WO2018129718A1 - Device and method for use in detecting electrocardio signals - Google Patents

Abstract

A device (10) and a method for use in detecting electrocardio signals, the device comprising: an arm band (102), the arm band comprising a fabric electrode (1022) and a button (1024), which is connected to the fabric electrode (1022), wherein the fabric electrode (1022) is used for detecting an electrocardio signal; a filter amplifier (104), which is connected to the arm band (102) by means of the button (1024) and which is used for obtaining the electrocardio signal, and amplifying and filtering the electrocardio signal to obtain an electrocardio analog signal; and a single-chip microcomputer (106), which is connected to the filter amplifier (104) and which is used for obtaining the electrocardio analog signal, and converting the electrocardio analog signal into an electrocardio digital signal by means of an analog-digital converter (1062). Using said device (10) and method for detecting electrocardio signals may improve the convenience of operation and the accuracy of the detection device.

Description

ECG signal detecting device and method Technical field

The invention relates to the field of medical electronic circuits, and mainly relates to an apparatus and method for detecting electrocardiogram signals.

Background technique

With the rapid pace of people's life, work pressure, population aging, environmental degradation and other factors, cardiovascular disease is increasingly becoming one of the major diseases that seriously threaten human health. The normal electrocardiogram includes P wave, QRS wave group and T wave. By analyzing each waveform, it can effectively diagnose major diseases such as myocardial infarction and arrhythmia, and greatly improve the survival rate of patients. According to medical evidence, early heart disease manifests as abnormal ECG signal. If it is found in time, it will help prevent cardiovascular disease and reduce mortality. Therefore, monitoring ECG signals becomes more important.

At present, the existing dynamic movable electrocardiograph uses a wet electrode and a plurality of lead wire conduction detection methods, which are not only bulky, but also heavy in quality, and the connection method needs to place electrodes at specific positions of the human body, and the professionalism is extremely high, Adapt to the general population in the family alone. The wet electrode can cause skin irritation and cause damage to the human body. The long lead wire has a certain interference to the ECG signal. Moreover, the number of operational amplifiers for processing ECG signals is too large, causing the board to be too large, and the more the number of operational amplifier stages, the more likely the operating amplifiers are self-oscillated, introducing large noise. Known wearable ECG testing devices are based on sensors in the chest area, such as straps, bandages, belts, etc., which are difficult to bring to the user with comfortable and convenient application requirements due to wearing on the chest. Another method for wearable ECG detection equipment is shown in Figure 1. The fingertips of the left and right hands of the human body collect ECG detection. The implementation of the principle is based on the proportional relationship between the magnitude of the ECG signal and the distance between the electrodes. Inconvenient convenience. This requires the detection device to be small, convenient, and comfortable, which does not affect the normal life of the user, and can perform real-time monitoring for a long time.

Summary of the invention

Based on this, in order to solve the technical problems caused by the use of wet electrodes, lead wires and multi-stage operational amplifiers in the conventional technology, such as complicated use, discomfort and signal interference, the electrocardiographic signal detecting device is proposed. .

A first aspect of the present invention provides an apparatus for detecting an electrocardiogram, the apparatus comprising:

An armband comprising a fabric electrode and a button connected to the fabric electrode, the fabric electrode for detecting an electrocardiographic signal;

And a filter amplifier connected to the armband through the button, configured to acquire the ECG signal, and amplify and filter the ECG signal to obtain an ECG analog signal;

And a single chip connected to the filter amplifier, configured to acquire the ECG analog signal, and convert the ECG analog signal into an ECG digital signal through an analog to digital converter.

In a first possible implementation manner of the first aspect, the filter amplifier includes: a first RC low-pass filter connected to the button, configured to acquire the ECG signal with a frequency lower than a first cutoff frequency a first high-pass filter amplifier connected to the first RC low-pass filter for acquiring the first signal having a frequency higher than a second cutoff frequency, and performing the acquired first signal Enlarging to obtain a second signal; a second high-pass filter amplifier connected to the first high-pass filter amplifier, configured to acquire the second signal having a frequency higher than a third cut-off frequency, and amplifying the acquired second signal Obtaining a third signal; a second RC low-pass filter connected to the second high-pass filter amplifier and having an output connected to the single chip, and configured to acquire the third signal having a frequency lower than a fourth cutoff frequency The ECG analog signal.

In a second possible implementation manner of the first aspect, the single-chip computer further includes a storage unit, configured to perform storage and data analysis on the ECG digital signal.

In a third possible implementation manner of the first aspect, the single-chip computer further includes a wireless transceiver, configured to send the ECG signal waveform to a mobile device that is wirelessly connected to the wireless transceiver.

In a fourth possible implementation manner of the first aspect, the MCU further includes a USB interface, configured to send the ECG signal waveform to a host computer connected to the USB interface through a USB cable.

In addition, in order to solve the technical problems caused by the complicated use, discomfort and signal interference caused by the use of wet electrodes, lead wires and multi-stage operational amplifiers in the conventional technology, an electrocardiographic signal detection method is proposed.

A second aspect of the present invention provides a method for detecting an electrocardiogram signal, including:

After the armband is attached to the human limb, the ECG signal is detected by the fabric electrode of the armband;

The filter amplifier acquires the electrocardiographic signal, and the electrocardiographic signal is amplified and filtered to obtain an electrocardiogram Analog signal

The single-chip computer obtains the ECG analog signal, and converts the ECG analog signal into an ECG digital signal through an analog-to-digital converter.

In a first possible implementation manner of the second aspect, the filtering amplifier amplifying and filtering the ECG signal to obtain an ECG analog signal further includes: the first RC low-pass filter acquires a frequency lower than the first cutoff The first electrical signal of the frequency is used as the first signal; the first high-pass filter amplifier acquires the first signal having a higher frequency than the second cutoff frequency, and amplifies the acquired first signal to obtain a second signal; The high-pass filter amplifier acquires the second signal having a frequency higher than the third cutoff frequency, and amplifies the acquired second signal to obtain a third signal; and the second RC low-pass filter obtains a frequency lower than the fourth cutoff frequency The third signal is used as the electrocardiographic analog signal.

In a second possible implementation manner of the second aspect, after the MCU acquires the analog-to-digital conversion of the ECG analog signal into an ECG digital signal, the method further includes: the storage unit stores the ECG digital signal and data analysis.

In a third possible implementation manner of the second aspect, after the MCU acquires the analog-to-digital conversion of the ECG analog signal into an ECG digital signal, the method further includes: sending, by the wireless transceiver, the waveform of the ECG signal to A mobile device that is wirelessly connected to the wireless transceiver.

In a fourth possible implementation manner of the second aspect, after the MCU acquires the analog-to-digital conversion of the ECG analog signal into an ECG digital signal, the method further includes: sending, by the USB interface, the waveform of the ECG signal to The USB interface is connected to the host computer through a USB cable.

Implementation of the embodiments of the present invention will have the following beneficial effects:

After the above-mentioned electrocardiographic signal detecting device and method are adopted, since the electrocardiographic signal is detected by the fabric electrode of the armband in close contact with the human body, the conventional wet electrode is not required to be bonded between the electrode and the human body, and the utilization rate is high; The lead wires are connected directly through the buttons in the arm band, which reduces the cost and the signal interference caused by the lead wires, and is comfortable to wear; the high-precision filter amplifier ensures the ECG signal acquisition. Accuracy. Under the premise of not disturbing the normal life of the user, the patient's electrocardiogram can be monitored dynamically for a long time, and the heart disease such as arrhythmia can be found in time and effectively, so that the patient can conveniently detect the ECG signal in real time and improve the convenience of operation. Sex and detection equipment accuracy.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

among them:

1 is a schematic diagram of a scene of a conventional smart bracelet ECG detecting device;

2 is a schematic diagram of a scenario of an ECG signal detecting device according to an embodiment of the present invention;

3 is a structural diagram of an ECG signal detecting apparatus according to an embodiment of the present invention;

4 is a structural diagram of an armband according to an embodiment of the present invention;

FIG. 5 is a circuit diagram of a filter amplifier according to an embodiment of the present invention;

6 is an experimental waveform diagram obtained by using an electrocardiographic signal detecting device according to an embodiment of the present invention;

FIG. 7 is a flowchart of a method for detecting an electrocardiogram according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In order to solve the technical problem that the use of wet electrodes, lead wires and multi-stage operational amplifiers in the conventional technology is complicated, wear discomfort and signal interference are low, in one embodiment, an electrocardiogram is proposed. Signal detection equipment. As shown in FIG. 2, the ECG signal detecting device is worn on the upper limb of the user by using an armband, and does not need to be measured by two hands like a conventional electrocardiographic collecting device, and only needs to be tied to a single arm to realize ECG signal detection, and is comfortable to wear. Convenience.

Specifically, as shown in FIG. 3, an ECG signal detecting apparatus includes: an armband 102, and the The armband 102 is connected through a filter amplifier 104 connected by a button 1024 and a single chip microcomputer 106 connected to the filter amplifier 104, wherein:

The armband 102 includes a fabric electrode 1022 and a button 1024 coupled to the fabric electrode 1022 for detecting an electrocardiographic signal.

Fabric electrode is a kind of flexible dry electrode which has developed rapidly in recent years. It is a sensor with textile structure developed by textile processing technology and capable of sensing bioelectrical signals on human body surface. The fabric electrode 1022 is used in the armband 102 for health monitoring, and the comfort of the garment is not affected, and the user does not have the psychological burden of being monitored, which solves the skin allergy caused by the dry electrode in the conventional technology and does not wear. Comfortable and other problems, even the electrode sheet caused by sweat soaking, affecting the accuracy of ECG measurement.

The fabric electrode 1022 is in contact with human skin as the foremost input to the ECG signal. As shown in the arm band structure diagram shown in FIG. 4, the arm band 102 is divided into the inner side of the arm band and the outer side of the arm band, and includes a fabric electrode 1022, a button 1024, a velcro 1026, and a sponge 1028.

Among them, the elasticity of the arm band 102 is adjusted by the inner side of the arm band and the velcro 1026 at the outer ends of the arm band, the position of the arm band 102 is fixed, and the wearing comfort is improved. The sponge 1028 is placed on the bottom layer of the button 1024 to avoid the problem of wearing discomfort caused by the button 1024 protrusion.

The fabric electrode 1022 is in contact with human skin and is connected to the two buttons 1024 on the outside of the arm band on the inner side of the arm band as the foremost input of the electrocardiographic signal. By adopting the above wearing and connecting method, instead of the ECG collecting method of the lead wire and the wet electrode, the arm band 102 is attached to the upper limb of the human body through the Velcro 1026, and the fabric electrode 1022 only needs to be associated with the button 1024 on the arm band 102. Connect, you can collect ECG signals. Moreover, there is no wire connection in the whole ECG signal detecting device, which is beneficial to equipment disassembly and people wearing, and effectively avoids the introduction of noise from the wire into the system.

In this embodiment, the filter amplifier 104 is configured to acquire the ECG signal, and amplify and filter the ECG signal to obtain an ECG analog signal.

The output of the armband 102 transmits the ECG signal detected by the fabric electrode 1022 to the filter amplifier 104 via the button 1024. That is, the signal received at the input of the filter amplifier 104 is the ECG signal detected by the fabric electrode 1022 described above.

However, since the ECG acquisition position is located farther from the heart and the distance between the collection electrodes is small, the unilateral arm has a small ECG amplitude and is susceptible to noise interference (electrodes, muscle movement). Table 1 shows the one-arm Comparison of features between detecting ECG signals and detecting ECG signals by conventional methods.

Table 1 Comparison of signal characteristics between single-arm ECG and traditional ECG

	Single arm ECG detection	Traditional ECG detection
Amplitude	<200uV	<5mV
Noise interference	Big	small

It can be seen from Table 1 that the amplitude of the ECG signal obtained by the single-arm ECG detection is small, and the noise interference is large, and the ECG signal detected by the fabric electrode 1022 necessarily has noise interference and a weak signal. In order to improve the accuracy of the ECG signal, it is necessary to amplify the weaker signal and filter the interference noise to obtain an ECG analog signal with large amplitude and less interference noise.

As shown in the circuit diagram of the filter amplifier 104 shown in FIG. 5, the circuit includes: a first RC low-pass filter 1042 connected to the button at the input end, and a first high-pass connected to the first RC low-pass filter 1042 at the input end. a filter amplifier 1044, a second high-pass filter amplifier 1046 whose input terminal is connected to the first high-pass filter amplifier 1044, a second RC low-pass connected to the input terminal and the low-pass filter amplifier 1046, and an output terminal connected to the single-chip microcomputer 106. A filter 1048 and a power supply module 1045 that provides power to the first high pass filter amplifier 1044 and the second high pass filter amplifier 1046, wherein:

The first RC low pass filter 1042 is configured to obtain the ECG signal whose frequency is lower than the first cutoff frequency as the first signal.

The first RC low pass filter 1042 includes limb leads LA and RA, resistors R1 and R2, and capacitors C1 and C2. The input end of the resistor R1 is connected to the limb lead LA, the output terminal is connected in parallel with the capacitor C1 and the anode of the instrumentation amplifier, the input end of the resistor R2 is connected to the limb lead RA, the output terminal is connected in parallel with the capacitor C2 and the cathode of the instrumentation amplifier, and the ends of the capacitors C1 and C2 are grounded. .

In the terminology of electrocardiogram, the placement of the electrode on the body surface and the connection of the electrode to the amplifier when the electrocardiogram is recorded are referred to as the lead of the electrocardiogram. At present, six limb leads and six chest leads are widely used internationally, and the placements of limbs LA and RA are left and right arms, respectively. The invention adopts a single channel input mode, that is, the arm band 102 is worn on the left arm or the right arm, which improves the convenience of operation.

The input signal passes through a first RC low pass filter 1042 consisting of resistors R1 and R2, capacitors C1 and C2, and has a filtered cutoff frequency of approximately 796 Hz. That is, the ECG signal detected by the fabric electrode 1022 is transmitted through the button 1024 as an input signal of the first RC low-pass filter 1042, and the frequency is low. The ECG signal at 796 Hz is the first signal.

In one embodiment, the first high pass filter amplifier 1044 is configured to acquire the first signal having a frequency higher than a second cutoff frequency, and amplify the acquired first signal to obtain a second signal.

The first high pass filter amplifier 1044 includes an instrumentation amplifier of the AD8232 chip type, resistor R3, capacitors C3 and C4. The ECG signal filtered by the first RC low pass filter 1042, that is, the first signal. Inputting the first signal to the instrumentation amplifier filters out the low frequency signal and amplifies the gain of the weak ECG signal by a factor of 100. Resistor R3, capacitors C3 and C4 form a two-pole high-pass filter with a cutoff frequency of 0.5 Hz. Resistor R3 and capacitor C3 form an RC network that feeds any near-DC signal back to the instrumentation amplifier, eliminating offsets without saturating any nodes and maintaining high signal gain. That is, the first signal is used as the input signal of the first high-pass filter amplifier 1044, and after the gain of the first signal is amplified by 100 times, the first signal having a frequency higher than 0.5 Hz is obtained as the second signal, and the second signal is The frequency range is from 0.5 Hz to 796 Hz.

In one embodiment, the second high pass filter amplifier 1046 is configured to acquire the second signal having a higher frequency than the third cutoff frequency, and amplify the acquired second signal to obtain a third signal.

The second high pass filter amplifier 1046 includes an operational amplifier A1 on the chip, resistors R4, R5, R6 and R7 and capacitors C5 and C6. The second signal enters the operational amplifier through capacitor C4 in the first high pass filter amplifier 1046, and resistors R6 and R7 determine the gain of the gain to be 101 times. The resistors R4 and R5 and the capacitors C5 and C6 form a two-pole high-pass filter with a cutoff frequency of 35 Hz. The Q value determined by the resistors R4, R5, R6, and R7 and the capacitors C5 and C6 is 0.68, which maximizes the filter. Degree and sharpening cutoff frequency, effectively avoiding signal distortion caused by filter self-excitation. Among them, the Q value is used to describe the quality of the loop. The higher the Q value, the smaller the loss and the higher the efficiency. That is, the second signal is used as the input signal of the second high-pass filter amplifier 1046, and after the gain of the second signal is amplified by 101 times, the second signal having a frequency higher than 35 Hz is obtained as the third signal, and the frequency of the second signal at this time. The range is 35 Hz to 796 Hz.

In one embodiment, the second RC low pass filter 1048 is configured to acquire the third signal having a frequency lower than the fourth cutoff frequency as the electrocardiographic analog signal.

The second RC low pass filter 1048 includes a resistor R8 and a capacitor C7 in series with the resistor R8. Capacitance Both ends of C7 are connected to signal output terminal ECG_OUT and ground. Resistor R8 and capacitor C7 form the RC low-pass filter at the output with a cutoff frequency of 159 Hz. The gain of the entire amplifying circuit is about 10000 times, and the amplified and filtered third signal finally enters the single chip 106 through ECG_OUT. That is, the third signal is used as an input signal of the second RC low-pass filter 1048, and the gain of the third signal is amplified by nearly 10,000 times, and then the third signal having a frequency lower than 159 Hz is obtained as an electrocardiogram analog signal. The frequency range of the electrical analog signal is 35 Hz to 159 Hz.

In one embodiment, the power module 1045 includes a +2.5V DC power supply and two decoupling capacitors C8 and C9. The C8 and C9 terminals are connected together with a +2.5V power supply and a pin 17 and the other end is grounded. In electronic circuits, decoupling capacitors are also called decoupling capacitors, and the interference of the output signal is used as a filtering object. Decoupling capacitors C8 and C9 eliminate self-excitation for the first high-pass filter amplifier 1044 and the second high-pass filter amplifier 1046, satisfying the change of the drive circuit current, avoiding mutual coupling interference, and making the first high-pass filter amplifier 1044 and the second high-pass filter. Amplifier 1046 operates steadily.

As an important part of the whole ECG signal detection device, the filter amplifier 104 determines the acquisition quality of the ECG signal and the system performance of the ECG signal detection device. After the filter amplifier 104 effectively solves the technical problem of weak ECG signal and interference noise on the arm, the single channel input mode is adopted, the lead is simple, the circuit integration is high, the operation is convenient, and the ECG signal on the arm can be accurately extracted.

In this embodiment, the single chip microcomputer 106 is configured to acquire the ECG analog signal, and convert the ECG analog signal into an ECG digital signal through an analog to digital converter 1062.

Signal data can be used to represent any information, such as symbols, text, speech, images, etc., which can be attributed to two types: analog signals and digital signals. The difference between the analog signal and the digital signal can be determined based on whether the amplitude value is discrete. The process of converting analog quantities into digital quantities is called analog-to-digital conversion, referred to as A/D (Analog to Digital) conversion; the circuit that completes the analog-to-digital conversion is called analog-to-digital converter, or ADC (Analog to Digital Converter). The electrocardiographic analog signal is converted into an electrocardiographic digital signal by an analog to digital converter 1062, and the electrocardiographic data waveform and the data analysis report can be generated based on the data of the electrocardiographic digital signal.

It should be noted that in order to ensure the accuracy of the data processing results, the AD converter must have sufficient conversion accuracy. At the same time, in order to meet the needs of fast process control and detection, the AD converter must also have a fast enough conversion speed.

The analog to digital converter 1062 performs analog to digital conversion of the electrocardiographic analog signal transmitted by the filter amplifier 104 to The electrocardiographic digital signal is sent to the display device 108. The display device 108 includes a mobile device 1082 that is wirelessly connected to the wireless transceiver 1066 and a host computer 1084 that is connected to the USB interface 1068 via a USB cable.

The ECG digital signal can be sent to the mobile device 1082 for monitoring and analysis in real time through the wireless transceiver 1066, and can also communicate with the host computer 1084 via the USB interface 1068 and upload data, and can also be collected by the built-in storage unit 1064 of the single chip microcomputer 106. The ECG digital signal performs ECG waveform storage and data analysis, is written into the SD card for storage, and sends the stored ECG waveform and data analysis after receiving the upload ECG data command sent by the display device 108.

The mobile device 1082 can be a mobile terminal that is paired with the microcontroller 106, or can be a dedicated device for other portable ECG detection instruments with a display. Since most people have mobile terminals and are convenient to use, no wired connection is required, and the ECG signal waveform and data analysis report can be sent to the family, friends or doctors via the network, and the preferred mobile device 1082 is the mobile terminal.

Since the filter amplifier 104 and the microcontroller 106 require power supply for normal operation, the device further includes a power module 105 for providing power to the filter amplifier 104 and the microcontroller 106.

As shown in FIG. 6 , a scene diagram of a single-arm detecting ECG signal is displayed. The user wears the ECG signal detecting device on the upper limb of the human body through the arm band 102. The current display device 108 is a mobile device 1082, and the mobile device 1082 is displayed on the mobile device 1082. The data waveform of the user's ECG signal.

Both the microcontroller 106 and the filter amplifier 104 require a power module to provide power to the filter amplifier and the microcontroller.

Among them, the model number of the single chip is CC2540. The CC2540 is a true system single-chip solution that provides a low-power Bluetooth solution for sensor applications and mobile handset peripherals. Of course, other types of single-chip microcomputers can also be used.

In order to solve the technical problem that the use of wet electrodes, lead wires and multi-stage operational amplifiers in the conventional technology is complicated, wear discomfort and signal interference are low, in one embodiment, an electrocardiogram is proposed. Signal detection method.

Specifically, as shown in FIG. 7, the foregoing method for detecting an electrocardiogram includes:

Step S102: After the armband is tied to the human limb, the heart is detected by the fabric electrode of the armband electric signal.

Step S104: The filter amplifier acquires the ECG signal, and the ECG signal is amplified and filtered to obtain an ECG analog signal.

Step S106: The single-chip microcomputer acquires the ECG analog signal, and converts the ECG analog signal into an ECG digital signal through an analog-to-digital converter.

In one embodiment, the filtering amplifier amplifying and filtering the electrocardiographic signal to obtain an electrocardiographic analog signal further includes: the first RC low-pass filter acquiring the electrocardiographic signal having a frequency lower than the first cutoff frequency As a first signal, the first high-pass filter amplifier acquires the first signal having a frequency higher than the second cutoff frequency, and amplifies the acquired first signal to obtain a second signal; the second high-pass filter amplifier acquires a frequency higher than The second signal of the third cutoff frequency, and the obtained second signal is amplified to obtain a third signal; and the second RC low pass filter obtains the third signal having a frequency lower than the fourth cutoff frequency as a The ECG analog signal is described.

In one embodiment, after the MCU acquires the analog-to-digital conversion of the electrocardiographic analog signal into an electrocardiographic digital signal, the method further includes: the storage unit storing and analyzing the ECG digital signal.

In one embodiment, after the MCU acquires the analog-to-digital conversion of the ECG analog signal into an ECG digital signal, the method further includes: transmitting, by the wireless transceiver, the ECG signal waveform to the wireless transceiver Wireless connected mobile device.

In one embodiment, after the MCU acquires the analog-to-digital conversion of the ECG analog signal into an ECG digital signal, the method further includes: sending, by the USB interface, the ECG signal waveform to the USB interface through the USB cable Connected to the host computer.

Implementation of the embodiments of the present invention will have the following beneficial effects:

After the above-mentioned electrocardiographic signal detecting device and method are adopted, since the electrocardiographic signal is detected by the fabric electrode of the armband in close contact with the human body, the conventional wet electrode is not required to be bonded between the electrode and the human body, and the utilization rate is high; The lead wires are connected directly through the buttons in the arm band, which reduces the cost and the signal interference caused by the lead wires, and is comfortable to wear; the high-precision filter amplifier ensures the ECG signal acquisition. Accuracy. Under the premise of not disturbing the normal life of the user, long-term dynamic monitoring of the patient's electrocardiogram can timely and effectively detect major heart diseases such as arrhythmia. The patient can conveniently detect the ECG signal in real time, improve the convenience of operation and the accuracy of the detection device.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and thus equivalent changes made in the claims of the present invention are still within the scope of the present invention.

Claims (10)

1. An electrocardiographic signal detecting device, comprising:

   An armband comprising a fabric electrode and a button connected to the fabric electrode, the fabric electrode for detecting an electrocardiographic signal;

   And a filter amplifier connected to the armband through the button, configured to acquire the ECG signal, and amplify and filter the ECG signal to obtain an ECG analog signal;

   And a single chip connected to the filter amplifier, configured to acquire the ECG analog signal, and convert the ECG analog signal into an ECG digital signal through an analog to digital converter.
2. The electrocardiographic signal detecting apparatus according to claim 1, wherein said filter amplifier comprises:

   a first RC low-pass filter connected to the button, configured to acquire the ECG signal having a frequency lower than the first cutoff frequency as the first signal;

   a first high-pass filter amplifier connected to the first RC low-pass filter, configured to acquire the first signal having a frequency higher than a second cutoff frequency, and amplify the acquired first signal to obtain a second signal ;

   a second high-pass filter amplifier connected to the first high-pass filter amplifier, configured to acquire the second signal having a frequency higher than a third cutoff frequency, and amplify the acquired second signal to obtain a third signal;

   a second RC low-pass filter connected to the second high-pass filter amplifier and connected to the single-chip microcomputer, and configured to acquire the third signal having a frequency lower than a fourth cut-off frequency as the ECG simulation signal.
3. The electrocardiographic signal detecting apparatus according to claim 1, wherein said single chip microcomputer further comprises a storage unit for storing and analyzing said electrocardiographic digital signal.
4. The electrocardiographic signal detecting apparatus according to claim 1, wherein said single chip microcomputer further comprises a wireless transceiver for transmitting said electrocardiographic signal waveform to a mobile device wirelessly connected to said wireless transceiver.
5. The electrocardiographic signal detecting apparatus according to claim 1, wherein said single chip microcomputer A USB interface is further included for transmitting the ECG signal waveform to a host computer connected to the USB interface through a USB cable.
6. A method for detecting an electrocardiogram signal, comprising:

   After the armband is attached to the human limb, the ECG signal is detected by the fabric electrode of the armband;

   The filter amplifier acquires the ECG signal, and amplifies and filters the ECG signal to obtain an ECG analog signal;

   The single-chip computer obtains the ECG analog signal, and converts the ECG analog signal into an ECG digital signal through an analog-to-digital converter.
7. The electrocardiographic signal detecting method according to claim 6, wherein the filtering amplifier amplifies and filters the electrocardiographic signal to obtain an electrocardiographic analog signal, further comprising:

   The first RC low pass filter acquires the ECG signal having a frequency lower than the first cutoff frequency as the first signal;

   The first high-pass filter amplifier acquires the first signal having a frequency higher than the second cutoff frequency, and amplifies the acquired first signal to obtain a second signal;

   The second high-pass filter amplifier acquires the second signal having a frequency higher than the third cutoff frequency, and amplifies the acquired second signal to obtain a third signal;

   The second RC low pass filter acquires the third signal having a frequency lower than the fourth cutoff frequency as the electrocardiographic analog signal.
8. The electrocardiographic signal detecting method according to claim 6, wherein the acquiring, by the single-chip microcomputer, the analog-to-digital conversion of the electrocardiographic analog signal into an electrocardiographic digital signal further comprises:

   The storage unit stores and analyzes the ECG digital signal.
9. The electrocardiographic signal detecting method according to claim 6, wherein the acquiring, by the single-chip microcomputer, the analog-to-digital conversion of the electrocardiographic analog signal into an electrocardiographic digital signal further comprises:

   A wireless transceiver transmits the ECG signal waveform to a mobile device that is wirelessly coupled to the wireless transceiver.
10. The electrocardiographic signal detecting apparatus according to claim 6, wherein the acquiring, by the single-chip microcomputer, the analog-to-digital conversion of the electrocardiographic analog signal into an electrocardiographic digital signal further comprises:

    The USB interface sends the ECG signal waveform to the USB interface connected to the USB interface Host computer.

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