Compact acoustic device with adjustable frequency control

Abstract

An acoustic device (100) and a method of using the same. The sound channel (11) extends through the housing (10) of the acoustic device (100) between the sound inlet (11i) and the sound outlet (11o). The sound inlet (11i) is configured to receive a sound input (S i) from an external environment (Ex). The sound outlet (11o) is configured to convey the sound output (So) passing through the sound channel (11) to the ear canal (Ec). A resonant cavity (C) is enclosed within the housing (10) and is in acoustic communication with the sound channel (11) for inducing a corresponding acoustic resonance (A) in a frequency transmission spectrum (So / Si) of sound passing through the sound channel (11). The adjustment mechanism (12) is configured to adjust the size (L1, L2) of the resonant cavity (C) to control the frequency (F) of the acoustic resonance (A) in the frequency transmission spectrum (So / Si).

Description

Technical Field

[0001] The present disclosure relates to acoustic devices and methods of using such devices, such as by means of an adjustable resonant cavity or chamber to control the frequency transmission spectrum of sound through the acoustic device. Background Art

[0002] As background, WO 2018 / 117821 A1 describes an earplug and method for attenuating sound. A sound channel extends directly through the housing to guide sound within the ear canal. The sound channel comprises a channel segment sized to fit at least partially within the ear canal. The channel segment terminates on one side at a first external opening, allowing sound to enter the ear canal. The other side of the channel segment transitions into a first resonant volume with a relatively wide diameter. A second resonant volume terminates on one side at a second external opening and is separated from the first resonant volume by a sound-attenuating mesh on the other side. This creates a resonant cavity that compensates for the mesh's attenuation over a wide high-frequency range. In one embodiment, the two components of the earplug fit together at a controllable distance, defining a variable volume for the first resonant cavity. In this manner, the resonant frequency can be adjusted. For example, the components can be fitted together using a bayonet or threaded connection, where rotation of one component relative to the other determines the resonant volume and resonant frequency. Alternatively, a simple sliding connection can be provided, where, for example, the components fit tightly together. By allowing the user to control the volume of the resonant cavity, the corresponding resonant frequency can be tailored to the user's specific ear shape or preference.

[0003] As further background, US10,821,027B2 relates to a device for filtering sound, and in particular to a wearable device for notch filtering sound. The sound filtering device includes: an inlet port configured to be exposed to the environment to receive sound from the environment when the device is coupled to a portion of a user's ear; an outlet port configured to transmit sound passing through the device to the user's ear canal when the device is coupled to a portion of the user's ear; a channel extending between the inlet port and the outlet port to define a path for sound to propagate from the inlet port to the outlet port; a side port connected to the channel fluid; and a resonance chamber that deviates from the path defined by the channel and is connected to the channel fluid via the side port. The resonance chamber is configured to attenuate at least a portion of any sound passing through the channel that is within a frequency band narrower than the user's complete audible spectrum. The geometric volume of the resonance chamber is selectively adjustable. When the device is coupled to a portion of the user's ear, the resonance chamber is disposed outside the user's ear canal.

[0004] The present invention aims to alleviate the shortcomings of the prior art while retaining at least some of the advantages. For example, it is desirable to provide a compact acoustic device that can provide adaptive control of the frequency transmission spectrum. Summary of the Invention

[0005] Aspects of the present disclosure relate to an acoustic device and a method of using such a device. The acoustic device includes a housing having a sound channel extending through the housing between a sound inlet and a sound outlet. The sound inlet is configured to receive sound input from an external environment. The sound outlet is configured to transmit sound output through the sound channel to an ear canal. The acoustic device includes a resonant cavity enclosed in the housing. The resonant cavity is in acoustic communication with the sound channel. This may result in an acoustic resonance in a frequency transmission spectrum of sound passing through the sound channel. An adjustment mechanism is configured to adjust the size of the resonant cavity. This can be used to control the frequency of the acoustic resonance in the frequency transmission spectrum.

[0006] By enclosing the adjustable resonant cavity within the shell, the size of the resonant cavity can be changed without changing the size of the shell. For example, the adjustable resonant cavity can be completely enclosed within the fixed shell of the shell. Thus, the overall size or external dimensions of the acoustic device and / or the shell can be maintained while changing the internal size and / or volume of the resonant cavity. For example, instead of using an adjustable piston extending out of the shell, an adjustment mechanism can be used to control the internal size and / or volume of the resonant cavity without changing the overall size of the acoustic device. Preferably, the cavity is formed as part of the sound channel. By arranging the resonant cavity to be aligned with the sound channel and enclosed in the shell, the resonant cavity can be used to produce an acoustic resonance peak, for example to enhance the sound of the adjustable frequency. Other or additional methods of acoustically connecting the cavity to the sound channel can also be envisaged. By arranging the resonant cavity as a side branch of the sound channel enclosed in the shell, the resonant cavity can be used to produce an acoustic resonance drop, for example to attenuate the sound of the adjustable frequency.

[0007] By providing an adjustment mechanism configured to adjust the size of the resonance cavity within a continuous range of values ​​between a maximum size and a minimum size, the position of the acoustic resonance can be set to any desired value corresponding to the continuous range. By providing the resonance cavity with an adjustable length, the size of the resonance cavity can be easily set using the corresponding adjustment mechanism. By making the adjustment mechanism accessible from outside the housing, the size of the resonance cavity can be manually adjusted. Thus, the device does not require any battery power. Alternatively, an electric adjustment mechanism can be used. By providing the adjustment mechanism with a knob or slider, the size of the resonance cavity can be easily adjusted. By providing an indication of one or more corresponding sound settings, the user can control the device according to the indicated settings. For example, a scale can be indicated on the housing, for example where a knob or slider can be controllably moved to a specific setting.

[0008] By forming the resonance cavity as a tubular chamber extending along a circular trajectory, the housing can be kept relatively compact while allowing a relatively long resonance cavity. As a result, the acoustic resonance can be adjusted to a lower target frequency. The length of the tubular chamber along the circular trajectory can be adjusted by an adjustment mechanism to control the frequency of the acoustic resonance in the frequency transmission spectrum. For example, the adjustment mechanism may include and / or be coupled to a rotatable component of the acoustic device. By making the adjustment mechanism externally accessible from outside the housing, the size of the resonance cavity can be manually adjusted. As a result, the device does not require any battery power. Alternatively, an electric adjustment mechanism may be used. By providing the adjustment mechanism with a knob or slider, the size of the resonance cavity can be easily adjusted.

[0009] By forming a housing with different components, these components can move relative to each other to change the size of the resonance cavity. Preferably, the housing includes a rotatable component and a stationary component. Thus, the adjustment mechanism can cause the rotatable component to rotate relative to the stationary component, so that the rotation can change the size of the resonance cavity. For example, the rotatable component is configured to rotate relative to the stationary component along a circular trajectory, wherein the circular trajectory coincides with a portion of the sound channel forming the resonance cavity. When the first component of the housing rotates relative to the second component of the housing, by causing the first channel block in the sound channel to rotate along the circular trajectory, and when the first component of the housing rotates relative to the second component of the housing, the second channel block in the sound channel remains stationary, the variable length of the resonance cavity can be determined between the first channel block and the second channel block. By placing the corresponding channel blocks near the sound inlet and outlet, respectively, the channel can be prevented from further branching into dead space.

[0010] By fixedly connecting a movable (e.g. rotatable) part of the housing to the sound inlet, the position of the sound inlet can be changed. By fixedly connecting a static part of the housing to the sound outlet, the position of the sound outlet can be kept fixed, for example relative to the ear canal. In combination, the distance between the sound inlet and the sound outlet through the sound channel can be changed by moving the respective parts relative to each other. For example, the length of a resonance cavity formed to be aligned with the sound channel can be changed to change the frequency of the acoustic resonance. Alternatively or additionally, the sound inlet and the sound outlet can both be fixed relative to the static part of the housing, and the movable part can be used to change the size of the resonance cavity forming a side branch of the sound channel. By forming the sound outlet by an outlet part protruding from the housing, the part can be easily connected to any type of earplug. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] These and other features, aspects, and advantages of the apparatus, systems, and methods of the present disclosure will be better understood from the following description, appended claims, and accompanying drawings, in which:

[0012] Figure 1A showing a perspective view of a first acoustic device;

[0013] Figure 1B showing components within a housing of a first acoustic device;

[0014] Figure 1C and Figure 1D showing corresponding views of the adjustment mechanism of the first acoustic device arranged according to different settings;

[0015] Figure 2A showing a transparent perspective view of a second acoustic device;

[0016] Figure 2B and Figure 2C corresponding views showing the adjustment mechanism of the second acoustic device arranged according to different settings;

[0017] Figure 3A shows a perspective view of a third acoustic device;

[0018] Figure 3B shows an exploded view of a third acoustic device;

[0019] Figure 3C and Figure 3D shows a cross-sectional view of a third acoustic device;

[0020] Figure 4 shows a perspective view of a fourth acoustic device with various cross-sections at the indicated locations;

[0021] Figure 5A shows a transparent perspective view of a fifth acoustic device with cross-sections at the indicated locations;

[0022] Figure 5B showing the separated components of the fifth acoustic device;

[0023] Figure 6A and Figure 6B Shown are frequency transmission spectra through model acoustic devices with different resonance characteristics. DETAILED DESCRIPTION

[0024] The terms used to describe specific embodiments are not intended to limit the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms "a / an", "the" are also intended to include plural forms. The term "and / or" includes any and all combinations of one or more related listed items. It should be understood that the terms "include" and / or "comprise" specify the presence of the features described, but do not exclude the presence or addition of one or more other features. It should also be understood that when a particular step of a method is specified as being after another step, unless otherwise specified, it may be followed by the other step, or one or more intermediate steps may be performed before performing the particular step. Similarly, it should be understood that when describing a connection between structures or components, unless otherwise specified, the connection may be made directly or through an intermediate structure or component.

[0025] The present invention is described more fully herein below with reference to the accompanying drawings, in which embodiments of the invention are shown. For clarity, the absolute and relative sizes of systems, components, layers, and regions may be exaggerated in the accompanying drawings. The embodiments may be described with reference to schematic and / or sectional views of possible idealized embodiments and intermediate structures of the invention. In the specification and drawings, like numbers always refer to like elements. Relative terms and their derivatives should be interpreted as referring to the orientation described or shown in the drawings in question. These relative terms are for the purpose of greater clarity of description and do not require that the system be constructed or operated in a particular orientation unless otherwise stated.

[0026] 1 to 5 show an embodiment of an acoustic device 100. As shown, the acoustic device 100 includes a housing 10. A sound channel 11 extends through the housing 10 between a sound inlet 11i and a sound outlet 11o. The sound inlet 11i is configured to receive a sound input "Si" from an external environment "Ex". The sound outlet 11o is configured to transmit a sound output "So" passing through the sound channel 11 to an ear canal "Ec". A resonance cavity "C" is enclosed within the housing 10 and is acoustically connected to the sound channel 11. An adjustment mechanism 12 is configured to adjust the size of the resonance cavity "C".

[0027] Figure 6A and Figure 6BGraphs of frequency transmission spectra through model acoustic devices with different resonance characteristics are shown. In some embodiments, a resonant cavity "C," enclosed within housing 10 and acoustically connected to sound channel 11, is configured to induce a corresponding acoustic resonance "A" in the frequency transmission spectrum So / Si of sound passing through sound channel 11. In other or additional embodiments, adjustment mechanism 12 is configured to adjust the dimensions of resonant cavity "C" to control the frequency "F" of acoustic resonance "A" in the frequency transmission spectrum So / Si. For example, resonant cavity "C" may have one or more adjustable dimensions and / or an adjustable volume, thereby generating a tunable acoustic resonance "A."

[0028] In some embodiments, for example, Figure 6A As shown, the resonant cavity "C" is configured to induce a tunable acoustic resonance that forms a peak in the frequency transmission spectrum So / Si. This can be used, for example, to enhance speech or other sounds of interest. To achieve the desired effect, the peak is preferably at least 5 dB higher than the reference background R, more preferably at least 10 dB or more, for example, compared to the same configuration without the resonant cavity "C" and / or compared to the level at which the peak is maximally tuned to another frequency. In other or additional embodiments, for example, as Figure 6B As shown, the resonant cavity "C" is configured to induce a tunable acoustic resonance that forms a resonant dip in the frequency transmission spectrum So / Si, also known as an anti-resonance. This can be used, for example, to attenuate and / or filter unwanted sounds. To achieve the desired effect, the dip is preferably at least 10 dB, more preferably at least 20 dB, and most preferably at least 30 dB below the reference background R, e.g. compared to the same configuration without the resonant cavity "C" and / or compared to the level at which the peak is maximally tuned to another frequency. Furthermore, a combination of one or more peaks and one or more dips is also possible, e.g. using one or more (tunable) resonant cavities.

[0029] In some embodiments, the acoustic resonance "A" is tunable to be within the human audible spectrum and / or a frequency range associated with human speech. In other or additional embodiments, the (center) frequency "F" of the acoustic resonance "A" is tunable to be within the range between 20 Hz and 20,000 Hz (20 kHz), preferably between 80 Hz and 5 kHz. Most preferably, the resonant cavity "C" is tunable to induce the acoustic resonance "A" in a frequency range below 4 kHz. For reference, Figure 6A A series of resonance peaks are shown resulting from different lengths of the resonance cavity "C" aligned with the sound channel 11. For example, using a channel length L3 = 20 mm produces a peak above 4 kHz; using a channel length L2 = 25 mm produces a peak between 3 kHz and 4 kHz; and using a channel length L1 = 25 mm produces a peak below 3 kHz. Similarly, Figure 6BPeaks at different frequencies resulting from corresponding (Helmholtz) cavities having different depths are shown, with H1 being the maximum depth and H3 being the shallowest depth. Generally, it will be appreciated that to achieve a relatively low resonant frequency, the corresponding size and / or volume of the resonant cavity "C" may be relatively large. Advantageously, the various solutions described herein may mitigate excessive sizing of the acoustic device 100, for example by "curling" the size (e.g., length) of the resonant cavity "C," and in particular by arranging the length of the resonant cavity "C" along a circular path.

[0030] In some embodiments, for example, as shown in any of the embodiments of FIG. 1-FIG . 5 , the resonant cavity “C” is aligned with and / or arranged in series with the sound channel 11. In other words, the resonant cavity “C” can form part of the shortest acoustic path between the sound inlet 11i and the sound outlet 11o. For example, the resonant cavity aligned with the sound channel 11 can be used to provide an adjustable resonance peak in the frequency transmission spectrum So / Si, for example, Figure 6A As shown. In other or additional embodiments (not shown), the resonance cavity "C" is arranged in a side branch of the sound channel 11. For example, this can be a side branch of the shortest acoustic path between the sound inlet 11i and the sound outlet 11o. Such a side branch volume can act as a Helmholtz resonator. For example, as Figure 6B As shown, (anti-)resonant cavities in the side branches of the sound channel 11 can be used to provide an adjustable dip or anti-resonance in the frequency transmission spectrum.

[0031] In a preferred embodiment, for example, Figure 1C-1D or Figure 2B-2C As shown, the adjustment mechanism 12 is configured to adjust the dimensions L1, L2 of the resonance cavity "C" within a continuous range of values ​​ΔL between a maximum dimension L1 and a minimum dimension L2. Thus, the dimensions of the resonance cavity "C" can be set to any value within a continuous range. This can allow for precise tuning of the frequency transmission spectrum So / Si. For example, the dimensions of the resonance cavity "C" can be adjusted to a specific ear shape (e.g., ear canal size) and / or user preferences. Most preferably, the adjustable dimensions L1, L2 of the resonance cavity "C" include, or are substantially determined by, the adjustable length of the resonance cavity "C." For example, the characteristic length of the resonance cavity "C" can be determined by the longest dimension along the acoustic path of sound through the sound channel 11, such as the path between the respective channel blocks 11r, 11s and / or other restrictive structures (e.g., relatively narrow openings) and / or acoustic filter elements (e.g., meshes and / or membranes).

[0032] In a preferred embodiment, the adjustment mechanism 12 is accessible from the outside of the housing 10 for manually adjusting the dimensions L1, L2 of the resonance cavity "C". In some embodiments, the housing 10 includes different components, such as a first component 10r and a second component 10s, which are movable relative to each other. For example, the movement can change the dimensions L1, L2 of the resonance cavity "C". In a preferred embodiment, the first component 10r is rotatably connected relative to the second component 10s. For example, the adjustment mechanism 12 is configured to enable rotation of the first component 10r relative to the second component 10s. Most preferably, the rotation can be used to change the dimensions L1, L2 of the resonance cavity "C". In one embodiment, the first component 10r of the housing is fixedly connected to the sound inlet 11i. In another or additional embodiment, the second component 10s is fixedly connected to the sound outlet 11o.

[0033] In use, the sound outlet 11o (and therefore the second component 10s) can be fixed relative to the ear canal "Ec", while the first component 10r can rotate. In this respect, the first component 10r can be regarded as a rotatable component, and the second component 10s can be regarded as a static or fixed component. For example, the sound outlet 11o is formed by an outlet component 10o protruding from the housing for connection to an earplug 13, which is formed of an elastic material that fits into the ear canal, for example. Although Figure 1A-Figure 1D Universal earplugs are shown, but it will be appreciated that custom earplugs may also be used, eg, customized to fit a specific ear canal.

[0034] In a preferred embodiment, the first component 10r is configured to rotate relative to the second component 10s along a circular trajectory. For example, the circular trajectory coincides with a portion of the sound channel 11 forming the resonant cavity "C." More preferably, the resonant cavity "C" is formed by a tubular chamber extending along the circular trajectory. Most preferably, the length of the tubular chamber (e.g., along the circular trajectory) is adjustable by an adjustment mechanism 12 to control the frequency "F" of the acoustic resonance A in the frequency transmission spectrum So / Si. For example, the tubular chamber can be shaped like a portion of a circular ring. In some embodiments, the resonant cavity "C" is bounded at a first end of the circular trajectory by the first channel block 11r and at a second end by the second channel block 11s. For example, when the first component 10r of the housing 10 rotates relative to the second component 10s of the housing 10, the first channel block 11r is configured to rotate along the circular trajectory within the sound channel 11. In another or additional embodiment, when the first component 10r of the housing 10 rotates relative to the second component 10s of the housing 10, the second channel block 11s remains stationary within the sound channel 11.

[0035] In one embodiment, the first channel block 11r is positioned near the sound inlet 11i, for example, adjacent to the sound inlet. In another or additional embodiment, the second channel block 11s is positioned near the sound outlet 11o, for example, adjacent to the sound outlet. For example, the first channel block 11r is positioned within one centimeter, preferably within half a centimeter, more preferably within 0.2 cm, 0.1 cm, from the entrance of the sound inlet 11i into the resonance cavity "C," or flush with the entrance of the sound inlet 11i. For example, the second channel block 11s is positioned within one centimeter, preferably within half a centimeter, more preferably within 0.2 cm, 0.1 cm, from the exit of the resonance cavity "C" to the sound outlet 11o, or flush with the entrance of the sound inlet 11i.

[0036] In some embodiments, the housing 10 includes a sound filtering element, such as a mesh and / or a membrane, disposed between the sound inlet 11i and the resonance cavity "C," and / or between the resonance cavity "C" and the sound outlet 11o. For example, the sound filtering element is disposed at the entrance of the sound inlet 11i into the resonance cavity "C," and / or at the exit of the resonance cavity "C" to the sound outlet 11o. For example, such a sound filtering element can be used to more effectively limit the corresponding volume in the resonance cavity "C."

[0037] Aspects of the present disclosure may also be embodied as methods of using the acoustic device 100. Some embodiments include receiving sound from an external environment "Ex" through a sound inlet 11i of the acoustic device 100 and passing the sound through a sound channel 11 extending through a housing 10 of the acoustic device 100 to transmit the sound that has passed through the sound channel 11 to an ear canal "Ec" via a sound outlet 11o of the acoustic device 100. Other or additional embodiments include inducing an acoustic resonance "A" in a frequency transmission spectrum So / Si of sound passing through the sound channel 11 by a resonance cavity "C" enclosed within the housing 10 and acoustically connected to the sound channel 11. Advantageously, the adjustment mechanism 12 of the acoustic device 100 may be used to adjust the dimensions L1, L2 of the resonance cavity "C" to control the frequency "F" of the acoustic resonance "A" in the frequency transmission spectrum So / Si.

[0038] In some embodiments, for example, as shown in Figures 1 and 3, the adjustment mechanism 12 includes a knob or slider for adjusting the dimensions L1, L2 of the resonance cavity "C". In other or additional embodiments (not shown), corresponding indications of corresponding sound settings are printed on the housing 10 and / or the adjustment mechanism 12. For example, a scale for different sound settings can be printed on one or both of the housing 10 and / or the adjustment mechanism 12. In one embodiment, for example, Figure 1A-Figure 1D As shown, the sound inlet 11i forms a knob of the adjustment mechanism 12. In another or additional embodiment, for example, Figures 3A-3DAs shown, the sound inlet 11i is formed on the rotatable slider. In other or additional embodiments, for example, as shown in any one of Figures 2-5, the adjustment mechanism 12 includes and / or is coupled to a rotatable component 10r of the housing 10. In one embodiment, for example, Figure 2A-2C or Figure 5A-5B As shown, the sound inlet 11i is formed on the inner rotatable part 10r of the housing, which is rotatable relative to the outer static part 10s of the housing. In another or additional embodiment, for example, Figure 4 As shown, the rotatable part 10r and the static part 10s may be formed as upper and lower halves of an annular housing. It will therefore be understood that many variations are conceivable without departing from the scope of the present disclosure.

[0039] For the purpose of clarity and simplicity of description, features are described herein as being part of the same or separate embodiments, however, it is understood that the scope of the invention may include embodiments having combinations of all or some of the described features. For example, although an embodiment of a resonance cavity "C" aligned with the sound channel 11 is shown in the figures, variations thereof may be envisioned by those skilled in the art with the benefit of this disclosure to achieve similar functions and results. For example, the resonance cavity "C" shown in any of Figures 1-5 may be converted into a side branch / Helmholtz resonator depending on the placement of the sound inlet 11i and the sound outlet 11o relative to the resonance cavity "C". For example, Figure 1C 、 Figure 1D The sound inlet 11i is shown closed, and an alternative sound inlet (not shown) can be placed on the stationary part 10s of the housing 10, while the adjustment mechanism 12 can move the rotatable channel block 11r to determine the size of the side branch resonance cavity "C". Similar adjustments can be made to other embodiments.

[0040] In interpreting the appended claims, it should be understood that the word "comprising" does not exclude the presence of other elements or functions than those listed in a given claim; the word "a / an" preceding an element does not exclude the presence of a plurality of such elements; any figure marks in a claim do not limit its scope; several "means" may be represented by the same or different items or structures or functions implemented; unless expressly stated otherwise, any disclosed means or parts thereof may be combined together or separated into other parts. When one claim refers to another claim, this may indicate a synergistic advantage achieved by combining their corresponding features. However, the fact that certain measures are cited in mutually different claims does not indicate that a combination of these measures cannot be used to advantage. Therefore, the present embodiment may include all working combinations of the claims, where each claim may in principle refer to any previous claim unless the context clearly excludes it.

Claims

1. An acoustic device (100), comprising: Housing (10); a sound channel (11) extending through the housing (10) between a sound inlet (11i) configured to receive sound input (Si) from an external environment (Ex) and a sound outlet (11o) configured to transmit sound output (So) having passed through the sound channel (11) to an ear canal (Ec); a resonance cavity (C) enclosed within the housing (10) and in acoustic communication with the sound passage (11), for causing acoustic resonance (A) in a frequency transmission spectrum (So / Si) of sound passing through the sound passage (11); and An adjustment mechanism (12) is configured to adjust the size (L1, L2) of the resonance cavity (C) to control the frequency (F) of the acoustic resonance (A) in the frequency transmission spectrum (So / Si).

2. The acoustic device (100) according to claim 1, wherein The resonance cavity (C) is arranged to be aligned with the sound channel (11), forming a part of the shortest acoustic path between the sound inlet (11i) and the sound outlet (11o).

3. The acoustic device (100) according to claim 1, wherein The adjustment mechanism (12) is configured to adjust the size (L1, L2) of the resonant cavity (C) within a continuous range of values ​​(ΔL) between a maximum size (L1) and a minimum size (L2).

4. The acoustic device (100) according to claim 1, wherein The adjustable size (L1, L2) of the resonant cavity (C) is determined by the adjustable length of the resonant cavity (C).

5. The acoustic device (100) according to claim 1, wherein The resonance cavity (C) is formed by a tubular chamber extending along a circular trajectory, wherein the length of the tubular chamber along the circular trajectory can be adjusted by the adjustment mechanism (12) to control the frequency (F) of the acoustic resonance (A) in the frequency transmission spectrum (So / Si).

6. The acoustic device (100) according to claim 1, wherein The adjustment mechanism (12) includes or is coupled to a rotatable component of the acoustic device (100).

7. The acoustic device (100) according to claim 1, in, The housing (10) comprises a first component (10r) and a second component (10s), wherein the first component (10r) is rotatably connected relative to the second component (10s); wherein the adjustment mechanism (12) is configured to achieve rotation of the first component (10r) relative to the second component (10s); The rotation changes the dimensions (L1, L2) of the resonant cavity (C).

8. The acoustic device (100) according to claim 7, wherein The first component (10r) is configured to rotate relative to the second component (10s) along a circular trajectory, wherein the circular trajectory coincides with a portion of the sound channel (11) forming the resonance cavity (C).

9. The acoustic device (100) according to claim 7, wherein The first part (10r) of the housing is fixedly connected to the sound inlet (11i), and the second part (10s) is fixedly connected to the sound outlet (11o).

10. The acoustic device (100) according to claim 8, in, The resonant cavity (C) is delimited by a first channel block (11r) at a first end of the circular trajectory and by a second channel block (11s) at a second end of the circular trajectory; wherein, when the first part (10r) of the housing (10) rotates relative to the second part (10s) of the housing (10), the first channel block (11r) is configured to rotate within the sound channel (11) along the circular trajectory; Wherein, when the first part (10r) of the housing (10) rotates relative to the second part (10s) of the housing (10), the second channel block (11s) remains stationary in the sound channel (11).

11. The acoustic device (100) according to claim 10, wherein The first channel block (11r) is arranged adjacent to the sound inlet (11i); and the second channel block (11s) is arranged adjacent to the sound outlet (11o).

12. The acoustic device (100) according to claim 1, wherein The adjustment mechanism (12) is accessible from outside the housing (10) and is used to manually adjust the size (L1, L2) of the resonance cavity (C).

13. The acoustic device (100) according to claim 1, wherein The adjustment mechanism (12) comprises a knob or a slider for adjusting the size (L1, L2) of the resonance cavity (C).

14. The acoustic device (100) according to claim 1, wherein The sound outlet (11o) is formed by an outlet component (10o) protruding from the housing and is used for connecting to an earplug (13).

15. A method of using an acoustic device (100), the method comprising: receiving sound from an external environment (Ex) via a sound inlet (11i) of the acoustic device (100), and passing the sound through a sound passage (11) extending through a housing (10) of the acoustic device (100), so as to transmit the sound passing through the sound passage (11) into an ear canal (Ec) via a sound outlet (11o) of the acoustic device (100); Inducing acoustic resonance (A) in the frequency transmission spectrum (So / Si) of sound passing through the sound passage (11) through a resonance cavity (C) enclosed in the housing (10) and acoustically connected to the sound passage (11); and The adjustment mechanism (12) of the acoustic device (100) is used to adjust the size (L1, L2) of the resonance cavity (C), thereby controlling the frequency (F) of the acoustic resonance (A) in the frequency transmission spectrum (So / Si).

16. The method according to claim 15, wherein Adjusting the dimensions (L1, L2) of the resonant cavity (C) includes rotating a first part (10r) of the housing (10) relative to a second part (10s) of the housing (10), wherein the rotation changes the dimensions (L1, L2) of the resonant cavity (C).

17. The method according to claim 16, wherein The first part (10r) of the housing (10) rotates along a circular trajectory that coincides with a portion of the sound passage (11) forming the resonance chamber (C).

18. The method according to claim 16, wherein A first part (10r) of the housing (10) is fixedly connected to the sound inlet (11i), a second part (10s) of the housing (10) is fixedly connected to the sound outlet (11o), and relative rotation between the first part (10r) and the second part (10s) changes the resonance cavity (C).

19. The method according to claim 17, wherein The resonant cavity (C) is bounded at a first end of the circular trajectory by a first channel block (11r) and at a second end by a second channel block (11s); wherein rotating the first component (10r) causes the first channel block (11r) to move along the circular trajectory, thereby adjusting the resonant cavity (C); and the second channel block (11s) remains stationary during rotation.

20. The method according to claim 19, wherein The first channel block (11r) is adjacent to the sound inlet (11i), and the second channel block (11s) is adjacent to the sound outlet (11o).

Images