479438 A7 五、發明說明（ ：ii朋描述 本發明係關於一聲音裝晋σ q蒗置，特別是一分佈模態裝置。 (請先閱讀背面之注意事項再填？本頁) 平板型彎曲波模態揚聲器 匁卑态已為人所熟知，例如專利 W 0 9 7 / 0 9 8 4 2所提出。此々、十址4致一 此6又件揭不了一種具有放射器 組件的杨聲器’及一個在姑私哭知从丄 在玟射态組件中激發偏向波的激發 器。 Λ 放射器組件的形狀及其材料特性決定了—些放射器組件 的共振彎曲波模態’每_個皆具有特定的模態形狀及頻 率。這些參數的選定，可以使得放射器组件的共振弯曲波 模態，以頻率方式被分佈在運作頻率範圍之内。藉由將共 振彎曲波模態儘可能地以頻率方式平均地分佈，即可使聲 音裝置的聲音響應也可能地以頻率方式平均地分佈，而可 避免在響應中過多的沉降及突出^ 專利W0 9 7/0 9 8 42所提，將激發器置於模態被平均激 發之處，也就是一種激發器的位置，此位置是與平均地耦 合於所有的模態之位置距離愈遠愈好。 經濟部智慧財產局員工消費合作社印製 這些模態是零星地以頻率方式分佈在運作頻率範圍的較 低的部份，因此其是位在最能夠平均地激發模態的頻率區 域中。因此，激發器的位置可以在運作頻率範圍的較低部 份，而平均地搞合於所有的共振彎曲波模態。 通常在面板上也有一些折衷性的位置，也可平均地輕合 於一些模態，專利W 0 9 7 / 0 9 8 4 2中也揭示了在許多個這 樣的位置上放置複數個激發器。 本紙張尺度適用中關家標準（CNS)A4規格（210 X 297公髮) "---------— Λ7 Λ7 B7479438 A7 V. Description of the invention (: ii describes the invention as a sound device σ q set, especially a distributed modal device. (Please read the precautions on the back before filling this page?) Flat bending wave Modal loudspeakers are well known, such as proposed by the patent W 0 7 7/0 9 8 4 2. This, 10 addresses 4 to 1 and 6 can not expose a Yang speaker with a radiator assembly 'And an exciter who knows in a private way that excites the deflection wave from the plutonium radiation state component. The shape and material characteristics of the Λ radiator component determine the resonant bending wave modes of these radiator components. Each has a specific modal shape and frequency. The selection of these parameters can make the resonant bending wave mode of the radiator component be distributed in the frequency range of the operating frequency. By making the resonant bending wave mode as much as possible Evenly distributed in the frequency manner, the sound response of the sound device may be evenly distributed in the frequency manner, and excessive settlement and prominentness in the response can be avoided ^ As mentioned in the patent WO 9 7/0 9 8 42, Exciter placed Where the states are excited on average, that is, the position of an exciter, this position is as far as possible from the position that is evenly coupled to all the modalities. The employees' cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs print these modalities sporadic Ground is frequency-distributed in the lower part of the operating frequency range, so it is located in the frequency region where the modalities are most evenly excited. Therefore, the position of the exciter can be in the lower part of the operating frequency range. And it fits all resonance bending wave modes evenly. Usually there are some compromised positions on the panel, and it can also fit some modes evenly. It is also disclosed in the patent W 0 7 7/0 9 8 4 In order to put a plurality of exciters in many of these positions. This paper size is applicable to Zhongguanjia Standard (CNS) A4 specification (210 X 297), " ----------- Λ7 Λ7 B7
五、發明說明（2 、根據本發明所提供的一聲音裝置，其包含有一面板，可 、援複婁欠個共振彎曲波模態，其中每一個模態皆有一共 (請先閱讀背面之注意事項再填f本頁) 振，、率Λ共振曾曲波模態係劃分為複數個相重叠的模態 羊、且及換能器，其位置可優先地耦合於該模態群組中 的一個。 根據本敖月，並不需要將激發器放置在一個或多個特定 位置，纟儘可能地平均地搞合於所有的共a彎曲波模態， 或甚土所有較低共振彎曲波模態。這樣的激發器位置不可 U免地疋一種折衷方式。更精確地說，僅需要找出能夠平 均地耦合於一個群組的激發器位置，也就是一共振彎曲波 模態的子集合。 模態群組並不僅是劃分成不同頻率範圍的群組，更精確 地說，為具有重疊共振頻率的模態群組。當然，個別模態 的正確頻率，除非特殊狀況，皆是相同的頻率，但整體而 言’模態群組皆大致落在相同的頻率範圍内。 較佳地是，每一個群組的模態皆大致正交於不是該群組 的模態。 經濟部智慧財產局員工消費合作社印製 彎曲波模態的群組可以是奇數模態及偶數模態。一種劃 分可數及偶數模態的方法是以頻率漸增的順序將模態進行 編號；然後，奇數模態即為那些編號為奇數的，而偶數模 態即為偶數編號的模態。 如此劃分成奇數及偶數模態，可以產生兩組大致正交的 模態。然後，換能器的位置可對一個或其它的群組進行最 -5- 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 479438 Λ7 B7 五、發明說明（3 ) 佳化。 (請先閱讀背面之注意事項再填f本頁) 另外，奇數模態對於一預定的軸為非對稱性的對稱模 態’此軸基本上為共振面板的對稱軸之一。舉例而言，當 面板為長方形時，奇數模態可以是關於平行於長方形短邊 的軸的非對稱模態。偶數模態則為關於同樣的軸的對稱模 怨。對於一橢圓形面板，非對稱及對稱模態則為相對於橢 圓的短軸的對稱性。 很重要地是必須區分出沿著該軸的非對稱於此軸及模態 的不同模態。一些共振彎曲波模態具有一模態形狀，其中 面板與面板的中央平面的距離，會沿著一軸而改變，而不 是沿管一正交軸改變。這些模態基本上為一維空間，並可 稱之為沿著該單一軸的模態。圖丨會在下面做進一步的討 論，但其可在此處簡單地說明，其所示的n = 2模態為沿著 X軸的模態，也就是該軸而改變，而所示的n = 3模態則為 /口著y軸變化。沿著某一軸的模態係指對該軸對稱，但可 以是對其正交軸對稱或是非對稱。 如果其中有兩個對稱軸，模態則可對於每一個對稱軸稱 經濟部智慧財產局員工消費合作社印製 之為非對稱或對稱。共振彎曲波模態因此可以劃分為四個 杈悲群組·非對稱/非對稱，如.果它們是對於每一對稱軸 皆為非對稱；#對稱/對稱，⑹果它們是沿著長軸非對 稱，而對於短軸對稱；對稱/非對稱，如果係對長軸對V. Description of the invention (2) A sound device provided according to the present invention, which includes a panel that can restore Lou's resonance bending wave modes, each of which has a total (please read the note on the back first) Please fill in this page again.) The vibration, Λ resonance, and zigzag mode system is divided into a plurality of overlapping modal sheep and transducers, and their positions can be preferentially coupled to the modal group. A. According to Ben Aoyue, there is no need to place the exciter at one or more specific positions, and I want to fit all the common a bending wave modes, or all lower resonance bending wave modes, as evenly as possible. Such a position of the exciter cannot avoid a compromise. More precisely, it is only necessary to find the position of the exciter that can be evenly coupled to a group, that is, a subset of the resonant bending wave mode. The modal group is not only a group divided into different frequency ranges, but more precisely, a modal group with overlapping resonance frequencies. Of course, the correct frequency of individual modes is the same frequency unless special circumstances But whole In terms of modal groups, they all fall roughly within the same frequency range. Preferably, the modalities of each group are generally orthogonal to the modalities that are not the group. The Intellectual Property Bureau, Ministry of Economic Affairs, Consumer Consumption Cooperative The groups of printed bending wave modes can be odd and even modes. One way to divide the countable and even modes is to number the modes in order of increasing frequency; then, the odd modes are those The odd-numbered modes are the even-numbered modes. Dividing the odd-numbered and even-numbered modes in this way can produce two groups of approximately orthogonal modes. Then, the position of the transducer can be set to one or the other. The group size is -5- This paper size is applicable to Chinese National Standard (CNS) A4 specification (210 X 297 mm) 479438 Λ7 B7 V. Description of the invention (3) Optimization. (Please read the notes on the back before filling in f (This page) In addition, the odd mode is a symmetrical mode that is asymmetric with a predetermined axis. This axis is basically one of the symmetry axes of the resonant panel. For example, when the panel is rectangular, the odd mode can be About parallel to long The asymmetric mode of the axis of the short side of the shape. The even mode is a symmetry mode about the same axis. For an oval panel, the asymmetric and symmetric modes are symmetry with respect to the short axis of the ellipse. Very It is important to distinguish between different modes that are asymmetrical to this axis and modes along the axis. Some resonant bending wave modes have a modal shape, where the distance between the panel and the center plane of the panel will be along an axis Instead of changing along an orthogonal axis of the tube. These modes are basically one-dimensional space and can be called modes along the single axis. Figure 丨 will be discussed further below, but it can be It is briefly explained here that the n = 2 mode shown is a mode along the X axis, that is, the axis is changed, and the n = 3 mode shown is changed along the y axis. A modal along an axis means that it is symmetrical about the axis, but it can be symmetrical or asymmetric about its orthogonal axis. If there are two axes of symmetry, the modal can be called asymmetry or symmetry for each axis of symmetry. Resonant bending wave modes can therefore be divided into four branch groups. Asymmetric / asymmetric, such as. If they are asymmetric for each axis of symmetry; # symmetric / symmetric, they are along the long axis Asymmetric, but symmetric for short axis; symmetric / asymmetric, if
稱，而對於短轴非對稱；或，對稱/對稱，如果對於 軸皆對稱。 U -6 - 479438 經濟部智慧財產局員工消費合作社印製 A7 " -------------— 五、發明說明（4 ) 在具體實施例中，換能器可配置成優先地輕合於部份或 所有的模態。特別是，對稱/對稱模態可以比其它模能， 非對稱/非對稱、非對稱/對稱、對稱/非對稱，都更:強 力地輕合於週邊環境，例如外牆或外殼。將一個或多個換 能器優先地搞合至非對稱/非對稱，非對稱/對稱，及/或 對稱/非對稱模態會有優點，但需要儘量避免镇合於對稱/ 對稱模態。以此方式製造的揚聲器，與所有模態皆同等地 耦合之揚聲器相較，會降低其與週邊環境的互動。 另一個換能器或多個換能器可以用來優先地耦合於其它 的模態群組。每一個模態群組皆可耦合於一個或其它換能 器。在此具體實施例中，奇數模態係耦合於一換能器，而 偶數模態則耦合至另一個換能器。每一個換能器的位置可 以個別地對相關的模態群组進行最佳化；由此可以得到比 對於所有模態的每一個換能器都進行最佳化的結果要好。 聲音裝置可以是一揚聲器，此換能器或多個換能器可以 是一激發器，用以激發面板的模態而使面板產生聲音輸 出。 第一方面來說，本發明提供一面板，其中一換能器是安 裝於圖3或4中以’’ X ’’標示區域之一。較佳地是，一換能器 為於圖3中標示為” X ’’的區域，而一換能器則位於圖*中 以’’ X ’，標示的區域。 本發明也可提供一聲音裝置的製造方法，其包含步驟如 下： 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） „ -----------------Μ (請先閱讀背面之注意事項再填f本頁) 479438 經 濟 部 智 慧 財 產 局 員 工 消 費 合 作 社 印 製 Λ7 H7 五、發明說明（5 ) 提供一面板，其具有複數個彎曲波模態，彎曲波模態被 劃分為複數個模態群組，及 將一換能器安裝於能夠優先地韓合於群組之一的模態的 位置。 為了更加瞭解本發明，以一特定的具體實施例來說明， 其僅做為範例，而可參考附圖，其中： 圖1所示為一共振面板的最低模態； 圖2所示為圖1的面板模態的節線； 圖3所示為圖1的面板的非對稱模態的節線； 圖4所示為圖1的面板的偶數模態的節線； 圖5所示為根據本發明的一揚聲器。 在圖1中，顯示一長方形面板丨，及其)^與7軸。對於二 維的彎曲波等式，存在有一些共振模態。以頻率順序所做 的模態編號以整數n做標示。第〇個模態（n = 〇)相當於面板 1的整體運動，於圖中並未顯示。第一模態（η=ι)，具有 -對如圖所示沿著軸的節、線的最低頻率（位置的軌跡並不 $ );這個模態實際上是—扭曲模態，而不是偏向模態。 第一模恐（η - 2 )事貫上為最低頻率的弯曲波模態，並具有 兩仏即”泉’大致平仃於短軸而延伸，並沿著長軸分開配 置。第三模態(η = 3)有兩條節線，大致平行於長軸而延 伸，並沿著短轴而分開配置。這三種模態示於圖i，圖中 的，，+ ·,及”符號表示出偏向具有正的或負的符號，也就 是在特定時間，是否面板會偏離於中央平面之上或之下。 -8 本紙張尺度適用中國國家標準（CNS)A4 x 297公釐） lit — — — — — — — — 1- · I I I I 1 I I 訂 — — — — — — —-- (請先閱讀背面之注意事項再填ί本頁) 479438 五、發明說明（6 ) 這些模態是依據η的值而劃 數。 才為兩個群組，即奇數或偶 (請先閱讀背面之注意事項再填？本頁) 所示的彎曲波係由理論得出， ,,並代表一四階微分方程式 的解。由求解此方程式而得 、 于Α的杈態，並不像二階方程式 中的間單正弦波，而事實上 - ^ A 為二角幾何與雙曲線三角幾何 函數的組合，如傳統理啥所熱 —一 响所熱知。當然，一實際面板的真 只才吴悲，舉例而言，係依據含世、人 、、 货依錁文裝於面板上而定，像是夾持 方式，或固定於任何盒子t 、 卞上 或位於接近組件的反射板。 然而，仍然可以使用相同的方法。 較低模態的節線係示於圖2，g此r#告丨、上士 μ 口 ζ 乂些即線係劃分為奇數模 態的節線，如圖3所示；及偶 久倘数杈態的郎線，如圖4所 示〇 換能器的位置是由前述專利編號wo97/09842所提 出，其中所有的較低模態皆儘可能地耦合於換能器。為了 造成與模態間炎好的镇合，換能器必須位於離節線一段距 離。不同的適當的區域在圖2中以，，x，，進行標示·，其中一 些位置係由專利W0 9 7/〇 9 842所提出的較佳位置相對 應。 —符號’’X”並不只是標示單一的點，而可針對區域而言。 貫際上’換能器的尺寸有限並位於良好的安裳位置，而換 能器可以位在離節線之外的一適當範圍之内。 適於優先耦合於奇數模式的區域，在圖3中標示 為X，’。這些區域係位於奇數模態的節線之外。同樣地， 9- 本紙張尺度適用中國國家標準（CNS)A4規格（21〇 X 297公釐） 479438 Λ7 五、發明說明（ 適於優先搞合於偶數模式的區域，則在圖4中標示 為，，X，，。 (請先閱讀背面之注意事項再填？本頁) 一第一換能器置於可優先耦合於奇數模態的位置，及一 第一換能器置於可優先耦合於偶數模態的位置。整個面板 的較佳效能’可以藉著使用兩個分別位於適於激發所有模 態的位置而達到。 圖5所示為使用此技術的揚聲器的說明圖。圖5不像是圖 2到4 ,而並沒有依比例繪製。一面板丨具有一第一激發器 3，在一優先激發奇數模態的位置耦合於此面板，及一第 二激發器5，在一優先激發偶數模態的位置耦合於該面 板。 有許多原因可以說明為何用於優先耦合於奇數或偶數的 模態的位置較具優點，尤其是，優先的激發可允許揚聲器 設計者多一個自由度，可以用於調整響應輸出，而使其符 合所需要的聽覺特性。 經濟部智慧財產局員工消費合作社印製 在具體實施例中，這些節點可以劃分成非對稱/非對 稱，對稱/非對稱，非對稱/對稱，及對稱/對稱模態，然 後-個或多個換能器可以區分為激發部份或所有的：些群 組。如果需要避免對稱/對稱模態’例如要降低邊際效 應，然後…固’兩個’或三個換能器可用於優先地激發 非對稱/非對稱，對稱/非對稱，及非對稱/對稱模態。 另-個問題是，典型的慣性激發器韓合於，並量 給-很大範圍的模態。未來，激發器可以用於選擇二 -10- 本紙張尺度適用中國國家標準（CNS)A4規格（21〇 X 297公爱 479438 第89109467號專利申請案 修正頁（9〇年ίο月）It is asymmetric for the short axis; or symmetrical / symmetrical if it is symmetrical for the axis. U -6-479438 A7 printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs " ----------------- V. Description of the invention (4) In a specific embodiment, the transducer can be configured Cheng lightly prioritizes some or all of the modalities. In particular, symmetrical / symmetrical modes can be more than other modes, asymmetrical / asymmetrical, asymmetrical / symmetrical, symmetric / asymmetrical: they are lightly fit to the surrounding environment, such as exterior walls or enclosures. Prioritizing one or more transducers to asymmetrical / asymmetrical, asymmetrical / symmetrical, and / or symmetrical / asymmetrical modes has advantages, but it is necessary to avoid asymmetry in symmetric / symmetrical modes as much as possible. A speaker manufactured in this way reduces its interaction with the surrounding environment compared to a speaker in which all modalities are equally coupled. Another transducer or multiple transducers can be used to preferentially couple to other modal groups. Each modal group can be coupled to one or other transducers. In this specific embodiment, the odd-numbered modes are coupled to one transducer, and the even-numbered modes are coupled to another transducer. The position of each transducer can be individually optimized for the associated modal group; this results in better results than optimizing each transducer for all modalities. The sound device may be a loudspeaker, and the transducer or the plurality of transducers may be an exciter, which is used to excite the mode of the panel to make the panel produce sound output. In a first aspect, the present invention provides a panel in which a transducer is installed in one of the areas indicated by '' X '' in Fig. 3 or 4. Preferably, a transducer is an area marked with “X” in FIG. 3, and a transducer is located in an area marked with “X” in FIG. *. The present invention can also provide a sound The manufacturing method of the device includes the following steps: The paper size is in accordance with China National Standard (CNS) A4 (210 X 297 mm) ― ----------------- M (Please (Please read the note on the back before filling in this page) 479438 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs Λ7 H7 V. Description of the invention (5) Provide a panel with multiple bending wave modes. It is divided into a plurality of modal groups, and a transducer is installed at a position capable of preferentially aligning with one of the modal groups. In order to better understand the present invention, a specific embodiment is used for description, which is only used as an example, and reference may be made to the drawings, in which: FIG. 1 shows the lowest mode of a resonance panel; FIG. 2 shows FIG. 1 Fig. 3 shows the nodal lines of the panel of Fig. 1 in an asymmetric mode; Fig. 4 shows the nodal lines of the panel of Fig. 1 in even mode; Invented a speaker. In FIG. 1, a rectangular panel 丨, and its ^ and 7 axes are shown. There are some resonance modes for the two-dimensional bending wave equation. The modal numbers made in frequency order are marked with the integer n. The 0th mode (n = 0) corresponds to the overall movement of panel 1, and is not shown in the figure. The first mode (η = ι) has the lowest frequency of the pairs of nodes and lines along the axis as shown (the locus of the position is not $); this mode is actually a twisted mode, not a bias Modal. The first mode (η-2) is the bending wave mode with the lowest frequency throughout, and has two ridges, that is, the "quan" extends approximately on the short axis and is arranged along the long axis separately. The third mode (η = 3) has two nodal lines that extend approximately parallel to the long axis and are arranged separately along the short axis. These three modes are shown in Figure i, where the +, and "" symbols indicate Bias has a positive or negative sign, that is, whether the panel will deviate above or below the central plane at a particular time. -8 This paper size applies to Chinese National Standard (CNS) A4 x 297 mm) lit — — — — — — — — 1- · IIII 1 II Order — — — — — — — — (Please read the note on the back first Matters need to be refilled on this page) 479438 V. Description of the invention (6) These modes are numbered according to the value of η. Only two groups, that is, odd or even (please read the notes on the back and fill in this page first?) The bending wave system shown is theoretically derived, and represents the solution of a fourth-order differential equation. The branch state in A obtained by solving this equation is not like the indirect single sine wave in the second-order equation, but in fact-^ A is a combination of two-angle geometry and hyperbolic triangle geometry function, as traditional reason -Knowing what it sounds like. Of course, the truth of an actual panel is only Wu Bei. For example, it is based on the contents of the world, people, and goods mounted on the panel, such as the clamping method, or fixed on any box t, 卞Or a reflector located near the component. However, the same approach can still be used. The lower modal nodal lines are shown in Fig. 2. This r # report, the sergeant μ mouth ζ some lines are divided into odd modal nodal lines, as shown in Figure 3; The branched Lang line is shown in FIG. 4. The position of the transducer is proposed by the aforementioned patent number wo97 / 09842, in which all the lower modes are coupled to the transducer as much as possible. In order to achieve a good fit with the modal inflammation, the transducer must be located some distance from the pitch line. The different appropriate areas are marked with ,, x, in Fig. 2. Some of the locations correspond to the preferred locations proposed by the patent WO 9 7 / 〇 9 842. —The symbol "X" is not just a single point, but can be targeted to the area. In the past, the size of the transducer is limited and located in a good position, and the transducer can be located at the nodal line. Within an appropriate range. Areas suitable for preferential coupling to odd-numbered modes are marked X, 'in Figure 3. These areas are outside the nodal lines of the odd-numbered modes. Similarly, 9- this paper scale applies China National Standard (CNS) A4 specification (21 × X 297 mm) 479438 Λ7 V. Description of the invention (suitable for the areas that are preferentially adapted to the even mode, it is marked as ,, X, in Figure 4) (Please first Read the notes on the back and fill in this page again? This page) A first transducer is placed in a position that can be preferentially coupled to the odd mode, and a first transducer is placed in a position that can be preferentially coupled to the even mode. The entire panel The better performance can be achieved by using two positions that are suitable for exciting all modes. Figure 5 shows an illustration of a speaker using this technology. Figure 5 is not like Figures 2 to 4, and Not drawn to scale. A panel has a first excitation 3, coupled to the panel at a position that preferentially excites the odd modes, and a second exciter 5, coupled to the panel at a position that preferentially excites the even modes. There are many reasons why it can be used to preferentially couple to the odd modes. Or even-numbered modal positions have advantages, in particular, prioritized excitation allows the speaker designer one more degree of freedom that can be used to adjust the response output so that it meets the required auditory characteristics. Employees, Bureau of Intellectual Property, Ministry of Economy Printed by consumer cooperatives In specific embodiments, these nodes can be divided into asymmetric / asymmetric, symmetric / asymmetric, asymmetric / symmetric, and symmetric / symmetric modes, and then one or more transducers can be distinguished as Excite some or all: some groups. If you need to avoid symmetric / symmetric modes, for example, to reduce marginal effects, then ... two or three transducers can be used to preferentially excite asymmetric / asymmetric, Symmetrical / asymmetrical and asymmetrical / symmetrical modes. Another problem is that the typical inertial exciter Han Heyu measures a wide range of modes. In the future, the exciter -10- for selecting two of this paper scale applicable Chinese National Standard (CNS) A4 size (21〇 X 297 Kimiyoshi 479,438 patent application No. 89109467 amended page (9〇 years ίο month)
A7 B7 發某些模態的類別；一個例子是在國際專利編號 WOOO/13 4 64中由New Transducers公司所提出的扭力 激發器’其可以選擇性地激發某些模態，或至少可忽略整 體模態。舉例而言，這種扭力激發可由將相對的慣性激發 器放置在節線的兩側來達到。如果激發器係位於圍繞非對 稱群組的一些節線處，或對稱群組，此方法則可允許該模 怨群組的扭力激發。其很難找到適當的位置而同時相等地 激發非對稱及對稱模態，因為沒有一種位置可同時通過非 對稱及對稱模態的大量節線。因此，一種分別激發對稱與 非對稱模態的方法特別適用於使用慣性激發器的扭轉激發 模態。 雖然所述的具體實施例係關於一揚聲器，此優先耦合於 奇數與偶數模態的換能器也可應用到其它分佈模態面板的 應用，例如做為一麥克風或其它聲音裝置。在這些狀況 下’然而這些換能為當然需要適用於這些應用。 孟J牛符號說明 面板 第一激發器 第二激發器 -11 - 本紙張尺度適用中國國家標準(CNS) A4規格(210X 297公釐）A7 B7 sends some types of modalities; an example is the torsion exciter proposed by New Transducers in international patent number WOOO / 13 4 64, which can selectively excite certain modalities, or at least ignore the whole Modal. This torsional excitation can be achieved, for example, by placing opposing inertial exciters on both sides of the nodal line. If the exciter is located at some pitch line around the asymmetric group, or the symmetric group, this method allows the torsional excitation of the model group. It is difficult to find a suitable position to excite both asymmetric and symmetric modes at the same time, because no position can pass through a large number of node lines of asymmetric and symmetric modes simultaneously. Therefore, a method of exciting symmetrical and asymmetric modes separately is particularly suitable for torsional excitation modes using inertial exciters. Although the specific embodiment described is related to a speaker, the transducer preferentially coupled to the odd and even modes can also be applied to other distributed mode panels, such as a microphone or other sound device. In these situations' however these transductions need of course be applicable to these applications. Meng Jiu Symbol Description Panel First Exciter Second Exciter -11-This paper size applies to China National Standard (CNS) A4 (210X 297 mm)