TW202228434A - Method of reducing common mode interference and image acquisition device and information processing device using the same applying a common mode noise monitor module to detect common mode noise - Google Patents

Method of reducing common mode interference and image acquisition device and information processing device using the same applying a common mode noise monitor module to detect common mode noise Download PDF

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TW202228434A
TW202228434A TW110101132A TW110101132A TW202228434A TW 202228434 A TW202228434 A TW 202228434A TW 110101132 A TW110101132 A TW 110101132A TW 110101132 A TW110101132 A TW 110101132A TW 202228434 A TW202228434 A TW 202228434A
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gain
mode noise
common mode
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TWI773085B (en
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陳飛祥
李偉江
李卓
楊俊
胡丹丹
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大陸商北京集創北方科技股份有限公司
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Abstract

Disclose is a method of reducing common mode interference, which includes: applying a common mode noise monitor module to detect common mode noise, and reducing gains in a gain-adjustable dummy front end amplifier and each amplifier in the array of a gain-adjustable front end amplifier when the common mode noise is detected; and running a deduction operation on the output signals produced by each amplifier in the array of the gain-adjustable front end amplifier and the gain-adjustable dummy front end amplifier, thereby removing the common mode noise.

Description

降低共模干擾的方法及利用其之圖像採集裝置和資訊處理裝置Method for reducing common mode interference and image acquisition device and information processing device using the same

本發明係有關圖像採集技術，尤指一種可降低共模干擾的圖像採集技術。The invention relates to an image acquisition technology, in particular to an image acquisition technology that can reduce common mode interference.

一般的圖像識別晶片(例如，指紋識別晶片)在進行圖像採集程序時係先利用類比前端（AFE）進行類比信號採樣操作，以採集圖像感測元件所產生的電荷、電流或電壓信號，然後再將採集到的類比信號轉成數位信號以供後續的識別操作。A general image recognition chip (for example, a fingerprint recognition chip) first uses an analog front end (AFE) to perform an analog signal sampling operation during the image acquisition process, so as to collect the charge, current or voltage signal generated by the image sensing element , and then convert the collected analog signal into a digital signal for subsequent identification operations.

然而，在現實環境裡，由電源波動或充電器干擾所產生的共模雜訊卻會對類比前端造成干擾，導致輸出信號畸變，甚至無法識別。例如，指紋識別晶片在充電器干擾較大時經常會出現無法識別的情況。However, in a real environment, common-mode noise generated by power supply fluctuations or charger interference will interfere with the analog front end, resulting in distortion of the output signal, or even unrecognizable. For example, the fingerprint recognition chip often fails to recognize when the charger interferes with it.

為了解決電源波動或充電器干擾對輸出信號所造成的扭曲問題，一般的做法係在軟體端進行影像處理，或者通過數位調頻技術減小共模干擾的影響。然而，這些方法都是以類比前端還能正常工作為前提，若共模雜訊太大導致類比前端飽和，則該些方法都會無效。In order to solve the problem of distortion of the output signal caused by power fluctuations or charger interference, the general practice is to perform image processing on the software side, or to reduce the influence of common mode interference through digital frequency modulation technology. However, these methods are all based on the premise that the analog front end can still work normally. If the common mode noise is too large and the analog front end is saturated, these methods will be invalid.

為解決上述的問題，本領域亟需一種新穎的降低共模干擾的方法。To solve the above problems, a novel method for reducing common mode interference is urgently needed in the art.

本發明之一目的在於提供一種降低共模干擾的方法，其可在偵測到共模雜訊時藉由調降一增益可調的虛設的前端放大器及一增益可調前端放大器陣列的增益確保感測值信號不會飽和，從而可有效地藉由一減法運算有效去除一採集到之圖像中的共模雜訊。One object of the present invention is to provide a method for reducing common-mode interference, which can ensure that the gain of a dummy front-end amplifier with adjustable gain and a gain-adjustable front-end amplifier array is reduced when common-mode noise is detected. The sensed value signal is not saturated, so that the common mode noise in a captured image can be effectively removed by a subtraction operation.

本發明之另一目的在於提供一種圖像採集裝置，其可在偵測到共模雜訊時藉由調降一增益可調的虛設的前端放大器及一增益可調前端放大器陣列的增益確保感測值信號不會飽和，從而可有效地藉由一減法運算有效去除一採集到之圖像中的共模雜訊。Another object of the present invention is to provide an image acquisition device, which can ensure a sense of sensitivity by reducing the gain of a dummy front-end amplifier with adjustable gain and a front-end amplifier array with adjustable gain when common mode noise is detected. The measured value signal is not saturated, so that the common mode noise in a captured image can be effectively removed by a subtraction operation.

本發明之又一目的在於提供一種資訊處理裝置，其具有前述之圖像採集裝置而可確保採集到之圖像的品質，從而提高圖像的辨識率。Another object of the present invention is to provide an information processing device, which has the aforementioned image capturing device to ensure the quality of the captured image, thereby improving the image recognition rate.

為達到前述之目的，一種降低共模干擾的方法乃被提出，其包括：In order to achieve the aforementioned purpose, a method for reducing common mode interference is proposed, which includes:

利用一共模雜訊監測模組偵測一共模雜訊，並在偵測到所述共模雜訊時降低一增益可調的虛設的前端放大器及一增益可調前端放大器陣列中各個放大器的增益；以及A common-mode noise monitoring module is used to detect a common-mode noise, and when the common-mode noise is detected, a gain-adjustable dummy front-end amplifier and the gain of each amplifier in the gain-adjustable front-end amplifier array are reduced ;as well as

將該增益可調前端放大器陣列中各所述放大器的輸出信號與該增益可調的虛設的前端放大器的輸出信號各進行一減法運算以去除所述共模雜訊。The output signal of each amplifier in the gain-adjustable front-end amplifier array and the output signal of the gain-adjustable dummy front-end amplifier are each subjected to a subtraction operation to remove the common mode noise.

在一實施例中，該共模雜訊監測模組的偵測方式包括： 直接監測包含一圖像採集裝置之一資訊處理裝置之一充電狀態，若該充電狀態為作用狀態，則認定該圖像採集裝置存在所述共模雜訊。 In one embodiment, the detection method of the common mode noise monitoring module includes: A charging state of an information processing device including an image capturing device is directly monitored, and if the charging state is an active state, it is determined that the image capturing device has the common mode noise.

在一實施例中，該共模雜訊監測模組的偵測方式包括：In one embodiment, the detection method of the common mode noise monitoring module includes:

將該增益可調的虛設的前端放大器的輸出信號的準位與一閾值比較，若該準位高於該閾值，則認定一圖像採集裝置存在所述共模雜訊。The level of the output signal of the dummy front-end amplifier with adjustable gain is compared with a threshold, and if the level is higher than the threshold, it is determined that an image acquisition device has the common mode noise.

為達到前述之目的，本發明進一步提出一種圖像採集裝置，其具有一共模雜訊監測模組、一增益可調的虛設的前端放大器及一增益可調前端放大器陣列以執行一降低共模干擾的方法，其中，該增益可調前端放大器陣列係用以感測一感測元件陣列，且該方法包括：In order to achieve the aforementioned object, the present invention further provides an image acquisition device, which has a common-mode noise monitoring module, a gain-adjustable dummy front-end amplifier, and an adjustable-gain front-end amplifier array to perform a common mode interference reduction The method of , wherein the gain adjustable front-end amplifier array is used to sense a sensing element array, and the method includes:

利用該共模雜訊監測模組偵測一共模雜訊，並在偵測到所述共模雜訊時降低該增益可調的虛設的前端放大器及該增益可調前端放大器陣列中各個放大器的增益；以及The common-mode noise monitoring module is used to detect a common-mode noise, and when the common-mode noise is detected, the gain-adjustable dummy front-end amplifier and the respective amplifiers in the gain-adjustable front-end amplifier array are reduced. gain; and

將該增益可調前端放大器陣列中各所述放大器的輸出信號與該增益可調的虛設的前端放大器的輸出信號各進行一減法運算以去除所述共模雜訊。The output signal of each amplifier in the gain-adjustable front-end amplifier array and the output signal of the gain-adjustable dummy front-end amplifier are each subjected to a subtraction operation to remove the common mode noise.

在一實施例中， 該共模雜訊監測模組的偵測方式包括：In one embodiment, the detection method of the common mode noise monitoring module includes:

直接監測包含該圖像採集裝置之一資訊處理裝置之一充電狀態，若該充電狀態為作用狀態，則認定該圖像採集裝置存在所述共模雜訊。A charging state of an information processing device including the image capturing device is directly monitored, and if the charging state is an active state, it is determined that the image capturing device has the common mode noise.

在一實施例中，該共模雜訊監測模組的偵測方式包括：In one embodiment, the detection method of the common mode noise monitoring module includes:

將該增益可調的虛設的前端放大器的輸出信號的準位與一閾值比較，若該準位高於該閾值，則認定該圖像採集裝置存在所述共模雜訊。The level of the output signal of the dummy front-end amplifier with adjustable gain is compared with a threshold, and if the level is higher than the threshold, it is determined that the image acquisition device has the common mode noise.

為達到前述之目的，本發明進一步提出一種資訊處理裝置，其具有一中央處理單元及一圖像採集裝置，其中，該中央處理單元係用以與該圖像採集裝置通信，且該圖像採集裝置具有一共模雜訊監測模組、一增益可調的虛設的前端放大器及一增益可調前端放大器陣列以執行一降低共模干擾的方法，其中，該增益可調前端放大器陣列係用以感測一感測元件陣列，且該方法包括：In order to achieve the aforementioned object, the present invention further provides an information processing device, which has a central processing unit and an image capture device, wherein the central processing unit is used for communicating with the image capture device, and the image capture device The device has a common-mode noise monitoring module, a gain-adjustable dummy front-end amplifier, and an adjustable-gain front-end amplifier array to implement a method for reducing common-mode interference, wherein the adjustable-gain front-end amplifier array is used for sensing Sensing an array of sensing elements, and the method includes:

利用該共模雜訊監測模組偵測一共模雜訊，並在偵測到所述共模雜訊時降低該增益可調的虛設的前端放大器及該增益可調前端放大器陣列中各個放大器的增益；以及The common-mode noise monitoring module is used to detect a common-mode noise, and when the common-mode noise is detected, the gain-adjustable dummy front-end amplifier and the respective amplifiers in the gain-adjustable front-end amplifier array are reduced. gain; and

將該增益可調前端放大器陣列中各所述放大器的輸出信號與該增益可調的虛設的前端放大器的輸出信號各進行一減法運算以去除所述共模雜訊。The output signal of each amplifier in the gain-adjustable front-end amplifier array and the output signal of the gain-adjustable dummy front-end amplifier are each subjected to a subtraction operation to remove the common mode noise.

在一實施例中，該共模雜訊監測模組的偵測方式包括：In one embodiment, the detection method of the common mode noise monitoring module includes:

直接監測該資訊處理裝置之一充電狀態，若該充電狀態為作用狀態，則認定該圖像採集裝置存在所述共模雜訊。A charging state of the information processing device is directly monitored, and if the charging state is an active state, it is determined that the image acquisition device has the common mode noise.

在一實施例中，該共模雜訊監測模組的偵測方式包括：In one embodiment, the detection method of the common mode noise monitoring module includes:

將該增益可調的虛設的前端放大器的輸出信號的準位與一閾值比較，若該準位高於該閾值，則認定該圖像採集裝置存在所述共模雜訊。The level of the output signal of the dummy front-end amplifier with adjustable gain is compared with a threshold, and if the level is higher than the threshold, it is determined that the image acquisition device has the common mode noise.

在可能的實施例中，該資訊處理裝置可為一攜帶型電腦或一智慧型手持裝置。In a possible embodiment, the information processing device may be a portable computer or a smart handheld device.

本發明之原理在於：The principle of the present invention is:

(一)在一共模雜訊監測模組偵測到一圖像採集裝置存在共模雜訊時，降低一虛設的(dummy)前端放大器及一前端放大器陣列中各個放大器的增益，以確保各所述放大器的輸出信號不致飽和；(1) When a common-mode noise monitoring module detects the presence of common-mode noise in an image acquisition device, reduce the gain of a dummy front-end amplifier and each amplifier in a front-end amplifier array to ensure that each The output signal of the amplifier will not be saturated;

(二)該共模雜訊監測模組的判斷方式可為：(1)直接監測包含該圖像採集裝置之一資訊處理裝置之一充電狀態，若該訊處理裝置正在充電，則可認定該圖像採集裝置存在所述共模雜訊；或(2)將該虛設的前端放大器的輸出信號的準位與一閾值比較，若該準位高於該閾值，則認定該圖像採集裝置存在所述共模雜訊；以及(2) The judgment method of the common mode noise monitoring module can be as follows: (1) Directly monitor the charging state of an information processing device including an information processing device of the image acquisition device, if the information processing device is being charged, it can be determined that the The image acquisition device has the common mode noise; or (2) the level of the output signal of the dummy front-end amplifier is compared with a threshold, and if the level is higher than the threshold, it is determined that the image acquisition device exists the common mode noise; and

(三)藉由將該前端放大器陣列中各所述放大器的輸出信號與該虛設的前端放大器的輸出信號各進行一減法運算以去除所述共模雜訊。(3) The common mode noise is removed by performing a subtraction operation on the output signal of each of the amplifiers in the front-end amplifier array and the output signal of the dummy front-end amplifier.

請參照圖1，其繪示本發明之可降低共模干擾之圖像採集裝置之一實施例的方塊圖。如圖1所示，一圖像採集裝置100具有一共模雜訊監測模組110、一控制單元120、一增益可調的虛設的前端放大器130、一增益可調前端放大器陣列140及一感測元件陣列150。Please refer to FIG. 1 , which is a block diagram of an embodiment of an image capturing apparatus capable of reducing common mode interference of the present invention. As shown in FIG. 1 , an image acquisition device 100 includes a common mode noise monitoring module 110 , a control unit 120 , a dummy front-end amplifier 130 with adjustable gain, a front-end amplifier array 140 with adjustable gain, and a sensing Element array 150 .

共模雜訊監測模組110係用以偵測圖像採集裝置100是否存在共模雜訊並據以輸出一指示信號N COM，若存在共模雜訊，則使指示信號N COM呈現作用狀態。 The common mode noise monitoring module 110 is used to detect whether the image acquisition device 100 has common mode noise and output an indication signal N COM accordingly. If there is common mode noise, the indication signal N COM is in an active state. .

控制單元120係用以在指示信號N COM呈現作用狀態時輸出一增益調整信號C GAIN以降低增益可調前端放大器陣列140及增益可調的虛設的前端放大器130的增益，從而避免增益可調前端放大器陣列140及增益可調的虛設的前端放大器130發生飽和。 The control unit 120 is used for outputting a gain adjustment signal C GAIN when the indication signal N COM exhibits an active state to reduce the gain of the gain adjustable front end amplifier array 140 and the gain adjustable dummy front end amplifier 130 , so as to avoid the gain adjustable front end The amplifier array 140 and the dummy front-end amplifier 130 with adjustable gain are saturated.

增益可調的虛設的前端放大器130具有一控制端、一輸入端及一輸出端，該控制端係與增益調整信號C GAIN耦接以調整增益可調的虛設的前端放大器130之增益，該輸入端係與一直流電壓V P耦接，且該輸出端係用以提供一共模雜訊輸出信號V NCOM，其中，該直流電壓V P可為一接地電壓或一直流工作電壓，當共模雜訊發生時，該共模雜訊會流竄至該接地電壓或該直流工作電壓。 The gain-adjustable dummy front-end amplifier 130 has a control terminal, an input terminal and an output terminal. The control terminal is coupled to the gain adjustment signal C GAIN to adjust the gain of the gain-adjustable dummy front-end amplifier 130 . The terminal is coupled to the DC voltage VP, and the output terminal is used to provide a common mode noise output signal V NCOM , wherein the DC voltage VP can be a ground voltage or a DC working voltage. When the signal occurs, the common mode noise will flow to the ground voltage or the DC working voltage.

增益可調前端放大器陣列140具有有一控制端、N個輸入端及N個輸出端，該控制端係與增益調整信號C GAIN耦接以調整增益可調前端放大器陣列140中各放大器的增益，所述N個輸入端係與感測元件陣列150之N個感測元件的輸出信號S 1-S N耦接，且所述N個輸出端係用以輸出N個感測值信號V A1-V AN。 The gain-adjustable front-end amplifier array 140 has a control terminal, N input terminals and N output terminals. The control terminal is coupled to the gain adjustment signal C GAIN to adjust the gain of each amplifier in the gain-adjustable front-end amplifier array 140 . The N input terminals are coupled to the output signals S 1 -S N of the N sensing elements of the sensing element array 150 , and the N output terminals are used for outputting N sensing value signals V A1 -V AN .

感測元件陣列150可為電容式或光學式的感測元件陣列，用以感測一使用者之一生物特徵。The sensing element array 150 can be a capacitive or optical sensing element array for sensing a biometric characteristic of a user.

於操作時，當共模雜訊監測模組110偵測到共模雜訊時，其會使指示信號N COM呈現作用狀態以使控制單元120輸出增益調整信號C GAIN，以降低增益可調前端放大器陣列140及增益可調的虛設的前端放大器130的增益，從而確保增益可調前端放大器陣列140及增益可調的虛設的前端放大器130不會發生飽和現象。另外，藉由將N個感測值信號V A1-V AN與共模雜訊輸出信號V NCOM各進行一減法運算即可有效去除所述共模雜訊。 During operation, when the common mode noise monitoring module 110 detects common mode noise, it will make the indicator signal N COM present an active state so that the control unit 120 outputs the gain adjustment signal C GAIN to reduce the gain adjustable front end The gain of the amplifier array 140 and the gain-adjustable dummy front-end amplifier 130 ensures that the gain-adjustable front-end amplifier array 140 and the gain-adjustable dummy front-end amplifier 130 will not be saturated. In addition, the common mode noise can be effectively removed by performing a subtraction operation on each of the N sensing value signals V A1 -V AN and the common mode noise output signal V NCOM .

另外，請一併參照圖2a及2b，其繪示圖1中之共模雜訊監測模組110之兩個實施例的方塊圖。如圖2a所示，共模雜訊監測模組110包含一充電狀態偵測單元111，用以直接監測包含該圖像採集裝置100之一資訊處理裝置之一充電狀態信號S CHG，其中，若充電狀態信號S CHG呈現作用狀態，則使指示信號N COM呈現作用狀態；以及如圖2b所示，共模雜訊監測模組110包含一比較單元112，用以將增益可調的虛設的前端放大器130的輸出信號V NCOM的準位與一閾值電壓V THR比較，若該準位高於閾值電壓V THR，則使指示信號N COM呈現作用狀態。 In addition, please refer to FIGS. 2 a and 2 b together, which are block diagrams of two embodiments of the common mode noise monitoring module 110 in FIG. 1 . As shown in FIG. 2a , the common mode noise monitoring module 110 includes a charge state detection unit 111 for directly monitoring a charge state signal S CHG of an information processing device including the image capture device 100 . When the charging state signal S CHG is in an active state, the indicator signal N COM is in an active state; and as shown in FIG. 2b , the common mode noise monitoring module 110 includes a comparison unit 112 for adjusting the gain of a dummy front end The level of the output signal V NCOM of the amplifier 130 is compared with a threshold voltage V THR , and if the level is higher than the threshold voltage V THR , the indicator signal N COM is in an active state.

依上述的說明，本發明提出一種降低共模干擾的方法。請參照圖3，其繪示本發明之降低共模干擾的方法之一實施例之流程圖。如圖3所示，該方法包含：利用一共模雜訊監測模組偵測一共模雜訊，並在偵測到所述共模雜訊時降低一增益可調的虛設的前端放大器及一增益可調前端放大器陣列中各個放大器的增益(步驟a)；以及將該增益可調前端放大器陣列中各所述放大器的輸出信號與該增益可調的虛設的前端放大器的輸出信號各進行一減法運算以去除所述共模雜訊(步驟b)。According to the above description, the present invention provides a method for reducing common mode interference. Please refer to FIG. 3 , which shows a flowchart of an embodiment of a method for reducing common mode interference of the present invention. As shown in FIG. 3 , the method includes: using a common mode noise monitoring module to detect a common mode noise, and reducing a dummy front-end amplifier with adjustable gain and a gain when the common mode noise is detected Adjusting the gain of each amplifier in the front-end amplifier array (step a); and performing a subtraction operation on the output signal of each amplifier in the gain-adjustable front-end amplifier array and the output signal of the gain-adjustable dummy front-end amplifier to remove the common mode noise (step b).

在步驟a中，該共模雜訊監測模組的偵測方式可為：(1)直接監測包含該圖像採集裝置之一資訊處理裝置之一充電狀態，若該充電狀態為作用狀態，則認定該圖像採集裝置存在所述共模雜訊；或(2)將該增益可調的虛設的前端放大器的輸出信號的準位與一閾值比較，若該準位高於該閾值，則認定該圖像採集裝置存在所述共模雜訊。In step a, the detection method of the common mode noise monitoring module may be: (1) Directly monitor a charging state of an information processing device including an information processing device of the image acquisition device, if the charging state is an active state, then It is determined that the image acquisition device has the common mode noise; or (2) the level of the output signal of the dummy front-end amplifier with adjustable gain is compared with a threshold, and if the level is higher than the threshold, it is determined The image acquisition device has the common mode noise.

依上述的說明，本發明進一步提出一資訊處理裝置。請參照圖4，其繪示本發明之資訊處理裝置之一實施例的方塊圖。如圖4所示，一資訊處理裝置200具有一中央處理單元210及一圖像採集裝置220，其中，中央處理單元210係用以與圖像採集裝置220通信且圖像採集裝置220係由圖像採集裝置100實現。另外，資訊處理裝置200可為一攜帶型電腦或一智慧型手持裝置。According to the above description, the present invention further provides an information processing device. Please refer to FIG. 4 , which shows a block diagram of an embodiment of the information processing apparatus of the present invention. As shown in FIG. 4 , an information processing device 200 has a central processing unit 210 and an image capturing device 220 , wherein the central processing unit 210 is used for communicating with the image capturing device 220 and the image capturing device 220 is shown in FIG. The image acquisition device 100 is implemented. In addition, the information processing device 200 can be a portable computer or a smart handheld device.

依上述的說明可知，本發明可提供以下的優點：According to the above description, the present invention can provide the following advantages:

1.本發明的降低共模干擾的方法可在偵測到共模雜訊時藉由調降一增益可調的虛設的前端放大器及一增益可調前端放大器陣列的增益確保感測值信號不會飽和，從而可有效地藉由一減法運算有效去除一採集到之圖像中的共模雜訊。1. The method for reducing common mode interference of the present invention can ensure that the sensed value signal is not detected by reducing the gain of a dummy front-end amplifier with adjustable gain and a gain-adjustable front-end amplifier array when common mode noise is detected. will saturate, thereby effectively removing common mode noise from a captured image by a subtraction operation.

2.本發明的圖像採集裝置可在偵測到共模雜訊時藉由調降一增益可調的虛設的前端放大器及一增益可調前端放大器陣列的增益確保感測值信號不會飽和，從而可有效地藉由一減法運算有效去除一採集到之圖像中的共模雜訊。2. The image acquisition device of the present invention can ensure that the sensed value signal will not be saturated by reducing the gain of a dummy front-end amplifier with adjustable gain and a front-end amplifier array with adjustable gain when common mode noise is detected , so that the common mode noise in a captured image can be effectively removed by a subtraction operation.

3.本發明的資訊處理裝置因具有前述之圖像採集裝置而可確保採集到之圖像的品質，從而提高圖像的辨識率。3. The information processing device of the present invention can ensure the quality of the captured image due to the aforementioned image capturing device, thereby improving the image recognition rate.

本發明所揭示者，乃較佳實施例之一種，舉凡局部之變更或修飾而源於本發明之技術思想而為熟習該項技藝知人所易於推知者，俱不脫本發明之專利權範疇。What is disclosed in the present invention is one of the preferred embodiments, and any partial changes or modifications originating from the technical idea of the present invention and easily inferred by those skilled in the art are within the scope of the patent right of the present invention.

綜上所陳，本案無論目的、手段與功效，皆顯示其迥異於習知技術，且其首先發明合於實用，確實符合發明之專利要件，懇請　貴審查委員明察，並早日賜予專利俾嘉惠社會，是為至禱。To sum up, regardless of the purpose, means and effect of this case, it shows that it is completely different from the conventional technology, and its first invention is suitable for practical use, and indeed meets the patent requirements of the invention. Society is to pray for the best.

100:圖像採集裝置 110:共模雜訊監測模組 111:充電狀態偵測單元 112:比較單元 120:控制單元 130:增益可調的虛設的前端放大器 140:增益可調前端放大器陣列 150:感測元件陣列 200:資訊處理裝置 210:中央處理單元 220:圖像採集裝置 步驟a:利用一共模雜訊監測模組偵測一共模雜訊，並在偵測到所述共模雜訊時降低一增益可調的虛設的前端放大器及一增益可調前端放大器陣列中各個放大器的增益 步驟b:將該增益可調前端放大器陣列中各所述放大器的輸出信號與該增益可調的虛設的前端放大器的輸出信號各進行一減法運算以去除所述共模雜訊 100: Image acquisition device 110: Common mode noise monitoring module 111: Charge state detection unit 112: Comparison Unit 120: Control unit 130: Dummy front-end amplifier with adjustable gain 140: Gain adjustable front-end amplifier array 150: Sensing element array 200: Information processing device 210: Central Processing Unit 220: Image acquisition device Step a: use a common mode noise monitoring module to detect a common mode noise, and when the common mode noise is detected, reduce a dummy front-end amplifier with adjustable gain and each in an array of adjustable gain front-end amplifiers. amplifier gain Step b: performing a subtraction operation on the output signal of each amplifier in the gain-adjustable front-end amplifier array and the output signal of the gain-adjustable dummy front-end amplifier to remove the common mode noise

為進一步揭示本發明之具體技術內容，首先請參閱圖式，其中： 圖1繪示本發明之可降低共模干擾之圖像採集裝置之一實施例的方塊圖。 圖2a及2b繪示圖1中之共模雜訊監測模組之兩個實施例的方塊圖。 圖3繪示本發明之降低共模干擾的方法之一實施例之流程圖。 圖4繪示本發明之資訊處理裝置之一實施例之方塊圖。 In order to further disclose the specific technical content of the present invention, please refer to the drawings first, wherein: FIG. 1 is a block diagram illustrating an embodiment of an image capture device capable of reducing common mode interference according to the present invention. 2a and 2b are block diagrams illustrating two embodiments of the common mode noise monitoring module in FIG. 1 . FIG. 3 is a flowchart illustrating an embodiment of a method for reducing common mode interference of the present invention. FIG. 4 is a block diagram illustrating an embodiment of the information processing apparatus of the present invention.

步驟a:利用一共模雜訊監測模組偵測一共模雜訊，並在偵測到所述共模雜訊時降低一增益可調的虛設的前端放大器及一增益可調前端放大器陣列中各個放大器的增益 Step a: use a common mode noise monitoring module to detect a common mode noise, and when the common mode noise is detected, reduce a dummy front-end amplifier with adjustable gain and each in an array of adjustable gain front-end amplifiers. amplifier gain

步驟b:將該增益可調前端放大器陣列中各所述放大器的輸出信號與該增益可調的虛設的前端放大器的輸出信號各進行一減法運算以去除所述共模雜訊 Step b: performing a subtraction operation on the output signal of each of the amplifiers in the gain-adjustable front-end amplifier array and the output signal of the gain-adjustable dummy front-end amplifier to remove the common mode noise

Claims (10)

一種降低共模干擾的方法，其包括： 利用一共模雜訊監測模組偵測一共模雜訊，並在偵測到所述共模雜訊時降低一增益可調的虛設的前端放大器及一增益可調前端放大器陣列中各個放大器的增益；以及 將該增益可調前端放大器陣列中各所述放大器的輸出信號與該增益可調的虛設的前端放大器的輸出信號各進行一減法運算以去除所述共模雜訊。 A method for reducing common mode interference, comprising: A common-mode noise monitoring module is used to detect a common-mode noise, and when the common-mode noise is detected, a gain-adjustable dummy front-end amplifier and the gain of each amplifier in the gain-adjustable front-end amplifier array are reduced ;as well as The output signal of each amplifier in the gain-adjustable front-end amplifier array and the output signal of the gain-adjustable dummy front-end amplifier are each subjected to a subtraction operation to remove the common mode noise. 如申請專利範圍第1項所述之降低共模干擾的方法，其中，該共模雜訊監測模組的偵測方式包括： 直接監測包含一圖像採集裝置之一資訊處理裝置之一充電狀態，若該充電狀態為作用狀態，則認定該圖像採集裝置存在所述共模雜訊。 The method for reducing common mode interference as described in item 1 of the claimed scope, wherein the detection methods of the common mode noise monitoring module include: A charging state of an information processing device including an image capturing device is directly monitored, and if the charging state is an active state, it is determined that the image capturing device has the common mode noise. 如申請專利範圍第1項所述之降低共模干擾的方法，其中，該共模雜訊監測模組的偵測方式包括： 將該增益可調的虛設的前端放大器的輸出信號的準位與一閾值比較，若該準位高於該閾值，則認定一圖像採集裝置存在所述共模雜訊。 The method for reducing common mode interference as described in item 1 of the claimed scope, wherein the detection methods of the common mode noise monitoring module include: The level of the output signal of the dummy front-end amplifier with adjustable gain is compared with a threshold, and if the level is higher than the threshold, it is determined that an image acquisition device has the common mode noise. 一種圖像採集裝置，其具有一共模雜訊監測模組、一增益可調的虛設的前端放大器及一增益可調前端放大器陣列以執行一降低共模干擾的方法，其中，該增益可調前端放大器陣列係用以感測一感測元件陣列，且該方法包括： 利用該共模雜訊監測模組偵測一共模雜訊，並在偵測到所述共模雜訊時降低該增益可調的虛設的前端放大器及該增益可調前端放大器陣列中各個放大器的增益；以及 將該增益可調前端放大器陣列中各所述放大器的輸出信號與該增益可調的虛設的前端放大器的輸出信號各進行一減法運算以去除所述共模雜訊。 An image acquisition device has a common-mode noise monitoring module, a dummy front-end amplifier with adjustable gain, and an array of adjustable-gain front-end amplifiers to implement a method for reducing common-mode interference, wherein the gain-adjustable front-end The amplifier array is used to sense an array of sensing elements, and the method includes: The common-mode noise monitoring module is used to detect a common-mode noise, and when the common-mode noise is detected, the gain-adjustable dummy front-end amplifier and the respective amplifiers in the gain-adjustable front-end amplifier array are reduced. gain; and The output signal of each amplifier in the gain-adjustable front-end amplifier array and the output signal of the gain-adjustable dummy front-end amplifier are each subjected to a subtraction operation to remove the common mode noise. 如申請專利範圍第4項所述之圖像採集裝置，其中，該共模雜訊監測模組的偵測方式包括： 直接監測包含該圖像採集裝置之一資訊處理裝置之一充電狀態，若該充電狀態為作用狀態，則認定該圖像採集裝置存在所述共模雜訊。 The image acquisition device as described in item 4 of the scope of the patent application, wherein the detection methods of the common mode noise monitoring module include: A charging state of an information processing device including the image capturing device is directly monitored, and if the charging state is an active state, it is determined that the image capturing device has the common mode noise. 如申請專利範圍第4項所述之圖像採集裝置，其中，該共模雜訊監測模組的偵測方式包括： 將該增益可調的虛設的前端放大器的輸出信號的準位與一閾值比較，若該準位高於該閾值，則認定該圖像採集裝置存在所述共模雜訊。 The image acquisition device as described in item 4 of the scope of the patent application, wherein the detection methods of the common mode noise monitoring module include: The level of the output signal of the dummy front-end amplifier with adjustable gain is compared with a threshold, and if the level is higher than the threshold, it is determined that the image acquisition device has the common mode noise. 一種資訊處理裝置，其具有一中央處理單元及一圖像採集裝置，其中，該中央處理單元係用以與該圖像採集裝置通信，且該圖像採集裝置具有一共模雜訊監測模組、一增益可調的虛設的前端放大器及一增益可調前端放大器陣列以執行一降低共模干擾的方法，其中，該增益可調前端放大器陣列係用以感測一感測元件陣列，且該方法包括： 利用該共模雜訊監測模組偵測一共模雜訊，並在偵測到所述共模雜訊時降低該增益可調的虛設的前端放大器及該增益可調前端放大器陣列中各個放大器的增益；以及 將該增益可調前端放大器陣列中各所述放大器的輸出信號與該增益可調的虛設的前端放大器的輸出信號各進行一減法運算以去除所述共模雜訊。 An information processing device has a central processing unit and an image acquisition device, wherein the central processing unit is used for communicating with the image acquisition device, and the image acquisition device has a common mode noise monitoring module, A gain-adjustable dummy front-end amplifier and a gain-adjustable front-end amplifier array to perform a method for reducing common mode interference, wherein the gain-adjustable front-end amplifier array is used to sense a sensing element array, and the method include: The common-mode noise monitoring module is used to detect a common-mode noise, and when the common-mode noise is detected, the gain-adjustable dummy front-end amplifier and the respective amplifiers in the gain-adjustable front-end amplifier array are reduced. gain; and The output signal of each amplifier in the gain-adjustable front-end amplifier array and the output signal of the gain-adjustable dummy front-end amplifier are each subjected to a subtraction operation to remove the common mode noise. 如申請專利範圍第7項所述之資訊處理裝置，其中，該共模雜訊監測模組的偵測方式包括： 直接監測該資訊處理裝置之一充電狀態，若該充電狀態為作用狀態，則認定該圖像採集裝置存在所述共模雜訊。 The information processing device according to claim 7, wherein the detection method of the common mode noise monitoring module includes: A charging state of the information processing device is directly monitored, and if the charging state is an active state, it is determined that the image acquisition device has the common mode noise. 如申請專利範圍第7項所述之資訊處理裝置，其中，該共模雜訊監測模組的偵測方式包括： 將該增益可調的虛設的前端放大器的輸出信號的準位與一閾值比較，若該準位高於該閾值，則認定該圖像採集裝置存在所述共模雜訊。 The information processing device according to claim 7, wherein the detection method of the common mode noise monitoring module includes: The level of the output signal of the dummy front-end amplifier with adjustable gain is compared with a threshold, and if the level is higher than the threshold, it is determined that the image acquisition device has the common mode noise. 如申請專利範圍第7項所述之資訊處理裝置，其係一攜帶型電腦或一智慧型手持裝置。The information processing device described in item 7 of the scope of the application is a portable computer or a smart handheld device.
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