200531567 玖、發明說明： 【發明所屬之技術領域】 本發明是有關於一種喇π八振動速度的檢測方法，特別 是指一種多音圈喇队的音膜的振動速度的檢測方法。 5 【先前技術】 10 15 喇<在不同的使用環境下使用，或是由不同的功率放 大器來驅動時’其所產生的音效表現並不相同，如果要維 持良好的音效表現，獲知喇π八表面的音膜的振動速度是报 重要的。一般獲知喇叭的振動速度的方式，一種是使用喇 口八的數學模型，其藉由喇π八的特性參數，如機械慣量、黏 滯係數和磁鐵耦合因子等來計算出喇σΛ的振動速度。 圖1中揭示了另-種利用f射都卜勒測速儀u來量測 味卜八12振動速度的方式。其方式是利用雷射都卜勒測速儀 11沿圖1中假想線發出雷射光並照射於心Λ 12的音膜13 上，並藉由反射的雷射光可得知音膜13的振動速度。 上述使用數學模型來計算心12的音膜13的振動速 度時，需先量得似12許多特性參數，然而有些特性參數 並不容易量得，而且數學模型有其適㈣寬的限制。再者 ，數學模型計算出來的振動速度與實際量測的振動速度的 值也存在有一定的誤罢。 、差而另一種使用雷射都卜勒測速儀 1曰1實際來量測制0八12的振動速度，是比效精確的方式。但 疋雷射都卜勒測速儀11的造價昂貴。所以喇幻2於使用時 乂雷射都卜勒,料儀u隨時量測切Η的 不 是一種經濟的做法。 疋又卫不 20 200531567 【發明内容】 ^本毛明之目的在於提供一種成本低、體積小、 準確度而的多音圈喇σ八的振動速度的檢測方法。 5 10 15 於是，本發明多音圈喇Β八振動速度的檢測方法包 列步驟： ^ 求侍一第一轉移函數：使用一音波壓力源的音波驅私一 多音圈似的音膜振動。同時調控—第—電壓並輸入—多 ^圈似的第-音圈，使得該音膜不振動，並量測此時: 第-音圈的第二電壓。然後以該第一和第二電壓來 第一轉移函數。 ® §亥 求侍一第二轉移函數：施以另一預設的第一電壓於該第 一音圈來驅動該音膜振動。此時，量測該音膜的振動^度 和該第二音圈的第二電壓。然後以該預設第一電壓和第： 電壓’配合上述步驟中已求得的該第-轉移函數，來求^ 該第二轉移函數。 建構-振動速度感應裝置：由上述步驟得出的一斑 第二轉移函數，及-料的計算邏輯，建構該振動速度感 當該多音圈t八使用時，輸入該多音圈剩口八的第一與 第二電壓於該振動速度感應裝置而得出該多音㈣队於使 用時，其音膜的振動速度。 【實施方式】 、有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之—較佳實施例的詳細說明中，將可清 20 200531567 楚的明白。200531567 (1) Description of the invention: [Technical field to which the invention belongs] The present invention relates to a method for detecting the vibration speed of π π, especially to a method for detecting the vibration speed of the sound film of a multi-voice coil. 5 [Prior art] 10 15 Ra < When used in different environments or driven by different power amplifiers, 'the sound performance produced by them is not the same. If you want to maintain good sound performance, you know The vibration speed of the eight-surface sound film is important. Generally, one way to obtain the vibration speed of the horn is to use a mathematical model of Lakouba, which uses Lapiba's characteristic parameters, such as mechanical inertia, viscosity coefficient, and magnet coupling factor, to calculate the vibration speed of LaσΛ. Fig. 1 discloses another way to measure the vibration speed of Weibu Ba12 by using the f-dubbler velocimeter u. The method is to use a laser Doppler velocimeter 11 to emit laser light along an imaginary line in FIG. 1 and irradiate the sound film 13 of the heart Λ 12, and the vibration speed of the sound film 13 can be obtained by the reflected laser light. When the mathematical model is used to calculate the vibration speed of the sound film 13 of the heart 12, many characteristic parameters like 12 need to be measured first. However, some characteristic parameters are not easy to measure, and the mathematical model has its wide limits. In addition, there are some errors between the calculated vibration speed of the mathematical model and the actual measured vibration speed. , Poor and the other is to use the laser Doppler velocimeter 1 to 1 to actually measure the vibration speed of 0-812, is a more accurate way. However, the laser doppler velocimeter 11 is expensive to manufacture. Therefore, it is not an economical method to use Lai 2 to measure laser cutting at any time.疋 又 卫 不 20 200531567 [Summary of the Invention] The purpose of the present invention is to provide a method for detecting the vibration velocity of a multi-voice coil σσ with low cost, small size and accuracy. 5 10 15 Therefore, the method for detecting the vibration speed of the multi-voice coil Β8 of the present invention includes the following steps: ^ Ask for a first transfer function: use a sound wave of a sonic pressure source to drive a multi-voice coil-like sound film vibration. At the same time, the -th voltage is input and the -th voice coil of multiple ^ turns is input, so that the sound film does not vibrate, and the second voltage of the -voice coil is measured at this time. The first and second voltages are then used to first transfer the function. ® §Hai Seeking a second transfer function: applying another preset first voltage to the first voice coil to drive the sound film to vibrate. At this time, the vibration degree of the sound film and the second voltage of the second voice coil are measured. Then, the preset first voltage and the first voltage: are used in conjunction with the first-transfer function that has been obtained in the above steps to find the second transfer function. Construction of a vibration speed sensing device: a second transfer function obtained from the above steps and calculation logic of the material to construct the vibration speed feeling. When the multi-voice coil t eight is used, input the remaining number of the multi-voice coil eight. The first and second voltages are obtained from the vibration speed sensing device to obtain the vibration speed of the sound film of the multi-tone squadron when in use. [Embodiment] The foregoing and other technical contents, features, and effects of the present invention will be clearly understood in the following detailed description of the preferred embodiment with reference to the drawings.
一立參閱® 2，-般的雙音圈，八2具有―永久磁鐵I 一：=22、一第一音圈23，和—第二音圈24。如分別對第 一和弟二音圈23、24輸入第一和第- 弟一電M以⑴、h⑴，可 音圈23、24產生磁場，並配合永久磁鐵2卜 來使第一和第二音圈23、2 移動’進而驅動音膜22振動 而產生音波。 ίο 15 θ發明多音圈伽γ振動速度的檢測方法之較佳實施例 是：上述雙音圈喇叭2的第一音圈23輸入一隨時間而變的 第一電壓Mt)，並由第二音圈24中感應的第二電壓〇⑴， 再-σ 乂頻域定義的第一與第二轉移函數Gi(s)、G2(s)來得 知雙9圈喇Π八2音膜22的振動速度。 "參閱圖3和圖4，步驟301至步驟3〇4是求得第一轉移 'i(s)的歷程。首先，步驟3〇1是於一中空圓柱形的聲 音導管4(ac〇ustic duct)的一端設置一音波壓力源$。且於聲 音導管4的側壁上開設有一穿孔41，並藉此穿孔41連接上 述之雙音圈味卜八2。湘-訊號產生器、61纟生電壓訊號並 同時輸入音波壓力源5及訊號控制器62。於是，音波壓力 源5被驅動而產生音波，且音波於聲音導管4中傳播並經 穿孔41後驅動雙音圈喇,八2的音膜22(見圖2)振動。 接著’步驟302是藉由雷射都卜勒測速儀63來量測雙 音圈剩< 2音膜22的振動速度Vlaser a(t)，並將此振動速度 Vlaser—a⑴報告給訊號控制器62,使訊號控制器62得以調控 由訊號產生器61產生電壓訊號而改變對雙音圈喇0八2輸入 20 200531567 的第一電壓ei⑴沾 叙…、目， 並使雙音圈喇叭2的音膜22不振 動，即使夏測到的脖& ^ a 仲入楚-ra user-a⑴的值恆為零。此時，記 錄輸入第一音圈2V s m t & 生器64巾。 圖2)的第一電壓La⑴於轉移函數產 步驟303是於音 24(見圖2)中感應的第 膜22不振動時，量測並記錄第二音圈 一電壓e2_a⑴於轉移函數產生器64中 ' 疋由轉移函數產生器64將步驟302和步驟 303.中分別得到的第一電s ei a⑴與第二電壓、⑴，經傅 10 Α葉轉換成為頻域定義的第-電壓Ela(s)與第二電壓 E2_a(S) ’並代人_式⑴中而求得第-轉移函數Gl(s)。 Gl(s)=-[E2_a(s)/El a(s)] m >閱圖3和圖5，接下來的步驟311至步驟314是求得 第二轉移函數G2(s)的歷程4驟311是利用訊號產生器61 15 I生預設的電壓訊號並輸人至訊號控制器、62。接著訊號控 制器62將此電壓訊號調整放大以符合雙音圈喇叭2適用的 輸入功率，以預設的第一電壓e丨_b⑴輸入至雙音圈喇叭2以 驅動音膜22(見圖2)振動並產生音波。同時，由轉移函數產 生器64記錄預設的第一電壓ei b(t)。 〇 接著，步驟312是藉由雷射都卜勒測速儀03來量測雙 曰圈喇叭2音膜22的振動速度Vlaser b⑴，並將此振動速度Yi Li See® 2, a double voice coil, 8 has-a permanent magnet I-= 22, a first voice coil 23, and-a second voice coil 24. For example, if the first and second voice coils 23 and 24 are input to the first and second voice coils 23 and 24 respectively, the first and second coils M and ⑴ can be used to generate a magnetic field, and cooperate with the permanent magnet 2 to make the first and second coils The voice coils 23 and 2 are moved, and the sound film 22 is driven to vibrate to generate sound waves. ίο A preferred embodiment of a method for detecting the gamma-gamma vibration velocity of a multi-voice coil invented by 15 θ is: the first voice coil 23 of the dual voice coil horn 2 inputs a first voltage Mt that changes with time, and The second voltage induced in the voice coil 24 is ⑴, and the first and second transfer functions Gi (s) and G2 (s) defined in the frequency domain of -σ 得 are used to learn the vibration of the double 9-turn La Π 8 2 sound film 22 speed. " Referring to FIG. 3 and FIG. 4, steps 301 to 304 are the processes of obtaining the first transition 'i (s). First, in step 301, an acoustic pressure source $ is set at one end of a hollow cylindrical acoustic duct 4 (acoustic duct). A perforation 41 is provided on the side wall of the sound pipe 4, and the perforation 41 is used to connect the dual voice coil taste bud 8 2 described above. The Xiang-signal generator, 61 generates a voltage signal and inputs the sonic pressure source 5 and the signal controller 62 at the same time. Thus, the sonic pressure source 5 is driven to generate a sound wave, and the sound wave propagates through the sound duct 4 and passes through the perforation 41 to drive the double voice coil 8 and the sound film 22 (see Fig. 2) of 2 to vibrate. Next, step 302 is to measure the vibration speed Vlaser a (t) of the dual voice coil < 2 sound film 22 by the laser Doppler velocimeter 63 and report the vibration speed Vlaser-a⑴ to the signal controller. 62, so that the signal controller 62 can regulate the voltage signal generated by the signal generator 61 to change the first voltage ei⑴ input to the double voice coil 0 8 2 20 200531567, and make the sound of the double voice coil speaker 2 The membrane 22 does not vibrate, even though the value of the neck & ^ a zhong a chu-ra user-a⑴ measured by Xia is always zero. At this time, record the first voice coil 2V sm t & 64 towel. The first voltage La in the transfer function is generated in step 303. When the second film 22 induced in the sound 24 (see FIG. 2) is not vibrating, the second voice coil voltage e2_a is measured and recorded in the transfer function generator 64. The '疋 is converted by the transfer function generator 64 from the first electric s ei a⑴ and the second voltage, ⑴ obtained in step 302 and step 303. into the first voltage Ela (s ) And the second voltage E2_a (S) 'and substitute it in Equation _ to obtain the first transfer function Gl (s). Gl (s) =-[E2_a (s) / El a (s)] m > See FIG. 3 and FIG. 5, the next steps 311 to 314 are the processes of obtaining the second transfer function G2 (s) 4 Step 311 is to use a signal generator 61 15 to generate a preset voltage signal and input it to the signal controller 62. Then the signal controller 62 adjusts and amplifies this voltage signal to comply with the applicable input power of the dual voice coil speaker 2, and inputs the preset first voltage e 丨 _b⑴ to the dual voice coil speaker 2 to drive the sound film 22 (see FIG. 2). ) Vibrates and generates sound waves. At the same time, the preset first voltage ei b (t) is recorded by the transfer function generator 64. 〇 Next, step 312 is to measure the vibration speed Vlaser b⑴ of the double-horn speaker 2 sound film 22 by the laser Doppler velocimeter 03, and then the vibration speed
Vlaser-b⑴報告給轉移函數產生器64。同時，步驟313是測得 '己錄第_音圈24中感應的第二電壓e2 b⑴於轉移函數產 生器64。 200531567 ッ驟314収將步驟312、313巾分別得到的第一電壓 :_b⑴和振動速度Viaser—“t)，分別經傅立葉轉換成為頻域定 Λ的第電壓El-b(s)和振動速度Us)。再配合步驟304 二⑽竭式(2)刚 E2i_b(s)=E2 b(s)+Gl(s)E1_b(s) ⑺ G2(s)=Vlaser_b(s)/E21_b(s) ίο 15 至此，已經得到雙音圈喇叭2的第一與第二轉移：丄 1(s)、G2(s)。接下來的步驟320是利用分別在步驟3〇4和 =叫求得的第—與第二轉移函數仏⑷、G2⑷來建構雙 S圈喇°八2的振動速度感應裝置7(見圖ό)。 參閱圖6,振動速度感應裝置7中具有一運算單元71 和-儲存單元72。儲存單元72儲存有二分別屬於上述雙音 圈骸2且内建的第一轉移函數^⑷與第二轉移函數邮曰） 。當雙音圈，卜八2使用時，同時使第-電壓ei⑴和第二電 麼，輸入振動速度感應裝置7的運算單元71。運算單元 71會將第-電壓ei⑴和第二„ e2⑴進行傅立葉轉 相率定義的第-電壓El⑷和第二„E2(s)，且讀取儲存 早元72中内建的第一與第二轉移函數Gl(S)、G2(S)，並執 仃如關係式⑷所示的特定的運算邏輯，而得出以頻率定義 的雙音’ 2的振動速度v(s)。接著，進行反傅 換將此振動速度V(s)轉㈣為時域定義的振動速度v⑴來輪 V(s)=G2(s)[E2(s)+G1(s)E1(s)] (4) 20 因此，廠商可利用上述之步驟來求出各式樣或不 5 10 15 20 ^測得的振動速度vlaser(t)，在310Hz㈣率中，兩種方式 得到振動速度V(t)、Vlaser⑴是近乎一致的。 200531567 牌的雙音圈心2的第一與第二轉移函數Μ)%⑷，: 且事先内建至振動速度感應裝置7中，即可單獨出售或與 雙音圈2搭售。“需特別說明的是，雖本實施例使 用的是雙音圈似2來教隸動速度的檢财法，但對於 具有等於或大於二音圈數目的心，皆可適用本發明之檢 測方法。再者，振動速度感應裝£ 7是可為—完整獨立的 檢測儀器、電路元件，或為資訊軟體的物件。 圖7顯示了雙音圈喇叭2(見W 6)於使用時，利用振動 速度感縣置7算得的振動速度v⑴，與雷射都卜勒測速儀 歸納上述，本發明《多音圈t八振動速度的檢測方法 是利用了雙音圈喇叭2的第一和第二電壓ei⑴、e2⑴，與二 能表現雙音圈喇、2特性的第一與第二轉移函數Gi(s)、 G2(s) ’來求得雙音圈伽γ 2音膜22的振動速度v⑴。因此 ’並不需要每次都藉由雷射都卜勒測速儀η來實際量測振 動速度vlaser(t)，就可達到與雷射都卜勒測速儀u相同精確 度’故確實能達到本發明之目的。 惟以上所述者，僅為本發明多音圈喇^八振動速度的檢 測方法之較佳實施例而已，當不能以此限定本發明實施之 範圍，即大凡依本發明申請專利範圍及發明說明書内容所 作之簡單的等效變化與修飾，皆應仍屬本發明專利涵蓋之 範圍内。 10 200531567 【圖式簡單說明】 圖1是一習知以一雷射都卜勒測速儀來測量喇α八音膜 振動速度的示意圖； 圖2是本發明的多音圈喇°八振動速度的檢測方法的一 較佳實施例中，一雙音圈喇叭的構造示意圖； 圖3是該較佳實施例中，求得一第一轉移函數、求得 一第二轉移函數，和建構一振動速度感應裝置的步驟的方 塊圖； 圖4是該較佳實施例中，求得該第一轉移函數的示意 圖說明一汛號控制器藉由輸入一第一電壓來調控該雙音 圈喇叭不致振動時，一轉移函數產生器接收記錄一第二電 壓，並求出該第一轉移函數的系統； 圖5是該較佳實施例中，求得該第二轉移函數的示意 圖，說明以另一預設第一電壓來驅動該雙音圈喇叭時，該 轉移函數產生器分別接收記錄相對應該預設第一電壓的第 二電壓和一以該雷射都卜勒測速儀測得的振動速度，並配 合已知的該第一轉移函數來求得該第二轉移函數的系統； 圖6是一建構並利用該振動速度感應裝置得出該雙音 圈喇°八振動速度的示意圖；及 曰 圖7是一圖表，說明了雙音圈喇„八於31〇Ηζ的頻率中 ’利用振動速度感應裝置與雷㈣卜勒測速儀分別得 振動速度，是近乎一致的。 200531567 【囷式之主要元件代表符號說明】 11 雷射都卜勒測速儀 4 聲音導管 12 口刺队 41 穿孔 13 音膜 5 音波壓力源 2 雙音圈味]A 61 訊號產生器 21 永久磁鐵 62 訊號控制器 22 音膜 63 雷射都卜勒測速儀 23 第一音圈 64 轉移函數產生器 24 第二音圈 7 振動速度感應裝置 301 〜304步驟 71 運算單元 311' 〜3 14步驟 72 儲存單元 320 步驟 12Vlaser-b⑴ reports to the transfer function generator 64. At the same time, step 313 is to measure the second voltage e2 b induced in the recorded voice coil 24 in the transfer function generator 64. 200531567 Step 314 receives the first voltages obtained in steps 312 and 313, respectively: _b⑴ and the vibration velocity Viaser— "t), which are transformed into the first voltage El-b (s) and the vibration velocity Us, which are fixed in the frequency domain by Fourier transform. ). Then cooperate with step 304. Two depletion formula (2) E2i_b (s) = E2 b (s) + Gl (s) E1_b (s) ⑺ G2 (s) = Vlaser_b (s) / E21_b (s) ίο 15 So far, the first and second transfers of the dual voice coil horn 2 have been obtained: 丄 1 (s), G2 (s). The next step 320 is to use the first and The second transfer functions 仏 ⑷ and G2⑷ are used to construct a double S-circle vibration speed sensing device 7 (see FIG. 6). Referring to FIG. 6, the vibration speed sensing device 7 has an operation unit 71 and a storage unit 72. The storage unit 72 stores two built-in first transfer functions ^ ⑷ and second transfer functions respectively belonging to the above-mentioned double voice coil skeleton 2). When the double voice coil, Bu Ba 2 is used, the -voltage ei⑴ And the second power, input to the arithmetic unit 71 of the vibration speed sensing device 7. The arithmetic unit 71 performs the -th voltage El⑷ defined by the Fourier phase conversion rate of the -th voltage ei⑴ and the second „e2⑴. The second "E2 (s)" reads and stores the first and second transfer functions Gl (S), G2 (S) built in the early element 72, and executes the specific operation logic shown in the relation ⑷ , And the vibration velocity v (s) of the double tone '2 defined by the frequency is obtained. Then, the inverse Fourier transform is performed to convert the vibration velocity V (s) to the vibration velocity v⑴ defined in the time domain to round V (s). = G2 (s) [E2 (s) + G1 (s) E1 (s)] (4) 20 Therefore, manufacturers can use the above steps to find various specifications or not 5 10 15 20 ^ Measured vibration speed vlaser (t), in 310Hz㈣ rate, the two methods to obtain the vibration speed V (t), Vlaser⑴ are almost the same. 200531567 The first and second transfer function M)% of the dual voice coil core 2 of the brand: Built into the vibration speed sensing device 7, it can be sold separately or tied with the dual voice coil 2. "It is important to note that although this embodiment uses a dual voice coil like 2 to teach the control of the speed of the slave Method, but for the heart with the number of voice coils equal to or greater than two, the detection method of the present invention can be applied. Furthermore, the vibration speed sensing device £ 7 can be used as a complete stand-alone testing instrument, circuit element, or information software object. Figure 7 shows the dual voice coil horn 2 (see W 6) in use, the vibration velocity v 速度 calculated by using the vibration speed sensor 7 and the laser Doppler velocimeter to summarize the above, the present invention "multi voice coil t eight The method of detecting the vibration speed is to use the first and second voltages ei⑴ and e2⑴ of the dual voice coil horn 2 and the first and second transfer functions Gi (s), G2 ( s) 'to obtain the vibration speed v⑴ of the dual voice coil gamma γ 2 sound film 22. Therefore, 'It is not necessary to actually measure the vibration velocity vlaser (t) with the laser doppler velocimeter η every time, it can reach the same accuracy as the laser doppler velocimeter u', so it can indeed reach this cost. The purpose of the invention. However, the above is only a preferred embodiment of the method for detecting the multi-voice coil vibration speed of the present invention. When the scope of implementation of the present invention cannot be limited by this, that is, the scope of the patent application and the description of the invention according to the present invention The simple equivalent changes and modifications made to the content should still fall within the scope of the patent of the present invention. 10 200531567 [Schematic description] Figure 1 is a schematic diagram of a conventional La Doppler speed measurement using a laser Doppler velocimeter; Figure 2 is a multi-voice coil La ° eight vibration velocity of the present invention In a preferred embodiment of the detection method, a schematic diagram of the structure of a dual voice coil horn; FIG. 3 is a first transfer function, a second transfer function, and a vibration velocity in the preferred embodiment A block diagram of the steps of the induction device. Figure 4 is a schematic diagram of the first transfer function in the preferred embodiment. When a flood number controller inputs a first voltage to regulate the dual voice coil horn to prevent vibration, A transfer function generator receives and records a second voltage and obtains the first transfer function. FIG. 5 is a schematic diagram of obtaining the second transfer function in the preferred embodiment, and illustrates another preset When driving the dual voice coil horn with a first voltage, the transfer function generator receives and records the second voltage corresponding to the preset first voltage and a vibration velocity measured by the laser Doppler velocimeter, and cooperates with Known the A transfer function to obtain the system of the second transfer function; FIG. 6 is a schematic diagram of constructing and using the vibration speed sensing device to obtain the dual voice coil La ° eight vibration velocity; and FIG. 7 is a graph illustrating The two voice coils „in the frequency of eighty three tenths of a square 'use the vibration speed sensing device and the Leibolder velocimeter to obtain vibration speeds, which are almost the same. 200531567 [Description of the main symbols of the main formula] 11 Laser Doppler velocimeter 4 sound tube 12 stinger 41 perforation 13 sound film 5 sonic pressure source 2 dual voice coil flavor] A 61 signal generator 21 permanent magnet 62 signal controller 22 sound film 63 laser doppler speedometer 23 First voice coil 64 Transfer function generator 24 Second voice coil 7 Vibration speed sensing device 301 to 304 step 71 Operation unit 311 'to 3 14 step 72 Storage unit 320 step 12