Speaker assembly and mobile terminal

Abstract

The present disclosure relates to a speaker assembly and a mobile terminal, wherein the speaker assembly is applied to a mobile terminal, the speaker assembly includes a sound absorbing device, the sound absorbing device includes a sound absorbing component with a cavity structure, the cavity of the sound absorbing component is filled with sound absorbing material; the proportional relationship between the size of the sound absorbing component and the filling amount of the sound absorbing material satisfies the requirement that the sound absorbing component absorbs sound at a specified sound absorbing frequency. When it is necessary to absorb a specified sound absorbing frequency, the size of the sound absorbing component can be changed by changing the filling amount of the sound absorbing material filled in the sound absorbing component of the sound absorbing device. Therefore, different mobile terminals can adjust the size of the sound absorbing component according to the stacking situation inside the mobile terminal while satisfying the requirement of absorbing the specified sound absorbing frequency.

Description

Technical Field

[0001] The present disclosure relates to the field of acoustics, and in particular to a speaker assembly and a mobile terminal. Background Art

[0002] Mobile terminals such as mobile phones and computers have become an indispensable part of people's daily lives. With the development of technology, the functions of these mobile terminals are becoming more and more numerous and more complete. Users hope to achieve dual-channel stereo sound quality in full-screen mobile phones. To do this, a front cavity needs to be designed inside the mobile phone to guide the sound to the narrow slit of the screen. This design will cause resonance peaks in sounds of certain frequencies, which will have a negative impact on the sound effects and affect the user experience. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a speaker assembly and a mobile terminal.

[0004] According to a first aspect of an embodiment of the present disclosure, there is provided a speaker assembly, which is applied to a mobile terminal. The speaker assembly includes a sound absorbing device, wherein the sound absorbing device includes a sound absorbing component having a cavity structure, and the cavity of the sound absorbing component is filled with sound absorbing material. The proportional relationship between the size of the sound absorbing component and the filling amount of the sound absorbing material satisfies the requirement that the sound absorbing component absorbs sound at a specified sound absorption frequency.

[0005] In some embodiments, the sound absorbing component includes a plurality of sound absorbing pipes of different lengths; there is a first relationship between the size of each of the sound absorbing pipes, the amount of sound absorbing material filled in each of the sound absorbing pipes, and the sound absorbing frequency of each of the sound absorbing pipes;

[0006] The first relationship is:

[0007]

[0008] Among them, the f p is the sound absorption frequency of each of the first sound absorbing pipes; n is the high-order resonance number of each of the first sound absorbing pipes; L p is the length of each of the first sound absorbing pipes; d is the diameter of each of the first sound absorbing pipes; v p The sound velocity is determined based on the filling amount of the sound absorbing material filled in each of the first sound absorbing pipes.

[0009] In some embodiments, the specified sound absorption frequency also includes a plurality of sound absorption frequencies corresponding to the plurality of first sound absorption pipes; the sound absorption frequencies of the plurality of first sound absorption pipes satisfy a model relationship determined by using porous material acoustics based on a finite element method and thermoviscous acoustics.

[0010] In some embodiments, the sound absorbing component includes a plurality of second sound absorbing pipes of the same or different lengths and a plurality of sound absorbing cavities of the same or different volumes, each of the second sound absorbing pipes and the corresponding sound absorbing cavity forming a Helmholtz resonator; a second relationship exists between the size of the Helmholtz resonator, the amount of sound absorbing material filled in the Helmholtz resonator, and the sound absorption frequency of the Helmholtz resonator;

[0011] The second relationship is:

[0012]

[0013] Among them, the f H is the sound absorption frequency of the Helmholtz resonator; S is the opening area of ​​the second sound absorption pipe; V is the volume of the sound absorption cavity; L is the length of the second sound absorption pipe; v H The velocity of sound is determined based on the filling amount of the sound absorbing material filled in the Helmholtz resonator.

[0014] In some embodiments, the specified sound absorption frequency also includes the sound absorption frequency of the Helmholtz resonator; the sound absorption frequencies of the Helmholtz resonator satisfy a model relationship determined by using porous material acoustics based on a finite element method and thermoviscous acoustics.

[0015] In some embodiments, the speaker assembly further includes a front cavity; the designated sound absorption frequency is determined based on a high-frequency resonance peak frequency value of the front cavity, and the high-frequency resonance peak frequency value is determined by simulation based on a shape and size of the front cavity.

[0016] In some embodiments, the designated sound absorption frequency is within a frequency range determined based on the high frequency resonance peak frequency value.

[0017] In some embodiments, the sound absorption frequencies corresponding to the plurality of first sound absorption pipes constitute one or more sound absorption segments, each of the sound absorption segments includes one or more sound absorption frequencies corresponding to the first sound absorption pipes; and each of the sound absorption segments corresponds to a plurality of the first sound absorption pipes and has a plurality of the sound absorption frequencies uniformly arranged therein.

[0018] According to a second aspect of an embodiment of the present disclosure, a mobile terminal is provided, comprising the speaker assembly according to the first aspect.

[0019] In some embodiments, the sound absorbing device is disposed in a gap between a rear shell and a middle frame in the mobile terminal.

[0020] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the size of the sound-absorbing component with a cavity structure in the sound-absorbing device has a proportional relationship with the sound-absorbing material filled in the cavity of the sound-absorbing component, and the proportional relationship satisfies the requirement that the sound-absorbing component absorbs sound at a specified sound-absorbing frequency. Therefore, when it is necessary to absorb a specified sound-absorbing frequency, the size of the sound-absorbing component can be changed by changing the filling amount of the sound-absorbing material filled in the sound-absorbing component of the sound-absorbing device. Therefore, different mobile terminals can adjust the size of the cavity structure of the sound-absorbing component according to the stacking situation inside the mobile terminal while satisfying the requirement of absorbing the specified sound-absorbing frequency.

[0021] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0023] Figure 1 is a schematic diagram of a speaker assembly according to an exemplary embodiment.

[0024] Figure 2 is a schematic diagram of a speaker assembly according to another exemplary embodiment.

[0025] Figure 3 The figure is a schematic diagram of a mobile terminal according to an exemplary embodiment.

[0026] Figure 4 The figure is a sound curve diagram of a mobile terminal according to an exemplary embodiment.

[0027] Figure 5 It is a comparison diagram between the design and result of the sound absorption coefficient of the sound absorbing component according to an exemplary embodiment.

[0028] Figure 6 The present invention is a flowchart of an audio processing circuit of a mobile phone according to an exemplary embodiment.

[0029] Figure 7 The invention discloses a working principle of a speaker circuit according to an exemplary embodiment.

[0030] Figure 8 The figure is a schematic diagram of a mobile phone circuit board according to an exemplary embodiment. DETAILED DESCRIPTION

[0031] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0032] Figure 3 4 is a schematic diagram of a mobile terminal according to an exemplary embodiment, wherein the mobile terminal 40 may be an electronic product with a speaker such as a mobile phone, a computer, a telephone watch, etc.

[0033] The mobile terminal 40 may include: a housing 41 and a speaker assembly. The speaker assembly is disposed inside the housing 41. The housing 41 may be disposed on the outer layer of the mobile terminal 40, and the housing 41 may be made of a metal material. The housing 41 is provided with an opening corresponding to the speaker 10, so that the speaker 10 emits sound to the outside of the mobile terminal 40.

[0034] Sound is transmitted through a medium. Sound can only be produced by the vibration of an object. Sound is the fluctuation generated by the vibration of matter, that is, sound waves, which need to be transmitted through a medium to be heard. The speed at which sound waves are transmitted in a medium is called the speed of sound (or the speed of sound). Sound propagates at different speeds in different media. The speed of sound propagation in air is 340m / s. Frequency is the number of times a sound wave completes a periodic change per unit time. It is a quantity that describes the frequency of periodic motion. Different sounds have different frequencies.

[0035] Users expect mobile terminals to have dual-channel stereo sound quality. In full-screen mobile phones, a front cavity needs to be designed to guide the sound to the narrow slit of the screen. This design will cause resonance peaks in sounds of certain frequencies, which will have a negative impact on the sound quality and affect the user experience.

[0036] To solve the above problems, Figure 1 and Figure 2 As shown, the present disclosure provides an exemplary speaker assembly. Figure 1 and Figure 2 As shown, the speaker assembly includes a speaker 10 and a sound absorbing device 20. The speaker 10 is used to emit sound. The sound absorbing device 20 includes a sound absorbing component with a cavity structure, and the cavity of the sound absorbing component is filled with a sound absorbing material. The sound absorbing material can be sound absorbing foam, zeolite powder, etc. After the sound absorbing material is filled, according to Biot's porous material equivalent theory, the equivalent sound velocity of the sound in the sound absorbing component is reduced.

[0037] Through the above structure, when it is necessary to absorb a specified sound absorption frequency, the filling amount of the sound absorbing material filled in the sound absorbing component of the sound absorbing device 20 is changed to change the sound velocity of the sound in the sound absorbing component, thereby changing the size of the sound absorbing component. Therefore, different mobile terminals 40 can adjust the size of the sound absorbing component according to the stacking conditions inside the mobile terminals 40 while meeting the requirement of absorbing the specified sound absorption frequency.

[0038] The proportional relationship between the size of the sound absorbing component and the filling amount of the sound absorbing material satisfies the requirement that the sound absorbing component absorbs sound at a specified sound absorbing frequency. The specified sound absorbing frequency can be understood as one or more sound absorbing points in the sound absorbing frequency segment where the sound absorbing device 20 is to absorb sound. The sound absorbing frequency segment can be a sound absorbing segment range composed of a plurality of different sound absorbing points.

[0039] The sound absorbing frequency band may include as many designated sound absorbing points as possible. Therefore, the sound absorbing device 20 can absorb sounds in different sound frequency bands, thereby preventing the sound emitted by the speaker 10 from resonating with the housing of the mobile terminal 40, so as to achieve a better sound absorbing effect and provide users with a good user experience.

[0040] In some embodiments, the speaker 10 includes a front cavity 13 and a sound leakage hole 11 .

[0041] In some embodiments, the designated sound absorption frequency is determined based on the high-frequency resonance peak frequency value of the front cavity 13, and the high-frequency resonance peak frequency value is determined by simulation based on the shape and size of the front cavity 13. Among them, different models of mobile terminals 40 have different stacking methods of internal electronic components, so the volume, shape and size of the front cavity 13 left for the speaker 10 are different.

[0042] Reference data such as the shape and size of the front cavity 13 are input into the simulation software to obtain the high-frequency resonance peak frequency value of the front cavity 13. The designated sound absorption frequency of the sound absorbing component in the sound absorbing device 20 of the loudspeaker 10 is determined according to the high-frequency resonance peak frequency value of the front cavity 13. That is, different shapes and sizes of the front cavity 13 result in different high-frequency resonance peak frequency values, and ultimately different designated sound absorption frequencies.

[0043] In some embodiments, the designated sound absorption frequency is located in a frequency range determined based on the high-frequency resonance peak frequency value. As can be seen from the above content, the designated sound absorption frequency is a sound absorption band range composed of a plurality of different sound absorption points. Therefore, the designated sound absorption frequency can be a sound absorption frequency within a frequency band formed by moving to the left and right sides of the high-frequency resonance peak frequency value with the high-frequency resonance peak frequency value as the center point.

[0044] Specifically, the designated sound absorption frequency can be a frequency band range value formed by moving 1kHz to the left and right sides of the high-frequency resonance peak frequency value with the high-frequency resonance peak frequency value as the center point. The absorption frequencies of the first sound absorption pipes 21 of different lengths are different. The absorption frequencies of the first sound absorption pipes 21 together form a 2kHz sound absorption range formed with the high-frequency resonance peak frequency value as the center, ensuring that the sound frequencies near the high-frequency resonance peak frequency value can be absorbed.

[0045] Furthermore, if Figure 4 As shown, the horizontal axis is the frequency (Hz) of the sound, and the vertical axis is the decibel (dB) of the sound; according to the shape and size of the front cavity 13 of the speaker 10, the sound frequency and decibel of the front cavity 13 of the speaker 10 are measured by acoustic simulation software, and a sound frequency curve of the front cavity 13 is drawn. According to the sound frequency curve, and using the acoustic simulation model, the high-frequency resonance peak frequency value of the front cavity 13 is determined.

[0046] like Figure 4 As shown, curve a is a frequency curve when the sound absorbing component is not provided with sound absorbing material, and curve b is a frequency curve when the sound absorbing component is provided with sound absorbing material. The highest value in curve a is the high-frequency resonance peak frequency value determined according to the shape and size of the front cavity 13.

[0047] In some embodiments, one end of the sound absorbing device 20 is an open end, which is connected to the sound leakage hole 11 of the speaker 10, and the other end is a closed end. The sound emitted by the speaker 10 enters the first sound absorbing pipe 21 or the second sound absorbing pipe 23 and the sound absorbing cavity 24 through the sound leakage hole 11. When the sound enters a closed cavity, the sound of a specific frequency will be eliminated.

[0048] In the first embodiment, if Figure 1 As shown, the sound absorbing component in the sound absorbing device 20 includes an air cavity 22 and a plurality of first sound absorbing pipes 21 of different lengths.

[0049] In the second embodiment, the sound absorbing component of the sound absorbing device 20 includes an air cavity 22 and a plurality of second sound absorbing pipes 23 with the same or different lengths and sound absorbing cavities 24 with the same or different volumes.

[0050] Specifically, Figure 2 As shown, the sound absorbing component of the sound absorbing device 20 may include an air cavity 22, a plurality of second sound absorbing pipes 23 of the same length, and sound absorbing chambers 24 of different volumes. The sound absorbing component of the sound absorbing device 20 may include an air cavity 22, a plurality of second sound absorbing pipes 23 of different lengths, and sound absorbing chambers 24 of the same volume. The sound absorbing component of the sound absorbing device 20 may include an air cavity 22, a plurality of second sound absorbing pipes 23 of different lengths, and sound absorbing chambers 24 of different volumes.

[0051] As can be seen from the above content, the designated sound absorption frequency is determined according to the high-frequency resonance peak frequency value. In the first embodiment, the designated sound absorption frequency includes the sum of the sound absorption frequencies of the plurality of first sound absorption pipes 21; in the second embodiment, the designated sound absorption frequency includes the sum of the sound absorption frequencies of the plurality of second sound absorption pipes 23 and the plurality of sound absorption cavities 24.

[0052] The sound absorbing device 20 absorbs the sound of the frequency corresponding to the high-frequency resonance peak frequency value emitted by the sound leakage hole 11, so that the one or more first sound absorbing pipes 21 or the second sound absorbing pipes 23 and the sound absorbing cavity 24 located in the rear cavity absorb the sound at the high-frequency resonance peak frequency value. Because of the conservation of energy, the sound pressure level at the high frequency will be compensated. In this way, the appearance of the high-frequency resonance peak can be avoided, the sound effect of the speaker 10 in the mobile terminal 40 is guaranteed, and a good user experience is guaranteed.

[0053] In the first embodiment, Figure 1 As shown, the sound absorbing device 20 includes a plurality of first sound absorbing pipes 21 of different lengths and an air cavity 22; in this case, the specified sound absorbing frequency includes a plurality of sound absorbing frequencies corresponding to the plurality of first sound absorbing pipes 21. The sound absorbing frequencies of the plurality of first sound absorbing pipes 21 of different lengths satisfy a model relationship determined by using porous material acoustics based on the finite element method and thermoviscous acoustics.

[0054] Specifically, after the plurality of first sound absorbing pipes 21 are connected to the air cavity 22, the sound absorbing points of each first sound absorbing pipe 21 will be slightly offset. The finite element analysis method can be used in combination with thermoviscous acoustics and Biots porous material acoustics to establish a model for the plurality of first sound absorbing pipes 21.

[0055] In some embodiments, the sound absorption frequencies corresponding to the plurality of first sound absorption pipes 21 constitute one or more sound absorption segments, each of which includes the sound absorption frequencies corresponding to one or more sound absorption pipes; and each sound absorption segment includes a plurality of sound absorption frequencies uniformly arranged in correspondence to the plurality of sound absorption pipes.

[0056] By providing a plurality of first sound absorbing pipes 21 of different lengths, each first sound absorbing pipe 21 absorbs different sound absorbing frequencies. The sound absorbing device 20 absorbs sounds of different frequencies, ensuring that the sound at the rear of the speaker 10 does not cause vibration of the rear shell of the mobile terminal 40, so that the user has a good user experience.

[0057] In the first embodiment, sound absorbing materials are filled in the first sound absorbing pipes 21. There is a first relationship between the size of each first sound absorbing pipe 21, the amount of sound absorbing materials filled in each first sound absorbing pipe 21, and the sound absorption frequency of each first sound absorbing pipe 21. In some embodiments, the first relationship is:

[0058]

[0059] Among them, f p is the sound absorption frequency of each first sound absorbing pipe 21; n is the high-order resonance order of each first sound absorbing pipe 21; L p is the length of each first sound absorbing pipe 21; d is the diameter of each first sound absorbing pipe 21; v p It is a sound velocity determined based on the filling amount of the sound absorbing material filled in each first sound absorbing duct 21 .

[0060] After the first sound absorbing pipe 21 is filled with the sound absorbing material, the sound velocity of the sound in the first sound absorbing pipe 21 becomes lower, that is, v p From the above first relationship, it can be seen that when the length L of the first sound absorbing duct 21 p If v p Reduced, so that the sound absorption frequency f of the first sound absorption pipe 21 p It will decrease.

[0061] If the sound absorption frequency f is specified p After the first sound absorbing pipe 21 is filled with the sound absorbing material, v p If the length L of the first sound absorbing pipe 21 is reduced, the length L of the first sound absorbing pipe 21 should also be reduced. p Or the diameter d of the first sound absorbing duct 21. Therefore, by adding the sound absorbing material in the first sound absorbing duct 21, the length or diameter of the first sound absorbing duct 21 can be reduced.

[0062] Specifically, if the first sound absorbing pipe 21 makes the sound velocity in the first sound absorbing pipe 21 become half of the original one according to the filling amount of the sound absorbing material filled, under the condition of keeping the specified sound absorbing frequency unchanged, in the first relationship, the length and diameter of the first sound absorbing pipe 21 can be reduced to half of the original one. Thus, the sound absorbing component of the whole sound absorbing device 20 is smaller, lighter and thinner, and finally can be installed inside the mobile terminal 40 with a narrow internal space.

[0063] In addition, according to the first relationship, the length L of the first sound absorbing duct 21 p Under the condition that the diameter d of the first sound absorbing pipe 21 is constant, the sound absorption frequency f of the first sound absorbing pipe 21 is different. p The larger the diameter of the first sound absorbing pipe 21, the higher the sound absorbing frequency f p The smaller the diameter of the first sound absorbing pipe 21, the sound absorbing frequency f p The bigger it is.

[0064] It should be noted that the above first relationship can be used for preliminary calculation and theoretical analysis. When multiple first sound absorbing pipes 21 of different lengths are connected to the air cavity 22, the sound absorbing points of each first sound absorbing pipe 21 will be slightly offset. At this time, the finite element analysis method is used in conjunction with thermoviscous acoustics, and the Biots porous material acoustic theory is used to model the first sound absorbing pipe 21.

[0065] In the second embodiment, Figure 2 As shown, the sound absorbing device 20 includes a plurality of second sound absorbing pipes 23 of the same length and a plurality of sound absorbing cavities 24 of different volumes, and the number of the second sound absorbing pipes 23 corresponds to the number of the sound absorbing cavities 24. Each second sound absorbing pipe 23 corresponds to a sound absorbing cavity 24. The sound absorbing cavity 24 is located at one end of the second sound absorbing pipe 23 away from the air cavity 22. The width of the sound absorbing cavity 24 is greater than the width of the second sound absorbing pipe 23. At this time, the second sound absorbing pipe 23 and the sound absorbing cavity 24 form a Helmholtz resonator.

[0066] In the second embodiment, the sound absorbing device 20 includes a plurality of Helmholtz resonators; in this case, the designated sound absorbing frequency includes a plurality of sound absorbing frequencies corresponding to the plurality of Helmholtz resonators. The sound absorbing frequencies of the plurality of Helmholtz resonators satisfy a model relationship determined by using porous material acoustics based on the finite element method and thermoviscous acoustics.

[0067] Specifically, after the multiple Helmholtz resonators are connected to the air cavity 22, the sound absorption point of each Helmholtz resonator will shift slightly. The finite element analysis method can be used in combination with thermoviscous acoustics and Biots porous material acoustics to establish a model for the multiple Helmholtz resonators.

[0068] There is a second relationship between the size of the Helmholtz resonator, the amount of sound absorbing material filled in the Helmholtz resonator, and the sound absorption frequency of the Helmholtz resonator. The second relationship is:

[0069]

[0070] Among them, the f H is the sound absorption frequency of the Helmholtz resonator; S is the opening area of ​​the second sound absorption pipe 23; V is the volume of the sound absorption cavity 24; L is the length of the second sound absorption pipe 23; v H It is a sound velocity determined based on the filling amount of the sound absorbing material filled in the Helmholtz resonator.

[0071] After the second sound absorbing pipe 23 and the sound absorbing cavity 24 are filled with the sound absorbing material, according to Biot's porous material equivalent theory, the equivalent sound velocity of the sound in the Helmholtz resonator is reduced, that is, the sound velocity v of the sound in the Helmholtz resonator is reduced. HFrom the above second relationship, it can be seen that when the length L of the second sound absorbing pipe 23 remains unchanged or the volume V of the sound absorbing cavity 24 remains unchanged, v H Reduced, so that the sound absorption frequency f of the second sound absorption pipe 23 H It will decrease.

[0072] If the sound absorption frequency f is specified H After the second sound absorbing pipe 23 or the sound absorbing cavity 24 is filled with the sound absorbing material, the length L of the second sound absorbing pipe 23 or the volume V of the sound absorbing cavity 24 can be reduced. Therefore, by adding the sound absorbing material to the second sound absorbing pipe 23 or the sound absorbing cavity 24, the length of the second sound absorbing pipe 23 or the volume of the sound absorbing cavity 24 can be reduced, so that the sound absorbing component of the overall sound absorbing device 20 is smaller, thinner, and finally can be installed inside the mobile terminal 40 with a narrow internal space.

[0073] Furthermore, in the second relationship, the sound absorption frequency of the Helmholtz resonator can be calculated according to the range of the specified absorption frequency, the opening area of ​​the second sound absorption pipe 23, the average length of the second sound absorption pipe 23, the propagation speed of the sound in the Helmholtz resonator, and the volume of the sound absorption cavity 24. When the absorption frequency remains unchanged, the overall volume of the Helmholtz resonator can be adjusted within a suitable range by adjusting the opening area of ​​the second sound absorption pipe 23, the length of the second sound absorption pipe 23, or the volume of the sound absorption cavity 24.

[0074] Furthermore, according to the filling amount of the sound absorbing material filled in the Helmholtz resonator, when the sound velocity of the Helmholtz resonator becomes half of the original, in the second relationship, the volume of the sound absorbing cavity 24 or the length of the second sound absorbing duct 23 can be reduced to one quarter of the original, or the volume of the sound absorbing cavity 24 or the length of the second sound absorbing duct 23 can be reduced to one half of the original at the same time. Therefore, the sound absorbing component of the overall sound absorbing device 20 is made smaller, thinner, and finally can be installed inside the mobile terminal 40 with a narrow internal space.

[0075] Furthermore, if Figure 5 The following is a comparison chart of the design and result of the sound absorption coefficient of the sound absorbing component. Figure 5 In the figure, the ordinate represents the sound absorption coefficient and the abscissa represents the frequency of the sound. A sound absorption coefficient of 1 means that the sound at this frequency is 100% absorbed.

[0076] Take the first embodiment as an example to illustrate. Figure 5 In the figure above, there are curves with multiple different peaks. Each peak represents the sound absorption frequency of a first sound absorption pipe 21. In this embodiment, the sound absorption component has multiple first sound absorption pipes 21 with different lengths. The lengths of the first sound absorption pipes 21 are different, and the sound absorption frequencies are also different. Therefore, each first sound absorption pipe 21 corresponds to a peak. Figure 5 The upper part shows a curve with multiple different peaks.

[0077] exist Figure 5 In the figure below, there is a curve composed of multiple sound absorption points. Each sound absorption point corresponds to a first sound absorption pipe 21. As many designated sound absorption points as possible are filled, that is, as many sound absorption points corresponding to the multiple first sound absorption pipes 21 in the mobile terminal 40 as possible are set in the designated sound absorption frequency band, so that multiple narrow-band sound absorption points can form a wide sound absorption band gap to achieve a better sound absorption effect.

[0078] For example, in the sound frequency range of 300-1200 Hz, the sound frequency range of 300-1200 Hz can be divided into one or more sound absorbing segments, for example, into three segments: 300-600 Hz, 600-900 Hz and 900-1200 Hz.

[0079] In each sound absorption band, there is a sound absorption frequency corresponding to one or more sound absorption pipes. For example, in the frequency band of 300-600 Hz, 30 first sound absorption pipes 21 can be corresponding; in the frequency band of 600-900 Hz, 30 first sound absorption pipes 21 can be corresponding; in the frequency band of 900-1200 Hz, 30 first sound absorption pipes 21 can be corresponding. In addition, the multiple first sound absorption pipes 21 corresponding to each sound absorption band are evenly distributed with the sound absorption points in the sound absorption band. For example, in the frequency band of 300-600 Hz, there are 30 first sound absorption pipes 21; then an audio absorption point corresponding to a first sound absorption pipe 21 is arranged every 10 Hz. Finally, the frequency response curve of the speaker is modulated by the sound absorption bandgap.

[0080] As can be seen from the above content, the sound absorption range of the specified absorption frequency can be adjusted and set according to the high-frequency resonance peak frequency value of the mobile terminal 40 to determine the sound absorption range of the specified absorption frequency. Through the first relationship, the length or diameter of the first sound absorption pipe 21 is set to achieve absorption of sounds of different frequencies to meet the specified absorption frequency range. Through the second relationship, different lengths of the second sound absorption pipe 23, different volumes of the sound absorption cavity 24, and the opening area of ​​the second sound absorption pipe 23 are set to achieve absorption of sounds of different frequencies to meet the specified absorption frequency range.

[0081] In some embodiments, each first sound absorbing pipe 21 is a hose, which is independently arranged inside the mobile terminal 40. Each first sound absorbing pipe 21 is a hose, which can be bent and coiled inside the mobile terminal 40, and all available space inside the mobile terminal 40 is used to set the path of each first sound absorbing pipe 21, disperse the space occupied by the sound absorbing device 20, and utilize the internal space of the mobile terminal 40, thereby saving the limited internal space of the mobile terminal 40.

[0082] In this way, the saved space can be used to place a larger battery, which can increase the battery capacity and the standby time of the mobile terminal 40. The hose should be made of a polymer material with a large acoustic impedance to prevent sound from entering the solid material.

[0083] In some embodiments, each first sound-absorbing pipe 21 may also be made of a rigid tube material. A rigid tube is a hard tube structure made of a material having a certain rigidity. For example, a rigid tube may be made of a material having a certain rigidity, such as metal or plastic. The rigid material is processed into a rigid tube having certain acoustic properties through a special processing technique. The rigid tube may be in a straight tube shape or may be bent according to the internal structure of the mobile terminal.

[0084] In addition, it should be noted that the embodiments disclosed in this disclosure are all acoustic metamaterials, which are artificially designed and prepared on a characteristic physical scale to have an acoustic performance that exceeds that of conventional materials. Acoustic metamaterials generally regulate sound waves by introducing structural design, and the structure is usually a rigid boundary, such as iron, aluminum, or 3D printed materials.

[0085] Among acoustic metamaterials, those with sound absorption function are called sound absorbing metamaterials. The Helmholtz resonator composed of the first sound absorbing pipe 21 in the first embodiment and the second sound absorbing pipe 23 and the sound absorbing cavity 24 in the second embodiment disclosed in the present disclosure both belong to the category of sound absorbing metamaterials.

[0086] In some embodiments of the present disclosure, the sound absorbing device 20 includes an air cavity 22. The air cavity 22 is disposed between the sound leakage hole 11 of the speaker 10 and the sound absorbing component, and is used to couple the sound leakage hole 11 of the speaker 10 with the sound absorbing component. Figure 1 and Figure 2 As shown, the air cavity 22 is provided with a plurality of connection holes, and the sound absorbing component is connected to the air cavity 22 through the connection holes. In this way, the sound from the sound leakage hole 11 enters the air cavity 22 and does not go out to other places, but enters the first sound absorbing pipe 21 or the second sound absorbing pipe 23.

[0087] In one embodiment, one end of the opening of each first sound absorbing pipe 21 or second sound absorbing pipe 23 is detachably connected to the connection hole by plugging and unplugging, so as to realize the detachable connection between the first sound absorbing pipe 21 or second sound absorbing pipe 23 and the air cavity 22. In this way, the connection between the air cavity 22 and the plurality of first sound absorbing pipes 21 or second sound absorbing pipes 23 is more convenient, and installation and disassembly are facilitated.

[0088] In one embodiment, a plurality of connection holes are provided on one or more sides of the air cavity 22. The air cavity 22 is cylindrical in shape, with one end open and then wrapping the sound leakage hole 11, and a plurality of connection holes are provided on the side and the other end. Each surface of the air cavity 22 can be provided with a connection hole, so that the first sound absorbing duct 21 or the second sound absorbing duct 23 has sufficient connection space.

[0089] In one embodiment, the air cavity 22 may also be a cone-shaped column, and the cross section of the end connected to the sound leakage hole 11 is larger than the cross section of the end connected to the first sound absorbing pipe 21 or the second sound absorbing pipe 23. In this way, it is beneficial to gather the sound passing through the sound leakage hole 11, and it is more beneficial to propagate in the direction of the first sound absorbing pipe 21 or the second sound absorbing pipe 23.

[0090] In some embodiments of the present disclosure, the speaker assembly includes a bracket 30, which is connected to the front end of the speaker 10 and forms a front cavity 13 at the sound outlet of the speaker 10. The bracket 30 is made of a plastic material, which is relatively light, affordable, and easy to obtain. The bracket 30 supports and protects the speaker 10. At the same time, the plastic material has a certain buffering effect. If the mobile terminal 40 vibrates, the bracket 30 can ensure the stability of the speaker 10, reduce or avoid shaking of the speaker 10, and ensure the pronunciation effect.

[0091] Another aspect of the present disclosure further provides a mobile terminal, comprising the above-mentioned speaker assembly.

[0092] The mobile terminal 40 can be an electronic device such as a mobile phone, a computer, a telephone watch, etc. For example, the mobile terminal 40 can be a mobile phone, and the mobile terminal 40 in which the above-mentioned speaker assembly is installed. With the development of technology, mobile phones are becoming thinner and lighter, and the display screens are getting larger and larger, especially for mobile phones with full screens. The space available inside the mobile phone is getting smaller and smaller. Users hope that the mobile phone can have dual-channel stereo sound quality. In a full-screen mobile phone, a front cavity needs to be designed inside the mobile phone to guide the sound to the narrow slit of the screen. This design will cause a resonance peak in a certain frequency of sound, which has a bad effect on the sound effect and affects the user experience.

[0093] For example, the mobile terminal 40 can be a phone watch, in which any of the above mobile terminals is installed. With the development of technology, the functions of phone watches are becoming more and more powerful, such as video, phone calls, and music listening. There are more and more components installed inside, and the available space inside is getting smaller and smaller. Users want phone watches to have dual-channel stereo sound quality, so a front cavity needs to be designed inside the phone watch to guide the sound to the narrow slit of the phone watch screen.

[0094] According to some embodiments of the present disclosure, a speaker, also known as a horn, is an electroacoustic device that converts electrical energy into sound energy, and can be used in a mobile terminal or other electronic device to support the mobile terminal or other electronic device to implement an audio output function. The principle of the speaker is that current passes through a coil in a magnetic circuit composed of magnets, generating a driving force in the up and down directions to vibrate the vibrating body, and then vibrates the air to produce sound.

[0095] According to some embodiments of the present disclosure, a mobile phone speaker includes a vibration plate, a protector, an anode, an electromagnetic coil, a metal ring, a magnet and a gasket. Among them, the vibration plate is a vibrating body (plastic film) used to make the air vibrate. It is one of the main parts of the speaker, and the material used more is MCPET material. The protector protects the vibration plate (made of metal). The anode is a metal plate used to make the magnetic lines of force gather around the electromagnetic coil. The electromagnetic coil is a coil that generates a driving force when an electric current passes through it. The metal ring is a metal plate used to make the magnetic lines of force gather around the electromagnetic coil. The magnet is used to emit magnetic lines of force. The gasket is used to suppress the vibration body (air brake) and prevent dust.

[0096] According to some embodiments of the present disclosure, the speaker is generally connected to the circuit board via a contact sheet, and the audio processing circuit on the circuit board is connected to the speaker signal to control the working state of the speaker.

[0097] According to some embodiments of the present disclosure, Figure 6 As shown in the figure, the working process of the audio processing circuit of the mobile phone is as follows: when answering a call, firstly, the 67.707kHz receiving baseband information (RXI-P, RXI-N, RXQ-P, RXQ-N) is demodulated from the RF circuit and sent to the baseband processor for digital narrowband demodulation (GMSK) to separate the control signal and the voice signal; secondly, the voice signal is decrypted, deinterleaved, reassembled and a series of processes are performed, and then channel decoding and voice decoding are performed; finally, a pure digital voice signal is obtained and sent to the multi-mode converter in the voice signal processor for digital / analog (D / A) conversion; after being restored to an analog audio signal, it is amplified by the audio power to drive the earpiece (EAR) to make a sound.

[0098] Working principle of the speaker circuit: The K2 and K3 pins of the voice processor N2200 output the hands-free audio signal, which is amplified by the audio power amplifier N2150, and then output from the B1 and C1 pins of the audio power amplifier N2150. After the high-frequency interference is filtered out by the filters L2158 and L2159, the signal is output to the speaker B2150 after passing through the ESD circuit V2150, which drives the speaker to sound. Figure 7 Among them, C2153 and C2154 are used to filter out high-frequency and low-frequency interference in the power supply, and V2150 is an ESD circuit, that is, an electrostatic protection circuit.

[0099] Circuit boards are classified into hard boards, soft boards, and hard-soft boards according to the hardness of the boards. They are classified into single-sided boards, false double-sided boards, double-sided boards with metalized holes, and multi-layer boards according to the number of circuit layers.

[0100] The current circuit board is mainly composed of the following: Circuit and Pattern: Circuit is used as a tool for conducting between components. In the design, a large copper surface will be designed as the ground and power layer. Circuit and pattern are made at the same time. Dielectric layer: Used to maintain the insulation between circuits and layers, commonly known as substrate. Through hole / via: Through holes can make circuits of two or more layers conduct to each other. Larger through holes are used for component plug-ins. In addition, non-through holes (nPTH) are usually used for surface mounting positioning and fixing screws during assembly. Solder resistant / Solder Mask: Not all copper surfaces need to be tinned with components, so a layer of material (usually epoxy resin) will be printed in the non-tinned areas to prevent the copper surface from tinning and avoid short circuits between non-tinned circuits. According to different processes, it is divided into green oil, red oil, and blue oil.

[0101] Silk screen (Legend / Marking / Silk screen): This is an optional component. Its main function is to mark the names and position frames of each component on the circuit board for easy maintenance and identification after assembly. Surface treatment (Surface Finish): Since the copper surface is easily oxidized in the general environment, it cannot be tinned (poor solderability), so it will be protected on the copper surface that needs to be tinned. The protection methods include HASL, ENIG, Immersion Silver, Immersion TIn, and Organic Solderability Preservative (OSP). Each method has its own advantages and disadvantages, and they are collectively referred to as surface treatment.

[0102] According to some embodiments of the present disclosure, the mobile phone circuit board is mainly composed of a baseband part, a radio frequency part and other parts. Other parts include: CPU, memory, various controllers, including touch screen, Bluetooth, WIFI, sensors, etc. There are also some microphones, receivers, speakers, cameras, interfaces for display screens, etc. Some mobile phone circuit boards include a main PCB board and a sub-PCB board, wherein the main PCB board includes a Wi-Fi module, a camera, a headphone socket, a microUSB interface and various cables. The sub-PCB board is provided with a speaker, a microphone and a cable connecting the two PCB boards.

[0103] According to some embodiments of the present disclosure, Figure 8 About the schematic diagram of mobile phone circuit board. Figure 8In the embodiment of the mobile phone circuit board, the main board 111 is a common multi-layer PCB circuit board. The main board 111 is provided with a baseband module connector 112 and a radio frequency module connector 113. The baseband module connector 112 is usually a pad including multiple pins, which is used to solder the baseband module chip and the power management chip to the main board 111. The radio frequency module connector 113 is also usually a pad including multiple pins, which is used to solder the radio frequency module chip to the main board 111. The baseband module chip and the power management chip are responsible for encoding.

[0104] The RF module chip includes: an RF processor and an RF power amplifier to realize the signal receiving and sending functions. The baseband module chip and the RF module chip realize the baseband signal processing and RF signal processing of the mobile phone respectively, so the baseband module connector 112 and the RF module connector 113 on the mainboard 111 play an important role in realizing the communication function of the mobile phone. The mainboard 111 is also provided with an earphone jack connector 114, a speaker connector 115, an indicator light connector 116, a pickup connector 117 and a power socket connector 118, which correspond to the electrical connection of the earphone jack, the speaker, the indicator light, the pickup and the power socket, and are usually solder pad connectors.

[0105] It is to be understood that in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar thereto. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. The singular forms "a", "" and "the" are also intended to include plural forms, unless the context clearly indicates other meanings.

[0106] It is further understood that the terms "first", "second", etc. are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not indicate a specific order or degree of importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information.

[0107] It will be further understood that the terms “center”, “longitudinal”, “lateral”, “front”, “back”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0108] It can be further understood that, unless otherwise specified, “connection” includes a direct connection without other components between the two, and also includes an indirect connection with other components between the two.

[0109] It is further understood that, although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring the operations to be performed in the specific order shown or in a serial order, or requiring the execution of all the operations shown to obtain the desired results. In certain environments, multitasking and parallel processing may be advantageous.

[0110] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following scope of rights.

[0111] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A speaker assembly, It is characterized in that Applied to a mobile terminal, the speaker assembly includes a sound absorbing device, the sound absorbing device includes a sound absorbing component with a cavity structure, and the cavity of the sound absorbing component is filled with sound absorbing material; The proportional relationship between the size of the sound absorbing component and the filling amount of the sound absorbing material is such that the sound absorbing component absorbs sound at a specified sound absorption frequency; The sound absorbing component includes an air cavity and a plurality of first sound absorbing pipes of different lengths, the designated sound absorbing frequency includes a plurality of sound absorbing frequencies corresponding to the plurality of first sound absorbing pipes, and the sound absorbing frequencies of the plurality of first sound absorbing pipes of different lengths satisfy a model relationship determined by using porous material acoustics based on a finite element method and thermoviscous acoustics; or The sound absorbing component includes an air cavity and a plurality of second sound absorbing pipes with the same or different lengths and a plurality of sound absorbing cavities with the same or different volumes, the sound absorbing cavity is located at an end of the second sound absorbing pipe away from the air cavity, the width of the sound absorbing cavity is greater than the width of the second sound absorbing pipe, each of the second sound absorbing pipes and the corresponding sound absorbing cavity form a Helmholtz resonator, the specified sound absorbing frequency includes a plurality of sound absorbing frequencies corresponding to the plurality of Helmholtz resonators, and the sound absorbing frequencies of the plurality of Helmholtz resonators satisfy a model relationship determined by using porous material acoustics based on a finite element method and thermoviscous acoustics.

2. The loudspeaker assembly according to claim 1, It is characterized in that The sound absorbing component comprises a plurality of first sound absorbing pipes of different lengths; There is a first relationship between the size of each of the first sound absorbing pipes, the amount of sound absorbing material filled in each of the first sound absorbing pipes, and the sound absorbing frequency of each of the first sound absorbing pipes; The first relationship is: Among them, the f p is the sound absorption frequency of each of the first sound absorbing pipes; The n is the high-order resonance order of each of the first sound-absorbing pipes; The L p is the length of each of the first sound-absorbing pipes; Said d is the diameter of each of the first sound absorbing pipes; The v p The sound velocity is determined based on the filling amount of the sound absorbing material filled in each of the first sound absorbing pipes.

3. The loudspeaker assembly according to claim 1, It is characterized in that The sound absorbing component comprises a plurality of second sound absorbing pipes of the same or different lengths and a plurality of sound absorbing cavities of the same or different volumes, and each of the second sound absorbing pipes and the corresponding sound absorbing cavity forms a Helmholtz resonator; There is a second relationship between the size of the Helmholtz resonator, the amount of sound absorbing material filled in the Helmholtz resonator, and the sound absorption frequency of the Helmholtz resonator; The second relationship is: Among them, the f H is the sound absorption frequency of the Helmholtz resonator; The S is the opening area of ​​the second sound absorbing pipe; The V is the volume of the sound absorbing cavity; The L is the length of the second sound absorbing pipe; The v H The velocity of sound is determined based on the filling amount of the sound absorbing material filled in the Helmholtz resonator.

4. The loudspeaker assembly according to any one of claims 1 to 3, It is characterized in that The speaker assembly also includes a front cavity; The designated sound absorption frequency is determined based on a high-frequency resonance peak frequency value of the front cavity, and the high-frequency resonance peak frequency value is determined by simulation based on the shape and size of the front cavity.

5. The loudspeaker assembly according to claim 4, It is characterized in that The designated sound absorption frequency is within a frequency range determined based on the high frequency resonance peak frequency value.

6. The loudspeaker assembly according to claim 2, It is characterized in that The sound absorption frequencies corresponding to the plurality of the first sound absorption pipes constitute one or more sound absorption segments, and each of the sound absorption segments includes the sound absorption frequencies corresponding to one or more of the first sound absorption pipes; Furthermore, each of the sound absorbing segments corresponds to a plurality of the sound absorbing frequencies uniformly arranged in the plurality of the first sound absorbing pipes.

7. A mobile terminal, It is characterized in that Comprising the loudspeaker assembly as claimed in any one of claims 1-6.

8. The mobile terminal according to claim 7, It is characterized in that The sound absorbing device is arranged in the gap between the rear shell and the middle frame in the mobile terminal.

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