CN114831647A

CN114831647A - Electrocardio information detection device and wearable equipment

Info

Publication number: CN114831647A
Application number: CN202110137880.7A
Authority: CN
Inventors: 王野; 李登; 郭浩东; 胡轶
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-02-01
Filing date: 2021-02-01
Publication date: 2022-08-02

Abstract

The application relates to an electrocardio information detection device and wearable equipment, the device includes: the electrocardio-detecting circuit comprises a first electrode group, a second electrode group, an electrocardio-detecting circuit and a control circuit, wherein the control circuit is used for controlling electrodes in the first electrode group and electrodes in the second electrode group to be connected with the electrocardio-detecting circuit in different connection modes, so that the electrocardio-detecting circuit respectively outputs a first signal, a second signal and a third signal in different connection modes, and the control circuit is also used for weakening the interference signal in the first signal according to the second signal and the third signal. According to the electrocardio information detection device, the interference signals in the first signal can be weakened according to the second signal and the third signal, so that the detection accuracy is higher.

Description

Electrocardio information detection device and wearable equipment

Technical Field

The application relates to the technical field of terminals, in particular to an electrocardiogram information detection device and wearable equipment.

Background

The cardiac pulsation causes a bioelectricity change in a human body, generates an electric signal in the human body, acquires the electric signal caused by the cardiac pulsation to obtain an electrocardiographic signal, and obtains electrocardiographic information reflecting a cardiac state based on the electrocardiographic signal, such as the electrocardiographic signal itself, a oscillogram of the electrocardiographic signal, various types of electrocardiograms obtained by processing the electrocardiographic signal, cardiac physiological indexes, and the like. Currently, cardiovascular diseases have become one of the major diseases that endanger human health. The long-term collection of the human body electrocardiogram information can provide important information for the prevention of chronic diseases of the heart and the postoperative rehabilitation monitoring of diseases such as heart diseases, and can relieve the social medical pressure brought by the aging of the population, so that related researches become hot spots in recent years.

The prior art provides a wearable device, which acquires electrical signals at different positions on two sides of a heart of a detection object through electrodes, inputs the electrical signals into an electrocardiograph detection circuit, and obtains electrocardiograph signals after processing. Fig. 1a shows a block diagram of a prior art ecg detection circuit of a wearable device.

As shown in fig. 1a, the electrocardiograph detection circuit may include an instrumentation amplifier 2011, a right leg driving circuit 2012 and an analog-to-digital converter 2013, a first electrocardiograph signal input end (ECGP end) and a second electrocardiograph signal input end (ECGN end) of the electrocardiograph detection circuit may be two input ends of the instrumentation amplifier, one output end (RLD end) of the electrocardiograph detection circuit is an output end of the right leg driving circuit 2012 that transmits a common mode signal back to a body surface of a detected object, another output end (DOUT end) of the electrocardiograph detection circuit is an output end of the analog-to-digital converter 2013, and the analog-to-digital converter 2013 performs analog-to-digital conversion on an output signal of the instrumentation amplifier. The central electrical detection circuit in the prior art may have various implementations, for example, it may be composed of independent sub-circuits, or it may be packaged as a chip, such as AD8233 chip of idenean semiconductor, MAX30001 chip of mein semiconductor, or AFE4900 of texas instruments. In the prior art, the two electrodes can be used for respectively collecting electric signals of different parts of the body on two sides of the heart, the electric signals are respectively input into a first electrocardiogram signal input end (ECGP end) and a second electrocardiogram signal input end (ECGN end), the output end RLD of the right leg driving circuit is connected to the body surface through the electrodes, and the electrocardiosignals can be obtained at the output end DOUT.

However, wearable devices for long-term acquisition of electrocardiographic information still have a series of problems, for example, because the wearer moves, and the wrist or other parts of the body shake during information acquisition, so that inaccurate motion artifacts appear in the output signal, and the signal line generates baseline drift during display; moreover, in the information acquisition process, the wearable device is in contact with the skin, the acquired signals also comprise electromyographic signals irrelevant to the electrocardiosignals, impedance mismatch is caused by instability of contact, and large high-frequency noise is introduced. Various interference factors cause deviation between an output signal of the electrocardio detection circuit and an ideal electrocardio signal, so that the accuracy of electrocardio information detection is not ideal.

Therefore, how to improve the accuracy of the electrocardiographic information detection becomes an urgent problem to be solved.

Disclosure of Invention

In view of this, an electrocardiogram information detection device and a wearable device are provided, which can improve the accuracy of electrocardiogram information detection.

In a first aspect, an embodiment of the present application provides an electrocardiographic information detection apparatus, where the apparatus includes: the electrocardiogram detection circuit comprises a first electrode group, a second electrode group, an electrocardiogram signal input end, a second electrocardiogram signal input end and a right leg driving circuit output end;

the first electrode set comprises a plurality of electrodes for acquiring electrical signals of a first body location, the second electrode set comprises a plurality of electrodes for acquiring electrical signals of a second body location, the first body location and the second body location are respectively located on both sides of the heart;

the control circuit is used for controlling the electrodes in the first electrode group and the electrodes in the second electrode group to be connected with the first electrocardiogram signal input end, the second electrocardiogram signal input end and the right leg driving circuit output end in different connection modes, so that the electrocardiogram detection circuit outputs a first signal, a second signal and a third signal respectively in different connection modes, wherein the first signal is obtained by connecting the electrodes in the first electrode group with the first electrocardiogram signal input end and connecting the electrodes in the second electrode group with the second electrocardiogram signal input end, and the first signal comprises an electrocardiogram signal and an interference signal; the second signal is obtained by connecting the electrodes in the first electrode group with the first electrocardiogram signal input end and the second electrocardiogram signal input end respectively; the third signal is obtained by connecting electrodes in the second electrode group to the first electrocardiogram signal input end and the second electrocardiogram signal input end respectively; the control circuit is further configured to attenuate the interfering signal in the first signal based on the second signal and the third signal.

According to the electrocardiogram information detection device, the electrodes in the first electrode group and the electrodes in the second electrode group are used for respectively acquiring electric signals of body positions at two sides of a heart, and the acquired electric signals are respectively input into the first electrocardiogram signal input end and the second electrocardiogram signal input end, so that a first signal comprising an electrocardiogram signal and interference signals respectively introduced by the first electrode group and the second electrode group can be obtained; acquiring electric signals of body positions on the same side of the heart through electrodes in the first electrode group respectively, and inputting the acquired electric signals into the first electrocardiogram signal input end and the second electrocardiogram signal input end respectively to obtain a second signal comprising interference signals introduced by the first electrode group; the electrical signals of the body position on the same side of the heart are respectively collected through the electrodes in the second electrode group, and the collected electrical signals are respectively input into the first electrocardiogram signal input end and the second electrocardiogram signal input end, so that a third signal comprising interference signals introduced by the second electrode group can be obtained. Therefore, the interference signal in the first signal can be weakened according to the second signal and the third signal, and the accuracy of the processed first signal is higher.

In a first possible implementation manner of the electrocardiographic information detection apparatus according to the first aspect, the electrodes used for generating the second signal include at least one electrode used for generating the first signal, and the electrodes used for generating the third signal include at least one electrode used for generating the first signal.

Because the electrode used for generating the second signal comprises at least one electrode used for generating the first signal, and the electrode used for generating the third signal comprises at least one electrode used for generating the first signal, the interference signal introduced by the electrode in the first signal can be weakened by the interference signal introduced by the corresponding electrode in the second signal and the third signal, and the accuracy of the processed first signal is improved.

In a second possible implementation manner of the electrocardiographic information detection apparatus according to the first aspect or the first possible implementation manner of the first aspect, the first electrode group includes a first electrode and a second electrode, and the second electrode group includes a third electrode and a fourth electrode; the control circuit controls one of the first electrode and the second electrode to be connected with the first electrocardiogram signal input end, one of the third electrode and the fourth electrode to be connected with the second electrocardiogram signal input end, and the other of the first electrode and the second electrode or the other of the third electrode and the fourth electrode to be connected with the right leg driving circuit output end in a first connection mode, so that the electrocardiogram detecting circuit generates the first signal.

Through a first connection mode, an electric signal acquired by an electrode in the first electrode group and an electric signal acquired by an electrode in the second electrode group are input to the electrocardiogram detection circuit through the first electrocardiogram signal input end and the second electrocardiogram signal input end to generate a first signal, and meanwhile, the other electrode in the first electrode group or the other electrode in the second electrode group is connected with the output end of the right leg driving circuit of the electrocardiogram detection circuit to realize common mode rejection.

In a third possible implementation manner of the electrocardiographic information detecting device according to the first aspect or any one of the above implementation manners of the first aspect, the first electrode group includes a first electrode and a second electrode, and the second electrode group includes a third electrode and a fourth electrode; and the control circuit controls the first electrode and the second electrode to be respectively connected with the first electrocardiogram signal input end and the second electrocardiogram signal input end in a second connection mode, and controls one of the third electrode and the fourth electrode to be connected with the output end of the right leg driving circuit, so that the electrocardiogram detecting circuit generates the second signal.

Through a second connection mode, an electric signal acquired by the electrodes in the first electrode group is input to the electrocardio detection circuit through the first electrocardiogram signal input end and the second electrocardiogram signal input end to generate a second signal, and meanwhile, one electrode in the second electrode group is connected with the output end of the right leg driving circuit of the electrocardio detection circuit to realize common mode suppression.

In a fourth possible implementation manner of the electrocardiographic information detection apparatus according to the first aspect or any one of the above implementation manners of the first aspect, the first electrode group includes a first electrode and a second electrode, and the second electrode group includes a third electrode and a fourth electrode; and the control circuit controls the third electrode and the fourth electrode to be respectively connected with the first electrocardiogram signal input end and the second electrocardiogram signal input end in a third connection mode, and controls one of the first electrode and the second electrode to be connected with the output end of the right leg driving circuit, so that the electrocardiogram detecting circuit generates the third signal.

Through a third connection mode, an electric signal acquired by the electrodes in the second electrode group is input to the electrocardio detection circuit through the first electrocardiogram signal input end and the second electrocardiogram signal input end to generate a third signal, and meanwhile, one electrode in the first electrode group is connected with the output end of the right leg driving circuit of the electrocardio detection circuit to realize common mode suppression.

According to the first aspect or any one of the foregoing implementation manners of the first aspect, in a fifth possible implementation manner of the electrocardiographic information detecting device, the device further includes a plurality of switches, the plurality of switches are connected among the first electrode group, the second electrode group, and the electrocardiographic detection circuit, and the control circuit controls the plurality of switches to be turned on and off to realize the different connection manners.

Therefore, at different moments, the control circuit can switch on and off the switch object, so that the electrocardio information detection device can acquire three different signals in different connection modes.

According to the first aspect, or any one of the foregoing implementation manners of the first aspect, in a sixth possible implementation manner of the electrocardiographic information detecting device, the control circuit is configured to, when the interference signal in the first signal is weakened according to the second signal and the third signal, specifically, subtract a product of the second signal and a first weight and a product of the third signal and a second weight from the first signal in sequence to obtain the result.

In this way, the control circuit can adjust the influence of various factors on the second signal and the third signal through the weight value, so that the influence brought by the interference signal in the first signal is weakened with higher accuracy, and the accuracy of the processed first signal is further improved.

In a second aspect, an embodiment of the present application provides a wearable device, which includes the electrocardiographic information detection apparatus described in any one of the above.

According to this wearable equipment of this disclosed embodiment, can handle first signal, weaken interference signal to improve electrocardio information detection's the degree of accuracy, and easily dress and remove, convenience of customers uses.

According to a second aspect, in a first possible implementation of the wearable device, the electrodes of the first electrode group are located on a side of the wearable device that directly fits the human body when worn, and the electrodes of the second electrode group are located on a side of the wearable device that does not directly fit the human body when worn.

The detection object can start detection by enabling the body part to touch the electrode of the second electrode group on the side not directly attached to the human body, and can finish detection by enabling the body part to leave the electrode of the second electrode group on the side not directly attached to the human body, so that the start and the finish of detection can be controlled by the action of the body part of the detection object, and the mode that a user uses the wearable device to detect the electrocardio information is more convenient.

In a second possible implementation form of the wearable device according to the second aspect as such or according to the first possible implementation form of the second aspect, the wearable device comprises a smart watch, the first set of electrodes is located at a bottom of the smart watch, and the second set of electrodes is located at a top or side of the smart watch. Wherein the bottom can be directly attached to one side of the human body, and the top or the side is convenient for the other side of the human body to contact.

According to this intelligent wrist-watch of this disclosed embodiment, can obtain the first signal that is closer to ideal electrocardiosignal, improve detection accuracy to easily dress and remove, the user of being convenient for uses.

These and other aspects of the present application will be more readily apparent from the following description of the embodiment(s).

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application;

FIG. 1a is a block diagram of a prior art ECG detection circuit of a wearable device;

FIG. 1b is a schematic diagram illustrating an electrocardiographic information detection of a detection object in a power frequency magnetic field in the prior art;

FIG. 2a shows a schematic diagram of an electrocardiographic detection watch, according to the related art;

FIG. 2b illustrates a waveform of an electrocardiographic signal under the influence of baseline wander and noise;

fig. 3 is a schematic structural diagram of an electrocardiographic information detection device according to an embodiment of the present disclosure;

FIG. 4a shows a schematic diagram of one arrangement of a plurality of switches according to an embodiment of the present disclosure;

fig. 4b illustrates an example of a waveform of a first signal according to an embodiment of the present disclosure;

FIG. 4c illustrates an exemplary first connection of a switch according to an embodiment of the disclosure;

FIG. 4d illustrates another exemplary first connection of a switch according to an embodiment of the disclosure;

fig. 4e shows an example of a waveform of a second signal according to an embodiment of the present disclosure;

FIG. 4f illustrates an exemplary second connection of a switch according to embodiments of the present disclosure;

fig. 4g shows an example of a waveform of a third signal according to an embodiment of the present disclosure;

FIG. 4h illustrates an exemplary third connection of a switch according to embodiments of the present disclosure;

FIG. 5 shows a schematic diagram of another arrangement of a plurality of switches according to an embodiment of the present disclosure;

FIG. 6 shows a schematic diagram of another arrangement of a plurality of switches according to an embodiment of the present disclosure;

FIG. 7 shows a schematic diagram of another arrangement of a plurality of switches according to an embodiment of the present disclosure;

FIG. 8 shows a schematic diagram of another arrangement of a plurality of switches according to an embodiment of the present disclosure;

FIG. 9 shows a schematic diagram of another arrangement of a plurality of switches according to an embodiment of the present disclosure;

FIG. 10 shows a schematic diagram of another arrangement of a plurality of switches according to an embodiment of the present disclosure;

FIG. 11 shows a schematic diagram of another arrangement of a plurality of switches according to an embodiment of the present disclosure;

FIG. 12 shows a schematic diagram of another arrangement of a plurality of switches according to an embodiment of the disclosure;

FIG. 13 illustrates an exemplary application scenario of an embodiment of the present application;

fig. 14 shows a schematic structural diagram of a terminal device according to an embodiment of the present application.

Detailed Description

Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present application.

Fig. 1b shows a schematic diagram of performing electrocardiographic information detection on a detection object in a power frequency magnetic field in the prior art.

The action of the myocardial cells leads to the transmission and reflection of the potential change to the body surface, so that the waveform of the change of the potential difference between the two parts of the body surface can be recorded by placing the electrodes at any two non-equipotential parts of the body surface. The electrodes are respectively arranged on two sides of the heart, so that the change waveform of the electrocardiosignal can be recorded.

As shown in fig. 1b, the detection object is located in the power frequency magnetic field, and the topology of the electrocardiograph detection circuit according to the related art includes: the electrocardiosignal detection device comprises electrodes, a lead wire, an Instrument amplifier (INA), a Right leg driving circuit (RLD) and the like, wherein the electrodes are respectively placed at corresponding positions of a left arm, a Right arm and a Right leg of a detection object, and electrocardiosignals of a human body are collected from the body surface through the electrodes placed on the left arm and the Right arm.

In one possible implementation, the myocardial activity of the subject is detected such that an electrical signal is generated on the body surface, which can be collected by the electrodes in FIG. 1b and input to instrumentation amplifier INA via lead wires. The instrumentation amplifier INA may be an amplifier that differentially amplifies the input signal. As shown in fig. 1b, two input terminals of the instrumentation amplifier INA are connected to electrodes disposed on the left and right arms through lead wires, respectively, wherein the electrodes disposed on the left and right arms serve as movable electrodes, collect electrical signals on the surface of the left arm and electrical signals on the surface of the right arm, respectively, and input to the two input terminals of the instrumentation amplifier INA simultaneously. The instrumentation amplifier INA may amplify a differential-mode signal, which is a voltage difference between the two signals, and the differential-mode signal may be directly output to an Analog-to-digital converter (ADC) (not shown) at an output end of the instrumentation amplifier INA for processing, and finally converted into an electrocardiographic signal in a digital form and displayed.

A common-mode signal is also present between signals input to the two input ends of the instrumentation amplifier INA, and in order to improve the display effect of the electrocardiographic signals, it is necessary to eliminate interference caused by the common-mode signal as much as possible. The electrode placed on the right leg can be used as an irrelevant electrode, and common-mode voltage is reduced in electric signal acquisition to suppress common-mode interference. As shown in fig. 1b, the input terminal of the right leg drive circuit RLD is connected to the instrumentation amplifier INA, and the common mode voltage δ I between the two input signals of the instrumentation amplifier INA is obtained _CM The output end of the right leg driving circuit RLD is connected with an electrode arranged on the right leg through a protection resistor Rp and a lead wire, the right leg driving circuit RLD is essentially negative feedback, can reversely amplify a common-mode signal and transmits the signal back to the body surface through an irrelevant electrode, and the protection resistor Rp can be used for preventing overlarge current fed back to the human body. Because the direction of the common mode signal between the returned reverse common mode signal and the signal input to the two input ends of the instrumentation amplifier INA is opposite, the common mode signal between the two input ends of the instrumentation amplifier INA can be counteracted to realize the inhibition of the common mode signal, so that the signal output by the instrumentation amplifier INA is more accurate, and the finally obtained electrocardiosignal is more accurate.

Fig. 2a shows a schematic diagram of an electrocardiographic detection watch according to the related art. As shown in fig. 2a, the two electrodes (LA, RL) on the bottom of the watch correspond to the electrodes placed on the left arm and the right leg of the detection object in fig. 1b, respectively, and one electrode (RA) on the top of the watch corresponds to the electrode placed on the right arm of the detection object in fig. 1b, so that the watch can be worn on the left limb of the detection object, both electrodes on the bottom of the watch are in contact with the left limb, and the top electrode is also in contact with the right limb (for example, the right finger), so that the electrocardiographic detection watch can detect electrocardiographic information.

However, when the contact between the electrode and the skin is unstable, for example, due to some movement of the wearer during data acquisition and some shaking of the head or body, inaccurate electrocardiosignal tracks are caused, so that baseline drift occurs in the output signals of the electrocardio information detecting device when the waveforms are displayed; in addition, unstable contact between the electrode and the skin can cause different internal resistance of the detection position and the characteristic impedance of the connected lead wire, different phases can be caused, impedance mismatch is caused, and electromyographic signals also cause interference, so that larger high-frequency noise is introduced.

Figure 2b illustrates the waveform of the cardiac signal under the influence of baseline wander and noise. As shown in fig. 2b, the interference information unrelated to the electrocardiographic signal makes the output signal of the detection device have a large deviation from the ideal electrocardiographic signal, which is not favorable for the operations of signal display and subsequent analysis.

In order to solve the technical problem, the application provides an electrocardiograph information detection device, and the electrocardiograph information detection device of the embodiment of the application improves the accuracy of an output signal of the electrocardiograph information detection device by weakening the influence caused by an interference signal.

Fig. 3 shows a schematic structural diagram of an electrocardiographic information detection apparatus according to an embodiment of the present disclosure.

As shown in fig. 3, the electrocardiographic information detecting device includes a first electrode set, a second electrode set, an electrocardiographic detecting circuit 201 and a control circuit 202, wherein the electrocardiographic detecting circuit 201 includes a first electrocardiographic signal input terminal (ECGP terminal), a second electrocardiographic signal input terminal (ECGN terminal) and a right leg drive circuit output terminal (RLD terminal); the first electrode group includes a plurality of electrodes (e.g., including a first electrode E1, a second electrode E2) for acquiring electrical signals for a first body location, and the second electrode group includes a plurality of electrodes (e.g., including a third electrode E3 and a fourth electrode E4) for acquiring electrical signals for a second body location, the first body location and the second body location being located on respective sides of the heart.

The control circuit is used for controlling the electrodes (E1, E2) in the first electrode group and the electrodes (E3, E4) in the second electrode group to be connected with the first electrocardiogram signal input end (ECGP end), the second electrocardiogram signal input end (ECGN end) and the right leg drive circuit output end (RLD end) of the electrocardiogram detection circuit 201 in different connection modes, so that the electrocardiogram detection circuit outputs a first signal, a second signal and a third signal respectively in different connection modes, wherein the first signal is obtained by connecting the electrodes in the first electrode group with the first electrocardiogram signal input end (ECGP end), and connecting the electrodes in the second electrode group with the second electrocardiogram signal input end (ECGN end), and the first signal comprises an electrocardiogram signal and an interference signal; the second signal is obtained by connecting the electrodes in the first electrode group with a first electrocardiogram signal input end (ECGP end) and a second electrocardiogram signal input end (ECGN end) respectively; the third signal is obtained by connecting the electrodes in the second electrode group with the first electrocardiogram signal input end (ECGP end) and the second electrocardiogram signal input end (ECGN end) respectively; the control circuit is further configured to attenuate an interfering signal in the first signal based on the second signal and the third signal.

In the process of signal acquisition by contacting the electrode with the skin, besides the electric signal caused by the heart beat, other electric signals irrelevant to the electrocardio signal can be acquired, so that noise appears in the signal output by the electrocardio detection circuit; also, impedance mismatches caused by instability of the electrode-to-skin contact can also introduce noise. When the signal output by the electrocardiographic detection circuit is displayed in the form of an electrocardiographic waveform, the presence of noise interferes with the display effect of the electrocardiographic signal. In addition, factors such as human respiration and electrode movement can cause the baseline of the displayed electrocardiogram waveform to drift, and the display of the electrocardiogram signal can be interfered. In the embodiment of the present application, signals that are not related to the cardiac signal are collectively referred to as interference signals, and the interference signals may include signals generated by any other factors except electrical signals caused by cardiac pulsation, for example, noise signals, or interference signals formed by a portion where an actual baseline drifts relative to an ideal baseline in a baseline drift phenomenon, and the like.

In a possible implementation manner, the electrocardiograph detecting circuit 201 may be implemented based on the prior art, for example, as shown in fig. 1a and fig. 1b, which is not limited in this embodiment of the present application.

The electrodes in the first electrode group and the second electrode group are respectively contacted with different positions on two sides of the heart of the detection object, and correspondingly acquire electric signals of different positions of the body of the detection object, for example, the first electrode group can acquire the electric signals of one limb (for example, the left arm), the second electrode group can acquire the electric signals of the other limb (for example, the right arm), and various signals related to the acquisition of the electrocardiographic information of the detection object can be obtained by acquiring the electric signals of the limb on the same side and the electric signals of the limbs on different sides. When two electrodes (e.g., a first electrode and a third electrode) disposed on two sides of the heart are respectively connected to the first electrocardiogram signal input terminal ECGP and the second electrocardiogram signal input terminal ECGN of the electrocardiogram detection circuit 201, the electrocardiogram detection circuit 201 may output a first signal including an electrocardiogram signal and an interference signal, and when two electrodes (e.g., the first electrode and the second electrode, or the third electrode and the fourth electrode) disposed on the same side of the heart are respectively connected to the first electrocardiogram signal input terminal ECGP and the second electrocardiogram signal input terminal ECGN of the electrocardiogram detection circuit, the electrocardiogram detection circuit 201 may output a second signal and a third signal including an interference signal.

In one possible implementation, the electrodes used in generating the second signal include at least one electrode used in generating the first signal, and the electrodes used in generating the third signal include at least one electrode used in generating the first signal.

Thus, the first signal is generated from the electric signals detected at two different body positions and includes the electrocardiographic signal and an interference signal caused by baseline drift, noise, or the like and unrelated to the electrocardiographic signal, and the second signal and the third signal are generated from the electric signals detected at the same body position and include only the interference signal by the electrode at each body position. Because the electrode used for generating the second signal comprises at least one electrode used for generating the first signal, and the electrode used for generating the third signal comprises at least one electrode used for generating the first signal, the interference signal introduced by the electrode in the first signal can be weakened by the interference signal introduced by the corresponding electrode in the second signal and the third signal, and the accuracy of the processed first signal is improved.

According to the electrocardio information detection device disclosed by the embodiment of the disclosure, the first signal comprising the electrocardiosignal and the interference signal, the second signal and the third signal only comprising the interference signal can be acquired through the connection mode of the control electrode and the electrocardio detection circuit, the influence brought by the interference signal in the first signal can be weakened by utilizing the second signal and the third signal, and when the electrocardio information detection device is applied to terminal equipment, the first signal with less interference signal and closer to an ideal electrocardiosignal can be obtained, so that the display or analysis based on the first signal is more accurate.

In a possible implementation manner, the electrocardiographic information detection device according to the embodiment of the present application further includes a plurality of switches, the plurality of switches are connected among the first electrode group, the second electrode group, and the electrocardiographic detection circuit, and the control circuit implements different connection manners by controlling the plurality of switches to be turned on and off. Under different connection modes, the electrocardio detection circuit can obtain the first signal, the second signal and the third signal.

For example, the first electrode group may include a first electrode E1 and a second electrode E2, and the second electrode group may include a third electrode E3 and a fourth electrode E4. The first electrode E1 and the second electrode E2 may acquire electrical signals of the left limb of the test subject and the third electrode E3 and the fourth electrode E4 may acquire electrical signals of the right limb of the test subject, or the first electrode E1 and the second electrode E2 may acquire electrical signals of the right limb of the test subject and the third electrode E3 and the fourth electrode E4 may acquire electrical signals of the left limb of the test subject. The arrangement mode of the four electrodes can realize the scheme of the embodiment of the application by a simpler hardware structure. However, it should be understood by those skilled in the art that the number of electrodes in the first electrode group and the second electrode group is not limited by the embodiments of the present application, as long as the acquisition of the first signal, the second signal and the third signal can be achieved. Hereinafter, the first electrode E1, the second electrode E2, the third electrode E3, and the fourth electrode E4 are exemplified.

FIG. 4a shows a schematic diagram of one arrangement of a plurality of switches according to an embodiment of the present disclosure.

As shown in fig. 4a, the ecg information detecting apparatus can include a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a fifth switch S5 and a sixth switch S6, wherein one end of the first switch S1 is connected to the first electrode E1, the other end of the first switch S1 is connected to the first ecg signal input terminal ECGP of the ecg detecting circuit, one end of the second switch S2 is connected to the second electrode E2, the other end of the second switch S2 is connected to the second ecg signal input terminal ECGN of the ecg detecting circuit 201, one end of the third switch S3 is connected to the third electrode E3, the other end of the third switch S3 is connected to the second ecg signal input terminal ECGN of the ecg detecting circuit 201, one end of the fourth switch S4 is connected to the fourth electrode E4, the other end of the fourth switch S4 is connected to the first ecg signal input terminal ECGP of the detecting circuit 201, and one end of the fifth switch S5 is connected to the second electrode E2, the other end of the fifth switch S5 is connected to the right leg driving circuit output end RLD of the electrocardiograph detection circuit 201, one end of the sixth switch S6 is connected to the third electrode E3, and the other end of the sixth switch S6 is connected to the right leg driving circuit output end RLD of the electrocardiograph detection circuit 201.

In one possible implementation, the control circuit 202 may control the on and off of the switches, so that at the same time, corresponding electrodes are connected to the first electrocardiogram signal input terminal ECGP, the second electrocardiogram signal input terminal ECGN, and the right leg driving circuit output terminal RLD, respectively, to obtain one of the first signal, the second signal, or the third signal. Therefore, at different moments, the control circuit 202 can switch on and off the switch object, so that the electrocardiogram information detection device can acquire three different signals in different connection modes. The connection mode may be preset according to the setting mode of the switch, and the type of the signal obtained in the preset connection mode is determined, so that the control circuit 202 may obtain different signals by switching the connection mode.

In the following, an example of a possible connection and corresponding signals obtained in an arrangement of a plurality of switches as shown in fig. 4a is described.

In one possible implementation, the first electrode group includes a first electrode E1 and a second electrode E2, and the second electrode group includes a third electrode E3 and a fourth electrode E4; in the first connection mode, the control circuit 202 controls one of the first electrode E1 and the second electrode E2 to be connected to the first electrocardiogram signal input terminal ECGP of the electrocardiograph detection circuit 201, one of the third electrode E3 and the fourth electrode E4 to be connected to the second electrocardiogram signal input terminal ECGN of the electrocardiograph detection circuit 201, and the other of the first electrode E1 and the second electrode E2 or the other of the third electrode E3 and the fourth electrode E4 to be connected to the right leg drive circuit output terminal RLD of the electrocardiograph detection circuit 201, so that the electrocardiograph detection circuit 201 generates a first signal.

For example, the acquisition of the first signal can be realized by controlling the closing and opening of the switches to connect the electrodes and the electrocardiograph detection circuit 201 in the first connection mode.

In a possible implementation manner, one of the electrodes disposed on the left side of the limb and one of the electrodes disposed on the right side of the limb are respectively connected to the first electrocardiogram signal input terminal ECGP and the second electrocardiogram signal input terminal ECGN of the electrocardiogram detection circuit 201 to serve as active electrodes for acquiring electrical signals, and any one of the remaining two electrodes is connected to the right leg driving circuit output terminal RLD to serve as an irrelevant electrode, so that the electrocardiogram information detection device can complete the acquisition and processing of the electrical signals to obtain a first signal including the electrocardiogram signals and the interference signals. An example of the waveform of the first signal is shown in fig. 4 b.

In the case of the switch arrangement shown in fig. 4a, there are also a number of options for the first connection. As shown in fig. 4c, the first switch S1, the third switch S3, and the fifth switch S5 may be controlled to be closed, and the second switch S2, the fourth switch S4, and the sixth switch S6 may be controlled to be opened, so that the first connection mode is that the first electrode E1 and the third electrode E3 are respectively connected to the first electrocardiogram signal input terminal ECGP and the second electrocardiogram signal input terminal ECGN, and the second electrode E2 is connected to the right leg driving circuit output terminal RLD, at this time, the active electrodes completing the electrical signal collection are the first electrode E1 and the third electrode E3, and thus, interference signals caused by baseline wander, noise, and the like are also generated by the first electrode E1 and the third electrode E3, respectively.

Alternatively, as shown in fig. 4d, the second switch S2, the fourth switch S4 and the sixth switch S6 may be controlled to be closed, and the first switch S1, the third switch S3 and the fifth switch S5 may be controlled to be opened, so that the first connection mode is that the second electrode E2 and the fourth electrode E4 are respectively connected to the second electrocardiogram signal input terminal ECGN and the first electrocardiogram signal input terminal ECGP, and the third electrode E3 is connected to the right leg driving circuit output terminal RLD. At this time, the movable electrodes that perform the electrical signal acquisition are the second electrode E2 and the fourth electrode E4, and therefore, interference signals caused by baseline wander, noise, and the like are also generated by the second electrode E2 and the fourth electrode E4, respectively.

In a possible implementation manner, in other switch setting manners, the first electrode E1 may be connected to the second electrocardiogram signal input terminal ECGN, the third electrode E3 may be connected to the first electrocardiogram signal input terminal ECGP, and the second electrode E2 may be connected to the right leg driving circuit output terminal RLD to obtain the first signal, or the second electrode E2 may be connected to the first electrocardiogram signal input terminal ECGP, the fourth electrode E4 may be connected to the second electrocardiogram signal input terminal ECGN, and the third electrode E3 may be connected to the right leg driving circuit output terminal RLD to obtain the first signal. It will be understood by those skilled in the art that the electrode objects to which the ECGP and ECGN are respectively connected when acquiring the first signal may be different in different switch settings, and the disclosure is not limited thereto.

Therefore, in the first connection mode, the electrocardio detection circuit can process the acquired electric signal to obtain a first signal and transmit the first signal to the control circuit, so that when the control electrode of the control circuit is connected with the electrocardio detection circuit in the first connection mode, the first signal received by the control circuit can be determined.

In one possible implementation, the first electrode group includes a first electrode E1 and a second electrode E2, and the second electrode group includes a third electrode E3 and a fourth electrode E4; in the second connection mode, the control circuit 202 controls the first electrode E1 and the second electrode E2 to be connected to the first electrocardiogram signal input terminal ECGP and the second electrocardiogram signal input terminal ECGN, respectively, and controls one of the third electrode E3 and the fourth electrode E4 to be connected to the right leg driving circuit output terminal RLD, so that the electrocardiograph detecting circuit 201 generates a second signal.

For example, the acquisition of the second signal can be realized by controlling the closing and opening of the plurality of switches so that the electrode and the electrocardiograph detection circuit are connected in the second connection mode.

In a possible implementation manner, the two electrodes placed on the left limb are respectively connected to the first electrocardiogram signal input end ECGP and the second electrocardiogram signal input end ECGN of the electrocardiogram detection circuit 201 as active electrodes for signal acquisition, and any one of the two remaining electrodes placed on the right limb is connected to the right leg drive circuit output end RLD, so that when the two remaining electrodes are used as unrelated electrodes, the electrocardiogram information detection device can complete signal acquisition and processing, and obtain a second signal including baseline drift and noise. An example of the waveform of the second signal is shown in fig. 4 e.

In the case of the switch arrangement shown in fig. 4a, as shown in fig. 4f, the first switch S1, the second switch S2 and the sixth switch S6 can be controlled to be closed, and the third switch S3, the fourth switch S4 and the fifth switch S5 can be controlled to be opened, so that the second connection mode is that the first electrode E1 and the second electrode E2 are respectively connected to the first electrocardiogram signal input terminal ECGP and the second electrocardiogram signal input terminal ECGN, and the third electrode E3 is connected to the right leg driving circuit output terminal RLD. At this time, the movable electrodes that perform the electrical signal acquisition are the first electrode E1 and the second electrode E2, and therefore, interference signals caused by baseline drift, noise, and the like are also generated by the first electrode E1 and the second electrode E2, respectively.

In a possible implementation manner, in other switch setting manners, the first electrode E1 may be connected to the second electrocardiogram signal input terminal ECGN, the second electrode E2 is connected to the first electrocardiogram signal input terminal ECGP, and the third electrode E3 is connected to the right leg driving circuit output terminal RLD, so as to obtain the second signal. It will be understood by those skilled in the art that the electrode objects to which the ECGP and ECGN are respectively connected when acquiring the second signal may be different in different switch settings, and the disclosure is not limited thereto.

Therefore, in the second connection mode, the electrocardio detection circuit can process the acquired electric signal to obtain a second signal and transmit the second signal to the control circuit, so that the second signal received by the control circuit can be determined when the control electrode of the control circuit is connected with the electrocardio detection circuit in the second connection mode.

In one possible implementation, the first electrode group includes a first electrode E1 and a second electrode E2, and the second electrode group includes a third electrode E3 and a fourth electrode E4; in the third connection mode, the control circuit 202 controls the third electrode E3 and the fourth electrode E4 to be connected to the first electrocardiogram signal input terminal ECGP and the second electrocardiogram signal input terminal ECGN, respectively, and controls one of the first electrode E1 and the second electrode E2 to be connected to the right leg driving circuit output terminal RLD, so that the electrocardiogram detecting circuit 201 generates a third signal.

For example, the acquisition of the third signal may be achieved by controlling the on and off of the switches so that the electrode and the electrocardiograph detection circuit are connected in a third connection manner.

In a possible implementation manner, the two electrodes placed on the right limb are respectively connected to the first electrocardiogram signal input terminal ECGP and the second electrocardiogram signal input terminal ECGN of the electrocardiogram detection circuit 201 as active electrodes for signal acquisition, and any one of the two remaining electrodes placed on the left limb is connected to the right leg drive circuit output terminal RLD, and when the two remaining electrodes are used as unrelated electrodes, the electrocardiogram information detection device can complete signal acquisition and processing to obtain a third signal including an interference signal. An example of the waveform of the third signal is shown in fig. 4 g.

In the case of the switch arrangement shown in fig. 4a, as shown in fig. 4h, the third switch S3, the fourth switch S4 and the fifth switch S5 can be controlled to be closed, and the first switch S1, the second switch S2 and the sixth switch S6 can be controlled to be opened, so that the third connection mode is that the third electrode E3 and the fourth electrode E4 are respectively connected to the second ecg signal input terminal ECGN and the first ecg signal input terminal ECGP, and the second electrode E2 is connected to the right leg driving circuit output terminal RLD. At this time, the movable electrodes that perform the electrical signal acquisition are the third electrode E3 and the fourth electrode E4, and therefore, disturbance signals caused by baseline wander, noise, and the like are also generated by the third electrode E3 and the fourth electrode E4, respectively.

In a possible implementation manner, in other switch setting manners, the third electrode E3 may be connected to the first electrocardiogram signal input terminal ECGP, the fourth electrode E4 is connected to the second electrocardiogram signal input terminal ECGN, and the second electrode E2 is connected to the right leg driving circuit output terminal RLD, so as to obtain the third signal. It will be understood by those skilled in the art that the electrode objects to which ECGP and ECGN are respectively connected when acquiring the third signal may be different in different switch setting modes, and the disclosure is not limited thereto.

Through a third connection mode, an electric signal acquired by the electrodes in the second electrode group is input to the electrocardiogram detection circuit through the first electrocardiogram signal input end and the second electrocardiogram signal input end to generate a third signal, and meanwhile, one electrode in the first electrode group is connected with the output end of the right leg driving circuit of the electrocardiogram detection circuit to achieve common mode rejection.

Therefore, in the third connection mode, the electrocardio detection circuit can process the acquired electric signal to obtain a third signal and transmit the third signal to the control circuit, so that when the control electrode of the control circuit is connected with the electrocardio detection circuit in the third connection mode, the third signal received by the control circuit can be determined.

In a possible implementation manner, the electrocardiographic information detection device has a sampling frequency, and in a sampling interval from this sampling to next sampling, the acquired signal can be used for processing to obtain electrocardiographic information at the sampling moment. The acquisition of the first signal, the second signal and the third signal may be completed within one sampling interval.

For example, the control circuit 202 may preset a switching order of the connection modes so that the three kinds of signals can be acquired in turn. For example, the switching sequence of the connection modes may be preset as a first connection mode, a second connection mode, and a third connection mode, so that the control circuit 202 may control the plurality of switches to enable the electrode and the detection object to sequentially obtain the first signal, the second signal, and the third signal for completing the first processing in the sequence of the first connection mode, the second connection mode, and the third connection mode, and then repeat the sequence of the first connection mode, the second connection mode, and the third connection mode to obtain the first signal, the second signal, and the third signal for completing the second processing, and so on, the first signal with higher accuracy may be continuously obtained.

In a possible implementation manner, the electrocardiographic information detection device may further include a storage circuit, and when the control circuit receives the first signal, the second signal, or the third signal, the control circuit may store the received signal in the storage circuit. For example, when the switching order of the connection modes is the first connection mode, the second connection mode, and the third connection mode, the sequence of the signals received by the control circuit 202 may be the first signal, the second signal, and the third signal, and the sequence of the signals stored in the storage circuit may also be the first signal, the second signal, and the third signal. Thus, when the control circuit performs processing based on the signal stored in the storage circuit to obtain the first signal with higher accuracy, the control circuit can distinguish the plurality of signals stored in the storage circuit.

In a possible implementation manner, the control circuit 202 itself may also store the signals, and the storage sequence of the signals may be the same as that stored in the storage circuit, which may be referred to the above description and is not described herein again.

In a possible implementation manner, in the process that the control circuit 202 controls the switch to switch the connection modes, the time interval between two times of switching to the first connection mode, the time interval between two times of switching to the second connection mode, and the time interval between two times of switching to the third connection mode may be the same, so that the electrocardiographic information included in the first signal with higher accuracy obtained by the control circuit is regular in time, and thus the health condition of the detection object can be monitored and judged in real time based on the information such as the waveform of the first signal with higher accuracy.

It should be understood by those skilled in the art that the switching order of the connection modes should be different from the order described above, and for example, the switching order of the second connection mode-the first connection mode-the third connection mode may be also possible. The present disclosure does not limit the specific setting manner of the switching order of the connection manner as long as it can satisfy the requirement that three kinds of signals can be obtained in one sampling interval.

Due to uncertainty of the detection environment, the interference signal in the first signal is not identical to the interference signals in the second signal and the third signal, and therefore, when the interference signal in the first signal is subtracted based on the interference signals in the second signal and the third signal, the second signal and the third signal can be weighted to further improve the accuracy of the processed first signal.

In a possible implementation manner, the control circuit is configured to, when the interference signal in the first signal is attenuated according to the second signal and the third signal, specifically, subtract a product of the second signal and a first weight and a product of the third signal and a second weight from the first signal in sequence to obtain the interference signal.

For example, the control circuit 202 may process the first signal, the second signal, and the third signal based on the first weight and the second weight, so as to obtain the first signal with higher accuracy. The processing mode is shown in the formula (1),

S(x)＝S1-f(x)S2-y(x)S3 (1)

wherein, S (x) represents the processed first signal, S1 represents the first signal before processing, S2 represents the second signal, S3 represents the third signal, f (x) and y (x) represent the first weight and the second weight, respectively, and x is the influence factor of the weighting coefficient (the first weight and the second weight).

In one possible implementation, in the case that the first signal is obtained by the first connection shown in fig. 4c, the second signal is obtained by the second connection shown in fig. 4f, and the third signal is obtained by the third connection shown in fig. 4h, the first weight may be a proportion of the interference signal generated by the first electrode E1 in the second signal, and the second weight may be a proportion of the interference signal generated by the third electrode E3 in the third signal, so that a product of the second signal and the first weight may represent the interference signal generated by the first electrode E1, a product of the third signal and the second weight may represent the interference signal generated by the third electrode E3, and a difference is made between the first signal, a product of the second signal and the first weight, and a product of the third signal and the second weight, that is to eliminate the interference signal generated by the first electrode E1 and the third electrode E3, respectively, in the first signal, thereby obtaining a first signal which is closer to an ideal electrocardiosignal and has higher accuracy.

In one possible implementation, in the case that the first signal is obtained by the first connection shown in fig. 4d, the second signal is obtained by the second connection shown in fig. 4f, and the third signal is obtained by the third connection shown in fig. 4h, the first weight may be a proportion of the interference signal generated by the second electrode E2 in the second signal, and the second weight may be a proportion of the interference signal generated by the fourth electrode E4 in the third signal, so that a product of the second signal and the first weight may represent the interference signal generated by the second electrode E2, and a product of the third signal and the second weight may represent the interference signal generated by the fourth electrode E4, and a product of the first signal, the product of the second signal and the first weight, and a product of the third signal and the second weight may be differentiated, so that the interference signals generated by the second electrode E2 and the fourth electrode E4, respectively, in the first signal may be eliminated, thereby obtaining a first signal which is closer to an ideal electrocardiosignal and has higher accuracy.

As can be seen from the above description, the influence of many factors such as environment can be considered when determining the first weight and the second weight. The influence factors of the first weight and the second weight may be many, such as the stability of the contact between the electrodes in the first electrode group and the second electrode group and the skin at the first body position and the second body position, and the variable characteristics of the physical characteristics (such as the dryness of the skin) of the first body position and the second body position, and the influence factors may also include the constant physical characteristics of the area, shape, and material of the electrodes in the first electrode group and the second electrode group.

Under the condition that only invariant influence factors (such as the area, the shape, the materials and the like of an electrode) are considered, a first weight and a second weight which enable the accuracy of a first signal obtained after processing to be optimal can be found through simulation under a normal external environment (such as the electrocardio information detection device is static, and the skin humidity is kept moderate), and the two weights are fixedly used.

In the case of further considering a variable influence factor (e.g., the above stability, etc.), a corresponding relationship (e.g., a functional relationship) between the influence factor and the first weight and the second weight may be determined, and the corresponding relationship may be applied to determine different first weights and second weights for influence factors of different values.

For example, if considering the variable influence factor of the stability of the electrode in contact with the skin at the first body position, the second body position, and other constant influence factors, the stability can be characterized by the acceleration. For example, acceleration information of the electrocardiographic information detection device may be acquired by an acceleration sensor or the like, and a first weight and a second weight that optimize accuracy of a first signal obtained after processing under the acceleration are obtained through simulation, and the acceleration, the first weight, and the second weight are used as a set of fitting data. By changing the acceleration, a plurality of sets of fitting data are obtained, and then from these fitting data, a functional relationship between the first weight data and the acceleration and a functional relationship between the second weight data and the acceleration are obtained by fitting, which may be, for example, a nonlinear functional relationship. In this way, the first weight and the second weight may be adjusted in use in dependence on the acceleration value measured in real time. Generally, when the acceleration is larger, the contact stability is worse, the motion artifact is larger, and the required first weight value and the second weight value are different. In this case, a more suitable first weight and second weight may be determined for different acceleration values, so as to further improve the accuracy of the processed first signal. Since the first signal obtained after the processing is naturally influenced by the unchanged influence factors such as the physical characteristics of the electrode in the simulation process, the effect of the two changeable and unchangeable influence factors is actually considered in the mode.

The first weight and the second weight can also be obtained by pre-training a neural network model capable of predicting the weights according to the signal prediction obtained by the electrocardio detection circuit when the electrocardio information detection device is used.

It will be appreciated by those skilled in the art that the switch arrangements that can satisfy the first, second and third connection arrangements described above should be more than the switch arrangement shown in fig. 4 a.

In a possible implementation manner, in the arrangement manner of the switches shown in fig. 4a, the switches connected to the first electrode and the second electrode may be interchanged, and the switches connected to the third electrode and the fourth electrode may also be interchanged.

For example, one end of the first switch S1 may be connected to the first electrode E1, the other end of the first switch S1 may be connected to the second electrocardiogram signal input terminal, and one end of the second switch S2 may be connected to the second electrode E2, and the other end of the second switch S2 may be connected to the first electrocardiogram signal input terminal, so that the connection manner of the remaining switches may be maintained, the electrical signal collected by the first electrode E1 may be input to the second electrocardiogram signal input terminal, and the electrical signal collected by the second electrode E2 may be input to the first electrocardiogram signal input terminal; one end of the third switch S3 may be connected to the third electrode E3, the other end of the third switch S3 is connected to the first electrocardiogram signal input end, and meanwhile, one end of the fourth switch S4 is connected to the fourth electrode E4, and the other end of the fourth switch S4 is connected to the second electrocardiogram signal input end, so that the connection manner of the remaining switches is maintained unchanged, so that the electrical signal acquired by the third electrode E3 can be input to the first electrocardiogram signal input end, and the electrical signal acquired by the fourth electrode E4 can be input to the second electrocardiogram signal input end.

In one possible implementation, as shown in fig. 5, one end of the fifth switch S5 may be changed from the second electrode E2 to be connected to the first electrode E1, and the remaining switches may be arranged in the same manner as in fig. 4a, or, as shown in fig. 6, one end of the sixth switch S6 may be changed from the third electrode E3 to be connected to the fourth electrode E4, and the connection manner of the remaining switches may be maintained, or, as shown in fig. 7, one end of the fifth switch S5 may be changed from the second electrode E2 to be connected to the first electrode E1, one end of the sixth switch S6 may be changed from the third electrode E3 to the fourth electrode E4, and the connection manner of the remaining switches may be maintained, and in the various switch arrangement manners shown in fig. 5 to 7, the first connection manner, the second connection manner, and the third connection manner corresponding to different switch arrangement manners may be preset, and those skilled in the art should understand that, as long as the acquisition of the first signal, the second signal and the third signal can be satisfied, the acquisition process of the signals has been described above, and is not described herein again for brevity.

In one possible implementation, more switches may be added between the electrodes and the ecg detecting circuit 201, as shown in fig. 8, so that the right leg driving circuit output RLD is connected to the first electrode E1, the second electrode E2 and the fourth electrode E4 through the fifth switch S5, the seventh switch S7 and the sixth switch S6, respectively, so that the rest of the switches are arranged in the same manner as in fig. 4a, or, as shown in fig. 9, so that the right leg driving circuit output RLD is connected to the first electrode E1, the second electrode E2 and the third electrode E3 through the fifth switch S5, the seventh switch S7 and the sixth switch S6, respectively, so that the rest of the switches are arranged in the same manner as in fig. 4a, or, as shown in fig. 10, so that the right leg driving circuit output RLD is connected to the first electrode E6, the third electrode E3 and the fourth electrode E4 through the fifth switch S5, the seventh switch S7 and the sixth switch S6, respectively, so that the rest of the switches are arranged in the same manner as in fig. 4a, alternatively, as shown in fig. 11, the right leg driving circuit output end RLD is connected to the second electrode E2, the third electrode E3 and the fourth electrode E4 through the fifth switch S5, the seventh switch S7 and the sixth switch S6, respectively, and the arrangement of the remaining switches is the same as that of fig. 4a, or, as shown in fig. 12, the right leg driving circuit output end RLD is connected to the first electrode E1, the second electrode E2, the third electrode E3 and the fourth electrode E4 through the fifth switch S5, the seventh switch S7, the sixth switch S6 and the eighth switch S8, respectively, and the arrangement of the remaining switches is the same as that of fig. 4 a. Because the switches connected with the output end RLD of the right leg driving circuit are more, the possible selection of the connection mode is more diversified, and thus, even if the switches have faults, for example, when one switch is closed but is not successfully closed when the first signal is collected, the first signal is collected by other selection of the first connection mode, so that the fault tolerance of the electrocardio information detection device is higher.

In practical application, the number of the switches can be selected as required, the scheme of selecting six switches can save hardware cost, the scheme of selecting more than six switches can improve the fault tolerance of the electrocardiogram information detection device, and the like, and the method is not limited by the disclosure.

The embodiment of the application further provides a wearable device, which comprises the electrocardio information detection device according to the embodiment of the application.

For example, the wearable device in the embodiment of the present application may be a ring-shaped device worn on an arm, such as a smart watch, or may also be a device that facilitates detecting a clothing style worn by a subject, which is not limited by the present disclosure.

In one possible implementation, the electrodes of the first electrode group are located on a side of the wearable device that directly fits the human body when worn, and the electrodes of the second electrode group are located on a side of the wearable device that does not directly fit the human body when worn.

For example, taking the example that the first electrode group includes the first electrode E1 and the second electrode E2, the second electrode group includes the third electrode E3 and the fourth electrode E4, and the first electrode E1 and the second electrode E2 are directly attached to the human body, the detection of the electrocardiographic information can be started by touching the body part with the third electrode E3 and the fourth electrode E4 which are not directly attached to the human body, and the detection of the electrocardiographic information can be ended by separating the body part from the third electrode E3 and the fourth electrode E4 which are not directly attached to the human body, so that the start and the end of the detection can be controlled by the motion of the body part of the detection object, and the way of performing electrocardiographic information detection by using the wearable device by the user is more convenient.

In one possible implementation, the wearable device includes a smart watch, the first set of electrodes is located at a bottom of the smart watch, and the second set of electrodes is located at a top or side of the smart watch.

For example, the wearable device according to the embodiment of the application can be a smart watch, the first electrode group can be located at the bottom of the watch and attached to a wrist on one side when worn, the second electrode group can be located at the side or the top of the watch and not directly attached to a human body when worn, and the other side of the wearable device can be conveniently touched by a finger. The smart watch may include the electrocardiographic information detection device in the embodiment of the present application, and may further include a communication circuit, a display circuit, and other sensors, where the communication circuit may be configured to send the first signal, the second signal, the third signal, and the like to other devices, the display circuit may be configured to display a waveform diagram formed by the first signal after the interference signal is weakened, and the other sensors may be configured to collect other physiological data of the detection object, such as temperature, and the like.

Fig. 13 illustrates an exemplary application scenario of an embodiment of the present application. As shown in fig. 13, the application scenario includes: the detection object 101 and the terminal device 102, wherein the terminal device 102 may be a smart watch, the exterior of the terminal device 102 may include a first electrode E1 and a second electrode E2 disposed at the bottom of the device and directly contacting with the wrist of the detection object, and a third electrode E3 and a fourth electrode E4 disposed at the right side of the device and not directly contacting with the detection object, and a display circuit (e.g., a screen) having a multimedia data display function, and the interior of the terminal device may include the electrocardiographic detection circuit, the control circuit, the storage circuit, the communication circuit, and a plurality of switches and the like (not shown in the figure) according to the embodiment of the present application.

In one possible implementation, the first electrode E1, the second electrode E2, the third electrode E3 and the fourth electrode E4 are all dry electrodes and can be used as sensors to collect electrical signals from the skin surface, wherein the first electrode E1 and the second electrode E2 can be symmetric semicircular rings, and the third electrode E3 and the fourth electrode E4 can be adjacent coronal electrodes. The present disclosure is not limited to a particular shape of the electrode.

In one possible implementation manner, when the terminal device 102 is worn by the detection object 101, and the left wrist portion of the detection object 101 is in contact with the first electrode E1 and the second electrode E2, respectively, and the right hand is in contact with the third electrode E3 and the fourth electrode E4, respectively, the terminal device 102 may directly process the acquired electrical signals, obtain a first signal closer to an ideal electrocardiographic signal and display the first signal on a screen, so that the electrocardiographic waveform of the detection object can be seen, and the health condition of the detection object can be analyzed according to the displayed signal waveform, and the like.

In a possible implementation manner, output signals (e.g., the first signal, the second signal, and the third signal) of the electrocardiograph detection circuit obtained according to the acquired electrical signals may also be forwarded by the terminal device 102, and processed by other terminal devices (not shown in the figure) that receive the signals, where the other terminal devices may also include the control circuit in the embodiment of the present application. The other terminal devices can process the first signal with improved accuracy, transmit the processed first signal back to the terminal device 102, and display the processed first signal on the screen of the terminal device 102; the processed first signal may also be displayed by other terminal devices (not shown in the figure) capable of receiving and displaying the first signal. The present disclosure does not limit the specific manner in which the first signal is displayed.

Fig. 14 shows a schematic structural diagram of a terminal device according to an embodiment of the present application. Fig. 14 shows a schematic configuration diagram of the terminal device 10.

It can be understood that the embodiment of the present application is described by taking a smart watch as an example, but is not limited to the smart watch, and may also be other terminal devices. The terminal device may be a device such as a smart bracelet including an Electrocardiogram (ECG) device, glasses including an ECG device, a head-mounted electronic device, goggles, or the like, or a smart phone including an ECG device, a Personal Digital Assistant (PDA), a notebook computer, or the like, which is not limited in the following embodiments of the present application.

As shown in fig. 14, the terminal device 10 may include: a processor 101A, a memory 102A, a communication circuit 103A, an antenna 104A, an ECG device 105A, a display screen 107A. Wherein:

the processor 101A may be used to read and execute computer readable instructions. In a specific implementation, the processor 101A may mainly include a controller, an operator, and a register. The controller is mainly responsible for instruction decoding and sending out control signals for operations corresponding to the instructions. The arithmetic unit is mainly responsible for storing register operands, intermediate operation results and the like temporarily stored in the instruction execution process. In a specific implementation, the hardware architecture of the processor 101A may be an Application Specific Integrated Circuit (ASIC) architecture, a MIPS architecture, an ARM architecture, or an NP architecture, etc. Wherein the processor may implement the functions of the control circuit 202 described above.

In some embodiments, the processor 101A may be configured to interpret signals received by the communication circuit 103A.

The memory 102A is coupled to the processor 101A for storing various software programs and/or sets of instructions. In particular implementations, the memory 102A may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid-state storage devices. The memory 102A may store an operating system, such as an embedded operating system like uCOS, VxWorks, RTLinux, etc. The memory 102A may also store a communication program that may be used to communicate with other devices.

The communication circuit 103A may provide a solution for wireless communication applied on the terminal device 10, including WLAN (e.g., Wi-Fi network), BR/EDR, BLE, GNSS, FM, etc.

In other embodiments, the communication circuit 103A may also transmit signals so that other devices may discover the terminal device 10.

The wireless communication function of the terminal device 10 can be realized by the antenna 104A, the communication circuit 103A, the modem processor, and the like.

The antenna 104A may be used to transmit and receive electromagnetic wave signals. Each antenna in terminal equipment 10 may be used to cover a single or multiple communication bands.

There may be one or more antennas of the communication circuit 103A in some embodiments.

The ECG device 105A may be used to acquire electrocardiographically varying data of the user. The ECG device 105A may comprise ECG device electrodes, such as the first electrode set and the second electrode set in the present embodiment, for contacting the wrist skin to acquire an electrical signal related to an electrocardiogram, and the ECG device may further comprise a data processing unit, such as the electrocardiograph detection circuit 201 in the present embodiment, for processing the signal acquired by the ECG device electrodes. The ECG device electrodes may be embedded in the terminal device 10 housing (e.g., the first electrode group and the second electrode group may be embedded in the housing), and the data processing unit may be disposed inside the terminal device 10 (e.g., the electrocardiograph detection circuit 201 may be disposed inside the terminal device 10).

The terminal device 10 may also include a display screen 107A, wherein the display screen 107A may be used to display images, prompts, etc. The display screen may be a Liquid Crystal Display (LCD), an organic light-emitting diode (OLED) display screen, an active-matrix organic light-emitting diode (AMOLED) display screen, a flexible light-emitting diode (FLED) display screen, a quantum dot light-emitting diode (QLED) display screen, or the like.

The terminal device may be a smart watch, not limited to a smart watch, but in some embodiments, the terminal device may also be a smart bracelet containing an ECG device, glasses, a head-mounted electronic device, goggles, a smartphone, a PDA, a laptop computer, or the like. In some embodiments, the terminal device may further include a serial interface such as an RS-232 interface. The serial interface can be connected to other devices, such as audio playing devices like intelligent sound boxes, so that the terminal device and the audio playing devices can play audio and video cooperatively.

It is to be understood that the structure illustrated in fig. 14 does not constitute a specific limitation to the terminal device 10. In other embodiments of the present application, a terminal device may include more or fewer components than shown, or some components may be combined, some components may be split, or a different arrangement of components may be used. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a circuit, segment, or portion of an instruction, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.

It is also noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by hardware (e.g., a Circuit or an ASIC) for performing the corresponding function or action, or by combinations of hardware and software, such as firmware.

While the invention has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An electrocardiographic information detection device characterized by comprising: the electrocardiogram detection circuit comprises a first electrode group, a second electrode group, an electrocardiogram signal input end, a second electrocardiogram signal input end and a right leg driving circuit output end;

the control circuit is used for controlling the electrodes in the first electrode group and the electrodes in the second electrode group to be connected with the first electrocardiogram signal input end, the second electrocardiogram signal input end and the right leg driving circuit output end in different connection modes, so that the electrocardiogram detection circuit outputs a first signal, a second signal and a third signal respectively in different connection modes, wherein the first signal is obtained by connecting the electrodes in the first electrode group with the first electrocardiogram signal input end and connecting the electrodes in the second electrode group with the second electrocardiogram signal input end, and the first signal comprises an electrocardiogram signal and an interference signal; the second signal is obtained by connecting the electrodes in the first electrode group with the first electrocardiogram signal input end and the second electrocardiogram signal input end respectively; the third signal is obtained by connecting electrodes in the second electrode group to the first electrocardiogram signal input end and the second electrocardiogram signal input end respectively;

the control circuit is further configured to attenuate the interfering signal in the first signal based on the second signal and the third signal.

2. The electrocardiographic information detection device according to claim 1, wherein:

the electrodes used in generating the second signal include at least one electrode used in generating the first signal, and the electrodes used in generating the third signal include at least one electrode used in generating the first signal.

3. The electrocardiographic information detection device according to claim 2, wherein:

the first electrode group comprises a first electrode and a second electrode, and the second electrode group comprises a third electrode and a fourth electrode;

the control circuit controls one of the first electrode and the second electrode to be connected with the first electrocardiogram signal input end, one of the third electrode and the fourth electrode to be connected with the second electrocardiogram signal input end, and the other of the first electrode and the second electrode or the other of the third electrode and the fourth electrode to be connected with the right leg driving circuit output end in a first connection mode, so that the electrocardiogram detecting circuit generates the first signal.

4. The electrocardiographic information detection device according to claim 2 or 3, characterized in that:

and the control circuit controls the first electrode and the second electrode to be respectively connected with the first electrocardiogram signal input end and the second electrocardiogram signal input end in a second connection mode, and controls one of the third electrode and the fourth electrode to be connected with the output end of the right leg driving circuit, so that the electrocardiogram detecting circuit generates the second signal.

5. The electrocardiographic information detecting device according to any one of claims 2 to 4, wherein:

and the control circuit controls the third electrode and the fourth electrode to be respectively connected with the first electrocardiogram signal input end and the second electrocardiogram signal input end in a third connection mode, and controls one of the first electrode and the second electrode to be connected with the output end of the right leg driving circuit, so that the electrocardiogram detecting circuit generates the third signal.

6. The apparatus according to any one of claims 1-5, further comprising a plurality of switches connected between said first electrode set, said second electrode set and said ECG detection circuit, wherein said control circuit controls said plurality of switches to be turned on and off to achieve said different connection modes.

7. The electrocardiographic information detecting device according to any one of claims 1 to 6, wherein:

the control circuit is configured to, when the interference signal in the first signal is attenuated according to the second signal and the third signal, specifically, sequentially subtract a product of the second signal and a first weight and a product of the third signal and a second weight from the first signal to obtain the interference signal.

8. A wearable device, characterized in that it comprises the electrocardiogram information detection apparatus of any one of claims 1-7.

9. The wearable device of claim 8, wherein the electrodes of the first electrode set are located on a side of the wearable device that directly conforms to a human body when worn, and wherein the electrodes of the second electrode set are located on a side of the wearable device that does not directly conform to a human body when worn.

10. The wearable device of claim 8 or 9, wherein the wearable device comprises a smart watch,

the first electrode group is located at the bottom of the smart watch, and the second electrode group is located at the top or the side of the smart watch.