Acoustic cavity design for loudspeaker enclosure

Abstract

Various embodiments disclose a housing for a speaker, comprising: a front end configured to mount a speaker cone included in a speaker driver, one or more sidewalls, where the one or more sidewalls define a cavity surrounding the speaker driver; and a rear end, where: one or more resonators are attached to the rear end or a portion of the one or more sidewalls, and the one or more resonators and the cavity in combination form an acoustic cavity enclosing a volume of air.

Description

Technical Field

[0001] Embodiments of the present disclosure relate generally to audio reproduction devices and, more particularly, to acoustic cavity designs for speaker enclosures. Background Art

[0002] Loudspeakers convert electrical energy (such as an electrical audio signal) into mechanical energy in the form of sound waves. Loudspeakers are designed to accurately reproduce a wide range of audio content, and their ability to provide this accuracy is tested by measuring the sound pressure level (SPL) over a range of frequencies, where the SPL indicates the amount of sound a speaker produces at a given frequency. The accuracy of a speaker's frequency response indicates how accurately the sound produced at a given frequency matches the audio signal ( For example , whether the speaker matches the pitch of the audio signal).

[0003] When designing a speaker, various characteristics of the speaker may result in distortion at certain frequencies or within a certain frequency range. For example, a speaker is designed with a speaker housing enclosing a certain volume and a speaker driver that includes a magnet system that responds to a magnetic field generated by a voice coil. In some cases, the magnet system is physically configured within the speaker housing so that portions of the magnet system and the frame of the speaker housing form an acoustic volume within the speaker. Depending on the configuration, the speaker housing contains multiple acoustic volumes that can interact to produce undesirable fluctuations in the output sound waves within a specific frequency range.

[0004] Traditional techniques for compensating for this discontinuity involve adding physical dampers to various parts of the speaker enclosure. However, these techniques require additional expensive materials to be installed manually, increasing the cost of the speaker. Furthermore, the additional physical dampers change the impedance of the speaker, resulting in energy losses when driven by a traditional amplifier and increasing the probability of speaker failure, thereby reducing the robustness of the speaker. Other techniques involve manufacturing speakers that contain smaller magnet systems. However, such devices are more expensive and produce lower sound pressure levels.

[0005] In view of the above, more efficient loudspeakers are needed to produce consistent sound pressure levels over a wider frequency range. Summary of the invention

[0006] Various embodiments disclose a housing for a speaker comprising: a front end configured to mount a speaker cone included in a speaker driver, one or more side walls, wherein the one or more side walls define a cavity surrounding the speaker driver; and a rear end, wherein: one or more resonators are attached to the rear end or a portion of the one or more side walls, and the one or more resonators and the cavity combine to form an acoustic cavity enclosing a certain volume of air.

[0007] Further embodiments provide, inter alia, a speaker system and a method for manufacturing the electronic device set forth above.

[0008] At least one technical advantage of the disclosed embodiments over the prior art is that, using the disclosed techniques, the frequency response of a speaker device has less noticeable fluctuations than a prior art speaker device that does not use the disclosed techniques. The disclosed techniques allow the speaker device to reproduce higher quality sound. Another advantage is that a speaker device using the disclosed techniques provides an improved frequency response without adding expensive damping materials that change the impedance of the speaker device and increase the cost of the speaker device. These techniques provide one or more technical advantages over the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to be able to understand the features of the various embodiments described above in detail, the inventive concept briefly outlined above may be described in more detail with reference to various embodiments, some of which are shown in the accompanying drawings. It should be noted, however, that the drawings only illustrate typical embodiments of the inventive concept and are therefore not to be construed as limiting the scope in any way, and that there are other equally effective embodiments.

[0010] Figure 1 is a diagram showing a speaker arrangement;

[0011] Figure 2 It is used for simulation Figure 1 a schematic diagram of an electronic circuit for the frequency response of a loudspeaker device;

[0012] Figure 3A According to various implementation schemes Figure 2 A graph of the impedance of an electronic circuit;

[0013] Figure 3B According to various implementation schemes Figure 1 A graph of the frequency response of a loudspeaker device;

[0014] Figure 4 is a diagram showing a speaker device including a set of additional resonators according to various embodiments;

[0015] Figure 5 is used to simulate various embodiments Figure 4 a schematic diagram of an electronic circuit of a loudspeaker device;

[0016] Fig. 6A According to various implementation schemes Figure 5 The electrical impedance of an electronic circuit relative to Figure 2 A graphical comparison of the impedance of an electronic circuit;

[0017] Figure 6BAccording to various implementation schemes Figure 4 a graph comparing measured results of an actual frequency response of a loudspeaker device with respect to a loudspeaker device without a resonator array;

[0018] Figure 7 According to various implementation schemes Figure 4 Frequency response of the model of the resonator array;

[0019] Figure 8 is a diagram showing a resonator array for a speaker device according to various embodiments;

[0020] Fig. 9 is a diagram showing another speaker device including a resonator array according to various embodiments; and

[0021] Fig.10 A flow chart showing method steps for designing and producing a speaker device including one or more resonators according to various embodiments. DETAILED DESCRIPTION

[0022] In the following description, numerous specific details are set forth to provide a more thorough understanding of various embodiments. However, it will be apparent to one skilled in the art that the inventive concept may be practiced without one or more of these specific details.

[0023] Figure 1 1 is a diagram showing a speaker device 100. As shown in the figure, the speaker device 100 includes a speaker driver 110, a frame 120, an acoustic volume 130 and an acoustic volume 140 ( For example , 140(1), 140(2)). The frame 120 includes a front end 122, a rear end 124, and one or more side walls 126. The speaker driver 110 includes a cone 102, a flexible centering support 104, a pole 106, and a magnet system 108.

[0024] The speaker device 100 is a speaker housing defined by a frame 120, which acts as a housing for other components. The frame 120 includes a speaker driver 110 connected to a front end 122 and acoustic volumes 130, 140 defined by a rear end 124, the sides of the frame 120, and portions of the speaker driver 110. The speaker device 100 is an energy converter that converts electrical energy into mechanical energy in the form of sound waves. In operation, the speaker driver 110 generates sound waves in response to an electric current. The speaker driver 110 includes a coil ("voice coil") that is wound around a pole 106 and attached to a terminal (not shown). The voice coil is suspended between the poles of a magnet included in a magnet system 108, where the magnet generates a magnetic field. Applying an electrical audio signal to the voice coil via the terminals causes the voice coil to move within the magnetic field. The cone 102 moves due to the movement of the pole 106, thereby generating air pressure waves, which are perceived by the user as sound waves.

[0025] The characteristics of the acoustic volume 130 affect the sound waves output by the speaker device 100. The size of the acoustic volume 130 affects the resonance of the speaker driver 110, with larger enclosures being closer to a free air cavity. Other characteristics affect the operation of the speaker device 100. For example, a portion of the frame 120 and the magnet system 108 form acoustic volumes 140(1), 140(2) ( For example , shown as a separate portion of the volume surrounding the magnet system 108). As will be discussed in further detail below, the addition of the acoustic volume 140 modifies the acoustic impedance of the speaker device and changes the output of the speaker device 100 over various frequency ranges.

[0026] Figure 2 It is used for simulation Figure 1 Schematic diagram of an electronic circuit 200 for measuring the frequency response of the speaker device 100. The electronic circuit 200 includes a power supply 202, a first loop 210, and a second loop 220. The first loop 210 includes a first resistor 214 and a first capacitor 216. The second loop 220 includes an inductor 222, a second resistor 224, and a second capacitor 226.

[0027] When the speaker device 100 compresses air to produce sound, the air has properties such as acoustic compliance and acoustic inertia that affect how the air moves within the acoustic volume 130. The ratio of acoustic pressure to flow is represented by acoustic impedance. Acoustic compliance, inertia, and impedance can be represented by an equivalent RLC circuit. The electronic circuit 200 provides an equivalent model of the physical interaction of acoustic properties as a combination of series and parallel electrical components. In this case, the electronic circuit 200 can be solved using loop and node analysis.

[0028] Conventional speaker design techniques typically use only the first loop 210 to represent the speaker device 100, where the acoustic volume 130 is represented as having an acoustic resistance (represented by the first resistor 214) and an acoustic capacitance (represented by the first capacitor 216). However, due to the additional acoustic volume 140 in the speaker device 100 and the acoustic mass formed by the sidewall 126 (not shown) between the magnetic system 108 and the acoustic volumes 140 and 130, the first loop 210 alone cannot accurately represent the acoustic characteristics of the speaker device 100. Instead, the electronic circuit 200 includes a second loop 220 to represent the additional acoustic volume 130 and the acoustic mass, wherein the second loop 220 includes an additional acoustic resistance (represented by the second resistor 224), an additional acoustic capacitance (represented by the second capacitor 226), and an acoustic mass (represented by the inductor 222).

[0029] The addition of the second loop 220 affects the impedance of the simulated system, which was not originally considered when designing the speaker device 100. Figure 3A and Figure 3B As further discussed in , the additional impedance in the electronic circuit 200, relative to the impedance represented by only the first loop 210, causes the speaker device 100 to have characteristics that differ from those expected when simulated based solely on the first loop 210. This difference between the expected and actual characteristics causes the speaker device 100 to generate inaccurate audio signal reproduction at certain frequencies.

[0030] Figure 3A According to various implementation schemes Figure 2 A graph 310 of a model electrical impedance of an electronic circuit. Figure 3B According to various implementation schemes Figure 1 Graph 330 shows a frequency response of a speaker device 100. Graph 310 shows a model based on an equivalent electrical impedance 312 of the electronic circuit 200 and an electrical impedance 314 of the speaker device 100. Graph 330 shows a measurement result of an actual frequency response 332 of the speaker device 100.

[0031] As discussed above, the conventional electronic equivalent circuit of the speaker device 100 includes only the first loop 210. The electrical impedance 312 of the circuit including only the first loop 210 is represented in the graph 310, where the simulated impedance is based on the values ​​of the first resistor 214 and the first capacitor 216. In contrast, the electronic circuit 200 includes an impedance based on the first loop 210 and the second loop 220. As shown in the graph 310, the electrical impedance 314 that simulates the entire electronic circuit 200 is higher than expected for at least one frequency range 302. The higher impedance at the frequency range 302 causes the speaker device 100 to produce distorted sound waves when reproducing the electrical audio signal at the frequency range 302.

[0032] Graph 330 shows the measurement results of the actual frequency response of the speaker device 100. For a speaker, the frequency response 332 is a function of the sound pressure as a function of the frequency of the reproduced sound, with higher values ​​indicating louder volume. Due to the additional impedance of the electronic circuit 200 shown in the frequency range 302, the frequency response 332 of the electronic circuit 200 also includes fluctuations. The fluctuations are temporary increases (or decreases) in the frequency response of the electronic circuit 200, followed by a separate temporary decrease (or increase) in the frequency response.

[0033] The graph 330 shows a frequency range 334 in which the speaker device 100 generates fluctuations in sound pressure. In this case, the fluctuations in the frequency response 332 cause the speaker device 100 to generate distorted sound waves when reproducing an electric audio signal within the frequency range 334.

[0034] Acoustic cavity design for loudspeaker enclosures

[0035] Figure 4 4 is a diagram illustrating a speaker device 400 including a set of additional resonators 402 according to various embodiments. As shown, but not limited to, the speaker device 400 includes a speaker driver 110, an acoustic volume 130, an acoustic volume 140, and a resonator array 410. The resonator array 410 includes an interface 408 and a set of resonators 402. Each resonator 402 includes a cavity 404 and a port 406.

[0036] The resonator array 410 includes a plurality of resonators 402 ( For example , the volume of cavity 404 of resonator 402(1) is smaller than the volume of the cavity of resonators 402(2) and 402(3), and the plurality of resonators act as resonant absorbers. In some embodiments, resonator 402 acts as an acoustic metamaterial ( For example , a sub-wavelength material with a specific acoustic inductance and capacitance), is formed of a sound absorbing material that absorbs at least a portion of the sound waves generated by the speaker driver 110. The resonator array 410 includes an interface 408 that connects the resonator array 410 to the rear end 124 of the frame 120 and the acoustic volume 130. The interface 408 includes a separate port 406 for the corresponding resonator 402. The addition of a resonator 402 in the resonator array 410 causes a change in the acoustic system within the speaker device 400. Each resonator 402 in the resonator array 410 modifies the impedance and frequency response of the speaker device 400 over a limited frequency. In various embodiments, the use of multiple resonators 402 changes the output of the speaker device 400 over a larger frequency range or multiple frequency ranges.

[0037] In various embodiments, the resonant frequency of one or more of the resonators 402 in the resonator array 410 is within a frequency range 334 where fluctuations in the frequency response 332 occur due to the acoustic volume 140. In operation, adding a given resonator 402 compensates for a frequency response 332 within a certain frequency range. Including multiple resonators 402 in the resonator array 410 provides compensation for wider frequency ranges and / or discontinuous frequency ranges. For example, the first resonator 402(1) compensates for a first frequency range ( For example , a first fluctuation in 1 kHz), and the second resonator 402 (2) and the third resonator 402 (3) compensate for the second frequency range ( For example , at around 1.4kHz).

[0038] In various embodiments, one or more resonators 402 in the resonator array 410 are Helmholtz resonators. A given Helmholtz resonator has a resonant frequency that is a function of the cavity 404 and the port 406:

[0039]

[0040] where frequency (f) is the speed of sound in the gas (C 0 ), S corresponds to the cross-sectional area of ​​port 406, L corresponds to the length of port 406, and V corresponds to the volume of cavity 404. In some embodiments, some portions of resonators 402 are identical while other portions are different so as to cause each resonator 402 to have a different resonant frequency. For example, each resonator 402(1), 402(2), 402(3) can share common dimensions of port 406 and have different volumes for the corresponding cavity 404.

[0041] Figure 5 is according to various embodiments corresponding to Figure 4 Schematic diagram of electronic circuit 500 of speaker device 400. As shown, but not limited to, electronic circuit 500 includes power supply 502, first loop 510, second loop 520 and third loop 530. First loop 510 includes first resistor 514 and first capacitor 516. Second loop 520 includes first inductor 522, second resistor 524 and second capacitor 526. Third loop 530 includes second inductor 532, third resistor 534 and third capacitor 536.

[0042] The electronic circuit 500 is similar to the electronic circuit 200. The electronic circuit 500 includes an additional third loop 530, wherein a second inductor 532, a third resistor 534, and a third capacitor 536 represent a lumped combination of the acoustic resistance, acoustic capacitance, and acoustic mass of the resonator 402 included in the resonator array 410. Figure 54. Although not shown, in various embodiments, the electronic circuit 500 can simulate the lumped acoustic impedance of additional loops corresponding to the additional resonators 402 by adding additional loops similar to the previous loops. For example, one or more additional loops for each resonator 402 can be added to the electronic circuit 500.

[0043] Fig. 6A According to various implementation schemes Figure 5 The electrical impedance of the electronic circuit 500 relative to Figure 2 Graph 610 of comparison of the electrical impedance of the electronic circuit 200 . Figure 6B According to various implementation schemes Figure 4 Graph 630 comparing the frequency response of a speaker device with resonator array 410 relative to a speaker device without resonator array 410 .

[0044] As shown, graph 610 shows equivalent electrical impedance 602 of speaker device 100 excluding resonator array 410 and electrical impedance 604 of speaker device 400 including resonator array 410. Graph 330 shows actual frequency response 642 of speaker device 100 and measurement results of frequency response 644 of speaker device 400.

[0045] As discussed above, the equivalent electronic circuit 500 of the speaker device 400 includes loops 510 to 530. Due to the inclusion of the third loop 530 that simulates the inclusion of the resonator 420, undesirable changes in the impedance of the speaker device 400 within the frequency range 606 are reduced. The inclusion of the third loop 530 in the electronic circuit 500 that simulates the speaker device 400 also indicates that the addition of the resonator 402 will also modify the frequency response of the speaker device 400. As shown in the graph 630, the speaker device 100 that does not include the resonator array 410 produces a frequency response 644 that produces fluctuations in the sound pressure level (SPL) within the frequency range 646. In contrast, the speaker device 400 that includes the resonator array 410 produces a smoother frequency response 642 within the same frequency range 646. In this case, the speaker device 400 more accurately represents the electrical audio signal than the speaker device 100.

[0046] Figure 7 According to various implementation schemes Figure 4 Graph 700 of a frequency response of a model of resonator array 410 is shown. As shown, graph 700 includes frequency responses 702 of individual resonators 402 and a composite frequency response 704.

[0047] In operation, each of the frequency responses 702(1)-702(4) are combined to produce a composite frequency response 704. In various embodiments, each resonator 402(1)-402(4) corresponding to a respective frequency response 702(1)-702(4) can be configured to have a different resonant frequency within the frequency range 710. For example, resonator 402(1) has a resonant frequency of approximately 800 Hz, while resonator 402(4) has a resonant frequency of approximately 1.4 kHz. Each of the resonators 402(1)-402(4) is configured to provide compensation for a portion of the frequency range 710 where frequency response fluctuations are detected. When all of the resonators 402(1)-402(4) are included in the speaker, the resonators 402(1)-402(4) collectively compensate for frequency response fluctuations occurring within the frequency range 710.

[0048] Figure 8 800 is a diagram illustrating a resonator array 810 for a speaker device according to various embodiments. As shown, but not limited to, the speaker device 800 includes a frame 120 and a resonator array 810. The frame 120 includes a front end 122 and a back end 124. The resonator array 810 includes resonators 802(1) to 802(9), wherein each resonator 802 has a port 806 and a cavity 804.

[0049] In various embodiments, the resonator array 810 is located below the rear end 124 of the frame 120. In this case, each port 806 is included in a common interface (not shown) connected to the rear end 124. Each resonator 802 in the resonator array 810 can have a different combination of port 806 size (represented by a transparent cylinder) and / or cavity 804 volume. For example, one or more of the cavities 804 have different volumes. Additionally or alternatively, one or more of the ports 806 can have different cross-sectional areas. In this case, each of the different resonators has a different resonant frequency and provides absorption at the resonant frequency.

[0050] Fig. 9 is a diagram illustrating another speaker device 900 including an additional resonator 902 according to various embodiments. As shown, but not limited to, the speaker device 900 includes a speaker driver 110, an acoustic volume 130, an acoustic volume 140, and a resonator 902. In various embodiments, the speaker device 900 includes the resonator 902 and / or additional resonators (not shown) around the circumference of the frame 120 of the speaker device 900, in place of or in addition to the resonator array 410.

[0051] Fig.10 A flowchart showing method steps for designing and producing a loudspeaker device including one or more resonators according to various embodiments. Figures 4 to 9 Although the method steps are described with reference to systems and embodiments, those skilled in the art will understand that any system configured to perform the method steps in any order falls within the scope of the present disclosure.

[0052] As shown, method 1000 begins at step 1002, where the frequency response of a speaker enclosure is determined. In various embodiments, the frequency response of a speaker device 100 is obtained. In some embodiments, the designer and / or design hardware tests the frequency output of a speaker device 100 having a speaker driver 110 and an acoustic volume 130. In some embodiments, the designer provides a desired range ( For example The microphone receives the sound waves generated by the speaker device 100 and records the sound pressure level of each frequency.

[0053] At step 1004, the frequency response is checked to determine whether each frequency range has been examined. For example, the frequency response can be divided into different logarithmic frequency ranges ( For example , 500 Hz-1 kHz, 1 kHz-2 kHz Hz, etc.). In this case, each frequency range may be examined to determine if there is a fluctuation in the frequency response of the speaker device 100. When at least one frequency range is to be examined, the designer and / or design hardware proceeds to step 1006; otherwise, the designer and / or design hardware proceeds to step 1012.

[0054] At step 1006, a specific frequency range within the frequency response is selected. At step 1008, the designer and / or design hardware determines whether fluctuations in the frequency response occur within the specific frequency range. In various embodiments, a given frequency range is examined to determine whether the sound pressure level of the speaker device 100 includes fluctuations when reproducing electrical audio signals with frequencies within the given range. For example, the designer can generate a model of the speaker device 100 and can examine the characteristics of the model, including the expected electrical impedance ( For example , electrical impedance 312 and / or 602) and / or expected sound pressure level response. Additionally or alternatively, the designer may generate a speaker device and measure the actual frequency response of the speaker device ( For example, frequency response 332 and / or 642). The fluctuation may include an irregular change (increase or decrease) in the sound pressure level relative to the sound pressure level output in an adjacent frequency range. In some embodiments, the measured sound pressure level may be compared to a minimum and / or maximum threshold for a particular frequency range. Additionally or alternatively, in some embodiments, the derivative of the sound pressure level for a frequency range may be compared to a derivative threshold for the frequency range. When a fluctuation is detected, the designer and / or design hardware proceeds to step 1010. Otherwise, no fluctuation is detected and the designer and / or design hardware returns to step 1004.

[0055] At step 1010, one or more resonators are selected to compensate for fluctuations in the frequency response. In various embodiments, one or more resonators 402 are selected to compensate for fluctuations occurring at a particular frequency. For example, a resonant absorber having a resonant frequency within the frequency range may be selected. In some embodiments, multiple resonators 402 may be selected to cover a wider frequency range. For example, a pair of resonators may be selected to cover a particular frequency range. Additionally or alternatively, a set of multiple resonators 402 may be selected, each having a resonant frequency within a selected frequency range. In some embodiments, the characteristics of the resonator may be changed based on the selected frequency range. For example, the dimensions of the cavity and / or port of the resonator may be changed to modify the resonant frequency so that it appears within the selected frequency range. After selecting one or more resonators for the selected frequency range, method 1000 returns to step 1004 to determine whether another frequency range needs to be reviewed. When it is determined that no other frequency range needs to be reviewed, method 1000 proceeds to step 1012. Otherwise, it is determined that at least one frequency range needs to be reviewed and method 1000 returns to step 1004.

[0056] At step 1012, one or more resonators are added to create a composite speaker enclosure. In various embodiments, a resonator array 410 including one or more resonators is added to the speaker enclosure. In some embodiments, the resonator array 410 includes an interface 408 that connects the corresponding resonator 402 to the acoustic volume 130. Additionally or alternatively, one or more resonators 902 can be added to the frame 120 of the speaker device 100 between the cone 102 and the magnet system 108. Adding the resonator array 410 and / or the resonator 902 creates a composite speaker enclosure.

[0057] At step 1014, the composite speaker enclosure is manufactured. In various embodiments, one or more manufacturing devices generate a speaker device 400 including a composite speaker enclosure. In some embodiments, the manufacturing device forms a frame 120 that includes the acoustic volume 130, the resonator array 410, and / or the top resonator 908 as part of the frame 120. Alternatively, in some embodiments, the manufacturing device forms the frame 120 and the resonator array 410 separately. In this case, the manufacturing device assembles the speaker device 400 by combining the speaker driver 110, the frame 120, and the resonator array 410.

[0058] At step 1016, the composite speaker optionally outputs sound waves based on the input electrical audio signal. In various embodiments, during manufacture, a speaker device including a resonator array receives an electrical audio signal. For example, a voice coil included in a speaker driver 110 receives the electrical audio signal via a terminal. Applying the electrical audio signal to the voice coil causes the voice coil to move within a magnetic field generated by the magnet system 108. The cone 102 is based on the voice coil, causing the air within the composite speaker housing to alternately compress and expand. The change in air pressure generates pressure waves, which a user perceives as sound waves.

[0059] In summary, embodiments of the present disclosure include a speaker housing comprising a main housing and a connected resonator array that, in combination, enclose a common volume of air. The configuration of the main housing and the speaker driver forms a separate acoustic volume. This includes an acoustic volume below the speaker driver and an additional acoustic volume between a portion of the magnet system and the sides of the housing. The resonant frequency of each resonator in the resonator array is within a frequency range where undesirable fluctuations in the sound pressure level occur. When reproducing an electrical audio signal, the composite speaker volume generates a composite frequency response in which fluctuations in the sound pressure level are attenuated by the resonators included in the resonator array.

[0060] At least one technical advantage of the disclosed embodiments over the prior art is that, using the disclosed techniques, the frequency response of a speaker device has less noticeable fluctuations than a prior art speaker device that does not use the disclosed techniques. The disclosed techniques allow the speaker device to reproduce higher quality sound. Another advantage is that a speaker device using the disclosed techniques provides an improved frequency response without adding expensive damping materials that change the impedance of the speaker device and increase the cost of the speaker device. These techniques provide one or more technical advantages over the prior art.

[0061] 1. In various embodiments, a housing for a speaker includes: a front end configured to mount a speaker cone connected to a speaker driver; one or more side walls, wherein the one or more side walls define a cavity surrounding the speaker driver; and a rear end, wherein: one or more resonators are attached to the rear end or a portion of the one or more side walls, and the one or more resonators and the cavity combine to form an acoustic cavity enclosing a certain volume of air.

[0062] 2. The housing of claim 1 , wherein a first resonator of the one or more resonators has a first resonant frequency within a first frequency range, a second resonator of the one or more resonators has a second resonant frequency within the first frequency range, and the first resonant frequency is different from the second resonant frequency.

[0063] 3. The housing of clause 1, wherein the one or more resonators reduce fluctuations in the frequency response of the speaker.

[0064] 4. A housing according to any one of clauses 1 to 3, wherein the fluctuations occur within a first frequency range, and a first resonator of the one or more resonators has a first resonant frequency within a second frequency range, and the second frequency range falls within the first frequency range.

[0065] 5. The housing according to any of clauses 1 to 4, wherein the one or more resonators comprises at least one Helmholtz resonator.

[0066] 6. A housing according to any one of clauses 1 to 5, wherein the one or more resonators include a first Helmholtz resonator, the first Helmholtz resonator including a first cavity having a first volume and a first port having a first cross-sectional area and a first length; and a second Helmholtz resonator, the second Helmholtz resonator including a second cavity having a second volume and a second port having the first cross-sectional area and the first length.

[0067] 7. A housing according to any one of clauses 1 to 6, wherein the one or more resonators include a first Helmholtz resonator, the first Helmholtz resonator including a first cavity having a first volume and a first port having a first cross-sectional area and a first length; and a second Helmholtz resonator, the second Helmholtz resonator including a second cavity having the first volume and a second port having a second cross-sectional area and a second length.

[0068] 8. A housing according to any of clauses 1 to 7, wherein the one or more resonators form an acoustic metamaterial capable of absorbing sound waves.

[0069] 9. In various embodiments, a speaker includes: a speaker driver, the speaker driver including a cone, a pole and a magnet system; a shell, wherein the speaker driver and the shell define a cavity surrounding the speaker driver; and one or more resonators, the one or more resonators being connected to a portion of the shell, wherein the one or more resonators and the cavity combine to form an acoustic cavity enclosing a certain volume of air.

[0070] 10. A loudspeaker according to clause 9, wherein a first resonator of the one or more resonators has a first resonant frequency within a first frequency range, a second resonator of the one or more resonators has a second resonant frequency within the first frequency range, and the first resonant frequency is different from the second resonant frequency.

[0071] 11. A loudspeaker according to clause 9 or 10, wherein the one or more resonators reduce fluctuations in the frequency response of the loudspeaker.

[0072] 12. A loudspeaker according to any one of clauses 9 to 11, wherein the fluctuation occurs within a first frequency range, and a first resonator of the one or more resonators has a first resonant frequency within a second frequency range, and the second frequency range falls within the first frequency range.

[0073] 13. A loudspeaker according to any one of clauses 9 to 12, wherein the one or more resonators are comprised in a separate housing, and the separate housing comprises an interface connecting the separate housing to a rear end of the housing.

[0074] 14. The loudspeaker of claim 9, wherein the magnet system and one or more side walls of the housing define an acoustic volume included in the cavity, and a first resonator of the one or more resonators is positioned on the one or more side walls along the acoustic volume.

[0075] 15. In various embodiments, a method includes: manufacturing a shell for a speaker device, the shell comprising a front end, one or more side walls, and a rear end; adding a speaker driver to the shell, wherein the speaker driver and the shell define a cavity surrounding the speaker driver; and connecting one or more resonators to the rear end or the one or more side walls of the shell, wherein the one or more resonators and the cavity combine to form a sound cavity enclosing a certain volume of air.

[0076] 16. The method of clause 15, wherein the one or more resonators are coupled to the rear end or the one or more side walls of the housing prior to manufacturing the housing.

[0077] 17. The method of clause 15 or 16, wherein the one or more resonators include a plurality of resonators, a first resonator of the plurality of resonators coupled to the rear end of the housing, and a second resonator of the plurality of resonators coupled to the one or more side walls of the housing.

[0078] 18. A method according to any of clauses 15 to 17, wherein the one or more resonators comprises at least one Helmholtz resonator.

[0079] 19. A method according to any one of clauses 15 to 18, further comprising manufacturing one or more ports along at least one wall of the shell or along the rear end of the shell when manufacturing the shell, wherein connecting the one or more resonators to the rear end of the shell or the one or more side walls includes connecting each of the one or more resonators to a corresponding one of the one or more ports.

[0080] 20. A method according to any of clauses 15 to 19, wherein an acoustic metamaterial capable of absorbing sound waves is formed by the one or more resonators.

[0081] Any and all combinations of any claim elements recited in any claim and / or any elements described in this application, in any manner, are within the contemplated scope of the invention and protection.

[0082] The description of the various embodiments has been presented for purposes of illustration, but is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

[0083] Aspects of the present embodiment may be embodied as a system, method or computer program product. Therefore, aspects of the present disclosure may take the following forms: a complete hardware implementation, a complete software implementation (including firmware, resident software, microcode, etc.) or an implementation combining software and hardware aspects, which may generally be referred to as a "module", "system" or "computer" in this article. In addition, any hardware and / or software technology, process, function, component, engine, module or system described in the present disclosure may be implemented as a circuit or a collection of circuits. In addition, aspects of the present disclosure may take the form of a computer program product embodied in one or more computer-readable media, on which a computer-readable program code is embodied.

[0084] Any combination of one or more computer-readable media may be utilized. A computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or apparatus, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) would include the following media: an electrical connection with one or more conductors, a portable computer floppy disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer-readable storage medium may be any tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or apparatus.

[0085] Aspects of the present disclosure are described with reference to the flowchart illustrations and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present disclosure. It should be understood that each frame of the flowchart illustration and / or block diagram and the combination of the frames of the flowchart illustration and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine. The instruction can realize the function / action specified in one or more frames of the flowchart and / or block diagram when executed by the processor of the computer or other programmable data processing devices. Such a processor can be (but not limited to) a general-purpose processor, a special-purpose processor, a special-purpose application processor or a field programmable gate array.

[0086] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality and operation of possible implementations of the system, method and computer program product according to various embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, section or part of a code, and the code includes one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative embodiments, the functions mentioned in the box may not appear in the order mentioned in the accompanying drawings. For example, the two boxes shown in succession can actually be executed substantially at the same time, or these boxes can sometimes be executed in reverse order, depending on the functionality involved. It should also be noted that each box illustrated in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can be implemented by a system based on special-purpose hardware or a combination of special-purpose hardware and computer instructions that performs a specified function or operation.

[0087] While the foregoing is directed to embodiments of the present disclosure, other and further embodiments of the disclosure may be devised without departing from the basic scope thereof, which is determined by the following claims.

Claims

1. A housing for a loudspeaker, comprising: a front end configured to mount a speaker cone coupled to a speaker driver; one or more side walls, wherein the one or more side walls define a cavity surrounding the speaker driver; as well as The backend, where: One or more resonators are attached to the rear end or a portion of the one or more side walls, and The one or more resonators and the cavity combine to form an acoustic cavity enclosing a volume of air.

2. The housing according to claim 1, wherein: A first resonator of the one or more resonators has a first resonant frequency within a first frequency range; A second resonator of the one or more resonators has a second resonant frequency within the first frequency range; and The first resonant frequency is different from the second resonant frequency.

3. The enclosure of claim 1, wherein the one or more resonators reduce fluctuations in a frequency response of the speaker.

4. The housing according to claim 3, wherein: The fluctuations occur within a first frequency range; and A first resonator of the one or more resonators has a first resonant frequency within a second frequency range; and The second frequency range falls within the first frequency range.

5. The housing of claim 1, wherein the one or more resonators include at least one Helmholtz resonator.

6. The housing of claim 1 , wherein the one or more resonators comprise: a first Helmholtz resonator comprising a first cavity having a first volume and a first port having a first cross-sectional area and a first length; as well as A second Helmholtz resonator includes a second cavity having a second volume and a second port having the first cross-sectional area and the first length.

7. The housing of claim 1 , wherein the one or more resonators comprise: a first Helmholtz resonator comprising a first cavity having a first volume and a first port having a first cross-sectional area and a first length; as well as A second Helmholtz resonator includes a second cavity having the first volume and a second port having a second cross-sectional area and a second length.

8. The enclosure of claim 1, wherein the one or more resonators form an acoustic metamaterial capable of absorbing sound waves.

9. A loudspeaker, comprising: a speaker driver comprising a cone, a pole and a magnet system; a housing, wherein the speaker driver and the housing define a cavity surrounding the speaker driver; as well as one or more resonators coupled to a portion of the housing, The one or more resonators and the cavity combine to form an acoustic cavity enclosing a volume of air.

10. The loudspeaker of claim 9, wherein: A first resonator of the one or more resonators has a first resonant frequency within a first frequency range; A second resonator of the one or more resonators has a second resonant frequency within the first frequency range; and The first resonant frequency is different from the second resonant frequency.

11. The loudspeaker of claim 9, wherein the one or more resonators reduce fluctuations in a frequency response of the loudspeaker.

12. The loudspeaker of claim 11, wherein: The fluctuations occur within a first frequency range; and A first resonator of the one or more resonators has a first resonant frequency within a second frequency range; and The second frequency range falls within the first frequency range.

13. The loudspeaker of claim 9, wherein: The one or more resonators are contained in a separate housing; and The separate housing includes an interface connecting the separate housing to a rear end of the housing.

14. The loudspeaker of claim 9, wherein: The magnet system and one or more side walls of the housing define an acoustic volume included in the cavity; and A first resonator of the one or more resonators is positioned on the one or more side walls along the acoustic volume.

15. A method comprising: manufacturing a housing for a speaker device, the housing comprising a front end, one or more side walls, and a rear end; adding a speaker driver to the housing, wherein the speaker driver and the housing define a cavity surrounding the speaker driver; as well as One or more resonators are coupled to the rear end or the one or more side walls of the housing, wherein the one or more resonators and the cavity combine to form an acoustic cavity enclosing a volume of air.

16. The method of claim 15, wherein the one or more resonators are coupled to the rear end or the one or more side walls of the housing prior to manufacturing the housing.

17. The method of claim 15, wherein: The one or more resonators include a plurality of resonators; A first resonator of the plurality of resonators is coupled to the rear end of the housing; and A second resonator of the plurality of resonators is coupled to the one or more side walls of the housing.

18. The method of claim 15, wherein the one or more resonators include at least one Helmholtz resonator.

19. The method of claim 15, further comprising: When manufacturing the housing, one or more ports are manufactured along at least one wall of the housing or along the rear end of the housing, Wherein coupling the one or more resonators to the rear end or the one or more side walls of the housing includes connecting each of the one or more resonators to a corresponding one of the one or more ports.

20. The method of claim 15, wherein the one or more resonators form an acoustic metamaterial capable of absorbing sound waves.

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