A7 B7 4 23 210 灸 55 10twf.doc/〇〇8 五、發明說明（/ ) 本發明是有關於一種主動噪音控制電路，且特別是有 關於一種反饋式主動噪音控制電路。 傳統在噪音防治的方法上，多是採用噪音防治耳罩。 而噪音防治耳罩依據其防噪的方法，可分爲兩種：被動噪 音防治耳罩’以及主動噪音控制耳罩。在被動噪音防治耳 罩方面’由於只是單純的依賴隔聲材料來阻絕外界的噪 音’所以抗噪音的能力就與所使用的材料厚度有極度的相 關’因此’若要達到有效的降噪功能，所使用的耳罩都是 大型且厚重的。另外，使用在被動噪音防治耳罩上的材料， 對於低頻的噪音幾乎沒有阻隔的能力，因此，對於類似引 擎’鼓風機之類的低頻噪音，就幾乎沒有噪音防治的效果。 反之，主動噪音控制耳罩就沒有上述的限制。主動噪 音控制耳罩的功能就與重量之間沒有直接的關係，而且對 於低頻的噪音也特別有效。 目前使用的主動噪音控制耳罩，可以根據電路控制方 法分爲兩種：前饋式與反饋式。前饋式電路的優點是結構 簡單，所以所需的體積較小；但是前饋式電路的控制性能 不佳，降噪音的效果也不明顯，甚至在中高頻段（l.5KHz 以上）的時候，還會增加噪音的等級，完全違反了噪音控制 的目標。 而反饋式電路的優點則是主動降矂的能力強，但是由 於目前所使用之反饋式噪音控制電路的電路複雜，所以無 法有效的將電路小型化，例如：NCTI的NoiseBuster，就 使用了 20個以上的運算放大器。而由於電路的複雜，因此 (請先閱讀背面之注意事|^填窝本頁) "丨裝 訂·- 經濟部智慧財產局員工消費合作杜印製 本紙張尺度適用中國國家標準（CNS)A4規格（210 297公茇) 4 2 3 21 Ο Α7 55 1 〇twf.doc/0〇8 Β7 五、發明說明（>) 通常必須將整個耳罩分爲兩個部分，也就是控制電路以及 耳機。若是要將反饋式電路整合到耳機中，就會造成大而 厚重的產品’例如NCTI的PA3000型工業安全級別的產 品。 綜上所述，習知對噪音控制耳罩的處理方法有許多缺 點，現列述如下： 1. 被動式噪音防治耳罩對於噪音的防治效果差； 2. 使用前饋式電路進行噪音控制，其控制性能不佳， 降矂效果不明顯，甚至在中高頻段中還會增加噪音的等 級；以及 3. 使用反饋式電路進行噪音控制，電路複雜，因此通 常將整個耳罩分爲控制電路以及耳機兩個部分，其保管不 易，而若將控制電路及耳機整合在一起，會導致耳機變大 且變得更爲厚重。 有鑒於此’本發明提出一種反饋式主動噪音控制電 路，其使用簡單的電路，運用相對於習知而言極少的運算 放大器，達到以反饋式電路來控制噪音的效果。 本發明提出一種反饋式主動噪音控制電路，包括一個 運作電源，一個運算放大器，一個音源輸入器，複數個可 變電阻，複數個被動元件以及複數個電容。其中，運作電 源提供電路運作所需的電力。而蓮算放大器則具有一個運 算訊號輸入正端，一個運算訊號輸入負端，一個運算放大 器電壓正端，一個運算放大器電壓負端以及一個放大器輸 出端。而音源輸入器則包括了—個音源正端以及一個音源 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公楚） A7 B7 4 23 21 0 55 10twf.doc/008 五、發明說明（>) 負端。 此外，這些被動元件分別具有一個被動甲端以及被動 乙端；這些可變電阻則分別具有一個電阻甲端，—個電阻 乙端以及一個電阻接出端。而這些電容則分別具有一個電 容甲端以及一個電容乙端。 而在本發明的一個實施例中，經由此反饋式主動噪音 控制電路而產生的噪音控制訊號會輸入於一個功率放大器 中’再經由此功率放大器將訊號放大而加以輸出。 本發明另外提出一種反饋式主動噪音控制電路，包括 一個運作電源’一個噪音控制電路，一個突波防止電路以 及一個功率放大器。其中，運作電源提供電路運作所需的 電力；噪音控制電路具有一個音源輸入器，四個運算放大 器，一個噪音控制訊號輸出端以及一個噪音控制電壓接 點。而突波防止電路具有一個防止突波電路運作電源輸入 端，與一個防止突波電路運作電源輸出端。此外，功率放 大器則具有一個功率放大器電壓正端，一個功率放大器電 壓負端，一個功率訊號輸入端以及一個功率訊號輸出端。 其中，噪音控制訊號輸出端電性耦接於功率訊號輸入 端；而噪音控制電壓接點則電性耦接於防止突波電路運作 電源輸入端，且此噪音控制電壓接點以及此防止突波電路 運作電源輸入端都電性耦接於運作電源的正端。另外，防 止突波電路運作電源輸出端則電性耦接於功率放大器電壓 正端；而功率放大器電壓負端則接地，且以功率訊號輸出 端的訊號做爲此反饋式主動噪音控制電路的輸出。 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (諳先閱讀背面之注意事項再填寫木頁) 裝 訂 經濟部智慧財產局員工消費合作社印製 Α7 B7 Ο 5510twf.doc/008 五、發明說明（4 ) 此外，在本發明的一個實施例中，還包括了一個原始 發聲音源輸入器，其具有一個音樂輸入正端以及一個音樂 輸入負端。這個原始發聲音源輸入器用以接納由一個發聲 裝置所發出的聲音，而這個發聲裝置所發出的聲音則是希 望不因本發明而被消減的聲音。透過將這兩個音樂輸入正 端以及音樂輸入負端電性耦接到本發明的電路中，除了可 以對噪音產生控制以外，也可以將由上述之發聲裝置所發 出的聲音加以補償，而得到更完美的音質。 綜上所述，本發明使用簡單的電路，運用相對於習知 而言極少的運算放大器（一個或四個運算放大器），達到以 反饋式電路來控制噪音的效果。除此之外，本發明並且考 慮到必須將原本希望保留的聲音留住，而不會因爲控制噪 音而導致這些聲音的消失，所以特別將這些聲音的訊號引 進本發明的電路中，藉由同〜個電路對這些聲音加以補 償，使得音質更好。 爲讓本發明之上述和其他目的、特徵、和優點能更明 顯易懂’下文特舉較佳實施例，並配合所附圖式，作詳細 說明如下： 圖式之簡單說明： 第1A-1B圖所繪示的是根據本發明之一較佳實施例的 電路連接圖； 第2圖繪7K的是婦賴岐—雛麵麵電路連 接方塊示意圖；以及 第3A-3D圖所繪不的是根據本發明之一較佳 (請先閱讀背面之注意事項再填寫本頁) ;裝 · 經濟部智慧財產局員工消費合作社印製 6 本紙張尺度適用t國國家標準（CNS)A4規格（210 X 297公 A7 B7 23 210 55 10twf,doc/008 五、發明說明（e ) 電路連接圖。 重要元件標號 9，52，98 :運作電源 10，60 :音源輸入器 12，94，95，96，97 :運算放大器 14，16，18，20，22，24，26，28，30，32 :被動元件 34，40，73 :可變電阻 36，38，44，63，65，67，69 :電容 42 :功率放大器 46 :擴音器 50 :噪音控制電路 54 :突波防止電路 56，71 :功率放大器 58，75 :擴音器 62 ， 64 ， 66 ， 68 ， 70 ， 72 ， 74 ， 76 ， 78 ， 80 ， 81 ， 82 ， 83 ， 84，85，86，87，88，89，90 :被動元件 經濟部智慧財產局員工消費合作社印製 77 :原始發聲音源輸入器 92 :電晶體 較佳實施例A7 B7 4 23 210 Moxibustion 55 10twf.doc / 〇〇8 V. Description of the invention (/) The present invention relates to an active noise control circuit, and in particular to a feedback type active noise control circuit. In traditional noise prevention methods, noise prevention earmuffs are mostly used. The noise prevention earmuffs can be divided into two types according to their noise prevention methods: passive noise prevention earmuffs' and active noise control earmuffs. In terms of passive noise prevention earmuffs, 'Because it simply relies on sound insulation materials to block external noise', the ability to resist noise is extremely related to the thickness of the material used. 'So' To achieve an effective noise reduction function, The earcups used are large and heavy. In addition, the materials used in passive noise prevention earmuffs have almost no ability to block low-frequency noise. Therefore, for low-frequency noise such as an engine 'blower, there is almost no noise prevention effect. Conversely, active noise control ear cups do not have the aforementioned limitations. The function of active noise control earcups is not directly related to weight, and is especially effective for low frequency noise. Active noise control ear cups currently used can be divided into two types according to circuit control methods: feed-forward and feedback. The advantage of the feedforward circuit is that the structure is simple, so the required volume is small; but the control performance of the feedforward circuit is not good, and the effect of reducing noise is not obvious, even in the middle and high frequency band (above 1.5KHz) It will also increase the noise level, completely violating the goal of noise control. The advantage of the feedback circuit is that it has a strong ability to actively reduce the noise. However, because the feedback noise control circuit currently used is complicated, it is not possible to effectively miniaturize the circuit. For example, NCTI ’s NoiseBuster uses 20 The above operational amplifier. And because of the complexity of the circuit, please read the notes on the back | Specifications (210 297 male) 4 2 3 21 〇 Α7 55 1 〇twf.doc / 0〇8 Β7 V. Description of the invention (>) Generally, the entire earmuff must be divided into two parts, that is, the control circuit and the earphone . If the feedback circuit is to be integrated into the headset, it will result in a large and heavy product 'such as NCTI's PA3000 industrial safety level product. In summary, there are many shortcomings in the conventional method of noise control earmuffs, which are listed as follows: 1. The passive noise prevention earmuffs have a poor effect on noise prevention; 2. The feedforward circuit is used for noise control. Poor control performance, low noise reduction effect, and increased noise levels even in mid-to-high frequency bands; and 3. Using feedback circuit for noise control, the circuit is complicated, so the entire earmuffs are usually divided into control circuits and headphones The two parts are not easy to keep, and if the control circuit and the headset are integrated together, the headset will become larger and heavier. In view of this, the present invention proposes a feedback-type active noise control circuit, which uses a simple circuit and uses very few operational amplifiers compared with the conventional one to achieve the effect of controlling noise with a feedback-type circuit. The invention proposes a feedback-type active noise control circuit, which includes an operating power source, an operational amplifier, a sound source input device, a plurality of variable resistors, a plurality of passive components, and a plurality of capacitors. Among them, the operating power supply provides the power required for the operation of the circuit. The lotus computing amplifier has a positive input terminal for operational signals, a negative input terminal for operational signals, a positive terminal for operational amplifier voltage, a negative terminal for operational amplifier voltage, and an amplifier output terminal. The sound source input device includes a sound source positive end and a sound source. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297). A7 B7 4 23 21 0 55 10twf.doc / 008 5. Description of the invention (≫) Negative end. In addition, these passive components have a passive A terminal and a passive B terminal, respectively; these variable resistors have a resistive A terminal, a resistive B terminal and a resistive output terminal, respectively. These capacitors each have a capacitor A terminal and a capacitor B terminal. In one embodiment of the present invention, the noise control signal generated by the feedback-type active noise control circuit is input into a power amplifier, and then the signal is amplified by the power amplifier and output. The present invention further provides a feedback-type active noise control circuit, which includes an operating power source, a noise control circuit, a surge prevention circuit, and a power amplifier. Among them, the operating power supply provides the power required for the operation of the circuit; the noise control circuit has a sound source input, four operational amplifiers, a noise control signal output terminal and a noise control voltage contact. The surge prevention circuit has a power input terminal for preventing the surge circuit from operating and a power output terminal for preventing the surge circuit from operating. In addition, the power amplifier has a power amplifier voltage positive terminal, a power amplifier voltage negative terminal, a power signal input terminal and a power signal output terminal. Among them, the noise control signal output terminal is electrically coupled to the power signal input terminal; and the noise control voltage contact is electrically coupled to the power supply input terminal of the surge prevention circuit, and the noise control voltage contact and the surge prevention The input terminals of the operating power of the circuit are electrically coupled to the positive terminal of the operating power. In addition, the output end of the surge protection circuit is electrically coupled to the positive terminal of the power amplifier voltage; the negative terminal of the power amplifier voltage is grounded, and the signal from the power signal output terminal is used as the output of this feedback active noise control circuit. This paper size is in accordance with Chinese National Standard (CNS) A4 (210 X 297 mm) (谙 Please read the notes on the back before filling in the wood pages) Binding Printed by the Intellectual Property Bureau Staff Consumer Cooperative of the Ministry of Economic Affairs Α7 B7 Ο 5510twf.doc / 008 V. Description of the invention (4) In addition, in an embodiment of the present invention, an original sound source input device is further provided, which has a positive music input terminal and a negative music input terminal. The original sound source input device is used to receive a sound made by a sound device, and the sound made by the sound device is a sound that is not expected to be reduced by the present invention. By electrically coupling the two positive ends of the music input and the negative end of the music input to the circuit of the present invention, in addition to controlling the noise generation, the sound emitted by the above-mentioned sound emitting device can also be compensated to obtain more Perfect sound quality. To sum up, the present invention uses a simple circuit and uses very few operational amplifiers (one or four operational amplifiers) compared to the conventional one to achieve the effect of controlling noise with a feedback circuit. In addition, the present invention also considers that it is necessary to retain the sounds that were originally intended to be retained without causing them to disappear due to noise control. Therefore, the signals of these sounds are specifically introduced into the circuit of the present invention. ~ Circuits compensate for these sounds, making the sound quality better. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the following describes the preferred embodiments in detail with the accompanying drawings as follows: Brief description of the drawings: Sections 1A-1B The drawing shows a circuit connection diagram according to a preferred embodiment of the present invention; FIG. 2 shows 7K is a schematic diagram of the Fulaiqi-Hinai circuit connection block; and FIG. 3A-3D does not show It is better according to one of the present invention (please read the precautions on the back before filling out this page); installed · printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economy 6 This paper size is applicable to the national standard (CNS) A4 specification (210 X 297 male A7 B7 23 210 55 10twf, doc / 008 V. Description of the invention (e) Circuit connection diagram. Important component numbers 9, 52, 98: Operating power supply 10, 60: Sound source input devices 12, 94, 95, 96, 97 : Operational amplifiers 14, 16, 18, 20, 22, 24, 26, 28, 30, 32: Passive components 34, 40, 73: Variable resistors 36, 38, 44, 63, 65, 67, 69: Capacitor 42 : Power amplifier 46: Loudspeaker 50: Noise control circuit 54: Surge prevention circuit 56, 71: Power amplification 58, 75: loudspeakers 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90: passive component economy Printed by the Ministry of Intellectual Property Bureau's Consumer Cooperatives 77: Original sound source input device 92: Transistor preferred embodiment
請同時參照第1A-1B圖，其繪示的是依照本發明一較 佳實施例的一種電路圖，其中包括了運作電源9，音源輸 入器10，功率放大器42，運算放大器12，複數個被動元 件，複數個可變電阻以及複數個電容。且第1A圖中的a 點與第1B圖中的a點電性耦接，第1A圖中的b點與第1B 本紙張尺度適用中國國家標準（CNS)A4規格（210x 297公釐） 42321 0 55l〇twf.doc/008 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明說明（4 ) 圖中的b點電性耦接，第1A圖中的c點與第1B圖中的c 點電性耦接，第1A圖中的d點與第圖中的d點電性耦 接，第1A圖中的e點與第1B圖中的e點電性耦接。 其中，音源輸入器10的一端104(即音源負端)接地，音 源輸入器10的一端106(即音源正端）則分別電性耦接於電 容36的一端362(即第一電容甲端）以及被動元件32的一端 322(即第十被動乙端）。此外，被動元件32的一端W4(即第 十被動甲端）則分別電性耦接於可變電阻34的一端342(即 第一電阻甲端），功率放大器42的一端424(即功率放大器電 壓正端）以及運算放大器12的一端128(即運算放大器電壓 正端）。且其中，被動元件32的一端324，可變電阻34的一 端342，功率放大器42的一端424以及運算放大器12的一端 128，都電性耦接至運作電源9的正端。 此外，電容36的一端364(即第一電容乙端)則分別電性 稱接於被動元件14的一端144(即第一被動甲端），被動元件 18的一端184(即第三被動甲端）以及被動元件22的一端 222(即第五被動甲端）。而被動元件14的一端142(即第一被 動乙端）則分別電性耦接於被動元件16的一端16 4 (即第二 被動乙端）以及運算放大器12的一端122(即運算訊號輸入 正端）。 另外，被動元件22的一端224(即第五被動乙端)分別電 性耦接於被動元件的一端262(即第七被動乙端），被動元 件28的一端284(即第八被動甲端）以及被動元件30的一端 304(即第九被動甲端）。而被動元件18的一端182(即第三被 8 (請先閱讀背面之注意事項疼填寫本頁) •___裝 項"^寫· LSJ. if 本紙張尺度適用中國國家標準（CNS)A4規格（210 χ 297公釐） A7 4 2 3210 551〇twf,doc/008 B7 五、發明說明（） 動乙端），則分別電性耦接於被動元件20的一端202(即第四 被動乙端），被動元件28的一端282(即第八被動乙端）’被動 元件24的一瑞244(即第六被動甲端）以及運算放大器12的 一端124(即運算訊號輸入負端）。 除此之外，可變電阻34的一端344(即第一電阻乙端) 接地，且可變電阻34的一端346(即第一電阻接出端)分別電 性耦接於被動元件16的一端162(即第二被動甲端），被動元 件20的一端204(即第四被動甲端）以及被動元件26的一端 264(即第七被動甲端）。而運算放大器12的一端126(即放大 器輸出端），則分別電性耦接於被動元件24的一端242(即第 六被動乙端），被動元件30的一端3〇2(即第九被動乙端）以 及電容38的一端382(即第二電容甲端）。 最後，電容38的一端384(即第二電容乙端）電性耦接於 可變電阻4〇的一端4〇2(即第二電阻甲端），且可變電阻4〇的 一端404(即第二電阻乙端），運算放大器12的一端120(即運 算放大器電壓負端），以及功率放大器42的一端428(即功率 放大器電壓負端）則分別接地。而可變電阻4〇的一端4〇6(即 第二電阻接出端）則電性耦接於功率放大器42的一端 422(即功率訊號輸入端），且功率放大器42的一端426(即功 率訊號輸出端）電性耦接於電容44的一端442(即第三電容 甲端），並在電容44的一端444(即第三電容乙端）接上一個擴 音器46，以將在電容44的一端444上的訊號輸出。 接下來，請參照第2圖，其顯示了根據本發明之一較 佳實施例的電路連接方塊示意圖。其中包括了運作電源 9 -------------裝— (請先閱讀背面之注意事項一¢4、寫本頁) 訂· 經濟部智慧財產局員工消費合作杜印製 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） A7 B7 4 23 2彳 0 4 55 l〇twf.doc/008 五、發明說明（<g) 52，噪音控制電路50，突波防止電路54，功率放大器56 以及擴音器58。 其中，噪音控制電路50的一輸出端504(即噪音控制訊 號輸出端）電性耦接於功率放大器56的一輸入端564(即功 率訊號輸入端）。此外，噪音控制電路50的一接點502(即噪 音控制電壓接點）’則電性耦接於突波防止電路54的一接點 542 (即防止突波電路運作電源輸入端）；且噪音控制電路5〇 的一接點502，以及突波防止電路54的一接點542，都電性 耦接於運作電源52的一端522(即運作電源正端）。 另外’突波防止電路54的一接點544(即防止突波電路 運作電源輸出端）會電性耦接於功率放大器56的一端 562(即功率放大器電壓正端）。最後，功率放大器56的—端 568(即功率放大器電壓負端)接地，且功率放大器56的—端 566(即功率訊號輸出端)則連接一個擴音器58，以將功率放 大器56的一端566上的訊號做爲此反饋式主動噪音控制電 路的輸出。 接下來’請同時參照第3A-3D圖，其顯示了根據本發 明之一較佳實施例的電路連接圖。其應用於一個發聲裝置 中，可在控制噪音的同時，將此發聲裝置所原有發出的聲 音加以補償’此反饋式主動噪音控制電路包括運作電源 98 ’音源輸入器60 ’原始發聲音源輸入器77，功率放大器 71 ’第一運算放大器94，第二運算放大器95，第三運算放 大器96 ’第四運算放大器97，複數個被動元件，複數個電 容，電晶體92以及可變電阻73。 -------------J!^--- f靖先閱讀背面之注意事項^寫本頁) A1T__ 經濟部智慧財產局員工消費合作社印製 本纸張尺度適用_國國家標準（CNS)A4規格（210 X 297公釐） A7 B7 經濟部智慧財產局員工消費合作社印製 4 23 21 0 55 10twf*doc/008 五、發明說明） 另外’第3A圖中的f0j與第3B圖中的f點電性耦接，第 3A圖中的g點與第3B圖中的g點電性耦接》第3A圖中的h點 與第3B圖中的h點電性耦接，第3A圖中的i點與第3B圖中的 i點電性耦接，第3A圖中的j點與第3B圖中的j點電性耦接， 第3A圖中的k點與第圖中的k點電性耦接。而第3B圖中的 η點與第3C圖中的η點電性耦接，第3B圖中的〇點與第3C圖 中的〇點電性耦接，第3Β圖中的ρ點與第3C圖中的ρ點電性 耦接。且第3Β圖中的m點與第3D圖中的m點電性耦接， 其中，音源輸入器60的一端604(即音源負端）接地，且 此音源輸入器60的一端602(即音源正端）分別電性耦接於 被動元件85之一端854(即第十二被動甲端），以及被動元件 84之一端842(即第十一被動甲端）。而被動元件85之一端 852(即第十二被動乙端）則分別電性耦接至運算放大器94 之一端940(即第一運算放大器電壓正端），運算放大器95 之一端950(即第二運算放大器電壓正端），運算放大器96 之一端960(即第三運算放大器電壓正端），運算放大器97 之一端970(即第四運算放大器電壓正端），被動元件81的一 端814(即第八被動甲端），被動元件74的一端742(即第四被 動甲端），電容65之一端652(即第三電容甲端）以及電晶體 92之一端922(即電晶體輸入端，也就是電晶體的集極）° 其中，上述的被動元件85之一端852，運算放大器94 之一端940，運算放大器95之一端950，運算放大器96之一 端960,運算放大器97之一端970,被動元件81的一端814 ’ 被動元件74的一端742，電容65之一端652以及電晶體92之 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公爱） -----------J 身--- (請先閱讀背面之注意事項f寫本頁) 言Please also refer to FIGS. 1A-1B, which shows a circuit diagram according to a preferred embodiment of the present invention, which includes an operating power source 9, a sound source input device 10, a power amplifier 42, an operational amplifier 12, and a plurality of passive components. , A plurality of variable resistors and a plurality of capacitors. And point a in Figure 1A is electrically coupled with point a in Figure 1B. Point b in Figure 1A and Figure 1B apply the Chinese National Standard (CNS) A4 specification (210x 297 mm). 42321 0 55ltwf.doc / 008 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (4) Point b in the figure is electrically coupled, and point c in Figure 1A is the same as that in Figure 1B. Point c is electrically coupled. Point d in Figure 1A is electrically coupled with point d in Figure 1. Point e in Figure 1A is electrically coupled with Point e in Figure 1B. Among them, one end 104 (ie, the negative end of the sound source) of the sound source input device 10 is grounded, and one end 106 (ie, the positive end of the sound source) of the sound source input device 10 is electrically coupled to one end 362 of the capacitor 36 (ie, the first capacitor end). And one end 322 of the passive element 32 (that is, the tenth passive second end). In addition, one end W4 (ie, the tenth passive A terminal) of the passive component 32 is electrically coupled to one end 342 (the first resistance A terminal) of the variable resistor 34 and one end 424 (the power amplifier voltage) of the power amplifier 42 respectively. Positive terminal) and one terminal 128 of the operational amplifier 12 (that is, the positive terminal of the operational amplifier voltage). Among them, one end 324 of the passive element 32, one end 342 of the variable resistor 34, one end 424 of the power amplifier 42 and one end 128 of the operational amplifier 12 are all electrically coupled to the positive end of the operating power source 9. In addition, one end 364 of the capacitor 36 (ie, the second terminal of the first capacitor) is electrically connected to one end 144 (that is, the first passive one) of the passive element 14 and one end 184 (that is, the third passive one) of the passive element 18. ) And one end 222 of the passive element 22 (that is, the fifth passive one). The one end 142 (ie, the first passive second end) of the passive element 14 is electrically coupled to one end 16 4 (that is, the second passive second end) of the passive element 16 and one end 122 (that is, the operational signal input is positive) of the passive element 16. end). In addition, one end 224 (ie, the fifth passive second end) of the passive element 22 is electrically coupled to one end 262 (ie, the seventh passive second end) of the passive element 22 and one end 284 (ie, the eighth passive first end) of the passive element 28. And one end 304 of the passive element 30 (ie, the ninth passive one end). And one end 182 of the passive component 18 (that is, the third blanket 8 (please read the precautions on the back and fill in this page first) • ___ Items " ^ Write · LSJ. If This paper size applies Chinese National Standard (CNS) A4 Specifications (210 χ 297 mm) A7 4 2 3210 551〇twf, doc / 008 B7 V. Description of the invention () Moving end), it is electrically coupled to one end 202 of the passive element 20 (ie the fourth passive B) End), one end 282 of passive element 28 (that is, the eighth passive second end), one 244 of passive element 24 (that is, the sixth passive first end), and one end 124 of operational amplifier 12 (that is, the negative end of operational signal input). In addition, one end 344 of the variable resistor 34 (that is, the second terminal of the first resistor) is grounded, and one end 346 of the variable resistor 34 (that is, the first resistor connection terminal) is electrically coupled to one end of the passive element 16 respectively. 162 (ie, the second passive one), one end 204 (ie, the fourth passive one) of the passive element 20, and one end 264 (ie, the seventh passive one) of the passive component 26. The one end 126 of the operational amplifier 12 (that is, the output end of the amplifier) is electrically coupled to one end 242 of the passive element 24 (that is, the sixth passive second terminal), and one end of the passive element 30 (that is, the ninth passive second terminal). Terminal) and one terminal 382 of the capacitor 38 (ie, the second terminal of the second capacitor). Finally, one terminal 384 (the second terminal of the second capacitor) of the capacitor 38 is electrically coupled to one terminal 402 (the second terminal of the second resistor) of the variable resistor 40 and one terminal 404 (the second terminal of the variable resistor 40) The second terminal of the second resistor), one terminal 120 of the operational amplifier 12 (that is, the negative terminal of the operational amplifier voltage), and one terminal 428 of the power amplifier 42 (that is, the negative terminal of the power amplifier voltage) are grounded, respectively. The one end 406 of the variable resistor 40 (that is, the second resistance connection end) is electrically coupled to one end 422 (that is, the power signal input end) of the power amplifier 42 and one end 426 (that is, the power of the power amplifier 42) The signal output terminal) is electrically coupled to one end 442 of capacitor 44 (ie, the third capacitor A terminal), and one end 444 of capacitor 44 (ie, the third capacitor B terminal) is connected to a loudspeaker 46 so that Signal output on one end 444 of 44. Next, please refer to FIG. 2, which shows a schematic diagram of a circuit connection block according to a preferred embodiment of the present invention. It includes the operating power supply 9 ------------- installation-(please read the notes on the back first ¢ 4, write this page) This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) A7 B7 4 23 2 彳 0 4 55 ltwf.doc / 008 5. Description of the invention (&g; 52), noise control circuit 50 , Surge prevention circuit 54, power amplifier 56, and loudspeaker 58. Among them, an output terminal 504 (ie, a noise control signal output terminal) of the noise control circuit 50 is electrically coupled to an input terminal 564 (ie, a power signal input terminal) of the power amplifier 56. In addition, a contact 502 of the noise control circuit 50 (ie, a noise control voltage contact) 'is electrically coupled to a contact 542 of the surge prevention circuit 54 (that is, an input end of the power source for preventing the surge circuit from operating); and A contact 502 of the control circuit 50 and a contact 542 of the surge prevention circuit 54 are electrically coupled to one end 522 of the operating power supply 52 (ie, the positive end of the operating power supply). In addition, a contact 544 of the surge prevention circuit 54 (that is, the output end of the surge prevention circuit operation power supply) is electrically coupled to one end 562 of the power amplifier 56 (that is, the positive end of the power amplifier voltage). Finally, the-terminal 568 of the power amplifier 56 (that is, the negative voltage terminal of the power amplifier) is grounded, and the-terminal 566 of the power amplifier 56 (that is, the power signal output terminal) is connected to a loudspeaker 58 to connect one end 566 of the power amplifier 56 The above signal is used as the output of this feedback type active noise control circuit. Next, please also refer to FIGS. 3A-3D, which show a circuit connection diagram according to a preferred embodiment of the present invention. It is used in a sounding device, which can compensate the original sound of the sounding device while controlling the noise. This feedback-type active noise control circuit includes an operating power source 98 'sound source input 60' original sound source input 77, a power amplifier 71 'a first operational amplifier 94, a second operational amplifier 95, a third operational amplifier 96', a fourth operational amplifier 97, a plurality of passive elements, a plurality of capacitors, a transistor 92, and a variable resistor 73. ------------- J! ^ --- f Jingxian read the notes on the back ^ write this page) A1T__ Printed on paper scales for employees' cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs_ 国National Standard (CNS) A4 Specification (210 X 297 mm) A7 B7 Printed by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 4 23 21 0 55 10twf * doc / 008 V. Description of the invention) In addition, f0j in Figure 3A and Point f in Figure 3B is electrically coupled, and point g in Figure 3A is electrically coupled with point g in Figure 3B. Point h in Figure 3A is electrically coupled with point h in Figure 3B. Point i in Figure 3A is electrically coupled with point i in Figure 3B, point j in Figure 3A is electrically coupled with point j in Figure 3B, and point k in Figure 3A is The k point in the figure is electrically coupled. Point η in Figure 3B is electrically coupled to point η in Figure 3C. Point 0 in Figure 3B is electrically coupled to Point 0 in Figure 3C. Point ρ in Figure 3B is The ρ point in the 3C diagram is electrically coupled. The point m in FIG. 3B is electrically coupled to the point m in FIG. 3D, where one end 604 (ie, the negative end of the sound source) of the sound source input device 60 is grounded, and one end 602 (ie, the sound source) of the sound source input device 60 is grounded. The positive terminal) is electrically coupled to one terminal 854 (that is, the twelfth passive one) of the passive element 85 and one terminal 842 (that is, the eleventh passive one) of the passive component 85, respectively. The one terminal 852 (the twelfth passive second terminal) of the passive component 85 is electrically coupled to one terminal 940 (the first positive voltage terminal of the first operational amplifier) of the operational amplifier 94, and one terminal 950 (the second terminal of the operational amplifier 95). Operational amplifier voltage positive terminal), one terminal 960 of the operational amplifier 96 (that is, the third operational amplifier voltage positive terminal), one terminal 970 of the operational amplifier 97 (that is, the fourth operational amplifier voltage positive terminal), and one terminal 814 of the passive element 81 (that is, the first terminal Eight passive one terminals), one end 742 of passive component 74 (ie, fourth passive one), one terminal 652 of capacitor 65 (ie, third capacitor one), and one terminal 922 of transistor 92 (ie, transistor input terminal, that is, The collector of the transistor) ° Among them, one end 852 of the above-mentioned passive element 85, one end 940 of operational amplifier 94, one end 950 of operational amplifier 95, one end 960 of operational amplifier 96, one end 970 of operational amplifier 97, and one of passive element 81 One end 814 'One end 742 of the passive element 74, one end 652 of the capacitor 65, and the paper size of the transistor 92 are applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 public love) ----------- J Body --- (Please read first (Notes on the back f write this page)
4 23 21 0 55 10twf.doc/008 A7 B7 五、發明說明（ίύ) 一端922，都電性耦接至運作電源98的正端。 -III—-------裝--- - (請先閱讀背面之注意事項再I寫本頁) 此外，被動元件84之一端844(即第十一被動乙端）則分 別電性耦接到運算放大器94的一端942(即第—運算訊號輸 入正端），以及被動元件90之一端9〇4(即第十七被動甲端）。 且運算放大器94的一端944(即第一運算訊號負端）會分別 電性耦I接到被動元件83的一端834(即第十被動甲端），以及 被動元件86之一端864(即第十三被動甲端）。 接下來，將被動元件83的一端832(即第十被動乙端）分 別電性耦接到運算放大器94的一端946(即第一放大器輸出 端），被動元件82的一端824(即第九被動甲端)以及被動元件 66之一端664(即第二被動甲端）。 接下來，被動元件82的一端822(即第九被動乙端)則分 別電性耦接於運算放大器95之一端954(即第二運算訊號輸 入負端），以及被動元件89之一端894(即第十六被動甲端）。 -•線力_ 經濟部智慧財產局員工消費合作社印製 此外，被動元件89之一端892(即第十六被動乙端)分別 電性耦接於被動元件9〇之一端9〇2(即第十七被動乙端），被 動元件88之一端884(即第十五被動甲端）’被動元件76之一 端762(即第五被動甲端），以及運算放大器95之一端956(即 第二放大器輸出端）。 而被動元件81的一端812(即第八被動乙端），則分別電 性耦接於被動元件80的一端8〇4(即第七被動甲端）’以及運 算放大器95的一端952(即第二運算訊號輸入正端）。 而被動元件80的一端802(即第七被動乙端）則與被動 元件78的一端78啊即第六被動乙端)電性耦接，且都分別接 本纸張又度適用令國國家標渠（CNS)A4規格（210x297公釐） A7 4 2 3 210 五、發明說明（（丨） 地。 此外，被動元件78的一端782(即第六被動甲端)則分別 電性耦接於電容69的一端692(即第四電容甲端）’被動元件 74的一端744(即第四被動乙端），以及運算放大器96的一端 962(即第三運算訊號輸入正細）。 接下來，電容69的一端694(即第四電容乙端)分別電性 鍋接於被動元件70的一端704(即第十九被動甲端）’以及被 動元件72的一端724(即第二十被動甲端）。而被動元件70的 一端702(即第十九被動乙端）則電性耦接到原始發聲音源 輸入器77的一端774(即音樂輸入負端），且兩者都分別接 地；另外，被動元件72的一端722(即第二十被動乙端)則電 性耦接到原始發聲音源輸入器77的一端772(即音樂輸入正 端）。 此外，被動元件76之一端764(即第五被動乙端），則分 別電性耦接於運算放大器96之一端964(即第三運算訊號輸 入負端），以及被動元件87之—端874(即第十四被動甲端）。 而被動元件87之一端872(即第十四被動乙端），則分別 電性親接於運算放大器86之一端966(即第三放大器輸出 端），被動元件68之一'端684(即弟二被動甲端）’以及被勤[兀 件86的一端862(即第十三被動乙端）。 接下來，將被動元件66的一端662(即第二被動乙端）分 別電性稱接於被動元件68之一端682(即第三被動乙端），以 及運算放大器97的一端972(即第四運算訊號輸入正端）。 另外，被動元件88之一端882(即第十五被動乙端)分別 本紙張又度適用中國國家標準（CNS)A4規格（210 x 297公楚） 閱 讀 背 面 之 注 意 事 項 書裝 訂 經濟部智慧財產局員工消费合作社印製 2 3 21 ο ^ Α7 ---IQtwf.doc/008 B7 &、發明說明（（Ί) 電性耦接於運算放大器97的一端974(即第四運算訊號輸入 負端），以及被動元件64的一端644(即第〜被動甲端）。 接下來，被動元件64的一端642(即第一被動乙端），則 分別電性耦接到運算放大器97的一端976(即第四放大器輸 出端），以及電容63的一端634(即第一電容甲端）。 而電容63的一端632(即第一電容乙端）則電性親接到 可變電阻73的一端732(即可變電阻甲端）。且此可變電阻73 的一端734(即可變電阻乙端）電性耦接到功率放大器？1的 〜端714(即功率放大器電壓負端）’此外，此可變電阻73的 〜端734與功率放大器71的一端714都分別接地。 此外，電容65的一端654(即第三電容乙端)則分別電性 耦接於電晶體92的一端924(即第一電晶體輸出端，也就是 電晶體的基極），以及被動元件62之一端624，（即第十八被 動甲端）；且被動元件62之一端622(即第十八被動乙端）則 接地。 此外，電晶體92的一端926(即第二電晶體輸出端，也 ，就是電晶體的射極）電性耦接於功率放大器71的一端 718(即功率放大器電壓正端）。 接下來，可變電阻73的一端736(即可變電阻接出端）， 貝1Jm性耦接至功率放大器71的一端712(即功率訊號輸入 5尚）；且功率放大器71的一端716(即功率訊號輸出端）則電性 申禹接於電容67的一端672(即第二電容甲端），並以電容67的 -端674(即第二電容乙端)上之訊號爲整體電路的輸出。 在本實施例中，更在電容67的一端6M上連接一個擴 14 本紙張尺度適用中(CNS)A4規格（210 X 297公釐) -------------ϋ!裝--- f請先閱讀背面之注%事項坪填寫本頁) 訂4 23 21 0 55 10twf.doc / 008 A7 B7 V. Description of the Invention (ίύ) One end 922 is electrically coupled to the positive end of the operating power source 98. -III —------- install ----(Please read the notes on the back before I write this page) In addition, one end 844 of the passive component 84 (ie the eleventh passive second end) is electrically One terminal 942 of the operational amplifier 94 (that is, the seventh operational signal input positive terminal) is coupled to one terminal 904 of the passive component 90 (the seventeenth passive one terminal). And one end 944 of the operational amplifier 94 (that is, the negative end of the first operational signal) is electrically coupled to one end 834 of the passive component 83 (that is, the tenth passive first terminal) and one end 864 of the passive component 86 (that is, the tenth Three passive A-terminal). Next, one end 832 (ie, the tenth passive second end) of the passive element 83 is electrically coupled to one end 946 (ie, the first amplifier output end) of the operational amplifier 94, and one end 824 (ie, the ninth passive element) of the passive element 82. A terminal) and one terminal 664 of the passive element 66 (ie, the second passive terminal). Next, one end 822 (the ninth passive second terminal) of the passive component 82 is electrically coupled to one terminal 954 (the second operational signal input negative terminal) of the operational amplifier 95 and one terminal 894 (that is, the second operational signal input terminal) of the operational amplifier 95, respectively. Sixteenth passive A-side). -• 线 力 _ Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs In addition, one end 892 of the passive component 89 (ie, the sixteenth passive second end) is electrically coupled to one of the passive components 90 and 902 (the first Seventeen passive second terminals), one of the passive components 88 is 884 (the fifteenth passive one), one of the passive components 76 is 762 (the fifth passive one), and one of the operational amplifiers 95 is 956 (the second amplifier). Output). The one end 812 of the passive component 81 (ie, the eighth passive second terminal) is electrically coupled to one end 804 of the passive component 80 (that is, the seventh passive first terminal) and one end 952 of the operational amplifier 95 (that is, the eighth passive second terminal). (Two input signal input positive end). The one end 802 of the passive element 80 (ie, the seventh passive second end) is electrically coupled to one end 78 of the passive element 78 (that is, the sixth passive second end), and they are respectively connected to this paper and are applicable to the national standard. Channel (CNS) A4 specification (210x297 mm) A7 4 2 3 210 V. Description of the invention ((丨) Ground. In addition, one end 782 of the passive component 78 (ie, the sixth passive first terminal) is electrically coupled to the capacitor, respectively. One end 692 of 69 (that is, the first terminal of the fourth capacitor), one end 744 of the passive element 74 (that is, the fourth passive second terminal), and one end 962 of the operational amplifier 96 (that is, the third operational signal input is thin). Next, the capacitor One end 694 of 69 (ie, the second terminal of the fourth capacitor) is electrically connected to one end 704 (ie, the nineteenth passive one) of the passive element 70 and one end 724 (ie, the twentieth passive one) of the passive element 72. The one end 702 of the passive component 70 (that is, the nineteenth passive second end) is electrically coupled to one end 774 (that is, the negative end of music input) of the original sound source input device 77, and both are grounded separately; in addition, the passive One end 722 (ie, the twentieth passive second end) of the component 72 is electrically coupled to the original sound source One end 772 of the input device 77 (that is, the positive end of music input). In addition, one end 764 of the passive component 76 (that is, the fifth passive second terminal) is electrically coupled to one end 964 of the operational amplifier 96 (that is, the third operational signal). Input negative terminal), and terminal 874 of passive element 87 (that is, the fourteenth passive A terminal). One terminal 872 of passive component 87 (that is, the fourteenth passive B terminal) is electrically connected to operational amplifier 86, respectively. One terminal 966 (ie the third amplifier output), one of the passive components 68 'terminal 684 (ie the second passive one)' and one of the passive components 86 (the thirteenth passive second terminal). Next, one end 662 (the second passive second terminal) of the passive component 66 is electrically connected to one end 682 (the third passive second terminal) of the passive component 68 and one end 972 (the fourth operational terminal) of the operational amplifier 97. The positive end of the signal input.) In addition, one end 882 of passive element 88 (ie, the fifteenth passive second end) is respectively applicable to the Chinese National Standard (CNS) A4 specification (210 x 297 cm). Read the notes on the back Binding of Employees' Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs Printed 2 3 21 ο ^ Α7 --- IQtwf.doc / 008 B7 & Description of the invention ((Ί) is electrically coupled to one end 974 of the operational amplifier 97 (that is, the fourth operational signal input negative end), and passive One end 644 of element 64 (ie, the first to passive one). Next, one end 642 of passive element 64 (ie, the first passive second terminal) is electrically coupled to one end 976 of the operational amplifier 97 (ie, the fourth amplifier). Output terminal), and one terminal 634 of capacitor 63 (ie, the first capacitor terminal). The one end 632 of the capacitor 63 (ie, the second terminal of the first capacitor) is electrically connected to one end 732 of the variable resistor 73 (that is, the first terminal of the variable resistor). And one end 734 (that is, the second end of the variable resistor) of the variable resistor 73 is electrically coupled to the power amplifier? 1 ~ terminal 714 (ie, the negative terminal of the power amplifier voltage) 'In addition, the ~ terminal 734 of the variable resistor 73 and the terminal 714 of the power amplifier 71 are grounded, respectively. In addition, one end 654 of the capacitor 65 (ie, the third terminal of the third capacitor) is electrically coupled to one end 924 of the transistor 92 (ie, the first transistor output terminal, which is the base of the transistor), and the passive element 62. One terminal 624 (ie, the eighteenth passive one terminal); and one terminal 622 of the passive element 62 (ie, the eighteenth passive second terminal) is grounded. In addition, one terminal 926 of the transistor 92 (that is, the second transistor output terminal, that is, the emitter of the transistor) is electrically coupled to one terminal 718 of the power amplifier 71 (that is, the positive terminal of the power amplifier voltage). Next, one end 736 of the variable resistor 73 (that is, the variable resistance connection terminal) is coupled to one end 712 of the power amplifier 71 (that is, the power signal input 5 is still); and one end 716 of the power amplifier 71 (that is, The power signal output terminal) is electrically connected to one end 672 of the capacitor 67 (ie, the first terminal of the second capacitor), and the signal on the-terminal 674 of the capacitor 67 (that is, the second terminal of the second capacitor) is used as the output of the overall circuit. . In this embodiment, one end of the capacitor 67 6M is connected with an expanded 14 paper size applicable (CNS) A4 specification (210 X 297 mm) ------------- ϋ! Install --- f Please read the note at the back of the page and fill in this page) Order
.線V 經濟邹智慧財產局員-X消費合作杜印製 4 2 3 2 55 10twf.doc/008 A7 B7 五、發明說明（β) 音器75，以將訊號擴大並發出。而由電晶體92，電容65 以及被動元件62所共同組成的突波防止電路，其作用爲防 止電路切換時所生的突波。 必須注意的是，上述的所有實施例中，任一個被動元 件都可以是任意個電阻或是任意個電容，或是由電阻與電 容之組合而形成。 綜上所述，本發明的優點爲，使用簡單的電路，達到 以反饋式電路來控制噪音的效果。並藉由同一個電路對所 想保留的聲音加以補償，使得音質更好。 雖然本發明已以較佳實施例揭露如上，然其並非用以 限定本發明，任何熟習此技藝者，在不脫離本發明之精神 和範圍內，當可作各種之更動與潤飾，因此本發明之保護 範圍當視後附之申請專利範圍所界定者爲準。 請 先 閱 讀 背 意 事 ϊ〇 填义 I裝 頁 訂 經濟部智慧財產局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS)A4規格（210x 297公釐）.Line V Economy Zou Intellectual Property Bureau Member-X Consumption Du Du 4 2 3 2 55 10twf.doc / 008 A7 B7 V. Description of Invention (β) Sounder 75 to expand and send the signal. The surge prevention circuit composed of the transistor 92, the capacitor 65 and the passive element 62 is used to prevent the surge generated when the circuit is switched. It must be noted that in any of the above embodiments, any passive element may be any number of resistors or any number of capacitors, or a combination of resistors and capacitors. In summary, the present invention has the advantage of using a simple circuit to achieve the effect of controlling noise with a feedback circuit. And the same circuit is used to compensate the sound you want to keep, making the sound quality better. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and retouches without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the attached patent application. Please read the memorandum ϊ〇 Fill in the form I Binding Page Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs This paper size applies to China National Standard (CNS) A4 (210x 297 mm)