Loudspeaker device and system for improving low-frequency output

Abstract

The present application discloses a speaker device capable of improving low-frequency output, which includes a first speaker unit as a main speaker and a second speaker unit as an auxiliary speaker, the main speaker is used to output a full-frequency signal or a low-frequency signal, and the auxiliary speaker is used to expand the back cavity space. In this embodiment, the back of the first speaker unit and the back of the second speaker unit share a back cavity, and the front of the second speaker unit is sealed by the front cavity to prevent the sound from radiating outward. According to the relative positional relationship between the first speaker unit, the second speaker unit, the back cavity and the front cavity, the input signals of the first speaker unit and the second speaker unit can be made the same or opposite, thereby improving the low-frequency output of the entire speaker device. The present application also relates to a speaker system for improving low-frequency output.

Description

Technical Field

[0001] The present invention relates to the field of acoustic technology, and in particular to a speaker device and a speaker system for improving low-frequency output. Background Art

[0002] At present, it is common to use multiple speaker units in the same sound box. This is mainly used when the physical size cannot accommodate larger-caliber speakers. By increasing the number of speaker units, the output of the speaker system can be improved. In this case, when the output of two or more speakers is in phase, the sound pressure outside the box will be superimposed. If the phases are opposite, the external sound pressure will cancel each other out.

[0003] However, in the application scenario of embedded audio, not only the size of the speaker is limited, but also the overall volume. By increasing the number of speakers and the total input power through the common box design, the mid-high frequency output can be improved, but the low frequency output is limited due to the limitation of the box volume. Even when the box volume is small to a certain extent, no matter how much the number and power of the speakers are increased, the low frequency cannot be improved.

[0004] The push-pull speaker design is to install a speaker with the sound outlet facing the inside of the box, and to input signals to the two speakers in opposite phases. This design can offset most of the even-order harmonic distortion, but because the two speakers compress the air in the box synchronously, there is also the problem that the low frequency cannot be improved when the volume is limited.

[0005] Passive radiator speaker design adds a diaphragm with a counterweight and corresponding compliant suspension edge to the box body. Driven by the main speaker, it increases the output of a certain low-frequency band. The output of frequencies below this band drops sharply. At the same time, passive radiators cannot increase the output of mid- and high-frequency frequencies. The design of a speaker with a passive radiator also requires sufficient volume, otherwise it is difficult to achieve the design purpose.

[0006] Therefore, the art still needs to develop a speaker device and system that can improve low-frequency output when the space volume is greatly limited. Summary of the invention

[0007] The purpose of the present application is to provide a speaker device that can improve the low-frequency output when the spatial volume is limited, thereby solving the technical problems in the above-mentioned prior art. Specifically, the speaker device described herein may include a first speaker unit as a main speaker and a second speaker unit as an auxiliary speaker, the main speaker is used to output a full-frequency signal or a low-frequency signal, and the auxiliary speaker is used to expand the back cavity space. In this embodiment, the back of the first speaker unit and the back of the second speaker unit share a back cavity, and the front of the second speaker unit is sealed by the front cavity to prevent the sound from radiating outward. According to the relative positional relationship between the first speaker unit, the second speaker unit, the back cavity and the front cavity, the input signals of the first speaker unit and the second speaker unit can be made the same or opposite, thereby improving the low-frequency output of the entire speaker device.

[0008] The present application also aims to provide a speaker system.

[0009] To achieve the above objectives, this application provides the following technical solutions.

[0010] In a first aspect, the present application provides a speaker device, characterized in that it includes a first speaker unit and a second speaker unit, the first speaker unit includes a first speaker unit front side including a diaphragm and a first speaker unit back side that is disposed away from the first speaker unit front side and includes a magnet, the second speaker unit includes a second speaker unit front side including a diaphragm and a second speaker unit back side that is disposed away from the second speaker unit front side and includes a magnet;

[0011] The back of the first speaker unit and the back of the second speaker unit share a same closed back cavity, the back cavity has a first volume, and the back cavity includes a back cavity inner surface and a back cavity outer surface;

[0012] The front of the second speaker unit is sealed by a front cavity for preventing the sound of the second speaker unit from radiating outwards, the front cavity has a second volume, and the front cavity includes an inner surface of the front cavity and an outer surface of the front cavity;

[0013] The first speaker unit is a main speaker for outputting a full-frequency signal or a low-frequency signal, and the second speaker unit is an auxiliary speaker for expanding the space of the back cavity.

[0014] In one embodiment of the first aspect, the back cavity inner surface includes a first back cavity inner surface and a second back cavity inner surface arranged opposite to each other, the first speaker unit and the first speaker unit are simultaneously arranged on the first back cavity inner surface or the second back cavity inner surface, and the first speaker unit and the second speaker unit are connected in anti-phase.

[0015] In one embodiment of the first aspect, the inner surface of the back cavity includes a first inner surface of the back cavity and a second inner surface of the back cavity arranged opposite to each other, the first speaker unit is arranged on the first inner surface of the back cavity, the second speaker unit is arranged on the second inner surface of the back cavity, and the first speaker unit and the second speaker unit are connected in anti-phase.

[0016] In one embodiment of the first aspect, the inner surface of the back cavity includes a fourth inner surface of the back cavity and a second inner surface of the back cavity arranged at an angle to each other, the first speaker unit is arranged on the inner surface of the fourth back cavity, and the front of the first speaker unit faces the external space, and the second speaker unit is arranged on the inner surface of the second back cavity, and the front of the second speaker unit faces the inner space of the front cavity.

[0017] In an embodiment of the first aspect, the back cavity inner surface includes a first back cavity inner surface and a second back cavity inner surface disposed opposite to each other, and the back cavity outer surface includes a first back cavity outer surface and a second back cavity outer surface disposed away from each other, the first back cavity inner surface corresponds to the first back cavity outer surface, and the second back cavity inner surface corresponds to the second back cavity outer surface;

[0018] The front cavity inner surface comprises a first front cavity inner surface and a second front cavity inner surface which are arranged opposite to each other, and the front cavity outer surface comprises a first front cavity outer surface and a second front cavity outer surface which are arranged away from each other, the first front cavity inner surface corresponds to the first front cavity outer surface, and the second front cavity inner surface corresponds to the second front cavity outer surface;

[0019] The second back cavity outer surface overlaps at least a portion of the first front cavity inner surface;

[0020] The first speaker unit is arranged on the outer surface of the first back cavity, and the front of the first speaker unit faces the inner space of the back cavity, and the second speaker unit is arranged on the inner surface of the first front cavity, and the front of the second speaker unit faces the inner space of the back cavity;

[0021] The first speaker unit and the second speaker unit are connected in reverse phase.

[0022] In an embodiment of the first aspect, the back cavity inner surface includes a first back cavity inner surface and a second back cavity inner surface disposed opposite to each other, and the back cavity outer surface includes a first back cavity outer surface and a second back cavity outer surface disposed away from each other, the first back cavity inner surface corresponds to the first back cavity outer surface, and the second back cavity inner surface corresponds to the second back cavity outer surface;

[0023] The front cavity inner surface comprises a first front cavity inner surface and a second front cavity inner surface which are arranged opposite to each other, and the front cavity outer surface comprises a first front cavity outer surface and a second front cavity outer surface which are arranged away from each other, the first front cavity inner surface corresponds to the first front cavity outer surface, and the second front cavity inner surface corresponds to the second front cavity outer surface;

[0024] The second back cavity outer surface overlaps at least a portion of the first front cavity inner surface;

[0025] The first speaker unit is arranged on the outer surface of the first back cavity, and the front of the first speaker unit faces the inner space of the back cavity, and the second speaker unit is arranged on the inner surface of the second back cavity, and the front of the second speaker unit faces the inner space of the front cavity;

[0026] The first speaker unit and the second speaker unit are connected in phase.

[0027] In an embodiment of the first aspect, the back cavity inner surface includes a first back cavity inner surface and a second back cavity inner surface disposed opposite to each other, and the back cavity outer surface includes a first back cavity outer surface and a second back cavity outer surface disposed away from each other, the first back cavity inner surface corresponds to the first back cavity outer surface, and the second back cavity inner surface corresponds to the second back cavity outer surface;

[0028] The front cavity inner surface comprises a first front cavity inner surface and a second front cavity inner surface which are arranged opposite to each other, and the front cavity outer surface comprises a first front cavity outer surface and a second front cavity outer surface which are arranged away from each other, the first front cavity inner surface corresponds to the first front cavity outer surface, and the second front cavity inner surface corresponds to the second front cavity outer surface;

[0029] The second back cavity outer surface overlaps at least a portion of the first front cavity inner surface;

[0030] The first speaker unit is arranged on the inner surface of the first back cavity, and the front of the first speaker unit faces the external space, and the second speaker unit is arranged on the inner surface of the first front cavity, and the front of the second speaker unit faces the inner space of the back cavity;

[0031] The first speaker unit and the second speaker unit are connected in phase.

[0032] In an embodiment of the first aspect, the back cavity inner surface includes a first back cavity inner surface and a second back cavity inner surface disposed opposite to each other, and the back cavity outer surface includes a first back cavity outer surface and a second back cavity outer surface disposed away from each other, the first back cavity inner surface corresponds to the first back cavity outer surface, and the second back cavity inner surface corresponds to the second back cavity outer surface;

[0033] The front cavity inner surface comprises a first front cavity inner surface and a second front cavity inner surface which are arranged opposite to each other, and the front cavity outer surface comprises a first front cavity outer surface and a second front cavity outer surface which are arranged away from each other, the first front cavity inner surface corresponds to the first front cavity outer surface, and the second front cavity inner surface corresponds to the second front cavity outer surface;

[0034] The second back cavity outer surface overlaps at least a portion of the first front cavity inner surface;

[0035] The first speaker unit is arranged on the inner surface of the first back cavity, and the front of the first speaker unit faces the external space, and the second speaker unit is arranged on the inner surface of the second back cavity, and the front of the second speaker unit faces the inner space of the front cavity;

[0036] The first speaker unit and the second speaker unit are connected in reverse phase.

[0037] In an implementation of the first aspect, an air pressure balance channel connected to the outside is provided in the front cavity and the back cavity space away from the first speaker unit and the second speaker unit, and the acoustic resistance of the air pressure balance channel does not affect the sound output of the speaker device.

[0038] In an implementation manner of the first aspect, installation heights of the first speaker unit and the second speaker unit are the same or different.

[0039] In a second aspect, the present application provides a speaker system, comprising a sound source, a post-processor, a first amplifier, a low-pass filter, a second amplifier, a first speaker unit, and a second speaker unit, wherein the sound source, the post-processor, the first amplifier, and the first speaker unit are electrically connected to output a full-range signal;

[0040] wherein the sound source, the post-processor, the low-pass filter, the second amplifier and the second speaker unit are electrically connected to output a low-frequency signal;

[0041] The first speaker unit is the first speaker unit as described above, and the second speaker unit is the second speaker unit as described above.

[0042] Compared with the prior art, the beneficial effects of the present application are as follows: In the present application, the back of the first speaker unit and the back of the second speaker unit share a back cavity, and the front of the second speaker unit is sealed by the front cavity to prevent the sound from radiating outward. According to the relative position relationship between the first speaker unit, the second speaker unit, the back cavity and the front cavity, the input signals of the first speaker unit and the second speaker unit can be made the same or opposite, thereby improving the low-frequency output of the entire speaker device. The second speaker unit can increase the size of the shared back cavity by synchronously compressing the air in the sealed front cavity, so that the equivalent back cavity volume is greater than the sum of the volumes of the shared front cavity and the sealed front cavity, while improving the nonlinearity of the compliance of the closed back cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A schematic diagram showing a speaker device according to an embodiment of the present application.

[0044] Figure 2 A schematic diagram showing a speaker device according to another embodiment of the present application.

[0045] Figure 3 A schematic diagram showing a speaker device according to another embodiment of the present application.

[0046] Figure 4 A schematic diagram showing a speaker device according to another embodiment of the present application.

[0047] Figure 5 A schematic diagram showing a speaker device according to another embodiment of the present application.

[0048] Figure 6 A schematic diagram showing a speaker device according to another embodiment of the present application.

[0049] Figure 7 A schematic diagram showing a speaker device according to another embodiment of the present application.

[0050] Figure 8 The simulation results of different front cavity and back cavity size combinations when the total volume is fixed according to Example 3 are shown.

[0051] Fig. 9 A schematic diagram showing a speaker system link.

[0052] The reference numerals and names in the figures are as follows:

[0053] 10. First speaker unit; 101. Front of first speaker unit; 102. Back of first speaker unit; 20. Second speaker unit; 201. Front of second speaker unit; 202. Back of second speaker unit; 30. Front cavity; 301. External surface of first front cavity; 302. External surface of second front cavity; 303. External surface of third front cavity; 304. External surface of fourth front cavity; 305. Internal surface of first front cavity; 306. Internal surface of second front cavity; 307. 3. The inner surface of the front cavity; 308. The inner surface of the fourth front cavity; 40. The back cavity; 401. The outer surface of the first back cavity; 402. The outer surface of the second back cavity; 403. The outer surface of the third back cavity; 404. The outer surface of the fourth back cavity; 405. The inner surface of the first back cavity; 406. The inner surface of the second back cavity; 407. The inner surface of the third back cavity; 408. The inner surface of the fourth back cavity; 1. The sound source; 2. The post-processor; 3. The low-pass filter; 4. The first amplifier; and 5. The second amplifier. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0055] Definition of terms

[0056] As used herein, the term "speaker unit front" refers to the side of the speaker including the diaphragm. The term "speaker unit back" refers to the side of the speaker including the magnet.

[0057] As mentioned above, in embedded audio application scenarios such as mobile phones, the design space of the speaker is limited, resulting in poor low-frequency output. Therefore, there is a need in the art to develop a speaker device and a speaker system that can improve low-frequency output.

[0058] In one embodiment, the present application provides a speaker device, which may include a first speaker unit for outputting a full-frequency signal or a low-frequency signal and a second speaker unit for outputting a low-frequency signal, the back of the first speaker unit and the back of the second speaker unit share the same closed back cavity, and the front of the second speaker unit is sealed by a front cavity, which is used to prevent the sound of the second speaker unit from radiating outward. According to the relative position relationship between the first speaker unit, the second speaker unit, the back cavity and the front cavity, the input signals of the first speaker unit and the second speaker unit can be made the same or opposite, thereby improving the low-frequency output of the entire speaker device. The second speaker unit can increase the size of the shared back cavity by synchronously compressing the air in the sealed front cavity, so that the equivalent back cavity volume is greater than the sum of the volumes of the shared front cavity and the sealed front cavity, while improving the nonlinearity of the compliance of the closed back cavity.

[0059] It should be pointed out that although the front cavity and the back cavity are described as sealed, in order to avoid the internal and external pressure difference caused by changes in the external atmospheric pressure and affect the initial equilibrium position of the speaker unit suspension system, it is possible to choose to make an air pressure balance channel with a large acoustic resistance away from the speaker unit position in their respective spaces and connect it to the outside world. The acoustic resistance of the air pressure balance channel does not affect the sound output of the speaker device.

[0060] refer to Figure 1 According to Embodiment 1, the speaker device may include a first speaker unit 10 and a second speaker unit 20. The first speaker unit 10 includes a first speaker unit front 101 for radiating sound and a first speaker unit back 102 disposed opposite to the first speaker unit front 101 and including a magnet. The second speaker unit 20 includes a second speaker unit front 201 for compressing space and a second speaker unit back 202 disposed opposite to the second speaker unit front 201 and including a magnet. Figure 1 In the illustrated embodiment, the back surface 102 of the first speaker unit and the back surface 202 of the second speaker unit share the same closed back cavity 40. The back cavity 40 has a first volume, and the back cavity 40 includes a back cavity internal surface and a back cavity external surface. Specifically, the back cavity 40 may include a first back cavity external surface 401, a second back cavity external surface 402, a third back cavity external surface 403, a fourth back cavity external surface 404, a first back cavity internal surface 405, a second back cavity internal surface 406, a third back cavity internal surface 407, and a third back cavity internal surface 408.

[0061] The front face 201 of the second speaker unit is sealed by a front cavity 30 to prevent the sound of the second speaker unit from radiating outward. The front cavity 30 has a second volume, and the front cavity 30 includes a front cavity inner surface and a front cavity outer surface. Similarly, the front cavity 30 may include a first front cavity outer surface 301, a second front cavity outer surface 302, a third front cavity outer surface 303, a fourth front cavity outer surface 304, a first front cavity inner surface 305, a second front cavity inner surface 306, a third front cavity inner surface 307, and a third front cavity inner surface 308. Those skilled in the art will appreciate that Figure 1 Shown is a cross-sectional view, and both the front cavity 30 and the back cavity 40 are sealed. In addition, the front cavity 30 and the back cavity 40 are not directly connected to each other.

[0062] exist Figure 1 In the illustrated embodiment, the first speaker unit 10 is a main speaker for outputting full-frequency signals or low-frequency signals, and the second speaker unit 20 is an auxiliary speaker for expanding the back cavity space.

[0063] exist Figure 1 In the illustrated embodiment, the first back cavity inner surface 401 and the second back cavity inner surface 402 may be arranged opposite to each other, preferably arranged parallel to each other. The first speaker unit 10 may be arranged on the first back cavity inner surface 401, and the first speaker unit front 101 may face the external space. Specifically, the first speaker unit front 101 may face the first back cavity external surface 401. The second speaker unit 20 may be arranged on the second back cavity inner surface 402, and the second speaker unit front 201 may face the internal space of the front cavity 30. The installation heights of the first speaker unit 10 and the second speaker unit 20 may be the same or different.

[0064] The front face 201 of the second speaker unit is sealed by the front cavity 30. Specifically, the front face 201 of the second speaker unit faces the first front cavity inner surface 305, and the first front cavity inner surface 305 overlaps a portion of the second back cavity outer surface 402. In other words, the front cavity 30 and the back cavity 40 share a portion of the side wall. The third front cavity inner surface 307 and the fourth front cavity inner surface 308 may intersect with the second back cavity outer surface 402.

[0065] As an alternative implementation, refer to Figure 2 The difference between this embodiment and embodiment 2 is that the first speaker unit 10 and the second speaker unit 20 are both arranged on the first back cavity inner surface 405. The front face 101 of the first speaker unit faces the external space, while the front face 201 of the second speaker unit faces the inner space of the front cavity.

[0066] In the speaker device disclosed in this embodiment, the first speaker unit 10 and the second speaker unit 20 can be connected in reverse phase. The first speaker unit 10 is used as a main speaker to input a full-frequency signal after post-processing. The second speaker unit 20 is used as an auxiliary speaker to input a low-frequency signal after post-processing by adding a low-pass filter (the frequency and order are determined by the speaker parameters, performance, box shape and volume). The phase of the power amplifier output signal to the speaker is opposite to that of the main speaker. The front of the speaker is sealed by a front cavity to prevent the sound from radiating outward.

[0067] Since the second speaker unit only inputs low-frequency signals and its phase is opposite to that of the first speaker unit, the low-frequency sound waves will be superimposed and offset outside the box, so a front cavity is sealed on the front of the second speaker unit to prevent the sound from radiating outward. Since the phase is opposite to that of the first speaker unit, the second speaker unit can increase the size of the shared back cavity by compressing the air in the sealed front cavity, while improving the nonlinearity of the closed back cavity compliance.

[0068] refer to Figure 3 , this embodiment is an alternative implementation of embodiment 1. The difference between this embodiment and embodiment 1 is that the first speaker unit 10 is arranged on the fourth back cavity internal surface 408, and the front face 101 of the first speaker unit faces the external space, for example, toward the fourth back cavity external surface 404. The second speaker unit 20 is arranged on the second back cavity internal surface 407, and the front face 201 of the second speaker unit faces the internal space of the front cavity, for example, toward the first front cavity internal surface 305. The fourth back cavity internal surface 408 and the second back cavity internal surface 407 can be arranged at an angle.

[0069] exist Figure 3 In the illustrated embodiment, the first speaker unit front face 101 faces the fourth back cavity outer surface 404, and the second speaker unit front face 201 faces the second back cavity outer surface 402. In addition, the fourth front cavity outer surface 304 of the front cavity 30 may protrude outward.

[0070] In this embodiment, the volume of the front cavity 30 may be greater than the volume of the back cavity 40. In this embodiment, the auxiliary speaker faces the sealed front cavity, the main speaker faces the external space, and the dual speakers are connected in reverse phase. In this embodiment, the larger the volume of the sealed front cavity, the smaller the shared back cavity volume, the larger the equivalent back cavity volume, and the better the low-frequency effect.

[0071] refer to Figure 4 Embodiment 3 is an alternative implementation of Embodiment 1. The difference between this implementation and Embodiment 1 is that the front face 101 of the first speaker unit faces the inner space of the back cavity, for example, it can face the inner surface 405 of the first back cavity, and the front face 201 of the second speaker unit also faces the inner space of the back cavity, for example, it can face the inner surface 406 of the second back cavity.

[0072] In this embodiment, the second back cavity outer surface 402 overlaps at least a portion of the first front cavity inner surface 305. Figure 4 In the embodiment shown, the contour of the first front cavity inner surface 305 is a "concave" shape that is concave toward the second front cavity outer surface 302. The first speaker unit is disposed on the first back cavity outer surface, and the first speaker unit faces the first back cavity inner surface, and the second speaker unit faces the second back cavity inner surface 406.

[0073] In this embodiment, the auxiliary speaker is located in a closed front cavity with its front facing the common back cavity, the main speaker is located in an external space with its front facing the common back cavity, and the dual speakers are connected in reverse phase.

[0074] refer to Figure 5 Embodiment 4 is an alternative implementation of Embodiment 3. The difference between this embodiment and Embodiment 3 is that the front of the second speaker unit faces the inner space of the front cavity, for example, it can face the inner surface 305 of the first front cavity.

[0075] In this embodiment, the auxiliary speaker is located in the common back cavity with its front facing the closed front cavity, the main speaker is located in the external space with its front facing the common back cavity, and the dual speakers are connected in phase.

[0076] refer to Figure 6 Embodiment 5 is an alternative implementation of Embodiment 3. The difference between this embodiment and Embodiment 3 is that the front of the first speaker unit faces the external space, for example, can face the external surface 401 of the first back cavity.

[0077] In this embodiment, the auxiliary speaker is located in a closed front cavity with its front facing the common back cavity, the main speaker is located in the common back cavity with its front facing the external space, and the dual speakers are connected in phase.

[0078] refer to Figure 7 Embodiment 6 is an alternative implementation of Embodiment 5. The difference between this embodiment and Embodiment 5 is that the front face 201 of the second speaker unit faces the inner space of the front cavity, for example, can face the inner surface 305 of the first front cavity.

[0079] In this embodiment, the auxiliary speaker is located in the common back cavity with its front facing the common back cavity, the main speaker is located in the common back cavity with its front facing the external space, and the dual speakers are connected in reverse phase.

[0080] Specifically, the speaker device described in this article can also adopt a back-to-back dual speaker unit design, or a symmetrical or asymmetrical (including asymmetric diaphragm / voice coil size and position) double-sided speaker unit design with a shared magnetic circuit. When assembled, the back of the dual speakers forms a self-sealed back cavity, the auxiliary speaker faces the sealed front cavity, and the main speaker faces the external space.

[0081] This embodiment relates to performance simulation results.

[0082] The speaker device has the design described in Example 1. And the parameters of the first speaker unit and the second speaker unit are as follows:

[0083] .

[0084] Using the common box inverted design, each speaker unit has 1W input and the test distance is 1m. The test results are as follows Figure 8 As shown. In a fixed total volume of 100cc, the five curves correspond to the sealed front cavity volumes of 10cc, 30cc, 50cc, 70cc and 90cc, respectively. Curve a represents a front cavity volume of 90cc, curve b represents a front cavity volume of 70cc, curve c represents a front cavity volume of 50cc, curve d represents a front cavity volume of 30cc, and curve e represents a front cavity volume of 10cc. The results show that the larger the sealed front cavity, the smaller the shared back cavity, the larger the equivalent back cavity volume, and the better the low-frequency effect.

[0085] refer to Fig. 9 , this embodiment provides a speaker system.

[0086] The speaker system of this embodiment may include a sound source 1, a post-processor 2, a first amplifier 4, a low-pass filter 3, a second amplifier 5, a first speaker unit 10, and a second speaker unit 20. The sound source 1, the post-processor 2, the first amplifier 4, and the first speaker unit 10 are electrically connected to output full-frequency signals. The sound source 1, the post-processor 2, the low-pass filter 3, the second amplifier 5, and the second speaker unit 20 are electrically connected to output low-frequency signals.

[0087] The features and installation methods of the first speaker unit 10 and the second speaker unit 20 may be as described above.

[0088] In addition, in the above-mentioned implementation mode of adopting the inverting connection method, the inverting connection method can be realized by an inverter or a wiring structure. The inverter can be integrated in the post-processor.

[0089] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present application. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A speaker device, characterized in that: The first speaker unit comprises a first speaker unit front surface including a diaphragm and a first speaker unit back surface disposed away from the first speaker unit front surface and comprising a magnet, and the second speaker unit comprises a second speaker unit front surface including a diaphragm and a second speaker unit back surface disposed away from the second speaker unit front surface and comprising a magnet; The back of the first speaker unit and the back of the second speaker unit share a same closed back cavity, the back cavity has a first volume, and the back cavity includes a back cavity inner surface and a back cavity outer surface; The front of the second speaker unit is sealed by a front cavity for preventing the sound of the second speaker unit from radiating outwards, the front cavity has a second volume, and the front cavity includes an inner surface of the front cavity and an outer surface of the front cavity; The first speaker unit is a main speaker for outputting a full-frequency signal or a low-frequency signal, and the second speaker unit is an auxiliary speaker. By adding a low-pass filter and inputting a post-processed low-frequency signal, the second speaker unit can be used to expand the space of the back cavity by synchronously compressing the air in the sealed front cavity.

2. The speaker device according to claim 1, characterized in that The inner surface of the back cavity comprises a first inner surface of the back cavity and a second inner surface of the back cavity which are arranged opposite to each other, the first speaker unit and the second speaker unit are arranged on the first inner surface of the back cavity or the second inner surface of the back cavity at the same time, and the front of the first speaker unit faces the external space, and the front of the second speaker unit faces the inner space of the front cavity; Alternatively, the first speaker unit is arranged on the inner surface of the first back cavity, and the front of the first speaker unit faces the external space, and the second speaker unit is arranged on the inner surface of the second back cavity, and the front of the second speaker unit faces the inner space of the front cavity; The first speaker unit and the second speaker unit are connected in reverse phase.

3. The speaker device according to claim 1, wherein The inner surface of the back cavity comprises a fourth inner surface of the back cavity and a second inner surface of the back cavity which are arranged at an angle to each other, the first speaker unit is arranged on the inner surface of the fourth back cavity, and the front of the first speaker unit faces the external space, and the second speaker unit is arranged on the inner surface of the second back cavity, and the front of the second speaker unit faces the inner space of the front cavity; The first speaker unit and the second speaker unit are connected in reverse phase.

4. The speaker device according to claim 1, wherein The back cavity inner surface comprises a first back cavity inner surface and a second back cavity inner surface which are arranged opposite to each other, and the back cavity outer surface comprises a first back cavity outer surface and a second back cavity outer surface which are arranged away from each other, the first back cavity inner surface corresponds to the first back cavity outer surface, and the second back cavity inner surface corresponds to the second back cavity outer surface; The front cavity inner surface comprises a first front cavity inner surface and a second front cavity inner surface which are arranged opposite to each other, and the front cavity outer surface comprises a first front cavity outer surface and a second front cavity outer surface which are arranged away from each other, the first front cavity inner surface corresponds to the first front cavity outer surface, and the second front cavity inner surface corresponds to the second front cavity outer surface; The second back cavity outer surface overlaps at least a portion of the first front cavity inner surface; The first speaker unit is arranged on the inner surface of the first back cavity, and the front of the first speaker unit faces the external space, and the second speaker unit is arranged on the inner surface of the second back cavity, and the front of the second speaker unit faces the inner space of the front cavity; The first speaker unit and the second speaker unit are connected in reverse phase.

5. The loudspeaker device according to any one of claims 1 to 4, characterized in that: An air pressure balance channel connected to the outside is arranged in the front cavity and the back cavity space away from the first speaker unit and the second speaker unit, and the setting of the acoustic resistance of the air pressure balance channel does not affect the sound output of the speaker device.

6. The loudspeaker device according to any one of claims 1 to 4, characterized in that: The installation heights of the first speaker unit and the second speaker unit are the same or different.

7. A speaker system, characterized in that: It includes a sound source, a post-processor, a first amplifier, a low-pass filter, a second amplifier, a first speaker unit and a second speaker unit, wherein the sound source, the post-processor, the first amplifier and the first speaker unit are electrically connected to output a full-frequency signal or a low-frequency signal; wherein the sound source, the post-processor, the low-pass filter, the second amplifier and the second speaker unit are electrically connected to output a low-frequency signal; The first speaker unit is the first speaker unit according to any one of claims 1 to 4, and the second speaker unit is the second speaker unit according to any one of claims 1 to 4.

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