CN115643332A - Mobile terminal - Google Patents

Abstract

The present disclosure relates to a mobile terminal, wherein the mobile terminal includes: a housing and a speaker assembly; the speaker assembly includes: the loudspeaker is arranged inside the shell and provided with a sound leakage hole; one end of the sound absorption device is an open end, and the open end is communicated with the sound leakage hole; the other end of the sound absorption device is a closed end; the sound-absorbing device comprises a plurality of sound-absorbing channels which are respectively used for absorbing various sound-absorbing frequencies. The sound absorbing device is used for absorbing sounds with different frequencies, the sound at the rear part of the loudspeaker cannot cause vibration of a rear shell of the mobile terminal, and a user has good user experience.

Description

Mobile terminal

Technical Field

The present disclosure relates to the field of acoustics, and more particularly, to mobile terminals.

Background

Mobile terminals such as mobile phones and computers have become an indispensable part of people's daily life, and with the development of science and technology, the functions of these mobile terminals are more and more increased and more improved. Users are pursuing lightness and thinness of mobile terminals, and pursuing two-channel stereo sound quality, but the internal space of the mobile terminal is limited, and there is no space for arranging the upper cavity. The design of an open cavity is adopted for realizing the three-dimensional tone quality, and when the volume is turned up by a user, the design can cause the rear shell of the mobile terminal to vibrate, so that the use experience of the user is seriously influenced.

Disclosure of Invention

To overcome the problems in the related art, the present disclosure provides a mobile terminal.

According to a first aspect of an embodiment of the present disclosure, there is provided a mobile terminal including: a housing and a speaker assembly; the speaker assembly includes: the loudspeaker is arranged inside the shell and provided with a sound leakage hole; one end of the sound absorption device is an open end, and the open end is communicated with the sound leakage hole; the other end of the sound absorption device is a closed end; the sound-absorbing device comprises a plurality of sound-absorbing channels which are respectively used for absorbing various sound-absorbing frequencies.

In some embodiments, the sound absorbing frequency range absorbed by the plurality of sound absorbing channels includes a natural frequency of the mobile terminal, the natural frequency being a natural frequency of the mobile terminal.

In some embodiments, the sound absorbing device comprises: the air chamber, the air chamber set up in let out the sound hole with inhale between the sound passageway, be used for the coupling let out the sound hole of speaker with inhale the sound passageway.

In some embodiments, the sound absorbing device comprises a plurality of first pipes having different lengths, each of the sound absorbing channels being formed in each of the pipes.

In some embodiments, the first pipes are flexible pipes, and each of the first pipes is independently disposed inside the mobile terminal.

In some embodiments, the sound absorbing device comprises: a plurality of second conduits, each of the second conduits having the same or different length; the sound absorbing cavities are arranged at one ends, far away from the sound leakage holes, of the sound absorbing channels, and the volume of each sound absorbing cavity is the same or different; the number of the sound absorption cavities corresponds to the number of the second pipelines, and the width of the sound absorption cavities is larger than that of the second pipelines.

In some embodiments, the sound absorber is flat, and a plurality of blocking pieces are arranged in the sound absorber and divide the sound absorber to form a plurality of bent sound absorbing channels.

In some embodiments, the sound absorbing means is provided integrally with the barrier.

In some embodiments, the air chamber is made of a rigid tube; the air chamber is provided with a plurality of connecting holes, many inhale the sound passageway and pass through a plurality ofly the connecting hole with the air chamber intercommunication.

In some embodiments, a plurality of the connection holes are provided at one or more sides of the air chamber.

In some embodiments, at least one of the sound absorbing channels is filled with a filler.

In some embodiments, the sound-absorbing device is provided with a switch that closes the sound-absorbing passage when it is detected that the frequency of the sound emitted from the speaker is different from the natural frequency of the mobile terminal.

In some embodiments, the switch is disposed in a gap between a rear case housing and a middle frame of the mobile terminal. The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: when a user uses the mobile terminal provided with the loudspeaker assembly, when the user turns the volume of the mobile terminal to be large, the loudspeaker emits sound, and part of the emitted sound of the loudspeaker enters the sound absorption device through the sound leakage hole at the rear end. Inhale the sound device and constitute by the different pipeline of many lengths, wherein, the one end of each pipeline is sealed, other end opening, and the mode propagation of sound through the sound wave, the entering into many pipelines of sound wave, the sound wave of different frequencies can be absorbed in the management of different lengths, through calculating, sets up the sound device and can absorb the sound wave of specific frequency. Inhale the sound device and replaced the design of opening the chamber, through setting up the pipeline of different length, realize inhaling the sound device and absorb the sound of different frequency, ensured the sound at speaker rear portion can not cause the vibration of mobile terminal's backshell, made the user have good user experience.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

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 disclosure.

Fig. 1 is a schematic diagram of a speaker assembly of a mobile terminal shown in accordance with an exemplary embodiment.

Fig. 2 is a schematic diagram illustrating a speaker assembly of a mobile terminal according to another exemplary embodiment.

Fig. 3 is a diagram illustrating a mobile terminal according to an example embodiment.

Fig. 4 is a flowchart illustrating operation of an audio processing circuit of a handset according to an exemplary embodiment.

Fig. 5 illustrates the operation of a speaker circuit according to an exemplary embodiment.

Fig. 6 is a schematic diagram of a handset circuit board, according to an example embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the disclosure, as detailed in the appended claims.

Fig. 3 is a diagram illustrating a mobile terminal according to an example embodiment. The mobile terminal 40 may be an electronic product with a speaker, such as a mobile phone, a computer, a telephone watch, and the like.

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 an 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 for making the speaker 10 emit sound to the outside of the mobile terminal 40.

As shown in fig. 1 and 2, the speaker assembly includes a speaker 10 and a sound-absorbing device 20. The speaker 10 is used to emit sound. The sound is transmitted through a medium, and can be generated due to the vibration of an object, and the sound is the fluctuation generated by the vibration of a substance, namely sound waves, and can be heard only by the transmission of the medium. The speed of sound waves transmitted in a medium is called sound speed (or sonic speed), the speed of sound in different media is different, and the speed of sound in air is 340m/s. The frequency is the number of times the sound wave of the sound completes the periodic change in the unit time, and is a quantity describing the frequency of the periodic movement, and the frequencies of different sounds are different.

The rear end of the speaker 10 is provided with a sound leakage hole 11. The sound leakage hole 11 is an opening of the rear end of the speaker 10, and when the speaker 10 emits a sound, the sound is emitted forward, and the sound leakage hole 11 is provided at the rear end of the speaker 10 in order to ensure the uniform pressure in the front and rear of the speaker 10.

The sound-absorbing device 20 includes a plurality of sound-absorbing passages for absorbing a plurality of sound-absorbing frequencies, respectively. Sound is propagated through the mode of sound wave, and during the sound wave entered into many and inhales the sound passageway, the sound wave of different sound frequencies is different, and the sound passageway of inhaling of difference can absorb the sound wave of different frequencies.

One end of the sound absorbing means 20 is an open end, which is communicated with the sound discharging hole 11, and the other end of the sound absorbing means 20 is a closed end. The sound emitted from the speaker 10 enters the sound absorbing passage through the sound leakage hole 11 and the open end of the sound absorbing device 20.

In one embodiment, as shown in fig. 1 and 2, the sound absorbing means comprises an air chamber 22. The air chamber 22 is disposed between the sound leakage hole 11 of the speaker 10 and the sound absorption path for coupling the sound leakage hole 11 of the speaker 10 and the sound absorption path. The air chamber 22 may be made of a hard, rigid material. The air chamber 22 may be not too large and thick, and the air chamber 22 is responsible for guiding the sound emitted from the sound leakage hole 11 of the speaker 10 into the sound absorption channel.

In the first embodiment, as shown in fig. 1, the sound-absorbing device 20 further includes a plurality of first ducts 21, and each sound-absorbing passage is formed in each first duct 21. Specifically, the principle of absorption of sound in the first duct 21 is: when sound enters the first pipeline 21 with one sealed end, the sound is reflected back to the terminal of the first pipeline 21, so that the wave crest and the wave trough of the sound wave of the reflected sound and the wave crest and the wave trough of the sound wave of the entered sound correspond to each other and are further offset with each other, and the sound absorption effect of the first pipeline 21 is realized. By means of the difference in length of the first pipe 21, the reflected different sound waves and the incoming sound waves can be correspondingly offset, and the sound with different frequencies can be offset.

In one embodiment, the length of each first conduit 21 is different. Different lengths of the first pipe 21 may be implemented to absorb sound waves of a specific frequency. When the first pipes 21 with different lengths are combined to form a sound absorbing channel, the sound absorbing device 20 can absorb a plurality of sound wave frequencies, so as to form a wide sound absorbing forbidden band, that is, a wide sound absorbing frequency range can be absorbed.

In some embodiments, each of the first pipes 21 is a flexible pipe and is independently disposed inside the mobile terminal 40. In this manner, the first duct 21 may be bent and coiled inside the mobile terminal 40, utilizing all available space inside the mobile terminal 40. The path of each first duct 21 is set, the occupied space of the sound absorption device 20 is dispersed, the internal space of the mobile terminal 40 is fully utilized, the limited internal space of the mobile terminal 40 is saved, the saved space can be used for placing a battery with a larger volume, the capacity of the battery can be increased, the standby time of the mobile terminal 40 is prolonged, and the like.

In some embodiments, each first conduit 21 may also be made of a rigid tube material. The rigid pipe is a hard pipe-mounted structure and is made of a material with certain rigidity. For example, the rigid tube may be made of metal, plastic, etc. having a certain hardness. The rigid material is processed into a rigid pipe with certain acoustic characteristics through a special processing technology. The rigid pipe can be in a straight cylinder shape or can be bent according to the internal structure of the mobile terminal.

Further, the first pipe 21 of the sound absorbing device 20 has one end closed and the other end opened, and sound enters from the opening of the first pipe 21, according to the FP pipe resonance principle, when sound enters a closed cavity, the sound with a specific frequency is eliminated, and the sound with different frequencies can be absorbed by arranging the first pipe 21 with different lengths.

The calculation formula for the length, diameter and absorption frequency of each first pipe 21 is as follows:

where fp is the sound absorption frequency of the first duct 21; n is the order of the higher order resonance of the first pipe 21; l is a radical of an alcohol _p Is the length of the first conduit 21; d is the diameter of the first conduit 21; v. of _p Is the speed of sound in the first pipe 21.

According to the above first formula, the length of the first duct 21 at a certain sound absorption frequency, or the diameter of the first duct 21, can be calculated. Wherein the speed of sound in the first pipe 21 can be measured by an instrument.

The sound absorption frequency of the first duct 21 can be changed by changing the length of the first duct 21, the longer the first duct 21, the less sound absorption frequency can be absorbed; the shorter the first duct 21, the greater the sound absorption frequency that can be absorbed. The sound absorption frequency of the first pipe 21 can also be changed by changing the diameter of the first pipe 21, and the thicker the first pipe 21 is, the lower the sound absorption frequency can be absorbed; the thinner the first duct 21 is, the greater the sound absorption frequency can be absorbed.

Through above-mentioned structural design, inhale sound device 20 and replaced the design in open chamber, consequently through setting up the first pipeline 21 of different length or diameter, realize inhaling the absorption of sound device 20 to different frequency sound waves, ensured that the sound at speaker 10 rear portion can not arouse the vibration of mobile terminal 40's backshell, made the user have good use and experienced.

In some embodiments, a filler may be disposed within the at least one first conduit 21. The filler can be sound absorbing foam, zeolite powder, etc. After the sound absorbing material was filled, according to the Biot porous material equivalent theory, the equivalent sound velocity was reduced. Specifically, after the first duct 21 is filled with the filler, the propagation speed of sound in the first duct 21 may change. In addition, the filler should be made of a polymer material with a large acoustic impedance as much as possible to prevent sound from being incident into the solid material.

When the first duct 21 is filled with the filler, the sound velocity is lowered and the sound absorption frequency is lowered when the first duct 21 has the same length. On the contrary, if the sound absorption frequency is ensured to be constant, the length of the first duct 21 needs to be reduced after the first duct 21 is filled with the filler. Therefore, by adding the filler into the first duct 21, the length of the first duct 21 can be reduced, the volume of the sound-absorbing passage can be reduced, and the sound-absorbing device 20 can be installed in a narrow space inside the mobile terminal 40.

As can be seen from the above, the plurality of first ducts 21 having different lengths can simultaneously absorb sounds having different frequencies, and thus the sound-absorbing passage formed by the plurality of first ducts 21 having different lengths can absorb sound having a wide range of sound-absorbing frequencies.

The sound absorbing frequency range absorbed by the plurality of sound absorbing channels includes a natural frequency of the mobile terminal 40, which is a natural frequency of the mobile terminal 40. The natural frequency is a frequency at which the displacement of the mobile terminal 40 varies according to the sine or cosine law with time when the mobile terminal 40 is freely vibrated, and the magnitude of the natural frequency is related to the mass, shape and material of the mobile terminal 40. When the frequency of the external sound is the same as or similar to the natural frequency of the mobile terminal 40, resonance is easily generated, so that the rear case of the mobile terminal 40 is easily vibrated.

The range of the sound absorption frequency may be set according to the natural frequency of the mobile terminal 40, for example, the natural frequency of the mobile terminal 40 is F ₁ Then the sound absorption frequency range may be F ₁ Plus or minus xHz; wherein xHz may be 500Hz, 1000Hz, etc., and may be set according to the characteristics and usage requirements of the mobile terminal 40. Multiple stripsThe first duct 21 absorbs the frequency of the sound emitted from the rear end of the speaker 10 and corresponding to the natural frequency range of the mobile terminal 40, so that the resonance of the sound to the rear housing of the mobile terminal 40 can be reduced more effectively, and the vibration of the rear housing can be avoided.

It should be noted that, the first formula can perform preliminary calculation and theoretical analysis on the length of the first duct 21, and after a plurality of first ducts 21 with different lengths are connected to the air chamber 22, the frequency points of sound absorption will slightly shift. The air cavity 22 and the first pipe 21 should be modeled using a finite element method in conjunction with thermal visco-acoustic, using Biots porous material acoustic theory.

In a second embodiment, as shown in fig. 2, the sound-absorbing device 20 comprises a plurality of second ducts 23 and a plurality of sound-absorbing cavities 24. The number of sound-absorbing chambers 24 is the same as the number of second ducts 23. The sound-absorbing chamber 24 is provided at an end of the second pipe 23 remote from the sound-discharging hole 11. The diameter width of the sound absorption cavity 24 is larger than that of the second pipeline 23, and a cavity structure is formed. The second pipe 23 forms a helmholtz resonator with the sound-absorbing chamber 24.

In the present embodiment, the lengths of the second pipes 23 may be the same or different. The volumes of the sound-absorbing chambers 24 may be the same or different. Specifically, when the lengths of the second pipes 23 are the same, the volumes of the sound-absorbing chambers 24 may be set to be different (as shown in fig. 2). When the lengths of the second pipes 23 are different, the volumes of the sound-absorbing chambers 24 may be set to be the same. When the lengths of the second pipes are different, the volumes of the sound-absorbing chambers 24 may be set to be different. Thus, the Helmholtz resonator can absorb sound absorption channels with different frequencies.

The design of the Helmholtz resonator is calculated according to the following formula:

wherein, f _H Is the sound absorption frequency of the helmholtz resonator; s is the opening area of the second duct 23 at the air chamber 22; l is the length of the second conduit 23; v is the volume of the sound-absorbing chamber 24; v is _H Is based on HelmThe sound velocity determined by the filling amount of the filler filled in the Hotz resonator.

As can be seen from the above formula, the absorption frequency of the helmholtz resonator is related to the opening area of the second duct 23 at the air chamber 22, the length of the second duct 23, the volume of the sound-absorbing chamber 24, and the sound velocity in the helmholtz resonator.

While the speed of sound in the helmholtz resonator is related to the filling amount of the filler. The filler can be sound absorbing foam, zeolite powder, etc. After the sound absorbing material was filled, according to the Biot porous material equivalent theory, the equivalent sound velocity was reduced.

Specifically, after the helmholtz resonator is filled with the filler, the propagation speed of sound in the helmholtz resonator changes, thereby changing the sound velocity in the helmholtz resonator.

Therefore, the absorption frequency f of the Helmholtz resonator is not changed _H In the case of (3), the opening area of the second duct 23, the length of the second duct 23, and the volume of the sound absorbing chamber 24 are known, and the filling amount of the filler filled in the helmholtz resonator can be obtained by calculating the sound velocity in the helmholtz resonator and by using the relationship between the sound velocity in the helmholtz resonator and the filler (the more the filler is filled, the lower the sound velocity in the helmholtz resonator is).

In addition, the effective sound velocity in the sound absorbing chamber 24 is reduced by filling the helmholtz resonator with the filler, and it can be seen from the above formula that the absorption frequency f of the helmholtz resonator is not changed _H In this case, the volume of the sound absorbing chamber 24 can be reduced, the sound absorbing device 20 can be made smaller, and the sound absorbing device can be mounted inside a mobile terminal 40 having a small internal space, and can be adapted to different mobile terminals 40.

Further, according to the above formula, it can be seen that the sound velocity v in the Helmholtz resonator is not changed _H When the length L and the opening area S of the second duct 23 are small, the volume V of the sound-absorbing chamber 24 is small, and the absorption frequency f of the helmholtz resonator is low _H The larger; conversely, the larger the volume of the sound-absorbing chamber 24, the greater the absorption frequency f of the helmholtz resonator _H The smaller.

Similarly, the speed of sound v in the Helmholtz resonator is not changed _H The volume V and the opening area S of the sound-absorbing chamber 24 are such that the shorter the length L of the second duct 23 is, the lower the absorption frequency f of the helmholtz resonator is _H The larger; conversely, the longer the length L of the second pipe 23, the longer the absorption frequency f of the helmholtz resonator _H The smaller.

In the same way, the sound velocity v in the Helmholtz resonator is not changed _H The larger the opening area S, the greater the absorption frequency f of the helmholtz resonator, the volume V of the sound-absorbing chamber 24, and the length L of the second duct 23 _H The larger; conversely, the smaller the opening area S is, the absorption frequency f of the helmholtz resonator becomes _H The smaller.

In the third embodiment, the sound absorber 20 has a flat structure, and a plurality of stoppers are disposed inside the sound absorber 20, and divide the sound absorber 20 into a plurality of bent sound absorbing passages formed inside the sound absorber 20. By controlling the structure of the blocking members in the sound-absorbing device 20, a labyrinth-like path is formed inside the sound-absorbing device 20 to form sound-absorbing channels with different lengths, so that sounds with different specific frequencies can be absorbed. Wherein the blocking member may be made of a rigid material, and the blocking member is integrally formed with the sound absorbing device 20.

In addition, it should be further noted that the embodiments disclosed in the present disclosure all belong to the acoustic metamaterial, and the acoustic metamaterial is prepared by performing artificial design on characteristic physical dimensions, so that the acoustic metamaterial has an artificial-sequence composite material exceeding the acoustic performance of the conventional material. Acoustic metamaterials typically manipulate acoustic waves by introducing structural designs, typically rigid boundaries, such as iron, aluminum, or 3D printed materials.

In the acoustic metamaterial, the metamaterial having a sound absorbing function is called a sound absorbing metamaterial. The helmholtz resonator composed of the first pipe 21 in the first embodiment, the second pipe 23 and the sound-absorbing cavity 24 in the second embodiment, and the labyrinth-shaped sound-absorbing device 20 in the third embodiment of the present disclosure are all within the category of sound-absorbing meta-materials.

As can be seen from the above, the air chamber 22 is disposed between the sound leakage hole 11 and the sound absorbing passage of the speaker 10, for coupling the sound leakage hole 11 and the sound absorbing passage of the speaker 10. As further shown in fig. 1 and 2, the air chamber 22 is provided with a plurality of connection holes through which a plurality of sound absorbing passages communicate with the air chamber 22. In this way, sound entering the air chamber 22 from the sound leaking hole 11 does not escape to other places, but enters the first duct 21 or the second duct 23.

In one embodiment, one end of the opening of each first pipeline 21 or second pipeline 23 is detachably connected with the connecting hole in a plug-in manner, so that the first pipeline 21 or second pipeline 23 is detachably connected with the air chamber 22. In this way, the connection between the air chamber 22 and the plurality of first ducts 21 or the second ducts 23 is facilitated, facilitating the mounting and dismounting.

In one embodiment, a plurality of connection holes are provided on one or more sides of the air chamber 22. The air chamber 22 is shaped like a column, one end of the air chamber is provided with the sound leaking hole 11, the side surface and the other end of the air chamber are provided with a plurality of connecting holes, and each surface of the air chamber 22 can be provided with the connecting holes, so that the first pipeline 21 or the second pipeline 23 can have a sufficient connecting space.

In one embodiment, the air chamber 22 may be a tapered cylinder, and the cross section of the end connected to the sound discharging hole 11 is larger than the cross section of the end connected to the first duct 21 or the second duct 23. In this way, the sound coming out of the sound vent 11 is collected, and is further propagated toward the first duct 21 or the second duct 23.

In some embodiments, the sound-absorbing device 20 is provided with a switch that closes the sound-absorbing channel when it is detected that the frequency of the sound emitted from the speaker 10 is different from the natural frequency of the mobile terminal 40. After the sound absorbing channel is closed by the switch, the sound absorbing channel does not absorb the sound emitted by the loudspeaker 10 any more under the condition that the sound emitted by the loudspeaker 10 is not changed, so that the sound transmitted to the air or the human ear is increased.

In some embodiments, the switch is disposed in a gap between a rear housing shell and a center frame of the mobile terminal 40. For example, in a sound range of a low frequency, which easily causes the rear case of the mobile terminal 40 to vibrate, the sound absorption frequency ranges of the plurality of first ducts 21 may be set to cover the low frequency range, thereby achieving the problem of avoiding the vibration of the rear case of the mobile terminal 40. Because the natural frequency of different mobile terminals 40 is different, the sound-absorbing device 20 of the present disclosure can be set according to the natural frequency of each mobile terminal 40, so as to more effectively absorb the sound emitted from the sound-leaking holes 11, and prevent the vibration of the rear case of the mobile terminal 40 caused by the excessive sound.

In some disclosed embodiments, the mobile terminal 40 may include a cradle 30, the cradle 30 being connected to the front end of the speaker 10, and forming a front cavity 13 at the sound outlet of the speaker 10. The bracket 30 is made of plastic material, which is light, low in price and convenient to obtain. Support 30 opens the effect of support and protection to speaker 10, and simultaneously, the plastic material has certain cushioning effect, if mobile terminal 40 takes place the vibration, support 30 can guarantee that speaker 10 is stable, reduces or avoids speaker 10 to rock, guarantees the pronunciation effect.

In some disclosed embodiments, the mobile terminal 40 may include two speaker assemblies, respectively disposed at upper and lower portions of the mobile terminal 40. Some mobile terminals 40 may need to be provided with two or more speakers 10, and each speaker 10 is provided with the above speaker assembly, so that the sound emitted from the mobile terminal 40 can have a stereo-side sound quality, and the sound is not too loud due to the vibration of the mobile terminal 40 when the speaker 10 is used.

As shown in fig. 3, the mobile terminal 40 may be an electronic device such as a mobile phone, a computer, a telephone watch, and the like. For example, the mobile terminal 40 may be a cellular phone in which the mobile terminal 40 of the speaker assembly described above is installed. Along with the development of science and technology, the cell-phone is more and more frivolous, and the display screen is bigger and bigger, and the space that can utilize inside the cell-phone is less and less, but people hope that the cell-phone can three-dimensional tone quality when frivolous, so need set up at the rear end of speaker 10 and open the chamber, realize the effect of three-dimensional tone quality, but like this when the user turned up the volume, can arouse the backshell vibrations of cell-phone, brought not good user experience.

As another example, the mobile terminal 40 may be a telephone watch in which any of the above-described mobile terminals is installed. Along with the development of science and technology, the function of phone wrist-watch is more and more powerful, can the video, can talk on, can listen to the music, and the component of its inside setting is also more and more, and the space that inside can utilize is less and less, but people hope that phone wrist-watch can three-dimensional tone quality, so need set up at the rear end of speaker 10 and open the chamber, realize the effect of three-dimensional tone quality, but like this when the user turned up the volume, can arouse phone wrist-watch's backshell vibrations, bring not good user experience.

According to some embodiments of the present disclosure, a speaker, also called a loudspeaker, converts electrical energy into an electroacoustic device of sound energy, which may be used in a mobile terminal or other electronic devices to support the mobile terminal or other electronic devices to implement an audio output function. The principle of the speaker is that a current passes through a coil in a magnetic circuit composed of magnets, and a driving force is generated in the vertical direction to vibrate a vibrating body, so that air is vibrated to generate a sound.

According to some embodiments of the present disclosure, a speaker of a cellular phone includes a vibration plate, a protector, an anode, an electromagnetic coil, a metal ring, a magnet, and a gasket. Among them, the diaphragm is a vibrator (plastic film) for vibrating air, which is one of main parts of a speaker, and MCPET is used as a material in many cases. The protector protects the diaphragm (made of metal). The anode is used to concentrate the magnetic lines of force in the metal plate around the electromagnetic coil. The electromagnetic coil is a coil that generates a driving force when an electric current is passed through it. The metal ring is used for gathering magnetic lines of force on the metal plate around the electromagnetic coil. The magnet is used for emitting magnetic lines. The spacers are used to suppress the vibration body (air brake) and to prevent dust.

In some embodiments according to the present disclosure, the speaker is typically connected to the circuit board through a contact, and an audio processing circuit on the circuit board is in signal connection with the speaker for controlling the operating state of the speaker.

In some embodiments according to the disclosure, as shown in fig. 4, the audio processing circuit of the mobile phone has the following working flow: when a call is answered, firstly, the receiving baseband information (RXI-P, RXI-N, RXQ-P and RXQ-N) of 67.707kHz is demodulated from the radio frequency circuit, and is sent to the inside of a baseband processor for digital narrow band demodulation (GMSK), and a control signal and a voice signal are separated; secondly, carrying out a series of processing such as decryption, de-interleaving, recombination and the like on the voice signal, and then carrying out channel decoding and voice decoding; finally, pure digital voice signals are obtained and sent to a multi-mode converter in the voice signal processor for digital/analog (D/A) conversion; after the analog audio signal is restored, the audio power is amplified to drive an Earphone (EAR) to sound.

Working principle of the loudspeaker circuit: the hands-free audio signals are output from the K2 and K3 pins of the speech processor N2200, amplified by the audio power amplifier N2150, and then output from the B1 and C1 pins of the audio power amplifier N2150. The signal is filtered by filters L2158 and L2159 to remove high frequency interference, and then is output to a loudspeaker B2150 after passing through an ESD circuit V2150 to push the loudspeaker to sound, as shown in FIG. 5. Wherein, C2153 and C2154 are used for filtering high frequency and low frequency interference in the power supply, and V2150 is ESD circuit, i.e. electrostatic protection circuit.

The classification of circuit boards, by board hardness, is: hard board, soft board and soft and hard combined board. The number of the circuit layers is divided into: single-sided boards, pseudo-double-sided boards, metallized hole double-sided boards, and multi-layer boards.

The current circuit board mainly comprises the following circuits and drawings (Pattern): the circuit is used as a tool for conducting elements, and a large copper surface is additionally designed on the design as a grounding and power supply layer. The lines are made simultaneously with the drawing. Dielectric layer (Dielectric): the insulating layer is used to maintain the insulation between the circuit and each layer, and is commonly called as a substrate. Pore (Through hole/via): the via hole can make more than two layers of circuits mutually conduct, the larger via hole is used as a part plug-in, and a non-conducting hole (nPTH) is usually used for surface mounting positioning and screw fixing during assembly. Solder resist ink (sol resist/sol Mask): not all of the copper surfaces will be tinned, so that areas other than the tinned areas will be printed with a layer of substance (usually epoxy) to isolate the tinned copper surfaces from shorting the non-tinned lines. According to different processes, the oil is divided into green oil, red oil and blue oil. Silk screen (Legend/Marking/Silk screen): this is an unnecessary configuration, and the main function is to mark the name and position frame of each component on the circuit board, so as to facilitate maintenance and identification after assembly. Surface treatment (Surface Finish): since the copper surface is easily oxidized in a general environment and tin cannot be applied (poor solderability), the copper surface to be tin-plated is protected. The protection methods include TIn spraying (HASL), gold (ENIG), silver (Immersion Silver), TIn (Immersion TIn), and Organic Solderability Preservative (OSP), which have advantages and disadvantages, and are collectively referred to as surface treatments.

According to some embodiments of the present disclosure, the handset 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, sensor etc.. There are also some microphones, earphones, speakers, cameras, interfaces to display screens, etc. Some mobile phone circuit boards include a main PCB and an auxiliary PCB, wherein the main PCB includes a Wi-Fi module, a camera, an earphone jack, a microUSB interface, and various cables. The auxiliary PCB board is provided with a loudspeaker, a microphone and a flat cable for connecting the two PCB boards.

Fig. 6 is a schematic diagram of a handset circuit board, according to some embodiments of the present disclosure. In fig. 6, the mobile phone circuit board embodiment may include a main board 111, where the main board 111 is a common multilayer PCB circuit board, and a baseband module connector 112 and a radio frequency module connector 113 are disposed on the main board 111, where the baseband module connector 112 is a pad generally including multiple pins for soldering the baseband module chip and the power management chip to the main board 111, and the radio frequency module connector 113 is a pad generally also including multiple pins for soldering the radio frequency module chip to the main board 111. And the baseband module chip and the power management chip are responsible for coding. The radio frequency module chip includes: and the radio frequency processor and the radio frequency power amplifier realize the receiving and transmitting functions of signals. The baseband module chip and the radio frequency module chip respectively realize baseband signal processing and radio frequency signal processing of the mobile phone, so the baseband module connector 112 and the radio frequency module connector 113 on the main board 111 have an important role in realizing the communication function of the mobile phone. Also provided on the main board 111 are an earphone socket connector 114, a speaker connector 115, an indicator light connector 116, a microphone connector 117, and a power supply socket connector 118, which electrically connect the earphone socket, the speaker, the indicator light, the microphone, and the power supply socket, respectively, and are typically pad connectors.

Based on the same conception, the embodiment of the disclosure also provides a mobile terminal device.

It is understood that the mobile terminal device provided by the embodiments of the present disclosure includes a hardware structure and/or a software module for performing the above functions. The disclosed embodiments can be implemented in hardware or a combination of hardware and computer software, in combination with the exemplary elements and algorithm steps disclosed in the disclosed embodiments. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the subject matter of the embodiments of the present disclosure.

It is understood that "a plurality" in this disclosure means two or more, and other words are analogous. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It will be further understood that the terms "first," "second," and the like are used to describe various information and that such information should not be limited by these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the terms "first," "second," etc. are used interchangeably throughout. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.

It will be further understood that the terms "central," "longitudinal," "lateral," "front," "rear," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present embodiment and to simplify the description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation.

It will be further understood that, unless otherwise specified, "connected" includes direct connections between the two without the presence of other elements, as well as indirect connections between the two with the presence of other elements.

It is further to be understood that while operations are depicted in the drawings in a particular order, this is not to be understood as requiring that such operations be performed in the particular order shown or in serial order, or that all illustrated operations be performed, to achieve desirable results. In certain environments, multitasking and parallel processing may be advantageous.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements 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 to be limited only by the scope of the appended claims.

Claims (13)

1. A mobile terminal, characterized in that the mobile terminal comprises: a housing and a speaker assembly; the speaker assembly includes:

the loudspeaker is arranged inside the shell and provided with a sound leakage hole;

the sound absorption device is provided with an opening end at one end, and the opening end is communicated with the sound leakage hole; the other end of the sound absorption device is a closed end;

the sound-absorbing device comprises a plurality of sound-absorbing channels which are respectively used for absorbing various sound-absorbing frequencies.

2. The mobile terminal of claim 1, wherein the sound absorbing frequency range absorbed by the plurality of sound absorbing channels comprises a natural frequency of the mobile terminal, the natural frequency being a natural frequency of the mobile terminal.

3. The mobile terminal of claim 1, wherein the sound absorbing means comprises:

the air chamber, the air chamber set up in let out the sound hole with inhale between the sound passageway, be used for the coupling let out the sound hole of speaker with inhale the sound passageway.

4. A mobile terminal according to claim 3, wherein the sound absorbing means comprises a plurality of first pipes of different lengths, each of the sound absorbing channels being formed in each of the pipes.

5. The mobile terminal of claim 4, wherein the first pipes are flexible pipes, and each of the first pipes is independently disposed inside the mobile terminal.

6. The mobile terminal of claim 3, wherein the sound absorbing device comprises:

a plurality of second conduits, each of the second conduits having the same or different length;

the sound absorption cavities are arranged at one end, far away from the sound leakage hole, of the second pipeline, and the volume of each sound absorption cavity is the same or different;

the number of the sound absorption cavities corresponds to the number of the second pipelines, and the width of the sound absorption cavities is larger than that of the second pipelines.

7. The mobile terminal of claim 3, wherein the sound absorber is flat, and a plurality of blocking members are disposed in the sound absorber, and divide the sound absorber into a plurality of bent sound-absorbing channels.

8. A mobile terminal according to claim 7, wherein the sound absorbing means is provided integrally with the barrier.

9. The mobile terminal according to claim 3, wherein the air chamber is provided with a plurality of connection holes, and the plurality of sound-absorbing channels communicate with the air chamber through the plurality of connection holes.

10. The mobile terminal of claim 9, wherein a plurality of the connection holes are provided at one or more sides of the air cavity.

11. The mobile terminal of claim 1, wherein at least one of the sound absorbing channels is filled with a filler.

12. The mobile terminal according to claim 1, wherein the sound absorbing means is provided with a switch which closes the sound absorbing passage when detecting that the frequency of the sound emitted from the speaker is different from the natural frequency of the mobile terminal.

13. The mobile terminal of claim 12, wherein the switch is disposed in a gap between a rear housing shell and a middle frame of the mobile terminal.

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