to receive the cover attachment feature, the cover attachment feature arranged to magnetically couple with a housing attachment feature of the housing; and bonding the cover insert to the socket. In an embodiment, inserting the cover insert into the socket of the cover comprises snap, or press, fitting the cover insert into the socket. In an embodiment, bonding the cover insert to the socket comprises applying an adhesive to the cover insert, and / or the socket, to adhere the cover insert and the socket to each other. According to a ninth aspect, there is provided an earcup for headgear, the headgear for wearing on a wearer’s head, the earcup comprising: a housing to be supported over an ear of the wearer, wherein the housing comprises a protrusion portion; a cover releasably attachable to the housing, wherein the cover comprises a gap portion, and wherein the protrusion portion of the housing projects through the gap portion; and a control interface adapted to generate a control signal for causing control of an operation of the earcup and / or headgear, wherein the control interface is provided on the protrusion portion. There is provided an earcup having a cover releasably attachable to a housing that includes a control interface. The control interface is provided on a protrusion portion of the housing that protrudes, or extends, through a gap in the cover. The housing may be generally cylindrical. The control interface may be provided on an outer outwardly-facing cylindrical wall of the housing. The gap portion in the cover may be defined as a portion of the cover through which a projection may be received in an otherwise solid, or uniform, or unperforated surface of the cover. The gap portion may be an enclosed aperture, having cover material surrounding the gap portion, or an unenclosed aperture, absent of cover material on one or more sides of the gap portion. The gap portion may comprise a notch for exposing the housing through the cover. The notch may be any shaped indent, cut-away, aperture, window, opening, hole or the like in the cover through which at least a portion of the housing is exposed. The protrusion portion may project in a direction away from the ear of the wearer. Put another way, the protrusion portion may project along a longitudinal axis of the housing away from a base of the housing. The wearer may detach a given cover from the housing in order to replace the cover with a different cover, for example, to customize the appearance of the earcup. By providing the control interface on the housing, as opposed to the cover, the attachment and removal of the cover is simplified as the wearer is not required to sever any electrical connections, or navigate any protruding controls, between the cover and the housing. In this way, the interchanging of one or more covers may be performed without imparting a burden on the user. Further, the ease of manufacture of the cover assemblies may be improved by excluding any electronic components. Further, by providing the control interface on the protrusion portion that extends through and past the cover, the ease of access of the wearer to the control interface is improved. The cover may be referred to as a facade, for example a housing facade. The cover may be understood to be an element for covering an external surface of the housing. The cover may be any suitable face, facing, case for covering an external surface of the housing. The cover may contain no active elements, for example, no electronic components, related to the electronic function of the earcup and / or headgear. Put another way, the cover may be an unpowered feature of the earcup. The cover is attachable directly to the housing. Put another way, the cover is attachable to the housing without any intervening components that do not form part of the cover or the housing themselves being provided therebetween. The housing may be a chassis for housing a speaker driver for driving a speaker. The housing may cover an ear of the wearer when supported over the wearer’s ear. The housing may further comprise an ear cup adapted to contact the wearer’s head around the ear. The ear cup may be made from a flexible, or pliable, material. The control signal may be for causing pairing of the earcup and / or headgear with an external device, such as a smartphone or smartwatch. The pairing may be Bluetooth pairing such that the operation of the earcup and / or headgear is a data communications operation for transferring data to the earcup and / or headgear, such as audio data. The audio data may be used for audio output to the wearer by the speaker driver. The housing may comprise one or more external surfaces, and wherein the cover covers a majority of the one or more external surfaces of the housing. In this way, the cover is provided on the housing so as to change the appearance of a substantial part of the housing. The external surfaces of the housing may be any surface of the housing arranged to contact the cover. The external surfaces of the housing may be any surface of the housing arranged to not contact the ear of the wearer. The housing may comprise one or more internal surface, facing a space at least partially enclosed by the housing, and the wall of the housing may comprises the one or more internal surfaces on one side and the one or more external surfaces on the other. The cover may cover a majority of the one or more external surfaces of the housing, for example more than 50% of the one or more external surfaces of the housing. The protrusion portion may substantially fill the gap portion. In this way, undesirable movement and vibrations between the cover and the housing may be reduced. Put another way, the perimeter of the protrusion portion may be sized and shaped to substantially match a boundary of the gap portion. In use, the protrusion portion may sit towards a rear portion of the ear of the wearer. In this way, the ease of access of the user to the control interface may be improved. In some embodiments, the protrusion portion may sit towards a lower portion of the ear of the wearer. In some embodiments, the protrusion portion may sit behind and below the ear of the wearer. The control interface may be provided proximal to a perimeter of the protrusion portion. In this way, the ease of access of the user to the control interface may be improved. In an embodiment, the control interface may be provided at or near the perimeter of the protrusion portion. In an embodiment, the control interface may be provided on a perimeter surface of the protrusion portion. The control interface may protrude radially from the projection portion, e.g., in a direction perpendicular to the longitudinal axis of the housing. The control interface may comprise one or more sensors. In this way, the control signal may be generated based on sensor signals generating by the one or more sensors in response to an external stimulus. The one or more sensors may comprise one or more microphone sensors. In this way, the control signal may be generated based on sensor signals generating by the one or more microphone sensors in response to external audio inputs, such as monitoring environmental sounds for active noise cancelling or speech for telephony. The control interface may comprise one or more user input interfaces. In this way, the control signal may be generated based on a user input, for example a physical input by the wearer (e.g. the wearer of the headgear). The user input interfaces may include one or more of: a button; a dial; a slider; a switch; a joystick; and the like. The control interface may comprise one or more input and / or output ports. In this way, the control signal may be generated based on an external control signal. The input and / or output port may be an input / output (I / O) port, such as a USB port. The housing may comprise a housing attachment feature and the cover may comprise a cover attachment feature adapted to releasably engage with the housing attachment feature to releasably attach the cover to the housing. The cover may comprise a first portion and a second portion, the cover attachment feature being provided on or coupled to the first portion, wherein, in use, the first portion is distal to the ear of the wearer when the headgear is worn on the wearer’s head, compared to the second portion that is proximal to the ear of the wearer. The first and second portions may be connected to each other. A length of a perimeter of the first portion may be smaller than a length of a perimeter of the second portion. In this way, the wearer is provided with a tactile differentiation between the top portion and the control interface in order to improve the ease of locating the control interface or the top portion of the cover to remove the cover from the housing depending on the action they wish to perform. The first portion may be spaced from the protrusion portion, for example such that the perimeter of the first portion does not overlap with, or contact, the perimeter of the protrusion portion. The first portion may be provided at the centre of the cover, whereas the protrusion portion may be provided towards a perimeter of the housing and so align with the perimeter of the cover and away from the first portion. A height of a protrusion of the first portion from the second portion may be greater than or equal to a height of a protrusion of the protrusion portion from the second portion. In this way, the wearer is provided with a tactile differentiation between the top portion and the control interface in order to improve the ease of locating the control interface or the top portion of the cover to remove the cover from the housing depending on the action they wish to perform. The height of the protrusion of the first portion and the height of the protrusion of the protrusion portion may be measured from an external surface of the second portion. The housing may comprise a protrusion portion and the first portion may define a socket for receiving the protrusion portion. In this way, the housing may comprise a protrusion that can accommodate various components therein, whilst also providing a locating feature for locating (e.g. aligning) the cover in the correct position when attaching the cover to the housing. The protrusion portion may be a central protrusion, for example aligned with a central axis of the housing. The protrusion portion may accommodate a speaker driver therein. The housing attachment feature may be provided on or near to the protrusion portion, and the cover attachment feature is provided within the socket. In this way, the attachment features may be provided around the locating feature for locating the cover in the correct position when attaching the cover to the housing, thereby improving the ease with which the cover may be attached to the housing. The first portion may be coupled to the second portion and rotatable relative to the second portion, wherein the cover attachment feature is adapted to: engage and disengage with the housing attachment feature by rotation of the first portion relative to the housing. Put another way, there is provided a means of removing a cover from a housing by rotating a portion of the cover, whilst the remaining portion of the cover does not rotate with respect to the housing. In other words, there is provided a cover having a split arrangement where a top portion of the cover may rotate with respect to the housing in order to selectively engage the cover with the housing whilst a bottom portion of the cover remains rotationally fixed with respect to housing. By providing a cover having a means of attachment that can be operated without requiring movement of the portion of the cover that is in contact with the housing, the housing and base portion of the cover (e.g. the second portion) may have any shape without requiring the base portion to be able to rotate relative to the housing. The cover attachment feature and the housing attachment feature may form a bayonet fitting. The cover attachment feature and the housing attachment feature may define a magnet coupling. By providing a magnet coupling as the means of releasably attaching the cover to the housing, the process of attaching the cover to the housing is greatly simplified for the wearer. For example, to attach the cover to the housing, the wearer may simply bring the cover into close proximity with the housing in order to engage the magnet coupling and is not required to rotate or actuate a locking mechanism separately. Similarly, to detach the cover from the housing, the wearer may simply pull the cover away from the housing in order to disengage the magnet coupling and is not required to rotate or actuate a locking mechanism separately. Further, as magnet couplings do not require direct contact in order to attach to each other, the cover may attach to the housing in a variety of different orientations without reducing the attachment strength of the magnet coupling. In a tenth aspect, there is provided a headgear comprising the earcup of the ninth aspect. The headgear may further comprise a headband adapted to contact the wearer’s head and adapted to support the housing over the ear of the wearer. The headgear may comprise a speaker housed by the housing. Thus, there may be provided a set of headphones for wearing by the wearer. The headgear may comprise: a pair of housings, wherein each housing is to be supported over an ear of the wearer; and a pair of covers, wherein each cover is adapted to be removably attached to a respective housing of the pair of housings. The protrusion portion may be arcuate. The protrusion portion may extend around a perimeter of the housing. For example, the protrusion portion may extend around a quarter of a length of the perimeter of the housing. An outer edge of the protrusion portion may follow a curvature of an outer edge of the cover. Tn an embodiment, the outer edge of the cover is at least partially, or fully, circular. According to an eleventh aspect, there is provided a cover releasably attachable to a housing of an earcup for headgear, the headgear for wearing on a wearer’s head, the cover for partially covering the housing, the housing having a protrusion portion, the earcup comprising a control interface provided on the protrusion portion, the cover comprising: a gap portion for accommodating the protrusion portion of the housing. Any feature of any of the aspects described above may be combinable with any feature of any other aspect described above. BRIEF DESCRIPTION OF THE DRAWINGS Figure I shows a schematic representation of an earcup; Figure 2 shows a perspective view of a headgear for wearing on a wearer’s head; Figure 3 shows a perspective view of a cap removed from a housing; Figure 4 shows a perspective view of a housing with a cover removed; Figure 5 shows a cross section of the cover of Figure 3; Figure 6 shows a perspective view of the cover of Figure 3; Figure 7 shows a cross section of the cover of Figure 3 attached to the housing of Figure 4; Figure 8 shows a perspective view of a cover removed from a housing; Figure 9 shows a perspective view of a housing with a cover removed; Figure 10 shows a perspective view of a housing with a cover removed; Figure 11 shows two elevation views of the housing of Figure 4; Figure 12 shows a rear elevation view of the headgear shown in Figure 2; and Figure 13 shows a bottom elevation view of the headgear shown in Figure 2. DETAILED DESCRIPTION Figure 1 shows a schematic representation of an earcup 100 comprising a housing 110 and a cover 120. The cover 120 is releasably attachable to the housing 110 by way of a cover attachment feature 130 provided on the cover 120 and a housing attachment feature 140 provided on the housing. The various embodiments of the cover attachment feature 130 and the housing attachment feature 140 are discussed in further detail below. Figure 2 shows a perspective view of a headgear 200 for wearing on a wearer’s head. In the example shown in Figure 2, the headgear 200 is a pair of headphones having a pair of earcups 310, 315, supported over each ear of the wearer by a headband 210, each earcup 310, 315 is covered by a respective cover 320, 325 (each cover which may be referred to as a cap). Each earcup 310, 315 comprises a respective housing, each of which is covered by one of the respective covers 320, 325, such that the respective housings are not visible in Figure 2 apart from the protrusion portion 312 of one of the housings, which protrudes through the cover 320. The protrusion portion 312 is described in further detail below. Each earcup 310, 315 comprises a respective cushion, or earpad, 220, 225 provided between the earcups 310, 315 and the side of the wearer’s head. In the example shown in Figure 2, the headgear includes a pair of speakers (one speaker 320 of the pair of speakers is shown in Figure 2), each directed towards a respective ear of the wearer. The speakers are each housed by one of the respective housings of the earcups 310, 315. The speakers are driven by speaker drivers housed by the earcups 310, 315. Figure 3 shows a perspective view of the cover 320 removed from the housing 311, Figure 4 shows a perspective view of the housing 311 with the cover 320 removed, Figure 5 shows a cross section of the cover 320 and Figure 6 shows a perspective view of the cover 320. The cover 320 comprises a first portion 321 coupled to a second portion 324. The first portion 321 is rotatable relative to the second portion. In addition, the second portion 324 of the cover 320 comprises a gap portion 326 through which a protrusion portion 312 of the housing 311 projects when the cover 320 is attached to the housing 311. The protrusion portion 312 and the gap portion 326 are dimensioned such that the protrusion portion 312 substantially fills the gap portion 326 when the cover 320 is attached to the housing 311 as shown in Figure 2. The length of the perimeter 327 of the first portion 321 is smaller than the length of the perimeter 329 of the second portion 342. In the example shown in Figure 3, the first portion 321 and the second portion 324 are coaxial cylinders, with the first portion 321 having a circumference / diameter less than the second portion 324. When the cover 320 is attached to the housing 311, the height of the protrusion of the first portion 321 from the second portion 324 is equal to a height of a protrusion of the protrusion portion 312 from the second portion 324housing 311. In other examples, the heights may differ. For example, when the cover 320 is attached to the housing 311, the height of the protrusion of the first portion 321 from the second portion 324 may be greater than the height of the protrusion of the protrusion portion 312 from the second portion 324. As illustrated in Figures 5 and 6, the first portion 321 of the cover comprises a covering element 322 and a coupling element 323. The coupling element 323 is snap-fit into the covering element 322 in order to form the first portion of the 321 of the cover 320. The coupling element 323 rotatably couples the covering element 322 to the second portion 324 of the cover 320. The coupling element 323 comprises three cover attachment features 330 in an annular array that engage / disengage with corresponding housing attachment features 340 of the housing 311. In the examples shown in Figures 4, 5 and 6, the cover attachment features 330 and the housing attachment features 340 define bayonet fittings. The housing attachment features 340 are arranged in a uniformly spaced annular array formed of the three housing attachment features 340. It should be noted that any number of housing attachment features 340, and corresponding cover attachment features 330, may be provided for coupling the cover 320 to the housing 311 and they need not be uniformly spaced; however, three attachment features provides a stable connection between the cover 320 and the housing 311 without overly complicating the manufacture and design of both the cover 320 and the housing 311. The three housing attachment features 340 are arranged about a protrusion 350 of the housing. The cover attachment features 330 are arranged in a corresponding uniformly spaced annular array formed of the three cover attachment features 330. The cover attachment features 330 are located within a socket 360 of the cover. The socket 360 is defined by the first portion 321 of the cover 320. When the cover 320 is attached to the housing 311, the protrusion 350 is received within the socket 360. The cover attachment features 330 each comprise a projection 334, which is divided into a rigid portion 331 and a resiliently deformable portion 332 attached to the first portion 331, and specifically the coupling element 323, by way of a resilient element 333 in the form of a flexible arm. The curved profile of the rigid portion 331 may aid with the alignment of the cover attachment features 330 with the housing attachment features 340. The housing attachment features 340 each comprise a track 341 for receiving the rigid portion 331 and the resiliently deformable portion 332 of the projection 334. The track 341 has an opening 342 for receiving the projection 334 when the cover 320 is brought towards the housing 311. Both the rigid portion 331 and the resiliently deformable portion 332 of the projection 334 are moved from the opening 342 along the track 341 by rotation of the first portion 321 of the cover 320 with respect to the housing 311 in a first direction in order to attach the cover 320 to the housing 311. When the projection 334 is received at the opening 342 of the housing attachment feature 340, the rigid portion 331 guides the projection 334 along the track 341 as the first portion 321 is rotated relative to the housing 311. The track 341 comprises two ridge sections 343, 344 connected to a seat section 345 provided therebetween. Rotation of the first portion 321 in the first direction urges the resiliently deformable portion 332 to deflect so that the resiliently deformable portion 332 passes over the first ridge section 343 and into the seat section 345. The resiliently deformable portion 332 then returns towards a rest state as the resiliently deformable portion 332 enters the seat section 345, which releasably inhibits the rotation of the first portion 321 in the second direction, which is opposite the first direction. The second ridge section 344 can help to prevent over-rotation of the first portion 321 in the first direction. The resiliently deformable portion 332 protrudes, for example towards the axis of rotation 328 of the first portion 321 further than the rigid portion 331. Thus, the rigid portion 331 does not engage with the first and second ridge sections 343, 344 as the projection 334 passes over the first and second ridge sections 343, 344. Rather, the rigid portion 331 is guided by the side wall of the track 341. As shown in Figure 4, the track 341 comprises a base having two opposing side walls extending therefrom. The base, on which the ridges 343, 344 and the seat section 345 are provided, is parallel to an axis of rotation 328 of the first portion 321 of the cover. The resilient element 333 biases the resilient portion 332 towards the base of the track 341, i.e., towards the axis of rotation 328. As shown in Figure 4, the track 341 includes an angled portion 346 adapted to bring the cover 320 closer to the housing 311 as the cover 320 is engaged with the housing 311 and move the cover 320 away from the housing 311 as the cover 320 is disengaged with the housing 311. In addition, at the end of the track 341 opposite the opening 342 is a stop surface 347 that forms part of a stop structure. When the first portion 321 of the cover 320 is rotated in the first direction, the projection 334 of the cover attachment feature 330 moves towards the stop surface 347. The stop surface 347 contacts the rigid portion 331 of the projection 334 in order to prevent over rotation of the first portion 321 in the first direction. As shown in Figure 6, the cover 320 may also comprise a plurality of vibration dampeners 335 adapted to absorb / eliminate vibrations between the cover 320 and the housing 311. One or more vibration dampeners 335 may be provided according to the desired implementation. As shown in Figure 2, when compared to Figure 4, the cover 320 covers a majority of the external surfaces of the housing 320, other than the protrusion portion 312. In use, the protrusion portion 312 sits below and behind the ear of the user. As shown in Figure 4, the protrusion portion 312, and correspondingly the gap portion 326, is arcuate and extends around a perimeter of the housing 311, such that an outer edge of the protrusion portion 312 follows a curvature of an outer edge of the cover 320. Figure 7 shows a cross section of the cover 320 attached to the housing 311 illustrating the resilient portion 332 of the projection 334 received within the seat section 345 of the track 341. Figures 8 to 10 illustrate a housing 410 and a cover 420 adapted to releasably attach to each other by of a magnet coupling. It will be appreciated that any of the features of the headgear, cover or housing described above may apply equally to those described below, such as the gap portion 426 in the cover 420 and the protrusion portion 412 of the housing 410. In the example shown in Figure 8, the cover attachment feature comprises a plurality of cover magnets 430 arranged in an annular array within a socket 460 of the cover 420. The plurality of cover magnets 430 are held within the socket 460 by way of a cover insert 470 that includes a plurality of cover magnet seats 472 adapted to receive one of the plurality of cover magnets 430. The cover insert 470 is bonded to the cover 420 within the socket 460 with a bonding strength greater than that of the magnetic strength coupling the cover 420 to the housing. In the example shown in Figure 9, the housing attachment feature comprises a plurality of housing magnets 440 arranged in a uniformly spaced annular array on a sloped surface 452 of a projection 450 of the housing, which is received within the socket 460 of the cover 420 when the cover 420 and the housing 410 are attached. Each of the plurality of housing magnets 440 are received in a respective housing attachment seat 442, which is integrally formed into the sloped surface 452 of the projection 450. When the cover 420 is brought towards the housing 410 for attachment, the sloped surface 452 acts as a locating feature by contacting an inner surface of the socket 460 of the cover 410 and guiding the cover magnets 430 into alignment with the housing magnets 440. In addition, the gap portion 426 and the protrusion portion 412 also serve to align the cover 420 with the housing 410 as the wearer attaches the cover 420 to the housing. The gap portion 426 and the protrusion portion 412 may differentiate handed attachment arrangement from each other, i.e., by providing different sizes or shapes of protrusion portion 412 and gap portion 426 for different housings 410 and covers 420. In an unhanded arrangement, the protrusion portion 412 and the gap portion 426 may be uniform across multiple different housings 410 and covers 420. In the example shown in Figure 2, the headband 210 of the headgear 200 is adapted to apply a clamping force against the wearer’s head to hold the headgear on the wearer’s head. When the cover 420 is attached to the housing 410, the cover 420 is held to the housing 410 with a given magnetic strength, which is determined by the strength and number of the cover magnets 430 and the housing magnets 440. When the wearer goes to remove the headgear 200 from their head, they will apply a force against the clamping force in order to remove the headgear. As the cover 420 is on the outside of the housing 410, the wearer may grip the covers 420 in order to remove the headgear 200 from their head. In order to prevent the covers 420 from being accidentally removed from the housings 410 when the wearer is removing the headgear 200 from their head, the magnetic strength of the cover magnets 430 and the housing magnets 440 is tuned such that a force required to decouple the magnet coupling is greater than the clamping force. In the example shown in Figure 10, the housing 420 includes an annular array of housing magnets 440 arranged in a non-uniform manner. It will be appreciated that the corresponding cover 410 would have a similar distribution of cover magnets 430 to the array shown in Figure 9. The annular array of housing magnets 440 is divided into a first portion 442 having a first magnetic strength and a second portion 444 having a second magnetic strength. The first magnetic strength is greater than the second magnetic strength. In the example shown in Figure 10, the greater first magnetic strength is achieved by providing more housing magnets 440 in the first portion 442 and more empty housing attachment seats 445 in the second portion. The positioning, and relative strengths, of the first 442 and second 444 portions may be altered depending on the desired preferential direction in which the cover 420 is removed. The magnets in each array of cover magnets 430 and housing magnets 440 may be arranged with alternating polarities. If the cover 420 then includes a rotatable first portion similar to that described above with reference to Figure 3, the alternating polarities of the magnets may be used to eject the cover 420 from the housing 410 as the first portion is rotated to align similar poles. Figure 11 shows two elevation views of the housing 311 of Figure 4. The elevation views show the same housing 311, with the right elevation showing the housing 311 being mirrored and rotated by 90° with respect to view shown in the left elevation. The left 27 elevation shows the rear side of the housing 311, which faces generally backwards (i.e., facing away from the wearer’s front) when worn (e.g., see Figure 12). The right elevation shows the rear side of the housing 311, which faces generally downwards (i.e., towards the wearer’s shoulders) when worn (e.g., see Figure 13). Each elevation view shows a portion of a control interface 500 provided on the perimeter surface of the protrusion portion 312 of the housing 311. The control interface 500 is adapted to generate a control signal for causing control of an operation of the headgear. In the example shown in Figure 11, the control interface includes a microphone sensor 510, auser input interface 520 in the form of a button, an LED 530 and an input / output port 540. Figures 12 and 13 show rear and bottom elevation views of the headgear 200 of Figure 2, respectively. Figures 12 and 13 illustrate the relative positioning of control interfaces 500, 501 on the earcups 310, 315 of the headgear 200. The elevation view shown in Figure 12 shows the rear side of the headgear 200, which faces generally backwards (i.e., facing away from the wearer’s front) when worn. The elevation shown in Figure 13 shows the bottom of the headgear, which faces generally downwards (i.e., towards the wearer’s shoulders) when worn. Each earcup 310, 315 of the headgear 200 shown in Figures 12 and 13 comprise a respective control interface 500, 501. The control interface 500 comprises the control elements shown in Figure 11. The further control interface 501 may comprise a further button 521 and two further microphones 511, 512 (one for active noise cancellation, similar to the microphone 510 on the other earcup 315, and the other for telephony).

Claims

1. An earcup for headgear, the headgear for wearing on a wearer’s head, the earcup comprising:a housing to be supported over an ear of the wearer, wherein the housing comprises a protrusion portion;a cover releasably attachable to the housing, wherein the cover comprises a gap portion, and wherein the protrusion portion of the housing projects through the gap portion; anda control interface adapted to generate a control signal for causing control of an operation of the earcup, wherein the control interface is provided on the protrusion portion.

2. The earcup as claimed in claim 1, wherein the housing comprises one or more external surfaces, and wherein the cover covers a majority of the one or more external surfaces of the housing.

3. The earcup as claimed in any preceding claim, wherein the protrusion portion substantially fills the gap portion.

4. The earcup as claimed in any preceding claim, wherein, in use, the protrusion portion sits towards a rear portion of the ear of the wearer.

5. The earcup as claimed in any preceding claim, wherein the control interface is provided proximal to a perimeter of the protrusion portion.

6. The earcup as claimed in any of claims 1 to 5, wherein the control interface comprises one or more sensors.

7. The earcup as claimed in claim 6, wherein the one or more sensors comprise one or more microphone sensors.

8. The earcup as claimed in any of claims 1 to 7, wherein the control interface comprises one or more user input interfaces.

9. The earcup as claimed in any of claims 1 to 8, wherein the control interface comprises one or more input and / or output ports.

10. The earcup as claimed in any of claims 1 to 9, wherein the housing comprises a housing attachment feature, and wherein the cover comprises a cover attachment feature adapted to releasably engage with the housing attachment feature to releasably attach the cover to the housing.

11. The earcup as claimed in claim 10, wherein the cover comprises a first portion and a second portion, the cover attachment feature being provided on or coupled to the first portion, wherein, in use, the first portion is distal to the ear of the wearer when the headgear is worn on the wearer’s head, compared to the second portion that is proximal to the ear of the wearer.

12. The earcup as claimed in claim 11, wherein a length of a perimeter of the first portion is smaller than a length of a perimeter of the second portion.

13. The earcup as claimed in any of claims 11 to 12, wherein a height of a protrusion of the first portion from the second portion is greater than or equal to a height of a protrusion of the protrusion portion from the second portion.

14. The earcup as claimed in any of claims 11 to 13, wherein the housing comprises a protrusion portion, and the first portion defines a socket for receiving the protrusion portion.

15. The earcup as claimed in claim 14, wherein the housing attachment feature is provided on or near to the protrusion portion, and the cover attachment feature is provided within the socket.

16. The earcup as claimed in any of claims 11 to 15, wherein the first portion is coupled to the second portion and rotatable relative to the second portion, wherein the cover attachment feature is adapted to:engage and disengage with the housing attachment feature by rotation of the first portion relative to the housing.

17. The earcup as claimed in claim 16, wherein the cover attachment feature and the housing attachment feature form a bayonet fitting.

18. The earcup as claimed in any of claims 10 to 17, wherein the cover attachment feature and the housing attachment feature define a magnet coupling.

19. The earcup as claimed in any preceding claim, wherein the protrusion portion is arcuate.

20. The earcup as claimed in any preceding claim, wherein the protrusion portion extends around a perimeter of the housing.

21. The earcup as claimed in any preceding claim, wherein an outer edge of the protrusion portion follows a curvature of an outer edge of the cover.

22. A headgear comprising the earcup as claimed in any preceding claim, wherein the headgear further comprises a headband adapted to contact the wearer’s head and adapted to support the housing over the ear of the wearer.

23. The headgear as claimed in claim 22, wherein the headgear comprises a speaker housed by the housing.

24. The headgear as claimed in claim 22 or 23, wherein the headgear comprises: a pair of housings, wherein each housing is to be supported over an ear of the wearer;anda pair of covers, wherein each cover is adapted to be removably attached to a respective housing of the pair of housings.

25. A cover releasably attachable to a housing of an earcup for headgear, the headgear 5 for wearing on a wearer’s head, the cover for partially covering the housing, the housing having a protrusion portion, the earcup comprising a control interface provided on the protrusion portion, the cover comprising:a gap portion for accommodating the protrusion portion of the housing.

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