Quarter-wavelength wave trap structure suitable for earphone sound conduit

Abstract

The utility model belongs to the technical field of electroacoustics, and particularly relates to a quarter-wavelength wave trap structure suitable for earphone sound conduits, which aims to eliminate unnecessary harmonic waves and coupling peaks, is arranged on a main sound conduit of a sound production unit and comprises a plurality of branch sound conduits. One end of the main sound conduit is communicated with the sound production unit; one end of the branch sound conduit is communicated with the main sound conduit. The utility model has the advantages that the sound quality of the earphone is obviously improved, and excellent harmonic reduction and coupling peak suppression effects are provided.

Description

Technical Field

[0001] The utility model belongs to the technical field of electroacoustics, and in particular relates to a quarter-wavelength notch filter structure applicable to a headphone sound duct. Background Art

[0002] In many acoustic designs, a notch filter is an important component for changing the sound quality. It is mainly used to reduce or eliminate resonances within a specific frequency range, thereby improving the frequency response of the headphones.

[0003] In traditional headphone designs, especially in the mid to high frequency range, the coupling peak phenomenon is a common problem, which may originate from the sound duct or the sound generating unit. For example, due to the insufficient structural design of the sound duct, sound waves are reflected and interfered within the duct, overly enhancing the sound of certain frequencies, thus breaking the smoothness of the frequency response curve and affecting the sound quality balance. Current sound duct design methods often cannot effectively suppress this phenomenon. The sound ducts in traditional headphones usually adopt straight or simple bent pipe forms, which cannot effectively filter out unnecessary harmonic components and cannot avoid the occurrence of coupling peaks.

[0004] Therefore, a more refined sound duct design is needed to eliminate unnecessary harmonics and coupling peaks. Summary of the Utility Model

[0005] In view of the technical problems existing in the background art, the utility model provides a quarter-wavelength notch filter structure applicable to a headphone sound duct, which can eliminate unnecessary harmonics and coupling peaks.

[0006] To achieve the above object, the technical solution provided by the utility model is as follows:

[0007] A quarter-wavelength notch filter structure applicable to a headphone sound duct is provided on the main sound duct of the sound generating unit and includes a plurality of branch sound ducts;

[0008] One end of the main sound duct is connected to the sound generating unit; one end of the branch sound duct is connected to the main sound duct.

[0009] Preferably, a sound damping filter screen is provided at the connection between the main sound duct and the sound generating unit.

[0010] Preferably, the sound generating unit includes a housing and a sound generating component, and the sound generating component is arranged inside the housing.

[0011] Preferably, the sound generating component divides the interior of the housing into a front cavity of the sound generating unit and a rear cavity of the sound generating unit, and the front cavity of the sound generating unit is connected to the main sound duct.

[0012] Preferably, a front cavity pressure relief port is provided at the front cavity of the sound generating unit.

[0013] Preferably, a damping material is pasted on the front cavity pressure relief port.

[0014] Preferably, a rear cavity pressure relief port is provided at the rear cavity of the sound generating unit.

[0015] Preferably, a damping material is pasted on the rear cavity pressure relief port.

[0016] Preferably, the lengths of each of the branch sound conduits are respectively:

[0017]

[0018] wherein, L i is the length of the i-th branch sound conduit, and λ i is the sound absorption wavelength of the i-th branch sound conduit.

[0019] The present utility model has the following advantages and beneficial effects:

[0020] Through the structural design of the quarter-wavelength notch filter sound conduit, the present utility model significantly improves the sound quality performance of the in-ear headphones;

[0021] The present utility model utilizes the spiral pipe that precisely matches the resonance peak to effectively reduce unnecessary harmonics and coupling peaks, and at the same time realizes the fine regulation of sound waves in a specific frequency range to meet the personalized listening needs;

[0022] The present utility model significantly improves the sound quality of the headphones, provides excellent harmonic reduction and coupling peak suppression effects, and meets the market demand for high-quality audio equipment;

[0023] The present utility model can effectively eliminate the sound of a specific frequency required by designing the appropriate length of the branch sound conduit, is convenient to design and adjust, and has a wider application range. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the quarter-wavelength notch filter structure applicable to the headphone sound conduit provided in Embodiment 1 of the present utility model;

[0025] Figure 2 is a schematic structural diagram of an actual application case of the quarter-wavelength notch filter structure applicable to the headphone sound conduit provided in Embodiment 2 of the present utility model;

[0026] Reference numerals: 101 - main sound conduit, 102 - branch sound conduit, 103 - sound generating component, 104 - housing, 105 - rear cavity of the sound generating unit, 106 - rear cavity pressure relief port, 107 - front cavity pressure relief port, 108 - front cavity of the sound generating unit, 109 - sound damping filter screen, 110 - T-shaped sealing plug. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model.

[0028] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0029] Embodiment 1

[0030] This embodiment provides a quarter-wavelength notch filter structure applicable to a headphone sound duct, which is disposed on the main sound duct 101 of a sound generating unit and includes a plurality of branch sound ducts 102;

[0031] One end of the main sound duct 101 communicates with the sound generating unit; one end of the branch sound duct 102 communicates with the main sound duct 101. The other end of the main sound duct 101 is the headphone sound outlet.

[0032] In this embodiment, a sound damping filter screen 109 is disposed at the connection between the main sound duct 101 and the sound generating unit.

[0033] As a preferred solution, the sound generating unit includes a housing 104 and a sound generating component 103, and the sound generating component 103 is disposed inside the housing 104.

[0034] Based on the above solution, the sound generating component 103 can divide the interior of the housing 104 into a front cavity 108 of the sound generating unit and a rear cavity 105 of the sound generating unit, and the front cavity 108 of the sound generating unit communicates with the main sound duct 101.

[0035] Further, a front cavity pressure relief port 107 is disposed at the front cavity 108 of the sound generating unit. A damping material for adjusting air pressure can be attached to the front cavity pressure relief port 107.

[0036] On the other hand, a rear cavity pressure relief port 106 is disposed at the rear cavity 105 of the sound generating unit. A damping material for adjusting air pressure can be attached to the rear cavity pressure relief port 106.

[0037] In addition, the length of each of the branch sound ducts 102 is preferably respectively:

[0038]

[0039] wherein, L i is the length of the i-th branch sound duct, and λ i is the sound absorption wavelength of the i-th branch sound duct. It should be specifically noted that both the length and the number of the branch sound ducts are determined by the number of frequency points of the sound waves to be processed, and there may be one or multiple branch sound ducts for processing the sound waves of a certain frequency point.

[0040] The design principle of this embodiment is as follows:

[0041] When the sound wave propagates in the main sound duct, it will enter the quarter-wavelength notch filter structure composed of multiple branch sound ducts 102 connected in parallel to the main sound duct 101. When the quarter-wavelength of the sound wave matches the length of the branch sound duct 102, the sound wave will be reflected at the end of the duct. These reflected sound waves will interfere with the original sound wave to form a specific frequency, which is the so-called sound absorption frequency. Therefore, the length of each branch sound duct 102 is set to one quarter of the wavelength of the sound wave to be eliminated. Since the wavelength is the speed of sound wave propagation c divided by the frequency f, that is, the sound absorption frequency of the i-th branch sound duct is:

[0042]

[0043] When this sound absorption frequency matches the frequency of the sound source, it will cause the sound wave of a specific frequency to be reflected at the end of the duct and interfere with the original sound wave, thereby producing a sound absorption effect. This interference phenomenon will cause the energy of the sound wave to be significantly attenuated at a specific frequency.

[0044] It should be specifically noted that by adjusting the length of the branch sound duct 102, the sound absorption frequency can be precisely controlled. That is to say, by designing the appropriate length of the branch sound duct 102, effective sound absorption of a specific frequency can be achieved, so as to achieve the purpose of reducing unnecessary harmonics and coupling peaks. At the same time, this structure can also regulate the sound waves within a specific frequency range, realize the fine management and personalized adjustment of the overall frequency response, so as to meet the diverse needs of the market. And the sound generating unit of this embodiment can be any type such as a moving coil unit, a moving iron unit, a planar unit, etc.

[0045] Embodiment 2

[0046] This embodiment provides a practical application case of a quarter-wavelength notch filter structure applicable to the headphone sound duct based on Embodiment 1.

[0047] Refer to Figure 2, the quarter-wavelength notch filter structure of this embodiment can be precisely manufactured by 3D printing technology, ensuring the effective conduction of sound waves within the structure. Multiple side branch acoustic ducts 102 are designed as multiple bent ducts connected in parallel to the main acoustic duct 101. This design makes full use of the internal space of the structure and improves the overall efficiency of the components.

[0048] Specifically, to solve the problem of liquid residue that may occur during the construction of a closed structure in the 3D printing process, this embodiment has optimized the design of the structure. Specifically, an open structure with a reserved installation space for a T-shaped seal plug can be designed. Such a design allows the excess liquid to flow out freely, avoiding the risk of internal liquid accumulation. After printing, a T-shaped seal plug 110 is installed at the open structure of the T-shaped seal plug installation space at the end of the notch filter structure to seal the open port. This method not only ensures the tightness of the structure and the overall integrity but also solves the problems that may be caused by liquid accumulation in the closed space.

[0049] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A quarter - wavelength notch filter structure applicable to a headphone sound duct, which is arranged on the main sound duct (101) of a sounding unit, one end of the main sound duct (101) communicates with the sounding unit, and is characterized in that : including a plurality of branch acoustic ducts (102); One end of the branch acoustic duct (102) communicates with the main acoustic duct (101).

2. The quarter - wavelength notch filter structure applicable to the earphone sound guide tube according to claim 1, wherein: An acoustic damping filter screen (109) is provided at the connection between the main acoustic duct (101) and the sound generating unit.

3. A quarter - wavelength notch filter structure applicable to a headphone sound duct according to claim 1, characterized in that: The sound generating unit includes a housing (104) and a sound generating assembly (103), and the sound generating assembly (103) is disposed inside the housing (104).

4. A quarter - wavelength notch filter structure applicable to a headphone sound duct according to claim 3, characterized in that: The sound generating assembly (103) divides the interior of the housing (104) into a front cavity (108) and a rear cavity (105) of the sound generating unit, and the front cavity (108) of the sound generating unit communicates with the main acoustic duct (101).

5. A quarter-wavelength notch filter structure applicable to a headphone sound duct according to claim 4, characterized in that: A front cavity pressure relief port (107) is provided at the front cavity (108) of the sound generating unit.

6. The quarter-wavelength notch filter structure applicable to a headphone sound guide tube according to claim 5, characterized in that: A damping material is attached to the front cavity pressure relief port (107).

7. The quarter-wavelength notch filter structure applicable to a headphone sound duct according to claim 6, characterized in that: A rear cavity pressure relief port (106) is provided at the rear cavity (105) of the sound generating unit.

8. The quarter-wavelength notch filter structure applicable to a headphone sound duct according to claim 7, characterized in that: A damping material is attached to the rear cavity pressure relief port (106).

9. The quarter-wavelength notch filter structure applicable to a headphone sound guide tube according to claim 1, wherein: The lengths of each of the branch acoustic ducts (102) are respectively: Among them, L i is the length of the i-th side branch acoustic duct, and λ i is the sound absorption wavelength of the i-th side branch acoustic duct.

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