Line source loudspeaker device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- AYDI DISTRIBUTION PLC
- Filing Date
- 2021-07-30
- Publication Date
- 2026-06-05
Smart Images
Figure CN116250250B_ABST
Abstract
Description
Invention Field
[0001] This invention relates to line-source loudspeaker devices. background
[0002] Concerts, music festivals, and other performances are musical experiences where thousands of audience members gather in a very large venue to enjoy a musician's performance. The music composed by the musician is typically amplified here using a Public Address (PA) system. Depending on the type of performance, the requirements for the PA system differ. The first requirement is quantitative and involves producing an appropriate sound level. However, controlling the sound level in a concert or music festival is not a major problem. The second requirement is quantitative, more specifically, that all audience members can clearly hear the sound produced by the PA system. PA systems typically consist of multiple loudspeakers, each emitting sound waves. These sound waves interfere with each other. Due to this interference, the produced sound is not clearly audible everywhere, often resulting in a suboptimal audience experience. To prevent interference between different sound sources, so-called vertical line arrays of loudspeakers are installed in concerts and music festivals. These arrays emit uniform sound waves to the audience with virtually no interference. A vertical line array consists of multiple mutually coupled line source loudspeakers. Vertical line arrays solve interference relatively well but have complex limitations. Besides the challenge of creating a sufficiently long array to control the lower frequency range within the middle range of a line array, line arrays also present the problem of transmitting qualitative sound in the areas directly above and below the array. Existing line arrays cannot produce the clear sound provided by high-quality single-driver amps or some two-way or three-way amps. Therefore, line arrays are not suitable for smaller spaces. Thus, the use of line arrays is problematic in small spaces or spaces with poor acoustics. Line arrays are also more expensive, so they are not readily chosen for smaller performances, such as recitals. Invention Overview
[0003] The purpose of embodiments of the present invention is to provide a line-source loudspeaker device that can be applied to a wider range of environments.
[0004] To this end, the present invention provides a line source loudspeaker device that can be positioned at a first position and a second position, wherein the first position is substantially orthogonal to the second position. The line source loudspeaker device includes a housing housing on which a first loudspeaker and one or more second loudspeakers are disposed on each side of the first loudspeaker. The first loudspeaker is configured to emit high frequencies, and the one or more second loudspeakers are configured to emit low frequencies, wherein each of the first loudspeaker and the one or more second loudspeakers includes a driver and a corresponding loudspeaker output, wherein each driver emits a substantially spherical sound wave and is connected to the corresponding loudspeaker output. The loudspeaker outputs of the first and second loudspeakers together form a combined loudspeaker output of the line source loudspeaker device. The line source loudspeaker device also includes an acoustic waveguide disposed between the combined loudspeaker output of the line source loudspeaker device and the first loudspeaker. The acoustic waveguide is configured to guide the sound wave emitted by the first loudspeaker on a constant wave path defined by the acoustic waveguide, such that the initial spherical sound wave can be converted into a substantially rectangular isophase sound wave that constructively interferes with the sound waves of the one or more second loudspeakers, thereby forming a substantially cylindrical sound wave together. The acoustic waveguide can also rotate about an axis coaxial with the driver of the first loudspeaker, so that in the first and second positions of the in-line loudspeaker device, the cylindrical acoustic wave propagates only in a substantially horizontal direction.
[0005] Because line-source loudspeaker devices can be positioned according to a first position and a second position, they can be used in a wide range of environments. This allows the line-source loudspeaker device to be used, for example, in a line array in the first position, thus for large concerts, and in the second position as a column loudspeaker for smaller performances, such as recitals. The acoustic waveguide can also rotate about its axis, such that in both the first and second positions, the cylindrical sound waves propagate only in the horizontal direction. In other words, the acoustic waveguide restricts the vertical spread of the sound waves. In the first position, the longitudinal direction of the line-source loudspeaker device is preferably substantially parallel to the horizontal direction. Its advantage is based on the understanding that the wavefront of the cylindrical sound wave initially emitted by the line-source loudspeaker device extends wider in the first position than in the second position. This is advantageous for using line-source loudspeaker devices in line arrays. In the second position, the initial wavefront is narrower than in the first position. Because the acoustic waveguide is rotatable and also restricts the vertical spread of the wavefront in the second position, the generated sound waves can be heard more clearly in a smaller space. Therefore, the line-source loudspeaker device achieves optimal sound quality in both positions for different positioning and different purposes. Therefore, line source loudspeaker equipment can be used for small-scale performances and large concerts, for example, in the form of a line array.
[0006] The acoustic waveguide preferably includes an internal reflector and an acoustic waveguide housing, the acoustic waveguide housing surrounding the internal reflector at a certain distance to form a channel extending between an acoustic wave inlet and an acoustic wave outlet, wherein the internal reflector and the acoustic waveguide housing are configured such that the propagation time of the acoustic wave through the acoustic waveguide is substantially constant.
[0007] The acoustic waveguide housing preferably includes an outer wall configured to achieve substantially identical reflections of sound waves from at least one second speaker in both a first and a second position. By rotating the acoustic waveguide, particularly when the driver of at least one of the plurality of second speakers is arranged at an angle relative to the first speaker, the wavepath for the sound waves emitted by at least one second speaker may differ in the first and second positions of the acoustic waveguide. This results in a considerable phase and volume difference in the emitted sound waves, achieving suboptimal sound characteristics. By configuring the outer wall of the acoustic waveguide housing such that the reflections of sound waves from at least one second speaker are substantially identical in both the first and second positions of the acoustic waveguide, the phase and volume differences are almost nonexistent. The outer wall further preferably includes at least a first reflective surface and a second reflective surface configured to be at substantially the same distance from at least one second speaker in the first and second positions, respectively.
[0008] Preferably, the output of the combined loudspeaker includes an opening at least at the location of the acoustic waveguide. In this way, the acoustic waveguide is easily accessible so that it can be easily, manually, and without tools rotated without removing the typical front wall of a line-source loudspeaker device.
[0009] The first loudspeaker is preferably configured to emit sound waves at a frequency of 500 Hz and higher, more preferably 650 Hz and higher, more preferably 800 Hz and higher, and most preferably 900 Hz and higher. Tests have shown that problematic sound interference occurs between different loudspeakers when emitting sound waves at 500 Hz. Because the first loudspeaker is configured to emit sound waves at a frequency higher than 500 Hz, the rotatable acoustic waveguide is used optimally. This further improves the sound quality for the listener.
[0010] One or more second loudspeakers are further preferably configured to emit sound waves with a frequency of 500 Hz or lower, preferably 650 Hz or lower, more preferably 800 Hz or lower, and most preferably 900 Hz or lower.
[0011] The line-source loudspeaker device further preferably includes a first mounting system configured to mount the line-source loudspeaker device in a first position and a second mounting system configured to mount the line-source loudspeaker device in a second position. This allows the line-source loudspeaker device to be advantageously mounted in both positions.
[0012] The first mounting system is further preferably configured to be coupled to a corresponding mounting system of an adjacent line-source loudspeaker device. Thus, multiple line-source loudspeaker devices can be coupled to form an advantageous line array.
[0013] The line-source loudspeaker device further preferably includes handles disposed on opposite sides of the housing, wherein a second mounting system is integrally formed with one of the handles. Because the handles are arranged on opposite sides of the line-source loudspeaker device, the center of gravity of the line-source loudspeaker device is located between the handles, thereby allowing the user to manipulate, rotate, and / or position the line-source loudspeaker device in a simpler manner. Because the second mounting system is integrally formed with one of the handles, the line-source loudspeaker device can be further mounted in a second position in a simple manner.
[0014] Preferably, the driver of at least one of the plurality of second speakers is arranged at an angle relative to the first speaker.
[0015] The angle is further preferably at least 15°, more preferably at least 25°, and more preferably at least 35°.
[0016] One or more second loudspeakers are preferably arranged symmetrically within the housing with respect to the propagation plane of the emitted sound waves. This allows for further prevention of mutual interference between the multiple loudspeakers.
[0017] The propagation plane is preferably substantially aligned with the central axis of the first loudspeaker.
[0018] In the first position, the line source speaker device is preferably used in a line array, while in the second position, the line source speaker device is preferably used as a column speaker.
[0019] The second aspect relates to a line array comprising a plurality of line source loudspeakers as described above.
[0020] The third aspect involves using the line source loudspeakers described above as column loudspeakers and / or in line arrays.
[0021] The fourth aspect relates to a system comprising one or more line source speaker devices as described above and a control unit configured to control each of the one or more line source speaker devices, wherein the control unit includes a wireless transmitter, and each of the one or more line source speaker devices includes a wireless receiver, such that each of the one or more line source speaker devices can be controlled wirelessly by the control unit, preferably via low-latency Bluetooth broadcast. The control preferably includes at least one or a combination of: controlling the sound level of each line source speaker device, controlling sound quality, monitoring data, and predicting sound quality at a location in an area surrounding the one or more line source speaker devices, wherein the control unit further includes a computer-readable storage medium storing instructions configured to cause the control unit to perform one or more of the following steps: controlling the sound level of each line source speaker device, controlling sound quality, monitoring data, and predicting sound quality at a location in an area surrounding the one or more line source speaker devices. Brief description of the attached diagram
[0022] The above and other advantageous features and objects of the present invention will become more apparent when read in conjunction with the accompanying drawings and the following detailed description, and the invention will be better understood, wherein:
[0023] Figure 1 An embodiment of a line-source loudspeaker device is schematically illustrated;
[0024] Figure 2A and Figure 2B The line-source loudspeaker device is schematically shown in the first and second positions;
[0025] Figure 3 An exploded view of another embodiment of the line-source loudspeaker device is shown; and
[0026] Figure 4 A perspective view of the first and second speakers is shown.
[0027] Figure 5 A perspective view of an acoustic waveguide according to a preferred embodiment is shown;
[0028] Figure 6 It shows that according to Figure 5 The cross-section of the acoustic waveguide, as seen along the transverse direction of the acoustic waveguide outlet;
[0029] Figure 7 An exploded view of an acoustic waveguide according to another preferred embodiment is shown;
[0030] Figure 8A and Figure 8B They respectively showed according to Figure 4A top view of the line source speaker device in the first and second positions, wherein the sound wave reflection of the second speaker is indicated;
[0031] Figure 8C It shows that it has the following characteristics: Figure 5 A top view of a line-source loudspeaker device with an acoustic waveguide;
[0032] Figure 9A and Figure 9B Indicates according to Figure 4 The acoustic results of the line source loudspeaker device at the first and second positions;
[0033] Figure 10A and Figure 10B Indicates having a basis Figure 5 The acoustic results of the line source loudspeaker device in the first and second positions.
[0034] Identical or similar elements are indicated by the same reference numerals in the accompanying drawings. Detailed Implementation Examples
[0035] The invention will now be further described based on exemplary embodiments shown in the accompanying drawings.
[0036] Figure 1 An exemplary embodiment of a line-source loudspeaker device 100 is schematically illustrated. The line-source loudspeaker device includes a housing 110. The housing 110 forms a loudspeaker enclosure, which is configured to emit sound waves from the outlet side W3 of the loudspeaker enclosure.
[0037] The housing 110 is provided with a first speaker 200 and one or more speakers 300. Each of the first speaker 200 and the second speaker 300 includes a corresponding driver 210, 310 and a corresponding speaker output 220, 320. The speaker outputs 220, 320 of the first speaker 200 and the second speaker 300 are directly connected to the corresponding drivers 210, 310. The drivers 210, 310 are configured to generate sound waves, and the speaker outputs 220, 320 are configured to direct the generated sound waves in space, for example, to one or more listeners. The drivers 210, 310 are point source type. This means that the drivers 210, 310 generate spherical sound waves. In the context of this application, a spherical sound wave is a sound wave that propagates in all directions. This is understood to mean that the sound wave propagates in a similar manner in all directions. This is clearly a theoretical approach, and in practice, the drivers 210 and 310 of the first and second loudspeakers must be considered as approximations of point sources because drivers 210 and 310 have finite dimensions and the aforementioned characteristics must be explained in a meticulous manner. Drivers 210 and 310 here essentially conform to the inverse square law, where the sound pressure level (SPL) of the emitted sound wave decreases inversely proportional to the square of the distance to the driver. Such drivers have been known for a long time and are generally reliable and inexpensive.
[0038] The first loudspeaker 200 is preferably centrally positioned relative to the outlet side W3, wherein the distance between the driver 210 of the first loudspeaker 200 and the two opposing housing walls W1, W2 adjacent to the driver 210 is equidistant. One or more second loudspeakers 300 are also arranged on each side of the first loudspeaker 200. The second loudspeakers 300 are preferably arranged at substantially the same distance from the first loudspeaker 200. Therefore, the first loudspeaker 200 and the second loudspeakers 300 are symmetrically positioned relative to the outlet side W3. The first loudspeaker 200 and one or more second loudspeakers 300 are arranged such that the corresponding loudspeaker output points towards the outlet side of the housing 110. Figure 1 In the illustrated embodiment, one or more second loudspeakers 300, particularly their drivers 310, are arranged at an angle relative to the driver of the first loudspeaker 200. The angle between the driver of the first loudspeaker 200 and the drivers of the plurality of second loudspeakers is at least 15°, preferably at least 25°, and more preferably at least 35°. Because the respective drivers of the first and second loudspeakers are arranged at an angle relative to the driver of the first loudspeaker 200, space is saved in the housing, thereby making the housing 100 more compact and lighter.
[0039] The line-source loudspeaker device 100 also includes an acoustic waveguide 400. The acoustic waveguide 400 is disposed between the outlet side W3 and the first loudspeaker 200. Specifically, the acoustic waveguide is disposed between the loudspeaker output terminal 220 of the first loudspeaker 200 and the combined loudspeaker output terminal of the line-source loudspeaker device 100. The acoustic waveguide 400 is configured to guide the sound waves generated by the first loudspeaker 200 in a constant wave path, such that the initial spherical sound waves can be converted into substantially rectangular equiphase sound waves that constructively interfere with the sound waves of the second loudspeaker 300, thus forming substantially cylindrical sound waves together. In other words, the diffusion of the sound waves generated by the first loudspeaker 200 is restricted in the height direction, or in other words, in the substantially vertical direction. The inverse square law states that in the case of a point sound source in a free field, doubling the distance from the point sound source will reduce the sound level by 6 dB. Due to the restriction of the sound waves in the substantially vertical direction, the inverse square law no longer applies. Theoretically, the line-source loudspeaker device therefore has a sound level reduction of only 3 dB. The wave path is defined by the acoustic waveguide 400. The wave path is formed, for example, by a channel extending through the acoustic waveguide 400. The acoustic waveguide 400 is rotatable about an axis A coaxial with the driver 210 of the first loudspeaker 200. This allows for alteration of the orientation of rectangular isotropic acoustic waves.
[0040] Figure 2A and Figure 2B The diagram shows that the line-source speaker device 100 can be positioned in a first position and a second position. Figure 2A In the middle, the line-source loudspeaker device 100 is positioned in the first position. Figure 2B In this configuration, the line-source loudspeaker device 100 is positioned in a second position. The second position is substantially orthogonal to the first position. Figure 2A and Figure 2B Specifically shown is an acoustic waveguide emitting a rectangular equiphase acoustic wave G. In a first position, the line source loudspeaker device has a lying orientation, and in a second position, it has a standing orientation. In the first position, the line source loudspeaker devices can be connected to adjacent line source loudspeaker devices to form a line array. In the second position, the line source loudspeaker device 100 can be used as a column loudspeaker. As described above, the acoustic waveguide 400 limits the diffusion of the sound waves emitted by the first loudspeaker 200. Figure 2A and Figure 2BIn this context, it is clear that the upright or substantially vertical diffusion of the sound wave G is confined to a height h, which corresponds to the dimension of the outlet side W3 of the line source loudspeaker device. When the line source loudspeaker device moves from a first position to a second position, the acoustic waveguide 400 can rotate about an axis A coaxial with the driver of the first loudspeaker. This allows for a change in the orientation of the substantially rectangular equiphase sound wave (e.g., a lying or upright orientation), such that in both the first and second positions of the line source loudspeaker device 100, the cylindrical sound wave propagates only in a substantially horizontal direction. The horizontal direction is defined relative to the housing. Figure 2A In the illustrated embodiment, the substantially horizontal direction extends parallel to the longitudinal direction of the line-source loudspeaker device and is perpendicular to the outlet side W3. Figure 2B In the middle, the basic horizontal direction is perpendicular to the longitudinal direction of the line source speaker equipment and the outlet side W3.
[0041] Figure 2A and Figure 2B Further shown is that the housing 110 is preferably elongated, with the outlet side W3 substantially parallel to the longitudinal direction of the housing 110. Viewed transversely to the longitudinal direction, the housing 110 preferably has a trapezoidal peripheral shape. The peripheral shape of the housing 110 is more preferably an isosceles trapezoid in transverse view, with the outlet side forming the lower base (large base) and the rear side opposite the outlet side forming the upper base (small base). This allows sound waves to be efficiently guided to the outlet side W3.
[0042] Figure 3 An exploded view of a line-source loudspeaker device 100 is shown. As described above, the line-source loudspeaker device 100 includes a first loudspeaker 200 and one or more second loudspeakers 300. The line-source loudspeaker device 100 includes a housing 110 formed by six sides W1, W2, W3, W4, W5, and W6. Specifically, the housing includes two lateral sides W1 and W2, a top side W4, a bottom side W5, an outlet side W3, and a rear side W6. The line-source loudspeaker device 100 has a loudspeaker output terminal on its outlet side W3, formed by the respective loudspeaker output terminals of the first loudspeaker 200 and the plurality of second loudspeaker output terminals 300.
[0043] In an exemplary embodiment, the line source speaker device 100 includes first mounting systems 510, 520, 530 and a second mounting system 550. The first mounting systems 510, 520, 530 are configured to mount the line source speaker device in a first position, and the second mounting system 550 is configured to mount the line source speaker device in a second position. The first mounting systems 510, 520, 530, 540 are preferably configured to couple to the corresponding mounting systems of adjacent line source speaker devices. This allows the line source speaker device 100 to be connected to an additional line source speaker device (not shown) at the upper W4 position, thereby forming a line array. Obviously, the additional line source speaker device can also be connected at the lower W5 position, or the additional line source speaker device can be connected to both the upper W4 and lower W5 positions simultaneously.
[0044] The second mounting system 550 is configured to mount a line-source speaker device in a second position. For this purpose, the second mounting system 550 is positioned at the first lateral side W1. However, it is apparent that the second mounting system could be positioned at the second lateral side W2, or the second mounting system 550 could be positioned at both the first and second lateral sides. The second mounting system is preferably configured to receive a portion of a speaker bracket. For this purpose, the second mounting device can be provided with a holder in which a portion of the speaker bracket can be accommodated. This has the advantage that the line-source speaker device can be coupled to the speaker bracket without the use of tools. The holder is configured to surround a support rod of the speaker bracket. The holder preferably defines a space that can accommodate the support rod. This space is further preferably cylindrical.
[0045] The line-source loudspeaker device 100 includes two or more handles 600, which are arranged on opposite sides W1, W2 of the housing 110, preferably on two lateral sides W1, W2 of the housing 110. In this exemplary embodiment, a second mounting system 550 is integrally formed with one of the handles 600. This further simplifies ease of use and makes the line-source loudspeaker device more compact.
[0046] Figure 3 The control device 700 is further shown to be preferably arranged on the rear side W6 of the in-line speaker device 100. The control device 700 is configured to control a first speaker and one or more second speakers.
[0047] Figure 4 It shows Figure 3A perspective detail of the first speaker 200 and the second speaker 300. The first speaker 200 and the second speaker 300 are preferably fixed in a housing using a fixing device 120. The fixing device 120 includes a first fixing member 121 and a plurality of second fixing members 122. The first speaker is fixed at the position of the first fixing member 121. The second speaker is fixed at the position of the corresponding second fixing member 122. The corresponding speaker output terminals 220, 320 of the first speaker and the second speaker are specifically fixed to the first fixing member 121 and the plurality of second fixing members 122, respectively. An acoustic waveguide 400 is connected to the speaker output terminal 220 of the first speaker at the position of the first fixing member. The acoustic waveguide 400 is rotatably arranged on the first fixing member 121. For this purpose, the first fixing member 121 is provided with a groove 123, and the acoustic waveguide 400 is provided with an edge corresponding to the groove 123. The edge is slidable within the groove 123. The groove 123 and the edge describe a circular path. This allows the acoustic waveguide 400 to rotate about an axis (e.g., ...). Figure 1 (As shown).
[0048] The acoustic waveguide 400 includes an acoustic wave inlet and an acoustic wave outlet 420, wherein the acoustic wave inlet faces the speaker output terminal 220 of the first speaker 210. The acoustic wave outlet 420 includes a diffuser 430 facing the speaker output terminal of the line source speaker device. A channel extends between the acoustic wave inlet and the acoustic wave outlet 420. The channel is configured such that any possible path of sound waves from the acoustic wave inlet to the acoustic wave outlet 420 has the same or substantially the same length. Therefore, during operation, the propagation time of sound waves through the acoustic waveguide 400 is constant, and sound waves are emitted simultaneously at the location of the acoustic wave outlet 420. Thus, the acoustic waveguide enables the conversion of spherical equiphase sound waves generated by the driver of the first speaker into rectangular equiphase sound waves.
[0049] Combination Figure 5 , Figure 6 , Figure 7 The acoustic waveguide 400 is further discussed in Figure 8.
[0050] Figure 5 A perspective view of an acoustic waveguide according to a preferred embodiment is shown. In the above embodiment, the first position and the second position are described relative to the orientation of the line source loudspeaker device 100. More specifically, it will now be apparent that in the first position, the line source loudspeaker device 100 has a lying orientation, see [link to previous section]. Figure 2A Furthermore, in the second position, the line-source speaker device has an upright orientation, see [reference needed]. Figure 2BThe acoustic waveguide rotates about its axis in a corresponding manner, such that the cylindrical acoustic waves propagate only in a substantially horizontal direction at the first and second positions of the line source loudspeaker device 100. More specifically, at the first position of the line source loudspeaker device, the acoustic waveguide has an upright orientation, and at the second position of the line source loudspeaker device, the acoustic waveguide has a lying orientation. In the context of this application, the terms first position and second position may also refer to the position of the acoustic waveguide, although it will now be apparent that the first and second positions of the acoustic waveguide are laterally oriented relative to the first and second positions of the line source loudspeaker device.
[0051] Figure 5 The acoustic waveguide in the second position is shown, wherein, as Figure 4 As shown, the acoustic waveguide has a horizontal orientation. Figure 4 The preferred embodiment of the acoustic waveguide 400 shown is in accordance with... Figure 4 The difference in this embodiment is that the acoustic waveguide housing 410 includes an outer wall 460, which is configured to achieve substantially identical reflections of sound waves from at least one second speaker (not shown) in each of the first and second positions. For this purpose, the outer wall 460 is provided with at least a first reflective surface 411 and a second reflective surface 412. At least the first reflective surface 411... Figure 4 This is also visible in the middle. The inventors have discovered that when the line source speaker device is in the first position, i.e., lying down, and the acoustic waveguide 400 therefore has an upright orientation, i.e., in the middle... Figure 3 In the first position of the acoustic waveguide shown, a considerable phase and volume difference is generated in the emitted sound waves, resulting in suboptimal sound characteristics. By configuring the outer wall 460 of the acoustic waveguide housing 410 such that the reflection of sound waves from at least one second speaker is substantially the same in both the first and second positions of the acoustic waveguide, the phase and volume difference becomes almost non-existent. Figure 8A , Figure 8B , Figure 8C , Figure 9A , Figure 9B , Figure 10A and Figure 10B This further clarifies the situation.
[0052] According to the preferred embodiment shown, the speaker output terminal 220 of the first speaker is formed by the acoustic waveguide housing 410. In other words, the speaker output terminal 220 forms part of the acoustic waveguide housing 410.
[0053] Figure 6 It shows that according to Figure 5 The cross-section of the acoustic waveguide is shown as along the transverse direction of the acoustic waveguide outlet. The acoustic waveguide 400 is shown in the first position, i.e., upright.
[0054] Figure 6The acoustic waveguide 400 is shown to include an acoustic wave inlet 450 and an acoustic wave outlet 420. The acoustic wave inlet 450 is located at the position of the driver 210 of the first loudspeaker (not shown). A basic spherical acoustic wave G is shown at the acoustic wave inlet 450.
[0055] According to a preferred embodiment, the acoustic waveguide 400 includes an inner reflector 440 and an acoustic waveguide housing 410, the acoustic waveguide housing 410 being offset from the inner reflector to form a channel. In other words, the acoustic waveguide housing 410 surrounds the inner reflector 440 at a distance from the inner reflector 440, thereby forming a channel K between the acoustic waveguide housing 410 and the inner reflector 440. The channel K extends from an acoustic wave inlet 450 to an acoustic wave outlet 420. The dimensions of the channel are determined by the acoustic waveguide housing 410 and the inner reflector 440. The inner reflector 440 and the acoustic waveguide housing 410 are configured such that the propagation time of sound waves through the acoustic waveguide is substantially constant. In a preferred embodiment, the inner reflector 440 is conical 441 on one side, with the cone's point pointing towards the acoustic wave inlet 450. The cone is further chamfered at a distance not exceeding halfway between the sound wave inlet 450 and the sound wave outlet, thereby forming two inclined surfaces 412 and 413, which intersect each other at the location of the sound wave outlet 420.
[0056] Figure 7 An exploded view of the acoustic waveguide according to another preferred embodiment is shown. According to this other preferred embodiment, for example, when two second loudspeakers are arranged in a line-source loudspeaker device, a first reflective surface 411 is disposed on each side. According to the illustrated embodiment, the reflective surface 411 can be removably arranged. This allows the reflective surface 411 to be replaced when using other second loudspeakers or when different reflection characteristics are required.
[0057] Figure 8A and Figure 8B They respectively showed according to Figure 4 A top view of a line-source loudspeaker device, wherein the acoustic waveguide is located in a first position and a second position. Figure 8A It shows that according to Figure 4 In one embodiment, the acoustic waveguide is in a lying position. The speaker output 320 is at least partially oriented towards the acoustic waveguide 400 to save space in the housing of the line-source speaker device. Second speakers emit sound waves in the direction of the acoustic waveguide at their speaker output 320 locations, as indicated by the arrows shown in the figure. The emitted sound waves are reflected in the direction of the combined speaker output onto the outer wall of the acoustic waveguide housing, more specifically, at the location of the second reflective surface 412. Figure 8B It shows that according to Figure 4In one embodiment, the acoustic waveguide is in an upright position. The speaker output 320 is at least partially oriented towards the acoustic waveguide 400 to save space in the housing of the line-source speaker device. A second speaker emits sound waves in the direction of the acoustic waveguide at its speaker output 320 location, which is indicated by the arrow shown in the figure. The distance between the speaker output 320 and the acoustic waveguide wall is... Figure 8A The distance between them is much greater. On the one hand, this changes the angle of incidence of the sound waves onto the waveguide. Therefore, the emitted sound waves are reflected differently onto the outer wall of the waveguide housing, and more specifically, onto the second speaker. The sound waves are then reflected again onto the output of the second speaker in the direction of the combined speaker's output. On the other hand, there is also a larger volume of air between the waveguide and the second speaker. This situation produces a considerable phase and volume difference in the emitted sound waves, which makes suboptimal sound characteristics audible. These phase and volume differences are as follows... Figure 9A and Figure 9B As shown. In Figure 9A and Figure 9B In the text, PV1 indicates that when the line source speaker device is installed according to... Figure 8A The phase of the emitted sound waves when configured (i.e., when the acoustic waveguide is in a lying position). SPL1 indicates the phase of the emitted sound waves when the line-source loudspeaker device is in the lying position. Figure 8A During configuration, the sound pressure level (SPL) of the emitted sound waves. Figure 9A and 9B In the text, PV2 indicates that when the line source speaker device is installed according to... Figure 8B The phase of the emitted sound wave when configured (i.e., the acoustic waveguide is in an upright position). SPL2 indicates the phase of the emitted sound wave when the line-source loudspeaker device is in the correct configuration. Figure 8B The sound pressure level (SPL) of the emitted sound wave is measured when the first reflecting surface 111 is not present. Significant differences in SPL and phase can be observed in both cases.
[0058] Figure 8C It shows that it has the following characteristics: Figure 5 A top view of a line-source loudspeaker device with an acoustic waveguide (more specifically, having a first reflective surface 411). It should be noted that in both cases, the line-source loudspeaker device with the first reflective surface 411 can also be configured as follows: Figure 8A Location. More specifically, Figure 8C An embodiment is shown in which the outer wall is configured to achieve substantially identical reflections of sound waves from at least one second speaker in each of a first and a second position. The second position is as follows: Figure 8A As shown. However, in Figure 8CAs can be clearly seen, the outer wall achieves substantially the same sound wave reflection in the first position as it does in the second position. More specifically, the outer wall includes at least a first reflective surface 411 and a second reflective surface 412, which are configured to be at substantially the same distance from at least one second speaker in the first and second positions, respectively. In this way, the air volume between the second speaker and the acoustic waveguide is substantially the same in the first and second positions. Figure 10A and Figure 10B Significantly improved phase and volume characteristics are shown for a line-source loudspeaker device with an acoustic waveguide having a first reflective surface 411. (Compared to...) Figure 9A and Figure 9B In contrast, when the acoustic waveguide is in an upright position, such as Figure 8C As shown, with Figure 8B Compared to the illustrated embodiment, the SPL gain is slightly less than 3 dB. A considerable improvement in phase difference is also observed at the crossover frequency of approximately 1 kHz. The phase difference almost completely disappears.
[0059] Based on the foregoing description, those skilled in the art will recognize that the present invention can be implemented in different ways and based on different principles. The present invention is not limited to the embodiments described above. The foregoing embodiments and drawings are purely illustrative and are only used to enhance the understanding of the present invention. Therefore, the present invention is not limited to the embodiments described herein, but is defined in the claims.
Claims
1. A line-source loudspeaker device (100) capable of being positioned in a first position and a second position, wherein, The first position is orthogonal to the second position, and the line-source loudspeaker device (100) includes: A housing (110) is provided with a first speaker (200) and one or more second speakers (300), wherein the one or more second speakers are arranged on each side of the first speaker, wherein the first speaker is configured to emit high frequencies, and the one or more second speakers are configured to emit low frequencies; wherein the first speaker (200) and the one or more second speakers (300) each include a driver and a corresponding speaker output terminal, wherein each driver emits a spherical sound wave and is connected to the corresponding speaker output terminal, wherein the speaker output terminals together form the combined speaker output terminal of the line source speaker device. An acoustic waveguide (400) is disposed between the combined loudspeaker output terminal of the line source loudspeaker device and the first loudspeaker (200), wherein the acoustic waveguide (400) is configured to guide the sound waves emitted by the first loudspeaker on a constant wave path defined by the acoustic waveguide, such that an initial spherical sound wave can be converted into a rectangular equiphase sound wave that constructively interferes with the sound waves of the one or more second loudspeakers, thereby forming a cylindrical sound wave together; characterized in that, The acoustic waveguide (400) is rotatable about an axis coaxial with the driver of the first loudspeaker, such that the cylindrical acoustic wave propagates only in the horizontal direction at the first and second positions of the line source loudspeaker device (100).
2. The line-source loudspeaker device (100) according to claim 1, wherein, The acoustic waveguide (400) includes an internal reflector (440) and an acoustic waveguide housing (410), the acoustic waveguide housing (410) surrounding the internal reflector at a certain distance, thereby forming a channel (k) between the acoustic waveguide housing (410) and the internal reflector (440), the channel (k) extending from the acoustic wave inlet (450) to the acoustic wave outlet (420), wherein the internal reflector and the acoustic waveguide housing are formed such that the propagation time of the acoustic wave through the acoustic waveguide is constant.
3. The line-source loudspeaker device according to claim 2, wherein, The acoustic waveguide housing (410) includes an outer wall (460) configured to achieve the same reflection of acoustic waves from at least one second loudspeaker in each of the first and second positions.
4. The line-source loudspeaker device according to claim 3, wherein, The outer wall includes at least a first reflective surface and a second reflective surface, the first reflective surface and the second reflective surface being configured to be at the same distance from the at least one second speaker in the first position and the second position, respectively.
5. The line-source loudspeaker device (100) according to claim 1 or 2, wherein, The output of the combined loudspeaker includes an opening at least at the location of the acoustic waveguide.
6. The line-source loudspeaker device (100) according to claim 1 or 2, wherein, The first speaker is configured to emit sound waves at frequencies of 500 Hz and higher.
7. The line-source loudspeaker device (100) according to claim 6, wherein, The one or more second speakers are configured to emit sound waves at frequencies of 500 Hz and lower.
8. The line source loudspeaker device (100) according to claim 1 or 2 further includes a first mounting system (510, 520, 530, 540) configured to mount the line source loudspeaker device at the first position and a second mounting system (550) configured to mount the line source loudspeaker device at the second position.
9. The line-source loudspeaker device (100) according to claim 8, wherein, The first mounting system (510, 520, 530, 540) is configured to be coupled to the corresponding mounting system of an adjacent line source speaker device.
10. The line-source loudspeaker device (100) according to claim 8 further includes a handle (600) disposed on the opposite side of the housing (110), wherein, The second mounting system (550) is integrally formed with one of the handles (600).
11. The line-source loudspeaker device (100) according to claim 1 or 2, wherein, The driver of the first loudspeaker is arranged parallel to the outlet side of the housing, wherein the acoustic waveguide extends from the output end of the first loudspeaker to the outlet side.
12. The line-source loudspeaker device (100) according to claim 1 or 2, wherein, The driver of at least one of the plurality of second speakers is arranged at an angle relative to the first speaker.
13. The line-source loudspeaker device (100) according to claim 12, wherein, The angle is at least 15°.
14. The line-source loudspeaker device (100) according to claim 1 or 2, wherein, The one or more second loudspeakers are arranged symmetrically in the housing with respect to the propagation plane of the emitted sound waves.
15. The line-source loudspeaker device (100) according to claim 14, wherein, The propagation plane is aligned with the central axis of the first loudspeaker.
16. The line-source loudspeaker device (100) according to claim 1 or 2, wherein, In the first position, the line source speaker device can be used for a line array, and in the second position, the line source speaker device can be used as a column speaker.
17. A line array comprising a line source speaker device according to any one of claims 1-16.
18. A column loudspeaker comprising a line-source loudspeaker device according to any one of claims 1-16.
19. A system comprising: One or more line-source loudspeaker devices according to any one of claims 1-16, A control unit configured to control each of the one or more line source speaker devices, wherein the control unit includes a wireless transmitter and each of the one or more line source speaker devices includes a wireless receiver, such that each of the one or more line source speaker devices can be wirelessly controlled by the control unit.
20. The system according to claim 19, wherein, The control includes at least one or a combination of the following: controlling the sound level of each line source loudspeaker device, controlling sound quality, monitoring data, and predicting sound quality at a location in the area surrounding the one or more line source loudspeaker devices; The control unit further includes a computer-readable storage medium storing instructions configured to cause the control unit to perform one or more of the following steps: controlling the sound level of each line source speaker device, controlling sound quality, monitoring data, and predicting sound quality at locations in the area surrounding the one or more line source speaker devices.