Multimodal bioelectric signal anti-crosstalk collection circuit, chip and wearable device

Abstract

The embodiment of the application provides a multi-modal bioelectric signal anti-crosstalk collection circuit, a chip and a wearable device, which comprise: a first power supply module and a first bioelectric signal collection module are electrically connected, and are used for acquiring a first power supply signal and supplying power to the first bioelectric signal collection module; a first grounding end is used for providing a first grounding signal; a second grounding end is used for providing a second grounding signal, the first bioelectric signal collection module is electrically connected with the first grounding end, and is used for collecting a first bioelectric signal; an electric signal isolation module is electrically connected with the first power supply module and a second bioelectric signal collection module, is used for converting the first power supply signal into a second power supply signal, and sending the second power supply signal to the second bioelectric signal collection module; and the second bioelectric signal collection module is electrically connected with the second grounding end, and is used for collecting a second bioelectric signal.

Description

Technical Field

[0001] This application relates to the field of biosignal acquisition technology, specifically to a multimodal bioelectrical signal anti-crosstalk acquisition circuit, chip, and wearable device. Background Technology

[0002] Human bioelectrical signals have wide applications in human factors engineering, ergonomics, physiological psychology, and healthcare. Collecting multiple bioelectrical signals from subjects and analyzing or evaluating their physiological, psychological, and behavioral activities can improve the accuracy of the analysis or evaluation results. However, effective technical means are currently lacking for simultaneously collecting multiple bioelectrical signals using the same device. Summary of the Invention

[0003] This application provides a multimodal bioelectric signal anti-crosstalk acquisition circuit, chip, and wearable device.

[0004] In a first aspect, embodiments of this application provide a multimodal bioelectric signal anti-crosstalk acquisition circuit, comprising: a first bioelectric signal acquisition module, a second bioelectric signal acquisition module, a first power supply module, an electrical signal isolation module, a first grounding terminal, and a second grounding terminal;

[0005] The first power module and the first bioelectric signal acquisition module are electrically connected. The first power module is used to acquire a first power signal and provide a first power signal to the first bioelectric signal acquisition module to power the first bioelectric signal acquisition module.

[0006] The first grounding terminal is used to provide a first grounding signal;

[0007] The second grounding terminal is used to provide a second grounding signal, wherein the second grounding signal is different from the first grounding signal;

[0008] The first bioelectric signal acquisition module is electrically connected to the first grounding terminal. The first bioelectric signal acquisition module is used to acquire a first bioelectric signal. The first bioelectric signal uses the first grounding signal as a reference signal.

[0009] The electrical signal isolation module is electrically connected to the first power module and the second bioelectric signal acquisition module; the electrical signal isolation module is used to convert the first power signal provided by the first power module into a second power signal, and provide the second power signal to the second bioelectric signal acquisition module to power the second bioelectric signal acquisition module; the first power signal and the second power signal are different.

[0010] The second bioelectric signal acquisition module is electrically connected to the second grounding terminal. The second bioelectric signal acquisition module is used to acquire a second bioelectric signal, and at least a portion of the time during which the first bioelectric signal acquisition module acquires the first bioelectric signal coincides with at least a portion of the time during which the second bioelectric signal acquisition module acquires the second bioelectric signal. The second bioelectric signal and the first bioelectric signal are different types of bioelectric signals, and the second bioelectric signal uses the second grounding signal as a reference signal. The first grounding signal and the second grounding signal are different.

[0011] One possible implementation of the first aspect also includes: a processing module;

[0012] The processing module is electrically connected to the first bioelectric signal acquisition module, the first power module, the first grounding terminal and the electrical signal isolation module;

[0013] The first power module is also used to provide a first power signal to the processing module;

[0014] The electrical signal isolation module is further configured to convert the second bioelectric signal acquired by the second bioelectric signal acquisition module into a third bioelectric signal; the third bioelectric signal is a signal with the first grounding signal as a reference.

[0015] The processing module is used to acquire the first bioelectric signal and the third bioelectric signal acquired by the first bioelectric signal acquisition module, and to process the first bioelectric signal and the third bioelectric signal accordingly.

[0016] One possible implementation of the first aspect also includes: a storage module;

[0017] The storage module is electrically connected to the processing module, and the storage module is used to store the data collected by the circuit offline.

[0018] In one possible implementation of the first aspect, a second power supply module is also included;

[0019] The second power module is electrically connected to the electrical signal isolation module and the second bioelectrical signal acquisition module;

[0020] The second power module is used to acquire the second power signal output by the electrical signal isolation module, and to supply power to the second bioelectric signal acquisition module based on the second power signal.

[0021] In one possible implementation of the first aspect, the electrical signal isolation module includes a power isolation submodule and a bioelectrical signal isolation submodule;

[0022] The power isolation submodule includes a first coil and a second coil. The first coil is electrically connected to the first power module, and the second coil is electrically connected to the second power module. The second coil is used to generate a second power signal based on the first power signal transmitted by the first coil, and send the second power signal to the second power module.

[0023] The bioelectric signal isolation submodule includes a first bioelectric signal transmitter, a third coil, a fourth coil, and a first bioelectric signal receiver; the first bioelectric signal transmitter is electrically connected to the second bioelectric signal acquisition module and the second ground terminal, the third coil is electrically connected to the first bioelectric signal transmitter, the fourth coil is electrically connected to the first bioelectric signal receiver, and the first bioelectric signal receiver is electrically connected to the processing module and the first ground terminal;

[0024] The first bioelectric signal transmitter is used to generate a first analog signal based on the second bioelectric signal acquired by the second bioelectric signal acquisition module.

[0025] The fourth coil is used to generate a second analog signal based on the first analog signal transmitted by the third coil, and to send the second analog signal to the first bioelectric signal receiver;

[0026] The first bioelectric signal receiver is used to convert the second analog signal into a third bioelectric signal and transmit it to the processing module.

[0027] In one possible implementation of the first aspect, the electrical signal isolation module further includes at least one control signal isolation submodule;

[0028] For each control signal isolation submodule, the control signal isolation submodule includes a second bioelectric signal transmitter, a fifth coil, a sixth coil, and a second bioelectric signal receiver; the second bioelectric signal transmitter is electrically connected to the processing module and the first ground terminal, the fifth coil is electrically connected to the second bioelectric signal transmitter, the sixth coil is electrically connected to the second bioelectric signal receiver, and the second bioelectric signal receiver is electrically connected to the second bioelectric signal acquisition module and the second ground terminal;

[0029] The processing module is further configured to send a first control signal to the second bioelectric signal transmitter to control the second bioelectric signal acquisition module to acquire the second bioelectric signal.

[0030] The second bioelectric signal transmitter is used to generate a third analog signal based on the first control signal sent by the processing module;

[0031] The sixth coil is used to generate a fourth analog signal based on the third analog signal transmitted by the fifth coil, and to send the fourth analog signal to the second bioelectric signal receiver;

[0032] The second bioelectric signal receiver is used to convert the fourth analog signal into a second control signal and transmit it to the second bioelectric signal acquisition module, so that the second bioelectric signal acquisition module can acquire the second bioelectric signal based on the second control signal.

[0033] One possible implementation of the first aspect also includes: a processing module;

[0034] The processing module is electrically connected to the second bioelectric signal acquisition module, the second grounding terminal, and the electrical signal isolation module.

[0035] The electrical signal isolation module is also used to transmit the second power signal to the processing module and convert the first bioelectric signal acquired by the first bioelectric signal acquisition module into a fourth bioelectric signal; the fourth bioelectric signal is a signal with the second ground signal as a reference.

[0036] The processing module is used to acquire the second bioelectric signal and the fourth bioelectric signal acquired by the second bioelectric signal acquisition module, and to process the second bioelectric signal and the fourth bioelectric signal accordingly.

[0037] One possible implementation of the first aspect also includes a third bioelectric signal acquisition module;

[0038] The third bioelectric signal acquisition module is electrically connected to the electrical signal isolation module and the second grounding terminal;

[0039] The electrical signal isolation module is also used to provide a second power signal to the third bioelectric signal acquisition module;

[0040] The third bioelectric signal acquisition module is used to acquire a fifth bioelectric signal; the fifth bioelectric signal is a signal of the same type as the second bioelectric signal but of a different type than the first bioelectric signal.

[0041] In one possible implementation of the first aspect, the first bioelectric signal includes an input-acquisition type bioelectric signal; the second bioelectric signal includes an output-acquisition type bioelectric signal.

[0042] In one possible implementation of the first aspect, the first bioelectric signal includes an electrical activity signal (EDA) signal, the second bioelectric signal includes one of an electroencephalogram (EEG) signal, an electromyography (EMG) signal, and an electrocardiogram (ECG) signal; and the fifth bioelectric signal includes another of an EEG signal, an EMG signal, and an ECG signal.

[0043] In one possible implementation of the first aspect, the first bioelectric signal acquisition module includes a signal acquisition terminal, a signal amplifier, and an analog-to-digital converter;

[0044] The signal acquisition terminal is electrically connected to the input terminal of the signal amplifier, the output terminal of the signal amplifier is electrically connected to the input terminal of the analog-to-digital converter, and the output terminal of the analog-to-digital converter is electrically connected to the processing module.

[0045] Secondly, embodiments of this application provide a chip, including: the multimodal bioelectric signal anti-crosstalk acquisition circuit described in any of the first aspects above.

[0046] Thirdly, embodiments of this application provide a wearable device, including a housing, and a multimodal bioelectrical signal anti-crosstalk acquisition circuit as described in any of the first aspects or a chip as described in the second aspect, a first bioelectrical signal sensor, and a second bioelectrical signal sensor disposed within the housing; wherein, the first bioelectrical signal sensor is used to acquire a first bioelectrical signal of a subject and transmit it to a first bioelectrical signal acquisition module in the multimodal bioelectrical signal anti-crosstalk acquisition circuit as described in any of the first aspects or a chip as described in the second aspect; the second bioelectrical signal sensor is used to acquire a second bioelectrical signal of a subject and transmit it to a second bioelectrical signal acquisition module in the multimodal bioelectrical signal anti-crosstalk acquisition circuit as described in any of the first aspects or a chip as described in the second aspect.

[0047] The multimodal bioelectric signal anti-crosstalk acquisition circuit using the solution provided in this application includes a first bioelectric signal acquisition module, a second bioelectric signal acquisition module, a first power module, an electrical signal isolation module, a first grounding terminal, and a second grounding terminal. The first power module is electrically connected to the first bioelectric signal acquisition module and is used to acquire a first power signal and provide the first power signal to the first bioelectric signal acquisition module to power it. The first grounding terminal is used to provide a first grounding signal. The second grounding terminal is used to provide a second grounding signal. The first bioelectric signal acquisition module is electrically connected to the first grounding terminal and is used to acquire the first bioelectric signal. The first bioelectric signal uses the first grounding signal as a reference signal. The electrical signal isolation module is electrically connected to the first power module and the second bioelectric signal acquisition module and is used to convert the first power signal provided by the first power module into a second power signal and provide the second power signal to the second bioelectric signal acquisition module to power it. The first power signal and the second power signal are different. The second bioelectric signal acquisition module is electrically connected to the second ground terminal. The second bioelectric signal acquisition module is used to acquire the second bioelectric signal, and at least a portion of the time during which the second bioelectric signal acquisition module acquires the second bioelectric signal coincides with at least a portion of the time during which the first bioelectric signal acquisition module acquires the first bioelectric signal. The second bioelectric signal and the first bioelectric signal are different types of bioelectric signals, and the second bioelectric signal uses the second ground signal as a reference signal; the first ground signal and the second ground signal are different. Therefore, in this embodiment, the multimodal bioelectric signal anti-crosstalk acquisition circuit includes not only the first bioelectric signal acquisition module but also the second bioelectric signal acquisition module. Thus, it can simultaneously acquire the first and second bioelectric signals. Furthermore, the acquisition circuit can provide different ground signals and power signals to the first and second bioelectric signal acquisition modules respectively, so that when the first and second bioelectric signal acquisition modules simultaneously acquire the first and second bioelectric signals, they will not interfere with each other due to the difference in power signals and ground signals. In other words, the multimodal bioelectric signal anti-crosstalk acquisition circuit provided in this application embodiment, while simultaneously acquiring the first bioelectric signal and the second bioelectric signal, ensures that the first bioelectric signal and the second bioelectric signal do not cause crosstalk due to the isolation between the power signals and ground signals between the first bioelectric signal acquisition module and the second bioelectric signal acquisition module. This reduces the complexity of acquiring the first bioelectric signal and the second bioelectric signal by the multimodal bioelectric signal anti-crosstalk acquisition circuit, solves the crosstalk problem when acquiring multiple bioelectric signals simultaneously in the same device or the same circuit, and thus enables the simultaneous acquisition of multiple bioelectric signals in the same circuit or the same device, thereby improving the efficiency and accuracy of bioelectric signal acquisition. Attached Figure Description

[0048] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 A schematic diagram of a multimodal bioelectric signal anti-crosstalk acquisition circuit provided in this application embodiment;

[0050] Figure 2 A schematic diagram of another multimodal bioelectric signal anti-crosstalk acquisition circuit provided in this application embodiment;

[0051] Figure 3 A schematic diagram of another multimodal bioelectric signal anti-crosstalk acquisition circuit provided in this application embodiment;

[0052] Figure 4 A schematic diagram of another multimodal bioelectric signal anti-crosstalk acquisition circuit provided in this application embodiment;

[0053] Figure 5 A schematic diagram of another multimodal bioelectric signal anti-crosstalk acquisition circuit provided in this application embodiment;

[0054] Figure 6a A schematic diagram of another multimodal bioelectric signal anti-crosstalk acquisition circuit provided in this application embodiment;

[0055] Figure 6b A schematic diagram of another multimodal bioelectric signal anti-crosstalk acquisition circuit provided in this application embodiment;

[0056] Figure 7 A schematic diagram of another multimodal bioelectric signal anti-crosstalk acquisition circuit provided in this application embodiment;

[0057] Figure 8 A schematic diagram of another multimodal bioelectric signal anti-crosstalk acquisition circuit provided in this application embodiment;

[0058] Figure 9 A schematic diagram of another multimodal bioelectric signal anti-crosstalk acquisition circuit provided in this application embodiment;

[0059] Figure 10 A schematic diagram of another multimodal bioelectric signal anti-crosstalk acquisition circuit provided in this application embodiment. Detailed Implementation

[0060] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0061] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0062] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0063] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0064] Compared to other biological signals in the human body, bioelectrical signals are characterized by weak signal strength, high noise levels, and a narrow frequency range. These characteristics place higher demands on the acquisition and processing of bioelectrical signals to ensure their accuracy. In the embodiments of this application, different types of bioelectrical signals are also referred to as different modal bioelectrical signals; acquiring multiple bioelectrical signals is also known as acquiring multimodal bioelectrical signals. Bioelectrical signals may include, but are not limited to, EEG (Electroencephalography) signals, EDA (Electrodermal Activity) signals, EMG (Electromyography) signals, or ECG (Electrocardiogram) signals.

[0065] To improve the accuracy of testing subjects' physiological states and behavioral activities, various bioelectrical signals can be collected for comprehensive analysis and evaluation. In one possible application example, the skin conductance response (EAS) is one of the most sensitive emotional feedback mechanisms, originating from the autonomous activation of sweat glands in the skin. Closely related to emotions, arousal, and attention, it is one of the most widely used measurement indicators in physiological response systems. EAS can serve as a good indicator for evaluating an individual's physiological arousal, cognitive load, effort level, emotional response, and stress tolerance. Therefore, when collecting bioelectrical signals, EDA signals and other bioelectrical signals, such as EEG signals, are usually collected. The inventors discovered during the implementation of the embodiments of this application that the EAS is caused by changes in skin resistance resulting from the dilation and contraction of blood vessels and sweat gland secretion caused by the activity of the autonomic nervous system when the body is stimulated by external factors or changes in emotional state. During EDA signal acquisition, a pair of electrodes can be placed on the skin surface, and a small, constant power signal can be applied. The current flowing through the skin is proportional to the skin conductance. After current-voltage conversion, the change in skin conductance is recorded, yielding the EDA signal. Because EDA signal acquisition requires applying a small, constant electrical signal to the skin surface, and skin is conductive, if other bioelectrical signals, such as EEG signals, are acquired simultaneously during EDA signal acquisition, the small electrical signal applied to the skin surface will be conducted to the EEG signal acquisition point, causing interference and leading to inaccurate EEG signal acquisition. To improve the accuracy of acquiring multiple bioelectrical signals, different bioelectrical signals can be acquired using different devices. Alternatively, multiple bioelectrical signals can be acquired using the same device. In this case, to reduce interference during bioelectrical signal acquisition, different bioelectrical signals need to be acquired at different times. That is, only one bioelectrical signal can be acquired at a time, resulting in low efficiency and high complexity in acquiring multiple bioelectrical signals. Furthermore, it is impossible to simultaneously acquire multiple bioelectrical signals from the subject at the same time.

[0066] This application provides a multimodal bioelectrical signal anti-crosstalk acquisition circuit, chip, and wearable device. The multimodal bioelectrical signal anti-crosstalk acquisition circuit includes a first bioelectrical signal acquisition module, a second bioelectrical signal acquisition module, a first power module, an electrical signal isolation module, a first ground terminal, and a second ground terminal. The first power module is electrically connected to the first bioelectrical signal acquisition module and is used to acquire a first power signal and provide the first power signal to the first bioelectrical signal acquisition module to power the first bioelectrical signal. The first ground terminal is used to provide a first ground signal. The second ground terminal is used to provide a second ground signal. The first bioelectrical signal acquisition module is electrically connected to the first ground terminal and is used to acquire the first bioelectrical signal. The first bioelectrical signal uses the first ground signal as a reference signal. The electrical signal isolation module is electrically connected to the first power module and the second bioelectrical signal acquisition module. The electrical signal isolation module is used to convert the first power signal provided by the first power module into a second power signal and provide the second power signal to the second bioelectrical signal acquisition module to power the second bioelectrical signal acquisition module. The first power signal and the second power signal are different. The second bioelectric signal acquisition module is electrically connected to the second grounding terminal. The second bioelectric signal acquisition module is used to acquire a second bioelectric signal, and at least a portion of the time during which the second bioelectric signal acquisition module acquires the second bioelectric signal coincides with at least a portion of the time during which the first bioelectric signal acquisition module acquires the first bioelectric signal. The second bioelectric signal and the first bioelectric signal are different bioelectric signals, and the second bioelectric signal uses the second grounding signal as a reference signal; the first grounding signal is different from the second grounding signal. Thus, in this embodiment, the multimodal bioelectrical signal anti-crosstalk acquisition circuit includes not only a first bioelectrical signal acquisition module but also a second bioelectrical signal acquisition module. Therefore, it can simultaneously acquire both the first and second bioelectrical signals. To reduce crosstalk between the first and second bioelectrical signals, the first power module in the multimodal bioelectrical signal anti-crosstalk acquisition circuit provides a first power signal to the first bioelectrical signal acquisition module, and the first ground terminal provides a first ground signal to the first bioelectrical signal acquisition module. The electrical signal isolation module provides a second power signal to the second bioelectrical signal acquisition module, and the second ground terminal provides a second ground signal to the second bioelectrical signal acquisition module. In this way, the power signals and ground signals between the first and second bioelectrical signal acquisition modules are different; that is, the first and second bioelectrical signal acquisition modules operate on different power supply systems. Therefore, the first bioelectrical signal acquisition module cannot recognize the second bioelectrical signal, and the second bioelectrical signal acquisition module cannot recognize the first bioelectrical signal. Based on this, when the first bioelectric signal acquisition module acquires the first bioelectric signal, and the second bioelectric signal acquisition module acquires the second bioelectric signal, there will be no crosstalk between them.Therefore, the multimodal bioelectrical signal anti-crosstalk acquisition circuit provided in this application embodiment can simultaneously acquire the first bioelectrical signal and the second bioelectrical signal, and the first bioelectrical signal and the second bioelectrical signal will not cause crosstalk, thereby reducing the complexity of the multimodal bioelectrical signal anti-crosstalk acquisition circuit in acquiring the first bioelectrical signal and the second bioelectrical signal, and improving the efficiency of bioelectrical signal acquisition. In other words, this application embodiment solves the problem of crosstalk between multiple bioelectrical signals when acquiring multiple bioelectrical signals simultaneously in the same device or the same circuit in related technologies, making it possible to acquire multiple bioelectrical signals simultaneously in the same circuit or the same device, reducing the complexity of bioelectrical signal acquisition. Furthermore, in this application embodiment, different bioelectrical signals of the subject can be acquired simultaneously at the same time, thereby improving the accuracy of testing the subject's physiological state and activity behavior. A detailed description follows.

[0067] See Figure 1 This is a schematic diagram of a multimodal bioelectrical signal anti-crosstalk acquisition circuit provided in an embodiment of this application. Figure 1 As shown, the multimodal bioelectric signal anti-crosstalk acquisition circuit includes:

[0068] The system includes a first bioelectric signal acquisition module 11, a second bioelectric signal acquisition module 12, a first power supply module 13, an electrical signal isolation module 14, a first grounding terminal 15, and a second grounding terminal 16.

[0069] The first power module 13 is electrically connected to the first bioelectric signal acquisition module 11. The first power module 13 is used to acquire a first power signal and amplify the first power signal to the first bioelectric signal acquisition module 11 to supply power to the first bioelectric signal acquisition module 11.

[0070] The first grounding terminal 15 is used to provide a first grounding signal.

[0071] The second grounding terminal 16 is used to provide a second grounding signal.

[0072] The first bioelectric signal acquisition module 11 is electrically connected to the first grounding terminal 15. The first bioelectric signal acquisition module 11 is used to acquire a first bioelectric signal. The first bioelectric signal uses the first grounding signal as a reference signal.

[0073] The electrical signal isolation module 14 is electrically connected to the first power supply module 13 and the second bioelectric signal acquisition module 12. The electrical signal isolation module 14 converts the first power signal provided by the first power supply module 13 into a second power signal, providing the second power signal to the second bioelectric signal acquisition module 12 to power it. The first power signal and the second power signal are different.

[0074] The second bioelectric signal acquisition module 12 is electrically connected to the second grounding module 16. The second bioelectric signal acquisition module 12 is used to acquire a second bioelectric signal, and at least a portion of the time during which the second bioelectric signal acquisition module 12 acquires the second bioelectric signal coincides with at least a portion of the time during which the first bioelectric signal acquisition module 11 acquires the first bioelectric signal.

[0075] The second bioelectric signal uses the second grounding signal as a reference electrical signal.

[0076] In this embodiment, the multimodal bioelectrical signal anti-crosstalk acquisition circuit includes a first bioelectrical signal acquisition module 11, a second bioelectrical signal acquisition module 12, a first power supply module 13, an electrical signal isolation module 14, a first grounding terminal 15, and a second grounding terminal 16. The first receiving terminal 15 and the second grounding terminal 16 are different grounding terminals, and the first grounding signal provided by the first grounding terminal 15 is different from the second grounding signal provided by the second grounding terminal 16. Thus, the modules electrically connected to the first grounding terminal 15 and the modules electrically connected to the second grounding terminal 16 in the multimodal bioelectrical signal anti-crosstalk acquisition circuit do not share a common ground. The first power supply module 13 can be electrically connected to the first bioelectrical signal acquisition module 11, allowing the first power supply module 13 to receive an external first power signal and supply power to the first bioelectrical signal acquisition module 11. That is, the first power supply module 13 can provide a first power signal to the first bioelectrical signal acquisition module 11, supplying power to the first bioelectrical signal acquisition module 11 through the first power signal.

[0077] The first bioelectric signal acquisition module 11 is electrically connected to the first grounding terminal 15, and acquires a first bioelectric signal. That is, the signal acquired by the first bioelectric signal acquisition module 11 is obtained using the first grounding signal provided by the first grounding terminal 15 as a reference signal. The electrical signal isolation module 14 is electrically connected to the first power module 13 and the second bioelectric signal acquisition module 12. Thus, the electrical signal isolation module 14 can convert the first power signal provided by the first power module 13 into a second power signal, and transmit the second power signal to the second bioelectric signal acquisition module 12 as its power signal, thus supplying power to the second bioelectric signal acquisition module 12. That is, the second bioelectric signal acquisition module 12 uses the second power signal as its power signal, and the first bioelectric signal acquisition module 11 uses the first power signal as its power signal. Therefore, in this embodiment, the power signals between the first bioelectric signal acquisition module 11 and the second bioelectric signal acquisition module 12 are different.

[0078] The second bioelectric signal acquisition module 12 is electrically connected to the second grounding terminal 16 and is used to acquire the second bioelectric signal. Thus, the second bioelectric signal acquired by the second bioelectric signal acquisition module 12 uses the second grounding signal provided by the second grounding terminal 16 as a reference signal. That is, in the multimodal bioelectric signal anti-crosstalk acquisition circuit, the first bioelectric signal acquisition module 11 is powered by the first power module 13 and is electrically connected to the first grounding terminal 15. The second bioelectric signal acquisition module 12 converts the first power signal into a second power signal through the electrical signal isolation module 14 and uses the second power signal as the power signal. The second bioelectric signal acquisition module 12 is electrically connected to the second grounding terminal 16. The power supply and ground terminals of the first bioelectric signal acquisition module 11 and the second bioelectric signal acquisition module 12 are different in the acquisition circuit. That is, in the multimodal bioelectric signal anti-crosstalk acquisition circuit, the power supply between the first bioelectric signal acquisition module 11 and the second bioelectric signal acquisition module 12 can be isolated through the electrical signal isolation module 14, and the ground terminals are isolated by electrically connecting the first bioelectric signal acquisition module 11 and the second bioelectric signal acquisition module 12 to different ground terminals. Thus, the first bioelectric signal acquisition module 11 and the second bioelectric signal acquisition module 12 operate on different power supply systems in the multimodal bioelectric signal anti-crosstalk acquisition circuit. Therefore, the first bioelectric signal acquired by the first bioelectric signal acquisition module 11 will not interfere with the second bioelectric signal acquired by the second bioelectric signal acquisition module 12, and similarly, the second bioelectric signal acquired by the second bioelectric signal acquisition module 12 will not interfere with the first bioelectric signal acquired by the first bioelectric signal acquisition module 11. In other words, the first bioelectric signal and the second bioelectric signal are signals that will not interfere with each other.

[0079] In some embodiments, the first bioelectrical signal can be a skin electrical signal, and the second bioelectrical signal can be a bioelectrical signal other than the skin electrical signal. Since the skin electrical signal requires a small power signal to be input to the skin during acquisition, in related technologies, if EDA and EEG are integrated into a single circuit for simultaneous acquisition, the power signal input during EDA acquisition will interfere with EEG acquisition. However, in the multimodal bioelectrical signal anti-crosstalk acquisition circuit provided in this application embodiment, the power supply and grounding terminals for EDA acquisition and EEG acquisition are isolated. This ensures that the power signal input during EDA signal acquisition is different from the EEG reference signal, and the second bioelectrical signal acquisition module 12 will not acquire this signal, thus preventing interference with the EEG.

[0080] In this embodiment, the multimodal bioelectric signal anti-crosstalk acquisition circuit can acquire the first bioelectric signal through the first bioelectric signal acquisition module 11 and the second bioelectric signal acquisition module 12 simultaneously. Since the power supply signal and grounding signal between the first bioelectric signal acquisition module 11 and the second bioelectric signal acquisition module 12 are completely different, the first bioelectric signal acquired by the first bioelectric signal acquisition module 11 and the second bioelectric signal acquired by the second bioelectric signal acquisition module 12 will not be correlated or interfere with each other. Thus, in this implementation, the first bioelectric signal and the second bioelectric signal can be acquired simultaneously by the first bioelectric signal acquisition module 11 and the second bioelectric signal acquisition module 12, realizing the simultaneous acquisition of different signals without interference between them, improving the efficiency of signal acquisition and reducing the complexity of signal acquisition.

[0081] As one possible implementation, the above-mentioned acquisition circuit, such as Figure 2 As shown, it also includes: processing module 17.

[0082] The processing module 17 is electrically connected to the first bioelectric signal acquisition module 11, the first power supply module 13, the first grounding terminal 15, and the electrical signal isolation module 14.

[0083] The first power module 13 is also used to provide a first power signal to the processing module 17.

[0084] The electrical signal isolation module 14 is also used to convert the second bioelectric signal acquired by the second bioelectric signal acquisition module 12 into a third bioelectric signal.

[0085] The third bioelectric signal uses the first grounding signal as a reference signal.

[0086] The processing module 17 is used to acquire the first bioelectric signal and the third bioelectric signal acquired by the first bioelectric signal acquisition module 11, and to process the first bioelectric signal and the third bioelectric signal accordingly.

[0087] In this embodiment, after the first bioelectric signal acquisition module 11 acquires the first bioelectric signal and the second bioelectric signal acquisition module 12 acquires the second bioelectric signal, the first and second bioelectric signals need to be processed to obtain the required information. At this time, the multimodal bioelectric signal anti-crosstalk acquisition circuit also includes a processing module 17, which is electrically connected to the first bioelectric signal acquisition module 11, the first power supply module 13, the first grounding terminal 15, and the electrical signal isolation module 14. Thus, the first bioelectric signal acquisition module 11 can directly transmit its acquired first bioelectric signal to the processing module 17. Since the processing module 17 is electrically connected to the first power supply module 13 and the first grounding terminal 15, the power supply signal and grounding signal between the processing module 17 and the first bioelectric signal acquisition module 11 are the same, meaning that the power supply terminals of the processing module 17 and the first bioelectric signal acquisition module 11 are the same and share a common ground. The processing module 17 can identify the first bioelectric signal acquired by the first bioelectric signal acquisition module 11, and the processing module 17 can directly receive the first power supply signal. However, the power supply and grounding terminals of the second bioelectric signal acquisition module 12 and the processing module 17 are different. Therefore, the processing module 17 cannot directly identify the second bioelectric signal acquired by the second bioelectric signal acquisition module 12. The electrical signal isolation module 14 is needed to convert the second bioelectric signal into a third bioelectric signal that can be recognized by the processing module 17. At this time, the electrical signal isolation module 14 is electrically connected to the second bioelectric signal acquisition module 12. The second bioelectric signal acquisition module 12 can transmit its acquired second bioelectric signal to the electrical signal isolation module 14. The electrical signal isolation module 14 converts the second bioelectric signal into a third bioelectric signal with the first grounding signal as a reference signal. The electrical signal isolation module 14 then transmits the third bioelectric signal to the processing module 17, allowing the processing module 17 to process both the first and third bioelectric signals accordingly.

[0088] The processing module 17 can share a power supply and grounding terminal with the first bioelectrical signal acquisition module 11, or it can share a power supply and grounding terminal with the second bioelectrical signal acquisition module 12. That is, as another possible implementation, such as... Figure 3 As shown, the multimodal bioelectric signal anti-crosstalk acquisition circuit also includes a processing module 17.

[0089] The processing module 17 is electrically connected to the second bioelectric signal acquisition module 12, the second grounding terminal 16, and the electrical signal isolation module 14.

[0090] The electrical signal isolation module 14 is also used to transmit the second power signal to the processing module 17 and convert the first bioelectric signal acquired by the first bioelectric signal acquisition module 11 into a fourth bioelectric signal. The fourth bioelectric signal uses the second ground signal as a reference signal.

[0091] The processing module 17 is used to acquire the second bioelectric signal and the fourth bioelectric signal acquired by the second bioelectric signal acquisition module 12, and to process the second bioelectric signal and the fourth bioelectric signal accordingly.

[0092] In this embodiment, after the first bioelectric signal acquisition module 11 acquires the first bioelectric signal and the second bioelectric signal acquisition module 12 acquires the second bioelectric signal, the first and second bioelectric signals need to be processed to obtain the required information. At this time, the multimodal bioelectric signal anti-crosstalk acquisition circuit also includes a processing module 17, which is electrically connected to the second bioelectric signal acquisition module 12, the second grounding terminal 16, and the electrical signal isolation module 14. Thus, the second bioelectric signal acquisition module 12 can directly transmit its acquired second bioelectric signal to the processing module 17. Since the processing module 17 is electrically connected to the electrical signal isolation module 14 and the second grounding terminal 16, the power supply signal and grounding signal between the processing module 17 and the second bioelectric signal acquisition module 12 are the same; that is, the power supply terminals of the processing module 17 and the second bioelectric signal acquisition module 12 are the same and share a common ground. Therefore, the processing module 17 can identify the second bioelectric signal acquired by the second bioelectric signal acquisition module 12, and the processing module 17 can directly receive the second power supply signal. However, the power supply and grounding terminals of the first bioelectric signal acquisition module 11 and the first processing module 17 are different. Therefore, the processing module 17 cannot directly identify the first bioelectric signal acquired by the first bioelectric signal acquisition module 11. The electrical signal isolation module 14 is required to convert the first bioelectric signal into a fourth bioelectric signal that can be recognized by the processing module 17. At this time, the electrical signal isolation module 14 is electrically connected to the first bioelectric signal acquisition module 11. The first bioelectric signal acquisition module 11 can transmit its acquired first bioelectric signal to the electrical signal isolation module 14. The electrical signal isolation module 14 converts the first bioelectric signal into a fourth bioelectric signal with the second ground signal as a reference signal. The electrical signal isolation module 14 then transmits the fourth bioelectric signal to the processing module 17. In this way, the processing module 17 can perform corresponding processing on the second and fourth bioelectric signals.

[0093] For ease of description, the following description will use the example where the power supply terminal and grounding terminal of the processing module 17 are the same as those of the first bioelectric signal acquisition module 11.

[0094] refer to Figure 4 As shown, the above acquisition circuit also includes a storage module 18.

[0095] The storage module 18 is electrically connected to the processing module 17. The storage module 18 is used for offline storage of data acquired by the acquisition circuit.

[0096] In other words, to prevent data loss, the data collected by the acquisition circuit can be stored offline through the storage module 18, which is a backup-level storage of the data collected by the acquisition circuit. This allows the data collected by the acquisition circuit to be recovered from the data stored in the storage module 18 in case of data loss. The data stored in the storage module 18 can be transmitted to the storage module 18 through the processing module 17. That is, the processing module 17 controls the data stored in the storage module 18. After acquiring the first bioelectrical signal and the third bioelectrical signal, the processing module 17 can transmit the first bioelectrical signal and the third bioelectrical signal to the storage module 18 for storage. In some embodiments, the storage module 18 can store the data collected by the acquisition circuit offline when the network is abnormal. When the network is normal, the data collected by the acquisition circuit can be uploaded to the host computer so that the host computer can obtain the relevant data.

[0097] For ease of implementation, the storage module 18 is electrically connected to the first power module 13 and the first grounding terminal 15.

[0098] In some embodiments, the storage module 18 can be a built-in storage chip or a expandable storage medium, such as a memory card or flash memory. Through the storage module 18, users can easily save and transmit the collected data for subsequent analysis and processing. Compared to real-time wireless data transmission, the further transmission storage module 18 ensures that the collected signal data can be stably stored, avoiding data loss or transmission errors that may occur during real-time transmission. This is crucial for applications that require long-term recording and storage of signal data. The further transmission storage module 18 ensures the complete preservation of the collected data, including all details and characteristics. In real-time wireless transmission, data packets may be lost or incomplete due to network instability or transmission delays. The storage module 18 ensures that each piece of collected data is completely saved for subsequent analysis and processing. The storage module 18 enables offline data storage, providing higher data security compared to wireless transmission. Especially in the processing and transmission of sensitive data, the storage module 18 better protects data privacy and confidentiality. Through the storage module 18, users can independently choose the time and method of data transmission. Unrestricted by network conditions and real-time transmission speed, users can choose the appropriate time to transmit data to the host computer or other devices according to their needs and convenience.

[0099] As one possible implementation, such as Figure 5 As shown, the above-mentioned multimodal bioelectric signal anti-crosstalk acquisition circuit also includes: a second power supply module 19.

[0100] The second power supply module 19 is electrically connected to the electrical signal isolation module 14 and the second bioelectric signal acquisition module 12.

[0101] The second power module 19 is used to acquire the second power signal output by the electrical signal isolation module 14, and to supply power to the second bioelectric signal acquisition module 12 based on the second power signal.

[0102] In this embodiment, after the electrical signal isolation module 14 converts the first power signal into a second power signal, in some embodiments, the second power signal needs to be adjusted before it can be transmitted to the second bioelectric signal acquisition module 12. In this case, the acquisition circuit also includes a second power module 19. The second power module 19 is electrically connected to the electrical signal isolation module 14 and the second bioelectric signal acquisition module 12. Thus, after converting the first power signal into the second power signal, the electrical signal isolation module 14 can convert the second power signal into a power signal of the required magnitude for the second bioelectric signal acquisition module 12, thereby supplying power to the second bioelectric signal acquisition module 12.

[0103] As one possible implementation, such as Figure 6a As shown, the above-mentioned electrical signal isolation module 14 includes a power isolation submodule 141 and a bioelectrical signal isolation submodule 142.

[0104] The power isolation submodule 141 includes a first coil 1411 and a second coil 1412. The first coil 1411 is electrically connected to the first power module 13, and the second coil 1412 is electrically connected to the second power module 19.

[0105] The second coil 1412 is used to generate a second power signal based on the first power signal transmitted by the first coil 1411, and send the second power signal to the second power module 19.

[0106] The bioelectric signal isolation submodule 142 includes a first bioelectric signal transmitter 1421, a third coil 1422, a fourth coil 1423, and a first bioelectric signal receiver 1424. The first bioelectric signal transmitter 1421 is electrically connected to the second bioelectric signal acquisition module 12 and the second ground terminal 16. The third coil 1422 is electrically connected to the first bioelectric signal transmitter 1421. The fourth coil 1423 is electrically connected to the first bioelectric signal receiver 1424. The first bioelectric signal receiver 1424 is electrically connected to the processing module 17 and the first ground terminal 15.

[0107] The first bioelectric signal transmitter 1421 is used to generate a first analog signal based on the second bioelectric signal acquired by the second bioelectric signal acquisition module 12.

[0108] The fourth coil 1423 is used to generate a second analog signal based on the first analog signal transmitted by the third coil 1422, and sends the second analog signal to the first bioelectric signal receiver 1424.

[0109] The first bioelectric signal receiver 1424 is used to convert the second analog signal into a third bioelectric signal and transmit it to the processing module 17.

[0110] That is, the electrical signal isolation module 14 not only needs to convert the first power signal into a second power signal, but also needs to convert the second bioelectric signal into a third bioelectric signal. Based on this, the electrical signal isolation module 14 includes a power isolation submodule 141 capable of power signal isolation and a bioelectric signal isolation submodule 142 capable of bioelectric signal isolation. The power isolation submodule 141 induces the second power signal from the first power signal through electromagnetic coupling. The power isolation submodule 141 includes a first coil 1411 and a second coil 1412. The first coil 1411 is electrically connected to the first power module 13. Thus, the first power module 13 transmits the first power signal to the first coil, which generates a changing magnetic field based on the first power signal. The second coil 1412 induces the second power signal in the changing magnetic field. The second coil then transmits the second power signal to the second power module 19. In this way, the second power signal and the first power signal are different electrical signals.

[0111] It should be understood that, in the above process, the first power signal should be an AC signal. If the first power signal output by the first power module 13 is not an AC signal, then in some embodiments, such as... Figure 6b As shown, the power isolation submodule 141 also includes a first conversion module 1413. One end of the first conversion module 1413 is electrically connected to the first power module 13, and the other end is electrically connected to the first coil 1411. In this way, the first conversion module 1413 can convert the first power signal into an AC signal and transmit the AC signal to the first coil 1411.

[0112] In some embodiments, reference Figure 6b As shown, since the induced electrical signal generated by the second coil 1412 is also an AC signal, when the second power signal acquired by the second power module 19 is a DC signal, a second conversion module 1414 can be further included in the power isolation submodule 141. One end of the second conversion module 1414 is electrically connected to the second coil 1412, and the other end is electrically connected to the second power module 19. In this way, the second conversion module 1414 can convert the AC signal induced by the second coil 1412 into a DC second power signal and transmit the second power signal to the second power module 19.

[0113] The aforementioned bioelectric signal isolation submodule 142 includes a first bioelectric signal transmitter 1421, a third coil 1422, a fourth coil 1423, and a first bioelectric signal receiver 1424. Since the processing module 17 cannot recognize the second bioelectric signal acquired by the second bioelectric signal acquisition module 12, it needs to convert the second bioelectric signal into a third bioelectric signal with the first ground signal as a reference signal so that the processing module 17 can recognize the bioelectric signal. Therefore, the electrical signal isolation module 14 includes a bioelectric signal isolation submodule 142. The bioelectric signal isolation submodule 142 includes a first bioelectric signal transmitter 1421, a third coil 1422, a fourth coil 1423, and a first bioelectric signal receiver 1424. The first bioelectric signal transmitter 1421 is electrically connected to the second bioelectric signal acquisition module 12, so that the second bioelectric signal acquisition module 12 can transmit its acquired second bioelectric signal to the first bioelectric signal transmitter 1421. In some embodiments, the second bioelectric signal output by the second bioelectric signal acquisition module 12 is a digital signal. The first bioelectric signal transmitter 1421 can generate a first analog signal of a first frequency based on the received second bioelectric signal and output the first analog signal to the third coil 1422. In other embodiments, the second bioelectric signal acquired by the second bioelectric signal acquisition module 12 may also be an analog signal. In this case, the first bioelectric signal transmitter 1421 can convert the received second bioelectric signal into a first analog signal of a first frequency and transmit the first analog signal to the third coil 1422. After receiving the first analog signal, the third coil 1422 can generate a changing magnetic field based on the first analog signal. Thus, the portion of the fourth coil 1423 located in the changing magnetic field can induce and generate a second analog signal, which is then transmitted to the first bioelectric signal receiver 1424. After receiving the second analog signal, the first bioelectric signal receiver 1424 can convert the second analog signal into a third bioelectric signal with a first ground signal as a reference signal and transmit the third bioelectric signal to the processing module 17.

[0114] In other words, the electrical signal isolation module 14 can generate signals through electromagnetic coupling, thereby achieving signal isolation.

[0115] Normally, the second bioelectric signal acquisition module 12 and the processing module 17 can communicate via SPI. In this case, when the second bioelectric signal acquisition module 12 transmits the acquired second bioelectric signal to the processing module 17, the processing module 17 needs to send a corresponding control signal to the second bioelectric signal acquisition module 12. Under the control of the control signal, the second bioelectric signal acquisition module 12 outputs the second bioelectric signal.

[0116] Based on this, in the embodiments of this application, such as Figure 7As shown, the above-mentioned electrical signal isolation module 14 also includes at least one control signal isolation submodule 143.

[0117] For each control signal isolation submodule 143, the control signal isolation submodule 143 includes a second bioelectric signal transmitter 1431, a fifth coil 1432, a sixth coil 1433, and a second bioelectric signal receiver 1434; the second bioelectric signal transmitter 1431 is electrically connected to the processing module 17 and the first ground terminal 15, the fifth coil 1432 is electrically connected to the second bioelectric signal transmitter 1431, the sixth coil 1433 is electrically connected to the second bioelectric signal receiver 1434, and the second bioelectric signal receiver is electrically connected to the second bioelectric signal acquisition module 12 and the second ground terminal 16.

[0118] The processing module 17 is also used to send a first control signal to the second bioelectric signal transmitter 1431 to control the second bioelectric signal acquisition module 12 to perform second bioelectric signal acquisition.

[0119] The second bioelectric signal transmitter 1431 is used to generate a third analog signal based on the first control signal sent by the processing module 17.

[0120] The sixth coil 1433 is used to generate a fourth analog signal based on the third analog signal transmitted by the fifth coil 1432, and sends the fourth analog signal to the second bioelectric signal receiver 1434.

[0121] The second bioelectric signal receiver 1434 is used to convert the fourth analog signal into a second control signal and transmit it to the second bioelectric signal acquisition module 12 so that the second bioelectric signal acquisition module 12 can acquire the second bioelectric signal based on the second control signal.

[0122] In this embodiment, the processing module 17 needs to send a control signal to the second bioelectric signal acquisition module 12 to control the second bioelectric signal acquisition module 12 to acquire signals. Since the power supply and grounding terminals of the processing module 17 and the second bioelectric signal acquisition module 12 are different, the second bioelectric signal acquisition module 12 cannot recognize the first control signal output by the processing module 17 and needs to convert the first control signal into a second control signal with the second grounding signal as a reference signal. Because the processing module 17 may send at least one control signal to the second bioelectric signal acquisition module 12, the electrical signal isolation module 14 includes at least one control signal isolation submodule 143. At least one control signal isolation submodule 143 is used to transmit at least one control signal, and different control signal isolation submodules 143 transmit different control signals. For example, when the communication between the second acquisition signal module 12 and the processing module 17 can be carried out via SPI, the control signals include clock signals, chip select signals, data signals output by the processing module 17, and data ready signals. Then, the electrical signal isolation module 14 includes four control signal isolation sub-modules 143, which are used to transmit clock signals, chip select signals, data signals output by the processing module 17, and data ready signals, respectively.

[0123] At this time, for each control signal isolation submodule 143, the control signal isolation submodule 143 includes a second bioelectric signal transmitter 1431, a fifth coil 1432, a sixth coil 1433, and a second bioelectric signal receiver 1434. The second bioelectric signal transmitter 1431 is electrically connected to the processing module 17 and the first ground terminal 15. The second bioelectric signal transmitter 1431 receives the first control signal output by the processing module 17. In communication mode, the first control signal is a digital signal. The second bioelectric signal transmitter 1431 is electrically connected to the first ground terminal 15, can identify the first control signal, and convert the first control signal from a digital signal into a third analog signal. The third analog signal is transmitted to the fifth coil 1432. After receiving the third analog signal, the fifth coil 1432 can generate a changing magnetic field according to the third analog signal. The sixth coil 1433 induces a fourth analog signal in the part of the changing magnetic field. The sixth coil 1433 can transmit the fourth analog signal to the second bioelectric signal receiver 1434. The second bioelectric signal receiver 1434 can use the second ground signal as a reference signal to convert the fourth analog signal into a second control signal and transmit the second control signal to the second bioelectric signal acquisition module 12. The second bioelectric signal acquisition module 12 can acquire the second bioelectric signal according to the second control signal and transmit the second bioelectric signal to the processing module 17 through the electrical signal isolation module 14.

[0124] In some embodiments, the power isolation submodule 141, the bioelectric signal isolation submodule 142, and at least one control signal isolation submodule 143 in the electrical signal isolation module 14 can be integrated into a single chip. In other embodiments, due to the limited number of pins on a single chip, the power isolation submodule 141, the bioelectric signal isolation submodule 142, and part of the control signal isolation submodule 143 in the electrical signal isolation module 14 are integrated into a single chip, while the remaining parts of the control signal isolation submodule 143 are integrated into another chip.

[0125] As one possible implementation, the aforementioned multimodal bioelectric signal anti-crosstalk acquisition circuit, such as Figure 8 As shown, it also includes: a third bioelectric signal acquisition module 20.

[0126] The third bioelectric signal acquisition module 20 is electrically connected to the electrical signal isolation module 14 and the second grounding terminal 16.

[0127] The electrical signal isolation module 14 is also used to provide a second power signal to the third bioelectric signal acquisition module 20.

[0128] The third bioelectric signal acquisition module 20 is used to acquire the fifth bioelectric signal.

[0129] Among them, the fifth bioelectric signal is any bioelectric signal other than the first and second bioelectric signals.

[0130] In this embodiment, the multimodal bioelectric signal anti-crosstalk acquisition circuit may further include other bioelectric signal acquisition modules, such as a third bioelectric signal acquisition module 20. The fifth bioelectric signal acquired by the third bioelectric signal acquisition module 20 can be a signal of the same type as the second bioelectric signal but a different type than the first bioelectric signal; that is, both the fifth and second bioelectric signals are output signals, while the first bioelectric signal is an input signal. In other words, both the fifth and second bioelectric signals are signals directly obtained from the subject, without requiring an input electrical signal. The first bioelectric signal, however, requires a small power signal to be input to the subject before it can be acquired. Therefore, there is no crosstalk between the fifth and second bioelectric signals. In this case, the second bioelectric signal acquisition module 12 and the third bioelectric signal acquisition module 20 can share a power supply terminal and a ground terminal. In other words, the third bioelectric signal acquisition module 20 is electrically connected to the electrical signal isolation module 14 and the second grounding terminal 16. Thus, the electrical signal isolation module 14 can transmit the second power signal to the third bioelectric signal acquisition module 20, supplying power to it. The third bioelectric signal acquisition module 20 can use the second grounding signal as a reference signal to acquire the fifth bioelectric signal.

[0131] In some embodiments, the third bioelectric signal acquisition module 20 can be electrically connected to the processing module 17 via the electrical signal isolation module 14. In this way, the third bioelectric signal acquisition module 20 can convert the fifth bioelectric signal it acquires into a sixth bioelectric signal with the first ground signal as a reference signal via the electrical signal isolation module 14. The processing module 17 can acquire the sixth bioelectric signal and perform corresponding processing based on the first, third, and sixth bioelectric signals.

[0132] The third bioelectric signal acquisition module 20 can be electrically connected to the processing module 17 through the electrical signal isolation module 14. The signal transmission process can be referred to the above. The second bioelectric signal acquisition module 20 can be electrically connected to the processing module 17 through the electrical signal isolation module 14. The signal transmission process will not be repeated here.

[0133] As one possible implementation, the first bioelectrical signal includes the skin conductance signal (SDF); the second bioelectrical signal includes other bioelectrical signals besides the SDF. That is, the first bioelectrical signal is an input-type acquired bioelectrical signal, and the second bioelectrical signal is an output-type acquired bioelectrical signal. An input-type acquired bioelectrical signal refers to a bioelectrical signal that requires a small electrical signal to be input to the subject before it can be acquired. An output-type acquired bioelectrical signal refers to a bioelectrical signal that can be acquired without requiring a small electrical signal to be input to the subject.

[0134] As one possible implementation, the first bioelectric signal includes an EDA signal, the second bioelectric signal includes one of the following: an EEG signal, an EMG (electromyography) signal, and an ECG (electrocardiogram) signal; and the fifth bioelectric signal includes another of the following: an EEG signal, an EMG signal, and an ECG signal.

[0135] As one possible implementation, the above-mentioned acquisition circuit, such as Figure 9 As shown, it also includes: a first voltage conversion module 21.

[0136] One end of the first voltage conversion module 21 is electrically connected to the first power supply module 13, and the other end of the first voltage conversion module 21 is electrically connected to the first bioelectric signal acquisition module 11.

[0137] The first voltage conversion module 21 is used to convert the first power signal into a first target electrical signal and transmit the first target electrical signal to the first bioelectric signal acquisition module 11 to supply power to the first bioelectric signal acquisition module 11.

[0138] In some embodiments, the first power signal acquired by the first power module 13 is not the electrical signal required by the first bioelectric signal acquisition module 11. In this case, the first voltage conversion module 21 can convert the first power signal into the electrical signal required by the first bioelectric signal acquisition module 11. That is, one end of the first voltage conversion module 21 is electrically connected to the first power module 13, so that the first power module 13 can transmit the first power signal to the first voltage conversion module 21. The first voltage conversion module 21 can convert the first power signal into the first target electrical signal required by the first bioelectric signal acquisition module 11. The other end of the first voltage conversion module 21 is electrically connected to the first bioelectric signal acquisition module 11, so that the first voltage conversion module 21 can transmit the first target electrical signal to the first bioelectric signal acquisition module 11, thus supplying power to the first bioelectric signal acquisition module 11.

[0139] It should be understood that the parameter information of the first target electrical signal can be preset in the first voltage conversion module 21, so that the first voltage conversion module 21 can convert the first power supply signal into the first target electrical signal according to the parameter information of the first target electrical signal.

[0140] As one possible implementation, such as Figure 10 As shown, the first bioelectric signal acquisition module 11 includes a signal acquisition terminal 111, a signal amplifier 112, and an analog-to-digital converter 113.

[0141] The signal acquisition terminal 111 is electrically connected to the input terminal of the signal amplifier 112, the output terminal of the signal amplifier 112 is electrically connected to the input terminal of the analog-to-digital converter 113, and the output terminal of the analog-to-digital converter 113 is electrically connected to the processing module 17.

[0142] Specifically, the first bioelectric signal acquisition module 11 includes a signal acquisition terminal 111, a signal amplifier 112, and an analog-to-digital converter 113. The signal acquisition terminal 111 acquires the first bioelectric signal and is electrically connected to the input terminal of the signal amplifier 112. Thus, the signal acquisition terminal 111 transmits the acquired first bioelectric signal to the signal amplifier 112. The signal amplifier 112 amplifies the first bioelectric signal. The output terminal of the signal amplifier 112 is electrically connected to the input terminal of the analog-to-digital converter 113. Thus, the signal amplifier 112 transmits the amplified first bioelectric signal to the analog-to-digital converter 113. Since the first bioelectric signal acquired by the signal acquisition terminal is an analog signal, while the processing module 17 needs to acquire a digital signal, the analog-to-digital converter 113 converts the amplified first bioelectric signal from an analog signal to a digital signal. The output terminal of the analog-to-digital converter 113 is electrically connected to the processing module 17, so the analog-to-digital converter 113 can transmit the converted first bioelectric signal to the processing module 17.

[0143] In this embodiment, the multimodal bioelectrical signal anti-crosstalk acquisition circuit includes not only a first bioelectrical signal acquisition module but also a second bioelectrical signal acquisition module. Therefore, it can simultaneously acquire both the first and second bioelectrical signals. Furthermore, the acquisition circuit can provide different grounding and power signals to the first and second bioelectrical signal acquisition modules respectively. This ensures that the first and second bioelectrical signal acquisition modules do not interfere with each other when simultaneously acquiring the first and second bioelectrical signals due to the difference in their power and grounding signals. In other words, the multimodal bioelectrical signal anti-crosstalk acquisition circuit provided in this embodiment, while simultaneously acquiring the first and second bioelectrical signals, prevents crosstalk between the first and second bioelectrical signals due to the isolation between their power and grounding signals. This reduces the complexity of acquiring the first and second bioelectrical signals and improves the efficiency and accuracy of bioelectrical signal acquisition.

[0144] Corresponding to the above embodiments, this application also provides a chip, which includes the multimodal bioelectric signal anti-crosstalk acquisition circuit described in the above embodiments.

[0145] Corresponding to the above embodiments, this application also provides a wearable multi-device, which includes a housing, a multimodal bioelectrical signal anti-crosstalk acquisition circuit or chip as described in the above embodiments disposed within the housing, a first bioelectrical signal sensor, and a second bioelectrical signal sensor. The first bioelectrical signal sensor is used to contact the subject to acquire the subject's first bioelectrical signal and transmit it to a first bioelectrical signal acquisition module in the multimodal bioelectrical signal anti-crosstalk acquisition circuit or chip. The second bioelectrical signal sensor is used to contact the subject to acquire the subject's second bioelectrical signal and transmit it to a second bioelectrical signal acquisition module in the multimodal bioelectrical signal anti-crosstalk acquisition circuit or chip.

[0146] The following example illustrates the use of the second bioelectric signal as an EEG signal, the first bioelectric signal as an EDA signal, and the wearable device including the multimodal bioelectric signal anti-crosstalk acquisition circuit described in the above embodiments.

[0147] This application provides a wearable device. The wearable device includes a housing, an integral main body disposed within the housing, an EEG signal electrode, an electrical signal isolation module, a first GND (Ground) electrode, a second GND electrode, and an EDA signal electrode, etc., disposed on the inner side of the main body.

[0148] In the above embodiments, the main cable is embedded inside the device, which reduces interference and impact from external cables, while also providing greater convenience and comfort. Embedding the cable inside the device reduces signal quality loss and noise interference during transmission, thereby improving the accuracy and precision of data acquisition, and consequently increasing the efficiency of data processing and analysis. The integrated design makes the device lighter, more compact, easier to carry and use, and suitable for data acquisition needs in various situations.

[0149] Furthermore, the EEG signal electrodes correspond to at least one brain region among the frontal, parietal, temporal, and occipital lobes of the subject, and include several lead electrodes for acquiring EEG signals to reflect the neuronal firing state and functional activity of the subject's brain.

[0150] The frontal, parietal, temporal, and occipital lobes are four important brain regions that play crucial roles in cognition, perception, emotion, and language. The frontal lobe, located at the front of the brain, is one of the largest lobes. It is involved in higher cognitive functions such as decision-making, planning, thinking, reasoning, and problem-solving. The frontal lobe is also related to personality, behavioral control, and social interaction. Furthermore, it controls motor execution, including muscle coordination, postural control, and voluntary movement. The parietal lobe, located in the middle of the brain, is primarily responsible for processing sensory information and spatial cognition. It is involved in the reception and processing of sensory signals such as touch, temperature, pressure, and pain. Additionally, it participates in spatial orientation, motor control, and hand-eye coordination. The temporal lobe, located on the side of the brain, is involved in hearing, memory, language comprehension, emotion, and facial recognition. The main structure of the temporal lobe is the hippocampus, which plays a vital role in memory formation and storage. Furthermore, the temporal lobe is closely related to emotion regulation, auditory processing, and language comprehension. The occipital lobe, located at the back of the brain, is primarily responsible for processing and perceiving visual information. It receives visual signals from the eyes and transforms them into the images we see. The occipital lobe is also involved in functions such as visual memory, color perception, and spatial orientation. It's important to note that the functions of these brain regions are interconnected and interactive; cognitive processes often involve the coordinated work of multiple brain regions. Furthermore, brain structure and function may vary from person to person, so specific functional details may differ.

[0151] The EEG signal electrodes of the wearable device in this embodiment correspond to at least one of the aforementioned brain regions. By placing corresponding electrodes in these brain regions, signals such as electrical activity, blood oxygenation levels, or magnetic fields in different brain regions can be acquired, thereby enabling the study of brain function and cognitive processes. This is of great significance for understanding the working principles of the brain and developing applications such as brain-computer interfaces.

[0152] The main body has a ring-shaped structure, allowing several dry electrodes of the EEG signal electrodes to correspond to the frontal and occipital lobes of the brain, thus examining the EEG signals in these two lobed regions. However, it is not limited to this; the main body can also have a helmet-shaped structure or a triangular arc-shaped edge (adding an arc-shaped edge between the ring-shaped structures) to detect EEG signals in more regions. EEG signal electrodes are used to acquire electroencephalogram (EEG) signals in brain regions such as the frontal, parietal, temporal, and occipital lobes of subjects. These dry electrodes are installed in specific locations to record the firing and functional activities of brain neurons. By acquiring and analyzing these EEG signals, we can understand the brain's activity patterns under different tasks, states, and stimuli, and further study the functions and processes of cognition, emotion, and sleep.

[0153] Furthermore, the wearable device includes an energy storage module for storing the electrical energy collected and required for its operation. The energy storage module can be a built-in battery or a rechargeable battery to power the device. Through the energy storage module, the device can operate independently of an external power source, providing portability and flexibility.

[0154] It should be understood that wearable devices may also include a power plug that is electrically connected to an external power source. In this case, the wearable device can obtain the electrical energy required for its operation through the power plug, and this embodiment of the application does not impose any limitations on this.

[0155] For ease of description, the following explanation will use a wearable device including an energy storage module as an example.

[0156] The wearable device can obtain the power signal required for its operation through the energy storage module, which is the first bioelectrical signal. The electrical signal isolation module can obtain a second power signal based on the first power signal through electromagnetic coupling, and then use the second power signal to power the EEG signal electrodes.

[0157] Furthermore, the EDA signal electrodes include at least one EDA electrode for acquiring the subject's skin conductance response signal to reflect the activity state of the autonomic nervous system. Skin conductance response is an indicator of autonomic nervous system activity, also known as electroactivity or skin conductance, reflecting the body's emotional and cognitive responses to external stimuli. The wearable device can power the EDA signal electrodes via a first power signal.

[0158] Compared to existing EDA signal electrodes, which are typically placed on the skin surface of the subject's fingers, palms, or wrists, the EDA signal electrodes in this embodiment are integrated into the main body 1 and can be located in the forehead area without hair obstruction to record skin conductance signals. These EDA signal electrodes sense changes in skin conductivity caused by sweat secretion. When the human body faces emotional arousal, stress, anxiety, or other emotional states, the activity of the autonomic nervous system causes changes in sweat secretion, thereby affecting skin conductance. By collecting and analyzing EDA signals, researchers can infer the subject's emotional state, cognitive load, stress level, etc., which is very useful for fields such as psychology research, emotion recognition, and human-computer interaction. It is important to note that proper placement and use of the EDA signal electrodes are crucial for data quality and result interpretation. Ensure that the electrodes are in close contact with the skin and avoid external factors that interfere with the signal, such as motion or electromagnetic interference, to obtain accurate and reliable EDA signals. Optionally, two or more EDA signal electrodes may be provided.

[0159] Furthermore, the wearable device includes a first GND electrode (Ground) and a second GND electrode. The second GND electrode is located at the center of the arc-shaped segment of the forehead. The first GND electrode is a first ground electrode, used to provide a reference potential for the EDA signal electrode and reduce external interference. The second GND electrode is a second ground electrode, used to provide a reference potential for the EEG signal electrode and reduce external interference.

[0160] The first GND electrode provides a first reference potential for measuring the potential difference recorded by other EDA signal electrodes.

[0161] The second GND electrode provides a reference potential for measuring the potential difference recorded by other EEG signal electrodes. Placing the second GND electrode at the center of the forehead arc segment 11 provides a good reference point and a stable reference potential. One function of the second GND electrode is to reduce the influence of external environmental interference on EEG signals. Placing the second GND electrode at the center of the forehead arc segment minimizes noise and interference from the surrounding environment, improving signal purity. Placing the second GND electrode at the center of the forehead arc segment also achieves better wearing balance and stability, making the user more comfortable during wear.

[0162] In this way, the power supply signal for the EEG signal electrode in the wearable device is provided through the electrical signal isolation module, and the ground signal is provided through the second GND electrode. The power supply signal for the EDA signal electrode is provided through the energy storage module, and the ground signal is provided through the first GND electrode. The power supply and ground terminals of the EEG signal electrode and the EDA signal electrode in the wearable device are different. That is, the wearable device isolates the power supply and ground terminals of the EEG signal electrode and the EDA signal electrode. Thus, when the EDA signal electrode inputs a small power signal to the subject, it will not be collected by the EEG signal electrode. When the wearable device simultaneously collects EEG and EDA signals, the EEG and EDA signals are isolated from each other, preventing interference and making the signals collected simultaneously by the wearable device more accurate.

[0163] The above embodiments are for illustrative purposes only. The number and layout of the electrode trunks can be selected according to research needs and experimental design. It is important to note that EEG signals from different brain regions have different characteristics and meanings; therefore, selecting appropriate electrode trunk locations is crucial in research. Depending on the research objectives, other specific brain regions may be selected to observe corresponding EEG activity and further analyze its association with specific behaviors, cognitive functions, or disease states.

[0164] In some embodiments, the wearable device further includes a processor. The processor is electrically connected to an energy storage module, which can power the processor, and the processor can be electrically connected to a first GND electrode. That is, the processor can have the same power supply and grounding terminals as the EDA signal electrode. In this case, the processor can be directly electrically connected to the EDA signal electrode, which can send the acquired EDA signal to the processor.

[0165] Because the power supply and grounding terminals of the processor and the EEG signal electrodes are different, the processor cannot recognize the EEG signals collected by the EEG signal electrodes. In order to send the EEG signals collected by the EEG signal electrodes to the processor, the EEG signal electrodes can convert the EEG signals into EEG signals with the first reference potential as the reference signal through an electrical signal isolation module. The converted EEG signals are then sent to the processor so that the processor can perform corresponding processing based on the EEG signals and EDA signals, so as to fully reflect the subject's physiological state and activity behavior.

[0166] In the above embodiments, the wearable device can be an integrated structure, such as a helmet or headgear with a head-mounted structure, which has small disturbance error and good stability during signal transmission; and the device can simultaneously collect EEG signals and EDA signals, and the EEG signals and EDA signals are isolated from each other and will not interfere with each other. The EEG signals and EDA signals collected by the wearable device are relatively accurate and can fully reflect the physiological state and activity behavior of the subject.

[0167] Those skilled in the art will clearly understand that the techniques in the embodiments of the present invention can be implemented using software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solutions in the embodiments of the present invention, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or certain parts of the embodiments of the present invention.

[0168] The same or similar parts between the various embodiments in this specification can be referred to mutually. In particular, the device embodiments and terminal embodiments are basically similar to the method embodiments, so the description is relatively simple, and the relevant parts can be referred to the description in the method embodiments.

Claims

1. A multimodal bioelectrical signal anti-crosstalk acquisition circuit, characterized in that, include: First bioelectric signal acquisition module, second bioelectric signal acquisition module, first power supply module, electrical signal isolation module, first grounding terminal, second grounding terminal; The first power module and the first bioelectric signal acquisition module are electrically connected. The first power module is used to acquire a first power signal and provide a first power signal to the first bioelectric signal acquisition module to power the first bioelectric signal acquisition module. The first grounding terminal is used to provide a first grounding signal; The second grounding terminal is used to provide a second grounding signal, wherein the second grounding signal is different from the first grounding signal; The first bioelectric signal acquisition module is electrically connected to the first grounding terminal. The first bioelectric signal acquisition module is used to acquire a first bioelectric signal. The first bioelectric signal uses the first grounding signal as a reference signal. The electrical signal isolation module is electrically connected to the first power module and the second bioelectric signal acquisition module; the electrical signal isolation module is used to convert the first power signal provided by the first power module into a second power signal, and provide the second power signal to the second bioelectric signal acquisition module to power the second bioelectric signal acquisition module; the first power signal and the second power signal are different. The second bioelectric signal acquisition module is electrically connected to the second grounding terminal. The second bioelectric signal acquisition module is used to acquire a second bioelectric signal, and at least a portion of the time during which the first bioelectric signal acquisition module acquires the first bioelectric signal coincides with at least a portion of the time during which the second bioelectric signal acquisition module acquires the second bioelectric signal. The second bioelectric signal and the first bioelectric signal are different types of bioelectric signals, and the second bioelectric signal uses the second grounding signal as a reference signal. The first grounding signal and the second grounding signal are different.

2. The circuit according to claim 1, characterized in that, Also includes: Processing module; The processing module is electrically connected to the first bioelectric signal acquisition module, the first power module, the first grounding terminal and the electrical signal isolation module; The first power module is also used to provide a first power signal to the processing module; The electrical signal isolation module is further configured to convert the second bioelectric signal acquired by the second bioelectric signal acquisition module into a third bioelectric signal; the third bioelectric signal uses the first grounding signal as a reference signal. The processing module is used to acquire the first bioelectric signal and the third bioelectric signal acquired by the first bioelectric signal acquisition module, and to process the first bioelectric signal and the third bioelectric signal accordingly.

3. The circuit according to claim 2, characterized in that, Also includes: Storage module; The storage module is electrically connected to the processing module, and the storage module is used to store the data collected by the circuit offline.

4. The circuit according to claim 2, characterized in that, Also includes: Second power supply module; The second power module is electrically connected to the electrical signal isolation module and the second bioelectrical signal acquisition module; The second power module is used to acquire the second power signal output by the electrical signal isolation module, and to supply power to the second bioelectric signal acquisition module based on the second power signal.

5. The circuit according to claim 4, characterized in that, The electrical signal isolation module includes a power isolation submodule and a bioelectrical signal isolation submodule; The power isolation submodule includes a first coil and a second coil. The first coil is electrically connected to the first power module, and the second coil is electrically connected to the second power module. The second coil is used to generate a second power signal based on the first power signal transmitted by the first coil, and send the second power signal to the second power module. The bioelectric signal isolation submodule includes a first bioelectric signal transmitter, a third coil, a fourth coil, and a first bioelectric signal receiver; the first bioelectric signal transmitter is electrically connected to the second bioelectric signal acquisition module and the second ground terminal, the third coil is electrically connected to the first bioelectric signal transmitter, the fourth coil is electrically connected to the first bioelectric signal receiver, and the first bioelectric signal receiver is electrically connected to the processing module and the first ground terminal; The first bioelectric signal transmitter is used to generate a first analog signal based on the second bioelectric signal acquired by the second bioelectric signal acquisition module. The fourth coil is used to generate a second analog signal based on the first analog signal transmitted by the third coil, and to send the second analog signal to the first bioelectric signal receiver; The first bioelectric signal receiver is used to convert the second analog signal into a third bioelectric signal and transmit it to the processing module.

6. The circuit according to claim 5, characterized in that, The electrical signal isolation module further includes at least one control signal isolation submodule; For each control signal isolation submodule, the control signal isolation submodule includes a second bioelectric signal transmitter, a fifth coil, a sixth coil, and a second bioelectric signal receiver; the second bioelectric signal transmitter is electrically connected to the processing module and the first ground terminal, the fifth coil is electrically connected to the second bioelectric signal transmitter, the sixth coil is electrically connected to the second bioelectric signal receiver, and the second bioelectric signal receiver is electrically connected to the second bioelectric signal acquisition module and the second ground terminal; The processing module is further configured to send a first control signal to the second bioelectric signal transmitter to control the second bioelectric signal acquisition module to acquire the second bioelectric signal. The second bioelectric signal transmitter is used to generate a third analog signal based on the first control signal sent by the processing module; The sixth coil is used to generate a fourth analog signal based on the third analog signal transmitted by the fifth coil, and to send the fourth analog signal to the second bioelectric signal receiver; The second bioelectric signal receiver is used to convert the fourth analog signal into a second control signal and transmit it to the second bioelectric signal acquisition module, so that the second bioelectric signal acquisition module can acquire the second bioelectric signal based on the second control signal.

7. The circuit according to claim 1, characterized in that, Also includes: Processing module; The processing module is electrically connected to the second bioelectric signal acquisition module, the second grounding terminal, and the electrical signal isolation module. The electrical signal isolation module is also used to transmit the second power signal to the processing module and convert the first bioelectric signal acquired by the first bioelectric signal acquisition module into a fourth bioelectric signal; the fourth bioelectric signal uses the second ground signal as a reference signal. The processing module is used to acquire the second bioelectric signal and the fourth bioelectric signal acquired by the second bioelectric signal acquisition module, and to process the second bioelectric signal and the fourth bioelectric signal accordingly.

8. The circuit according to claim 1, characterized in that, It also includes a third bioelectric signal acquisition module; The third bioelectric signal acquisition module is electrically connected to the electrical signal isolation module and the second grounding terminal; The electrical signal isolation module is also used to provide a second power signal to the third bioelectric signal acquisition module; The third bioelectric signal acquisition module is used to acquire a fifth bioelectric signal; the fifth bioelectric signal is a signal of the same type as the second bioelectric signal but of a different type than the first bioelectric signal.

9. The circuit according to any one of claims 1-8, characterized in that, The first bioelectric signal includes an input-type bioelectric signal; the second bioelectric signal includes an output-type bioelectric signal.

10. The circuit according to claim 9, characterized in that, The first bioelectric signal includes an electrical activity signal (EDA) signal; the second bioelectric signal includes one of an electroencephalogram (EEG) signal, an electromyography (EMG) signal, and an electrocardiogram (ECG) signal; and the fifth bioelectric signal includes another of an EEG signal, an EMG signal, and an ECG signal.

11. The circuit according to claim 2 or 3, characterized in that, The first bioelectric signal acquisition module includes a signal acquisition terminal, a signal amplifier, and an analog-to-digital converter; The signal acquisition terminal is electrically connected to the input terminal of the signal amplifier, the output terminal of the signal amplifier is electrically connected to the input terminal of the analog-to-digital converter, and the output terminal of the analog-to-digital converter is electrically connected to the processing module.

12. A chip, characterized in that, It includes the multimodal bioelectric signal anti-crosstalk acquisition circuit as described in any one of claims 1-11.

13. A wearable device, characterized in that, The device includes a housing and a multimodal bioelectrical signal anti-crosstalk acquisition circuit as described in any one of claims 1-11 disposed within the housing, or includes the chip as described in claim 12, a first bioelectrical signal sensor, and a second bioelectrical signal sensor; wherein the first bioelectrical signal sensor is used to acquire a first bioelectrical signal from the subject and transmit it to the circuit as described in any one of claims 1-11 or the first bioelectrical signal acquisition module in the chip as described in claim 12; the second bioelectrical signal sensor is used to acquire a second bioelectrical signal from the subject and transmit it to the circuit as described in any one of claims 1-11 or the second bioelectrical signal acquisition module in the chip as described in claim 12.

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