200922362 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種音頻轉接裝置。 【先前技術】 目前’耳機被廣泛應用在各種音頻設備上，如手機、 MP3等’而且耳機之音頻介面種類也愈來愈多，如傳統 2.5mm/3.5mm音頻介面、miniusB音頻介面等。為方便用 戶使用之耳機能適應各種音頻介面，通常會設計音頻轉接 裝置，以實現各種音頻介面之間之轉接，但習知之音頻轉 接裝置僅僅是實現對音頻訊號之轉接，功能十分單一，不 能滿足用戶之其他需求，例如有些用戶在使用耳機時婉常 是兩個人分別各帶耳機上之一個耳塞來聽音樂，但音量不 ，根據每個人之意願調節，只能同時調節兩個耳^之立 置’很難同時滿足兩個人之需求。另夕卜，有些耳機之立^ 過小，經常不能滿足使用者之需要。 曰里 【發明内容】 頻介面、—第二音頻介面、一第_放大器、 ： -第-可變電阻器及一第二可變電阻 放大 及第二音頻介面分別包括一左耳道音頻“=頻1 頻㈣及-接地引腳，該第二音頻介面還包二 200922362 腳’該第-音頻介面之接地5丨腳 引腳相連，該第二音頻 ，、弟—曰頻介面之接地 大器之同相輸入端相連，^電源引聊與該第—及第二放 ^ 第二音艏公 腳依次透過一第一電容及一 之左耳道音頻引 突士人 弟—限流電阻後盥該第一姑士 為之反相輸入端相連’該第 二4放大 大器之反相輸入端與輸出端之間文聯於該第一放 透過-第二電容與該第一音頻’人:亥弟：放大器之輸出端 連，隹9頻〗丨面之左耳道音頻引腳相 相連，該第二音頻介面之右；=一音頻介面之接地引腳 丨囱之右耳迢音頻引腳依次 電容及一第二限流電阻後盥 弟一 L: 器串聯於該第二放大器之反相輸入端 /、輸出知之間，該第-姑士怒 ^ σσ之輸出端透過一第四電容與 該第一音頻介面之右耳道音頻引腳相連，還透過一第二限 位％阻與該第一音頻介面之接地引腳相連。 相較習知技術，該第一及第二放大器可將音頻訊號放 大，並透過調節該第一可變電阻器及第二可變電阻器之電 阻值，即可分別調節與其相連之耳機上左右耳塞之音量， 十分方便’滿足了用戶對此方面之需求。 【實施方式】 請一併參考圖1至圖3，本發明具音量調節功能之音 頻轉接裝置之較佳實施方式包括一第一音頻介面1〇、一本 體部20、一第二音頻介面3〇、一第一按鈕21、一第二按 鈕22 ' —第一限流電阻23、一第二限流電阻24、一第一 可變電阻器25、一第二可變電阻器26、一第一放大器Α1、 200922362 一第一放大器A2、一第一限位電阻27、一第二限位電阻 28、五個電容C1〜C5及一電感L。其中，該第一限流電 阻23、第二限流電阻24、第一可變電阻器25及第二可變 電阻器26之電阻值分別設定為Ri、r2、R3及R4。 該第一音頻介面10包括一左耳道音頻引腳14、一右 耳道音頻引腳16及一接地引腳18，該第二音頻介面3〇包 括一電源引腳32、一左耳道音頻引腳34、一右耳道音頻引 腳36及一接地引腳38。本實施方式中，該第一音頻介面 10及第二音頻介面3〇分別以一 3.5mm音頻介面及一 miniUSB音頻介面舉例加以說明，該第—音頻介面1〇及第 二音頻介面30也可以是其他類型之音頻介面，具體可根據 實際需要進行設計。該第—㈣21、第二按紐22為旋轉 式按鈕，也可以選用其他類型具有同樣功能之按鈕。 該第一音頻介面10及第二音頻介面3〇分別設於該本 體部20相對之兩端，該第一按紐21及第二按紐22分別設 於邊本體部20㈣之兩側，其他電子元件均設於該本體部 山之、内邛。5玄第一按鈕21與該第一可變電阻器25之調節 ::連’用於調節該第—可變電阻器25之電阻值。該第二 :22與該第二可變電阻器％之調節端相連，用於調節 該弟—可變電阻器26之電阻值。 30之'接二，曰頻;1 ^ 1〇之接地引腳18與該第二音頻介面 透相連。該第二音頻介面30之電源引腳32 =電感L分別與該第—及第二放大器AUA2之同相 相連，還透過該電容C5與該接地引腳38相連。該 9 200922362 'I μ 一 ’員；1面30之左耳道音頻引腳34依次透過該電容ci 弟^限流電阻23後與該第一放大器Ak反相輸入端相 =、亥弟-可變電阻器25串聯於該第一放大器ai之反相 與輸出端之間。該第一放大器A1之輸出端透過該 二谷C2與該第一音頻介面1〇之左耳道音頻引腳μ相連， 還透過該第—限位電阻27與該第—音頻介面10之接地引 腳18相連。該第二音頻介面3〇之右耳道音頻引腳％依次 ’透匕該电谷C3及第二限流電阻24後與該第二放大器A: 之=相輸入端相連，該第二可變電阻器26串聯於該第二放 大„。Α2之反相輸入端與輸出端之間。該第二放大器八2之 輸出端透過該電容C4與該第—音頻介面1()之右耳道音頻 引腳16相連，還透過該第二限位電阻與該第一音頻介 面1〇之接地引腳18相連。 其中，該等電容C1、C2、C3及以用於將音頻訊號 中之直流部分濾除，以降低直流雜訊干擾。該第一及第二 L限位電阻27及28用於限定該第一音頻介面1〇上左、右耳 道音頻引腳之輸出電壓符合音頻電壓輸出要求。該電容c5 及電感L組成濾波電路，為該第二音頻介面3〇中電源引 腳32輸出之電壓進行濾波，也可根據需要將其刪除，以降 低成本，即直接將該電源引腳32與該第一及第二放大器 A1及A2之同相輸入端相連即可。該第一放大器A1用於 將该左耳道音頻引腳34輸入到該左耳道音頻引腳14之音 頻訊號進行放大，其放大倍數N1 = R3/R1，可透過調節該 第一可變電阻器25之電阻值R3之大小來自由調整放大倍 200922362 數。同理’該第二放大|§A2用於將該右耳道音頻引腳％ -輸入到該右耳道音頻引腳16之音頻訊號進行放大，其放大 倍數N2 = R4/R2,可透過調節該第二可變電阻器％之電阻 值R4之大小來自由調整放大倍數，以滿足不同用戶之需 要。 當應用該具音量調節功能之音頻轉接裝置時，將一耳 機音頻連接器（如3.5mm音頻連接器）與該第一音頻介面 ,10相連’再將該第二音頻介面30與一音頻設備之音頻連 接器（如手機之miniusB音頻連接器）連接後，該音頻設 備之内部電源透過其音頻連接器給該第二音頻介面3 電源引腳32供電，以使該第-及第二放大器AUA2i =從而使耳機收聽到該音頻設備發出之音頻訊 耳塞:織兩個使用者使用時，使用左耳塞： 之電阻值，進而調節左耳二f可變電… 二使用者可透㈣第二独22㈣里❹右耳塞之 之電阻值，進而調節：耳二11:㈣二可變電阻器-者㈣立旦〃户斗墓之曰里大小，從而使兩個使用 過干擾’同時也克服了有些耳機自身音量 之缺點，給使用者帶來了方便。 紅上所述，本發明符合發明專利 利申請。惟，以卜辦、土 Μ、 千犮依法鮝出專 斤这者僅為本發明之較佳奮 凡熟悉本案技蓺之人+如《 早乂1 土只轭方式，舉 娜或變化，皆Sir 本發明精神所作之等效修 :化白應㊆盖於以下之申請專利範圍内。 【圖式簡單說明】 11 200922362 圖1係本發明具音量調節功能之音頻轉接裝置較佳實 施方式之立體圖。 圖2係圖1之俯視圖。 圖3係圖1音頻轉接裝置之内部電路圖。 【主要元件符號說明】 第—音頻介面 10 左耳道音頻引腳 14、34 右耳道音頻引腳 16、 36接地引腳 18、38 第二音頻介面 30 電源引腳 32 第一限流電阻 23 第二限流電阻 24 第一可變電阻器 25 第二可變電阻器 26 第一限位電阻 27 第二限位電阻 28 第—放大器 A1 第二放大器 A2 電感 L 電容 C1 、C2、C3、C4、C5 12200922362 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to an audio switching device. [Prior Art] At present, 'headphones are widely used in various audio devices, such as mobile phones, MP3s, etc.' and there are more and more types of audio interfaces for headphones, such as the traditional 2.5mm/3.5mm audio interface and miniusB audio interface. In order to facilitate the user's use of headphones to adapt to a variety of audio interfaces, audio switching devices are usually designed to achieve switching between various audio interfaces, but the conventional audio switching device is only for the transfer of audio signals, the function is very Single, can not meet the other needs of users, for example, some users often use two earphones to listen to music when using headphones, but the volume is not, according to each person's wishes, can only adjust two at the same time It’s difficult to meet the needs of two people at the same time. In addition, some headphones are too small to meet the needs of users.曰里[Abstract] The frequency interface, the second audio interface, a first _ amplifier,: - the first variable resistor and a second variable resistance amplification and the second audio interface respectively comprise a left ear canal audio "= Frequency 1 frequency (four) and - ground pin, the second audio interface is also included in the 200922362 pin 'the first audio interface ground 5 foot pin connected, the second audio, the brother - the frequency interface of the grounding device Connected to the non-inverting input, ^ power supply chat and the first and second release ^ second sound 艏 public foot through a first capacitor and a left ear canal audio lead guide brother - current limiting resistor The first priest is connected to the inverting input terminal. The second 4th amplifier is connected between the inverting input terminal and the output terminal, and the first speaker is transmitted through the second capacitor with the first audio 'person: Haidi : The output end of the amplifier is connected, the left ear canal audio pin of the 隹9 frequency 丨 face is connected, the second audio interface is right; = the grounding pin of an audio interface 丨 之 之 right ear 迢 audio pin in turn capacitor And a second current limiting resistor, the latter is connected to the second amplifier Between the input terminal and the output terminal, the output end of the first aunt anger σσ is connected to the right ear canal audio pin of the first audio interface through a fourth capacitor, and is further blocked by a second limit The grounding pins of the first audio interface are connected. The first and second amplifiers can amplify the audio signals and adjust the resistance values of the first variable resistor and the second variable resistor by using a conventional technique. The volume of the left and right earplugs on the earphones connected thereto can be adjusted separately, which is very convenient to meet the needs of the user. [Embodiment] Please refer to FIG. 1 to FIG. 3 together, and the audio transfer with volume adjustment function of the present invention is provided. The preferred embodiment of the device includes a first audio interface 1 , a body portion 20 , a second audio interface 3 , a first button 21 , a second button 22 ′ — a first current limiting resistor 23 , a first The second current limiting resistor 24, a first variable resistor 25, a second variable resistor 26, a first amplifier Α1, 200922362, a first amplifier A2, a first limiting resistor 27, and a second limiting terminal Resistor 28, five capacitors C1~C5 and one inductor L The resistance values of the first current limiting resistor 23, the second current limiting resistor 24, the first variable resistor 25, and the second variable resistor 26 are respectively set to Ri, r2, R3, and R4. The interface 10 includes a left ear canal audio pin 14, a right ear canal audio pin 16 and a ground pin 18, and the second audio interface 3 includes a power pin 32 and a left ear canal audio pin 34. a right ear canal audio pin 36 and a grounding pin 38. In the embodiment, the first audio interface 10 and the second audio interface 3 are respectively illustrated by a 3.5 mm audio interface and a miniUSB audio interface. The first audio interface 1 and the second audio interface 30 can also be other types of audio interfaces, and can be designed according to actual needs. The first (four) 21, the second button 22 is a rotary button, and other types of buttons having the same function can also be selected. The first audio interface 10 and the second audio interface 3 are respectively disposed at opposite ends of the main body portion 20, and the first button 21 and the second button 22 are respectively disposed on two sides of the side body portion 20 (four), and other electronic components The components are all located in the inner part of the body. The adjustment of the first first button 21 and the first variable resistor 25 is used to adjust the resistance value of the first variable resistor 25. The second: 22 is connected to the adjustment terminal of the second variable resistor % for adjusting the resistance value of the differential resistor 26. 30'' is connected to the second audio interface; the 1^1〇 ground pin 18 is connected to the second audio interface. The power pin 32 of the second audio interface 30 = the inductor L is connected to the first and second amplifiers AUA2, respectively, and is also connected to the ground pin 38 through the capacitor C5. The 9 200922362 'I μ one' member; 1 side 30 left ear canal audio pin 34 through the capacitor ci ^ ^ ^ current limiting resistor 23 and the first amplifier Ak inverting input phase =, Haidi - can The variable resistor 25 is connected in series between the inverting and output terminals of the first amplifier ai. The output end of the first amplifier A1 is connected to the left ear canal audio pin μ of the first audio interface 1 through the two valleys C2, and is also grounded through the first limit resistor 27 and the first audio interface 10 The feet 18 are connected. The right ear canal audio pin % of the second audio interface 3 is sequentially connected to the second amplifier A: the phase input terminal through the electric valley C3 and the second current limiting resistor 24, the second variable The resistor 26 is connected in series between the inverting input terminal and the output terminal of the second amplification device 。2. The output terminal of the second amplifier 八2 transmits the right ear canal audio of the first audio interface 1 and the first audio interface 1 () The pin 16 is connected to the ground pin 18 of the first audio interface through the second limit resistor. The capacitors C1, C2, and C3 are used to filter the DC portion of the audio signal. In addition, to reduce DC noise interference, the first and second L limit resistors 27 and 28 are used to define the output voltage of the left and right ear canal audio pins of the first audio interface 1 to meet the audio voltage output requirement. The capacitor c5 and the inductor L form a filter circuit for filtering the voltage outputted by the power pin 32 of the second audio interface 3, or can be deleted as needed to reduce the cost, that is, directly connecting the power pin 32 with The non-inverting input terminals of the first and second amplifiers A1 and A2 may be connected. The first amplifier A1 is used for amplifying the left ear canal audio pin 34 to the audio signal of the left ear canal audio pin 14 for amplification, and the amplification factor is N1 = R3/R1, and the first variable resistor can be adjusted The magnitude of the resistance value R3 of 25 is derived from the adjustment magnification 200922362. Similarly, the second amplification|§A2 is used to input the right ear canal audio pin %- to the audio signal of the right ear canal audio pin 16. The amplification is performed, and the amplification factor N2 = R4/R2 can be adjusted by adjusting the amplification value of the second variable resistor % to meet the needs of different users. When applying the volume adjustment function In the audio switching device, a headphone audio connector (such as a 3.5mm audio connector) is connected to the first audio interface 10, and then the second audio interface 30 and an audio device of the audio device (such as a mobile phone) After the miniusB audio connector is connected, the internal power of the audio device supplies power to the second audio interface 3 power pin 32 through its audio connector, so that the first and second amplifiers AUA2i = so that the earphone listens to the audio Equipment Audio audio earplugs: When weaving two users, use the left earplug: the resistance value, and then adjust the left ear two f variable electric... The second user can pass (4) the second unique 22 (four) inner right earplug resistance value And then adjust: ear two 11: (four) two variable resistors - (four) Lidan size of the tomb in the tomb, so that the two used interference 'at the same time also overcome the shortcomings of some headphones themselves, the user The invention is in accordance with the invention patent application. However, it is only the preferred method of the present invention that the invention is based on the law, the bandits, and the millennium. People + such as "Early 乂 1 soil yoke method, lift or change, are the equivalent of Sir's spirit of the invention: Huabai should be covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS 11 200922362 FIG. 1 is a perspective view of a preferred embodiment of an audio switching device with a volume adjustment function according to the present invention. Figure 2 is a plan view of Figure 1. 3 is an internal circuit diagram of the audio switching device of FIG. 1. [Main component symbol description] The first audio interface 10 left ear canal audio pin 14, 34 right ear canal audio pin 16, 36 ground pin 18, 38 second audio interface 30 power pin 32 first current limiting resistor 23 Second current limiting resistor 24 first variable resistor 25 second variable resistor 26 first limiting resistor 27 second limiting resistor 28 first amplifier A1 second amplifier A2 inductor L capacitor C1, C2, C3, C4 , C5 12