TWI420915B - Electronic apparatus - Google Patents
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- TWI420915B TWI420915B TW97125414A TW97125414A TWI420915B TW I420915 B TWI420915 B TW I420915B TW 97125414 A TW97125414 A TW 97125414A TW 97125414 A TW97125414 A TW 97125414A TW I420915 B TWI420915 B TW I420915B
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Description
本發明涉及電子裝置，特別涉及一種具有音頻輸出功能的電子裝置。 The present invention relates to an electronic device, and more particularly to an electronic device having an audio output function.
隨著電子行業的迅速發展，各種音/視頻電子裝置開始走進人們的生活。如MP3、MP4、Walkman、影音播放機以及可攜式光碟播放器等。人們藉由音/視頻電子裝置欣賞音樂、觀看電影等，豐富了人們的業餘生活。 With the rapid development of the electronics industry, various audio/video electronic devices have begun to enter people's lives. Such as MP3, MP4, Walkman, video player and portable CD player. People enjoy music and watch movies through audio/video electronic devices, which enrich people's spare time.
為了滿足消費者在不同場合的需求，業界大多數的消費類電子產品都設計有揚聲器(Speaker)及耳機(Headphone)，使用者可以選擇使用揚聲器或耳機來欣賞音樂。上述電子產品通常具有一功率放大單元，其用於接收音頻訊號，並對音頻訊號進行功率放大，以分別輸出給揚聲器及耳機插口。功率放大單元具有一控制端，其基於耳機插入或拔出耳機插口操作來控制功率放大單元是否輸出音頻訊號給揚聲器。 In order to meet the needs of consumers in different occasions, most of the consumer electronics in the industry are designed with speakers and headphones, users can choose to use speakers or headphones to enjoy music. The above electronic product usually has a power amplifying unit for receiving audio signals and power-amplifying the audio signals for output to the speaker and the earphone jack respectively. The power amplifying unit has a control terminal that controls whether the power amplifying unit outputs an audio signal to the speaker based on the operation of inserting or unplugging the earphone jack.
當使用者將耳機插入耳機插口時，功率放大單元的控制端接收到高電平訊號，此時功率放大單元停止輸出音頻訊號給揚聲器，耳機播放聲音。當使用者未將耳機插入耳機插口時，功率放大單元的控制端接收到低電平訊號，此時功率放大單元輸出音頻訊號給 揚聲器以播放聲音。 When the user inserts the earphone into the earphone jack, the control end of the power amplifying unit receives the high level signal, and at this time, the power amplifying unit stops outputting the audio signal to the speaker, and the earphone plays the sound. When the user does not insert the earphone into the earphone jack, the control terminal of the power amplifying unit receives the low level signal, and at this time, the power amplifying unit outputs the audio signal to Speaker to play the sound.
然而，習知電路設計中，在揚聲器播放聲音時，功率放大單元也輸出音頻訊號給耳機插口，且音頻訊號經過耳機插口輸入到功率放大單元的控制端。當音頻訊號的峰值電壓較大(揚聲器的音量較大)時，將導致功率放大單元的控制端的輸入訊號為高電平訊號，此時功率放大單元停止輸出音頻訊號給揚聲器。如此，音頻訊號中的高電平訊號將會使揚聲器發音時斷時續，嚴重地降低了音質。 However, in the conventional circuit design, when the speaker plays the sound, the power amplifying unit also outputs the audio signal to the earphone jack, and the audio signal is input to the control end of the power amplifying unit through the earphone jack. When the peak voltage of the audio signal is large (the volume of the speaker is large), the input signal of the control terminal of the power amplifying unit is a high level signal, and the power amplifying unit stops outputting the audio signal to the speaker. In this way, the high level signal in the audio signal will make the speaker sound intermittent, which seriously reduces the sound quality.
有鑒於此，有必要提供一種高音質的電子裝置。 In view of this, it is necessary to provide a high-quality electronic device.
一種電子裝置，其包括具有控制端的功率放大單元、分壓單元、濾波單元、耳機介面電路及揚聲器。功率放大單元用於對音頻訊號進行功率放大處理，並將處理後的音頻訊號分別輸出給耳機介面電路及揚聲器。耳機介面電路包括用於與耳機連接的耳機插口及檢測耳機是否插入的開關單元，開關單元連接在耳機插口及所述控制端之間，用於根據耳機是否插入到耳機插口而調整所述分壓單元產生的傳送到所述控制端的電壓，功率放大單元根據其控制端接收到的所述電壓控制所述揚聲器是否工作。濾波單元與所述控制端相連，用於濾除從所述耳機插口傳輸到所述控制端的音頻訊號。 An electronic device includes a power amplifying unit having a control end, a voltage dividing unit, a filtering unit, a headphone interface circuit, and a speaker. The power amplifying unit is configured to perform power amplification processing on the audio signal, and output the processed audio signal to the earphone interface circuit and the speaker respectively. The earphone interface circuit includes a headphone jack for connecting to the earphone and a switch unit for detecting whether the earphone is inserted, and the switch unit is connected between the earphone jack and the control end for adjusting the partial pressure according to whether the earphone is inserted into the earphone jack The unit generates a voltage transmitted to the control terminal, and the power amplifying unit controls whether the speaker operates according to the voltage received by the control terminal. The filtering unit is connected to the control end for filtering the audio signal transmitted from the earphone jack to the control end.
上述電子裝置，藉由濾波單元對從所述耳機插口傳輸到控制端的音頻訊號進行濾除，如此可有效地提高音質，不會出現揚聲器發音時斷時續的現象。 In the above electronic device, the audio signal transmitted from the earphone jack to the control end is filtered by the filtering unit, so that the sound quality can be effectively improved, and the phenomenon that the speaker sounds intermittently does not occur.
100‧‧‧電子裝置 100‧‧‧Electronic devices
12‧‧‧功率放大單元 12‧‧‧Power amplification unit
16‧‧‧耳機介面電路 16‧‧‧ headphone interface circuit
18‧‧‧第二電解電容 18‧‧‧Second electrolytic capacitor
20‧‧‧分壓單元 20‧‧‧Voltage unit
22‧‧‧第一分壓單元 22‧‧‧First partial pressure unit
25‧‧‧第三分壓單元 25‧‧‧ Third pressure division unit
120‧‧‧訊號輸入端 120‧‧‧Signal input
124、126‧‧‧正相輸出端 124, 126‧‧ ‧ positive phase output
160‧‧‧耳機插口 160‧‧‧ headphone jack
164、165‧‧‧導電端 164, 165‧‧‧ conductive end
166、169‧‧‧接觸端 166, 169‧‧‧ contact end
V1‧‧‧直流電源 V1‧‧‧DC power supply
250‧‧‧第三電阻 250‧‧‧ third resistor
262‧‧‧電容 262‧‧‧ Capacitance
10‧‧‧音頻介面 10‧‧‧Audio interface
14、15‧‧‧揚聲器 14, 15‧‧‧ Speakers
17‧‧‧第一電解電容 17‧‧‧First electrolytic capacitor
19‧‧‧耳機 19‧‧‧ headphones
21‧‧‧電源介面 21‧‧‧Power interface
24‧‧‧第二分壓單元 24‧‧‧Second voltage division unit
26‧‧‧濾波單元 26‧‧‧Filter unit
122‧‧‧控制端 122‧‧‧Control terminal
125、128‧‧‧負相輸出端 125, 128‧‧‧ Negative phase output
162‧‧‧開關單元 162‧‧‧Switch unit
168‧‧‧接地端 168‧‧‧ Grounding terminal
220‧‧‧第一電阻 220‧‧‧First resistance
240‧‧‧第二電阻 240‧‧‧second resistance
260‧‧‧第四電阻 260‧‧‧fourth resistor
圖1為一較佳實施方式的電子裝置之具體電路圖。 1 is a detailed circuit diagram of an electronic device according to a preferred embodiment.
如圖1所示係一較佳實施方式的電子裝置100的具體電路圖。電子裝置100包括音頻介面10，功率放大單元12，揚聲器14、15，耳機介面電路16，第一電解電容17，第二電解電容18，耳機19，分壓單元20，以及濾波單元26。耳機介面電路16包括供耳機19插入的耳機插口160及檢測耳機19是否插入的開關單元162。 FIG. 1 is a specific circuit diagram of an electronic device 100 according to a preferred embodiment. The electronic device 100 includes an audio interface 10, a power amplifying unit 12, speakers 14, 15, an earphone interface circuit 16, a first electrolytic capacitor 17, a second electrolytic capacitor 18, an earphone 19, a voltage dividing unit 20, and a filtering unit 26. The headphone interface circuit 16 includes an earphone jack 160 into which the earphone 19 is inserted and a switch unit 162 that detects whether or not the earphone 19 is inserted.
音頻介面10用於連接音頻源，以提供音頻訊號給功率放大單元12的訊號輸入端120。 The audio interface 10 is used to connect an audio source to provide an audio signal to the signal input terminal 120 of the power amplifying unit 12.
功率放大單元12用於接收音頻訊號，並對音頻訊號進行功率放大處理，並將處理後的音頻訊號分別輸出給揚聲器14、15及耳機插口160。具體地，功率放大單元12具有正相輸出端124、126及負相輸出端125、128。功率放大單元12分別藉由其正相輸出端124、126將音頻訊號提供給耳機插口160。功率放大單元12還分別藉由其正相輸出端124、負相輸出端125及正相輸出端126、負相輸出端128將音頻訊號提供給揚聲器14及揚聲器15。 The power amplifying unit 12 is configured to receive an audio signal, perform power amplification processing on the audio signal, and output the processed audio signal to the speakers 14, 15 and the earphone jack 160, respectively. In particular, power amplifying unit 12 has positive phase outputs 124, 126 and negative phase outputs 125, 128. The power amplifying unit 12 supplies the audio signal to the headphone jack 160 via its positive phase output terminals 124, 126, respectively. The power amplifying unit 12 also supplies audio signals to the speaker 14 and the speaker 15 through its normal phase output terminal 124, negative phase output terminal 125 and positive phase output terminal 126, and negative phase output terminal 128, respectively.
功率放大單元12還具有一控制端122。當控制端122的輸入電壓為低電平時，正相輸出端124、126分別輸出正相的音頻訊號給揚聲器14、15；負相輸出端125、128也分別輸出負相的音頻訊號給揚聲器14、15，反相的音頻訊號相互疊加，如此可提高揚聲器14、15播放聲音的音量。當控制端122的輸入電壓為高電平時，正相輸出端124、126分別輸出正相的音頻訊號給揚聲器14、15，負相 輸出端125、128分別輸出正相的音頻訊號給揚聲器14、15，同相的音頻訊號相互抵消，如此揚聲器14、15停止播放聲音。 The power amplifying unit 12 also has a control terminal 122. When the input voltage of the control terminal 122 is low, the positive phase output terminals 124, 126 respectively output the positive phase audio signals to the speakers 14, 15; the negative phase output terminals 125, 128 also output the negative phase audio signals to the speaker 14, respectively. 15, the inverted audio signals are superimposed on each other, so that the volume of the sound played by the speakers 14, 15 can be increased. When the input voltage of the control terminal 122 is at a high level, the positive phase output terminals 124, 126 respectively output the audio signals of the positive phase to the speakers 14, 15 and the negative phase. The output terminals 125, 128 respectively output the positive phase audio signals to the speakers 14, 15, and the in-phase audio signals cancel each other, so that the speakers 14, 15 stop playing the sound.
第一電解電容17的正極連接正相輸出端124，負極連接耳機插口160。第一電解電容17用於濾除從正相輸出端124輸入到耳機插口160的音頻訊號中的直流電壓成分。第二電解電容18的正極連接正相輸出端126，負極連接耳機插口160。第二電解電容18用於濾除從正相輸出端126輸入到耳機插口160的音頻訊號中的直流電壓成分。 The positive electrode of the first electrolytic capacitor 17 is connected to the positive phase output terminal 124, and the negative electrode is connected to the earphone jack 160. The first electrolytic capacitor 17 is for filtering out the DC voltage component in the audio signal input from the positive phase output terminal 124 to the headphone jack 160. The positive electrode of the second electrolytic capacitor 18 is connected to the positive phase output terminal 126, and the negative electrode is connected to the earphone jack 160. The second electrolytic capacitor 18 is for filtering out the DC voltage component in the audio signal input from the positive phase output terminal 126 to the earphone jack 160.
耳機插口160包括導電端164、165、接地端168。導電端164連接第一電解電容17的負極，導電端165連接第二電解電容18的負極，接地端168接地。導電端164、165分別通過第一電解電容17及第二電解電容18接收來自功率放大單元12的正相輸出端124、126輸出的音頻訊號。導電端164、165及接地端168用於在耳機19插入耳機插口160時將音頻訊號提供給耳機19，以播放聲音。 The earphone jack 160 includes conductive ends 164, 165 and a ground end 168. The conductive end 164 is connected to the negative electrode of the first electrolytic capacitor 17, the conductive end 165 is connected to the negative electrode of the second electrolytic capacitor 18, and the ground terminal 168 is grounded. The conductive ends 164, 165 receive the audio signals output from the positive phase output terminals 124, 126 of the power amplifying unit 12 through the first electrolytic capacitor 17 and the second electrolytic capacitor 18, respectively. The conductive ends 164, 165 and the ground end 168 are used to provide an audio signal to the earphone 19 when the earphone 19 is inserted into the earphone jack 160 to play the sound.
開關單元162在耳機19未插入耳機插口160時導通，並在耳機19插入耳機插口160時斷開。開關單元162包括接觸端166、169，接觸端166、169的一端連接在一起。接觸端166、169在耳機19未插入耳機插口160時，分別與導電端164、165電性連接。接觸端166、169還在耳機19插入耳機插口160時，分別與導電端164、165斷開連接。 The switch unit 162 is turned on when the earphone 19 is not inserted into the earphone jack 160, and is turned off when the earphone 19 is inserted into the earphone jack 160. Switch unit 162 includes contact ends 166, 169, one end of which is coupled together. The contact ends 166, 169 are electrically connected to the conductive ends 164, 165, respectively, when the earphones 19 are not inserted into the earphone jacks 160. The contact ends 166, 169 are also disconnected from the conductive ends 164, 165, respectively, when the earphone 19 is inserted into the earphone jack 160.
分壓單元20包括電源介面21，第一分壓單元22，第二分壓單元24及第三分壓單元25。第一分壓單元22與開關單元162連接，第二 分壓單元24及第三分壓單元25分別連接耳機插口160。第一分壓單元22還連接電源介面21，電源介面21連接直流電源V1。第一分壓單元22、第二分壓單元24及第三分壓單元25用於在開關單元162導通時共同對直流電源V1分壓，以產生第一電訊號。第一分壓單元22還用於在開關單元162斷開時單獨對直流電源V1分壓，以產生第二電訊號。在本實施例中，第一電訊號為低電平訊號，第二電訊號為高電平訊號。 The voltage dividing unit 20 includes a power supply interface 21, a first voltage dividing unit 22, a second voltage dividing unit 24, and a third voltage dividing unit 25. The first voltage dividing unit 22 is connected to the switching unit 162, and the second The voltage dividing unit 24 and the third voltage dividing unit 25 are respectively connected to the earphone jack 160. The first voltage dividing unit 22 is also connected to the power supply interface 21, and the power supply interface 21 is connected to the DC power supply V1. The first voltage dividing unit 22, the second voltage dividing unit 24, and the third voltage dividing unit 25 are used to collectively divide the DC power source V1 when the switching unit 162 is turned on to generate a first electrical signal. The first voltage dividing unit 22 is further configured to separately divide the DC power source V1 when the switching unit 162 is turned off to generate a second electrical signal. In this embodiment, the first electrical signal is a low level signal, and the second electrical signal is a high level signal.
第一分壓單元22包括第一電阻220。第一電阻220的一端連接接觸端166、169，另一端連接直流電源V1。第二分壓單元24包括第二電阻240。第二電阻240的一端連接於第一電解電容17的負極與導電端164之間，另一端接地。第三分壓單元25包括第三電阻250。第三電阻250的一端連接於第二電解電容18的負極與導電端165之間，另一端接地。 The first voltage dividing unit 22 includes a first resistor 220. One end of the first resistor 220 is connected to the contact ends 166, 169, and the other end is connected to the DC power source V1. The second voltage dividing unit 24 includes a second resistor 240. One end of the second resistor 240 is connected between the negative electrode of the first electrolytic capacitor 17 and the conductive end 164, and the other end is grounded. The third voltage dividing unit 25 includes a third resistor 250. One end of the third resistor 250 is connected between the negative electrode of the second electrolytic capacitor 18 and the conductive end 165, and the other end is grounded.
濾波單元26連接於開關單元162與控制端122之間，其用於濾除經開關單元162的控制端166、169傳輸給控制端122的音頻訊號。濾波單元26包括第四電阻260及電容262。第四電阻260連接於控制端122與接觸端166、169之間。電容262的一端連接於控制端122與第四電阻260之間，另一端接地。 The filtering unit 26 is connected between the switching unit 162 and the control terminal 122 for filtering the audio signal transmitted to the control terminal 122 via the control terminals 166 and 169 of the switching unit 162. The filtering unit 26 includes a fourth resistor 260 and a capacitor 262. The fourth resistor 260 is connected between the control terminal 122 and the contact terminals 166, 169. One end of the capacitor 262 is connected between the control terminal 122 and the fourth resistor 260, and the other end is grounded.
功率放大單元12根據其控制端122接收到的第一電訊號，通過其正相輸出端124、126及負相輸出端125、128分別輸出反相的音頻訊號給揚聲器14、15，如此揚聲器14、15播放聲音。功率放大單元12還根據其控制端122接收到的第二電訊號，通過其正相輸出端124、126及負相輸出端125、128分別輸出同相的音頻訊號給揚 聲器14、15，如此揚聲器14、15停止播放聲音。 The power amplifying unit 12 outputs the inverted audio signals to the speakers 14, 15 through the positive phase output terminals 124, 126 and the negative phase output terminals 125, 128 according to the first electrical signals received by the control terminal 122, such that the speaker 14 , 15 play the sound. The power amplifying unit 12 also outputs the in-phase audio signals through the positive phase output terminals 124 and 126 and the negative phase output terminals 125 and 128 according to the second electrical signals received by the control terminal 122. The sounders 14, 15 are such that the speakers 14, 15 stop playing sound.
電子裝置100的工作原理如下： The working principle of the electronic device 100 is as follows:
當電子裝置100通電且耳機19未插入耳機插口160中時，導電端165及接觸端166，導電端168及接觸端169分別電性連接。第一電阻220、第二電阻240及第三電阻250共同對直流電壓V1分壓，第二電阻240及第三電阻250並聯的電阻值小於第一電阻220的電阻值，如此第二電阻240分得的電壓為低電平電壓。在本實施例中，直流電源V1為5V，第一電阻220的阻值R1為100KΩ，第二電阻240的阻值R2為1KΩ，第三電阻250的阻值R3為1KΩ。如此，第二電阻240分得的電壓值，也即圖1中A點電壓值：VA=V1*R2//R3/(R1+R2//R3)=5*0.5/(100+0.5)V 0.02V When the electronic device 100 is powered on and the earphone 19 is not inserted into the earphone jack 160, the conductive end 165 and the contact end 166, the conductive end 168 and the contact end 169 are electrically connected. The first resistor 220, the second resistor 240 and the third resistor 250 collectively divide the DC voltage V1, and the second resistor 240 and the third resistor 250 have a resistance value that is smaller than the resistance value of the first resistor 220, such that the second resistor 240 The resulting voltage is a low level voltage. In the present embodiment, the DC power source V1 is 5V, the resistance R1 of the first resistor 220 is 100KΩ, the resistance R2 of the second resistor 240 is 1KΩ, and the resistance R3 of the third resistor 250 is 1KΩ. Thus, the voltage value of the second resistor 240, that is, the voltage value of point A in FIG. 1 : VA = V1 * R2 / / R3 / (R1 + R2 / / R3) = 5 * 0.5 / (100 + 0.5) V 0.02V
從功率放大單元12的正相輸出端124及126輸出的音頻訊號分別流經第一電解電容17及第二電解電容18到達導電端164、165。第一電解電容17及第二電解電容18具有隔直通交的作用，即濾除音頻訊號中的直流電壓成分。音頻訊號中的峰值電壓Vs在A點疊加，使得A點的電壓值VA 0.02+Vs。當音頻訊號的峰值電壓Vs過大(揚聲器14、15的音量過大)時，將導致A點電壓躍升為高電平電壓。第四電阻260及電容262構成的RC濾波電路用於濾除音頻訊號，以保證功率放大單元12的控制端122的輸入電壓為低電平電壓，即圖1中B點電壓VB為低電平電壓。如此，即使音頻訊號的峰值電壓Vs過大，也可保證控制端122的電壓VB為低電平電壓，從而使功率放大單元12輸出音頻訊號給揚聲器14、15，以播放聲音， 不會出現揚聲器發音會時斷時續的情況。 The audio signals output from the positive phase output terminals 124 and 126 of the power amplifying unit 12 respectively flow through the first electrolytic capacitor 17 and the second electrolytic capacitor 18 to the conductive terminals 164, 165. The first electrolytic capacitor 17 and the second electrolytic capacitor 18 have a function of blocking the direct current, that is, filtering out the DC voltage component in the audio signal. The peak voltage Vs in the audio signal is superimposed at point A such that the voltage value at point A is VA 0.02+Vs. When the peak voltage Vs of the audio signal is too large (the volume of the speakers 14, 15 is too large), the voltage at point A will jump to a high level voltage. The RC filter circuit formed by the fourth resistor 260 and the capacitor 262 is used for filtering the audio signal to ensure that the input voltage of the control terminal 122 of the power amplifying unit 12 is a low level voltage, that is, the voltage VB of the point B in FIG. 1 is a low level. Voltage. In this way, even if the peak voltage Vs of the audio signal is too large, the voltage VB of the control terminal 122 can be ensured to be a low level voltage, so that the power amplifying unit 12 outputs the audio signal to the speakers 14, 15 to play the sound. There will be no intermittent sounding of the speaker.
當將耳機19插入耳機插口160時，導電端165及接觸端166斷開連接，導電端168及接觸端169斷開連接。直流電壓V1通過第一電阻220及第四電阻260對電容262進行充電，充電時間為T=(R1+R4)*C1，只要R1、R4、C1取值合適，即可達到聲音從揚聲器14、15輸出到從耳機19輸出的快速切換，不會出現延遲現象。在本實施例中，第四電阻260的阻值R4為100KΩ，電容262的電容值C1為0.01uF。如此，充放電時間：T=(R1+R4)*C1=200*103*0.01*10-6s=2ms When the earphone 19 is inserted into the earphone jack 160, the conductive end 165 and the contact end 166 are disconnected, and the conductive end 168 and the contact end 169 are disconnected. The DC voltage V1 charges the capacitor 262 through the first resistor 220 and the fourth resistor 260, and the charging time is T=(R1+R4)*C1. As long as the values of R1, R4, and C1 are appropriate, the sound can be heard from the speaker 14. 15 output to the fast switching from the output of the headphone 19, there is no delay. In the present embodiment, the resistance R4 of the fourth resistor 260 is 100 KΩ, and the capacitance value C1 of the capacitor 262 is 0.01 uF. Thus, the charge and discharge time: T = (R1 + R4) * C1 = 200 * 10 3 * 0.01 * 10 -6 s = 2ms
充電完畢，控制端的電壓VB處於高電平狀態，如此，功率放大單元12分別藉由其正相輸出端124、負相輸出端125及正相輸出端126、負相輸出端128輸出給揚聲器14及揚聲器15的同相音頻訊號相互抵消，揚聲器14、15停止播放聲音。功率放大單元12的正相輸出端124、126將音頻訊號通過耳機插口160提供給耳機19以播放聲音。在2ms時間內，使用者不會察覺出聲音的延遲。 After the charging is completed, the voltage VB of the control terminal is in a high state. Thus, the power amplifying unit 12 outputs the positive phase output terminal 124, the negative phase output terminal 125, the positive phase output terminal 126, and the negative phase output terminal 128 to the speaker 14 respectively. The in-phase audio signals of the speaker 15 cancel each other out, and the speakers 14, 15 stop playing the sound. The positive phase outputs 124, 126 of the power amplifying unit 12 provide audio signals to the earphones 19 through the headphone jack 160 for playing sound. In 2ms, the user will not notice the delay of the sound.
綜上該，本發明符合發明專利要件，爰依法提出專利申請。惟，以上該僅為本發明的較佳實施方式，舉凡熟悉本案技藝的人士，在爰依本案創作精神所作的等效修飾或變化，皆應包含於以下的申請專利範圍內。 In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above is only a preferred embodiment of the present invention, and those skilled in the art will be able to include equivalent modifications or variations in the spirit of the present invention.
100‧‧‧電子裝置 100‧‧‧Electronic devices
12‧‧‧功率放大單元 12‧‧‧Power amplification unit
16‧‧‧耳機介面電路 16‧‧‧ headphone interface circuit
18‧‧‧第二電解電容 18‧‧‧Second electrolytic capacitor
20‧‧‧分壓單元 20‧‧‧Voltage unit
22‧‧‧第一分壓單元 22‧‧‧First partial pressure unit
25‧‧‧第三分壓單元 25‧‧‧ Third pressure division unit
120‧‧‧訊號輸入端 120‧‧‧Signal input
124、126‧‧‧正相輸出端 124, 126‧‧ ‧ positive phase output
160‧‧‧耳機插口 160‧‧‧ headphone jack
164、165‧‧‧導電端 164, 165‧‧‧ conductive end
166、169‧‧‧接觸端 166, 169‧‧‧ contact end
V1‧‧‧直流電源 V1‧‧‧DC power supply
250‧‧‧第三電阻 250‧‧‧ third resistor
262‧‧‧電容 262‧‧‧ Capacitance
10‧‧‧音頻介面 10‧‧‧Audio interface
14、15‧‧‧揚聲器 14, 15‧‧‧ Speakers
17‧‧‧第一電解電容 17‧‧‧First electrolytic capacitor
19‧‧‧耳機 19‧‧‧ headphones
21‧‧‧電源介面 21‧‧‧Power interface
24‧‧‧第二分壓單元 24‧‧‧Second voltage division unit
26‧‧‧濾波單元 26‧‧‧Filter unit
122‧‧‧控制端 122‧‧‧Control terminal
125、128‧‧‧負相輸出端 125, 128‧‧‧ Negative phase output
162‧‧‧開關單元 162‧‧‧Switch unit
168‧‧‧接地端 168‧‧‧ Grounding terminal
220‧‧‧第一電阻 220‧‧‧First resistance
240‧‧‧第二電阻 240‧‧‧second resistance
260‧‧‧第四電阻 260‧‧‧fourth resistor
Claims (11)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW97125414A TWI420915B (en) | 2008-07-04 | 2008-07-04 | Electronic apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW97125414A TWI420915B (en) | 2008-07-04 | 2008-07-04 | Electronic apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TW201004390A TW201004390A (en) | 2010-01-16 |
| TWI420915B true TWI420915B (en) | 2013-12-21 |
Family
ID=44825874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW97125414A TWI420915B (en) | 2008-07-04 | 2008-07-04 | Electronic apparatus |
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| Country | Link |
|---|---|
| TW (1) | TWI420915B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201789630U (en) | 2010-09-08 | 2011-04-06 | 中兴通讯股份有限公司 | Headset plugging detection circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6321278B1 (en) * | 1998-09-14 | 2001-11-20 | Compaq Computer Corporation | Automatically detecting a connection into a computer system standardized connector for disabling a front speaker |
| TW595239B (en) * | 2003-01-28 | 2004-06-21 | Htc Corp | Detection circuit to detect the earphone type plugged into the insertion hole |
| TW200507679A (en) * | 2003-08-15 | 2005-02-16 | Kinpo Elect Inc | Detection device and method of audio/video interface socket and earphone wire socket mutually in sharing |
-
2008
- 2008-07-04 TW TW97125414A patent/TWI420915B/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6321278B1 (en) * | 1998-09-14 | 2001-11-20 | Compaq Computer Corporation | Automatically detecting a connection into a computer system standardized connector for disabling a front speaker |
| TW595239B (en) * | 2003-01-28 | 2004-06-21 | Htc Corp | Detection circuit to detect the earphone type plugged into the insertion hole |
| TW200507679A (en) * | 2003-08-15 | 2005-02-16 | Kinpo Elect Inc | Detection device and method of audio/video interface socket and earphone wire socket mutually in sharing |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201004390A (en) | 2010-01-16 |
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