TWM625261U - Sound cavity module of feedback active noise cancellation - Google Patents

Sound cavity module of feedback active noise cancellation Download PDF

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TWM625261U
TWM625261U TW110214918U TW110214918U TWM625261U TW M625261 U TWM625261 U TW M625261U TW 110214918 U TW110214918 U TW 110214918U TW 110214918 U TW110214918 U TW 110214918U TW M625261 U TWM625261 U TW M625261U
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sound
microphone
acoustic cavity
active noise
noise reduction
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TW110214918U
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溫吉正
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溫吉正
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Abstract

The invention discloses a sound cavity module of feedback active noise cancellation, which comprises a speaker, a case and a mic. The speaker comprises a sound emitting surface. An inner side of the case and the sound emitting surface constitute a front sound cavity. The mic is disposed outside the front sound cavity. With that, the sound tuning problem is eliminated after assembling with the headphone's case.

Description

反饋主動降噪式的聲腔模組Feedback active noise reduction acoustic cavity module

本創作係關於一種反饋(Feedback)主動降噪式(Active Noise Cancellation, ANC)的聲腔模組，特別是關於入耳式耳機的技術領域，用於簡化耳機校正複雜及尺寸過大的問題。This creation is about a Feedback Active Noise Cancellation (ANC) acoustic cavity module, especially in the technical field of in-ear headphones, which is used to simplify the problems of complicated headphone calibration and excessive size.

反饋式主動式降噪耳機的技術已日趨成熟，琳瑯滿目的各式降噪耳機陳列在消費者的眼前，降噪耳機從以往的有線耳罩式耳機演進成無線藍芽耳機，其體積是越做越小，但目前卻遇到了技術上的瓶頸，由於各種耳機結構都會需要有聲腔的共鳴才能提供較好的音質，但是由於硬體設備的技術受限，現今的降噪藍芽耳機在外形結構上，會有一部分結構凸出使用者的耳朵，容易造成一不小心就脫落的疑慮。The technology of feedback active noise-cancelling headphones has become more and more mature, and a dazzling variety of noise-cancelling headphones are displayed in front of consumers. Noise-cancelling headphones have evolved from the previous wired earmuffs to wireless Bluetooth headphones. The smaller it is, but it has encountered a technical bottleneck at present. Since various headphone structures will require the resonance of the acoustic cavity to provide better sound quality, but due to the technical limitations of the hardware equipment, the current noise-cancelling Bluetooth headphones are in the shape structure. On the top, there will be a part of the structure protruding from the user's ear, which is easy to cause the doubt that it will fall off accidentally.

也由於降噪藍芽耳機算是精密的電子產品，禁不起從人耳的高度掉落至地面的衝擊，主要的原因在於降噪藍芽耳機在組裝上，必須透過喇叭模組與耳機外殼間的相互連接，使兩者間區隔出聲腔來提供良好的音質及達到降噪的功效，降噪藍芽耳機才會在外型上一直無法突破到更小的體積。Also because the noise-cancelling bluetooth earphones are sophisticated electronic products, they cannot withstand the impact of falling from the height of the human ear to the ground. The main reason is that the noise-cancelling bluetooth earphones must be assembled through the interaction between the speaker module and the earphone shell. Connection, so that the sound cavity is separated between the two to provide good sound quality and achieve the effect of noise reduction, and the noise-cancelling Bluetooth headset has been unable to break through to a smaller size in appearance.

參考圖1，現有技術的反饋主動降噪式的耳機10。其包含一外殼上蓋11、一外殼下蓋12、一喇叭13及一麥克風14。該喇叭13包括一出音面15。該外殼上蓋11包括一調音孔16。該外殼下蓋12包括一穿線孔17及一洩音孔18。一般而言，現有的模式為在該喇叭13及該麥克風14組裝完成後，再將該外殼上蓋11及該外殼下蓋12進行組裝在該喇叭13及該麥克風14外部。於此同時，該外殼上蓋11與該出音面15形成一前聲腔19(包含該麥克風14)；該外殼下蓋12與該喇叭13相對該出音面15的另一側形成一後聲腔20。需注意的是，此處的該外殼上蓋11及該外殼下蓋12及等同上述的耳機外殼。因此對於音質影響甚鉅的聲腔在此時才能確認進而進行調整該前聲腔19、該後聲腔20、該調音孔16及該洩音孔18已達到預定的音質才能從一出音口21將聲音送至人耳。同時，因為該麥克風14(全指向性麥克風)設置於該喇叭13的該出音面15，根據不同的耳機外殼產生的不同音場也會導致調音的困難。且如同上述，因為耳機外殼的組裝可能導致調音程序出現障礙；不同的耳機外殼也可能需要進行不同的調音。Referring to FIG. 1 , a feedback active noise cancellation type earphone 10 of the prior art is shown. It includes a casing upper cover 11 , a casing lower cover 12 , a speaker 13 and a microphone 14 . The speaker 13 includes a sound outlet surface 15 . The casing upper cover 11 includes a tuning hole 16 . The casing lower cover 12 includes a wire hole 17 and a sound leakage hole 18 . Generally speaking, in the existing mode, after the speaker 13 and the microphone 14 are assembled, the casing upper cover 11 and the casing lower cover 12 are assembled outside the speaker 13 and the microphone 14 . At the same time, the casing upper cover 11 and the sound exit surface 15 form a front acoustic cavity 19 (including the microphone 14 ); the casing lower cover 12 and the speaker 13 form a rear acoustic cavity 20 on the other side of the casing relative to the sound exit surface 15 . . It should be noted that the upper casing 11 and the lower casing 12 here are equivalent to the earphone casings described above. Therefore, the sound cavity that has a great influence on the sound quality can only be confirmed and adjusted at this time. The front sound cavity 19, the rear sound cavity 20, the tuning hole 16 and the sound leakage hole 18 have reached the predetermined sound quality. to the human ear. At the same time, because the microphone 14 (omnidirectional microphone) is disposed on the sound exit surface 15 of the speaker 13, different sound fields generated by different earphone shells will also cause difficulty in tuning. And as mentioned above, because the assembly of the earphone casing may cause obstacles to the tuning procedure; different earphone casings may also require different tuning.

故，有必要提出一種反饋主動降噪式的聲腔模組，其不需要與耳機外殼連接，就可以完整的呈現出良好的聲音品質之標準化聲腔模組以解決上述習知技術的問題。Therefore, it is necessary to propose a feedback active noise reduction type acoustic cavity module, which can completely present a standardized acoustic cavity module with good sound quality without being connected to the earphone shell, so as to solve the above-mentioned problems of the conventional technology.

為解決上述習知技術的問題，本創作提供一種反饋主動降噪式的聲腔模組。現有技術中喇叭以及麥克風均設置於前聲腔內，且前聲腔是由喇叭的出音面與耳機外殼構成，在與耳機外殼組裝後才能進行調音，存在許多技術困難。本創作其通過將麥克風移至前聲腔外部，並使喇叭與殼體形成該前聲腔，省去後續配合耳機外殼還需要調音的技術問題。In order to solve the above-mentioned problems of the conventional technology, the present invention provides a feedback active noise reduction acoustic cavity module. In the prior art, both the horn and the microphone are arranged in the front sound cavity, and the front sound cavity is composed of the sound outlet surface of the horn and the earphone shell. Tuning can only be performed after being assembled with the earphone shell, and there are many technical difficulties. In this creation, the microphone is moved to the outside of the front sound cavity, and the speaker and the shell form the front sound cavity, which eliminates the technical problem of matching the earphone shell and the need for tuning later.

為達上述目的，本創作提供一種反饋主動降噪式的聲腔模組，其包含一喇叭、一殼體及一麥克風。該喇叭包含一出音面；該殼體的內部與該出音面形成一前聲腔；該麥克風設置於該前聲腔的外部。In order to achieve the above purpose, the present invention provides a feedback active noise reduction acoustic cavity module, which includes a speaker, a casing and a microphone. The speaker includes a sound exit surface; the interior of the casing and the sound exit surface form a front acoustic cavity; the microphone is arranged outside the front acoustic cavity.

在一較佳實施例中，該麥克風還包括一收音口，該收音口的方向與該出音面的方向垂直。In a preferred embodiment, the microphone further includes a sound-receiving port, and the direction of the sound-receiving port is perpendicular to the direction of the sound outlet surface.

在一較佳實施例中，該殼體還包含一縫隙用於調整聲音品質。In a preferred embodiment, the casing further includes a slit for adjusting the sound quality.

在一較佳實施例中，該殼體在該前聲腔中相對該出音面的另一側具有一出音嘴；且該出音嘴截面積小於等於該出音面。In a preferred embodiment, the casing has a sound mouth on the other side of the front acoustic cavity opposite to the sound outlet surface; and the cross-sectional area of the sound mouth is less than or equal to the sound outlet surface.

在一較佳實施例中，該麥克風為全指向性麥克風。In a preferred embodiment, the microphone is an omnidirectional microphone.

在一較佳實施例中，所述反饋主動降噪式的聲腔模組還包括一麥克風支撐結構用於連接該麥克風及該殼體。In a preferred embodiment, the feedback active noise reduction acoustic cavity module further includes a microphone support structure for connecting the microphone and the casing.

在一較佳實施例中，該麥克風設置於該喇叭的一側邊，該出音面垂直該側邊。In a preferred embodiment, the microphone is disposed on one side of the speaker, and the sound output surface is perpendicular to the side.

在一較佳實施例中，所述反饋主動降噪式的聲腔模組還包括一麥克風訊號連接線，其設置於該前聲腔外部。In a preferred embodiment, the feedback active noise reduction type acoustic cavity module further includes a microphone signal connection line disposed outside the front acoustic cavity.

在一較佳實施例中，該麥克風以及該出音嘴投影至該出音面的一平面上時不重疊。In a preferred embodiment, the microphone and the sound outlet do not overlap when projected onto a plane of the sound outlet surface.

在一較佳實施例中，該殼體還包括一穿線孔及一洩音孔。In a preferred embodiment, the casing further includes a wire hole and a sound leakage hole.

相較習知技術，本創作其通過將麥克風移至前聲腔外部，並使喇叭與殼體形成該前聲腔，省去後續配合耳機外殼還需要調音的技術問題。Compared with the prior art, in the present invention, the microphone is moved outside the front sound cavity, and the speaker and the shell form the front sound cavity, thereby eliminating the technical problem of subsequent tuning of the earphone shell.

以下各實施例的說明是參考圖式，用以說明本創作可用以實施的特定實施例。本創作所提到的方向用語，例如「上」、「下」、「前」、「後」、「左」、「右」、「內」、「外」、「側面」等，僅是參考圖式的方向。因此，使用的方向用語是用以說明及理解本創作，而非用以限制本創作。The following descriptions of the embodiments refer to the drawings to illustrate specific embodiments in which the present invention may be implemented. The direction terms mentioned in this creation, such as "up", "down", "front", "rear", "left", "right", "inside", "outside", "sideways", etc., are for reference only the direction of the schema. Therefore, the directional terms used are for explaining and understanding this creation, not for limiting this creation.

請參考圖2，繪示本創作的反饋主動降噪式的聲腔模組100的第一示意圖。該反饋主動降噪式的聲腔模組100包含一喇叭13、一殼體22及一麥克風14。該喇叭13包含一出音面15；該殼體22的內部與該出音面15形成一前聲腔19；該麥克風14設置於該前聲腔19的外部。詳細地，該殼體22是配合該喇叭13的特性進行設計，因此，該殼體2不像現有技術中在耳機結構上需多一隔離板的結構及尺寸，可進一步縮小體積。Please refer to FIG. 2 , which shows a first schematic diagram of the acoustic cavity module 100 of the feedback active noise reduction type of the present invention. The feedback active noise reduction acoustic cavity module 100 includes a speaker 13 , a casing 22 and a microphone 14 . The speaker 13 includes a sound exit surface 15 ; the interior of the casing 22 and the sound exit surface 15 form a front acoustic cavity 19 ; the microphone 14 is disposed outside the front acoustic cavity 19 . Specifically, the casing 22 is designed according to the characteristics of the speaker 13 , therefore, the casing 2 does not require an additional structure and size of an isolation plate in the earphone structure in the prior art, and can further reduce the volume.

視需求，還可以在該殼體22上設置一縫隙23對聲音的品質進行調整，且該縫隙23中更具有一音孔，用以進行洩音。然而，由於本創作的反饋主動降噪式的聲腔模組100是屬於包含前聲腔19的立體結構，在某些特定狀況下，甚至不需要縫隙26便可以達成音質的調教。需特別注意的是，現有技術的調音孔甚至會設置不只一個，除了增加耳機外殼生產的難度甚至可能會降低耳機外殼的結構強度。According to requirements, a slot 23 can be set on the casing 22 to adjust the sound quality, and the slot 23 has a sound hole for sound leakage. However, since the acoustic cavity module 100 of the feedback active noise reduction type of the present invention belongs to a three-dimensional structure including the front acoustic cavity 19 , in some specific situations, the adjustment of the sound quality can be achieved even without the gap 26 . It should be particularly noted that there may even be more than one tuning hole in the prior art, which may even reduce the structural strength of the earphone case in addition to increasing the difficulty of producing the earphone case.

較佳地，該殼體22在該前聲腔19中相對該出音面15的另一側具有一出音嘴26；且該出音嘴截26面積小於等於該出音面15。舉例而言，該出音嘴26會是一個截頭錐狀，且經過此收斂聲音的形狀可以讓音波更加的集中Preferably, the casing 22 has a sound outlet 26 on the other side of the front acoustic cavity 19 opposite the sound outlet surface 15 ; For example, the mouthpiece 26 will be a frustoconical shape, and the shape of the converging sound can make the sound waves more concentrated

；同時，因為該麥克風14設置在該前聲腔19的外部，可以減少前聲腔19的設計以及麥克風14的設置之間的交互影響。At the same time, because the microphone 14 is arranged outside the front acoustic cavity 19, the interaction between the design of the front acoustic cavity 19 and the arrangement of the microphone 14 can be reduced.

在本示意圖中，該麥克風14還包括一收音口25，該收音口25的方向與該出音面15的方向垂直。此處需要特別說明的是，現有技術中，因為將麥克風設置在前聲腔的內部，為了避免因為前聲腔內部聲音反射，通常會將麥克風的收音口與出音面平行設置，然而，即便是使用全指向性麥克風，仍然會因為其設置在前聲腔內部而無可避免的受到影響。然而，因為本創作中，因為已經在該前聲腔19的調整後，聲波已經很大程度集中，再搭配將該收音口25的方向垂直於該出音面15(即該出音嘴26)，可以大幅度改善音效體驗。In this schematic diagram, the microphone 14 further includes a sound-receiving port 25 , and the direction of the sound-receiving port 25 is perpendicular to the direction of the sound outlet surface 15 . It should be noted here that, in the prior art, since the microphone is arranged inside the front sound cavity, in order to avoid sound reflection in the front sound cavity, the sound-receiving port of the microphone is usually arranged in parallel with the sound outlet surface. Omnidirectional microphones are still inevitably affected by their placement inside the front acoustic cavity. However, in this creation, because the sound waves have been concentrated to a large extent after the adjustment of the front acoustic cavity 19, and the direction of the sound receiving port 25 is perpendicular to the sound outlet surface 15 (that is, the sound outlet 26), Can greatly improve the sound experience.

較佳地，本示意圖中，所述反饋主動降噪式的聲腔模組100還包括一麥克風支撐結構24用於連接該麥克風14及該殼體22。原則上，為了避免該麥克風14與該喇叭13交互影響彼此，使該麥克風14以及該出音嘴26不重疊的設置，亦即，將該麥克風14以及該出音嘴26投影至該出音面15的一平面上時不重疊。Preferably, in this schematic diagram, the feedback active noise reduction acoustic cavity module 100 further includes a microphone support structure 24 for connecting the microphone 14 and the housing 22 . In principle, in order to prevent the microphone 14 and the speaker 13 from interacting and affecting each other, the microphone 14 and the sound mouth 26 are not overlapped, that is, the microphone 14 and the sound mouth 26 are projected onto the sound outlet surface. 15 do not overlap on a plane.

綜上所述，可以理解因為該麥克風14不在該前聲腔19內部，因此一麥克風訊號連接線(未圖示，也可以說就是麥克風支撐結構24)也不需要設置於該聲腔19內部，而可以設置在該前聲腔19外部。至少會有兩個優點：1.沒有該麥克風訊號連接線在該前聲腔19內部造成的該前聲腔設計的困難；2. 因為沒有該麥克風訊號連接線而可以使該反饋主動降噪式的聲腔模組100的體積變得更小。To sum up, it can be understood that because the microphone 14 is not inside the front acoustic cavity 19, a microphone signal connection line (not shown, it can also be said to be the microphone support structure 24) does not need to be disposed inside the acoustic cavity 19, but can be It is arranged outside the front acoustic cavity 19 . There will be at least two advantages: 1. There is no difficulty in the design of the front acoustic cavity caused by the microphone signal connection line inside the front acoustic cavity 19; 2. Because there is no microphone signal connection line, the feedback active noise reduction type acoustic cavity The volume of the module 100 becomes smaller.

進一步，因為該前聲腔19不需要搭配耳機外殼進行調整而在該喇叭13的底部另外保留一個如同現有技術的後聲腔，而可以直接將一穿線孔17及一洩音孔18設置在該殼體22上並且直接連接該喇叭13而不需要保留任何的空間作為調音用途，進而可以使該反饋主動降噪式的聲腔模組100的體積變得更小。Further, because the front acoustic cavity 19 does not need to be adjusted with the earphone shell, and a rear acoustic cavity as in the prior art is reserved at the bottom of the speaker 13, a wire hole 17 and a sound leakage hole 18 can be directly disposed in the shell 22 and directly connected to the speaker 13 without reserving any space for tuning purposes, thereby making the volume of the feedback active noise reduction acoustic cavity module 100 smaller.

請參考圖3，繪示本創作的反饋主動降噪式的聲腔模組200的第二示意圖，本示意圖與第一示意圖的差異在於將該麥克風14設置於該喇叭13的一側邊。詳細地，該出音面15(該出音嘴26)垂直該側邊。此方案可以加大該出音嘴26的面積且更完整的避免該喇叭13產生的音波影響該麥克風14的收音以及該喇叭14影響該喇叭13發出的音波。且可以省略該麥克風支撐結構24，進一步簡化結構。Please refer to FIG. 3 , which shows a second schematic diagram of the feedback active noise reduction acoustic cavity module 200 of the present invention. The difference between this schematic diagram and the first schematic diagram is that the microphone 14 is disposed on one side of the speaker 13 . In detail, the sound exit surface 15 (the sound exit mouth 26 ) is perpendicular to the side. This solution can increase the area of the sound outlet 26 and more completely prevent the sound waves generated by the speaker 13 from affecting the sound collection of the microphone 14 and the speaker 14 affecting the sound waves emitted by the speaker 13 . And the microphone support structure 24 can be omitted to further simplify the structure.

需要特別說明的是，本創作的反饋主動降噪式的聲腔模組能夠與任意的耳機外殼進行組裝而不需要再次進行調音，能夠節省後續組裝時間即減低難度。It should be noted that the feedback active noise reduction acoustic cavity module of this creation can be assembled with any earphone shell without re-tuning, which can save subsequent assembly time and reduce difficulty.

以上僅是本創作的較佳實施方式，應當指出，對於熟悉本技術領域的技術人員，在不脫離本創作原理的前提下，還做出若干改進和潤飾，這些改進和潤飾也應視為本創作的保護範圍。The above are only the preferred embodiments of the present creation. It should be pointed out that for those skilled in the art, without departing from the principles of the present creation, several improvements and modifications can also be made, and these improvements and modifications should also be regarded as the present invention. Creation protection.

10:反饋主動降噪式的耳機 11:外殼上蓋 12:外殼下蓋 13:喇叭 14:麥克風 15:出音面 16:調音孔 17:穿線孔 18:洩音孔 19:前聲腔 20:後聲腔 21:出音口 22:殼體 23:隙縫 24:麥克風支撐結構 25:收音口 26:出音嘴 100、200:反饋主動降噪式的聲腔模組 10: Feedback Active Noise Cancelling Headphones 11: Shell cover 12: Shell lower cover 13: Horn 14: Microphone 15: The sound surface 16: Tuning hole 17: Threading holes 18: vent hole 19: Front vocal cavity 20: back vocal 21: sound outlet 22: Shell 23: Gap 24: Microphone support structure 25: radio port 26: Voice mouth 100, 200: Feedback active noise reduction acoustic cavity module

圖1，繪示圖1，現有技術的反饋主動降噪式的耳機；及 圖2，繪示本創作的反饋主動降噪式的聲腔模組的第一示意圖；及 圖3，繪示本創作的反饋主動降噪式的聲腔模組的第二示意圖。 FIG. 1 shows FIG. 1 , a feedback active noise reduction type earphone in the prior art; and FIG. 2 is a first schematic diagram of the feedback active noise reduction acoustic cavity module of the present invention; and FIG. 3 is a second schematic diagram of the feedback active noise reduction acoustic cavity module of the present invention.

13:喇叭 13: Horn

14:麥克風 14: Microphone

15:出音面 15: The sound surface

16:調音孔 16: Tuning hole

17:穿線孔 17: Threading holes

18:洩音孔 18: vent hole

19:前聲腔 19: Front vocal cavity

20:後聲腔 20: back vocal

21:出音口 21: sound outlet

22:殼體 22: Shell

23:隙縫 23: Gap

24:麥克風支撐結構 24: Microphone support structure

25:收音口 25: radio port

26:出音嘴 26: Voice mouth

100:反饋主動降噪式的聲腔模組 100: Feedback active noise reduction acoustic cavity module

Claims (10)

一種反饋主動降噪式的聲腔模組，其包括： 一喇叭，包含一出音面； 一殼體，且該殼體的內部與該出音面形成一前聲腔； 一麥克風，設置於該前聲腔的外部。 A feedback active noise reduction acoustic cavity module, comprising: a speaker, including a sound surface; a shell, and the interior of the shell and the sound exit surface form a front sound cavity; A microphone is arranged outside the front acoustic cavity. 如請求項1的所述反饋主動降噪式的聲腔模組，其中該麥克風還包括一收音口，該收音口的方向與該出音面的方向垂直。The feedback active noise reduction acoustic cavity module of claim 1, wherein the microphone further comprises a sound receiving port, and the direction of the sound receiving port is perpendicular to the direction of the sound exit surface. 如請求項1的所述反饋主動降噪式的聲腔模組，其中該殼體還包含一縫隙用於調整聲音品質。The feedback active noise reduction acoustic cavity module of claim 1, wherein the casing further includes a gap for adjusting sound quality. 如請求項1的所述反饋主動降噪式的聲腔模組，其中該殼體在該前聲腔中相對該出音面的另一側具有一出音嘴；且該出音嘴截面積小於等於該出音面。The feedback active noise reduction type acoustic cavity module of claim 1, wherein the housing has a sound mouth on the other side of the front sound cavity opposite the sound exit surface; and the sound mouth cross-sectional area is less than or equal to The sound surface. 如請求項1的所述反饋主動降噪式的聲腔模組，其中該麥克風為全指向性麥克風。The feedback active noise reduction acoustic cavity module of claim 1, wherein the microphone is an omnidirectional microphone. 如請求項1的所述反饋主動降噪式的聲腔模組，其中還包括一麥克風支撐結構用於連接該麥克風及該殼體。The feedback active noise reduction type acoustic cavity module according to claim 1, further comprising a microphone support structure for connecting the microphone and the casing. 如請求項1的所述反饋主動降噪式的聲腔模組，其中該麥克風設置於該喇叭的一側邊，該出音面垂直該側邊。The feedback active noise reduction acoustic cavity module of claim 1, wherein the microphone is disposed on one side of the speaker, and the sound output surface is perpendicular to the side. 如請求項1的所述反饋主動降噪式的聲腔模組，其中還包括一麥克風訊號連接線，其設置於該前聲腔外部。The feedback active noise reduction type acoustic cavity module according to claim 1, further comprising a microphone signal connection line disposed outside the front acoustic cavity. 如請求項1的所述反饋主動降噪式的聲腔模組，其中該麥克風以及該出音嘴投影至該出音面的一平面上時不重疊。The feedback active noise reduction acoustic cavity module of claim 1, wherein the microphone and the sound mouth do not overlap when projected on a plane of the sound exit surface. 如請求項1的所述反饋主動降噪式的聲腔模組，其中該殼體還包括一穿線孔及一洩音孔。The feedback active noise reduction type acoustic cavity module according to claim 1, wherein the casing further comprises a wire hole and a sound leakage hole.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI800159B (en) * 2021-12-15 2023-04-21 溫吉正 Sound cavity module of feedback active noise cancellation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI800159B (en) * 2021-12-15 2023-04-21 溫吉正 Sound cavity module of feedback active noise cancellation

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