經濟邹中央標準局員工消费合作社印背 3 90 2 7 • Λ 7 _______Η7 五、發明説明（ι ) 一 本發明係有關於-種音頻處理電路省電装£和其控制方 法’特別是提供-種能夠根據聲音訊息的狀態來控制音頻處 理電路的·^電裝置以及其控制方法。 .對於一般筆記型電腦或是其他可攜式電子產品而言，電 源管理是栢當重要的課題。這是因為大部分的操作情況下， 筆記型電腦或其他可攜式電子產品是以電池（或是可充電電 池）來提供所需要的電力。因此，電力消耗的有效控制是設 計者必要面對的問題。 在筆記型電腦系、统中’ {專統的音頻處理電路在系統開機 後，一般是一直處在啟動的狀態。換言之，無論系統目前確 實在進行聲音的撥放，或是沒有進行聲音的撥放，音頻處理 電路都是一直維持著啟動的狀態，自然也會持續地消耗著電 力。這種情況對於電源管理而言，是相當不利並且也需要解 決的問題。 有鑑於此，本發明的主要目的，在於提供一種音頻處理 電路省電裝置和其控制方法，能夠在需要提供聲音撥放時， 維持音頻處理電路的啟動狀態，同時也能夠在不需要提供聲 音撥放時，暫停音頻處理電路的動作，藉此節省不需要浪費 的電力。 根據上述之目的，本發明所提出之第—種音頻處理電路 省電裝置’是適用在音頻處理電路中具有一音頻考，大電路， 其由一電壓源提供電力之情況。此省電装置包括一音頻感測 電路’其接收一音頻輸入信號，並且根據此音頻輸入信號產 生一指示信號，用以表示此音頻輸人信號是否存在音頻訊 息；以及一電源控制電路-，耦接於音頻感測電路以及提供音 -3 - (¾先閱讀背而之注意事項再填荇本頁) .丨装. 訂 本紙浪尺度適用中國國家標隼（〇犯）/\4現格（2]0乂 297公处） -滴部中央榡率局貝工.消#'合作"印繁Economic Zou Central Standard Bureau Staff Consumer Cooperatives Copied 3 90 2 7 • Λ 7 _______ Η7 V. Description of the Invention (ι)-The present invention relates to-a kind of audio processing circuit power-saving equipment and its control method 'especially provided-a kind of An electric device for controlling an audio processing circuit and a control method thereof according to a state of a voice message. For general laptops or other portable electronic products, power management is an important issue for Pandang. This is because in most operating situations, laptops or other portable electronic products use batteries (or rechargeable batteries) to provide the required power. Therefore, effective control of power consumption is a problem that designers must face. In the notebook computer system, the “{specialized audio processing circuit” is generally always started after the system is turned on. In other words, no matter the system is actually playing sound or not playing sound, the audio processing circuit is always kept activated and naturally consumes power. This situation is quite detrimental to power management and also needs to be addressed. In view of this, the main object of the present invention is to provide a power-saving device for an audio processing circuit and a control method thereof, which can maintain the startup state of the audio processing circuit when it is required to provide sound playback, and can also During playback, the operation of the audio processing circuit is suspended, thereby saving unnecessary power. According to the above object, the first type of audio processing circuit power-saving device proposed by the present invention is applicable to the case where the audio processing circuit has an audio test and a large circuit, which is provided with power by a voltage source. The power saving device includes an audio sensing circuit that receives an audio input signal and generates an indication signal based on the audio input signal to indicate whether an audio message exists in the audio input signal; and a power control circuit-coupler Connected to the audio sensing circuit and provide the tone -3-(¾Read the precautions before filling this page). 丨 Installed. The scale of the paper is applicable to the national standard of China (0 criminal) / 4 current grid ( 2] 0 乂 297 public office)-Central Department of Dibu Central Committee led shellfisher. Elimination of 'cooperation' " Infantry
AT ____B7 五、發明説明（2 ) 琴放大電路電力之電壓源，其根據指示信號，控制電壓源是 否提供電力至音頻放大電路。當指示信號表示音頻輸入信號 不存在音頻訊息時’則電源控制電路控制電壓源，使其不提 供電力至音頻放大電路。當指示信號表示音頻輸入信號存在 音頻訊息時，電源控制電路則控制電壓源，使其提供電力至 音頻放大電路。藉此，音頻放大電路是否維持動作，需視目 前的音頻輸入信號是变存在有效的音頻訊息而定。 本發明所提供之<二種音頻處理電路省電裝置，是適用 在音頻處理電路中具有一音頻放大積體電路，其具有一關閉 控制端，可以用來控制此音頻放大積體電路的動作狀態和暫 停狀態。此省電裝置包括一音頻感測電路，其耦接於音頻輸 入信號和音頻放大積體電路之間，用來根據此音頻輸入信號 產生一指示信號’以表示音頻輸入信號是否存在音頻訊息， 而此指示信號則輸出到音頻放大積體電路的關閉控制端。當 音頻輸入信號不存在音頻訊息時，則指示信號可以控制此音 頻放大積體電路，使其為暫停狀態。當音頻輸入信號存在音 頻訊息時，則指示信號可以控制此音頻放大積體電路，使其 爲動作狀態。藉此，音頻放大積體電路是否維持動作，需視 目前的音頻輸入信號是否存在有效的音頻訊息而定。 本發明所提供之一種音頻處理電路之省電控制方法，其 包括下列步驟。首先，判斷此音頻輸入信號是否存在音頻訊 息’接著根據此判斷結果’產生一指示信號，用以表示此音 頻輸人信號是否存在任何音頻訊息。最後，根據此指示信號’ 控制音頻處理電路中的音頻放大電路爲動作狀態或是暫侉狀 態。當指示信號表示不存在音頻訊息時，則控制為暫停狀態； 氏狀度_悄則:料（CN$…顺（21Gx 297“- -ίι n fj - —I - ---1 I . n _ (^先閱請背而之注意事項再填轉本页) 訂 經濟部中央標隼局負工消费合作社印緊 丨 S02 7' A 7 I-—___H7 一一 五、發明説明（3 ) ^ — ~~ 當指示信號表示存在音頻訊息時，則控制為勤作狀態。要控 制晋頻放大電路爲動作狀態或暫停狀態，則可以利用控制提 供電力至該音頻放大電路之電壓源，或是控制此音頻放大電 路t的關閉控制端，藉此達到狀態控制的目的。 圖式之簡單說明： 為使本發明之上述目的、特徵和優點能更明顯易僅，下 文特舉—較佳實施例，並配合所附圖式，作詳細說明如下： 第1圖表示本發明第一實施例中音頻處理電路和省電装 置的詳細電路圖。 第2圖表示本發明第二實施中音頻處理電路和省電装置 的詳細電路圖。 第3圖表示本發明之音頻處理電路省電控制方法的流程 圖。 符號說明： 1〜揚聲器；2〜音頻放大電路；3〜緩衝電路；5〜前置放大 電路；7〜音頻感測電路；9〜延遲電路；10~電源控制電路； la〜右聲道揚聲器；lb〜左聲道揚聲器；3a、3b〜緩衝電路； 5a、5b〜前置放大電路；7a、7b〜音頻感測電路；20〜音頻放 大積體電路。 實施例： 本發明之音頻處理電路省電裝置，主要是遠過對目前音 頻輸入信號的監視，來判斷出目前音頻輸入信號中是否包含 -5 - 本紙張尺度適用中國國家樣隼i CNS ) 規祜（210X297公]ΐΓΓ~~ ^~" I I--1 -- -- 1 II ·4^-- Τ ("先閱讀背而之注意事項再填寫本頁) *1Τ 43 B027 - A"AT ____B7 V. Description of the invention (2) The voltage source of the electric power of the piano amplifier circuit, according to the instruction signal, controls whether the voltage source provides power to the audio amplifier circuit. When the indication signal indicates that there is no audio signal from the audio input signal, the power control circuit controls the voltage source so that it does not provide power to the audio amplifier circuit. When the indication signal indicates that there is an audio message in the audio input signal, the power control circuit controls the voltage source to provide power to the audio amplifier circuit. Therefore, whether the audio amplifying circuit maintains operation depends on whether the current audio input signal becomes a valid audio message. The <two audio processing circuit power saving devices provided by the present invention are applicable to an audio amplifier integrated circuit in the audio processing circuit, which has a shutdown control terminal and can be used to control the operation of the audio amplifier integrated circuit. Status and pause status. The power saving device includes an audio sensing circuit, which is coupled between the audio input signal and the audio amplification integrated circuit, and is used for generating an indication signal according to the audio input signal to indicate whether an audio signal exists in the audio input signal, and This indication signal is output to the shutdown control terminal of the audio amplifier integrated circuit. When there is no audio message in the audio input signal, the indication signal can control the audio amplification integrated circuit to make it pause. When there is an audio signal in the audio input signal, the indication signal can control the audio amplifier integrated circuit to make it into an operating state. Therefore, whether the audio amplification integrated circuit maintains operation depends on whether a valid audio message exists in the current audio input signal. A power-saving control method for an audio processing circuit provided by the present invention includes the following steps. First, determine whether there is audio information in the audio input signal ', and then generate an indication signal according to the determination result' to indicate whether there is any audio information in the audio input signal. Finally, according to the instruction signal, the audio amplifier circuit in the audio processing circuit is controlled to be in an operating state or a temporary state. When the indication signal indicates that there is no audio message, the control is in the paused state; (^ Please read the precautions on the back first, then fill in this page) Order the Central Labor Bureau of the Ministry of Economic Affairs and the Consumer Cooperatives for Printing 丨 S02 7 'A 7 I -—___ H7 One-Fifth, Description of Invention (3) ^ — ~~ When the indication signal indicates that there is an audio message, the control is in a state of hard work. To control the frequency amplification circuit to be in an operating state or a pause state, you can use the control to provide power to the voltage source of the audio amplification circuit, or control this The control terminal of the audio amplifier circuit t is closed, thereby achieving the purpose of state control. Brief description of the drawing: In order to make the above-mentioned objects, features, and advantages of the present invention more obvious and easy, only the following is given-the preferred embodiment, and With reference to the drawings, the detailed description is as follows: Fig. 1 shows a detailed circuit diagram of an audio processing circuit and a power saving device in a first embodiment of the present invention. Fig. 2 shows an audio processing circuit and a power saving device in a second embodiment of the present invention. Detailed circuit diagram. A flowchart showing a power-saving control method of the audio processing circuit of the present invention. Symbol description: 1 ~ speaker; 2 ~ audio amplifier circuit; 3 ~ buffer circuit; 5 ~ preamp circuit; 7 ~ audio sensing circuit; 9 ~ delay Circuit; 10 ~ power control circuit; la ~ right channel speaker; lb ~ left channel speaker; 3a, 3b ~ buffer circuit; 5a, 5b ~ preamp circuit; 7a, 7b ~ audio sensing circuit; 20 ~ audio Amplify the integrated circuit. Example: The power saving device of the audio processing circuit of the present invention is mainly to monitor the current audio input signal to determine whether the current audio input signal contains -5.隼 i CNS) Regulations (210X297) ΐΓΓ ~~ ^ ~ " I I--1--1 II · 4 ^-Τ (" Read the precautions before filling in this page) * 1Τ 43 B027-A "
------— _____ IP 五 '發明説明（4 ) i.i衣. 有需要進什聲音播放的音頻訊息，或是不包含任何音頻訊 息，也就是判斷目前系統是否要進行聲音的播放。當需要進 行聲音播放時，可以維持音頻處理電路的動作；當不需要遠 行聲音播放時，則可以暫停音頻處理電路的動作，以節省電 力的消耗。由於本發明中用來監視音頻輸入信號的相關感測 電路和控制電路是處於小訊號的處理’因此可以利用低電壓 源進行操作，而使得耗電量較少；相對地，可以節省音頻放 大電路對於電力消耗，所以整體而言，仍可以達到節省電力 的目的。以下配合圖式’對於本發明實施例迫行詳細的說明。 【第一實施例】 T- •^• 第1圖表示第一實施例中音頻處理電路和省電装置的詳 細電路圖。在第一實施例中所處理的情況中，主要特徵在於 單聲道(mono)的音頻輸入信號VI，以及音頻放大電路是以 個別（discrete)電子零件所構成。 經满邹中央標辛局KX.消#'合作.杜印昶 整個音頻處理電路是由揚聲器1、音頻放大電路2以及 缓衝電路3所構成。緩衝電路3爲一選擇性設置的電路，其 為運算放大器OP2所構成，主要用來緩衝音頻輸入信號vi 的輸入。音頻放大電路2則連接於緩衝電路3，用來接收處 理後的音頻輸入信號VI，在經過放大後，輸出到揚聲器1 進行聲音的播放。 如前所述，在本實施例中，音頻放大電路2是由個別電 子零件所構成，其中包括運算放大器OP1、電阻器IU〜R4 以及電容器C1〜C3。其中，電容器C1和電容器C2是做為 直流阻絕（DC-blocking)電容，而電容器C3則是做爲高頻耦 合電容。電阻器IU〜R4和運算放大器OP1則是構成主要的 本紙張尺度適用中家標準（CNS ) 怙（210x2<m,>^ ) ---1--- 經漓部中央標苹局員工消費合作社印敕 Α7 Β7 五、發明説明（5 ) 音頻放大部分’其中電阻器和電阻器R2以分壓方式， 提供一參考電壓至運算放大器〇P1的非反栢輸入端（noninverting terminal)。 因此 ，可以根據此參考電壓值， 以及耦 接在反相輸入魂（inverting terminal)和輸出端之電阻器R3和 電阻器R4間電阻值比例，決定出音頻放大電路2對於音頻 輸入信號VI的放大增益。在音頻放大電路2中另一重要參 數，是提供至運算放大器0P1的電壓源VA。電壓源VA較 一般電壓源VCC(例如對運算放大器〇P2提供電力的電源） 為高’而運算放大器0P2唯有在提供電壓源VA的情況下， 才可以進行放大的動作。在本實施例中’主要即透過電壓源 VA的控制，來達到啟動或是關閉音頻放大電路2的目的。 在第1圖中，整個省電裝置則包括前置放大電路5、音 頻感測電路7、延遲電路9以及電源控制電路10。以下依序 說明各電路之實際結構以及其對應的功能和動作。 前置放大電路5為一選擇性設置的電路，其主要是用來 將接出的音頻輸入信號VI進行初步的放大。前置放大電路 5包括運算放大器OP3、電阻器R5〜R8以及電容器C4、C5。 前置放大電路5中各電子零件的作用類似於音頻放大電路 2 ’故此處不再重複敘述。前置放大電路5與音頻放大電路 2的主要差別，在於使用的偏壓電壓源不同》前置放大電路 5主要是採用電壓值較低的電壓源VCC，這是因為其作用並 不是提供功率上的放大，所以其耗電量仍遠低於音頻放大電 路2。最後，前置放大電路5將放大後音頻輸入信號V2輸 出到下一級的音頻感測電路7。 晋頻感測電路7主要是用來檢測音頻輸入信號上是否有 本紙張尺度適用中國阄家標準（CNS )以現袼（2IOX2y\.>tt (#先間讀背而之注意事項再4¾本頁)------— _____ IP 5 'Explanation of the invention (4) i.i clothing. There are audio messages that need to be played or do not contain any audio information, that is, determine whether the current system is to play sound. When sound playback is required, the operation of the audio processing circuit can be maintained; when remote sound playback is not required, the operation of the audio processing circuit can be paused to save power consumption. Because the relevant sensing circuit and control circuit used to monitor the audio input signal in the present invention are in the processing of small signals, it can be operated with a low voltage source, so that the power consumption is less; relatively, the audio amplification circuit can be saved As for power consumption, overall, the purpose of saving power can still be achieved. The embodiments of the present invention will be described in detail below with reference to the drawings. [First Embodiment] Fig. 1 shows a detailed circuit diagram of an audio processing circuit and a power saving device in the first embodiment. In the case handled in the first embodiment, the main feature is that the mono audio input signal VI and the audio amplifier circuit are constituted by discrete electronic parts. After the completion of the Zou Central Standards Bureau KX. 消 # 'cooperation. Du Yin 昶 The entire audio processing circuit is composed of a speaker 1, an audio amplifier circuit 2, and a buffer circuit 3. The buffer circuit 3 is a selectively arranged circuit, which is composed of an operational amplifier OP2, and is mainly used to buffer the input of the audio input signal vi. The audio amplifier circuit 2 is connected to the buffer circuit 3, and is used for receiving the processed audio input signal VI, and after being amplified, it is output to the speaker 1 for sound playback. As mentioned earlier, in this embodiment, the audio amplifier circuit 2 is composed of individual electronic parts, including an operational amplifier OP1, resistors IU to R4, and capacitors C1 to C3. Among them, capacitor C1 and capacitor C2 are used as a DC-blocking capacitor, and capacitor C3 is used as a high-frequency coupling capacitor. The resistors IU ~ R4 and the operational amplifier OP1 are the main paper standards applicable to the Chinese Standard (CNS) 怙 (210x2 < m, > ^) --- 1 --- Consumption by employees of the Central Bureau of Standards and Technology Cooperative seal 敕 Α7 Β7 V. Description of the invention (5) The audio amplifier section 'where the resistor and resistor R2 provide a reference voltage to the noninverting terminal of the operational amplifier OP1 in a divided voltage manner. Therefore, the amplification of the audio input signal VI by the audio amplifier circuit 2 can be determined according to the reference voltage value and the resistance value ratio between the resistor R3 and the resistor R4 coupled between the inverting input terminal and the output terminal. Gain. Another important parameter in the audio amplifier circuit 2 is the voltage source VA provided to the operational amplifier OP1. The voltage source VA is higher than a general voltage source VCC (for example, a power source for supplying power to the operational amplifier OP2), and the operational amplifier OP2 can perform amplification only when the voltage source VA is provided. In this embodiment, 'the purpose is to enable or disable the audio amplifier circuit 2 mainly through the control of the voltage source VA. In Fig. 1, the entire power saving device includes a preamplifier circuit 5, an audio sensing circuit 7, a delay circuit 9, and a power control circuit 10. The following describes the actual structure of each circuit and its corresponding functions and actions in order. The pre-amplifier circuit 5 is a selectively provided circuit, which is mainly used to preliminarily amplify the audio input signal VI. The preamplifier circuit 5 includes an operational amplifier OP3, resistors R5 to R8, and capacitors C4 and C5. The functions of the electronic components in the preamplifier circuit 5 are similar to those of the audio amplifier circuit 2 ', so they will not be repeated here. The main difference between the preamplifier circuit 5 and the audio amplifier circuit 2 is that the bias voltage source used is different. "The preamplifier circuit 5 mainly uses a lower voltage voltage source VCC, because its role is not to provide power. Amplifier, so its power consumption is still much lower than the audio amplifier circuit 2. Finally, the preamplifier circuit 5 outputs the amplified audio input signal V2 to the audio sensing circuit 7 of the next stage. The Jin frequency sensing circuit 7 is mainly used to detect whether the audio input signal has this paper size. The Chinese standard (CNS) is applicable to the current standard (2IOX2y \. ≫ tt (# 先 间 读 背后 的 cautions and then 4¾ (This page)
4 ^ 902 T - 經 濟 部 中 k 標 準 為 員 X 消 費 合 印 Λ7 B? ————------- - - ·— — __ — 五、發明説明（6 ) 實際的音頻訊息，其包括運算放大器〇P4以及電阻器 R9〜R11。電阻器R9和電阻器R10構成一分壓電路，用來 產生一參考電壓送到運算放大器OP4的反相輸入端。來自 前置放大電路5的放大後音頻輸入信號V2則是送到運算放 大器OP4的非反栢輸入端。運算放大器〇p4根據其反相輸 入端和非反相輸入端上電壓的差異，產生指示信號V3。當 音頻輸入信號VI中不包含任何音頻訊息時，則放大後音頻 輸入信號V2會低於由電阻器R9和Ri〇所分壓產生的分壓 電壓，而運算放大器OP4的輸出端則輸出低準位的指示信 號V3，用來表示此一情況。另一方面，當音頻輸入信號V1 中包含音頻訊息時，則放大後音頻輸入信號V2會高於由電 阻器R9和R10所分壓產生的分壓電壓，而運算放大器〇p4 的輸出知則會輸出高準位的指示信號V3。藉此，指示信號 V3即可以表示音頻輸入信號V1内是否包含音頻訊息。 延遲電路9亦為一選擇性設置的電路，用來延遲指示信 號V3，並且輸出延遲後指示信號V4到電源控制電路〖〇。 延遲電路9包括處理指示信號V3的部分（亦即電阻器Ri2、 電阻器R13、二極體D1和電容器C6)以及比較電路部分（電 阻器R14、電阻器ί〇5以及運算放大器〇p5)。 電源控制電路10則是根據輸入的延遲後指示信號V4， 以便控制電壓源VA是否提供電力至音頻放大電路2上。如 圖所示，電源控制電路1〇主要是由一個提昇電阻Riq耦接 到電壓源VH)以及功率電晶體ρι所構成。在本實施例中， 功率電晶體P1是做為一功率開關之用，可以利用像 SI9410DY (功率電晶體進行組裝。當延遲後指示信號μ 本紙張尺度適用中關} -----------产------ΐχ~------¾ (計1聞讀背而之注Jt-Ji-事項存4艿本I ) α 3 90 2 7 ^ Α7 Β7 五、發明説明（7 ) 表示目前的音頻輸入信號V1有任何音頻訊息時，功率電晶 體P1會使電壓源VA繼續提供電力至音頻放大電路2，使 其進行音頻放大。當延遲後指示信號V4表示目前的音頻輸 入信號VI沒有音頻訊息時，功率電晶體pi則會將電壓源 VA導向另一端，而使得音頻放大電路2沒有足夠的電力繼 續進行啟動，藉此來暫停音頻放大電路2。 第1圖中省電裝置的整體動作可以簡單描述如下。當指 示信號V3表示音頻輸入信號VI中不存在音頻訊息時，則 電源控制電路10可以控制電壓源VA，使其不提供電力至 音頻放大電路2。當指示信號V3表示音頻輸入信號vi存 在音頻訊息時，電源控制電路10則可以控制電壓源VA， 使其提供電力至音頻放大電路2。藉此，音頻放大電路2是 否維持動作，必須視目前的音頻輸入信號V1是否存在有效 的音頻訊息而定，所以便能夠達到本發明之目的。 【第二實施例】 第2圖表示第二實施例中音頻處理電路和省電裝置的詳 細電路圖。在第二實施例中所處理的情況中，主要在於音頻 輸入信號（包括右聲道音頻信號Via和左聲道音頻信號vi匕） 為立體聲，以及實際音頻放大電路是以音頻放大 IC(integrated circuit，積體電路)所構成。 整個音頻處理電路是由處理右聲道音頻信號Vla之緩衝 電路3a、處理左聲道音頻信號Vlb的緩衝電路3b、音頻放 大1C 20、右聲道揚聲器la和左聲道揚聲器lb所構成。類 似與第一實施例中的情況，緩衝電路3a和3b爲一選擇性設 本紙張尺度適用中國國家標準（CNS )以規棉（2]0X297公灯） (¾1間讀许而之注意事項办填寫本頁4 ^ 902 T-The K standard in the Ministry of Economic Affairs is X. Consumption Λ7 B? ————---------·-— __ — V. Description of the invention (6) The actual audio message, which Including operational amplifier 〇P4 and resistors R9 ~ R11. The resistor R9 and the resistor R10 form a voltage dividing circuit for generating a reference voltage to be supplied to the inverting input terminal of the operational amplifier OP4. The amplified audio input signal V2 from the preamplifier circuit 5 is sent to the non-inverting input terminal of the operational amplifier OP4. The operational amplifier Op4 generates an indication signal V3 according to the difference in voltage between its inverting input and non-inverting input. When the audio input signal VI does not contain any audio information, the amplified audio input signal V2 will be lower than the divided voltage generated by the resistor R9 and Ri〇, and the output of the operational amplifier OP4 will output a low accuracy. The bit indicating signal V3 is used to indicate this situation. On the other hand, when the audio input signal V1 contains audio information, the amplified audio input signal V2 will be higher than the divided voltage generated by the resistors R9 and R10, and the output of the op amp oop4 will output High level indicator V3. Therefore, the indication signal V3 can indicate whether the audio input signal V1 contains audio information. The delay circuit 9 is also a selectively set circuit for delaying the indication signal V3 and outputting the delayed indication signal V4 to the power supply control circuit [0]. The delay circuit 9 includes a portion that processes the instruction signal V3 (that is, a resistor Ri2, a resistor R13, a diode D1, and a capacitor C6) and a comparison circuit portion (a resistor R14, a resistor O5, and an operational amplifier 0p5). The power control circuit 10 is configured to control whether the voltage source VA supplies power to the audio amplifier circuit 2 according to the input delay instruction signal V4. As shown in the figure, the power control circuit 10 is mainly composed of a boost resistor Riq coupled to a voltage source VH) and a power transistor ρ. In this embodiment, the power transistor P1 is used as a power switch. It can be assembled using SI9410DY (power transistor. When the signal is delayed after the delay μ, the paper size applies to Zhongguan} ------- ---- Production ------ ΐχ ~ ------ ¾ (Count 1 note and read the back Jt-Ji- Matter 4 transcript I) α 3 90 2 7 ^ Α7 Β7 V. Invention description (7) indicates that when the current audio input signal V1 has any audio information, the power transistor P1 will cause the voltage source VA to continue to provide power to the audio amplifier circuit 2 for audio amplification. When the delay indicates the signal V4 indicates the current When there is no audio signal in the audio input signal VI, the power transistor pi will lead the voltage source VA to the other end, so that the audio amplifier circuit 2 does not have enough power to continue to start, thereby pausing the audio amplifier circuit 2. Figure 1 The overall operation of the Chinese power-saving device can be briefly described as follows. When the indication signal V3 indicates that there is no audio message in the audio input signal VI, the power control circuit 10 can control the voltage source VA so that it does not provide power to the audio amplifier circuit 2. When the indication signal V3 indicates audio output When there is an audio message in the input signal vi, the power control circuit 10 can control the voltage source VA to provide power to the audio amplifier circuit 2. Therefore, whether the audio amplifier circuit 2 maintains operation depends on whether the current audio input signal V1 exists The effective audio message is determined so that the object of the present invention can be achieved. [Second Embodiment] Fig. 2 shows a detailed circuit diagram of an audio processing circuit and a power saving device in the second embodiment. The processing in the second embodiment In the case, the audio input signal (including the right channel audio signal Via and the left channel audio signal vi) is stereo, and the actual audio amplifier circuit is an audio amplifier IC (integrated circuit). The entire audio processing circuit is composed of a buffer circuit 3a that processes the right channel audio signal Vla, a buffer circuit 3b that processes the left channel audio signal Vlb, an audio amplifier 1C 20, a right channel speaker la, and a left channel speaker lb. Similar As is the case in the first embodiment, the buffer circuits 3a and 3b are a selective setting of the paper size and are applicable to the Chinese National Standard (CNS) Regulation Cotton (2] 0X297 known lamp) (¾1 promised between read and fill in the page do Note
、1T 經濟部中央標率局員工消费合作社印鉍 Λ3 902 7 Λ7 Η 7 五、發明説明（8 ) ^ 置的電路，分別利用運算放大器〇P2a和〇P2b所構成，藉 以緩衝右聲道音頻信號Via和左聲道音頻信號v讣的輸入。 音頻放大1C 20則透過端點RLINE和LLINE連接於緩衝電 路3a和3b，分別接收處理後的右聲道音頻信號Vla和左聲 道骨頻信號V1 b。在經過放大後，則分別由端點R〇UT和 LOUT透過右聲道揚聲器la和左聲道揚聲器a進行聲音的 播放。 第一實施例與第一實施例之音頻處理電路間主要差異， 是在於利用現有的音頻放大1C 20來進行音頻放大。因此， 除了可以利用類似於第一實施例中以電源控制來關閉音訊放 大相關電路之外，也能夠利用一般音頻放大IC所具有關閉 控制端（shutdown)來進行開關控制。在本實施例中，便是以 音頻放大1C的關閉控制端來進行開關控制。 本實施例中的省電控制裝置則包括用來處理右聲道音頻 信號Via的前置放大電路5a和音頻感測電路7a、用來處理 左聲道音頻信號Vlb的前置放大電路5b和音頻感測電路 7b、以及延遲電路9。在電路結構上，第2圖中的前置放大 電路5a和前置放大電路5b與第丨圖中的前置放大電路5相 同，第2圖中的音頻感測電路7a和音頻感測電路％則與第 1圖中的音頻感測電路7相同，並且第2圖中的延遲電路9 則與第1圖中的延遲電路9相同，因此其内部動作不再贅述。 右聲道音頻信號Via和左聲道音頻信號Vlb —方面透過 緩衝電路3a和緩衝電路3b送到音頻放大IC 2〇的輸入端 RLINE和LLINE，另一方面則是送到前置放大電路&和汕 進行初級放大後（V2a、V2b)，再利用音頻感測電路、和7b - 10 - ^張尺度適用中國國家標準（CNS ) 2丨〇 X 29ϋη------------- "J'int閱请斤而之;1念事項^43本^( -I S.衣一 經濟部中央標"-局員工消費合作社印製 439027 Λ7 __________B? 五、發明説明（9 ) 進行檢測，產生所需要的指示信號V30。音頻感測電路7a 和7b是以wire-〇R方式產生指示信號v30。亦即，當右聲 道音頻彳§號Via或是左聲道晋頻信號να中任一者包含音 頻訊息，指示信號V30就會呈高準位；反之，當右聲道音 頻信號Via和左聲道音頻信號Vlb都不包含音頻訊息時， 指示信號V30即呈低準位。 電阻器幻7爲提昇電阻。指示信號V30在經過延遲電路 9延遲之後，送出延遲後指示信號V30到音頻放大ic 20的 闞閉控制端SD。藉此即可根據左/右聲道的音頻訊息來繼續 或暫停音頻放大1C 20。 第2圖中省電裝置的整體動作可以簡單描述如下。當目 前右聲道音頻信號Via和左聲道音頻信號vib中都不存在 任何音頻訊息時，則指示信號V30可以控制音頻放大ic 20， 使其關閉。當目前右聲道音頻信號Via或是左聲道音頻信 號Vlb中任一者存在音頻訊息時，則指示信號V30可以控 制音頻放大1C 20，使其繼續動作。藉此，音頻放大電路2 是否維持動作，必須視目前的音頻信號VIa和VIb是否存 在有效的音頻訊息而定，所以便能夠達到本發明之目的。 經濟部中央標隼局員工消费合作.社印絜 (請先閱讀背而之注意事項再填寫本頁) 第3圖表示本發明之音頻處理電路省電控制方法的流程 圖。如圖所示，首先，接出由外部所輸入之音頻輸入信號 (S1) ’再判斷此音頻輸入信號中是否包含有音頻訊息（S2)。 上述的音頻輸入信號在立禮聲的情況下包括右聲道音頻信號 和左聲道音頻信號。當音頻輸入信號中確實包含有音頻訊息 時，則產生一指示信號，用來表示目前音頻輸入信號中包含 音頻訊息（S3)，所以根據此指示信號，需要繼續維持音頻放 -11 - 本紙张尺度適用中國國家標萆（CNS ) Λ4規梠（210X2y7*筇） 4 3 902 7 - Λ7 ________ B7 _____ 五、發明説明（1G ) 大電路的動作（S4)。另一方面，當音頻輸入信號中沒有包合 音頻訊息時，則產生一指示信號，用來表示目前音頻輸入信 號中不包含音頻訊息（SS)，所以根據此指示信號，就可以智 停音頻放大電路的動作（S6)，藉此來節省電力的消耗而達到 本發明的目的。 本發明雖以一較佳實施例揭露如上，然其並非用以限定 本發明，任何熟習此項技藝者，在不脫離本發明之精神和範 圍内，當可做些許的更動與潤飾，因此本發明之保護範圍當 視後附之申請專利範圍所界定者為準。 ,*— 1 I -- I -1— H I ·*I I · ...... ^n· ^1« --5¾. f諳先閱讀背面之注意事項蒋填^本vs ) 經濟部十央標"-局員工消费合作社印裝 本紙张尺度適用中囤國家標準（CNS ) A4現格（210X 297公.¾ )1.1T Bismuth of the Consumer Standards Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs, Λ3 902 7 Λ7 Η 7 V. The circuit of the invention (8) ^ uses op amps 0P2a and 0P2b to buffer the right channel audio signal Via and left channel audio signal v 讣 input. The audio amplifier 1C 20 is connected to the buffer circuits 3a and 3b through the endpoints RLINE and LLINE, and receives the processed right channel audio signal Vla and the left channel bone frequency signal V1b, respectively. After being amplified, the sounds are played by the endpoints ROT and LOUT through the right channel speaker la and the left channel speaker a, respectively. The main difference between the first embodiment and the audio processing circuit of the first embodiment is that the existing audio amplification 1C 20 is used for audio amplification. Therefore, in addition to using a power supply control similar to the first embodiment to turn off the audio amplification related circuit, it is also possible to use a shutdown control terminal provided by a general audio amplifier IC to perform switch control. In this embodiment, the switch control is performed by using the shutdown control terminal of the audio amplifier 1C. The power-saving control device in this embodiment includes a preamplifier circuit 5a and an audio sensing circuit 7a for processing the right channel audio signal Via, a preamplifier circuit 5b for processing the left channel audio signal Vlb, and audio. The sensing circuit 7b and the delay circuit 9. In terms of circuit structure, the preamplifier circuit 5a and the preamplifier circuit 5b in FIG. 2 are the same as the preamplifier circuit 5 in the FIG. 丨, and the audio sensing circuit 7a and the audio sensing circuit in FIG. 2% It is the same as the audio sensing circuit 7 in the first figure, and the delay circuit 9 in the second figure is the same as the delay circuit 9 in the first figure, so its internal operation will not be described again. The right channel audio signal Via and the left channel audio signal Vlb are sent to the input terminals RLINE and LLINE of the audio amplifier IC 20 through the buffer circuit 3a and the buffer circuit 3b, and to the preamp circuit & After the primary amplification (V2a, V2b) with Shanshan, and then use the audio sensing circuit, and 7b-10-^ Zhang scale applicable to the Chinese National Standard (CNS) 2 丨 〇X 29ϋη ----------- -" J'int please read it carefully; 1 item ^ 43 copies ^ (-I S. Central Standard of Yiyi Ministry of Economy " -Printed by the Bureau ’s Consumer Cooperatives 439027 Λ7 __________B? 5. Description of the invention (9 ) Perform detection to generate the required indication signal V30. The audio sensing circuits 7a and 7b generate the indication signal v30 in a wire-OR manner. That is, when the right channel audio 彳 § Via or left channel frequency If any of the signals να contains audio information, the indication signal V30 will be at a high level. Conversely, when the right channel audio signal Via and the left channel audio signal Vlb do not contain audio information, the indication signal V30 will be at a low level. The resistor 7 is a boost resistor. After the indication signal V30 is delayed by the delay circuit 9, After the delay, the indication signal V30 reaches the closed control terminal SD of the audio amplification ic 20. This allows the audio amplification of the left / right channel to continue or pause the audio amplification 1C 20. The overall action of the power saving device in the second figure It can be briefly described as follows. When there is no audio information in the right channel audio signal Via and the left channel audio signal vib, the indication signal V30 can control the audio amplification ic 20 to turn it off. When the current right channel audio When there is an audio signal in either the signal Via or the left-channel audio signal Vlb, the instruction signal V30 can control the audio amplification 1C 20 to make it continue to operate. Therefore, whether the audio amplification circuit 2 maintains the operation depends on the current The audio signals VIa and VIb depend on whether there is a valid audio message, so that the purpose of the present invention can be achieved. Employees of the Central Bureau of Standards, Ministry of Economic Affairs, Consumer Co-operation. Fig. 3 shows a flowchart of a power-saving control method of the audio processing circuit of the present invention. As shown in the figure, first, an audio input signal (S1) input from the outside is received; Determine whether the audio input signal contains audio information (S2). The above-mentioned audio input signal includes a right channel audio signal and a left channel audio signal in the case of a ritual sound. When the audio input signal does contain audio information At this time, an indication signal is generated to indicate that the current audio input signal contains audio information (S3), so according to this indication signal, the audio amplifier needs to be maintained. -11-This paper standard applies to the Chinese National Standard (CNS) Λ4 regulation. 210 （210X2y7 * 筇） 4 3 902 7-Λ7 ________ B7 _____ 5. Explanation of the invention (1G) Operation of large circuit (S4). On the other hand, when no audio information is included in the audio input signal, an indication signal is generated to indicate that the current audio input signal does not include audio information (SS), so according to this indication signal, the audio amplification can be stopped intelligently. The operation of the circuit (S6), thereby saving power consumption and achieving the object of the present invention. Although the present invention is disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and retouches without departing from the spirit and scope of the present invention. The scope of protection of the invention shall be determined by the scope of the attached patent application. , * — 1 I-I -1— HI · * II · ...... ^ n · ^ 1 «--5¾. F 谙 Read the notes on the back first. Standard "-Bureau employee consumer cooperatives printed this paper standard applicable to the national standard (CNS) A4 (210X 297 male. ¾)