201019739 九、發明說明： 【發明所屬之技術領域】 本發明係關於-種制噪耳機，特別是 佳耳機輸出頻率響應曲線之耳道式制噪耳機。 f先前技術】 目前習知制噪耳機内部至 稱喇队）及一麥克風，笋 °又-揚聲器（或 波，並將1轉化Α 由麥克風所接收外界的噪音聲 ㈣路會相對應於噪音訊號而 ^電路=制 至揚聲器，並使揚聲哭得以產“反相訊破以輸出 相聲波作為干仔以產生與噪音聲波反相之-反 马干涉，而達到制噪之效果。 意圖^圖^戶^圖耳道式制噪耳機之示 體I 一耳塞件U、J^聲=機主要是由一耳機殼 哔雷腺“ 知聲盗12、一麥克風13及一制 木私路14所組成，其中耳塞 太 j及制 之開放端，兩者組合後可 糸套没在耳機殼體1〇 制哞雷踗U 置％聲器12、麥克風13；5 制永電路14，且揚聲器12與 兄八U及 線15電性連接^ 風3 ^各藉由—導201019739 IX. INSTRUCTIONS: [Technical Field] The present invention relates to a noise canceling earphone, and particularly an ear canal noise canceling earphone with a good frequency response curve of a headphone output. f prior art] currently known as noise-making headphones inside the racquet) and a microphone, bamboo shoots and speakers (or waves, and 1 conversion Α external noise received by the microphone (four) road will correspond to the noise signal And ^ circuit = system to the speaker, and make the sound of crying to produce "reverse signal breaking to output the phase acoustic wave as a dry child to produce anti-horse interference with the noise sound wave, and achieve the effect of noise reduction. ^ Household ^ Figure ear canal noise-reducing earphones I I earplugs U, J ^ sound = machine is mainly by a headphone shell 哔 Lei gland " 知 盗 12, a microphone 13 and a wooden private road 14 The composition, wherein the earplug is too j and the open end of the system, the combination of the two can be set in the earphone housing 1 without the 哞 哞 踗 置 置 置 、 、 、 、 、 、 、 、 、 、 、 、 , , 12 and the brother eight U and line 15 electrical connection ^ wind 3 ^ each by - guide
电『生連接到制诔電路14，若以 V 插入使用者耳道之方向來看 耳塞件U之開放端 聲器12的前方，也 克風13乃是設置在揚 道之間，藓+ 克風13在揚聲器12鱼耳 间糟由如此之配置方、， υ興耳 之聲波係可由麥克風13先 "益12輪出至耳道 路14處理後再由 收’並直接透過制噪電 輪出，此稱後饋式主動制噪- 201019739 技術（Feed-Back active noise cancelling technology )， 此技術可監測最後進入耳朵的噪聲訊號，因此具有較佳 的主動制噪效果。 • 上述後饋式主動制噪技術的配置方式，實際上較常 見於耳罩式耳機或耳塞式耳機，由於與耳道之間形成的 •腔體空間較大，因此在輸出頻率響應曲線上大致上還能 保持與未加入制D喿技術前相似，然而後饋式主動制噪技 術結合在耳道式耳機時，則因為與耳道之間形成的腔體 ❹ 變小，其輸出頻率響應曲線即有較為顯著的差異，請參 閱第1B圖所示，其即為第1A圖之耳道式制噪耳機之 頻率響應曲線圖，如圖所示，習知耳道式制噪耳機之頻 率響應曲線S1在3000HZ〜6000HZ的高頻區段之間具有 較為顯著的共振衰減（產生顯著的波谷），然而一般人正 常可聽頻率範圍雖在20HZ〜20000HZ之間，但實際上較 為敏感的區域是在2000HZ〜3000HZ之間，樂器的演奏 @ 則是最高可達4000HZ，也就是說，在習知耳道式制噪 耳機頻率響應曲線S1產生衰減的3000HZ〜6000HZ的高 頻區段乃過於揍近甚至覆蓋敏銳聽覺下的頻率範圍，由 此可證習知耳道式制噪耳機在高頻段的聲音輸出表現 因為麥克風的設置位置而被犧牲，實非使用者所樂見。 爰因於此，如何提供一種輸出頻率響應曲線較佳之 制噪耳機，乃為當前的重要課題之一。 【發明内容】 201019739 述課題，本發日狀目的為提供—種同時提 功此又能確保較佳耳機輸出頻率響應曲線之制 ❹ 緣疋’為達上述目的，本發明之制噪耳機包括 機本體#聲盗、一麥克風及一訊號處理器，耳機 二具有-腔室及一導音管’揚聲器及麥克風皆設置於腔 至内’且揚聲器提供聲音訊號並由導音管輪出，麥克風 聲器旁並接收腔室内聲音訊號，訊號處理器 =疋同㈣性連接於揚㈣及麥克風，賴處理器提供 給揚聲器以轉換為聲音訊號’而麥克風則將接收 之聲曰訊賴換為電訊號以傳送至訊號處理器 號處理器針對聲音訊參者中嫌令差社―v 田訊 反相訊號加入^聲器田中被疋義為噪音之部份輪出 用緣ίΓ ΐ達上述目的，本發明之制噪耳機係於腔室 周開口’且藉由—阻尼件設置於開口上而得控 ❹ 態’而此阻尼件係可設計為可替換式或 移動式，藉以改變腔室與外界連通的程度。 1本f0"之制噪耳機藉由將麥克風安“置於揚聲 “，大_縮揚聲器與導音f之間的 機在人耳可感知的高頻衰減效應2 ^出人耳可感知的更高頻區段；緣因於此，本發明所 規之制。呆功能並不會犧牲原本耳機所需具備的高頻 表見’反而疋給予了使用者更佳的聽覺享受，進一 言，本發明在腔室周緣更可設置m藉由 201019739 2控制心與外界連通的域，其可使彳寻㈣ y不因在固定頻率區段内涵蓋較大範圍的制啤分: _故得以在不同頻率下皆平均地達到制輕果，所^ 肢·表現出的制噪效果更為提升。 , 【實施方式】 ’說明依據本發明較佳實施例 Φ ❹ 以下將參照相關圖式 之一種制噪耳機。 睛參照》2圖所示，為本發明第一實施例之制吟耳 機之剖面示意圖。本發明制噪耳機包括有一耳機本體 20' —揚聲器30、一麥克風40及一訊號處理器5〇。= ::體20具有一腔室21及一導音管22,腔室Η藉由 V音管而與外界連通，揚聲器30及麥克風4〇 ^設 置士腔室21中’而揚聲器3〇的設置將腔室分隔為—前 腔至211與一後腔室212，麥克風4〇則是設置在揚聲器 3〇旁且位於前腔室211之中，訊號處理器50則是同二 連接於揚聲器30及麥克風4〇,且提供冑訊號給揚 聲~ 30以轉換為聲音訊號而從導音管輸出，而麥克 風牝係接收腔室21内之聲音訊號以轉換電訊號傳送至 ^旒處理器50，並由訊號處理器5〇對聲音訊號當中被 定義為策音之部份輸出反相訊號以加入揚聲器30。 4=別須要注意的是，由於本發明之麥克風4〇係設 置，揚聲器30旁，因此可將揚聲器30到導音管22之 距離D設計到小於麥克風4〇的直徑L，甚至是小於麥 201019739 克風的厚度w ^ 後“二？此實施例#中，耳機本體20㊣包括有-1;# ; °於腔室21上’並形成一容置空間24以供 :=器5。設置；再者，在導音管22的開口端設置 m ’、’罔25，用以阻絕雜物或灰塵進入土总. ==:性_成，便且舒適地塞 著參照第3圖所示’為本發明第—實施例之制 木耳機/、習知制料機的頻率響應之比較圖，1中橫轴 2率值，縱轴為分貝值。由於本發明第—實施例當令 風40叹置在揚聲器3〇旁，因此揚聲器3〇可以設 置在非常接近導音管22的位置，且如此—來麥克風如 仍然可以直接地在腔室21内接收揚聲器30的聲音輸出 ，但凡全不會在揚聲器3〇到導音管22的 ❹ 擾，因此在第3A圖當中，本發明第—實施例制;= 之頻率響應曲線F1與習知制噪耳機之頻率響應曲線^ 相較之下，頻率響應曲線”產生顯著衰減的區段向德 移至ιοοοοΗζ之後’由於10000HZ之後的頻率範圍已 = =可感受之區段’因此對於使用者的影 在此必須補充說明的是，第3圖所表現出較佳的 率響應雖然是在揚聲器30到導音管22之距離D小於麥 克風40之厚度|的情況下’然實際上只要將麥克風切 10 201019739 不擋住揚聲器30出音路徑上即有一定的效果， 二2 Γ知’將揚聲器30到導音管22之距離D設計到+ 镅 風40之直徑乙亦可達到將產生衰減之區段往 頻區移動之功效。 ^ ,耳播> Γ第4圖所示，為本發明第二實施例之制噪 =之=示意圖。此實施例之制噪耳機亦由一耳機本 魯 Ο 所組成，妙揚聲^ 3〇、—麥克風4〇及一訊號處理器50 、、、成’此實施例與第本絲办丨々董w> 體2〇之Π 2Ι μ ^縣於耳機本 腔至21之周緣設置有一開口 27，The electric motor is connected to the brake circuit 14, and if the V is inserted into the ear canal of the user to see the front end of the open end sounder 12 of the earplug U, the wind 13 is disposed between the lifts, 藓+g The wind 13 is so arranged between the fish ear of the speaker 12, and the sound wave system of the Xingxing ear can be processed by the microphone 13 first and then the 12 rounds are processed to the ear road 14 and then received and directly passed through the noise-making electric wheel. This is called Feed-Back Active Noise Cancellation Technology. This technology monitors the noise signal that finally enters the ear, so it has better active noise-making effect. • The configuration of the above-mentioned feed-back active noise-making technology is actually more common in earmuff headphones or earphones. Because of the large cavity space formed between the ear canal, it is roughly on the output frequency response curve. It can also be kept similar to that before the un-added D喿 technology. However, when the feed-back active noise-making technology is combined with the ear canal earphone, the output frequency response curve is formed because the cavity ❹ formed between the ear canal becomes smaller. There is a significant difference, please refer to Figure 1B, which is the frequency response curve of the ear canal noise-making headphones of Figure 1A. As shown in the figure, the frequency response of the conventional ear canal noise-making headphones Curve S1 has a relatively significant resonance attenuation (generating significant trough) between the high frequency sections of 3000HZ~6000HZ. However, the normal human audible frequency range is between 20HZ and 20000HZ, but the actually sensitive area is Between 2000HZ and 3000HZ, the performance of the instrument is up to 4000HZ, that is to say, the high frequency section of 3000HZ~6000HZ which is attenuated by the frequency response curve S1 of the conventional ear canal noise-making headphone is Near the beat frequency range to cover even under acute hearing, by the conventional license this ear canal headphone system noise performance because the installation position of the microphone in the sound output of the high frequency band is sacrificed, the user would like to see the non-real. Because of this, how to provide a noise-canceling headphone with better output frequency response curve is one of the current important topics. SUMMARY OF THE INVENTION 201019739 The subject of the present invention is to provide a kind of simultaneous improvement, which can ensure the better response of the output frequency response curve of the earphone. For the above purpose, the noise-making earphone of the present invention includes the machine. The main body #声盗, a microphone and a signal processor, the earphone 2 has a - chamber and a sound tube 'speaker and microphone are set inside the cavity' and the speaker provides an audio signal and is turned by the sound tube, the microphone sound Next to the device and receiving the sound signal in the chamber, the signal processor = the same (four) is connected to the Yang (four) and the microphone, the processor is provided to the speaker to convert into an audio signal, and the microphone converts the received sound signal into a signal signal. In order to transmit the signal to the processor, the processor is added to the voice of the voice-receiving agent, and the voice of the field is added to the sound of the sounder. Tanaka is the part of the noise that is used for the purpose of the above-mentioned purpose. The noise canceling earphone of the invention is connected to the peripheral opening of the chamber and is controlled by the damping member being disposed on the opening. The damping member can be designed to be replaceable or movable, thereby changing the chamber. The degree of communication with the outside world. 1 f0" noise-causing earphones by placing the microphone in the "sound", the high-frequency attenuation effect that the machine between the large-shrinking speaker and the guiding sound f can perceive in the human ear 2 ^ can be perceived by the human ear A higher frequency section; for this reason, the system of the present invention. The function of staying does not sacrifice the high-frequency meter that the original earphone needs. Seen, instead, it gives the user a better hearing enjoyment. In other words, the invention can be set at the periphery of the chamber by controlling the heart and the outside world by 201019739 2 Connected domains, which can be used to find a large range of beer in a fixed frequency segment: _ so that the light fruit can be achieved evenly at different frequencies. The noise reduction effect is further enhanced. [Embodiment] A description will be made in accordance with a preferred embodiment of the present invention. Φ ❹ A noise canceling earphone will be referred to below with reference to the related drawings. Fig. 2 is a cross-sectional view showing the earphone of the first embodiment of the present invention. The noise canceling earphone of the present invention comprises a headphone body 20' - a speaker 30, a microphone 40 and a signal processor 5A. =: The body 20 has a chamber 21 and a sound guide tube 22, and the chamber 连通 communicates with the outside through a V sound tube, and the speaker 30 and the microphone 4 are disposed in the chamber 21 and the speaker 3 is set. The chamber is divided into a front cavity to 211 and a rear chamber 212, a microphone 4 is disposed beside the speaker 3〇 and located in the front chamber 211, and the signal processor 50 is connected to the speaker 30 and The microphone is 4 〇, and a 胄 signal is provided to the singer ~ 30 for conversion to an audio signal and output from the sound tube, and the microphone 牝 is received by the audio signal in the chamber 21 to convert the electrical signal to the processor 50, and The signal processor 5 输出 outputs an inverted signal to the portion of the audio signal defined as the sound to be added to the speaker 30. 4=It should be noted that since the microphone 4 of the present invention is disposed adjacent to the speaker 30, the distance D from the speaker 30 to the sound guide tube 22 can be designed to be smaller than the diameter L of the microphone 4〇, even smaller than the wheat 201019739. The thickness of the wind is w ^ after "two? In this embodiment #, the earphone body 20 is including -1; #; ° on the chamber 21' and forms an accommodation space 24 for: = 5; setting; Furthermore, m ', '罔25 are provided at the open end of the sound guiding tube 22 to prevent debris or dust from entering the soil. ==: Sexuality is formed, and it is comfortably plugged as shown in Fig. 3' For comparison of the frequency response of the wood-making earphone/the conventional material-making machine according to the first embodiment of the present invention, the horizontal axis 2 rate value and the vertical axis are decibel values in 1. The first embodiment of the present invention sighs the wind 40 Placed next to the speaker 3〇, the speaker 3〇 can be placed in a position very close to the sound tube 22, and as such, the microphone can still receive the sound output of the speaker 30 directly in the chamber 21, but none of them will The speaker 3 is turbulent to the sound tube 22, so in the 3A, the first embodiment of the present invention ;= The frequency response curve F1 is compared with the frequency response curve of the conventional noise-making earphones ^, the frequency response curve "significantly attenuated section shifts to ιοοοοΗζ" since the frequency range after 10000HZ has == The section of the experience 'so the user's shadow must be added here, however, the better rate response shown in Figure 3 is that the distance D from the speaker 30 to the sound tube 22 is less than the thickness of the microphone 40 | In the case, 'actually, just cut the microphone 10 201019739 does not block the speaker 30 on the sound path, there is a certain effect, 2 2 knows 'the distance D from the speaker 30 to the sound tube 22 is designed to + the diameter of the hurricane 40 B can also achieve the effect of moving the attenuated section to the frequency zone. ^, earphones> Fig. 4 is a schematic view showing the noise suppression = the second embodiment of the present invention. The noise-making earphone of this embodiment is also composed of a headphone, Lu Xun, a microphone, a microphone, a microphone, and a signal processor 50, and the like. w> Body 2〇2Π μ ^ County has an opening 27 in the periphery of the earphone to the periphery of 21,
二係可開設在靠近導音管22旁的位置，且腔室 對應：開口 27設置有-通…供容置一阻尼J :阻尼件6〇的設置可調整開口 27的啟閉，亦可藉 ，整節腔室21内部與外界的連通程度，例“ 。周整為王開啟 '全關閉或部份地開啟。 請再參照第5Α至5C圖所示，為 — 例之制噪耳機在不同的開啟 _ a —實施 u日]闻口啟閉狀態下的頻變 、收音相位圖及制噪表現圖。在第5A圖當中，二： 利用阻尼件6〇封閉開口 27時，在腔室 使用者 頻率響應曲線F2,而當移動阻尼件6〇開可測得一 ’在腔室21内可測得另一頻率響應曲；二； 5B圖，在開口 27封閉的情況下，麥克 對應於弟. —聲音訊號係可產生相位曲線P2， 所接收之 情況下，麥克風4。所接收之另一聲音訊二2;;敌的 位曲線P3 ;再對應於第5c圖，在開口 ’、了產生相 封閉的情況 11 201019739 下’腔室21内传兄 開啟的情況下，腔室/噪曲，線八2,而在開口 27 綜觀第5八=:係可測得另-制噪曲線-I。 C圖所不之各曲線，當控制開口 27 21'内之聲才立.悉至開啟狀態時’麥克風40所接收腔室 線由封閉時的近 :广因而使仔其制噪曲 此制噪表規-^Ϊ 化為近梯形波形狀，而在 不忍圖虽中，在—定的頻率區段内所涵蓋較 :圍：制噪分貝值，表示在不同頻率下皆能平均地達 制％的效果，其整體表現出的制噪效果即較佳。 "月參第6圖所示’為本發明第三實施例之制噪 機之剖=意圖。此實施例之制料機亦由—耳機本體 20、一揚聲器30、一麥克風4Q . 及一訊號處理器50所 ^此貫施例與第二實施例之差異係在於耳機本體 之開口 27直接設置一阻尼件7〇，此阻尼件川係可 :換地设置在開口27 i，而藉由不同阻尼係數的阻尼 件70的置換，亦可達到不同頻率響應的需求， 阻尼件70可達到的效果近似於第二實施例以阻6〇 在通道28中來回啟閉之效果，故在此即不另作贅述。 上述第二實施例及第三實施例之制噪耳機分=蕪 由胆尼件60、70來控制腔室21與外界連通的程度，= 觀察第5A至5C圖所示之各曲線後」係可知阻尼^件^ 使得開口 2 7由封閉狀態至開啟狀態時可得到較1的6 〇 噪政果，也就是說，如果耳機本體2〇僅設置口制 丄 2 7 ffrt 未設置阻尼件60、70，那麼也可以改變腔金〇 主U内之頻 12 201019739 :/應表;見而達到如第5C圖當中制噪曲線A3 策效果。 的制 最後必須補充的是，本發明上述各實施例所揭敦之 -聲器皆為動圈式揚聲器，但基於本發明概念下 塑;^ 士 h 為動鐵式揚聲11，此置換將不致馬 喜原本猎由本發明概念所^成之功 外繪製圖式及說明。 ί7不另 晉t所述，本發明制噪耳機之藉由將麥克風安排机 、揚聲盗旁，大幅減縮揚聲器與導音間又 2使得原本習知制噪耳機在人耳可離， 效應發土在超出人耳可感知的更高頻區段，如此=咸 σ入制木功硓當不致犧牲了原本 .表現，而能給予使用者更佳的斤=備的南頻 制噪耳機在腔室周緣係設置二：于;夢：者’本發明 控制開口的π啟ϋ 0 9 開口亚猎由—阻尼件以 匕制開口的開啟或關閉狀 魯 開啟狀態時，腔室内〆也丨—主 關閉狀態至 imu 制木表現因為在固定頻率區段内 =盍較大_的制噪分貝值，故得以在 = 佳。、登體表現出的制噪效果即較 以上所述僅為舉例性，而非為限制性/ 離本發明之籍神盘& * 者。任何未脫 μ月之精神與乾臂’而對其進行之 ，均應包含於後附之中請專利範圍中。，改或皮更 【圖式簡單說明】 13 201019739 第1A圖為習知制噪耳機之示意圖； 第1B圖為第1A圖之頻率響應曲線圖； 第2圖為本發明第一實施例 墙，一 市j木耳機之剖面不意圖； 第3圖為本發明第一實施例 μ J之制呆耳機與習知制噪耳 機的頻率響應之比較圖； :;圖為本發明第二實施例之制噪耳機之剖面; 第5A圖為本發明第二實施例之制噪耳機之頻率響應圖 第5B圖為本發明第二實施例之制噪耳機 之收音相位圖 ❹ 弟=圖為本發明第二實施例之物機之嶋現 圖 第6圖為本發明第三實施例之制噪耳 機之剖面示意圖。 元件符號說明： 10 耳機殼體 12 揚聲器 14 制噪電路 S1 頻率響應曲線 20 耳機本體 211 前腔室 22 導音管 24 容置空間 26 耳塞件 11 耳塞件 13麥克風 15 導線 21 腔室 212 後腔室 23 後蓋 25 隔網 27 開口 14 201019739 28 通道 30 揚聲器 40 麥克風 50 訊號處理器 60 阻尼件 70 阻尼件 D 距離 L 直徑 W 厚度 FI 頻率響應曲線 F2 頻率響應曲線 F3 頻率響應曲線 P2 相位曲線 P3 相位曲線 A2 制噪曲線 A3 制噪曲線 15The second system can be opened near the sound guiding tube 22, and the chamber corresponds to: the opening 27 is provided with - a... for accommodating a damping J: the setting of the damping member 6 is adjustable to open and close the opening 27, and can also be borrowed The degree of communication between the interior of the entire chamber 21 and the outside world, for example, "the whole week is the king's open" is fully closed or partially turned on. Please refer to the fifth to fifth pictures, for example, the noise-making headphones are different. Turn on_a - implement u day] frequency change, radio phase diagram and noise generation performance diagram in the open and close state of the mouth. In the 5A picture, 2: when the opening 27 is closed by the damper 6〇, it is used in the chamber The frequency response curve F2, and when the moving damper 6 is opened, it can be measured that another frequency response curve can be measured in the chamber 21; 2; 5B map, in the case where the opening 27 is closed, the microphone corresponds to the younger brother - The sound signal can produce a phase curve P2, in the case of reception, the microphone 4 receives another sound signal 2;; the enemy's bit curve P3; and then corresponds to the 5c picture, at the opening ', produced Phase-closed case 11 201019739 Under the condition that the chamber 21 is open, the chamber/noise , line 8 2, and in the opening 27 to see the 5th 8 =: can be measured another - noise curve -I. C curve is not the curve, when the sound in the control opening 27 21' is established. In the state, the microphone line received by the microphone 40 is closed by the close: wide so that the noise-making gauge of the microphone 40 is reduced to a nearly trapezoidal wave shape, and in the case of the unbearable picture, The coverage in the frequency section is: the surrounding noise: the decibel value of the noise, which means that the effect of the average % can be achieved at different frequencies, and the overall noise-making effect is better. "月参第6图The cut-out of the noise-making machine of the third embodiment of the present invention is intended. The material-making machine of this embodiment is also composed of the earphone body 20, a speaker 30, a microphone 4Q, and a signal processor 50. The difference between the embodiment and the second embodiment is that the opening 27 of the earphone body is directly provided with a damper member 7〇, which can be disposed in the opening 27 i, and replaced by the damping member 70 with different damping coefficients. The requirement of different frequency response can also be achieved, and the damper 70 can achieve an effect similar to that of the second embodiment. The effect of opening and closing in the channel 28 is not described here. The noise canceling earphones of the second embodiment and the third embodiment are controlled by the jewels 60, 70 to control the chamber 21 to communicate with the outside. The degree of =, after observing the curves shown in Figures 5A to 5C, it is known that the damping member ^ can make the opening 2 7 from the closed state to the open state to obtain a more than 6 noise reduction effect, that is, if Headphone body 2〇 only set the port system 丄 2 7 ffrt No damping member 60, 70 is not provided, then the frequency of the cavity gold 〇 main U can be changed 12 201019739 : / should be table; see the noise-making curve as shown in Figure 5C A3 effect. Finally, it must be added that the sound absorbers disclosed in the above embodiments of the present invention are all moving coil speakers, but based on the concept of the present invention; ^ 士 h is the moving iron type speaker 11, the replacement will not Ma Xi originally hunted the drawing and description by the concept of the invention. According to the ί7, the noise-making earphone of the present invention can greatly reduce the speaker and the sound-guiding room by arranging the microphone, and the speaker can be separated from the speaker. The soil is beyond the higher frequency section that the human ear can perceive, so = salty sigma into the wooden work, it will not sacrifice the original performance, but can give the user a better jin = prepared south frequency noise-causing headphones in the cavity The peripheral system of the room is set to two: Yu; Dream: 'The π start of the control opening of the present invention 0 9 Opening the sub-hunting--damper member to open or close the open state of the opening, the chamber is also 丨-- The closed state to imu wood performance is better because it is in the fixed frequency range = 盍 larger _ noise decibel value. The noise-making effect exhibited by the boarding body is only exemplified as described above, and is not intended to be limiting/from the invention of the invention. Anything that has not been removed from the spirit and the dry arm of the month should be included in the scope of the patent. , change or skin more [schematic description] 13 201019739 Figure 1A is a schematic diagram of a conventional noise-making earphone; Figure 1B is a frequency response curve of Figure 1A; Figure 2 is a wall of the first embodiment of the present invention, FIG. 3 is a comparison diagram of the frequency response of the first earphone of the first embodiment of the present invention and the conventional noise-making earphone; FIG. 3 is a second embodiment of the present invention; Section 5A is a frequency response diagram of a noise canceling headphone according to a second embodiment of the present invention. FIG. 5B is a diagram showing a radio phase diagram of a noise canceling headphone according to a second embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 6 is a cross-sectional view showing a noise canceling earphone according to a third embodiment of the present invention. Component symbol description: 10 Headphone housing 12 Speaker 14 Noise reduction circuit S1 Frequency response curve 20 Headphone body 211 Front chamber 22 Sound tube 24 Housing space 26 Earplugs 11 Earplugs 13 Microphone 15 Wire 21 Chamber 212 Rear cavity Room 23 Back cover 25 Spacer 27 Opening 14 201019739 28 Channel 30 Speaker 40 Microphone 50 Signal processor 60 Damping member 70 Damping member D Distance L Diameter W Thickness FI Frequency response curve F2 Frequency response curve F3 Frequency response curve P2 Phase curve P3 Phase Curve A2 Noise Making Curve A3 Noise Making Curve 15