TW202223623A - Audio control circuit and associated control method - Google Patents

Audio control circuit and associated control method Download PDF

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TW202223623A
TW202223623A TW110110561A TW110110561A TW202223623A TW 202223623 A TW202223623 A TW 202223623A TW 110110561 A TW110110561 A TW 110110561A TW 110110561 A TW110110561 A TW 110110561A TW 202223623 A TW202223623 A TW 202223623A
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host device
circuit
operating
stage
processing circuit
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TW110110561A
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TWI779530B (en
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陳科維
曹倫誠
林啟義
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瑞昱半導體股份有限公司
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Priority to US17/363,010 priority Critical patent/US11929722B2/en
Priority to JP2021117279A priority patent/JP7235810B2/en
Priority to EP21187830.1A priority patent/EP4012550A1/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/16—Sound input; Sound output
    • G06F3/162—Interface to dedicated audio devices, e.g. audio drivers, interface to CODECs
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/382—Information transfer, e.g. on bus using universal interface adapter

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  • Audiology, Speech & Language Pathology (AREA)
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Abstract

The present invention provides an audio control circuit, wherein the audio control circuit includes an USB interface and a processing circuit. The USB interface is used to connect to a host device. The processing circuit is configured to perform enumeration with the host device via the USB interface, and the processing circuit is further configured to determine if the host device operates in a BIOS phase or an operating system phase to generate a control signal. When the processing circuit determines that the host device operates in the BIOS phase, the processing circuit generates the control signal to enable a de-pop circuit; and When the processing circuit determines that the host device operates in the operating system phase, the processing circuit generates the control signal to disable the de-pop circuit.

Description

音訊控制電路及相關的控制方法Audio control circuit and related control method

本發明係有關於具有通用序列匯流排(Universal Serial Bus，USB)介面的音訊控制電路。The present invention relates to an audio control circuit with a Universal Serial Bus (USB) interface.

在本身具有揚聲器或是連接到外部揚聲器的電子裝置中，當電子裝置開機時，內部音訊控制電路的編解碼器或相關電路在初始化過程可能會產生雜訊，因而使得揚聲器出現爆音(pop sound)現象，造成使用者的不適。為了解決此一問題，可以在音訊控制電路的周邊設置一個爆音抑制電路(de-pop circuit)，以降低或消除爆音現象。然而，由於目前有部分的音訊控制電路逐漸開始採用USB介面，而如何利用具有USB介面的音訊控制電路來準確地控制爆音抑制電路的操作，以有效地抑制爆音現象且不會影響到正常的音訊播放，是一個重要的課題。In an electronic device with its own speaker or connected to an external speaker, when the electronic device is turned on, the codec or related circuits of the internal audio control circuit may generate noise during the initialization process, resulting in a pop sound of the speaker. phenomenon, causing discomfort to the user. In order to solve this problem, a de-pop circuit can be arranged around the audio control circuit to reduce or eliminate the de-pop phenomenon. However, since some audio control circuits gradually begin to use the USB interface, how to use the audio control circuit with the USB interface to accurately control the operation of the pop suppression circuit, so as to effectively suppress the pop phenomenon without affecting the normal audio Playback is an important subject.

因此，本發明的目的之一在於提出一種音訊控制電路，其可以根據來自主裝置的訊號來判斷目前電子裝置是操作在基本輸入輸出系統(Basic Input/Output System，BIOS)階段或是作業系統階段，以供控制爆音抑制電路，以解決先前技術中所述的問題。Therefore, one of the objectives of the present invention is to provide an audio control circuit, which can determine whether the current electronic device is operating in the Basic Input/Output System (BIOS) stage or the operating system stage according to the signal from the host device. , to control the pop suppression circuit to solve the problems described in the prior art.

在本發明的一實施例中，揭露了一種音訊控制電路，其中該音訊控制電路包含了一USB介面電路以及一處理電路。該USB介面電路用以連接至一主裝置，且該處理電路用以透過該USB介面電路與該主裝置進行列舉操作，並透過與該主裝置在列舉過程中的封包內容來判斷該主裝置是操作於一BIOS階段或是一作業系統階段，以供產生一控制訊號；其中當該處理電路判斷該主裝置操作於該BIOS階段時，該處理電路產生該控制訊號以開啟一爆音抑制電路；以及當該處理電路判斷該主裝置操作於該作業系統階段時，該處理電路產生該控制訊號以關閉該爆音抑制電路。In an embodiment of the present invention, an audio control circuit is disclosed, wherein the audio control circuit includes a USB interface circuit and a processing circuit. The USB interface circuit is used to connect to a host device, and the processing circuit is used to perform enumeration operations with the host device through the USB interface circuit, and determine whether the host device is the host device through the packet content with the host device during the enumeration process. operating in a BIOS stage or an operating system stage for generating a control signal; wherein when the processing circuit determines that the host device is operating in the BIOS stage, the processing circuit generates the control signal to turn on a pop suppression circuit; and When the processing circuit determines that the main device is operating in the operating system stage, the processing circuit generates the control signal to turn off the pop suppression circuit.

在本發明的另一實施例中，揭露了一種應用於一音訊控制電路的控制方法，其包含有以下步驟：透過一USB介面電路來與一主裝置進行列舉操作；透過與該主裝置在列舉過程中的封包內容來判斷該主裝置是操作於一BIOS階段或是一作業系統階段；當判斷該主裝置操作於該BIOS階段時，產生一控制訊號以開啟一爆音抑制電路；以及當判斷該主裝置操作於該作業系統階段時，產生該控制訊號以關閉該爆音抑制電路。In another embodiment of the present invention, a control method applied to an audio control circuit is disclosed, which includes the following steps: performing an enumeration operation with a host device through a USB interface circuit; The packet content in the process determines whether the host device is operating in a BIOS stage or an operating system stage; when it is determined that the host device is operating in the BIOS stage, a control signal is generated to turn on a pop suppression circuit; and when it is determined that the host device is operating in the BIOS stage When the main device operates in the operating system stage, the control signal is generated to close the pop suppression circuit.

第1圖為根據本發明一實施例之電子裝置的示意圖。如第1圖所示，電子裝置包含了一主裝置102、一音訊控制電路100、一爆音抑制電路104以及一揚聲器106，其中音訊控制電路100包含了一USB介面電路110、一處理電路120以及一特定接腳130。在本實施例中，電子裝置可以是一電腦主機、一筆記型電腦或是其他任何具有聲音播放功能的電子裝置，而音訊控制電路100係為主機板上所內建的音訊裝置，亦即主裝置102、音訊控制電路100及爆音抑制電路104係製作在一主機板上；此外，揚聲器106可以是外接於電子裝置、或是內建於電子裝置的擴音裝置。FIG. 1 is a schematic diagram of an electronic device according to an embodiment of the present invention. As shown in FIG. 1, the electronic device includes a host device 102, an audio control circuit 100, a pop suppression circuit 104 and a speaker 106, wherein the audio control circuit 100 includes a USB interface circuit 110, a processing circuit 120 and A specific pin 130 . In this embodiment, the electronic device can be a computer host, a notebook computer, or any other electronic device with a sound playback function, and the audio control circuit 100 is an audio device built on the motherboard, that is, the main The device 102 , the audio control circuit 100 and the pop suppression circuit 104 are fabricated on a motherboard; in addition, the speaker 106 may be an externally connected electronic device or a built-in sound amplification device in the electronic device.

在本實施例中，主裝置102可以是電子裝置內的一處理器晶片組，其透過USB介面連接至音訊控制電路100的USB介面電路110，且主裝置102係將音訊訊號透過USB介面電路110傳送至處理電路120進行相關的處理(例如，編解碼等處理)後，產生輸出音訊訊號Vout至揚聲器106進行播放。然而，如先前技術中所述，當電子裝置開機時，音訊控制電路100的編解碼器或相關電路在初始化過程可能會產生雜訊，因而使得揚聲器106出現爆音現象，因此，本實施例的音訊控制電路100可以透過與主裝置102在列舉(enumerate)過程中的封包內容來判斷主裝置102是操作在BIOS階段或是作業系統階段，以供產生控制訊號Vc來控制爆音抑制電路104來阻斷輸出音訊訊號Vout傳送至揚聲器106、或是降低輸出音訊訊號Vout的音量，以避免電子裝置在開機時出現爆音現象而造成使用者不適。具體來說，當處理電路120透過與主裝置102在列舉過程中的封包內容判斷目前主裝置102是操作在BIOS階段，則處理電路120產生控制訊號Vc以開啟爆音抑制電路104來阻斷輸出音訊訊號Vout傳送至揚聲器106、或是降低輸出音訊訊號Vout的音量；而當處理電路120透過與主裝置102在列舉過程中的封包內容判斷目前主裝置102是操作在作業系統階段，則處理電路120產生控制訊號Vc以關閉爆音抑制電路104，亦即輸出音訊訊號Vout可以直接被傳送至揚聲器106進行播放。In this embodiment, the host device 102 may be a processor chip set in the electronic device, which is connected to the USB interface circuit 110 of the audio control circuit 100 through a USB interface, and the host device 102 transmits audio signals through the USB interface circuit 110 After being transmitted to the processing circuit 120 for related processing (eg, processing such as encoding and decoding), an output audio signal Vout is generated to the speaker 106 for playback. However, as described in the prior art, when the electronic device is powered on, the codec or related circuits of the audio control circuit 100 may generate noise during the initialization process, thus causing the speaker 106 to pop. The control circuit 100 can determine whether the host device 102 is operating in the BIOS stage or the operating system stage through the packet content during the enumerate process with the host device 102, so as to generate the control signal Vc to control the pop suppression circuit 104 to block The output audio signal Vout is sent to the speaker 106, or the volume of the output audio signal Vout is reduced, so as to prevent the electronic device from popping and causing discomfort to the user. Specifically, when the processing circuit 120 determines that the host device 102 is currently operating in the BIOS stage through the packet content with the host device 102 during the enumeration process, the processing circuit 120 generates the control signal Vc to turn on the pop suppression circuit 104 to block the output audio The signal Vout is sent to the speaker 106, or the volume of the output audio signal Vout is reduced; and when the processing circuit 120 determines that the main device 102 is currently operating in the operating system stage through the packet content with the main device 102 during the enumeration process, the processing circuit 120 The control signal Vc is generated to turn off the pop suppression circuit 104, that is, the output audio signal Vout can be directly transmitted to the speaker 106 for playback.

在本實施例中，音訊控制電路100本身係為一晶片，而特定接腳130為該晶片之多個接腳中的其一，且爆音抑制電路104係設置於音訊控制電路100之外。然而，在另一實施例中，音訊控制電路100與爆音抑制電路104也可以設置在同一個晶片中，亦即音訊控制電路100所產生的控制訊號Vc透過晶片內部的走線傳送至爆音抑制電路104，而不需要透過特定接腳130，這些設計上的變化均隸屬於本發明的範疇。In this embodiment, the audio control circuit 100 itself is a chip, and the specific pin 130 is one of a plurality of pins of the chip, and the pop suppression circuit 104 is disposed outside the audio control circuit 100 . However, in another embodiment, the audio control circuit 100 and the pop suppression circuit 104 can also be arranged in the same chip, that is, the control signal Vc generated by the audio control circuit 100 is transmitted to the pop suppression circuit through the internal wiring of the chip 104 without the need for specific pins 130, these design changes belong to the scope of the present invention.

第2圖為根據本發明一實施例之控制方法的流程圖。於步驟200，流程開始，且電子裝置上電進行初始化操作。在步驟202，主裝置202與音訊控制電路100開始進行列舉過程，在列舉過程中，主裝置102會傳送USB封包至音訊控制電路100並分配一個位址；接著，音訊控制電路100會回報主裝置102以告知本身是具有音訊功能的裝置，並傳送相關的資訊置主裝置102，例如所支援的配置(Configuration)個數、供應商身分(vendor ID)、產品身分(product ID)、取樣率(sample rate)、音量範圍(volume range)...等等；最後，主裝置102識別音訊控制電路100的類別，並傳送USB音訊類別(USB audio class，UAC)相關封包至音訊控制電路100。在一實施例中，UAC相關封包指的是主裝置102在完成識別音訊控制電路100的類別後，所產生之供音訊控制電路100使用/處理的資料封包或是用來控制音訊控制電路100操作的封包，例如設定音訊控制電路100的音量大小值、設定音訊控制電路100的裝置是靜音或取消靜音(mute or unmute)、設定音訊控制電路100的當下操作的取樣率(sample rate)。需注意的是，由於本領域具有通常知識者應能了解列舉過程詳細操作，再加上本實施例的重點在於利用列舉過程中的封包內容來判斷是否開啟/關閉爆音抑制電路104，故上述內容僅描述了列舉過程中與本實施例相關主要操作，而列舉過程的其他細節在此不贅述。FIG. 2 is a flowchart of a control method according to an embodiment of the present invention. In step 200, the process starts, and the electronic device is powered on to perform an initialization operation. In step 202, the host device 202 and the audio control circuit 100 start the enumeration process. During the enumeration process, the host device 102 sends a USB packet to the audio control circuit 100 and assigns an address; then, the audio control circuit 100 reports back to the host device 102 to inform itself that it is a device with audio function, and send relevant information to the main device 102, such as the number of supported configurations (Configuration), vendor ID (vendor ID), product ID (product ID), sampling rate ( Finally, the host device 102 identifies the type of the audio control circuit 100 and transmits a USB audio class (UAC) related packet to the audio control circuit 100 . In one embodiment, the UAC-related packet refers to a data packet generated by the host device 102 for use/processing by the audio control circuit 100 after identifying the type of the audio control circuit 100 or used to control the operation of the audio control circuit 100 For example, set the volume value of the audio control circuit 100, set the device of the audio control circuit 100 to mute or unmute, and set the sample rate of the current operation of the audio control circuit 100. It should be noted that, since those with ordinary knowledge in the art should be able to understand the detailed operation of the enumeration process, and the focus of this embodiment is to use the packet content in the enumeration process to determine whether to turn on/off the pop suppression circuit 104, the above content Only the main operations related to this embodiment in the enumeration process are described, and other details of the enumeration process are not repeated here.

在步驟204中，處理電路120判斷目前是否已接經收到UAC相關封包，若否，流程進入步驟206；若是，流程進入步驟212。在步驟206中，由於處理電路120尚未接收到UAC相關封包，故處理電路120判斷目前主裝置102或是處理器操作在BIOS階段，亦即主裝置102尚未完成識別音訊控制電路100的相關操作。在步驟208，處理電路120產生控制訊號Vc以開啟爆音抑制電路104來阻斷輸出音訊訊號Vout傳送至揚聲器106、或是降低輸出音訊訊號Vout的音量。在步驟210，主裝置102通知音訊控制電路100進行列舉操作，且流程回到步驟202。In step 204 , the processing circuit 120 determines whether the UAC-related packet has been received at present, if not, the process proceeds to step 206 ; if so, the process proceeds to step 212 . In step 206 , since the processing circuit 120 has not received the UAC related packet, the processing circuit 120 determines that the host device 102 or the processor is currently operating in the BIOS stage, that is, the host device 102 has not completed the related operations of identifying the audio control circuit 100 . In step 208, the processing circuit 120 generates the control signal Vc to turn on the pop suppression circuit 104 to block the transmission of the output audio signal Vout to the speaker 106, or reduce the volume of the output audio signal Vout. In step 210 , the host device 102 notifies the audio control circuit 100 to perform the enumeration operation, and the process returns to step 202 .

在步驟212，由於處理電路120已經接收到UAC相關封包，故處理電路120判斷目前主裝置102或是處理器操作在作業系統階段，亦即主裝置102已經完成識別音訊控制電路100的相關操作，且以Microsoft Windows作業系統來說，處理電路120可以判斷目前電子裝置的螢幕已經顯示了Windows視窗介面。在步驟214，處理電路120產生控制訊號Vc以關閉爆音抑制電路104，亦即，爆音抑制電路104不會阻斷輸出音訊訊號Vout傳送至揚聲器106或是降低輸出音訊訊號Vout的音量，且輸出音訊訊號Vout可以直接被傳送至揚聲器106進行播放。在步驟216，若是主裝置102通知音訊控制電路100重新進行列舉操作，則流程回到步驟202。In step 212, since the processing circuit 120 has received the UAC-related packet, the processing circuit 120 determines that the main device 102 or the processor is currently operating in the operating system stage, that is, the main device 102 has completed the relevant operation of identifying the audio control circuit 100, In the case of Microsoft Windows operating system, the processing circuit 120 can determine that the current screen of the electronic device has displayed the Windows interface. In step 214, the processing circuit 120 generates the control signal Vc to turn off the pop suppression circuit 104, that is, the pop suppression circuit 104 does not block the transmission of the output audio signal Vout to the speaker 106 or reduce the volume of the output audio signal Vout, and outputs the audio signal The signal Vout can be directly sent to the speaker 106 for playback. In step 216 , if the host device 102 notifies the audio control circuit 100 to perform the enumeration operation again, the flow returns to step 202 .

簡要歸納本發明，在本發明之音訊控制電路及相關的控制方法中，音訊控制電路係根據是否已經接收到UAC相關封包來判斷主裝置是操作在BIOS階段或是作業系統階段，並在判斷主裝置操作在BIOS階段時開啟爆音抑制電路以避免爆音現象而造成使用者不適，且在判斷主裝置操作在作業系統階段時關閉爆音抑制電路以使得揚聲器可以正常播放音訊訊號。透過本發明，可以簡單有效地讓具有USB介面的音訊控制電路達到避免爆音現象的功能。 以上所述僅為本發明之較佳實施例，凡依本發明申請專利範圍所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。 To briefly summarize the present invention, in the audio control circuit and related control method of the present invention, the audio control circuit determines whether the main device is operating in the BIOS stage or the operating system stage according to whether the UAC related packet has been received, and determines whether the main device is operating in the BIOS stage or the operating system stage. When the device is operating in the BIOS stage, the pop suppression circuit is turned on to avoid user discomfort caused by the pop phenomenon, and when it is judged that the main device is operating in the operating system stage, the pop suppression circuit is turned off so that the speaker can play audio signals normally. Through the present invention, the audio control circuit with the USB interface can simply and effectively achieve the function of avoiding the popping sound phenomenon. The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

100:音訊控制電路 102:主裝置 104:爆音抑制電路 106:揚聲器 110:USB介面電路 120:處理電路 130:特定接腳 200~216:步驟 Vc:控制訊號 Vout:輸出音訊訊號 100: Audio control circuit 102: Main unit 104: Pop Suppression Circuit 106: Speakers 110: USB interface circuit 120: Processing circuit 130: specific pin 200~216: Steps Vc: control signal Vout: output audio signal

第1圖為根據本發明一實施例之電子裝置的示意圖。 第2圖為根據本發明一實施例之控制方法的流程圖。 FIG. 1 is a schematic diagram of an electronic device according to an embodiment of the present invention. FIG. 2 is a flowchart of a control method according to an embodiment of the present invention.

100:音訊控制電路 100: Audio control circuit

102:主裝置 102: Main unit

104:爆音抑制電路 104: Pop Suppression Circuit

106:揚聲器 106: Speakers

110:USB介面電路 110: USB interface circuit

120:處理電路 120: Processing circuit

130:特定接腳 130: specific pin

Vc:控制訊號 Vc: control signal

Vout:輸出音訊訊號 Vout: output audio signal

Claims (10)

一種音訊控制電路，包含有： 一通用序列匯流排(Universal Serial Bus，USB)介面電路，用以連接至一主裝置； 一處理電路，耦接於該USB介面電路，用以透過該USB介面電路與該主裝置進行列舉(enumerate)操作，並透過與該主裝置在列舉過程中的封包內容來判斷該主裝置是操作於一基本輸入輸出系統(Basic Input/Output System，BIOS)階段或是一作業系統階段，以供產生一控制訊號； 其中當該處理電路判斷該主裝置操作於該BIOS階段時，該處理電路產生該控制訊號以開啟一爆音抑制電路；以及當該處理電路判斷該主裝置操作於該作業系統階段時，該處理電路產生該控制訊號以關閉該爆音抑制電路。 An audio control circuit, comprising: a Universal Serial Bus (USB) interface circuit for connecting to a host device; A processing circuit, coupled to the USB interface circuit, is used to perform an enumerate operation with the host device through the USB interface circuit, and determine whether the host device is operating through the packet content with the host device during the enumeration process. In a Basic Input/Output System (BIOS) stage or an operating system stage, for generating a control signal; Wherein, when the processing circuit determines that the main device is operating in the BIOS stage, the processing circuit generates the control signal to turn on a pop suppression circuit; and when the processing circuit determines that the main device is operating in the operating system stage, the processing circuit The control signal is generated to close the pop suppression circuit. 如申請專利範圍第1項所述之音訊控制電路，其中該處理電路根據是否自該主裝置接收到一USB音訊類別(USB audio class，UAC)相關封包來判斷該主裝置是操作於該BIOS階段或是該作業系統階段，以產生該控制訊號。The audio control circuit as described in claim 1, wherein the processing circuit determines whether the host device is operating in the BIOS stage according to whether a USB audio class (UAC) related packet is received from the host device or the operating system stage to generate the control signal. 如申請專利範圍第2項所述之音訊控制電路，其中若是該處理電路未接收到該UAC相關封包，該處理電路判斷該主裝置操作於該BIOS階段，並產生該控制訊號以開啟該爆音抑制電路；以及若是該處理電路接收到該UAC相關封包，該處理電路判斷該主裝置操作於該作業系統階段，並產生該控制訊號以關閉該爆音抑制電路。The audio control circuit as described in item 2 of the claimed scope, wherein if the processing circuit does not receive the UAC-related packet, the processing circuit determines that the host device is operating in the BIOS stage, and generates the control signal to enable the pop suppression a circuit; and if the processing circuit receives the UAC-related packet, the processing circuit determines that the host device is operating in the operating system stage, and generates the control signal to turn off the pop suppression circuit. 如申請專利範圍第1項所述之音訊控制電路，其中該音訊控制電路係設置於一晶片中，且該處理電路所產生的該控制訊號係透過該晶片的一特定接腳傳送至位於該晶片外的該爆音抑制電路。The audio control circuit as described in item 1 of the scope of application, wherein the audio control circuit is disposed in a chip, and the control signal generated by the processing circuit is transmitted to the chip located on the chip through a specific pin of the chip outside the pop suppression circuit. 如申請專利範圍第1項所述之音訊控制電路，其中該處理電路另用以產生輸出音訊訊號，且當該處理電路判斷該主裝置操作於該BIOS階段時，該處理電路產生該控制訊號以開啟該爆音抑制電路以阻斷該輸出音訊訊號傳送至一揚聲器、或是降低該輸出音訊訊號的音量；以及當該處理電路判斷該主裝置操作於該作業系統階段時，該處理電路產生該控制訊號以關閉該爆音抑制電路，以使得該輸出音訊訊號直接傳送至該揚聲器。The audio control circuit as described in claim 1, wherein the processing circuit is further used to generate an output audio signal, and when the processing circuit determines that the host device is operating in the BIOS stage, the processing circuit generates the control signal to Turn on the pop suppression circuit to block the output audio signal from being transmitted to a speaker, or reduce the volume of the output audio signal; and when the processing circuit determines that the main device is operating in the operating system stage, the processing circuit generates the control signal to turn off the pop suppression circuit, so that the output audio signal is directly transmitted to the speaker. 一種應用於一音訊控制電路的控制方法，包含有： 透過一通用序列匯流排(Universal Serial Bus，USB)介面電路來與一主裝置進行列舉(enumerate)操作； 透過與該主裝置在列舉過程中的封包內容來判斷該主裝置是操作於一基本輸入輸出系統(Basic Input/Output System，BIOS)階段或是一作業系統階段； 當判斷該主裝置操作於該BIOS階段時，產生一控制訊號以開啟一爆音抑制電路；以及 當判斷該主裝置操作於該作業系統階段時，產生該控制訊號以關閉該爆音抑制電路。 A control method applied to an audio control circuit, comprising: Enumerate with a host device through a Universal Serial Bus (USB) interface circuit; Determine whether the host device is operating in a basic input/output system (Basic Input/Output System, BIOS) stage or an operating system stage according to the packet content with the host device during the enumeration process; When it is determined that the host device is operating in the BIOS stage, a control signal is generated to turn on a pop suppression circuit; and When it is determined that the main device is operating at the operating system stage, the control signal is generated to close the pop suppression circuit. 如申請專利範圍第6項所述之控制方法，其中透過與該主裝置在列舉過程中的封包內容來判斷該主裝置是操作於該BIOS階段或是該作業系統階段的步驟包含有： 根據是否自該主裝置接收到一USB音訊類別(USB audio class，UAC)相關封包來判斷該主裝置是操作於該BIOS階段或是該作業系統階段。 The control method as described in item 6 of the scope of the application, wherein the step of determining whether the host device is operating in the BIOS stage or the operating system stage according to the packet content in the enumeration process with the host device includes: According to whether a USB audio class (USB audio class, UAC) related packet is received from the host device, it is determined whether the host device is operating in the BIOS stage or the operating system stage. 如申請專利範圍第7項所述之控制方法，其中根據是否自該主裝置接收到該UAC相關封包來判斷該主裝置是操作於該BIOS階段或是該作業系統階段的步驟包含有： 若是未接收到該UAC相關封包，判斷該主裝置操作於該BIOS階段；以及 若是接收到該UAC相關封包，判斷該主裝置操作於該作業系統階段。 The control method according to item 7 of the claimed scope, wherein the step of determining whether the host device is operating in the BIOS stage or the operating system stage according to whether the UAC-related packet is received from the host device comprises: If the UAC-related packet is not received, determine that the host device is operating in the BIOS stage; and If the UAC related packet is received, it is determined that the master device is operating in the operating system stage. 如申請專利範圍第6項所述之控制方法，其中該音訊控制電路係設置於一晶片中，且該控制訊號係透過該晶片的一特定接腳傳送至位於該晶片外的該爆音抑制電路。The control method as described in claim 6, wherein the audio control circuit is arranged in a chip, and the control signal is transmitted to the pop suppression circuit outside the chip through a specific pin of the chip. 如申請專利範圍第6項所述之控制方法，其中當判斷該主裝置操作於該BIOS階段時，產生該控制訊號以開啟該爆音抑制電路；以及當判斷該主裝置操作於該作業系統階段時，產生該控制訊號以關閉該爆音抑制電路的步驟包含有： 當判斷該主裝置操作於該BIOS階段時，產生該控制訊號以開啟該爆音抑制電路以阻斷一輸出音訊訊號傳送至一揚聲器、或是降低該輸出音訊訊號的音量；以及 當判斷該主裝置操作於該作業系統階段時，產生該控制訊號以關閉該爆音抑制電路，以使得該輸出音訊訊號直接傳送至該揚聲器。 The control method as described in claim 6, wherein when it is determined that the host device is operating in the BIOS stage, the control signal is generated to turn on the pop suppression circuit; and when it is determined that the host device is operating in the operating system stage , the steps of generating the control signal to close the pop suppression circuit include: When it is determined that the host device is operating in the BIOS stage, the control signal is generated to turn on the pop suppression circuit to block the transmission of an output audio signal to a speaker, or reduce the volume of the output audio signal; and When it is determined that the main device is operating in the operating system stage, the control signal is generated to close the pop suppression circuit, so that the output audio signal is directly transmitted to the speaker.
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