200822673 ia^uoui^7.TW 21718twf.doc/n 九、發明說明： 【發明所屬之技術領域】 本發明是關於一種環境噪音過濾方法和裝置，特 關於一種能夠解決外部環境噪音對手持通訊裝置之渴」= 質所造成之影響的方法和裝置。 、活品 【先前技術】 c o 近年來，隨著電子科技與製造技術的不斷演進及 具人性化、功能性佳的資訊產品亦—直推陳出新。而 由於現今生活步調加速’通财式必㈣求時效曰— 動電話憑藉其可卿性及制性，已逐漸取代以往傳3 活’成為人與人之間最制、最快速的通訊工具。人們二 ，過行動電話做即時通訊，而不受時間、地點的限制。= =卜目前行動電話通話時的聲音品質及穩定 :效:能提:二 境7抑或是在心200822673 ia^uoui^7.TW 21718twf.doc/n IX. Description of the Invention: [Technical Field] The present invention relates to an environmental noise filtering method and apparatus, and relates to a handheld communication device capable of solving external environmental noise Thirst" = methods and devices for the effects of quality. [Previous technology] c o In recent years, with the continuous evolution of electronic technology and manufacturing technology and the humanized and functional information products, it has also been straightforward. And because of the accelerated pace of life in today's life, the singularity of the stipulations of the stipulations of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity of the past. People second, mobile phones do instant messaging, regardless of time or place. = = Bu sound quality and stability during current mobile phone calls: Effectiveness: Can mention: 2 or 7 in the heart
其說話的聲音和周圍環境的嗓音都會二S 是在!ΪΓ並透過通訊連結傳到接聽者的耳朵裏。如果 響還不的環境中’環境澡音較小，對通話品質的影 ;車駛η?:如果旁邊是喧囂的人群或者是有隆隆的 、、二接ι者就很難聽得清楚發話者的聲音。 行的種解決方案是在行動電話中設置一個聲音振 200822673 i^wuv^i*+7.TW 21718twf.doc/n =的門檻值，當聲音中單，率的振幅大於朗檀 屬於該鮮鱗音才會被倾，如㈣音彳M、且其振幅沒 有超過Η檻值時’料就會先除，_品f就能提高。 =若。呆音相當大且超·檻值時，這㈣音仍然會被傳 輸，結果還是無法根本解決噪音干擾的問題。 【發明内容】 (、 有鑑於此，本發明的目的就是在提供_種環境噪音過 L裝置及方法，而能夠大幅削弱外部噪音 響，進而提高通話品質。 為達上述或其他目的’本發明提出—種環境噪音過遽 裝置’其包括-個第-收音設備、—個第二收音設備，及 :個差分放大電路。其中，第—收音設備制於採集一環 呆音喊’而第三收音設制驗採集包含此環境噪音 訊號的通話聲音域。差分放大電路係與上述第―收音設 備及第二收音設備連接，而適於將環境噪音訊號與通ς = 音訊遽的差值放大後輸出。 、依照本發明的較佳實施例所述環境噪音過濾裝置，上 述之苐收θ 5又備及该第二收音設備均為麥克風。 依照本發明的較佳實施例所述環境噪音過濾裝置，其 中第:收音設備餘置在麟—個音源―長度的ς 置’第二收音設備則放置在距離此音源—第二長度的位 置，而此第一長度係大於第二長度。 依照本發明的較佳實施例所述環境噪音過濾裝置，上 200822673 x^u^x47.TW 21718twf.doc/n ，之差士放大電路包括一放大器電路、一個減法器及一個 P:直電合。其中，放大器電路係連接在第一收音設備及第 音設備的輸出端，適於將環境噪音訊號及包含該環境 噪音t通話聲音訊號放大，減法器則連接在放大器電路的 ，出端’適於將環境噪音訊號與通話聲音訊號相減，而獲 二差?職。隔直電容係連接在減法11的輸出端，適於 攸減法器輸出的差值訊號中篩選出一交流訊號，並輸出此 交流訊號。 …依照本發明的較佳實施例所述環境噪音過濾裝置，上 述之放大斋電路係由一個第一運算放大器及一個第二運算 ^大裔並，而成，其中第—運算放大器係連接至第一收音 u又備，而第二運算放大器係連接至第二收音設備。 依照本發明的較佳實施例所述環境噪音過濾裝置，上 述之減法器為一運算放大器。 狀本發明提出一種環境噪音過濾方法，適用於手持通訊 而適於消除環境°喿音對手持通訊裝置之通話品質的 二此方法包括下列步驟：分別使用第一收音設備及第 設備採集環境噪音訊號及包含此環境噪音訊號的通 活聲音^虎。才妾著，將此環境噪音訊號與通話聲音訊號相 減，獲彳于一差值訊號。最後則放大此差值訊號。 ^照本發明的較佳實施例所述環境噪音過濾方法，更 ^括從放大之差值訊號中筛選出一交流訊號，以及將這個 父流訊號轉換為一數位通話聲音訊號。 本發明係利用兩個收音設備分別接收環境噪音訊號和 200822673 ia^ouwT.TW 2l718twf.doc/n 包含環境噪音訊號的通話聲音訊號，並藉由一差分放大器 將裱境噪音訊號和通話聲音訊號相減以除掉環境噪音訊 唬。相較於先前技術，本發明簡便有效，不會產生多餘的 系統開銷，並可用於各種使用麥克風的通話系統。 ▲為讓本發明之上述和其他目的、特徵和優點能更明顯 易丨董下文特舉較佳貫施例，並配合所附圖式，作詳細說 明如下。 ' 口 【實施方式】 為了使本發明之内容更為明瞭，以下特舉實施例作為 本發明確實能夠據以實施的範例。 圖1是依照本發明較佳實施例所繪示的環境噪音過濾 系統方塊圖。請參照圖i，本實施例之噪音過渡系統包ς °呆音過濾裝置1 ’其包括兩個麥克風1〇、u和與之連接 差分放大電路12。其巾，麥歧1G係放在離通話者 近的位置’以接收通話者的聲音，其實際接㈣的聲立^ 號，純淨的通話聲音喊和環境噪音訊號的疊加，即二 了％境％音訊號的通話聲音訊號。相對於麥克風，失= 風11是放在距離通話者比較遠的位置，或是面對與通ζ 方向相反的方向’以接收周圍環境㈣音訊號(因’聲立右 向比如放置在特通訊裝置背面或者手持通訊1 聽筒背面等，可依其具體結構而定。 、 此外，差分放大電路U係連接在兩個麥克風忉 之後，將接收到的環境嗓音訊號以及包含環境 聲音訊號相減以除掉環境噪音訊號，得到純淨的 200822673 ia^uoui^7.TW 21718twf.doc/n 訊號’並將其放大後輸出。 值得一提的是，噪音過濾裝置1後面還可連接音頻處 理晶片2和聲音播放設備3(比如揚聲器或耳機等）。^ 頻處理晶片2可以將聲音類比訊號轉換成數位通話聲音二 號並進行訊號處理，而聲音播放設備3則是用以將處二後 的數位通話聲音訊號播放出來。 圖2是依照本發明較佳實施例所繪示的差分放大電路 的具體電路圖。如圖2所示，差分放大電路12包括一個由 兩個運算放大器121、122並聯而成的放大器電路12〇、— 個串聯在放大器電路120之後的減法器123，以及一個隔 直電容124。 m 請同時參照圖1及圖2,運算放大器122的輸入端連接 到接收通話聲音訊號用的麥克風1〇，輸出端的電壓負反饋 到自身的反相輸入端。類似地，運算放大器121的輸入端 連接到接收環i兄。喿音訊號用的麥克風Η，輸出端的電壓負 反饋到自身的反相輸入端。放大器電路12〇具有高輸入阻 〇 抗和低輸出阻抗，且輸入訊號與輸出訊號的相位相同。 在本實施例中，減法器123也是一個集成運算放大器， 其輸入端分別連接運算放大器121和122的輸出端，而用 以接收環境噪音訊號和包含環境噪音訊號的通話聲音訊 號，並輸出這兩個訊號相減的一個差值訊號。減法器123 的輸出端則連接隔直電容124,此隔直電容124係用以從 此差值汛號中篩選出交流訊號，並送往音頻處理晶片2 理。 9 200822673 ia^uou 1 ^7.TW 21718twf.doc/n 由於麥克風ίο所接收的訊號是環境噪音訊號和純淨通 話聲音訊號的疊加，而麥克風11所接收的訊號只有環境噪 音訊號，因此將這兩個訊號經減法器電路相減之後，就可 以得到純淨的通話聲音訊號，從而達到了將噪音過濾、的目 的0 ΟThe voice of the voice and the voice of the surrounding environment will be in the same place! It will be transmitted to the recipient's ear through the communication link. If the environment is not good, the environmental bathing sound is small, and the quality of the call is good; the car is driving η?: If there is a crowd of people next to it or if there is a rumbling, it is difficult to hear the speaker. sound. The kind of solution is to set a threshold value of sound vibration 200822673 i^wuv^i*+7.TW 21718twf.doc/n = in the mobile phone. When the sound is single, the amplitude of the rate is greater than that of Langtan. The sound will be tilted, such as (four) sound 彳 M, and its amplitude does not exceed the Η槛 value, 'material will be removed first, _ product f can be improved. = if. When the tone is quite large and the value is too high, the (four) tone will still be transmitted, and the result is still unable to solve the problem of noise interference. SUMMARY OF THE INVENTION (In view of the above, an object of the present invention is to provide an apparatus and method for environmental noise over L, which can greatly reduce external noise and improve call quality. For the above or other purposes, the present invention proposes - an environmental noise smashing device 'which includes - a first - radio device, a second radio device, and a differential amplifying circuit. Among them, the first - radio device is used to collect a ring of voices and the third radio set The test acquires a call sound field including the ambient noise signal, and the differential amplifier circuit is connected to the first sound pickup device and the second sound pickup device, and is adapted to amplify and output the difference between the ambient noise signal and the overnight sound signal. According to a preferred embodiment of the present invention, the environmental noise filtering device, wherein the θ 5 is further provided, and the second sound receiving device is a microphone. The environmental noise filtering device according to the preferred embodiment of the present invention, wherein The first: the radio equipment is placed in the lining-one source-length ' 'the second radio equipment is placed at the second length from the sound source, and the first length The degree system is greater than the second length. According to the preferred embodiment of the present invention, the environmental noise filtering device, 200822673 x^u^x47.TW 21718twf.doc/n, the differential amplifier circuit includes an amplifier circuit and a subtractor And a P: direct current connection, wherein the amplifier circuit is connected to the output end of the first sound collecting device and the sound device, and is suitable for amplifying the environmental noise signal and the voice signal including the ambient noise t, and the subtractor is connected to the amplifier The output of the circuit is adapted to subtract the ambient noise signal from the voice signal of the call, and the difference is obtained. The DC-blocking capacitor is connected to the output of the subtraction 11 and is suitable for filtering the difference signal of the output of the subtractor. An alternating current signal is outputted, and the alternating current signal is output. According to the environmental noise filtering device of the preferred embodiment of the present invention, the amplifying circuit is a first operational amplifier and a second operational The first operational amplifier is connected to the first radio, and the second operational amplifier is connected to the second radio. The environment according to the preferred embodiment of the present invention. The noise filtering device, the above-mentioned subtractor is an operational amplifier. The present invention provides an environmental noise filtering method suitable for handheld communication and suitable for eliminating the environmental quality of the call quality of the handheld communication device. The method includes the following steps: The first sound-receiving device and the first device are used to collect the ambient noise signal and the pass-through sound including the ambient noise signal. The environmental noise signal is subtracted from the call sound signal to obtain a difference signal. Finally, the difference signal is amplified. The ambient noise filtering method according to the preferred embodiment of the present invention further includes filtering an alternating signal from the amplified difference signal and converting the parent stream signal into a digit. The voice signal is transmitted by the present invention. The invention uses two sound receiving devices to respectively receive an environmental noise signal and a call sound signal including an environmental noise signal, and the noise signal is transmitted by a differential amplifier. The call voice signal is subtracted to remove the ambient noise. Compared with the prior art, the present invention is simple and effective, does not generate redundant system overhead, and can be used in various call systems using microphones. The above and other objects, features, and advantages of the present invention will become more apparent from the aspects of the appended claims. [Embodiment] In order to clarify the content of the present invention, the following specific examples are given as examples in which the present invention can be implemented. 1 is a block diagram of an ambient noise filtering system in accordance with a preferred embodiment of the present invention. Referring to Figure i, the noise transition system of the present embodiment includes a two microphones 1 , u and a differential amplifying circuit 12 connected thereto. Its towel, Maiqi 1G is placed close to the caller's position to receive the voice of the caller, the actual connection (4) of the sound of the number, the pure call voice and the environmental noise signal superposition, that is, the second The audio signal of the % audio signal. Relative to the microphone, the loss = wind 11 is placed far away from the caller, or facing the direction opposite to the overnight direction to receive the surrounding environment (four) audio signal (because the sound is right, such as placed in the special communication The back of the device or the back of the handset 1 handset can be determined according to its specific structure. In addition, the differential amplifier circuit U is connected to the two microphones, and the received ambient sound signal and the ambient sound signal are subtracted. The environmental noise signal is removed, and the pure 200822673 ia^uoui^7.TW 21718twf.doc/n signal 'is amplified and output. It is worth mentioning that the noise filtering device 1 can also be connected with the audio processing chip 2 and the sound. The playback device 3 (such as a speaker or a headphone, etc.). The frequency processing chip 2 can convert the sound analog signal into a digital call voice number 2 and perform signal processing, and the sound playback device 3 is used to place the second digit of the call sound. The signal is played out. Figure 2 is a specific circuit diagram of a differential amplifying circuit according to a preferred embodiment of the present invention. As shown in Figure 2, the differential amplifying circuit 12 includes An amplifier circuit 12〇 in which two operational amplifiers 121 and 122 are connected in parallel, a subtractor 123 connected in series after the amplifier circuit 120, and a DC blocking capacitor 124. m Please refer to FIG. 1 and FIG. The input end of 122 is connected to the microphone 1 for receiving the call voice signal, and the voltage of the output terminal is negatively fed back to its own inverting input terminal. Similarly, the input terminal of the operational amplifier 121 is connected to the receiving ring i brother. In the microphone Η, the voltage at the output terminal is negatively fed back to its own inverting input terminal. The amplifier circuit 12 〇 has high input resistance and low output impedance, and the input signal and the output signal have the same phase. In this embodiment, the subtractor 123 It is also an integrated operational amplifier having an input terminal connected to the output terminals of the operational amplifiers 121 and 122 for receiving an ambient noise signal and a call sound signal containing an ambient noise signal, and outputting a difference signal subtracted by the two signals. The output of the subtractor 123 is connected to the DC blocking capacitor 124, and the DC blocking capacitor 124 is used to filter out the difference nickname The signal is sent to the audio processing chip. 9 200822673 ia^uou 1 ^7.TW 21718twf.doc/n The signal received by the microphone ίο is a superposition of the ambient noise signal and the pure call voice signal, and the microphone 11 receives The signal is only the ambient noise signal. Therefore, after the two signals are subtracted by the subtractor circuit, a pure call voice signal can be obtained, thereby achieving the purpose of filtering the noise.
值得注意的是，上述圖2的電路結構僅係做為本發明 之一較佳實施例，但非用以限定本發明，熟知本領域技術 者當可視實際需要，在不脫離本發明的精神下，採用其他 種類的電路將此噪音訊號濾除。 〃 圖3是依照本發明較佳實施例所繪示的環境噪音過濾 方法抓私圖。睛參見圖3，本實施例適用於一手持通訊^ 置，而能夠避免環境噪音影響到手持通訊裝置之通話= 質。其中，手持通訊裝置例如是一個手機、智慧型手機g 個人數位助理手機，而不限定其範圍。此噪音過濾 ; 括下列步驟： 〜/匕 首先，在步驟S310中，分別使用第一收音設備及 收音設備採集-環境料訊敍包含該環縣音訊: =音訊號。其中，此第一收音設備係配置在距離U音源 二收音設備則配置在距離音源較遠的位 置’或疋面對與音源(通話者)方向相反的方向， 圍環境的噪音訊號。舉例來說，第-收音設備例如是一: ，置在手機正面的·，用以接收使用者發出的聲立 弟-收音設·㈣如是-個配置在手齡㈣♦八: 接收手機周圍的環境噪音。 用以 200822673 iauuoui47.TW 21718twf.doc/n 其次，在步驟S320中，則可使用例如差分放大電路等 設備將步驟S310中所採集到的環境噪音訊號及包含環境 噪音訊號的通話聲音訊號相減，而得到一個差值訊號，此 差值訊號即為純淨的通話聲音訊號。接著，在步驟S33〇 中，則是將此差值訊號再作放大處理後輸出。其中，在上 述步驟S320及S330中，相減及放大的步驟例:可利用一 個減法的運算放大器實現，本實施例不限制其範圍。 然後，在步驟S340中，則進一步從此放大後的差值 訊號中篩選出一交流訊號，而最後在步驟S35〇中，此交 流訊號則可透過音頻處理轉換成為一數位通話聲音訊號， 而能夠支援後續的傳輸或其他處理。 綜上所述，本發明的噪音過濾方法和裝置採用在同一 時間點同日梅製發話方的聲音以及周圍噪音，並適時抹除 通話聲音中的噪音，而能夠有效提升通話品質。此外，在 經過篩選域轉換後，更能夠提供作為後續傳輸及處理 之用，相當便利。 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 和範圍内，當可作些許之更動與潤飾，因此本發明之 範圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 圖1是依照 系統方塊圖。 本發明較佳實施例所繪示的環境噪音過濾 11 200822673 i e.TW 21718twf.doc/n 圖2是依照本發明較佳實施例所繪示的差分放大電路 的具體電路圖。 圖3是依照本發明較佳實施例所繪示的環境噪音過濾 方法流程圖。 【主要元件符號說明】 1 :噪音過濾裝置 10、11 :麥克風 12 :差分放大電路 2·音頻處理晶片 3:聲音播放設備 121、122 :運算放大器 123 :減法器 124 :隔直電容 S300〜S350 :本發明較佳實施例之噪音過濾方法的各 步驟。 12It should be noted that the above-mentioned circuit structure of FIG. 2 is only a preferred embodiment of the present invention, but is not intended to limit the present invention, and those skilled in the art can understand the actual needs without departing from the spirit of the present invention. This type of circuit is used to filter out the noise signal. 3 is a diagram showing an environmental noise filtering method according to a preferred embodiment of the present invention. Referring to FIG. 3, the embodiment is applicable to a handheld communication device, and can avoid the environmental noise affecting the call quality of the handheld communication device. Among them, the handheld communication device is, for example, a mobile phone, a smart phone, a personal digital assistant mobile phone, and does not limit its scope. The noise filtering includes the following steps: ~/匕 First, in step S310, the first sound collecting device and the sound collecting device are respectively used to collect the environmental information: the audio signal is included: = audio signal. The first sound collecting device is disposed at a distance from the U sound source and the second sound collecting device is disposed at a position farther from the sound source or 疋 facing a direction opposite to the sound source (talker) to surround the ambient noise signal. For example, the first-speaking device is, for example, a: placed on the front of the mobile phone, for receiving the voice issued by the user, the radio set-up (four), if yes - a configuration at the age of the hand (four) ♦ eight: receiving the mobile phone around Environmental noise. For use in 200822673 iauuoui47.TW 21718twf.doc/n, in step S320, the ambient noise signal collected in step S310 and the call sound signal including the ambient noise signal can be subtracted by using a device such as a differential amplifier circuit. And get a difference signal, the difference signal is a pure call voice signal. Next, in step S33, the difference signal is further amplified and output. In the above steps S320 and S330, the steps of subtracting and amplifying are performed by an operational amplifier of a subtraction, and the scope of the embodiment is not limited. Then, in step S340, an alternating signal is further filtered from the amplified difference signal, and finally, in step S35, the alternating signal can be converted into a digital voice signal through audio processing, and can be supported. Subsequent transfers or other processing. In summary, the noise filtering method and apparatus of the present invention employs the sound of the vocal vocal party and the surrounding noise at the same time point, and timely erases the noise in the call voice, thereby effectively improving the call quality. In addition, after the conversion of the screening domain, it is more convenient to provide for subsequent transmission and processing. Although the present invention has been described above in terms of the preferred embodiments thereof, it is not intended to limit the scope of the present invention, and the scope of the present invention can be modified and modified without departing from the scope of the invention. This is subject to the definition of the scope of the patent application. [Simple description of the drawing] Fig. 1 is a block diagram according to the system. Environmental noise filtering according to a preferred embodiment of the present invention 11 200822673 i e.TW 21718twf.doc/n FIG. 2 is a specific circuit diagram of a differential amplifying circuit according to a preferred embodiment of the present invention. 3 is a flow chart of an environmental noise filtering method according to a preferred embodiment of the present invention. [Description of main component symbols] 1 : Noise filtering device 10, 11 : Microphone 12 : Differential amplifying circuit 2 - Audio processing chip 3: Sound playback device 121, 122: Operational amplifier 123: Subtractor 124: DC blocking capacitor S300 to S350: Each step of the noise filtering method of the preferred embodiment of the present invention. 12