201121340 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明涉及一種爆音消除電路。 【先前技術·】 [0002] 當今之音頻播放設備，特別是手機、MP3播放器等可檇式 播放設備，一般常存i有電源開關機之瞬間產生爆音之 問題，其主要原因在於開關機之瞬間，由於電壓跳變產 生突波電壓衝擊音頻播放器。 [0003] 惟，現在大多數之爆音消除電路大多採用集成晶片進行 爆音消除，如MAX9890。這種集成晶片價格比較昂貴，大 大增加了爆音消除電路之成本。 【發明内容】 [0004] 有鑒於此，有必要提供一種成本低之爆音消除電路。 [0005] 一種爆音消除電路，其用於為一電子裝置消除爆音。所 述音頻播放電路包括一數字處理器、一音頻播放器及一 耦合於所述數字處理器與音頻播放器之間之耦合電容。 所述數字處理器用於輪出音頻訊號。所述耦合電容用於 將數字處理器輸出之音頻訊號耦合輸出至音頻播放器。 所述音頻播放器用於將音頻訊號轉換成聲音訊號播放。 該爆音消除電路還包括一控制器、一初始化電路。所述 控制器包括一控制端及一輸出端。所述控制端連接至所 述數字處理器。所述輸出端用於在電子裝置剛開機或關 機，所述耦合電容與音頻播放器之間之線路上產生跳變 電壓時輸出一第一控制電平。所述初始化電路包括一第 一電子開關，所述第一電子開關包括第一控制端、第一 098141278 表單編號A0101 第4頁/共14頁 0982070803-0 201121340 電子端及第二電子端。所述第一控制端用於控制第一電 子端及第二電子端之間之導通與斷開。所述第一電子開 關之第一控制端連接至所述控制器之輸出端。所述第一 電子開關之第一電子端連接至所述音頻播放器之輸入端 。所述第一電子開關之第二電子端接地。所述第一電子 開關之第一控制端在接收到所述第一控制電平時，控制 所述第一電子開關導通。所述耦合電容與所述音頻播放 器之間之線路上之電壓經由所述第一電子開關之第一電 子端與第二電子端導通至，以消除爆音現象。 Ο [0006] [0007] Ο 相較於先前技術，所述爆音消除電路可通過所述初始化 電路消除電子裝置剛開機或正常關機或異常斷電時，由 於所述耦合電容與所述音頻播放器之間之線路上之電壓 由於跳變而產生之爆音。從而無需採用集成晶片進行爆 音消除，降低了爆音消除電路之成本。 【實施方式】 請參閱圖1，為本發明較佳實施方式提供之爆音消除電路 100，其可用於手機、MP4、數字相機等一些電子裝置中 。本實施方式中，所述電子裝置為數字相機（圖未示） 。該爆音消除電路100連接數字相機之音頻播放電路10， 用於消除數字相機開關機時之爆音現象。該爆音消除電 路10 0包括一控制器15、一初始化電路20及一保護電路 30 ° 所述音頻播放電路10包括一數字處理器11、一音頻播放 器12及一耦合於所述數字處理器11與音頻播放器12之間 之耦合電容C。所述數字處理器11用於輸出音頻訊號。所 098141278 表單編號Α0101 第5頁/共14頁 0982070803-0 [0008] 201121340 述耦合電容C用於將數字處理器11輸出之音頻訊號耦合輸 出至音頻播放器12。所述音頻播放器12用於將音頻訊號 轉換成聲音訊號播放。 [0009] 所述控制器15包括一控制端150及一輸出端151。所述控 制端150連接至所述數字處理器11。所述輸出端151用於 輸出一第一控制電平至所述初始化電路20。本實施方式 中，所述第一控制電平為高電平。可以理解之是，所述 控制器1 5與所述數字處理器11可以為兩個相互獨立之元 件，也可將控制器15直接集成在所述數字處理器11上， 並不限於本實施方式。本實施方式中，控制器15採用數 字相機中之中央處理器。 [0010] 所述初始化電路20包括一第一電阻R1及一第一電子開關 Q1。所述第一電子開關Q1包括一第一控制端、一第一電 子端及一第二電子端。所述第一控制端用於控制第一電 子端及第二電子端之間之導通與斷開。本實施方式中， 所述第一電子開關Q1為一NPN型三極管，所述三極管之基 極B、集電極C及發射極E分別構成第一電子開關Q1之第一 控制端、第一電子端及第二電子端。所述第一電子開關 Q1之第一控制端通過所述第一電阻R1連接至所述控制器 15之輸出端151，所述第一電子開關Q1之第一電子端連接 至所述音頻播放器12之輸入端。所述第一電子開關Q1之 第二電子端接地。 [0011] 所述保護電路30包括一電池31、一第二電子開關Q2、一 復位電路32及一第二電阻R2。本實施方式中，所述電池 31為所述數字相機内之時鐘電池。所述第二電子開關Q2 098141278 表單編號A0101 第6頁/共14頁 0982070803-0 201121340 Ο 包括一第二控制端、第三電子端及第四電子端。所述第 二控制‘端用於控制第三電子端及第四電子端之間之導通 與斷開。本實施方式中，所述第二電子開關Q2為一ΡΝΡ型 三極管，所述三極管之基極Β、集電極C及發射極Ε分別構 成第二電子開關Q2之第二控制端、第三電子端及第四電 子端。所述第二電子開關Q2之第二控制端通過所述第二 電阻R2連接至所述復位電路32之輸出端，所述第二電子 開關Q2之第三電子端連接在所述控制器15之輸出端151。 所述第二電子開關Q2之第四電子端連接至所述時鐘電池 31之輸出端。所述復位電路32用於輸出一第二控制電平 。本實施方式中，所述復位電路32為數字相機内之復位 晶片，所述復位電路32輸出之第二控制電平為低電平。 [0012] 當整合有所述爆音消除電路100之數字相機開機時，所述 控制器15開啟數字處理器11發出音頻訊號前一段時間， 〇 如10毫秒，所述控制器15之輸出端1 51輸出一第一控制電 平至第一電子開關Q1之第一控制端，該第一控制電平促 使第一電子開關Q1導通。所述耦合電容C與所述音頻播放 器12之間之線路上由於數字相機剛開機時產生之跳變電 壓經由所述第一電子開關Q1導通至地。以消除剛開機時 產生之爆音。當所述控制器15開啟數字處理器11發出音 頻訊號後一段時間，如10毫秒，所述控制器15之輸出端 151停止輸出第一控制電平，所述第一電子開關Q1截止。 所述數字處理器11輸出之音頻訊號經耦合電容C耦合至所 述音頻播放器12進行播放。 [0013] 當數字相機關機時，同樣地，所述控制器15關閉數字處 098141278 表單編號Α0101 第7頁/共14頁 0982070803-0 201121340 理器11發出音頻訊號前一段時間，如10毫秒，所述控制 器15之輸出端151輸出所述第一控制電平，該第一控制電 平促使第一電子開關Q1導通。所述耦合電容C與所述音頻 播放器1 2之間之線路上由於數字相機剛關機時產生之跳 變電壓經由所述第一電子開關Q1導通至地，以消除電子 裝置關機時產生之爆音/。 [0014] 當數字相機異常斷電時，所述復位電路32之一輸出引腳 輸出第二控制電平至第二電子開關Q2之第二控制端，所 述第二電子開關Q2導通，所述時鐘電池31輸出高電平經 第二電子開關Q2流至第一電子開關Q1之第一控制端，致 使第一電子開關Q1導通。由於數字處理器11剛停止輸出 音頻訊號之瞬間，所述耦合電容C與所述音頻播放器12之 間之電壓由於跳變而產生之爆音經由所述第一電子開關 Q1導通至地，以消除電子裝置發生異常斷電時產生之爆 音。 [0015] 所述爆音消除電路可通過所述初始化電路消除電子裝置 剛開機或正常關機時，由於所述耦合電容與所述音頻播 放器之間之線路上之電壓由於跳變而產生之爆音。還可 通過所述保護電路消除電子裝置異常斷電時，由於數字 處理器剛停止輸出音頻訊號之瞬間，所述耦合電容與所 述音頻播放器之間之線路上之電壓由於跳變而產生之爆 音。由於無需採用集成晶片進行爆音消除，降低了爆音 消除電路設計成本。 [0016] 綜上所述，本發明確已符合發明專利之要件，遂依法提 出專利申請。惟，以上所述者僅為本發明之較佳實施方 098141278 表單編號A0101 第8頁/共14頁 0982070803-0 201121340 [0017] 式’自不能以此限制本案之申請專利範圍。舉凡热悉本 案技藝之人士援依本發明之精神所作之等效修飾或變化 ，皆應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 圖1是本發明較佳實施方式提供之爆音消除電路之電路圖 〇 [0018] 【主要元件符號說明】 爆音消除電路：10 0 Ο [0019] 音頻播放電路：10 [0020] 數字處理器：11 [0021] 音頻播放器：12 [0022] 耦合電容：C [0023] 控制器：15 [0024] 控制端：150 〇 [0025] 輸出端：151 [0026] 初始化電路：20 [0027] 第一電阻：R1 [0028] 第一電子開關：Q1 [0029] 保護電路：30 [0030] 電池：31 [0031] 第二電子開關：Q2 098141278 表單編號A0101 第9頁/共14頁 0982070803-0 32201121340 [0032] [0033] 復位電路 第二電阻 R2 098141278 表單編號A0101 第10頁/共14頁 0982070803-0201121340 VI. Description of the Invention: [Technical Field of the Invention] [0001] The present invention relates to a popping elimination circuit. [Prior Art·] [0002] Today's audio playback devices, especially mobile phones, MP3 players and other portable playback devices, generally have the problem of bursting sounds when there is a power switch machine. The main reason is that the switch machine Instantly, due to voltage jumps, a surge voltage is generated to impact the audio player. [0003] However, most of the current pop-up cancellation circuits mostly use integrated chips for pop-up cancellation, such as the MAX9890. Such integrated chips are relatively expensive and greatly increase the cost of the pop-up cancellation circuit. SUMMARY OF THE INVENTION [0004] In view of the above, it is necessary to provide a low-cost pop-up cancellation circuit. [0005] A pop-up cancellation circuit for canceling popping sound for an electronic device. The audio playback circuit includes a digital processor, an audio player, and a coupling capacitor coupled between the digital processor and the audio player. The digital processor is used to rotate an audio signal. The coupling capacitor is used to couple the audio signal output by the digital processor to the audio player. The audio player is configured to convert an audio signal into an audio signal. The pop-up cancellation circuit further includes a controller and an initialization circuit. The controller includes a control end and an output end. The control terminal is coupled to the digital processor. The output terminal is configured to output a first control level when the electronic device is turned on or off, and a jump voltage is generated on the line between the coupling capacitor and the audio player. The initialization circuit includes a first electronic switch, and the first electronic switch includes a first control terminal, a first 098141278, a form number A0101, a fourth page, a total of 14 pages, a 0982070803-0, a 201121340 electronic terminal and a second electronic terminal. The first control terminal is configured to control conduction and disconnection between the first electronic terminal and the second electronic terminal. A first control end of the first electronic switch is coupled to an output of the controller. A first electronic end of the first electronic switch is coupled to an input of the audio player. The second electronic end of the first electronic switch is grounded. The first control end of the first electronic switch controls the first electronic switch to be turned on when receiving the first control level. A voltage on the line between the coupling capacitor and the audio player is conducted to the first electronic end and the second electronic end of the first electronic switch to eliminate a popping phenomenon. 0006 [0006] [0007] Compared with the prior art, the pop-up cancellation circuit can eliminate the electronic device just after power-on or normal shutdown or abnormal power-off, due to the coupling capacitor and the audio player. The voltage between the lines on the line is due to a jump. This eliminates the need for integrated wafers for pop-up cancellation and reduces the cost of pop-up cancellation circuitry. [Embodiment] Please refer to FIG. 1 , which is a pop-up canceling circuit 100 according to a preferred embodiment of the present invention, which can be used in some electronic devices such as mobile phones, MP4s, and digital cameras. In this embodiment, the electronic device is a digital camera (not shown). The pop-up cancellation circuit 100 is connected to the audio playback circuit 10 of the digital camera for eliminating the popping phenomenon when the digital camera is turned on and off. The pop-up cancel circuit 10 0 includes a controller 15 , an initialization circuit 20 , and a protection circuit 30 . The audio playback circuit 10 includes a digital processor 11 , an audio player 12 , and a digital processor 11 . Coupling capacitance C with the audio player 12. The digital processor 11 is configured to output an audio signal. 098141278 Form No. Α0101 Page 5 of 14 0982070803-0 [0008] 201121340 The coupling capacitor C is used to couple the audio signal output from the digital processor 11 to the audio player 12. The audio player 12 is configured to convert an audio signal into an audio signal. The controller 15 includes a control terminal 150 and an output terminal 151. The control terminal 150 is connected to the digital processor 11. The output terminal 151 is for outputting a first control level to the initialization circuit 20. In this embodiment, the first control level is a high level. It can be understood that the controller 15 and the digital processor 11 can be two independent components, and the controller 15 can be directly integrated on the digital processor 11, which is not limited to the embodiment. . In the present embodiment, the controller 15 employs a central processing unit in a digital camera. [0010] The initialization circuit 20 includes a first resistor R1 and a first electronic switch Q1. The first electronic switch Q1 includes a first control terminal, a first electronic terminal, and a second electronic terminal. The first control terminal is configured to control conduction and disconnection between the first electronic terminal and the second electronic terminal. In this embodiment, the first electronic switch Q1 is an NPN-type triode, and the base B, the collector C and the emitter E of the triode constitute a first control end and a first electronic end of the first electronic switch Q1, respectively. And a second electronic end. The first control end of the first electronic switch Q1 is connected to the output end 151 of the controller 15 through the first resistor R1, and the first electronic end of the first electronic switch Q1 is connected to the audio player 12 input. The second electronic end of the first electronic switch Q1 is grounded. [0011] The protection circuit 30 includes a battery 31, a second electronic switch Q2, a reset circuit 32, and a second resistor R2. In this embodiment, the battery 31 is a clock battery in the digital camera. The second electronic switch Q2 098141278 Form No. A0101 Page 6 of 14 0982070803-0 201121340 包括 includes a second control terminal, a third electronic terminal and a fourth electronic terminal. The second control terminal is used to control the conduction and disconnection between the third electronic terminal and the fourth electronic terminal. In this embodiment, the second electronic switch Q2 is a ΡΝΡ-type triode, and the base Β, the collector C and the emitter Ε of the triode constitute the second control end and the third electronic end of the second electronic switch Q2, respectively. And the fourth electronic end. The second control end of the second electronic switch Q2 is connected to the output end of the reset circuit 32 through the second resistor R2, and the third electronic end of the second electronic switch Q2 is connected to the controller 15 Output 151. A fourth electronic terminal of the second electronic switch Q2 is coupled to an output of the clock battery 31. The reset circuit 32 is for outputting a second control level. In this embodiment, the reset circuit 32 is a reset chip in the digital camera, and the second control level outputted by the reset circuit 32 is a low level. [0012] When the digital camera integrated with the pop-up cancel circuit 100 is turned on, the controller 15 turns on the digital processor 11 for a period of time before the audio signal is sent, for example, 10 milliseconds, and the output end of the controller 15 is 51. A first control level is output to the first control terminal of the first electronic switch Q1, the first control level causing the first electronic switch Q1 to be turned on. A trip voltage generated on the line between the coupling capacitor C and the audio player 12 due to the digital camera just turned on is conducted to the ground via the first electronic switch Q1. To eliminate the popping sound that happens when you turn it on. When the controller 15 turns on the digital processor 11 to emit an audio signal for a period of time, such as 10 milliseconds, the output 151 of the controller 15 stops outputting the first control level, and the first electronic switch Q1 is turned off. The audio signal output by the digital processor 11 is coupled to the audio player 12 for playback via a coupling capacitor C. [0013] When the digital camera is turned off, similarly, the controller 15 turns off the digital number 098141278 Form No. 1010101 Page 7 / Total 14 Page 0992070803-0 201121340 The processor 11 sends an audio signal for a period of time, such as 10 milliseconds. The output 151 of the controller 15 outputs the first control level, which causes the first electronic switch Q1 to be turned on. The jump voltage generated on the line between the coupling capacitor C and the audio player 12 due to the digital camera just turned off is conducted to the ground via the first electronic switch Q1 to eliminate the popping sound generated when the electronic device is turned off. /. [0014] when the digital camera is abnormally powered off, one of the output circuits of the reset circuit 32 outputs a second control level to the second control end of the second electronic switch Q2, and the second electronic switch Q2 is turned on, The clock battery 31 outputs a high level to the first control terminal of the first electronic switch Q1 via the second electronic switch Q2, causing the first electronic switch Q1 to be turned on. Since the digital processor 11 just stops outputting the audio signal, the popping sound generated by the voltage between the coupling capacitor C and the audio player 12 is turned on to the ground via the first electronic switch Q1 to eliminate A popping sound generated when an electronic device is abnormally powered off. [0015] The pop-up canceling circuit can eliminate the popping sound generated by the voltage on the line between the coupling capacitor and the audio player due to the jump when the electronic device is turned on or normally turned off by the initialization circuit. The protection circuit can also be used to eliminate the abnormal power-off of the electronic device. When the digital processor just stops outputting the audio signal, the voltage on the line between the coupling capacitor and the audio player is generated due to the jump. Sonic boom. The need for pop-up cancellation circuit design is reduced by eliminating the need for integrated wafers for pop-up cancellation. [0016] In summary, the present invention has indeed met the requirements of the invention patent, and the patent application is filed according to law. However, the above is only the preferred embodiment of the present invention. 098141278 Form No. A0101 Page 8 of 14 0982070803-0 201121340 [0017] The formula "cannot limit the scope of the patent application of this case." Equivalent modifications or variations made by those skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a pop-up cancel circuit provided by a preferred embodiment of the present invention [0018] [Explanation of main component symbols] Pop-up cancel circuit: 10 0 Ο [0019] Audio playback circuit: 10 [0020] Digital Processor: 11 [0021] Audio Player: 12 [0022] Coupling Capacitor: C [0023] Controller: 15 [0024] Control Terminal: 150 〇 [0025] Output: 151 [0026] Initialization Circuit: 20 [ 0027] First resistance: R1 [0028] First electronic switch: Q1 [0029] Protection circuit: 30 [0030] Battery: 31 [0031] Second electronic switch: Q2 098141278 Form number A0101 Page 9 of 14 0982070803 -0 32201121340 [0033] Reset circuit second resistor R2 098141278 Form number A0101 Page 10 of 14 0982070803-0