KR20170057584A - Microphone filter - Google Patents

Microphone filter Download PDF

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Publication number
KR20170057584A
KR20170057584A KR1020150160883A KR20150160883A KR20170057584A KR 20170057584 A KR20170057584 A KR 20170057584A KR 1020150160883 A KR1020150160883 A KR 1020150160883A KR 20150160883 A KR20150160883 A KR 20150160883A KR 20170057584 A KR20170057584 A KR 20170057584A
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KR
South Korea
Prior art keywords
sound wave
microphone
sound
inlet
filter
Prior art date
Application number
KR1020150160883A
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Korean (ko)
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KR101744672B1 (en
Inventor
이종배
박구택
김태영
Original Assignee
크레신 주식회사
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Priority to KR1020150160883A priority Critical patent/KR101744672B1/en
Publication of KR20170057584A publication Critical patent/KR20170057584A/en
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Publication of KR101744672B1 publication Critical patent/KR101744672B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H04R1/083—Special constructions of mouthpieces
    • H04R1/086—Protective screens, e.g. all weather or wind screens
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2410/00—Microphones
    • H04R2410/07—Mechanical or electrical reduction of wind noise generated by wind passing a microphone

Abstract

The present invention provides a microphone filter comprising: a cover unit surrounding a diaphragm of a microphone to which sound waves are introduced from the outside to be coupled thereto; and a sound wave filter unit extended towards one side from the cover unit, and having a sound wave introduction hole. The sound wave introduction hole includes: a sound wave inlet through which the sound waves are introduced from the outside; and a sound wave outlet through which the sound waves introduced through the sound wave inlet are discharged to the diaphragm of the microphone. The sound wave introduction hole formed in the sound wave filter unit filters a predetermined frequency band of the sound waves provided from the sound wave inlet to provide the filtered sound waves to the diaphragm through the sound wave outlet. According to the present invention, the sound waves can be amplified through the sound wave introduction hole formed in the sound wave filter unit, and the predetermined frequency band is also filtered through length and diameter adjustment of the sound wave introduction hole, to block noise. Moreover, since the frequency band of the sound waves to be filtered is changed in accordance with the structure or shape of the sound wave introduction hole formed in the sound wave filter unit, the predetermined frequency band of the desired sound waves can be acquired.

Description

Microphone filter {MICROPHONE FILTER}

The present invention relates to a microphone filter.

2. Description of the Related Art [0002] With the rapid development of telecommunications, microphones that convert voice to electrical signals are becoming smaller and smaller.

Recently, semiconductor processing technology using micromachining has been used as a technique for integrating a micro device. This technology, called MEMS, can be used to fabricate micromachined micrometer sensors, actuators and electromechanical structures using micromachining techniques, particularly those applied in semiconductor processing, integrated circuit technology.

MEMS microphones manufactured using such a micromachining technique can be miniaturized, high-performance, multi-functionalized, and integrated by ultra-fine processing. In addition, there is an advantage that stability and reliability can be improved. MEMS microphones are mainly divided into a piezo-type and a condenser type. Because of the excellent frequency response characteristics of the negative band including voice, the capacitor type is mainly used for the MEMS microphone.

However, since the MEMS microphones are commonly used (close to the mouth, close to the mouth), they are used to pick up ambient noise or noise.

To solve these problems, Japanese Patent Application Laid-Open No. 2004-175461 (hereinafter referred to as "prior art") and the like are known. The prior art suggests a technique for suppressing noise of a microphone installed in an electronic device and a camera.

Specifically, the prior art is a technique for suppressing vibration or noise transmitted through a sound generated inside an electronic device such as a video camera or a case of an electronic device by mounting a microphone or a microphone cover through an elastic member.

However, although the prior art can suppress the vibration and noise generated in the interior by using the material characteristic of the elastic member, since there is not a configuration for filtering out the noise generated from the outside, There is a problem that it is difficult to block.

In addition, the prior art has a problem in that the structure for preventing the inflow of moisture or foreign matter from the outside to the microphone is insufficient and the durability of the microphone is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a microwave oven capable of suppressing noise and noise introduced from the outside into a microphone or filtering a specific frequency band of an incoming sound wave, And a microphone filter capable of protecting the microphone from moisture or foreign matter.

According to an aspect of the present invention, there is provided a microphone filter comprising: a cover portion surrounding a diaphragm of a microphone through which a sound wave flows from the outside; And a sound wave filter unit extending from the cover unit to one side and having a sound wave inflow hole through which a sound wave flows from the outside and a sound wave outflow hole through which sound waves flowing through the sound wave inlets flow out to the diaphragm of the microphone; And a sound wave inflow hole formed in the sound wave filter unit filters a specific frequency band of the sound wave flowing into the sound wave inlet and flows out to the diaphragm through the sound wave outlet.

At least one sound wave inflow hole is formed in the sound wave filter unit.

The sound wave inflow hole may be formed in a cylindrical shape having a diameter of the sound wave inlet and a diameter of the sound wave outlet.

The sound wave inflow hole is formed in a conical shape in which the diameter of the sound wave inlet is different from the diameter of the sound wave outlet.

The sound wave inflow hole is provided between the sound wave inlet and the sound wave outlet so that at least one of the sound wave inlet and the sound wave outlet has a diameter larger than the diameter of the sound wave outlet.

In addition, the sound wave inflow hole may have a structure in which at least one bending section bent at a predetermined angle is formed between the sound wave inlet and the sound wave outlet.

The present invention has the following effects.

First, not only can a sound wave be amplified through a sound wave inlet hole formed in a sound wave filter unit, but also noise and noise can be blocked by filtering a specific frequency band by controlling the length or diameter of the sound wave inlet hole.

Second, since a frequency band of a sound wave to be filtered is changed according to the structure or shape of the sound wave inflow hole formed in the sound wave filter unit, a specific frequency band of a desired sound wave can be obtained.

Thirdly, it is possible to prevent the external impact or the inflow of moisture or foreign matter, which may flow into the microphone from the outside, through the sound wave filter unit, thereby improving the durability of the microphone.

1 is an exploded cross-sectional view illustrating components of a microphone filter and a microphone according to a first embodiment of the present invention.
2 is a cross-sectional view illustrating a microphone filter coupled to a microphone according to a first embodiment of the present invention.
3 is a cross-sectional view showing another embodiment of a microphone filter coupled to a microphone according to the first embodiment of the present invention.
4 is a cross-sectional view of a microphone filter coupled to a microphone according to a second embodiment of the present invention.
5 is a cross-sectional view of a microphone filter coupled to a microphone according to a third embodiment of the present invention.
6 is a cross-sectional view illustrating a microphone filter coupled to a microphone according to a fourth embodiment of the present invention.
7 is a graph showing the frequency band and decibel (dB) of a sound wave according to the length and diameter of a sound wave inflow hole of the microphone filter of the present invention.

Hereinafter, the detailed description of related arts will be omitted (for example, a specific frequency band of a sound wave to be filtered according to the structure of the sound wave inflow hole) if it is determined that the gist of the present invention may be unnecessarily blurred. In addition, numerals used in the description of the present invention are merely an identifier for distinguishing one component from another.

In addition, the terms used in the specification and claims should not be construed in a dictionary meaning, and the inventor may, on the principle that the inventor can properly define the concept of a term in order to explain its invention in the best way, And should be construed in light of the meanings and concepts consistent with the technical idea of the present invention.

Therefore, the embodiments shown in the present specification and the drawings are only exemplary embodiments of the present invention, and not all of the technical ideas of the present invention are presented. Therefore, various equivalents It should be understood that water and variations may exist.

The preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

< In the first embodiment  Description of the microphone filter according to the present invention>

1 is a cross-sectional view illustrating components of a microphone filter and a microphone according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a microphone filter coupled to a microphone according to a first embodiment of the present invention, FIG. 3 is a cross-sectional view showing another embodiment of a microphone filter coupled to a microphone according to the first embodiment of the present invention. FIG. 7 is a perspective view of a sound wave flowing into a diaphragm according to the length and diameter of a sound wave inflow hole of the microphone filter of the present invention (DB) &lt; / RTI &gt;

A microphone filter 100 according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 3. The microphone filter 100 includes a cover 110 and an acoustic filter 120.

The cover 110 is configured to surround a microphone 10 to which a sound wave or an ultrasonic wave flows from the outside and to be coupled to the microphone 110 to protect the microphone 10 from an external impact or prevent moisture or foreign matter from entering the cover 110 . More specifically, the diaphragm 11 or the diaphragm of the structure of the microphone 10 is enclosed. Here, the microphone 10 refers to a device that receives a sound wave or an ultrasonic wave to generate an electric signal according to the vibration. The vibration film 11, which is one of the structures of the microphone 10, receives the vibration of a sound wave, .

The sound wave filter unit 120 is configured to filter a specific frequency band of a sound wave entering the diaphragm 11 of the microphone 10 and is formed extending from the cover unit 110 to cover the cover unit 110 As shown in FIG. The cover 110 and the sound wave filter unit 120 may be formed as gaskets in the form of a cap to be sandwiched between pipes or objects so as to prevent gas, oil, sound and the like from leaking out. Is preferably made of a material such as silicone or rubber excellent in elasticity, water resistance, and insulation.

1, the sound wave filter unit 120 includes a sound wave inflow hole 121 for providing a sound wave inflow and outflow path so that a sound wave from the outside flows into the diaphragm 11 of the microphone 10 And is formed to pass through from the upper side to the lower side.

The sound wave inflow hole 121 has a sound wave inlet 122 through which a sound wave flows from the outside and a sound wave inlet 123 through which a sound wave introduced through the sound wave inlet 122 flows out to the diaphragm 11 of the microphone 10. [ . Therefore, the external sound wave flows into the sound wave inlet 122 and then flows out through the sound wave outlet 123 to be transmitted to the diaphragm 11.

At least one sound wave inlet hole 121 may be formed in the sound wave filter unit 120. It is preferable that the sound wave inlet 122 and the sound wave outlet 123 are formed in the same number as the number of the sound wave inlet holes 121 so as to correspond to the sound wave inlet holes 121, respectively. For example, as shown in FIG. 2, if two sound wave inlet holes 121 are formed in the sound wave filter unit 120, two sound wave inlet holes 121 formed in the sound wave inlet hole 121 may be formed, Sound waves are introduced into the diaphragm 11 through the two sound wave outlets 122, respectively.

More specifically, the reason why the sound wave inflow hole 121 is formed in the sound wave filter unit 120 will be described. The sound wave inflow hole 121 is formed by filtering a specific frequency band of a sound wave flowing from the outside into the sound wave inlet 122 And the frequency band of the filtered sound wave can flow out to the diaphragm 11 through the sound wave outlet 123.

The frequency band of the filtered sound wave is formed in the sound wave filter unit 120 so that the length of the sound wave inflow hole 121 that provides the inflow and outflow path of the sound wave introduced from the outside or the length of the sound wave inflow hole 121 (Or circumference) of the diameter of the inlet 122 and the diameter of the sound outlet 123 or the circumference thereof. That is, the length of the sound wave inlet hole 121 formed in the sound wave filter unit 120 or the diameter of the sound wave inlet 122 and the sound wave outlet 123 can be adjusted to select a specific frequency band of the sound wave to be filtered.

The sound wave inlet 121 formed in the sound wave filter unit 120 will be described with reference to the graph of FIG. , dB) is extremely noticeable. That is, the sound wave inflow hole 121 is formed in the sound wave filter unit 120, and the sound wave introduced into the sound wave inflow hole 121 from the outside through the sound wave inflow hole 121 ) Is not formed, and it is understood that the sound wave is amplified because the decibel (dB) is generally higher than that of the sound wave which is directly introduced into the diaphragm 11 from the outside. As the length of the sound wave inflow hole 121 is increased, the frequency band level of the sound wave moves in the arrow direction shown in FIG. 7 have. Accordingly, the present invention can selectively filter a specific frequency band of a sound wave flowing into the diaphragm 11 through the length of the sound wave inlet hole 121 or the diameter of the sound wave inlet 122 and the sound wave outlet 123 .

1 and 2, the sound wave inflow hole 121 according to the first embodiment of the present invention has a cylindrical shape in which the diameter of the sound wave inlet 122 and the diameter of the sound wave outlet 123 are the same And may be formed in a cylindrical shape inclined at a predetermined angle, as shown in Fig. That is, not only the length of the sound wave inflow hole 121 or the diameter of the sound wave inlet 122 and the sound wave outlet 123 but also the external sound wave is absorbed by the sound wave inflow hole 121 The frequency band of a sound wave flowing into the diaphragm 11 is changed. Therefore, it is possible to selectively filter a specific frequency band of a sound wave by changing the shape or structure of the sound wave inlet hole 121. Accordingly, since a specific frequency band of a sound wave can be selectively obtained through the sound wave inlet hole 121, a frequency band of a desired sound wave can be obtained by filtering a frequency band of undesired sound waves (for example, ambient noise or noise) can do.

< In the second embodiment  Description of the microphone filter according to the present invention>

4 is a cross-sectional view of a microphone filter coupled to a microphone according to a second embodiment of the present invention.

Referring to FIG. 4, a microphone filter 200 according to a second embodiment of the present invention includes a cover unit 210 and an acoustic filter unit 220.

The second embodiment of the present invention will be described mainly on the difference from the first embodiment, and a duplicate description will be simplified or omitted.

The cover 210 of the microphone filter 200 according to the second embodiment of the present invention has the same structure as the cover 110 of the microphone filter 100 according to the first embodiment of the present invention. The description of the constituent features is the same as that described above, and thus a detailed description thereof will be omitted.

The sound wave filter unit 220 is configured to filter a specific frequency band of sound waves flowing into the diaphragm 11 of the microphone 10. The sound wave filter unit 220 includes a cover unit 210, And a sound wave inflow hole 221 is formed through the sound wave inflow hole 221 to provide a sound wave inflow and outflow path from the outside so that the sound wave flows into the vibration film 11 of the microphone 10. [ The sound wave inlet hole 221 has a sound wave inlet 223 through which a sound wave introduced through the sound wave inlet 222 and a sound wave inlet 222 through which the sound wave flows from the outside flows out to the diaphragm 11 of the microphone 10, .

In addition, at least one sound wave inlet hole 221 may be formed in the sound wave filter unit 220, like the sound wave filter unit 120 according to the first embodiment. It is preferable that the sound wave inlet 222 and the sound wave outlet 223 are formed in the same number as the number of the sound wave inlet holes 221 so as to correspond to the sound wave inlet holes 221.

4, the sound wave inlet hole 221 may be formed in a conical shape or a truncated cone shape in which the diameter of the sound wave inlet port 222 and the diameter of the sound wave outlet port 223 are different from each other. That is, the sound wave inflow hole 221 may be formed in a shape of a collimated light formed by expanding the diameter of the sound wave outlet 223 downward from the diameter of the sound wave inlet 223.

Since the sound wave inlet port 222 and the sound wave outlet port 223 are formed to have different diameters, sound waves entering from the outside are resonated in the sound wave inlet hole 221, so that the sound wave is amplified, It can be different. Therefore, the frequency band different from the frequency band of the sound wave filtered through the first embodiment of the present invention can be filtered by the structure or shape of the sound wave inlet hole 221 formed in the sound wave filter unit 220. In addition, since the sound wave inlet hole 221 according to the second embodiment of the present invention adjusts the diameter of the sound wave inlet port 222 and the sound wave outlet port 223 to change the frequency band of a sound wave filtered according to the structure or shape, The frequency band of the sound wave can be selectively obtained.

4, the sound wave inflow hole 221 may be formed to have an upper light-narrowing shape that is formed by expanding the diameter of the sound wave inflow opening 222 to the diameter of the sound wave outflow opening 223 as the diameter of the sound wave inflow opening 222 goes upward, The shape of the inlet hole 221 is not limited to the shape shown in Fig.

< In the third embodiment  Description of the microphone filter according to the present invention>

5 is a cross-sectional view of a microphone filter coupled to a microphone according to a third embodiment of the present invention.

A microphone filter 300 according to a third embodiment of the present invention will be described with reference to FIG. 5. The microphone filter 300 includes a cover unit 310 and an acoustic filter unit 320.

The third embodiment of the present invention will be described mainly on the differences from the first embodiment described above, and redundant description will be simplified or omitted.

The structure of the cover part 310 of the microphone filter 300 according to the third embodiment of the present invention is similar to that of the cover part 110 of the microphone filter 100 according to the first embodiment of the present invention The description of the constituent features is the same as that described above, and thus a detailed description thereof will be omitted.

The sound wave filter unit 320 is configured to filter a specific frequency band of a sound wave flowing into the diaphragm 11 of the microphone 10. The sound wave filter unit 320 includes a cover unit 310, For this purpose, a sound wave inflow hole 321 is formed to provide a sound wave inflow and outflow path so that a sound wave can flow into the diaphragm 11 of the microphone 10 from the outside. The sound wave inflow hole 321 includes a sound wave inflow port 322 through which a sound wave flows from the outside and a sound wave inflow port 323 through which the sound wave introduced through the sound wave inflow port 322 flows out to the diaphragm 11 of the microphone 10, .

In addition, at least one sound wave inflow hole 321 may be formed in the sound wave filter unit 320, like the sound wave filter unit 120 according to the first embodiment described above. It is preferable that the sound wave inlet 322 and the sound wave outlet 323 are formed in the same number as the sound wave inlet holes 321 so as to correspond to the sound wave inlet holes 321.

The sound wave inflow hole 321 is formed between the sound wave inflow port 322 and the sound wave outflow port 323 as shown in Fig. 5 and has an enlarged diameter larger than the diameter of the sound wave inflow port 322 and the sound wave outflow port 323. [ (Dashed line display area) 324 is formed on the sound wave inlet hole 321. It is preferable that at least one or more of the extension sections 324 are formed in the sound wave inlet hole 321. [

Due to the structure of the sound wave inflow hole 321, the sound wave introduced from the outside through the sound wave inflow port 322 passes through the expansion section 324 having the expanded diameter as compared with the sound wave inflow port 322, Wave outlet 323 having a reduced diameter as compared with the sound wave outlet 323. Through this process, a sound wave resonance phenomenon occurs in the sound wave inflow hole 321, so that the sound wave that flows into the vibration film 11 of the microphone 10 can be amplified or the frequency band can be changed. Therefore, the sound wave filter unit 320 according to the third embodiment of the present invention is configured such that the frequency of the sound wave filtered through the first and second embodiments of the present invention by the structure or the shape of the sound wave inflow hole 321 Band and another frequency band can be filtered.

Since the sound wave inflow hole 321 has a frequency band of a sound wave filtered according to a structure or a shape which is varied by adjusting the diameters of the sound wave inlet 322, the sound wave outlet 323, and the expansion section 324 to be different from each other It is possible to selectively obtain the frequency band of the sound wave according to need.

In addition, the sound wave inflow hole 321 is not limited to the structure shown in FIG. 5 but may be provided in various structures. The sound wave inflow hole 321 may be formed by variously adjusting the number or shape of the expansion section 324, The band can be arbitrarily selected.

< In the fourth embodiment  Description of the microphone filter according to the present invention>

6 is a cross-sectional view illustrating a microphone filter coupled to a microphone according to a fourth embodiment of the present invention.

Referring to FIG. 6, a microphone filter 400 according to a fourth embodiment of the present invention includes a cover 410 and an acoustic filter 420.

The fourth embodiment of the present invention will be described mainly on the differences from the first embodiment, and a duplicate description will be simplified or omitted.

The structure of the cover 410 of the microphone filter 400 according to the fourth embodiment of the present invention is similar to that of the cover 110 of the microphone filter 100 according to the first embodiment of the present invention The description of the constituent features is the same as that described above, and thus a detailed description thereof will be omitted.

The sound wave filter unit 420 is configured to filter a specific frequency band of sound waves flowing into the diaphragm 11 of the microphone 10. The sound wave filter unit 420 is extended from the cover unit 410 and integrally formed with the cover unit 410, For this purpose, a sound wave inflow hole 421 is formed to provide a sound wave inflow and outflow path so that a sound wave can flow into the vibration film 11 of the microphone 10 from the outside. The sound wave inflow hole 321 has a sound wave inlet 422 through which a sound wave flows from the outside and a sound wave inlet 422 through which a sound wave flowing through the sound wave inlet 422 flows out to the diaphragm 11 of the microphone 10, .

In addition, at least one sound wave inflow hole 421 may be formed in the sound wave filter unit 420, like the sound wave filter unit 120 according to the first embodiment described above. It is preferable that the sound wave inlet 422 and the sound wave outlet 423 are formed in the same number as the number of the sound wave inlet holes 421 so as to correspond to the sound wave inlet holes 421.

6, the sound wave inflow hole 421 may be provided with a bending section 425 bent at a predetermined angle between the sound wave inlet 422 and the sound wave outlet 423, At least one bending section 425 is preferably formed in the sound wave inflow hole 421.

Due to the structure of the sound wave inflow hole 421, the sound wave introduced from the outside through the sound wave inflow port 422 passes through the bending section 425 and changes its traveling direction at least once and flows out through the sound wave outflow port 423 do. Through this process, a sound wave resonance phenomenon occurs in the inlet hole 421, so that the sound waves flowing into the diaphragm 11 of the microphone 10 can be amplified or the frequency band can be changed. Accordingly, the sound wave filter unit 420 according to the fourth embodiment of the present invention can be configured to have the same structure or shape as the sound wave inflow hole 421 through the first, second, and third embodiments of the present invention The frequency band of the sound wave to be filtered and another frequency band can be filtered.

In addition, since the sound wave inflow hole 421 has a frequency band of a sound wave to be filtered depending on the structure or shape, which is varied by adjusting the angle of the bending section 425 or the number of the formed sound waves, Can be obtained.

In addition, since the direction in which the sound waves are introduced does not proceed in only one direction through the bending section 425 formed in the sound wave inflow hole 421, it is possible to prevent the inflow of moisture or foreign matter, which may flow into the microphone 10 from outside, The present invention can contribute not only to the filtering of the frequency band of the sound wave but also to enhance the durability of the microphone 10. [

As described above, since the frequency band of a sound wave to be filtered is changed according to the structure or shape of the sound wave inlet holes 121, 221, 321, and 421 into which external sound waves are introduced, The frequency band of the sound wave to be filtered can be adjusted. Therefore, the microphone filter of the present invention can be used for various purposes by selectively acquiring a specific frequency band of sound waves suitable for the purpose of use of the microphone 10 or the surrounding environment.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. And the scope of the present invention should be understood as the scope of the following claims and their equivalents.

Description of the Related Art [0002]
100, 200, 300, 400: microphone filter
110, 210, 310, 410:
120, 220, 320, 420: a sound wave filter unit
121, 221, 321, 421: Sound wave inlet hole
122, 222, 322, 422: sound wave inlet
123, 223, 323, 423: Sound wave outlet
324: Extension section
425: Bending section
10: microphone
11: diaphragm

Claims (6)

A cover part enclosing a diaphragm of a microphone into which a sound wave flows from the outside; And
A sound wave filter unit extending from the cover unit to one side and having a sound wave inflow hole through which a sound wave flows from the outside and a sound wave inflow hole through which sound waves flowing through the sound wave inlets flow out into the diaphragm of the microphone are formed; &Lt; / RTI &
Wherein the sound wave inflow hole formed in the sound wave filter unit filters a specific frequency band of the sound wave flowing into the sound wave inflow port and flows out to the vibration film through the sound wave outlet port
Microphone filter.
The method according to claim 1,
And at least one sound wave inflow hole is formed in the sound wave filter unit
Microphone filter.
3. The method of claim 2,
Wherein the sound wave inflow hole is formed in a cylindrical shape having a diameter of the sound wave inlet and a diameter of the sound wave outlet.
Microphone filter.
3. The method of claim 2,
Wherein the sound wave inflow hole is provided in a conical shape in which the diameter of the sound wave inlet port and the diameter of the sound wave outlet port are different from each other
Microphone filter.
3. The method of claim 2,
Wherein the sound wave inflow hole is provided between the sound wave inlet and the sound wave outlet so that at least one expansion section having a diameter larger than the diameter of the sound wave inlet and the sound wave outlet is provided
Microphone filter.
3. The method of claim 2,
Wherein the sound wave inflow hole is provided with at least one bending section bent at a predetermined angle between the sound wave inlet and the sound wave outlet.
Microphone filter.
KR1020150160883A 2015-11-17 2015-11-17 Microphone filter KR101744672B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102321711B1 (en) * 2020-05-14 2021-11-04 (주)에스엠인스트루먼트 acoustic camera with horn type structure for receiving acoustic wave
US11917348B2 (en) 2021-06-01 2024-02-27 Xmems Taiwan Co., Ltd. Covering structure, sound producing package and related manufacturing method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102321711B1 (en) * 2020-05-14 2021-11-04 (주)에스엠인스트루먼트 acoustic camera with horn type structure for receiving acoustic wave
WO2021230583A1 (en) * 2020-05-14 2021-11-18 (주)에스엠인스트루먼트 Acoustic camera having expandable acoustic wave receiving structure
US11917348B2 (en) 2021-06-01 2024-02-27 Xmems Taiwan Co., Ltd. Covering structure, sound producing package and related manufacturing method

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