TWI746001B - Head-mounted apparatus and stereo effect controlling method thereof - Google Patents

Head-mounted apparatus and stereo effect controlling method thereof Download PDF

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TWI746001B
TWI746001B TW109119461A TW109119461A TWI746001B TW I746001 B TWI746001 B TW I746001B TW 109119461 A TW109119461 A TW 109119461A TW 109119461 A TW109119461 A TW 109119461A TW I746001 B TWI746001 B TW I746001B
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speaker
signal
output signal
interference
received
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TW202147300A (en
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杜博仁
張嘉仁
曾凱盟
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宏碁股份有限公司
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A head-mounted apparatus and a stereo effect controlling method thereof are provided. In the method, an expect received signal for receiving the output of the first speaker is determined, a signal difference between the expect received signal and an actual received signal is determined, an interference of the output signal of the second speaker on the actual received signal is estimated according to the signal difference, and the output signal of the first speaker is generated according to the interference of the output signal of the second speaker. The expected received signal is related to the received signal on the first side which is received by merely receiving the output signal of the first speaker. The actual received signal is the received signal on the first side which is received by actually receiving the output signals of the first and second speakers. The signal difference is minimized. Accordingly, the impact of the head for the output signal may be considered, and the signal quality may be further improved.

Description

頭戴式裝置及其立體音效控制方法Head-mounted device and its stereo sound effect control method

本發明是有關於一種音訊處理技術，且特別是有關於一種頭戴式裝置及其立體音效控制方法。The invention relates to an audio processing technology, and more particularly to a head-mounted device and a stereo sound control method thereof.

市場上已經出現許多類型的頭戴式裝置(例如，數位眼鏡、頭戴式顯示器或虛擬實境(Virtual Reality，VR)頭戴套件等)。這些頭戴式裝置可能會配備左、右雙聲道的揚聲器。設於機體兩側的兩揚聲器各自播放一側聲道的聲音訊號。此雙聲道的聲音訊號原本會依據自由空間進行調整。例如，筆記型電腦或手機的揚聲器的訊號處理，或是兩個隔開耳機的訊號處理。一般而言，這些雙聲道的聲音訊號並沒有考慮人體及其頭部對聲音訊號造成的影響。然而，不同人的頭型和髮型不同。此外，頭部會造成部分的遮蔽效應，其中高頻訊號部分會被頭部阻隔，但低頻訊號部分可以穿越頭部，從而造成不同時間延遲，進而影響聲音品質。Many types of head-mounted devices (for example, digital glasses, head-mounted displays, or Virtual Reality (VR) headsets, etc.) have appeared on the market. These headsets may be equipped with left and right dual-channel speakers. Two speakers arranged on both sides of the body each play the sound signal of one channel. The audio signal of this two-channel will be adjusted according to the free space originally. For example, the signal processing of the speaker of a notebook computer or mobile phone, or the signal processing of two separate headphones. Generally speaking, these two-channel audio signals do not consider the impact of the human body and its head on the audio signals. However, different people have different head shapes and hairstyles. In addition, the head will cause a partial masking effect, in which the high-frequency signal part will be blocked by the head, but the low-frequency signal part can pass through the head, causing different time delays, thereby affecting the sound quality.

有鑑於此，本發明提供一種頭戴式裝置及其立體音效控制方法，預先去除另一側揚聲器的輸出對一側收音的干擾，進而提升訊號品質。In view of this, the present invention provides a head-mounted device and a stereo sound control method thereof, which removes interference from the output of the speaker on the other side to the reception of one side in advance, thereby improving the signal quality.

本發明實施例的立體音效控制方法適用於包括第一揚聲器及第二揚聲器的頭戴式裝置，第一揚聲器設於頭戴式裝置的第一側，第二揚聲器設於頭戴式裝置的第二側。立體音效控制方法包括(但不僅限於)下列步驟：決定對第一揚聲器收音所得的期望接收訊號，決定期望接收訊號與實際接收訊號之間的訊號差異，依據訊號差異估測第二揚聲器的輸出訊號對實際接收訊號的干擾，並依據第二揚聲器的輸出訊號的干擾產生該第一揚聲器的輸出訊號。期望接收訊號相關於僅對第一揚聲器在第一側收音所得的接收訊號。實際接收訊號是實際對第一揚聲器及第二揚聲器在第一側收音所得。對訊號差異最小化。The stereo sound control method of the embodiment of the present invention is applicable to a head-mounted device including a first speaker and a second speaker. The first speaker is provided on the first side of the head-mounted device, and the second speaker is provided on the first side of the head-mounted device. Two sides. The stereo sound control method includes (but is not limited to) the following steps: determine the expected received signal from the first speaker, determine the signal difference between the expected received signal and the actual received signal, and estimate the output signal of the second speaker based on the signal difference Interference to the actual received signal, and the output signal of the first speaker is generated according to the interference of the output signal of the second speaker. It is expected that the received signal is related to the received signal that is only received by the first speaker at the first side. The actual received signal is actually received from the first speaker and the second speaker on the first side. Minimize the signal difference.

本發明實施例的頭戴式裝置包括(但不僅限於)第一揚聲器、第二揚聲器、第一收音器、第二收音器及處理器。第一揚聲器設於頭戴式裝置的第一側，且第二揚聲器設於頭戴式裝置的第二側。第一收音器設於第一側，且第二收音器設於第二側。處理器耦接第一揚聲器、第二揚聲器、第一收音器及第二收音器。處理器載入並執行數個模組。這些模組包括差異決定模組、干擾估測模組及訊號合成模組。差異決定模組決定對第一揚聲器收音所得的期望接收訊號，並決定期望接收訊號與實際接收訊號之間的訊號差異。期望接收訊號相關於透過第一收音器僅對第一揚聲器在第一側收音所得的接收訊號，且實際接收訊號是實際透過第一收音器對第一揚聲器及第二揚聲器在第一側收音所得。干擾估測模組依據訊號差異估測第二揚聲器的輸出訊號對實際接收訊號的干擾，且對訊號差異最小化。訊號合成模組依據第二揚聲器的輸出訊號的干擾產生第一揚聲器的輸出訊號。The head-mounted device of the embodiment of the present invention includes (but is not limited to) a first speaker, a second speaker, a first microphone, a second microphone, and a processor. The first speaker is arranged on the first side of the head-mounted device, and the second speaker is arranged on the second side of the head-mounted device. The first microphone is arranged on the first side, and the second microphone is arranged on the second side. The processor is coupled to the first speaker, the second speaker, the first microphone, and the second microphone. The processor loads and executes several modules. These modules include difference determination module, interference estimation module and signal synthesis module. The difference determining module determines the expected received signal received from the first speaker, and determines the signal difference between the expected received signal and the actual received signal. The expected received signal is related to the received signal that is only received by the first speaker on the first side through the first microphone, and the actual received signal is actually received by the first speaker and the second speaker on the first side through the first microphone . The interference estimation module estimates the interference of the output signal of the second speaker to the actual received signal based on the signal difference, and minimizes the signal difference. The signal synthesis module generates the output signal of the first speaker according to the interference of the output signal of the second speaker.

基於上述，本發明實施例的頭戴式裝置及其立體音效控制方法，其對某一側的期望接收訊號及實際接收訊號之間的訊號差異最小化，以估測位於另一側的揚聲器的輸出對此側收音的干擾。接著，可依據此干擾調整此側揚聲器的輸出。藉此，可了解頭部對揚聲器的發聲所造成的影響，並能自適應地調整揚聲器的輸出，讓使用者體驗較為理想的聲音品質。Based on the above, the head-mounted device and the stereo sound control method of the embodiments of the present invention minimize the signal difference between the expected received signal on one side and the actual received signal to estimate the speaker on the other side. Output interference to the radio on this side. Then, the output of this side speaker can be adjusted according to the interference. In this way, the impact of the head on the sound of the speaker can be understood, and the output of the speaker can be adjusted adaptively, so that the user can experience a more ideal sound quality.

為讓本發明的上述特徵和優點能更明顯易懂，下文特舉實施例，並配合所附圖式作詳細說明如下。In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

圖1是依據本發明一實施例的頭戴式裝置100的方塊圖。請參照圖1，頭戴式裝置100可以是數位眼鏡(或稱智慧眼鏡)、頭戴式顯示器(Head-Mounted Display，HMD)或其他供人類頭部配戴的電子裝置。頭戴式裝置100包括但不僅限於揚聲器110, 120、儲存器130、收音器140, 145及處理器150。FIG. 1 is a block diagram of a head-mounted device 100 according to an embodiment of the invention. Please refer to FIG. 1, the head-mounted device 100 may be digital glasses (or smart glasses), a head-mounted display (HMD) or other electronic devices for human head wear. The head-mounted device 100 includes, but is not limited to, speakers 110, 120, a storage 130, a microphone 140, 145, and a processor 150.

揚聲器110, 120可以是喇叭或擴音器。在一實施例中，揚聲器110, 120分別設於頭戴式裝置100的第一側及第二側(例如，左、右兩側)，並分別對應到左、右兩聲道，以形成雙聲道揚聲器。The speakers 110, 120 may be speakers or loudspeakers. In one embodiment, the speakers 110, 120 are respectively provided on the first side and the second side (for example, the left and right sides) of the head-mounted device 100, and respectively correspond to the left and right channels to form a dual channel. Channel speakers.

儲存器130可以是任何型態的固定或可移動隨機存取記憶體(Radom Access Memory，RAM)、唯讀記憶體(Read Only Memory，ROM)、快閃記憶體(flash memory)、傳統硬碟(Hard Disk Drive，HDD)、固態硬碟(Solid-State Drive，SSD)或類似元件。在一實施例中，儲存器130用以記錄程式碼、軟體模組(例如，差異決定模組131、干擾估測模組133及訊號合成模組135等)、聲音訊號、訊號差異、權重、對聲音訊號的影響、誤差最小化函數及其他資料或檔案，其詳細內容待後續實施例詳述。The storage 130 can be any type of fixed or removable random access memory (Radom Access Memory, RAM), read-only memory (Read Only Memory, ROM), flash memory (flash memory), traditional hard disk (Hard Disk Drive, HDD), Solid-State Drive (SSD) or similar components. In one embodiment, the memory 130 is used to record program codes, software modules (for example, the difference determination module 131, the interference estimation module 133, and the signal synthesis module 135, etc.), sound signals, signal differences, weights, The details of the influence on the sound signal, the error minimization function, and other data or files will be detailed in the subsequent embodiments.

收音器140, 145可以是動圈式(dynamic)、電容式(Condenser)、或駐極體電容(Electret Condenser)等類型的麥克風，收音器140, 145也可以是其他可接收聲波(例如，人聲、環境聲、機器運作聲等)而轉換為聲音訊號的電子元件、類比至數位轉換器、濾波器、及音訊處理器之組合。在一實施例中，收音器140, 145分別設於頭戴式裝置100的第一側及第二側(例如，左、右兩側)，使得揚聲器110與收音器140設於同側，且揚聲器120與收音器145設於同側。The microphones 140 and 145 can be dynamic, condenser, or electret condenser microphones. The microphones 140 and 145 can also be other types of microphones that can receive sound waves (e.g., human voice). , Environmental sound, machine operation sound, etc.) and a combination of electronic components, analog-to-digital converters, filters, and audio processors that are converted into sound signals. In an embodiment, the microphones 140 and 145 are respectively arranged on the first side and the second side (for example, the left and right sides) of the head-mounted device 100, so that the speaker 110 and the microphone 140 are arranged on the same side, and The speaker 120 and the microphone 145 are arranged on the same side.

處理器150耦接揚聲器110, 120、儲存器130及收音器140, 145，處理器150並可以是中央處理單元(Central Processing Unit，CPU)，或是其他可程式化之一般用途或特殊用途的微處理器(Microprocessor)、數位信號處理器(Digital Signal Processor，DSP)、可程式化控制器、特殊應用積體電路(Application-Specific Integrated Circuit，ASIC)或其他類似元件或上述元件的組合。在一實施例中，處理器150用以執行頭戴式裝置100的所有或部份作業，且可載入並執行儲存器130所記錄的各軟體模組、檔案及資料。在一些實施例中，儲存器130所記錄的那些軟體模組也可能是實體電路所實現。The processor 150 is coupled to the speakers 110, 120, the storage 130, and the microphones 140, 145. The processor 150 may be a central processing unit (CPU) or other programmable general-purpose or special-purpose Microprocessor, Digital Signal Processor (DSP), programmable controller, Application-Specific Integrated Circuit (ASIC) or other similar components or a combination of the above components. In one embodiment, the processor 150 is used to perform all or part of the operations of the head-mounted device 100, and can load and execute various software modules, files, and data recorded in the storage 130. In some embodiments, the software modules recorded in the storage 130 may also be realized by physical circuits.

圖2是依據本發明一實施例的數位眼鏡200的示意圖。請參照圖2，數位眼鏡200的一側(例如，右側)設有揚聲器110與收音器140，且其另一側(例如，左側)設有揚聲器120與收音器145。使用者配戴頭戴式裝置100後，揚聲器110, 120及收音器140, 145鄰近於使用者的左、右耳。FIG. 2 is a schematic diagram of a digital glasses 200 according to an embodiment of the invention. Please refer to FIG. 2, one side (for example, the right side) of the digital glasses 200 is provided with a speaker 110 and a microphone 140, and the other side (for example, the left side) is provided with a speaker 120 and a microphone 145. After the user wears the head-mounted device 100, the speakers 110, 120 and the microphones 140, 145 are adjacent to the left and right ears of the user.

須說明的是，圖2的處理器150設於數位眼鏡200的主體。然而，在一些實施例中，處理器150可能不與揚聲器110, 120及收音器140, 145設於相同的裝置，且元件之間的訊號傳輸可經由有線或無線通訊(例如，Wi-Fi、藍芽、或USB等)達成。It should be noted that the processor 150 in FIG. 2 is provided in the main body of the digital glasses 200. However, in some embodiments, the processor 150 may not be provided in the same device as the speakers 110, 120 and the microphones 140, 145, and the signal transmission between the components may be through wired or wireless communication (for example, Wi-Fi, Bluetooth, or USB, etc.).

下文中，將搭配頭戴式裝置100中的各項裝置、元件及模組說明本發明實施例所述之方法。本方法的各個流程可依照實施情形而隨之調整，且並不僅限於此。另須說明的是，為了方便說明，下文將以揚聲器110與收音器140設於頭戴式裝置100的一側(下文稱第一側)且揚聲器120與收音器145設於頭戴式裝置100的另一側(下文稱第二側)為例。Hereinafter, various devices, components, and modules in the head-mounted device 100 will be used to describe the method according to the embodiment of the present invention. Each process of the method can be adjusted accordingly according to the implementation situation, and it is not limited to this. It should also be noted that, for the convenience of description, the speaker 110 and the microphone 140 are arranged on one side of the head-mounted device 100 (hereinafter referred to as the first side), and the speaker 120 and the microphone 145 are arranged on the head-mounted device 100. Take the other side (referred to as the second side hereinafter) as an example.

圖3是依據本發明一實施例的立體音效控制方法的流程圖。請參照圖3，差異決定模組131決定對揚聲器110收音所得的期望接收訊號(步驟S310)。具體而言，期望接收訊號相關於透過收音器140僅對揚聲器110在第一側(即，同側)收音所得的接收訊號。本發明實施例的收音器140, 145是用於估測使用者聽到揚聲器110, 120所發出的聲音。期望接收訊號代表期望使用者的某一耳朵僅聽到同側揚聲器的聲音。FIG. 3 is a flowchart of a stereo sound effect control method according to an embodiment of the invention. Referring to FIG. 3, the difference determining module 131 determines the expected received signal received by the speaker 110 (step S310). Specifically, the desired received signal is related to the received signal obtained by only receiving the speaker 110 on the first side (ie, the same side) through the microphone 140. The microphones 140 and 145 in the embodiment of the present invention are used to estimate the sound emitted by the speakers 110 and 120 by the user. The expected reception signal means that a certain ear of the user is expected to only hear the sound of the speaker on the same side.

無可避免地，揚聲器110的輸出訊號可能會經頻率響應增益及/或時間延遲等變化/影響因素而到達收音器140(對應到使用者的一耳)。於此，將對揚聲器110的輸出訊號透過收音器140在第一側收音所遭受的變化統稱為第一傳播介質(medium)(包括空氣、及/或人體等介質)的影響結果，且收音器140的期望接收訊號是揚聲器110的輸出訊號經過第一傳播介質所形成。相似地，揚聲器120的輸出訊號也可能會經頻率響應增益及/或時間延遲等變化/影響因素而到達收音器145(對應到使用者的另一耳)。於此，將對揚聲器120的輸出訊號透過收音器145在第二側(即，同側)收音所遭受的變化統稱為第二傳播介質的影響結果，且收音器145的期望接收訊號是揚聲器120的輸出訊號經過第二傳播介質所形成。Inevitably, the output signal of the speaker 110 may reach the microphone 140 (corresponding to one ear of the user) through changes/influencing factors such as frequency response gain and/or time delay. Herein, the change that the output signal of the loudspeaker 110 undergoes when the sound is picked up on the first side through the microphone 140 is collectively referred to as the result of the influence of the first medium (including air, and/or the human body and other media), and the microphone The expected reception signal of 140 is formed by the output signal of the speaker 110 passing through the first propagation medium. Similarly, the output signal of the speaker 120 may also reach the microphone 145 (corresponding to the other ear of the user) through changes/influencing factors such as frequency response gain and/or time delay. Herein, the change that the output signal to the loudspeaker 120 receives through the microphone 145 on the second side (ie, the same side) is collectively referred to as the effect of the second propagation medium, and the expected received signal of the microphone 145 is the loudspeaker 120. The output signal is formed by the second propagation medium.

以圖2為例，

Figure 02_image001
為揚聲器110對應於收音器140的第一傳播介質的頻率響應，
Figure 02_image003
為揚聲器120對應於收音器145的第二傳播介質的頻率響應。在本實施例中，
Figure 02_image001
、
Figure 02_image003
是以頻域上的響應來分別代表第一及第二傳播介質，且其值可事先設計，並可依據設計者的需求而變化。而收音器145的期望接收訊號
Figure 02_image005
的數學表示式如下：
Figure 02_image007
…(1)
Figure 02_image009
為揚聲器120的原始輸出訊號。收音器140的期望接收訊號可依此類推，於此不再贅述。 Take Figure 2 as an example,
Figure 02_image001
Is the frequency response of the speaker 110 corresponding to the first propagation medium of the microphone 140,
Figure 02_image003
It is the frequency response of the second propagation medium of the speaker 120 corresponding to the microphone 145. In this embodiment,
Figure 02_image001
,
Figure 02_image003
The first and second propagation media are represented by the response in the frequency domain, and the value can be designed in advance and can be changed according to the needs of the designer. And the expectation of the receiver 145 to receive the signal
Figure 02_image005
The mathematical expression of is as follows:
Figure 02_image007
…(1)
Figure 02_image009
Is the original output signal of the speaker 120. The expected reception signal of the microphone 140 can be deduced by analogy, and will not be repeated here.

差異決定模組131可透過收音器140對揚聲器110, 120在第一側收音所得的實際接收訊號，並透過收音器145對揚聲器110, 120在第二側收音所得的實際接收訊號。接著，差異決定模組131分別決定兩側的期望接收訊號與對應側的實際接收訊號之間的訊號差異(步驟S330)。具體而言，無可避免地，收音器140可能會接收到來自揚聲器120所發出的聲音，且收音器145也可能會接收到來自揚聲器110所發出的聲音。然而，另一側所發出的聲音都不是希望被聽到的聲音。由於期望接收訊號是僅有同側的輸出訊號被接收，因此期望接收訊號與對應側的實際接收訊號之間的訊號差異越小越符合期望。The difference determining module 131 can use the receiver 140 to receive the actual received signals from the speakers 110 and 120 on the first side, and use the receiver 145 to receive the actual received signals from the speakers 110 and 120 on the second side. Then, the difference determining module 131 determines the signal difference between the expected received signal on both sides and the actual received signal on the corresponding side (step S330). Specifically, it is inevitable that the microphone 140 may receive the sound emitted from the speaker 120, and the microphone 145 may also receive the sound emitted from the speaker 110. However, the sound from the other side is not what you want to hear. Since only the output signal of the same side of the expected received signal is received, the smaller the signal difference between the expected received signal and the actual received signal of the corresponding side, the more in line with the expectation.

相似地，揚聲器120的輸出訊號可能會經頻率響應增益及/或時間延遲等變化/影響因素而到達收音器140。於此，將對揚聲器120的輸出訊號透過收音器140在第一側收音所遭受的變化統稱為第三傳播介質的影響結果，且揚聲器120的輸出訊號經過此第三傳播介質將形成收音器140的干擾(即，不是希望被聽到的聲音)。此外，揚聲器110的輸出訊號也可能會經頻率響應增益及/或時間延遲等變化/影響因素而到達收音器145(對應到使用者的另一耳)。於此，將對揚聲器110的輸出訊號透過收音器145在第二側收音所遭受的變化統稱為第四傳播介質的影響結果，且揚聲器110的輸出訊號經過此第四傳播介質將形成收音器145的干擾。Similarly, the output signal of the loudspeaker 120 may reach the microphone 140 through changes/influencing factors such as frequency response gain and/or time delay. Herein, the change that the output signal of the speaker 120 receives through the microphone 140 on the first side is collectively referred to as the effect of the third propagation medium, and the output signal of the speaker 120 will form the microphone 140 through the third propagation medium. Disturbance (that is, a sound that is not expected to be heard). In addition, the output signal of the speaker 110 may also reach the microphone 145 (corresponding to the user's other ear) through changes/influencing factors such as frequency response gain and/or time delay. Herein, the change that the output signal of the speaker 110 undergoes through the microphone 145 to receive on the second side is collectively referred to as the effect of the fourth propagation medium, and the output signal of the speaker 110 will form the microphone 145 through the fourth propagation medium. Interference.

以圖2為例，

Figure 02_image011
為揚聲器120對應於收音器140的第三傳播介質的頻率響應，
Figure 02_image013
為揚聲器110對應於收音器145的第四傳播介質的頻率響應。在本實施例中，
Figure 02_image011
、
Figure 02_image013
是以頻域上的響應來分別代表第三及第四傳播介質。與第一及第二傳播介質不同之處在於，不同使用者的頭部可能形成不同的第三及第四傳播介質的頻率響應，因此第三及第四傳播介質的頻率響應初始視為未知。而第二側的訊號差異
Figure 02_image015
的數學表示式如下：
Figure 02_image017
…(2) Take Figure 2 as an example,
Figure 02_image011
Is the frequency response of the third propagation medium of the speaker 120 corresponding to the microphone 140,
Figure 02_image013
It is the frequency response of the fourth propagation medium of the speaker 110 corresponding to the microphone 145. In this embodiment,
Figure 02_image011
,
Figure 02_image013
The third and fourth propagation media are represented by the response in the frequency domain. The difference from the first and second propagation media is that the heads of different users may form different frequency responses of the third and fourth propagation media, so the frequency responses of the third and fourth propagation media are initially regarded as unknown. And the signal difference on the second side
Figure 02_image015
The mathematical expression of is as follows:
Figure 02_image017
…(2)

Figure 02_image019
為收音器145的實際接收訊號。第一側的訊號差異可依此類推，於此不再贅述。
Figure 02_image019
It is the actual reception signal of the microphone 145. The signal difference on the first side can be deduced by analogy, so I won't repeat it here.

干擾估測模組133可依據訊號差異估測揚聲器110的輸出訊號對第二側的實際接收訊號的干擾，並可依據另一訊號差異估測揚聲器120的輸出訊號對第一側的實際接收訊號的干擾(步驟S350)。具體而言，為了將訊號差異最小化，干擾估測模組133可先估測第三及第四傳播介質(如圖2的

Figure 02_image011
、
Figure 02_image013
)。在一實施例中，干擾估測模組133可採用權重更新演算法來近似第三及第四傳播介質，以對左側消除右聲道輸出的相關訊號或對右側消除左聲道輸出的相關訊號。 The interference estimation module 133 can estimate the interference of the output signal of the speaker 110 to the actual received signal of the second side based on the signal difference, and can estimate the output signal of the speaker 120 to the actual received signal of the first side based on another signal difference的interference (step S350). Specifically, in order to minimize the signal difference, the interference estimation module 133 may first estimate the third and fourth propagation media (as shown in FIG. 2
Figure 02_image011
,
Figure 02_image013
). In one embodiment, the interference estimation module 133 can use a weight update algorithm to approximate the third and fourth propagation media, so as to eliminate the relevant signal output by the right channel for the left side or eliminate the relevant signal output by the left channel for the right side. .

干擾估測模組133可依據揚聲器110, 120的輸出訊號及對應側的訊號誤差分別決定權重更新演算法中的權重，此權重分別相關於前述第三及第四傳播介質的頻率響應，且最終的權重對應到最小化的訊號誤差(即，權重更新演算法是用於最小化訊號誤差)。The interference estimation module 133 can determine the weights in the weight update algorithm according to the output signals of the speakers 110, 120 and the signal errors of the corresponding sides. The weights are respectively related to the frequency response of the third and fourth propagation media, and finally The weight of corresponds to the minimized signal error (that is, the weight update algorithm is used to minimize the signal error).

權重更新演算法有很多種。以最小均方(Least Mean Square，LMS)為例，其時域的表示為：

Figure 02_image021
…(3) ，其中
Figure 02_image023
代表了更新的間格大小(其值為常數，並代表更新步階大小，或稱步長)，
Figure 02_image023
影響了收斂(例如，訊號差異趨近於特定數值)的準確度和速度。此外，
Figure 02_image025
及
Figure 02_image027
分別代表不同取樣時間點對應的權重(例如， n+1是 n的下一個取樣時間點，並對應到頻域的權重
Figure 02_image029
)，且
Figure 02_image031
是揚聲器110的輸出訊號。方程式(3)代表第二側對應的權重更新演算法，而第一側對應的權重更新演算法可依此類推，於此不再贅述。 There are many kinds of weight update algorithms. Taking Least Mean Square (LMS) as an example, the time domain is expressed as:
Figure 02_image021
…(3) where
Figure 02_image023
Represents the size of the updated compartment (its value is a constant and represents the size of the update step, or step size),
Figure 02_image023
Affects the accuracy and speed of convergence (for example, the signal difference approaches a certain value). also,
Figure 02_image025
and
Figure 02_image027
Represents the weights corresponding to different sampling time points (for example, n +1 is the next sampling time point of n , and corresponds to the weight of the frequency domain
Figure 02_image029
),and
Figure 02_image031
Is the output signal of the speaker 110. Equation (3) represents the weight update algorithm corresponding to the second side, and the weight update algorithm corresponding to the first side can be deduced by analogy, and will not be repeated here.

圖4是依據本發明一實施例的訊號關係的示意圖。請參照圖4，第二側的訊號差異

Figure 02_image015
及揚聲器110的輸出訊號
Figure 02_image031
輸入到權重更新演算法LE L即可得出權重
Figure 02_image029
。相似地，第一側的訊號差異
Figure 02_image015
及揚聲器120的輸出訊號
Figure 02_image033
輸入到權重更新演算法LE R即可得出權重
Figure 02_image035
。 FIG. 4 is a schematic diagram of signal relationship according to an embodiment of the present invention. Please refer to Figure 4, the signal difference on the second side
Figure 02_image015
And the output signal of the speaker 110
Figure 02_image031
Enter the weight update algorithm LE L to get the weight
Figure 02_image029
. Similarly, the signal difference on the first side
Figure 02_image015
And the output signal of the speaker 120
Figure 02_image033
Enter the weight update algorithm LE R to get the weight
Figure 02_image035
.

透過不停更新對於欲消除訊的權重

Figure 02_image029
，且使用訊號差異
Figure 02_image015
輔助更新演算法，當訊號差異收斂時，會使得揚聲器110的輸出訊號經過此權重
Figure 02_image029
後會接近揚聲器110對應於收音器145的第四傳播介質的頻率響應：
Figure 02_image037
…(4) 相似地，第一側對應的權重更新演算法所估測的權重
Figure 02_image035
也可用於逼近揚聲器120對應於收音器140的第三傳播介質的頻率響應。揚聲器110的輸出訊號
Figure 02_image031
對第二側的實際接收訊號
Figure 02_image039
的干擾即是
Figure 02_image041
，且揚聲器120的輸出訊號
Figure 02_image033
對第一側的實際接收訊號
Figure 02_image043
的干擾即是
Figure 02_image045
。而第一及第二傳播介質的頻率響應(對應到
Figure 02_image001
、
Figure 02_image003
)及權重
Figure 02_image035
、
Figure 02_image029
此時皆已知，對應干擾也可據以得出。 By constantly updating the weight of the message to be eliminated
Figure 02_image029
, And use signal differences
Figure 02_image015
Auxiliary update algorithm, when the signal difference converges, the output signal of the speaker 110 will pass this weight
Figure 02_image029
Then it will approach the frequency response of the fourth propagation medium of the speaker 110 corresponding to the microphone 145:
Figure 02_image037
…(4) Similarly, the weight corresponding to the first side updates the weight estimated by the algorithm
Figure 02_image035
It can also be used to approximate the frequency response of the third propagation medium of the speaker 120 corresponding to the microphone 140. Speaker 110 output signal
Figure 02_image031
The actual received signal on the second side
Figure 02_image039
The interference is
Figure 02_image041
, And the output signal of the speaker 120
Figure 02_image033
The actual received signal on the first side
Figure 02_image043
The interference is
Figure 02_image045
. The frequency response of the first and second propagation media (corresponding to
Figure 02_image001
,
Figure 02_image003
) And weight
Figure 02_image035
,
Figure 02_image029
At this time, they are all known, and the corresponding interference can also be derived.

須說明的是，在其他實施例中，權重更新演算法也可能是基於訊號差異(作為誤差)的誤差最佳化(最小化)演算法。例如，最小均方(Least Square，LS)、或最小均方誤差估測演算法(Minimum Mean Square Error，MMSE)等演算法。It should be noted that in other embodiments, the weight update algorithm may also be an error optimization (minimization) algorithm based on the signal difference (as an error). For example, algorithms such as Least Square (LS) or Minimum Mean Square Error (MMSE).

請回到圖3，訊號合成模組135可依據揚聲器120的輸出訊號的干擾產生揚聲器110的輸出訊號，或依據揚聲器110的輸出訊號的干擾產生揚聲器120的輸出訊號(步驟S370)。具體而言，本發明實施例是預先對輸出訊號去除估測的干擾(基於訊號合成處理)，使最後實際接收訊號即便受到另一側輸出訊號的干擾也能接近或等同於期望接收訊號。Referring back to FIG. 3, the signal synthesis module 135 can generate the output signal of the speaker 110 according to the interference of the output signal of the speaker 120, or generate the output signal of the speaker 120 according to the interference of the output signal of the speaker 110 (step S370). Specifically, the embodiment of the present invention removes the estimated interference from the output signal in advance (based on signal synthesis processing), so that the final actual received signal can be close to or equal to the expected received signal even if it is interfered by the output signal from the other side.

在一實施例中，訊號合成模組135可依據兩權重及揚聲器110, 120的輸出訊號分別決定對應的預先消除訊號。請參照圖4，揚聲器110對應的預先消除訊號即是揚聲器120的輸出訊號與對應權重在頻域上的乘積(即，

Figure 02_image047
)，且揚聲器120對應的預先消除訊號即是揚聲器110的輸出訊號與對應權重在頻域上的乘積(即，
Figure 02_image049
)。 In one embodiment, the signal synthesis module 135 can determine the corresponding pre-cancellation signal according to the two weights and the output signals of the speakers 110 and 120, respectively. 4, the pre-cancellation signal corresponding to the speaker 110 is the product of the output signal of the speaker 120 and the corresponding weight in the frequency domain (ie,
Figure 02_image047
), and the pre-cancellation signal corresponding to the speaker 120 is the product of the output signal of the speaker 110 and the corresponding weight in the frequency domain (ie,
Figure 02_image049
).

訊號合成模組135可對揚聲器110, 120的輸出訊號分別移除對應的預先消除訊號，以產生揚聲器110, 120的最終輸出訊號。請參照圖4，揚聲器110, 120的最終輸出訊號

Figure 02_image031
、
Figure 02_image033
的數學表示式如下：
Figure 02_image051
…(5)
Figure 02_image053
…(6) 。即，訊號合成模組135依據揚聲器120在先前時間點的輸出訊號
Figure 02_image055
決定當前時間點的原始輸出訊號
Figure 02_image057
對應的預先消除訊號
Figure 02_image059
，從而得出當前時間的最終輸出訊號
Figure 02_image061
，其中先前時間早於當前時間點(例如是相差一個取樣點數)。另一方面，訊號合成模組135依據揚聲器110在先前時間點的輸出訊號
Figure 02_image063
決定當前時間點的原始輸出訊號
Figure 02_image065
對應的預先消除訊號
Figure 02_image067
，從而得出當前時間的最終輸出訊號
Figure 02_image069
。 The signal synthesis module 135 can remove the corresponding pre-cancelled signals from the output signals of the speakers 110 and 120 respectively to generate the final output signals of the speakers 110 and 120. Please refer to Figure 4, the final output signal of the speakers 110, 120
Figure 02_image031
,
Figure 02_image033
The mathematical expression of is as follows:
Figure 02_image051
…(5)
Figure 02_image053
…(6). That is, the signal synthesis module 135 is based on the output signal of the speaker 120 at the previous time point
Figure 02_image055
Determine the original output signal at the current point in time
Figure 02_image057
Corresponding pre-elimination signal
Figure 02_image059
To get the final output signal of the current time
Figure 02_image061
, Where the previous time is earlier than the current time point (for example, a difference of one sampling point). On the other hand, the signal synthesis module 135 is based on the output signal of the speaker 110 at the previous time point
Figure 02_image063
Determine the original output signal at the current time point
Figure 02_image065
Corresponding pre-elimination signal
Figure 02_image067
To get the final output signal of the current time
Figure 02_image069
.

此時，收音器140的實際接收訊號即是：

Figure 02_image071
Figure 02_image073
…(7) 而收音器145的實際接收訊號即是：
Figure 02_image075
…(8) 。藉此，實際接收訊號將趨近或等同於預設的期望接收訊號，從而消除另一側輸出的干擾。 At this time, the actual signal received by the microphone 140 is:
Figure 02_image071
Figure 02_image073
…(7) The actual signal received by the radio 145 is:
Figure 02_image075
…(8) . In this way, the actual received signal will be close to or equal to the preset expected received signal, thereby eliminating the interference output from the other side.

在實際應用上，此立體音效控制方法可在使用者的頭部戴上頭戴式裝置100後執行(例如，反應於使用者的觸發行為或額外感測器的偵測結果)，從而得出當前使用者頭部對揚聲器110, 120的輸出訊號所造成的影響，進而得出客製化的訊號調整。In practical applications, this stereo sound control method can be executed after the user wears the head-mounted device 100 on the head of the user (for example, in response to the user's triggering behavior or the detection result of an additional sensor), so as to obtain The impact of the current user's head on the output signal of the speakers 110, 120, and then a customized signal adjustment can be obtained.

綜上所述，在本發明實施例的頭戴式裝置及其立體音效控制方法中，基於將期望接收訊號及實際接收訊號之間的訊號差異視為誤差，並基於最小化誤差的目的來估測來自另一側輸出對應的權重。權重與另一側的輸出訊號即可用於估測來自另一側的干擾。此外，對所欲輸出的訊號提前去除干擾，使實際接收訊號能趨近或等於期望接收訊號。藉此，可排除頭部對頭戴式裝置的聲音輸出所造成的影響，並使頭戴式裝置自動調整而讓使用者獲得較為理想的聲音品質。In summary, in the head-mounted device and the stereo sound control method of the embodiment of the present invention, the difference between the expected received signal and the actual received signal is regarded as an error, and the error is estimated based on the purpose of minimizing the error. Measure the weight corresponding to the output from the other side. The weight and the output signal from the other side can be used to estimate the interference from the other side. In addition, the interference of the signal to be output is removed in advance, so that the actual received signal can be close to or equal to the expected received signal. Thereby, the influence of the head on the sound output of the head-mounted device can be eliminated, and the head-mounted device can be automatically adjusted to allow the user to obtain a more ideal sound quality.

雖然本發明已以實施例揭露如上，然其並非用以限定本發明，任何所屬技術領域中具有通常知識者，在不脫離本發明的精神和範圍內，當可作些許的更動與潤飾，故本發明的保護範圍當視後附的申請專利範圍所界定者為準。Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be subject to those defined by the attached patent application scope.

100:頭戴式裝置 110、120:揚聲器 130:儲存器 131:差異決定模組 133:干擾估測模組 135:訊號合成模組 140、145:收音器 150:處理器 200:數位眼鏡

Figure 02_image001
:第一傳播介質的頻率響應
Figure 02_image003
:第二傳播介質的頻率響應
Figure 02_image011
:第三傳播介質的頻率響應
Figure 02_image013
:第四傳播介質的頻率響應 S310~S370:步驟
Figure 02_image019
、
Figure 02_image077
:實際接收訊號
Figure 02_image009
、
Figure 02_image079
:原始輸出訊號
Figure 02_image005
:期望接收訊號
Figure 02_image035
、
Figure 02_image029
:權重 LE R、LE L:權重更新演算法
Figure 02_image031
、
Figure 02_image033
:輸出訊號 100: Head-mounted device 110, 120: Speaker 130: Storage 131: Difference determination module 133: Interference estimation module 135: Signal synthesis module 140, 145: Microphone 150: Processor 200: Digital glasses
Figure 02_image001
: Frequency response of the first propagation medium
Figure 02_image003
: Frequency response of the second propagation medium
Figure 02_image011
: Frequency response of the third propagation medium
Figure 02_image013
: Frequency response of the fourth propagation medium S310~S370: Steps
Figure 02_image019
,
Figure 02_image077
: Actual received signal
Figure 02_image009
,
Figure 02_image079
: Original output signal
Figure 02_image005
: Expect to receive signal
Figure 02_image035
,
Figure 02_image029
: Weight LE R , LE L : Weight update algorithm
Figure 02_image031
,
Figure 02_image033
: Output signal

圖1是依據本發明一實施例的頭戴式裝置的方塊圖。 圖2是依據本發明一實施例的頭戴式裝置的示意圖。 圖3是依據本發明一實施例的立體音效控制方法的流程圖。 圖4是依據本發明一實施例的訊號關係的示意圖。 FIG. 1 is a block diagram of a head-mounted device according to an embodiment of the invention. Fig. 2 is a schematic diagram of a head-mounted device according to an embodiment of the present invention. FIG. 3 is a flowchart of a stereo sound effect control method according to an embodiment of the invention. FIG. 4 is a schematic diagram of signal relationship according to an embodiment of the present invention.

S310~S370:步驟 S310~S370: steps

Claims (8)

一種立體音效控制方法，適用於包括一第一揚聲器及一第二揚聲器的一頭戴式裝置，該第一揚聲器設於該頭戴式裝置的一第一側，該第二揚聲器設於該頭戴式裝置的一第二側，且該立體音效控制方法包括：決定對該第一揚聲器收音所得的一期望接收訊號，其中該期望接收訊號相關於僅對該第一揚聲器在該第一側收音所得的接收訊號；決定該期望接收訊號與一實際接收訊號之間的一訊號差異，其中該實際接收訊號是實際對該第一揚聲器及該第二揚聲器在該第一側收音所得；依據該訊號差異估測該第二揚聲器的輸出訊號對該實際接收訊號的干擾，包括：依據該第二揚聲器的輸出訊號及該訊號差異決定一權重，其中該權重相關於對該第二揚聲器的輸出訊號在該第一側收音所經過的一第一傳播介質，該第二揚聲器的輸出訊號經過該第一傳播介質形成該干擾，且該權重對應到最小化的該訊號差異；以及依據該第二揚聲器的輸出訊號的干擾產生該第一揚聲器的輸出訊號。 A stereo sound control method is suitable for a head-mounted device including a first speaker and a second speaker, the first speaker is arranged on a first side of the head-mounted device, and the second speaker is arranged on the head A second side of the wearable device, and the stereo sound control method includes: determining a desired reception signal obtained by receiving the first speaker, wherein the desired reception signal is related to only the first speaker receiving sound on the first side The received signal obtained; determines a signal difference between the expected received signal and an actual received signal, where the actual received signal is actually obtained from the first speaker and the second speaker at the first side; based on the signal The difference estimation of the interference of the output signal of the second speaker on the actual received signal includes: determining a weight based on the output signal of the second speaker and the signal difference, wherein the weight is related to the output signal of the second speaker. A first propagation medium through which the first side radio is received, the output signal of the second speaker passes through the first propagation medium to form the interference, and the weight corresponds to the minimum signal difference; and according to the second speaker The interference of the output signal generates the output signal of the first speaker. 如請求項1所述的立體音效控制方法，其中該期望接收訊號是該第一揚聲器的輸出訊號經過一第二傳播介質所形成，該第二傳播介質相關於該第一揚聲器的輸出訊號在該第一側收音 所遭受的變化，且依據該第二揚聲器的輸出訊號的干擾產生該第一揚聲器的輸出訊號的步驟包括：依據該權重及該第二揚聲器的輸出訊號決定一預先消除訊號，其中依據該權重及該第二傳播介質的頻率響應決定該第一傳播介質的頻率響應；以及對該第一揚聲器的輸出訊號移除該預先消除訊號，以產生該第一揚聲器的最終輸出訊號，其中透過該第一揚聲器播放該最終輸出訊號。 The stereo sound control method according to claim 1, wherein the desired reception signal is formed by the output signal of the first speaker passing through a second propagation medium, and the second propagation medium is related to the output signal of the first speaker in the Radio on the first side The step of generating the output signal of the first speaker according to the interference of the output signal of the second speaker includes: determining a pre-cancellation signal based on the weight and the output signal of the second speaker, wherein The frequency response of the second propagation medium determines the frequency response of the first propagation medium; and the pre-cancelled signal is removed from the output signal of the first loudspeaker to generate the final output signal of the first loudspeaker. The speaker plays the final output signal. 如請求項2所述的立體音效控制方法，其中決定該預先消除訊號的步驟包括：依據該第二揚聲器在一先前時間點的輸出訊號決定一當前時間點的該預先消除訊號，其中該先前時間早於該當前時間點。 The stereo sound control method according to claim 2, wherein the step of determining the pre-cancellation signal includes: determining the pre-cancellation signal at a current time point according to the output signal of the second speaker at a previous time point, wherein the previous time Earlier than this current point in time. 如請求項1所述的立體音效控制方法，更包括：依據該第一揚聲器的輸出訊號的第二干擾產生該第二揚聲器的輸出訊號，其中該第二干擾相關於對該第二揚聲器在該第二側收音所期望的接收訊號與實際在該第二側收音所得的接收訊號之間的第二訊號差異，且產生該第二揚聲器的輸出訊號的步驟包括：依據該第一揚聲器的輸出訊號及該第二訊號差異決定一第二權重，其中該第二權重相關於對該第一揚聲器的輸出訊號在該第二側收音所經過的一第三傳播介質，該第一揚聲器的輸出訊號經過該第三傳播介質形成該第二干擾，且該第二權重對應到最小化的該第二訊號差異。 The stereo sound control method according to claim 1, further comprising: generating the output signal of the second speaker according to the second interference of the output signal of the first speaker, wherein the second interference is related to the second interference of the second speaker in the The second signal difference between the expected received signal received by the second side radio and the received signal actually received at the second side, and the step of generating the output signal of the second speaker includes: according to the output signal of the first speaker The difference between the second signal and the second signal determines a second weight, wherein the second weight is related to a third propagation medium through which the output signal of the first speaker is picked up on the second side, and the output signal of the first speaker passes through The third propagation medium forms the second interference, and the second weight corresponds to the minimized second signal difference. 一種頭戴式裝置，包括：一第一揚聲器，設於該頭戴式裝置的一第一側；一第二揚聲器，設於該頭戴式裝置的一第二側；一第一收音器，設於該第一側；一第二收音器，設於該第二側；以及一處理器，耦接該第一揚聲器、該第二揚聲器、該第一收音器及該第二收音器，載入並執行多個模組，該些模組包括：一差異決定模組，決定對該第一揚聲器收音所得的一期望接收訊號，並決定該期望接收訊號與一實際接收訊號之間的一訊號差異，其中該期望接收訊號相關於透過該第一收音器僅對該第一揚聲器在該第一側收音所得的接收訊號，且該實際接收訊號是實際透過該第一收音器對該第一揚聲器及該第二揚聲器在該第一側收音所得；一干擾估測模組，依據該訊號差異估測該第二揚聲器的輸出訊號對該實際接收訊號的干擾，其中該干擾估測模組依據該第二揚聲器的輸出訊號及該訊號差異決定一權重，其中該權重相關於透過該第一收音器對該第二揚聲器的輸出訊號在該第一側收音所經過的一第一傳播介質，該第二揚聲器的輸出訊號經過該第一傳播介質形成該干擾，且該權重對應到最小化的該訊號差異；以及一訊號合成模組，依據該第二揚聲器的輸出訊號的干擾產生該第一揚聲器的輸出訊號。 A head-mounted device includes: a first speaker arranged on a first side of the head-mounted device; a second speaker arranged on a second side of the head-mounted device; and a first microphone, Located on the first side; a second microphone located on the second side; and a processor coupled to the first speaker, the second speaker, the first microphone and the second microphone, carrying A number of modules are incorporated and executed, and the modules include: a difference determination module, which determines an expected reception signal received from the first speaker, and determines a signal between the expected reception signal and an actual reception signal The difference, where the expected received signal is related to the received signal that is only received by the first speaker at the first side through the first radio, and the actual received signal is actually received through the first radio to the first speaker And the second speaker receiving the sound on the first side; an interference estimation module that estimates the interference of the output signal of the second speaker on the actual received signal based on the signal difference, wherein the interference estimation module is based on the The output signal of the second speaker and the signal difference determine a weight, wherein the weight is related to a first propagation medium through which the output signal of the second speaker is picked up on the first side through the first microphone, and the second The output signals of the two speakers form the interference through the first propagation medium, and the weight corresponds to the minimum signal difference; and a signal synthesis module generates the interference of the first speaker according to the interference of the output signal of the second speaker Output signal. 如請求項5所述的頭戴式裝置，其中該期望接收訊號是該第一揚聲器的輸出訊號經過一第二傳播介質所形成，該第二傳播介質相關於該第一揚聲器的輸出訊號透過該第一收音器在該第一側收音所遭受的變化，且該訊號合成模組依據該權重及該第二揚聲器的輸出訊號決定一預先消除訊號，並對該第一揚聲器的輸出訊號移除該預先消除訊號，以產生該第一揚聲器的最終輸出訊號，其中該干擾估測模組依據該權重及該第二傳播介質的頻率響應決定該第一傳播介質的頻率響應，且該訊號合成模組透過該第一揚聲器播放該最終輸出訊號。 The head-mounted device according to claim 5, wherein the desired reception signal is formed by the output signal of the first speaker passing through a second propagation medium, and the second propagation medium is related to the output signal of the first speaker passing through the The change suffered by the first radio on the first side, and the signal synthesis module determines a pre-cancellation signal based on the weight and the output signal of the second speaker, and removes the output signal from the first speaker The signal is eliminated in advance to generate the final output signal of the first speaker, wherein the interference estimation module determines the frequency response of the first propagation medium according to the weight and the frequency response of the second propagation medium, and the signal synthesis module The final output signal is played through the first speaker. 如請求項6所述的頭戴式裝置，其中該訊號合成模組依據該第二揚聲器在一先前時間點的輸出訊號決定一當前時間點的該預先消除訊號，其中該先前時間早於該當前時間點。 The head-mounted device according to claim 6, wherein the signal synthesis module determines the pre-cancellation signal at a current time according to the output signal of the second speaker at a previous time, wherein the previous time is earlier than the current Point in time. 如請求項5所述的頭戴式裝置，其中該訊號合成模組依據該第一揚聲器的輸出訊號的第二干擾產生該第二揚聲器的輸出訊號，其中該第二干擾相關於透過該第二收音器對該第二揚聲器在該第二側收音所期望的接收訊號與實際透過該第二收音器在該第二側收音所得的接收訊號之間的第二訊號差異，該干擾估測模組依據該第一揚聲器的輸出訊號及該第二訊號差異決定一第二權重，其中該第二權重相關於對該第一揚聲器的輸出訊號在該第二側收音所經過的一第三傳播介質，該第一揚聲器的輸出訊號經過該第三傳播介質形成該第二干擾，且該第二權重對應到最小化的該第二訊號差異。 The head-mounted device according to claim 5, wherein the signal synthesis module generates the output signal of the second speaker according to the second interference of the output signal of the first speaker, wherein the second interference is related to passing through the second The second signal difference between the expected received signal received by the second speaker on the second side by the microphone and the received signal actually received by the second speaker on the second side, the interference estimation module A second weight is determined according to the difference between the output signal of the first speaker and the second signal, wherein the second weight is related to a third propagation medium through which the output signal of the first speaker is picked up on the second side, The output signal of the first speaker passes through the third propagation medium to form the second interference, and the second weight corresponds to the minimized difference of the second signal.
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