TWI857556B - Sound-receiving system, and electronic device - Google Patents

Abstract

A sound-receiving system is provided, including a sound-guiding tube, a microphone, and an acoustic perforated sheet. The sound-guiding tube has an angled path and includes a first end, a second end, and a sound-receiving hole. The sound-receiving hole is arranged at the first end. The microphone is adjacent against the second end. The acoustic perforated sheet is disposed adjacent to the sound-receiving hole and is a distance from the sound-receiving hole. The sound-receiving hole is offset from the microphone. The acoustic perforated sheet reduces and filters off the frequency response of the microphone over a specific frequency range.

Description

Radio systems and electronic devices

The present disclosure relates to a sound receiving system and an electronic device including the same, and in particular to a sound receiving system capable of improving sound quality and an electronic device including the same.

Frequency response refers to the volume of the microphone's response to sounds of different frequencies. The human ear can hear frequencies from 20 Hz to 20 kHz, and the frequency response range of the microphone is also marked in this way. The curve of a microphone with good frequency response is flat, which means that it can respond to nearly equal sound reception at most major frequencies, making it very suitable for recording real ambient sound. But in reality, the frequency response of a microphone is not so flat.

Especially in electronic devices (for example, laptops, tablets, mobile phones, etc.), the microphone's sound receiving channel (sound guide tube) may be quite long due to the configuration requirements of the electronic device. As a result, the frequency response of the microphone will produce irregular amplification in the voice frequency band, which will affect the recording quality, voice recognition, and voice call quality.

Therefore, a sound receiving system that can overcome the existing problems is needed to increase the reliability of the microphone and reduce the cost.

According to some embodiments of the present disclosure, a sound receiving system includes a sound guide tube, a microphone, and an acoustic porous material. The sound guide tube has a curved path, including a first end, a second end, and a sound receiving hole. The sound receiving hole is disposed at the first end. The microphone is close to the second end. The acoustic porous material is disposed adjacent to the sound receiving hole and is disposed at a distance from the sound receiving hole. The sound receiving hole is offset from the microphone. The acoustic porous material reduces and filters the frequency response of the microphone in a specific frequency range.

In one embodiment, the specific frequency range of the microphone is from 100 Hz to 8000 Hz. In one embodiment, the acoustic porous material reduces the frequency response of the specific frequency range of the microphone by between 15 dB and 40 dB. In one embodiment, the smaller the pore size of the acoustic porous material, the lower the frequency response of the specific frequency range of the microphone and the more frequency response is filtered.

In one embodiment, the sound guide tube further includes a first tube portion and a second tube portion. The first end and the sound receiving hole are located in the first tube portion. The second end is located in the second tube portion, and the microphone is close to the second tube portion. A first extension direction of the first tube portion is not parallel to a second extension direction of the second tube portion. In one embodiment, the acoustic porous material is disposed in the first tube portion. In one embodiment, the sound guide tube is L-shaped. In one embodiment, the length of the first tube portion is greater than 2 mm, and the length of the second tube portion is greater than 0.5 mm. In one embodiment, the diameter of the sound receiving hole is greater than 1 mm, and the length of the sound guide tube is between 3 mm and 4 mm, or greater than 4 mm.

In one embodiment, the sound guide tube further includes a first tube portion, a second tube portion, and a third tube portion. The first end and the sound receiving hole are located in the first tube portion. The second end is located in the second tube portion, and the microphone is close to the second tube portion. The third tube portion is located between the first tube portion and the second tube portion. A first extension direction of the first tube portion is not parallel to a third extension direction of the third tube portion. A second extension direction of the second tube portion is not parallel to the third extension direction of the third tube portion. In one embodiment, an acoustic porous material is disposed in the first tube portion. In one embodiment, the sound guide tube is Z-shaped. In one embodiment, the length of the first tube portion is greater than 0.7 mm, the length of the second tube portion is greater than 1 mm, and the length of the third tube portion is greater than 1 mm. In one embodiment, the diameter of the sound receiving hole is greater than 1 mm, and the length of the sound guide tube is between 3 mm and 4 mm, or greater than 4 mm.

According to some embodiments of the present disclosure, an electronic device includes a housing, a glass panel, and a sound receiving system. The sound receiving hole of the sound receiving system is exposed on the glass panel or the housing, and the microphone of the sound receiving system is shielded by the glass panel or the housing.

In order to make the purpose, features, and advantages of the present disclosure more clearly understandable, the following examples are specifically cited and described in detail with the accompanying diagrams. Among them, the configuration of each component in the examples is for illustrative purposes and is not intended to limit the present disclosure. In addition, some duplications of the figure numbers in the examples are for simplifying the description and do not mean the correlation between different embodiments. The directional terms mentioned in the following examples, such as: up, down, left, right, front or back, etc., are only referenced to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and are not used to limit the present disclosure.

Ordinal numbers in this specification and the scope of the patent application, such as "first", "second", "third", etc., have no sequential relationship with each other, and are only used to mark and distinguish two different components with the same name.

Please refer to FIG. 1, which is a schematic diagram of an electronic device 1 according to some embodiments of the present disclosure. The electronic device 1 can be, for example, a notebook computer, a tablet computer, or a mobile phone. As shown in FIG. 1, the electronic device 1 can include a display module 2 and a host module 3.

The display module 2 is connected to the host module 3, and the display module 2 may include a glass panel 10, a housing 20, a lens module 30, and at least one sound receiving system 40. The glass panel 10 may be connected to the housing 20. The lens module 30 may be disposed between the glass panel 10 and the housing 20. In other words, the lens module 30 may be disposed under the glass panel 10.

For example, in the embodiment shown in FIG. 1 , the display module 2 may include two sound receiving systems 40 , and the two sound receiving systems 40 are respectively disposed on the left and right sides of the lens module 30 .

As shown in FIG. 1 , the two sound receiving systems 40 may be respectively separated from the lens module 30 by a certain distance, and the two sound receiving systems 40 may be symmetrically arranged relative to the lens module 30 .

According to some embodiments of the present disclosure, the two sound receiving systems 40 can be separated from the lens module 30 by 25 mm to 50 mm. In other words, the two sound receiving systems 40 can be separated from each other by 50 mm to 100 mm.

For example, according to some embodiments of the present disclosure, the two sound receiving systems 40 can be 33 mm apart from the lens module 30. In other words, the two sound receiving systems 40 can be 66 mm apart from each other.

Please refer to FIG. 1 , the sound receiving system 40 can be disposed between the glass panel 10 and the housing 20 of the display module 2 . In other words, the sound receiving system 40 can be disposed under the glass panel 10 of the display module 2 .

Please refer to FIG. 2, which is a cross-sectional view along the A-A line of the electronic device 1 according to some embodiments of the present disclosure, wherein the glass panel 10, the housing 20, and the sound receiving system 40 are shown. As shown in FIG. 2, when viewed along the X-axis, the sound receiving system 40 can be presented as a Z-type, or the sound receiving system 40 can be substantially presented as a Z-type.

Referring to FIG. 2 , the sound receiving system 40 may include a sound guide tube 41 , an acoustic perforated sheet 42 , and a microphone 43 .

As shown in FIG. 2 , the sound guide tube 41 may have a tubular shape, and may include a first tube portion 411 , a second tube portion 412 , a third tube portion 413 , and a sound receiving hole 414 .

Referring to FIG. 2 , the third tube 413 is disposed between the first tube 411 and the second tube 412 , and is connected to the first tube 411 and the second tube 412 , so that the first tube 411 , the second tube 412 , and the third tube 413 form a path PA for sound wave transmission.

According to some embodiments of the present disclosure, the diameter of the sound receiving hole 414 may be greater than 1 mm. According to some embodiments of the present disclosure, the length of the first tube portion 411 may be greater than 0.7 mm, the length of the second tube portion 412 may be greater than 1 mm, and the length of the third tube portion 413 may be greater than 1 mm. According to some embodiments of the present disclosure, the length of the sound guide tube 41 (the sum of the lengths of the first tube portion 411, the second tube portion 412, and the third tube portion 413) may be between 3 mm and 4 mm, or greater than 4 mm.

For example, according to some embodiments of the present disclosure, the diameter of the sound receiving hole 414 may be 1.39 mm. According to some embodiments of the present disclosure, the length of the first tube portion 411 may be 0.75 mm, the length of the second tube portion 412 may be 5.19 mm, and the length of the third tube portion 413 may be 2.5 mm. For example, according to some embodiments of the present disclosure, the length of the sound guide tube 41 (the sum of the lengths of the first tube portion 411, the second tube portion 412, and the third tube portion 413) may be 8.44 mm.

Referring to FIG. 2 , the first tube portion 411 extends along a first extending direction ED1 , the second tube portion 412 extends along a second extending direction ED2 , and the third tube portion 413 extends along a third extending direction ED3 .

As shown in FIG. 2 , the sound guide tube 41 is quasi-Z-shaped, or the sound guide tube 41 can be substantially Z-shaped. That is, according to some embodiments of the present disclosure, the first extension direction ED1 is not parallel to the third extension direction ED3, and the second extension direction ED2 is not parallel to the third extension direction ED3.

For example, the first extension direction ED1 may be substantially parallel to the Z axis; the second extension direction ED2 may be substantially parallel to the Z axis; and the third extension direction ED3 may be substantially parallel to the Y axis.

Therefore, referring to FIG. 2 , the first extending direction ED1 is substantially perpendicular to the third extending direction ED3 , and the first extending direction ED1 is substantially parallel to the second extending direction ED2 .

Referring to FIG. 2 , the sound guide tube 41 may have a first end 41 a and a second end 41 b opposite to the first end 41 a. The first end 41 a is located at the first tube portion 411 , and the second end 41 b is located at the second tube portion 412 .

The sound receiving hole 414 is located in the first tube portion 411 and is disposed at the first end 41a. The microphone 43 is close to the second tube portion 412 and the second end 41b. In other words, the sound receiving hole 414 is not aligned with the microphone 43. In other words, the sound receiving hole 414 is offset from the microphone 43.

As shown in FIG. 2 , the sound receiving hole 414 can be exposed on the glass panel 10, so as to facilitate the transmission of external sound waves into the sound receiving hole 414. In addition, since the sound guide tube 41 is in a Z-shape, the microphone 43 can be disposed on the lens module 30. Therefore, when the user of the electronic device 1 faces the glass panel 10 and has the need to record sound, the sound receiving hole 414 faces the user, thereby achieving a better sound receiving effect.

Please refer to FIG. 3, which is a schematic diagram of the frequency response of the radio system. As shown in FIG. 3, the peak value of the frequency response of the conventional radio system is quite high, and this peak value is located in the voice frequency range, thereby causing adverse effects on the sound quality. The radio system 40 disclosed herein using the acoustic porous material 42 named item B090 can effectively reduce (flatten) and filter the peak value of the frequency response of the microphone 43, so that the frequency response of the radio system 40 in the voice frequency range is flat, thereby achieving good sound quality.

Since external sound waves can enter the sound guide tube 41 from the sound receiving hole 414, and the sound waves can reach the microphone 43 along the path PA formed by the first tube portion 411, the second tube portion 412, and the third tube portion 413, even if the microphone 43 is shielded by the glass panel 10, the microphone 43 can still achieve a good sound receiving effect.

However, the length of the acoustic wave transmission path PA affects the peak value frequency of the frequency response of the microphone 43. When the acoustic wave transmission path PA is longer, the peak value frequency of the frequency response of the microphone 43 is lower; conversely, when the acoustic wave transmission path PA is shorter, the peak value frequency of the frequency response of the microphone 43 is higher.

The frequency of the peak of the frequency response of the microphone 43 may be located in a specific frequency range. This specific frequency range may be a voice frequency range. For example, the specific frequency range may be between 100 Hz and 8000 Hz, 100 Hz and 9000 Hz, 100 Hz and 10000 Hz, 100 Hz and 15000 Hz, or 1000 Hz and 8000 Hz, 1000 Hz and 9000 Hz, 1000 Hz and 10000 Hz, 1000 Hz and 15000 Hz, etc.

When the frequency of the peak of the frequency response of the microphone 43 is within a specific frequency range, the peak of the frequency response of the microphone 43 within the specific frequency range needs to be reduced (flattened) and filtered to achieve good sound quality.

As shown in FIG. 3 , the frequency response of the conventional sound receiving system has a peak value of about 24 dB at about 8000 Hz. However, the sound receiving system 40 of the disclosed embodiment can reduce the frequency response at about 8000 Hz to about 6 dB. That is, in this embodiment, the sound receiving system 40 can reduce the peak value of the frequency response by about 18 dB.

According to some embodiments of the present disclosure, the acoustic porous material 42 can reduce the frequency response of the microphone 43 in a specific frequency range by 15 dB to 40 dB. For example, the acoustic porous material 42 can reduce the frequency response of the microphone 43 in a specific frequency range by 16 dB, 18 dB, 24 dB, 30 dB, or more than 30 dB.

In addition, the sound receiving system 40 of the disclosed embodiment can also move the peak of the frequency response to a higher frequency. For example, as shown in FIG. 3 , the peak of the frequency response of the sound receiving system 40 of the disclosed embodiment is at about 11,000 Hz. In this way, the peak of the frequency response of the sound receiving system 40 can be moved outside the voice frequency range, thereby achieving good sound quality.

According to some embodiments of the present disclosure, the acoustic porous material 42 can shift the peak of the frequency response to approximately 12,000 Hz, 15,000 Hz, or above 15,000 Hz.

Please refer to FIG. 2 , therefore, the acoustic porous material 42 is disposed in the first tube portion 411. However, it should be noted that the acoustic porous material 42 is disposed at a distance from the sound receiving hole 414 (or the first end 41a), and the acoustic porous material 42 is disposed at a distance from the interface between the first tube portion 411 and the third tube portion 413. In other words, the acoustic porous material 42 is disposed in the middle of the first tube portion 411, not at the end of the first tube portion 411.

The acoustic porous material 42 may be a perforated sheet, a mesh screen, etc. For example, the acoustic porous material 42 may be an acoustic screen with item names such as B090, B160, B260, etc. For example, the acoustic porous material 42 may be a perforated sheet or a mesh screen with a mesh count of 230, 480, or 508, etc. For example, the acoustic porous material 42 may be a perforated sheet or a mesh screen with a mesh opening of 41 microns, 21 microns, or 18 microns.

According to some embodiments of the present disclosure, the acoustic porous material 42 may be a mesh with a product name of B090, a mesh count of 230, and a mesh opening of 41 microns.

According to some embodiments of the present disclosure, when the acoustic porous material 42 has a higher precision (e.g., a higher mesh count or a smaller mesh opening), the acoustic porous material 42 can filter more dust and noise. In other words, the smaller the aperture of the acoustic porous material 42, the lower the frequency response of the microphone 43 in a specific frequency range and the more excessive frequency responses are filtered. Therefore, the acoustic porous material 42 with a higher precision can achieve better sound quality.

According to some embodiments of the present disclosure, when the acoustic porous material 42 has a lower precision (e.g., a lower mesh count or a larger mesh opening), the acoustic porous material 42 can have a reduced impedance and thus require lower power. Therefore, the acoustic porous material 42 with a lower precision can achieve the effect of saving power.

According to some embodiments of the present disclosure, the microphone 43 may include a microelectromechanical systems microphone (MEMS mic) and an application specific integrated circuit (ASIC), so that the microphone 43 can convert the received sound waves into electrical signals for recording.

Please refer to FIG. 2 , the sound guide tube 41 can also be divided into multiple sections. As shown in FIG. 2 , the acoustic porous material 42 can separate the first tube portion 411 into two sections, namely section A and section B; section A is from the sound receiving hole 414 (or the first end 41a) to the acoustic porous material 42, and section B is from the acoustic porous material 42 to the interface between the first tube portion 411 and the third tube portion 413. In other words, the acoustic porous material 42 is disposed at the interface between section A and section B.

According to some embodiments of the present disclosure, the acoustic porous material 42 can be disposed at a distance away from the sound receiving hole 414, and the distance can be in the range of 1/4 to 1/2 of the sum of the length of section A and the length of section B.

In addition, according to some embodiments of the present disclosure, the length of section A may be greater than 0.4 mm, and the length of section B may be greater than 0.3 mm. In other words, the acoustic porous material 42 may be more than 0.4 mm away from the sound receiving hole 414 (or the first end 41 a), and the acoustic porous material 42 may be more than 0.3 mm away from the interface between the first tube portion 411 and the third tube portion 413.

Please continue to refer to Figure 2. Section C is from the interface between the first tube 411 and the third tube 413 to the interface between the second tube 412 and the third tube 413; Section D is from the interface between the second tube 412 and the third tube 413 to the second end 41b (or the interface between the second tube 412 and the microphone 43).

The section D can be further divided into section D1 and section D2. Section D1 is from the interface between the second tube 412 and the third tube 413 to the interface between section D1 and section D2; section D2 is from the interface between section D1 and section D2 to the second end 41b (or the interface between the second tube 412 and the microphone 43).

According to some embodiments of the present disclosure, segment A and segment B may be different components. For example, segment A and segment B may not be integrally formed. According to some embodiments of the present disclosure, segment A may be made of the same material as the bezel of the display module 2. For example, segment A may be made of plastic.

According to some embodiments of the present disclosure, the segment B, the segment C, and the segment D1 may be formed in one piece. According to some embodiments of the present disclosure, the segment B, the segment C, and the segment D1 may be made of the same material as the bezel of the display module 2. For example, the segment B, the segment C, and the segment D1 may be made of plastic. In this way, the stability of the sound receiving system 40 may be increased.

According to some embodiments of the present disclosure, the segment D2 and the segment D1 may be different components. For example, the segment D2 and the segment D1 may not be integrally formed. According to some embodiments of the present disclosure, the segment D2 may be made of a material different from the bezel of the display module 2. For example, the segment D2 may be made of rubber.

According to other embodiments of the present disclosure, segment B, segment C, and segment D1 are not formed in one piece. In one embodiment, segment C is not an independent component; instead, segment C can be a gap formed by other components of the display module 2. In this way, the manufacturing cost of the sound receiving system 40 can be reduced.

Please refer to FIG. 4A and FIG. 4B , which are schematic diagrams of the acoustic porous material 42 of the sound receiving system 40 according to some embodiments of the present disclosure.

As shown in FIG. 4A , the acoustic porous material 42 may have a plurality of holes and a plurality of wires. The wires may be arranged crosswise to form a mesh, and holes may be formed between the wires. In the embodiment of FIG. 4A , the hole may have a square shape, and the hole may have an area a ₀ and a side length w. In the embodiment of FIG. 4A , the wire may have a diameter d.

The acoustic porous material 42 may also be represented by a schematic diagram as shown in Fig. 4B. In the embodiment of Fig. 4B, the hole may have a circular shape; wherein the acoustic porous material 42 may have a thickness t; the hole may have a radius a; and the parameter b may be d+w+d.

Furthermore, if the sound receiving system 40 is analogized to an equivalent circuit model, the acoustic porous material 42 can be analogized to a resistor and an inductor, and the impedance relationship is as follows:

Wherein, Z _A is the acoustic impedance of the acoustic porous material 42, and is the analog resistance of the acoustic porous material 42, is the analog inductance of the acoustic porous material 42.

N is the number of pores of the acoustic porous material 42; μ is the kinematic coefficient for air, and in some embodiments, at a temperature of 20°C and an air pressure of 0.76 mHg, μ may be 1.56×10 ^-5 Ns⁄m ² ; ω is the frequency; ρ ₀ is the air density, and in some embodiments, ρ ₀ may be 1.18 kg⁄m ³ .

Please refer to FIG. 5 , which is a schematic diagram of an equivalent circuit model of a sound receiving system 40 according to some embodiments of the present disclosure. The configuration of each component in the equivalent circuit model of the sound receiving system 40 can be as shown in FIG. 5 .

The external sound wave can be analogized to an equivalent power source P; segment A can be analogized to an equivalent resistor _RA and an equivalent inductor _MA ; the acoustic porous material 42 can be analogized to an equivalent resistor _RM and an equivalent inductor _MM ; segment B can be analogized to an equivalent capacitor _CB ; segment C can be analogized to an equivalent inductor _MC ; segment D can be analogized to an equivalent capacitor _CD and an equivalent inductor _MD .

Therefore, the acoustic porous material 42 can still play the effect of reducing and filtering the peak of the frequency response in the equivalent circuit model.

Please refer to FIG. 6, which is a cross-sectional view along the A-A line of the electronic device 1 according to other embodiments of the present disclosure, wherein the housing 20 and the sound receiving system 40 are shown. In the embodiment of FIG. 6, the sound guide tube 41 may include a first tube portion 411, a second tube portion 412, and a sound receiving hole 414, but the sound guide tube 41 does not have a third tube portion 413.

As shown in FIG. 6 , when viewed along the X-axis, the sound guide tube 41 is L-shaped, or the sound guide tube 41 can be substantially L-shaped. For example, the first extension direction ED1 can be substantially parallel to the Y-axis; the second extension direction ED2 can be substantially parallel to the Z-axis.

That is, as shown in FIG. 6 , the first extending direction ED1 is not parallel to the second extending direction ED2 , and the first extending direction ED1 is substantially perpendicular to the second extending direction ED2 .

Similarly, the sound receiving hole 414 is located in the first tube portion 411, and the sound receiving hole 414 is disposed at the first end 41a. The microphone 43 is close to the second tube portion 412 and the second end 41b. In other words, the sound receiving hole 414 is not aligned with the microphone 43. In other words, the sound receiving hole 414 is offset from the microphone 43.

Please refer to FIG. 6 , the sound receiving hole 414 can be exposed in the housing 20 to facilitate the transmission of external sound waves into the sound receiving hole 414 . In addition, since the sound guide tube 41 is L-shaped, the microphone 43 can be disposed on the lens module 30 .

Since external sound waves can enter the sound guide tube 41 from the sound receiving hole 414, and the sound waves can reach the microphone 43 along the path PA formed by the first tube portion 411 and the second tube portion 412, even if the microphone 43 is shielded by the housing 20, the microphone 43 can still achieve a good sound receiving effect.

Please continue to refer to FIG. 6 , the acoustic porous material 42 is disposed in the first tube portion 411. However, it should be noted that the acoustic porous material 42 is disposed at a distance from the sound receiving hole 414 (or the first end 41a), and the acoustic porous material 42 is disposed at a distance from the interface between the first tube portion 411 and the second tube portion 412. In other words, the acoustic porous material 42 is disposed in the middle of the first tube portion 411, rather than at the end of the first tube portion 411.

According to some embodiments of the present disclosure, the diameter of the sound receiving hole 414 may be greater than 1 mm. According to some embodiments of the present disclosure, the length of the first tube portion 411 may be greater than 2 mm, and the length of the second tube portion 412 may be greater than 0.5 mm. According to some embodiments of the present disclosure, the length of the sound guide tube 41 (the sum of the lengths of the first tube portion 411 and the second tube portion 412) may be between 3 mm and 4 mm, or greater than 4 mm.

For example, according to some embodiments of the present disclosure, the diameter of the sound receiving hole 414 may be 1.39 mm. According to some embodiments of the present disclosure, the length of the first tube portion 411 may be 3.88 mm, and the length of the second tube portion 412 may be 0.60 mm. For example, according to some embodiments of the present disclosure, the length of the sound guide tube 41 (the sum of the lengths of the first tube portion 411 and the second tube portion 412) may be 4.48 mm.

Please refer to FIG. 6 , the sound guide tube 41 can be divided into a plurality of sections. As shown in FIG. 6 , the acoustic porous material 42 can separate the first tube portion 411 into two sections, namely section A and section B; section A is from the sound receiving hole 414 (or the first end 41a) to the acoustic porous material 42, and section B is from the acoustic porous material 42 to the interface between the first tube portion 411 and the second tube portion 412. In other words, the acoustic porous material 42 is disposed at the interface between section A and section B.

According to some embodiments of the present disclosure, the length of section A may be greater than 1 mm, and the length of section B may be greater than 1 mm. In other words, the acoustic porous material 42 may be more than 1 mm away from the sound receiving hole 414 (or the first end 41 a), and the acoustic porous material 42 may be more than 1 mm away from the interface between the first tube portion 411 and the second tube portion 412.

Section B can be further divided into section B1 and section B2. Section B1 is from the acoustic porous material 42 to the interface between section B1 and section B2; section B2 is from the interface between section B1 and section B2 to the interface between the first tube 411 and the second tube 412.

Section C extends from the interface between the first tube portion 411 and the second tube portion 412 to the second end 41 b (or the interface between the second tube portion 412 and the microphone 43 ).

According to some embodiments of the present disclosure, segment A and segment B may be different components. For example, segment A and segment B may not be integrally formed. According to some embodiments of the present disclosure, segment A may be made of the same material as the housing 20. For example, segment A may be made of plastic or metal.

According to some embodiments of the present disclosure, the segment B1 and the segment B2 may not be integrally formed. According to some embodiments of the present disclosure, the segment B1 may be made of the same material as the bezel of the display module 2. For example, the segment B1 may be made of plastic. The segment B2 may be made of rubber.

According to some embodiments of the present disclosure, segment C may be made of rubber. According to some embodiments of the present disclosure, segment B2 and segment C may be integrally formed.

Although the present disclosure mainly describes that the acoustic porous material 42 is disposed at the interface between the section A and the section B, the acoustic porous material 42 can also be disposed at other positions of the sound guide tube 41 .

For example, the acoustic porous material 42 can be arranged in the sound receiving hole 414 (or the first end 41a), in section A, in section B, in section B1, at the interface between section B1 and section B2, in section B2, at the interface between section B and section C, in section C, at the interface between section C and section D, in section D1, at the interface between section D1 and section D2, in section D2, and at the second end 41b.

In general, the sound receiving system of the disclosed embodiment can reduce (flatten) and filter the peak value of the frequency response of the microphone, thereby achieving good sound quality. The disclosed embodiment can solve the problems of recording quality, voice recognition, and voice call quality of the sound receiving system with a longer sound guide tube. Moreover, the sound receiving system of the disclosed embodiment can reduce the manufacturing cost and increase the stability of the device.

Although the embodiments and advantages of the present disclosure have been disclosed above, it should be understood that any person with ordinary knowledge in the relevant technical field can make changes, substitutions and modifications without departing from the spirit and scope of the present disclosure. In addition, the scope of protection of the present disclosure is not limited to the processes, machines, manufacturing, material compositions, devices, methods and steps in the specific embodiments described in the specification. Any person with ordinary knowledge in the relevant technical field can understand the current or future developed processes, machines, manufacturing, material compositions, devices, methods and steps from the content of the present disclosure, as long as they can implement substantially the same functions or obtain substantially the same results in the embodiments described here, they can be used according to the present disclosure. Therefore, the protection scope of the present disclosure includes the above-mentioned processes, machines, manufacturing, material compositions, devices, methods and steps. In addition, each patent application constitutes a separate embodiment, and the protection scope of the present disclosure also includes the combination of each patent application and embodiment.

1: electronic device 2: display module 3: host module 10: glass panel 20: housing 30: lens module 40: sound receiving system 41: sound guide tube 41a: first end 41b: second end 42: acoustic porous material 43: microphone 411: first tube 412: second tube 413: third tube 414: sound receiving hole A: segment B: segment B1: segment B2: segment C: segment D: segment D1: segment D2: segment ED1: first extension direction ED2: second extension direction ED3: third extension direction N: number of apertures P: equivalent power PA: path X: X axis Y: Y axis Z: Z axis _CB : equivalent capacitance C _D : equivalent capacitance _MA : equivalent inductance M _C : equivalent inductance M _D : equivalent inductance M _M :Equivalent inductance R _A :Equivalent resistance R _M :Equivalent resistance a:Radius a ₀ :Area b:Parameter d:Diameter t:Thickness w:Side length Z _AAcoustic impedance μ:Air viscosity ρ ₀ :Air density ω:Frequency

The present disclosure can be clearly understood by the detailed description and accompanying drawings that follow. It is emphasized that, in accordance with standard practice in the industry, the various features are not drawn to scale and are used for illustrative purposes only. In fact, in order to enable clear description, the sizes of various features may be arbitrarily enlarged or reduced. FIG. 1 is a schematic diagram of an electronic device according to some embodiments of the present disclosure. FIG. 2 is a cross-sectional view along the A-A line of the electronic device according to some embodiments of the present disclosure, showing a glass panel, a housing, and a radio system. FIG. 3 is a schematic diagram of the frequency response of the radio system. FIG. 4A is a schematic diagram of an acoustic porous material of the radio system according to some embodiments of the present disclosure. FIG. 4B is a schematic diagram of an acoustic porous material of a sound receiving system according to some embodiments of the present disclosure. FIG. 5 is a schematic diagram of an equivalent circuit model of a sound receiving system according to some embodiments of the present disclosure. FIG. 6 is a cross-sectional view along the A-A line of an electronic device according to other embodiments of the present disclosure, showing a housing and a sound receiving system.

40: Radio system

41: Sound guide tube

41a: First end

41b: Second end

42: Acoustic porous materials

43: Microphone

411: First Pipeline

412: Second pipe section

413: Third Department

414: Sound receiving hole

A: Section

B: Section

C: Section

D: Section

D1: Section

D2: Section

ED1: First extension direction

ED2: Second extension direction

ED3: The third extension direction

PA: Path

X: X axis

Y:Y axis

Z:Z axis

Claims (6)

A sound receiving system includes: a sound guide tube having a curved path, including: a first end; a second end, opposite to the first end; a sound receiving hole, arranged at the first end; a first tube portion, wherein the first end and the sound receiving hole are located at the first tube portion; a second tube portion, wherein the second end is located at the second tube portion; and a third tube portion, located between the first tube portion and the second tube portion; a microphone, close to the second end and close to the second tube portion; and an acoustic porous material, arranged adjacent to the sound receiving hole and arranged at a distance from the sound receiving hole. a distance; wherein the sound receiving hole is offset from the microphone; wherein the acoustic porous material reduces and filters the frequency response of a specific frequency range of the microphone; wherein a first extension direction of the first tube portion is not parallel to a third extension direction of the third tube portion; wherein a second extension direction of the second tube portion is not parallel to the third extension direction of the third tube portion; wherein the length of the first tube portion is greater than 0.7 mm, the length of the second tube portion is greater than 1 mm, and the length of the third tube portion is greater than 1 mm, wherein the sound guide tube presents a Z-type shape. As in claim 1, the sound receiving system, wherein the acoustic porous material is disposed in the first tube portion. For example, in the sound receiving system of claim 1, the diameter of the sound receiving hole is greater than 1 mm, and the length of the sound guide tube is between 3 mm and 4 mm, or greater than 4 mm. As in claim 1, the radio system, in the equivalent circuit model of the radio system, the acoustic porous material is analogous to an equivalent resistor and an equivalent inductor. As claimed in claim 1, in the equivalent circuit model of the sound receiving system, the acoustic porous material is expressed as the following correlation formula:

Wherein Z _A is the acoustic impedance of the acoustic porous material; wherein a is the radius of the hole of the acoustic porous material; wherein b is d+w+d, wherein d is the diameter of the wire of the acoustic porous material, wherein w is the side length of the wire of the acoustic porous material; wherein t is the thickness of the acoustic porous material; wherein N is the number of pores of the acoustic porous material; wherein μ is the air viscosity; wherein ω is the frequency; wherein ρ ₀ is the air density; wherein

is an analog resistor of the acoustic porous material, and

is an analog inductor of the acoustic porous material. An electronic device comprises: a housing; a glass panel connected to the housing; and a sound receiving system as claimed in claim 1; wherein the sound receiving hole of the sound receiving system is exposed on the glass panel or the housing, and the microphone of the sound receiving system is shielded by the glass panel or the housing.

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