201023467 九、發明說明： 【發明所屬之技術領域】 本發明係有關於多媒體手機，尤其是有關於一種可保護 耳朵的音量控制方法。201023467 IX. Description of the Invention: [Technical Field] The present invention relates to a multimedia mobile phone, and more particularly to a volume control method for protecting an ear.
【先前技術J 第1圖係為一習知的多媒體手機100，包含一受話器 102用以播放音源訊號#A。在該受話器102與機殼之間連 ❹ 接著一個出音孔108，用以供音源訊號#A的傳導通過。藉 此，使用者將出音孔108貼近耳朵即可聽取該音源訊號 。另一方面，多媒體手機100中尚包含一喇叭112，以 擴音的方式播放音源訊號。該音源訊號#A'可以是來電 龄聲，而π刺η八112為了擴大音源訊號# A '，所產生的音量通 常相當大。如果使用者正好將耳朵貼近出音孔108，可能會 受到聲音衝擊的傷害。 • 為了解決這個問題，傳統的多媒體手機100可能會額 外設置一感應器106,用以偵測人的頭部與多媒體手機100 的距離。該感應器106通常是紅外線感應器。當耳朵貼近 出音孔108時，該感應器106發出一控制訊號#S通知處理 器104，使處理器104抑制音源訊號#A'的增益值。 然而，額外增設一個感應器106，是一種增加成本與系 統複雜度的做法。 HTC097170-0-TW/:0746-A41849TWf/Final 201023467 【發明内容] 本發賴出-種多顧H在其中，—增益放大器根 據一控_號控制-音源訊號的增益…第_揚聲器與—第 共用—背氣腔，在第—揚聲器播放該音源訊號時， 揚聲器產生一感應電動勢。-偵測器咖第二揚聲 "，用以_該感應電動勢，並根據該感應電動勢產生該控 制訊號。當該感應電動勢大於—臨界值時，該制_ 控制訊齡令朗減大__音祕 一揚聲器播放音量。 降低第 忒偵測器係為一比較器，具有一 ^ 第一輸入端接收該感應 電動勢，一第二輸入端接收該臨 為該控制訊號。 1值讀出之比較結果即 料Γ步地，該多媒财置切1_可域式地選擇 =该曰源訊號輸出至該第—揚聲器或該第二一、 體耦接該第二揚聲器和該選擇器 Β 一極 動勢從該第二揚聲器回饋至該選擇：。可用以防止該感應電 當該選擇器選擇將該音源訊 時，該偵測器_。當該選擇器 ~聲盗 增益放大器時，該偵測器開啟。、音源訊號輸出至該 一第一出音孔連接該第一揚聲 器發出之聲音。-第二出音孔連接广傳導該第一揚聲 該第二揚聲器發出之聲音。#該第:揚声二揚聲器，用以傳導 HTC097170-0-TW/:0746-A41849TWf/Final 本器播放該音源訊號 201023467 時，透過該背氣腔使該第二揚聲器的音膜共鳴振動，藉此帶 動該第二揚聲器中的線圈而產生該感應電動勢。 該臨界值料定’係為第二出音孔被使用者耳朵或其他 物體遮蓋與未遮蓋時第：麟器音膜和音圈振動幅度不同， 依據經驗值所設定的感應電動勢。 本發明所提出的多媒體裝置尤其適用於—行動電話。其 中該第-揚聲器係、為八，該第二揚聲器係為—受話器， # 而該音源訊號係為一來電鈴聲或一校準測試音。 在另一實施例中，本發明揭露一種音量控制方法，應用 於上述多媒體裝置中。首先，使該第一揚聲器播放一音源訊 號。接著偵測該第二揚聲器產生的—感應電動勢。如果該感 應電動勢大於一臨界值，降低該音源訊號的增益。 【實施方式】 下列實施例具體的說明如何以較佳的方式實現本發 •明。實施例僅供說明-般應用的方式，而非用以限縮本發明 的把圍。貝際範圍以申睛專利範圍所列為準。 本發明所提出的架構不需要額外配置紅外喊測器，而 是直接利用伽\與受話器之間互域㈣原理，來判斷耳朵 的位置。在多媒體手機中"刺队與受話器之間共用同一個背 氣腔，因此㈣在發出聲音時，會㈣受話器的音膜及線圈 振動而產生微量的感應電動勢。受話器的出音孔，如果被外 HTC097170-0-TW/:0746-A41849TWi/Final 7 .201023467 物遮蓋’所產生的感應電動勢之量級也會有差異。所以測量 受話器的感應電動勢，可以有效的判斷耳朵是否貼近受話 器。 第2圖係為本發明實施例的多媒體裝置200。該多媒 體裝置200可以是一典型的手機或電話聽筒，具有一喇口八 202和一受話器212共用同一個背氣腔210。該喇叭202 之外連接一第一出音孔2 〇4，用以傳導該喇叭2〇2發出之 聲曰。同樣的，該受話器212之外連接一第二出音孔214， 用以傳導該受話器212發出之聲音。該喇叭2〇2提供免持 聽筒的功能，因此所播放的音源訊號#A，音量較大。該音源 訊號#A，的增益係由一增益放大器2〇6提供，而該增益放大 器206則是根據一控制訊號#ctrl決定增益的大小。 在多媒體裝置200巾，本發明提出一種谓測器22〇， 耦接該受話器212，用以偵測該受話器212產生的一感應 電動勢Sin ’並根據該感應電動勢sin產生該控制訊號 #ctrl。δ亥文话斋212可以是一傳統的受話器，其中包含 一些發聲必要的基本元件如線圈和音膜。而聲音是透過緊鄰 的第二出音孔2；U傳送出去。由於受㈣出並未提供很 高的增益值，所以使用者必須將耳朵貼近第二出音孔214 才能聽得到聲音。當該受話器⑴料騎聲音時，係從 多媒體裝置200中的端點p接收音源訊號。而當受話器212 HTC097170-0-TW/:0746-A41849TWi7Final 8 201023467 用來當感應器時，該偵測器22〇也是從該端點p來偵測該 受話器212中產生的感應電動勢Sin。 如果第二出音孔214沒有被異物遮蓋，受話器212中 的振膜與線圈可產生較大的感應電動勢。相對的，如果第二 出音孔214被耳朵或其他物品遮蓋了，形成密閉空間，受 話器212中的振膜就會受到氣壓的限制而產生較低的感應 電動勢。因此可根據實際經驗決定—臨界值恤，使债測器 220將該錢電動勢sin與該臨界細❽進行比較，以判 斷第二出音孔214的遮蓋情形。更確切的說，該臨界值_ 的選擇，必須低於該第二出音孔214未被遮蓋時所產生的 感應電動勢L該第二出音孔叫_蓋時所產生的 感應電動勢。在實際運作時，只要職應電動勢处大於 該臨界值㈣，該偵㈣22Q便可透過該㈣咖咖 命令該增益放大器施降低該音源訊號私的增益，產生調 整後的音源訊號#A'。 更具體地說，該偵測器22Q可以是―個比較器，且有 一第一輸人端接收該感應電動勢Sin，—第二輸人端接收臨 界⑽th，而輸出之比較結果即為該控制訊號#c⑴。 該受話器212的運作情形可能有很多種。舉例來說， 使用者正在透過受話器212收聽第—音源訊號，例如音樂， 而糾2G2突然收到來電或被其他事件觸發而播放—第、二 HTC097170-0-TW/:0746-A41849TWf/Final 9 .201023467 曰源訊號’例如來電铃聲。此時受話器212原本播放狀離 會先暫停，同時偵測器22Q啟動則貞測受話器212的感應 電動勢Sin值，以決定來電鈐聲的播放音量。 另一方面來說，使用者可能正在透過伽V 202以廣播 的方式收聽音樂’卻㈣需要使用受話器212來接聽私人 電話。此時侧器220可即時判斷耳朵是否靠近，而將剩 °八202關閉，受話器212開啟。 在偵測第二出音孔214的遮蓋狀態時，該多媒體裝置 2〇〇可先透過喇队2〇2播放一預設的校準測試音，讓偵測 器22〇接收感應電動勢sin。然而該多媒體裝置2〇〇也可 以直接輸出來電龄聲，讓偵測器22〇即時判斷是否需要抑 制的增益。多媒體裝置200的實際操作與應用可以有很多 種變化，本發明不限制喇叭202與受話器212的切換流程。 通常喇队2〇2或受話器2：L2並不會同時開啟，只會擇 一開啟。例如在免持聽筒模式，只有喇„八2〇2需要開啟， 受話器212並不需要開啟。相對的，在聽筒模式，只有受 話器212開啟’而喇叭2〇2是關閉的。因此，該多媒體裝 置2 00可進一步包含一選擇器23〇，用以決定將音源訊號 切換給剩p八202或受話器212。 在本實施例中，由於偵測器220是連接受話器212的 輸入端點P，當受話器212產生感應電動勢Sin時，需要 HTC097170-0-TW/:0746-A41849TWf/Final 201023467 一個二極體218以防止感應電動勢Sin倒灌回選擇器23 0 或前一級電路。當該選擇器230選擇將該音源訊號#A輸出 至該受話器212時，並沒有抑制喇叭202的必要，因此該 偵測器220是處於關閉狀態。相對的，當該選擇器23 0選 擇將該音源訊號輸出至該喇叭202時，才有必要將該偵測 器220開啟。當該喇叭202播放該音源訊號#丸'時，透過 該背氣腔210使該受話器212的音膜共鳴，藉此帶動該受 ❹ 話器212中的線圈而產生感應電動勢Sin。 實作偵測器220的電路只需要一個簡單的比較器，所 需耗費的成本比傳統的紅外線感測器還低。本發明並不限定 偵測器22◦的實際電路設計。 本發明的多媒體裝置200尤其適合應用在行動電話 中。而用來判斷第二出音孔214的遮蓋狀態的音源訊號可 以直接採用來電鈴聲或是另外提供一校準測試音。 # 更進一步地說，該偵測器220也可以利用同樣的原理 來判斷第一出音孔204的遮蓋狀態。如果該多媒體裝置200 是放置於口袋中，第一出音孔2 04和第二出音孔214會同 時被遮蓋。此時並沒有保護耳朵的必要，相對的，反而是需 要增大音量才能讓使用者聽到來電鈴聲。因此只有單一出音 孔被遮蓋，或是兩個出音孔皆被遮蓋，是有不同的處理方式 的0 HTC097170-0-TW/:0746-A41849TWf/Final 11 201023467 第3圖係為本發明音量控 中，啟動^ 置控制方法的流程圖。在步驟301 τ啟動如第2圖所示 心媒體裝置2⑽。在步驟303中， 田來電或者特別事件觸發時 ^#A, 々A 啊％利°八202開啟並播放音源訊 lC#A 在步驟3 05中，缽佶巾,松 Μ 21Ρ h 以貞測器220透過端點P偵測受 活益212產生的感應電 考220化“ 勢ln。在步驟3〇7中，該镇測 益22Q比較感應電動勢sin歲 〜4界值㈣，而比較結果即 虽成控制訊號#ctrl輪出給增兴 • 動熱9皿放大為2〇6。如果感應電 動勢η小於臨界值#比，表示耳朵未 因此進行步驟3Q9。>謹& t W要保沒， h二 果感應電動勢如大於臨 界值批，則如步驟311所示抑制增益 309中，；ΗέΜ姑士毋。 叉卞木在步驟 爸S 2〇6不抑制音源訊號#义的增益，使立 =岐直接透過·如播放出去。在步驟3ΐι中^ =放=咖根據控制_咖抑制音源訊號#a _ * 個音讀低或者靜音的音源訊號…。 雖然本發明以較佳實施例說明如上，但可以理解 ，範圍未必如此限定。相對的，任何基於相同精神或： 白知技術者為顯而易見的改良皆在本發明涵蓋範圍内。因 專利要求範圍必須以最廣義的方式解讀。 匕 【圖式簡單說明】 第1圖係為一習知的多媒體手機100; 第2圖係為本發明實施例的多媒體mu及 HTC097170-0-TW/:0746-A41849TWf/Final 201023467 第3圖係為本發明音量控制方法的流程圖。 【主要元件符號說明】 100多媒體手機 102受話器 104處理器 .10 6感應器 108出音孔 200多媒體裝置 2 0 2咮丨J攻\ 204第一出音孔 206增益放大器 210背氣腔 212受話器 214第二出音孔 218二極體 230選擇器 220偵測器 HTC097170-0-TW/:0746-A41849TWf/Final[Previous Art J FIG. 1 is a conventional multimedia mobile phone 100, and includes a receiver 102 for playing the sound source signal #A. A sound hole 108 is connected between the receiver 102 and the casing for conducting the sound source signal #A. Therefore, the user can listen to the sound source signal by placing the sound hole 108 close to the ear. On the other hand, the multimedia mobile phone 100 further includes a speaker 112 for playing the sound source signal in a sound amplification manner. The sound source signal #A' can be an incoming call age sound, and the π ηη八112 is usually quite large in order to enlarge the sound source signal # A '. If the user just puts his or her ear close to the sound hole 108, it may be damaged by the sound. In order to solve this problem, the conventional multimedia mobile phone 100 may additionally provide a sensor 106 for detecting the distance between the person's head and the multimedia mobile phone 100. The sensor 106 is typically an infrared sensor. When the ear is close to the sound hole 108, the sensor 106 sends a control signal #S to notify the processor 104 to cause the processor 104 to suppress the gain value of the sound source signal #A'. However, the addition of an additional sensor 106 is an increase in cost and system complexity. HTC097170-0-TW/:0746-A41849TWf/Final 201023467 [Summary of the Invention] The present invention relies on a variety of H in it, the gain amplifier is controlled according to a control number - the gain of the sound source signal... _theater and - The shared-back air chamber generates an induced electromotive force when the first speaker plays the sound source signal. - the second speaker of the detector coffee ", for the induced electromotive force, and generating the control signal according to the induced electromotive force. When the induced electromotive force is greater than the -threshold value, the system_control age is reduced by a large amount of __sounds. The lower detector is a comparator having a first input receiving the induced electromotive force and a second input receiving the control signal. The comparison result of the 1-value readout is expected to be step-by-step, and the multi-media cut 1_ can be field-selected = the source signal is output to the first speaker or the second body is coupled to the second speaker And the selector Β a momentum is fed back from the second speaker to the selection: Can be used to prevent the inductive power when the selector selects the source, the detector _. When the selector ~ sound thief gain amplifier, the detector is turned on. The sound source signal is output to the first sound hole to connect the sound of the first speaker. - The second sound hole is connected to widely transmit the first speaker. The sound emitted by the second speaker. #第第:Speaking two speakers for conducting HTC097170-0-TW/:0746-A41849TWf/Final When playing the sound source signal 201023467, the sound film of the second speaker vibrates and vibrates through the back air cavity. This drives the coil in the second speaker to generate the induced electromotive force. The critical value is determined as the induced electromotive force set by the empirical value when the second sound hole is covered by the user's ear or other object and is uncovered. The multimedia device proposed by the present invention is particularly suitable for use in a mobile phone. The first speaker system is eight, and the second speaker is a receiver, and the source signal is an incoming ringtone or a calibration test tone. In another embodiment, the present invention discloses a volume control method for use in the above multimedia device. First, the first speaker is caused to play an audio source signal. Then, the induced electromotive force generated by the second speaker is detected. If the induced electromotive force is greater than a threshold, the gain of the source signal is reduced. [Embodiment] The following examples specifically illustrate how the present invention can be implemented in a preferred manner. The examples are for illustrative purposes only and are not intended to limit the scope of the invention. The Beige range is subject to the scope of the patent application. The architecture proposed by the present invention does not require an additional configuration of the infrared sniffer, but directly utilizes the inter-domain (four) principle between the gamma and the receiver to determine the position of the ear. In the multimedia mobile phone, the same air cavity is shared between the stab team and the receiver, so (4) when the sound is emitted, the sound film and coil of the receiver (4) vibrate to generate a small amount of induced electromotive force. The sound hole of the receiver, if it is covered by the external HTC097170-0-TW/:0746-A41849TWi/Final 7 .201023467, the magnitude of the induced electromotive force will also vary. Therefore, measuring the induced electromotive force of the receiver can effectively judge whether the ear is close to the receiver. 2 is a multimedia device 200 according to an embodiment of the present invention. The multimedia device 200 can be a typical mobile phone or telephone handset having a bayonet 202 and a receiver 212 sharing the same back air cavity 210. The horn 202 is connected to a first sound hole 2 〇4 for transmitting the vocal chord emitted by the horn 2 〇 2 . Similarly, the second speaker hole 214 is connected to the receiver 212 for transmitting the sound emitted by the receiver 212. The speaker 2〇2 provides the function of the speakerphone, so the sound source signal #A played is louder. The gain of the source signal #A is provided by a gain amplifier 2〇6, and the gain amplifier 206 determines the magnitude of the gain based on a control signal #ctrl. In the multimedia device 200, the present invention provides a pre-detector 22A coupled to the receiver 212 for detecting an induced electromotive force Sin' generated by the receiver 212 and generating the control signal #ctrl according to the induced electromotive force sin. δ海文话斋212 can be a conventional receiver, which contains some basic components such as coils and sound films necessary for sounding. The sound is transmitted through the second sound hole 2; Since the (4) output does not provide a very high gain value, the user must hold the ear close to the second sound hole 214 to hear the sound. When the receiver (1) is riding a sound, the sound source signal is received from the end point p in the multimedia device 200. When the receiver 212 HTC097170-0-TW/:0746-A41849TWi7Final 8 201023467 is used as a sensor, the detector 22 detects the induced electromotive force Sin generated in the receiver 212 from the end point p. If the second sound hole 214 is not covered by foreign matter, the diaphragm and the coil in the receiver 212 can generate a large induced electromotive force. In contrast, if the second sound hole 214 is covered by the ear or other objects to form a confined space, the diaphragm in the receiver 212 is restricted by the air pressure to generate a lower induced electromotive force. Therefore, the critical value shirt can be determined based on actual experience, and the debt detector 220 compares the money electromotive force sin with the critical fineness to determine the covering condition of the second sound hole 214. More specifically, the selection of the threshold _ must be lower than the induced electromotive force generated when the second sound hole 214 is not covered, and the induced electromotive force generated when the second sound hole is called the cover. In actual operation, as long as the duty factor is greater than the threshold (4), the detector (4) 22Q can use the gainer to command the gain amplifier to reduce the gain of the source signal, and generate the adjusted source signal #A'. More specifically, the detector 22Q can be a comparator, and a first input terminal receives the induced electromotive force Sin, and the second input terminal receives a critical (10)th, and the output comparison result is the control signal. #c(1). The receiver 212 may operate in a variety of situations. For example, the user is listening to the first source signal, such as music, through the receiver 212, and the 2G2 suddenly receives the incoming call or is triggered by other events to play - the second and second HTC097170-0-TW/:0746-A41849TWf/Final 9 .201023467 曰源信号', such as ringtones. At this time, the original playback state of the receiver 212 is suspended first, and the detector 22Q is activated to measure the induced electromotive force Sin value of the receiver 212 to determine the playback volume of the incoming call beep. On the other hand, the user may be listening to music via the gamma V 202 in a broadcast mode. However, the receiver 212 is required to answer the private call. At this time, the side device 220 can immediately judge whether the ear is close, and the remaining ° 202 is closed, and the receiver 212 is turned on. When detecting the occlusion state of the second sound hole 214, the multimedia device 2 can first play a preset calibration test tone through the racquet 2 〇 2, and the detector 22 〇 receives the induced electromotive force sin. However, the multimedia device 2 can also directly output the incoming call age, and the detector 22 can immediately determine whether the suppressed gain is required. There are many variations in the actual operation and application of the multimedia device 200. The present invention does not limit the switching process between the speaker 202 and the receiver 212. Usually the team 2〇2 or the receiver 2: L2 will not be turned on at the same time, only one will be turned on. For example, in the hands-free mode, only the PDA 8 needs to be turned on, and the receiver 212 does not need to be turned on. In contrast, in the handset mode, only the receiver 212 is turned on and the speaker 2 〇 2 is turned off. Therefore, the multimedia device The 00 may further include a selector 23 决定 for determining to switch the sound source signal to the remaining p eight 202 or the receiver 212. In the embodiment, since the detector 220 is connected to the input terminal P of the receiver 212, the receiver is used. 212 generates an induced electromotive force Sin, which requires HTC097170-0-TW/:0746-A41849TWf/Final 201023467 a diode 218 to prevent the induced electromotive force Sin from being poured back to the selector 23 0 or the previous stage circuit. When the selector 230 chooses to When the sound source signal #A is output to the receiver 212, it does not suppress the necessity of the speaker 202, so the detector 220 is in the off state. In contrast, when the selector 230 selects to output the sound source signal to the speaker 202, It is necessary to turn on the detector 220. When the speaker 202 plays the sound source signal #丸', the sound film of the receiver 212 is resonated through the back air chamber 210, thereby driving the receiver. The coil in the device 212 generates an induced electromotive force Sin. The circuit for implementing the detector 220 requires only a simple comparator, and the cost is lower than that of the conventional infrared sensor. The present invention does not limit the detector. 22 ◦ actual circuit design. The multimedia device 200 of the present invention is particularly suitable for use in a mobile phone. The sound source signal used to determine the occlusion state of the second sound hole 214 can be directly used to ring the ringtone or provide a calibration test tone. Further, the detector 220 can also use the same principle to determine the state of the cover of the first sound hole 204. If the multimedia device 200 is placed in a pocket, the first sound hole 2 04 and the first The second sound hole 214 will be covered at the same time. There is no need to protect the ear at this time. Instead, the volume needs to be increased to allow the user to hear the ringing tone of the call. Therefore, only a single sound hole is covered, or two out. The sound holes are covered, and there are different ways of processing. HTC097170-0-TW/:0746-A41849TWf/Final 11 201023467 The third picture is the volume control of the present invention, and the control is set. Flowchart of the method. In step 301, τ activates the heart media device 2 (10) as shown in Fig. 2. In step 303, when the field call or special event is triggered ^#A, 々A 啊%利°八202 is turned on and the audio source is played. lC#A In step 3 05, the towel, the pine cone 21Ρ h, is detected by the detector 220 through the endpoint P to detect the induced electropath 220 generated by the benefit 212. In step 3〇7, the town's measurement 22Q compares the induced electromotive force sin to the 4th limit value (4), and the comparison result is that the control signal #ctrl turns out to give rise to the booster. If the induced electromotive force η is smaller than the critical value # ratio, it means that the ear is not subjected to step 3Q9. >Just & t W to be protected, h 2 If the induced electromotive force is greater than the critical value batch, then as shown in step 311, the gain is suppressed in 309; Fork in the step Dad S 2〇6 does not suppress the gain of the source signal #义, make the vertical = 岐 directly through · such as play out. In step 3 ΐι ^ ^ = put = coffee according to the control _ coffee suppression source signal #a _ * sound to read low or mute source signal .... Although the invention has been described above by way of preferred embodiments, it is understood that the scope is not necessarily limited. In contrast, any improvement based on the same spirit or: the white technology is obvious within the scope of the present invention. Because the scope of patent claims must be interpreted in the broadest sense. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conventional multimedia mobile phone 100; FIG. 2 is a multimedia mu and HTC097170-0-TW/: 0746-A41849TWf/Final 201023467 3rd embodiment of the present invention It is a flowchart of the volume control method of the present invention. [Main component symbol description] 100 multimedia mobile phone 102 receiver 104 processor. 10 6 sensor 108 sound hole 200 multimedia device 2 0 2咮丨J attack \ 204 first sound hole 206 gain amplifier 210 back air cavity 212 receiver 214 Second sound hole 218 diode 230 selector 220 detector HTC097170-0-TW/: 0746-A41849TWf/Final