Abstract
A loudspeaker assembly for on-ear headphones, to be arranged on and/or over the ear, includes a housing in which a woofer is arranged and configured to emit low frequency sound waves along a low frequency sound beam axis toward the wearer's the ear. At least one tweeter is arranged in the housing and configured to emit high frequency sound waves along a high frequency sound beam axis toward the wearer's the ear. The at least one tweeter is a MEMS loudspeaker.
Claims
1. A loudspeaker assembly for on-ear headphones, to be arranged on and/or over an ear of the user, the loudspeaker assembly comprising: a housing; a woofer disposed in the housing and configured to emit low frequency sound waves along a low frequency sound beam axis toward the ear; and a plurality of tweeters disposed in the housing, each of the plurality of tweeters being configured to emit high frequency sound waves along a respective high frequency sound beam axis; and wherein each of the plurality of tweeters is a MEMS loudspeaker and is arranged radially spaced apart from the low frequency sound axis; wherein each of the plurality of tweeters is arranged circumferentially around the woofer and the low frequency sound beam axis; and wherein the housing is configured so that when the loudspeaker assembly is in use as intended on or over an ear of the user, a first number of the plurality of tweeters is arranged in front of the ear and a second number of the plurality of tweeters is arranged behind the ear such that the first number exceeds the second number.
2. The loudspeaker assembly as claimed in claim 1, wherein a first one of the plurality of tweeters is arranged relative to the woofer in such a way that the high frequency sound beam axis intersects the low frequency sound beam axis, in a side view, so that these have a common angle of crossing.
3. The loudspeaker assembly as claimed in claim 2, wherein the angle of crossing is between 100° and 150°.
4. The loudspeaker assembly as claimed in claim 2, wherein the circumferential angle is between 15° and 90°.
5. The loudspeaker assembly according to claim 1, wherein the low frequency sound beam axis and the high frequency sound beam axis are oriented in parallel to one another.
6. The loudspeaker assembly as claimed in claim 1, wherein the high frequency sound beam axis of a first one of the plurality of tweeters is slanted toward the woofer.
7. The loudspeaker assembly as claimed in claim 1, further comprising a cover element, wherein the housing is open on a front face and the cover element is arranged on the open front face to form a cavity with the housing.
8. The loudspeaker assembly as claimed in claim 7, wherein each of the plurality of tweeters is arranged in the cavity.
9. The loudspeaker assembly as claimed in claim 1, wherein a first one of the plurality of tweeters is circumferentially spaced apart from a second one of the plurality of tweeters by identical circumferential angles.
10. The loudspeaker assembly as claimed in claim 1, further comprising a control unit that is configured to operate each of the plurality of tweeters in a normal mode and/or in a stereoscopic sound mode.
11. The loudspeaker assembly as claimed in claim 10, wherein the control unit is designed in such a way that it actuates a first one of the plurality of tweeters in the stereoscopic sound mode in order to generate a sound event that is spatially localizable for a user.
12. The loudspeaker assembly as claimed in claim 10, further comprising an inertial measurement unit coupled to the control unit wherein the inertial measurement unit is configured to detect a spatial orientation and/or a spatial position of the first one of the plurality of tweeters and gather measured values about the spatial orientation and spatial position of the loudspeaker assembly.
13. The loudspeaker assembly as claimed in claim 12, wherein the control unit is configured to adapt the sound event depending on measured values gathered by the inertial measurement unit.
14. The loudspeaker assembly as claimed in claim 1, wherein the woofer is an electrodynamic loudspeaker.
15. The loudspeaker assembly as claimed in claim 1, further comprising: a control unit that is configured to operate a first one of the plurality of tweeters in a stereoscopic sound mode and configured to operate a second one of the plurality of tweeters in a stereoscopic sound mode, wherein the control unit is configured to actuate the first tweeter and the second tweeter to generate a sound event that is spatially localizable for a user.
16. The loudspeaker assembly as claimed in claim 1, further comprising: a control unit that is configured to operate a first one of the plurality of tweeters in a stereoscopic sound mode and configured to operate a second one of the plurality of tweeters in a stereoscopic sound mode, wherein the control unit is configured to actuate the first tweeter and the second tweeter in such a way that the sound waves of the first tweeter interfere with the sound waves of the second tweeter, so that they amplify one another.
17. The loudspeaker assembly as claimed in claim 1, wherein a first one of the plurality of tweeters is circumferentially spaced apart from a second one of the plurality of tweeters by different circumferential angles.
18. Headphones to be arranged on and/or over an ear of the user, the headphones comprising: a loudspeaker assembly that includes a housing, a woofer disposed in the housing and configured to emit low frequency sound waves along a low frequency sound beam axis toward the ear, and a plurality of tweeters disposed in the housing, each of the plurality of tweeters being configured to emit high frequency sound waves along a respective high frequency sound beam axis, wherein each of the plurality of tweeters is a MEMS loudspeaker and is arranged radially spaced apart from the low frequency sound axis; wherein each of the plurality of tweeters is arranged circumferentially around the woofer and the low frequency sound beam axis; and wherein the housing is configured so that when the loudspeaker assembly is in use as intended on or over an ear of the user, a first number of the plurality of tweeters is arranged in front of the ear and a second number of the plurality of tweeters is arranged behind the ear such that the first number exceeds the second number.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
(1) Further advantages of the invention are described in the following exemplary embodiments. Wherein:
(2) FIG. 1 shows a lateral view of a sectional view of an ear of a wearer and a lateral view of a loudspeaker assembly,
(3) FIG. 2 shows a top view of a loudspeaker assembly comprising a woofer and at least one tweeter,
(4) FIG. 3 shows a sectional view of a loudspeaker assembly according to a section line D-D from FIG. 2,
(5) FIG. 4 shows a sectional view according to a section line A-A from FIG. 2,
(6) FIG. 5 shows a sectional view according to a section line B-B from FIG. 2,
(7) FIG. 6 shows a sectional view according to a section line C-C from FIG. 2,
(8) FIG. 7 shows a perspective view of the loudspeaker assembly comprising a woofer and multiple tweeters,
(9) FIG. 8 shows a schematic representation of the loudspeaker assembly in a normal mode,
(10) FIG. 9 shows a schematic representation of the loudspeaker assembly in a stereoscopic sound mode, and
(11) FIG. 10 shows a schematic representation of a positioning of the loudspeaker assembly with respect to the ear.
DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS
(12) FIG. 1 shows a lateral sectional view of an ear 2 of a wearer and a lateral view of a loudspeaker assembly 1 of the type arranged, for example, in a headphone (not shown here). The loudspeaker assembly 1 can be arranged, for example, in an ear cup of the headphone. The ear cup can enclose, for example, the ear 2, so that ambient noise can be muffled.
(13) As shown in FIG. 1, the loudspeaker assembly 1 can have a distance to the ear 2, which can amount to a few centimeters when the headphone is used as intended. Furthermore, the loudspeaker assembly 1 can face the ear 2. A woofer 4 (not shown here) can be arranged in the loudspeaker assembly 1. A low frequency sound beam axis 5 of the woofer 4 can be directed toward the ear 2. When the headphone is used as intended, it is advantageous that the low frequency sound beam axis 5 faces the ear 2, so that low frequency sound waves, which propagate along the low frequency sound beam axis 5, enter the ear 2. Reflectances, defractions, or refractions of the low frequency sound waves can be reduced as a result. In addition, as a result, the output of the woofer 4 can be kept low. As schematically shown in FIGS. 3-6, the low frequency sound beam axis 5 desirably extends from the center of the woofer 4 in a direction that is normal to the plane in which the woofer 4 extends.
(14) The low frequency sound waves have relatively low frequencies. They can have, for example, frequencies in the range from 20 Hz to 1 kHz-2 kHz. Due to the long wavelength associated with the low frequency, a wearer cannot localize or can only poorly localize a point of origin of the low frequency sound waves.
(15) In order to be able to localize a point of origin of a (virtual) sound event, for example, of an instrument in an orchestra, the loudspeaker assembly 1 comprises at least one tweeter 6 (not shown in FIG. 1). With the aid of the tweeter 6, high frequency sound waves having a frequency of, for example, 1 kHz-2 kHz to 20 kHz-30 kHz can be generated. In this frequency range, a wearer of the headphone can localize the point of origin of the sound event.
(16) Since a human ear 2 is shown in FIG. 1, the orientation designations top, bottom, right, left, front, and back are to be used, for the sake of simplicity, for the description of the figures, when doing so is useful for the explanation of the invention. The ear 2 can be arranged in space, in this case, in the way it is arranged with respect to a person, the wearer, who is standing or is sitting upright. Furthermore, FIG. 1 shows a horizontal H, which can be utilized as a reference plane. When the headphone is used as intended, and when the wearer is standing or is sitting upright, the horizontal H can be parallel to a horizontal of the surroundings. Such references to the surroundings are intended merely to simplify the explanation of the invention.
(17) The tweeter 6 can emit high frequency sound waves along a high frequency sound beam axis 7. As schematically shown in FIGS. 3-6, the high frequency sound beam axis 7 desirably extends from the center of the tweeter 6 in a direction that is normal to the plane in which the tweeter 6 extends. According to the exemplary embodiment shown in FIG. 1, the woofer 4 is arranged so that the low frequency sound beam axis 5 points directly into the ear canal, and the tweeter 6 is arranged above the ear 2 so that the high frequency sound beam axis 7 is parallel to and vertically above the low frequency sound beam axis 5. The wearer can therefore be given the impression that the sound event was above him/her. Additionally or alternatively, at least one further tweeter 6 can also be arranged below the ear 2. As a result, sound events that have taken place below the ear 2 of the wearer can be localized. Moreover, even more tweeters 6 can be arranged in the loudspeaker assembly 1, of course, in order to depict sound events that have taken place in front of and/or behind the wearer.
(18) As schematically shown in FIG. 2, the tweeter 6 is radially spaced apart from the woofer 4. Furthermore, as schematically shown in FIG. 1, the high frequency sound beam axis 7 can be oriented in parallel to the low frequency sound beam axis 5.
(19) FIG. 2 shows a top view of a loudspeaker assembly 1 comprising a woofer 4 and at least one tweeter 6. In the present exemplary embodiment from FIG. 2, the loudspeaker assembly 1 comprises seven tweeters 6a through 6g.
(20) The woofer 4 is situated centrally in the loudspeaker assembly 1. The low frequency sound beam axis 5 is not shown in FIG. 2. It is directed out of and normal to the plane of the drawing. Additionally or alternatively, the high frequency sound beam axes 7 (not shown here) of the particular tweeters 6a through 6g can also be directed out of and normal to the plane of the drawing.
(21) Furthermore, as schematically shown in FIGS. 2-7, a cover element 8 is arranged in a housing 3. The cover element 8 comprises a window section 9, through which the low frequency sound waves of the woofer 4 can exit the housing 3. The woofer 4 can be arranged coaxially with the window section 9. In particular, the low frequency sound beam axis 5 can also be arranged coaxially with the window section 9.
(22) The high frequency sound beam axes 7 of the particular tweeters 6a through 6g can be arranged perpendicularly to the cover element 8. Additionally or alternatively, the low frequency sound beam axis 5 can also be arranged perpendicularly to the cover element 8.
(23) As schematically shown in FIGS. 2 and 7, the cover element 8 also comprises at least one outlet passage 10. In the present exemplary embodiment from FIG. 2, the cover element 8 comprises multiple outlet passages 10, wherein only one outlet passage 10 is provided with a reference character, for the sake of simplicity. According to the present exemplary embodiment, one outlet passage 10 is assigned to each tweeter 6a through 6g. Through the outlet passage 10, the high frequency sound waves of the tweeters 6a through 6g can exit through the cover element 8 and out of the housing 3.
(24) Moreover, as schematically shown in FIGS. 2 and 7, the cover element 8 comprises multiple openings 11, wherein only one opening 11 is provided with a reference character, for the sake of simplicity. With the aid of the openings 11, for example, a pressure compensation can take place between a cavity 12 in the housing 3 and the surroundings.
(25) The tweeters 6a through 6g are arranged spaced apart from one another circumferentially around the woofer 4. As schematically shown in FIG. 2, the tweeters 6a through 6g are spaced apart from one another by a circumferential angle α, β, γ. As schematically shown according to FIGS. 1 and 2, a reference plane H is defined and disposed with respect to the orientation of the loudspeaker assembly 1. The horizontal plane H can be arranged, for example, in the headphone in such a way that, when the headphone is used as intended, the horizontal plane H is also oriented horizontally with respect to the surroundings. The tweeter 6g can therefore be arranged, for example, above the ear 2.
(26) For example, the circumferential angle α can be formed between the tweeters 6g and 6f. Moreover, the circumferential angle β can be formed between the tweeters 6a and 6e. Furthermore, the circumferential angle γ can be formed between the tweeters 6d and 6f. The circumferential angles α, β, γ can be in a range between 15° and 90°. The smaller the circumferential angles α, β, γ are, the more precisely can the direction of the sound event be localized.
(27) In addition, as schematically shown in FIG. 2, the tweeters 6a through 6g can have a radial distance R to the woofer 4, in particular to the low frequency sound beam axis 5. For the sake of simplicity, only the tweeter 6g is shown with the radial distance R. For example, the tweeters 6a through 6d have a shorter radial distance R to the woofer 4 than the tweeter 6g. According to the present exemplary embodiment, the tweeters 6a through 6d are arranged adjacent to the window section 9. In particular, the outlet passages 10 of the tweeters 6a through 6d can adjoin the window section 9.
(28) A control unit 14 shown schematically in FIGS. 8 and 9) can actuate the tweeters 6a through 6g in various ways in order to generate a 3D tone. In this way, the tweeters 6a through 6g can be operated by the control unit 14 in a normal mode schematically represented in FIG. 8 and in a stereoscopic sound mode schematically represented in FIG. 9. In the stereoscopic sound mode, the control unit 14 can actuate only one or a few tweeters 6a through 6g, so that the high frequency sound waves reach the ear 2 from only one direction. As a result, a certain localizability of the sound event is already established. The control unit 14 can also actuate the tweeters 6a through 6g according to a wave field synthesis, however. Virtual acoustic surroundings can be created with the aid of the wave field synthesis. For this purpose, the control unit 14 can actuate a few tweeters 6a through 6g in such a way that an acoustic wave field is formed by the tweeters 6a through 6g, which corresponds to that of a real sound event or at least comes close thereto. In the process, the sound waves from various tweeters 6a through 6g can interfere with one another, so that they cancel each other out and/or amplify one another. As a result, an acoustic wave field can be generated, which gives the impression that the sound event reaches the ear 2 from a certain direction.
(29) Furthermore, according to the present exemplary embodiment from FIG. 2, the tweeters 6e and 6f can lie on the horizontal reference plane H. When the headphone comprising the loudspeaker assembly 1 is worn as intended, for example, a sound event that arose in front of and/or behind the ear 2 can be localized with the aid of the two tweeters 6e, 6f.
(30) With the aid of the tweeter 6g, for example, a sound event that took place above the ear 2 can be localized. A sound event that took place, for example, obliquely underneath can be represented with the aid of the tweeter 6c. A sound event that took place, for example, obliquely overhead can be represented with the aid of the tweeter 6d. A sound event that took place obliquely overhead and/or obliquely underneath can be represented with the aid of the two tweeters 6a, 6b.
(31) FIGS. 3, 4, 5, 6 each show a sectional view of the loudspeaker assembly 1 according to the lines of planes A-A, B-B, C-C and D-D cut from FIG. 2.
(32) The housing 3 shown in FIGS. 3, 4, 5, 6 is open on a front face 13. The housing 3, which is open on the front face 13, can be closed with the aid of the cover element 8. The housing 3 and the cover element 8 delimit a cavity 12 in the housing 3. The woofer 4 can be arranged in the cavity 12. The cavity 12 can act, for example, as a resonant cavity for the woofer 4. The cavity 12 can also be a back volume of the woofer 4. Additionally or alternatively, the at least one tweeter 6 can also be arranged in the cavity 12.
(33) The cover element 8 comprises the window section 9 in a central region. The window section 9 and the woofer 4 can be arranged coaxially with one another. The window section 9 can also be arranged coaxially with the low frequency sound beam axis 5. The window section 9 can be curved outwardly, away from the cavity 12, in the region of the woofer 4.
(34) According to the woofer 4 shown in FIGS. 3, 4, 5, 6, the woofer 4 can be designed as an electrodynamic loudspeaker.
(35) The tweeters 6, which can be designed as MEMS loudspeakers, are also shown. One advantage of MEMS loudspeakers is that they can be designed to be small. Furthermore, the MEMS loudspeaker has a low total harmonic distortion. Sound waves having low distortion can be reproduced with the aid of the MEMS loudspeaker. Furthermore, a broad frequency spectrum can be covered with the aid of the MEMS loudspeaker.
(36) FIG. 3 shows the section along the line of cut D-D from FIG. 2. According to FIG. 3 and FIG. 2, the tweeter 6 is arranged in such a way that its high frequency sound beam axis 7 is oriented in parallel to the low frequency sound beam axis 5 of the woofer 4. As a result, the high frequency sound waves can be emitted along the high frequency sound beam axis 7 toward the ear 2. The human ear gets the impression that a sound event has taken place above the ear 2.
(37) According to the FIGS. 4, 5, 6, the at least one tweeter 6 is arranged in relation to the woofer 4 in such a way that its high frequency sound beam axis 7 intersects the low frequency sound beam axis 5 in the sectional view shown here. The high frequency sound beam axis 7 has an angle of crossing δ, ε, ζ with respect to the low frequency sound beam axis 5.
(38) FIG. 4 shows the section along the line of cut A-A from FIG. 2. According to FIG. 4, the angle of crossing δ can be 90°. The high frequency sound beam axis 7 is therefore perpendicular to the low frequency sound beam axis 5. The high frequency sound waves of the tweeter 6 can also interfere with other high frequency sound waves, however, in order to form an acoustic wave field. A sound event that originates from above the ear 2 can be generated with the aid of the tweeter 6.
(39) FIG. 5 shows the section along the line of cut B-B from FIG. 2. According to FIG. 5, the angle of crossing ε can be 110°. The high frequency sound waves can then be emitted along the high frequency sound beam axis 7 in the direction of the ear 2.
(40) FIG. 6 shows the section along the line of cut C-C from FIG. 2. According to FIG. 6, the angle of crossing ζ can also be in the range of 120°. The high frequency sound waves can then be emitted along the high frequency sound beam axis 7 in the direction of the ear 2.
(41) An intersection point of the high frequency sound beam axes 7 with the low frequency sound beam axis 5 shown according to FIGS. 4, 5, 6 does not need to be arranged in front of the ear 2. The intersection point can also be arranged behind the ear 2, i.e., within the head.
(42) FIG. 7 shows a perspective view of the loudspeaker assembly 1. The features are known from the preceding figures, so that an explanation of FIG. 7 will be dispensed with.
(43) A loudspeaker assembly 1 comprising the above-described control unit 14 is schematically represented in FIGS. 8 and 9. The loudspeaker assembly 1 can be designed according to one or more of the aforementioned exemplary embodiments, wherein the aforementioned features can be present individually or in any combination. In particular, the loudspeaker assembly can comprise multiple tweeters 6a through 6g designed as MEMS loudspeakers. These can all—or individually—have the angles of crossing δ, ε, ζ described in FIGS. 4 through 6.
(44) In all aforementioned exemplary embodiments, the control unit 14 is designed in such a way that it can operate the tweeters 6a through 6g in a normal mode (cf. FIG. 8) and/or in a stereoscopic sound mode (cf. FIG. 9). In the normal mode, spatial localization of a sound event by the user is not possible. Accordingly, the normal mode is suitable for usual applications, such as listening to music. The stereoscopic sound mode can be utilized, in particular, in the case of image-based applications, such as computer games, motion pictures, or concert recordings. The stereoscopic sound mode makes it possible for the user to perceive sound events based on direction and/or space, i.e., in particular, a 3D stereoscopic sound.
(45) For this purpose, the control unit 14 is designed in such a way that it simultaneously actuates all tweeters 6a through 6g in the normal mode. Therefore, a voluminous sound experience coming from all directions can be generated.
(46) In the stereoscopic sound mode represented in FIG. 9, only one of the tweeters 6a through 6g and/or only a portion of the tweeters 6a through 6g can be actuated simultaneously by the control unit 14, so that a sound event can be generated, which can be spatially localized by the user and is indicated in FIG. 9 with the aid of the arrow. Advantageously, for this purpose, at least the tweeter 6a through 6g located in an angular interval corresponding, in the circumferential direction, to the direction of sound, i.e., according to the figure, the two tweeters 6a through 6g located in the lower right, is actuated by the control unit 14. Additionally or alternatively, it is advantageous when multiple or all tweeters can be actuated by the control unit 14 in the stereoscopic sound mode in such a way that the sound waves from various tweeters 6a through 6g interfere with one another, so that they cancel each other out and/or amplify one another, in order to generate the stereoscopic sound experience.
(47) In an exemplary embodiment schematically represented in FIG. 9, the loudspeaker assembly 1 comprises an inertial measurement unit 15, in particular a gyroscope and/or an acceleration sensor, coupled to the control unit 14. This is preferably designed in such a way that, with the aid thereof, a spatial orientation and/or a spatial position of the loudspeaker assembly 1 can be detected. Advantageously, the control unit 14 is designed in such a way that, with the aid thereof, the sound event, which can be spatially localized by the user, can be adapted depending on the measured values gathered by the inertial measurement unit 15.
(48) FIG. 10 shows a schematic representation of a positioning of the loudspeaker assembly 1 with respect to the ear 2. According to the present exemplary embodiment, the ear 2 is shown from the outside, wherein the loudspeaker assembly 1 is arranged over the ear 2. FIG. 10 therefore shows an example of a positioning of the loudspeaker assembly 1 with respect to the ear 2 of a listener during use as intended. The viewing direction is from the outside onto the loudspeaker assembly 1 and onto the ear 2. The horizontal reference plane H is also shown in FIG. 10.
(49) According to the present exemplary embodiment, the loudspeaker assembly 1 comprises multiple woofers 4a, 4b. The first woofer 4a is represented in FIG. 10 as a circle formed by a dotted line and is arranged over the ear 2 when the loudspeaker assembly 1 is positioned as intended. When the loudspeaker assembly 1 is used as intended, the woofer 4a is arranged coaxially with the ear 2 or an ear canal of the ear 2. As a result, the low frequency sound beam axis is oriented coaxially with the ear 2 and with the ear canal. The low frequency sound beam axis is not shown here. It is perpendicular to FIG. 10. It extends into the plane of the drawing. The low frequency sound waves generated by the woofer 4a therefore enter, in particular directly, the ear canal and, therefore, reach the tympanic membrane.
(50) According to the present exemplary embodiment, the loudspeaker assembly 1 comprises a second woofer 4b. This woofer 4b is arranged in front of the ear 2 when the loudspeaker assembly 1 is positioned or arranged as intended. In this case, “front” means the directions “front” and “back”, which are usual for a person. The low frequency sound beam axis 5b is arranged in parallel to the horizontal reference plane H. Additionally or alternatively, the low frequency sound beam axis of the first woofer 4a and the low frequency sound beam axis 5b of the second woofer 4b are oriented perpendicularly to one another. The second woofer 4b can also be arranged in the loudspeaker assembly 1 in such a way, however, that the low frequency sound beam axis 5b of the second woofer 4b is slanted toward the ear 2, so that the low frequency sound waves enter the ear 2 obliquely from the front.
(51) Additionally or alternatively, a woofer 4 (not shown here) can also be arranged behind the ear 2. This woofer 4 can be arranged behind the ear 2 as a mirror image of the second woofer 4b (shown here) with respect to a center line of the loudspeaker assembly 1. The woofer 4 (not shown here) can be arranged in the loudspeaker assembly 1 in the same manner as the second woofer 4b, although not in front of the ear 2 but rather behind the ear 2.
(52) Moreover, the loudspeaker assembly 1 from FIG. 10 comprises a plurality of tweeters 6a through 6f. According to the present exemplary embodiment, in particular all tweeters 6a through 6f are spaced apart from the horizontal reference plane H. Moreover, the tweeters 6a through 6f are arranged at an angle with respect to one another.
(53) Advantageously, at least a portion of the high frequency sound beam axes 7 and/or of the low frequency sound beam axes 5 can intersect at an intersection point K. The intersection point K can also be an intersection line. As a result, at least a portion of the high frequency sound beam axes 7 and/or of the low frequency sound beam axes 5 extend through the intersection line K.
(54) According to the present exemplary embodiment, the high frequency sound beam axes 7a through 7f of the tweeters 6a through 6f intersect at the intersection point K. Additionally or alternatively, the low frequency sound beam axis 5b of the second woofer 4b and/or the low frequency sound beam axis (not shown here) of the first woofer 4a can also extend through the intersection point K. As a result, according to the present exemplary embodiment, all sound axes—whether they are low frequency sound beam axes 5 or high frequency sound beam axes 7—intersect at an intersection point K. The sound transducers—whether they are woofers 4 or tweeters 6—can be arranged in the loudspeaker assembly 1 in such a way that the intersection point K is located over the ear 2 when the loudspeaker assembly 1 is positioned as intended. As a result, for example, a stereoscopic sound can be generated, which is not distorted or only slightly distorted.
(55) According to the present exemplary embodiment, the four tweeters 6a through 6d are arranged in front of the ear 2 and the two tweeters 6e, 6f are arranged behind the ear 2. It is advantageous when more tweeters 6 are arranged in front of the ear 2 than behind the ear 2. Since most virtual sound events take place in front of the user during normal use of the loudspeaker assembly 1, it is advantageous when more tweeters 6 and/or woofers 4 are arranged in front of the ear 2 (normally, for example, in the case of a virtual reality application, the user looks at the event generating the virtual sound event, so that it is in front of the user).
(56) According to the present exemplary embodiment, the tweeters 6a through 6f and the second woofer 4b are arranged on a circle formed by a dotted line, having the radius R, shown in FIG. 10. This means, the tweeters 6a through 6f and the second woofer 4b all have the same distance to the centrally arranged first woofer 4a. Since the first woofer 4a is arranged directly over the ear 2, the tweeters 6a through 6f and the second woofer 4b all have the same distance to the ear 2. This distance is precisely the radius R of the circle. The distance is also the radial distance R. As a result, the propagation times of the sound waves of the tweeters 6a through 6f and of the second woofer 4b to the ear 2 are equal to each other. Additionally or alternatively, the first woofer 4a can also have the radius R or the radial distance R to the ear 2. As a result, all sound transducers—whether they are woofers 4 or tweeters 6—can have the same distance to the ear 2. All sound transducers, whether they are woofers 4 or tweeters 6, can therefore be arranged in the loudspeaker assembly 1 in a bowl-shaped manner, in particular, a spherical bowl-shaped manner. As a result, in the case of a positioning of the loudspeaker assembly 1 over the ear 2 as intended, all sound transducers have the same distance to the ear 2, so that all sound waves reach the ear 2 at the same time or have the same propagation time to the ear 2 with respect to one another.
(57) The present invention is not limited to the represented and described exemplary embodiments. Modifications within the scope of the claims are also possible, as is any combination of the features, even if they are represented and described in different exemplary embodiments.
LIST OF REFERENCE CHARACTERS
(58) 1 loudspeaker assembly 2 ear 3 housing 4 woofer 5 low frequency sound beam axis 6 tweeter 7 high frequency sound beam axis 8 cover element 9 window section 10 outlet passage 11 openings 12 cavity 13 front face 14 control unit α, β, γ circumferential angle δ, ε, ζ angle of crossing H horizontal R radial distance K intersection point
