CN108601544B - Device and method for electrocardiographic measurement - Google Patents
Device and method for electrocardiographic measurement Download PDFInfo
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- CN108601544B CN108601544B CN201680080697.5A CN201680080697A CN108601544B CN 108601544 B CN108601544 B CN 108601544B CN 201680080697 A CN201680080697 A CN 201680080697A CN 108601544 B CN108601544 B CN 108601544B
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
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Abstract
An apparatus (10) and method for electrocardiographic measurement. The device (10) comprises: a signal collector (11), an analog-to-digital converter (12) and a filter (13). The signal collector (11) is electrically connected with the analog-to-digital converter (12), and the analog-to-digital converter (12) is electrically connected with the filter (13). The signal collector (11) is used for obtaining an analog electrocardiosignal; the analog-to-digital converter (12) is used for converting the analog electrocardiosignal into a first digital electrocardiosignal; the filter (13) is used for filtering interference signals brought by a link in the first digital electrocardiosignal to obtain a second digital electrocardiosignal, and the link is a link between the signal collector (11) and the filter (13). The device (10) improves the accuracy of the electrocardiosignals by filtering the interference of the hardware link to the electrocardiosignals, so that the electrocardio measurement can be successfully realized under the condition of less lead quantity. Meanwhile, the device (10) has a small size, so that the electrocardio measurement enters a family, and daily family health care is realized.
Description
Technical Field
Embodiments of the present invention relate to the field of medical device technology, and more particularly, to an apparatus and method for electrocardiographic measurement.
Background
The Electrocardiogram (ECG) is an objective index of the process of occurrence, transmission and recovery of cardiac excitation. In each cardiac cycle, the heart is excited sequentially by a pace-making point, an atrium and a ventricle, and along with bioelectricity changes, a plurality of forms of graphs of potential changes, namely ECG, are led out of the body surface through an electrocardiograph.
The tissue and body fluid around the heart can conduct electricity, so that the human body can be regarded as a volume conductor with three-dimensional space of length, width and thickness. The heart is similar to the power supply, and the sum of the action potential changes of countless myocardial cells can be transmitted and reflected to the body surface. There are potential differences between many points on the body surface, and many points are isoelectric to each other.
The ECG measurement is the waveform of electrocardiogram obtained by the voltage difference of different parts on the surface of human body through a sensor. In the measurement of existing ECGs, electrodes, i.e. potential sensors, are placed on the chest and/or extremities and leads are derived from various digital combinations of ECG electrodes. In the clinical setting, a 12-lead ECG is the most common setup, comprising three standard limb leads and 6 precordial leads, often consisting of right, left and left leg leads, divided by three in a hospital examination.
In the existing ECG measurement, a plurality of leads for detecting the ECG lead to large volume and high power consumption of detection equipment, the detection equipment basically belongs to special equipment for hospitals, and users have to go to hospitals with the equipment for electrocardiogram detection, which brings inconvenience to the users.
Disclosure of Invention
The device and the method for measuring the electrocardio-signals carry out filtering processing on the digital electrocardio-signals converted from the collected analog electrocardio-signals, filter out interference signals brought by a hardware link, improve the accuracy of the signals, and successfully realize the electrocardio-measurement under the condition of less lead quantity, so that the device has smaller volume, the electrocardio-measurement enters a common family, and daily family health care is brought to family users.
In a first aspect, there is provided an apparatus for electrocardiography measurement, the apparatus comprising: the signal collector is electrically connected with the analog-to-digital converter, and the analog-to-digital converter is electrically connected with the filter; the signal collector is used for obtaining an analog electrocardiosignal; the analog-to-digital converter is used for converting the analog electrocardiosignal into a first digital electrocardiosignal; the filter is used for filtering an interference signal caused by a link in the first digital electrocardiosignal to obtain a second digital electrocardiosignal, and the link is a link between the signal collector and the filter.
Therefore, according to the device for measuring the electrocardio, which is disclosed by the embodiment of the invention, the acquired digital electrocardiosignals converted from the analog electrocardiosignals are filtered, interference signals brought by a hardware link are filtered, the accuracy of the signals is improved, the electrocardio measurement can be successfully realized under the condition of less lead number, and therefore, the device has smaller volume, the electrocardio measurement enters a common family, and daily family health care is brought to family users.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the filter is a matched filter, and a filter coefficient of the filter is determined according to a least square method and a functional relationship between a first reference signal transmitted at the position of the signal collector and a second reference signal generated from the first signal and received at the position of the filter.
That is to say, when designing the filter, a reference signal may be transmitted at the position of the signal collector, and when the reference signal reaches the position of the filter through the signal collector and the analog-to-digital converter, the reference signal may be interfered by a link between the signal collector and the filter, and the reference signal is received at the starting position of the circuit of the filter, and the relationship between the received reference signal and the transmitted reference signal may be described by a functional relationship, and according to the functional relationship and a least square method, a filter coefficient that maximizes the signal-to-noise ratio of the reference signal when filtering the reference signal may be obtained.
Optionally, the second digital electrocardiosignal is passed through a low-pass filter to filter out interference signals such as an electromyographic signal and a respiratory signal in the second digital electrocardiosignal.
Or, the first digital electrocardiographic signal may be first passed through a low-pass filter to filter interference signals such as an electromyographic signal and a respiratory signal in the first digital electrocardiographic signal, and then the digital electrocardiographic signal obtained after passing through the low-pass filter is further filtered to filter the interference signals brought by the hardware link.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the matched filter includes N-1 delay registers, N multipliers, and N adders; wherein, the N-1 delay registers are connected in series in sequence, the input end of the matched filter is coupled with the input end of the 1 st delay register and the input end of the 1 st multiplier respectively, the output end of the ith delay register is coupled with the input end of the (i +1) th multiplier, the output end of the ith multiplier is coupled with the input end of the ith adder, the N adders are connected in series in sequence, and the output end of the Nth adder is coupled with the output end of the matched filter; the first digital electrocardiosignal is input from the input end of the matched filter, and the signal output by the matched filter is the second digital electrocardiosignal; n-1, N being a positive integer greater than 1.
With reference to the first aspect, or the first possible implementation manner or the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the signal collector includes a first potential sensor and a second potential sensor, and the signal collector is specifically configured to: the first electric potential sensor and the second electric potential sensor sense the change of the potential difference between the first position and the second position to obtain the analog electrocardiosignal.
In other words, the device for measuring the electrocardio only needs two potential sensors to acquire electrocardiosignals, and compared with the device for measuring the electrocardio in the prior art, the device for measuring the electrocardio adopts fewer potential sensors, so that the device has smaller volume and is convenient to use and carry.
With reference to the first aspect, any one of the first to third possible implementation manners of the first aspect, in a fourth possible implementation manner of the first aspect, the apparatus further includes a signal amplifier, and the signal amplifier is electrically connected to the signal collector and the analog-to-digital converter; the signal amplifier is used for amplifying the analog electrocardiosignal to obtain an amplified analog electrocardiosignal; wherein, the analog-to-digital converter is specifically configured to: and converting the amplified analog electrocardiosignal into a first digital electrocardiosignal.
With reference to the first aspect, in a fifth possible implementation manner of the first aspect, the apparatus further includes a memory, where the memory is electrically connected to the signal collector, the analog-to-digital converter, and the filter; the memory is used for storing the analog electrocardiosignal, the first digital electrocardiosignal and the second digital electrocardiosignal.
With reference to the first aspect, any one of the first to fifth possible implementation manners of the first aspect, in a sixth possible implementation manner of the first aspect, the apparatus further includes a display; the display is used for presenting the corresponding electrocardiographic waveform of the second digital electrocardiographic signal to a user.
With reference to the first aspect, any one of the first to fifth possible implementation manners of the first aspect, in a seventh possible implementation manner of the first aspect, the apparatus further includes a bluetooth module, and the bluetooth module is electrically connected to the filter; the bluetooth module is configured to transmit the second digital electrocardiosignal to the mobile terminal through a bluetooth protocol, so that the mobile terminal stores the second digital electrocardiosignal and presents an electrocardio waveform corresponding to the second digital electrocardiosignal to a user.
Therefore, the electrocardiosignal can be stored and analyzed through the mobile terminal, and the complexity of the electrocardio measuring device can be reduced.
With reference to the first aspect and any one of the first to fifth possible implementation manners of the first aspect, in an eighth possible implementation manner of the first aspect, the apparatus includes a Universal Serial Bus (USB) module, and the USB module is electrically connected to the filter; the USB module is used for outputting the second digital electrocardiosignal to the mobile terminal according to a USB connection protocol so that the mobile terminal can store the second digital electrocardiosignal and present an electrocardio waveform corresponding to the second digital electrocardiosignal to a user.
With reference to the third possible implementation manner of the first aspect, in a ninth possible implementation manner of the first aspect, the apparatus is a weighing scale, the weighing scale further includes a housing, the first potential sensor is located on a surface of the housing at a position corresponding to a left sole of a measured person, and the second potential sensor is located on a surface of the housing at a position corresponding to a right sole of the measured person.
In a second aspect, a method for electrocardiography is provided, the method being performed by the apparatus of the first aspect or any possible implementation manner of the first aspect.
In a third aspect, a computer-readable medium is provided for storing a computer program comprising instructions for performing the method of the second aspect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic block diagram of an apparatus for electrocardiographic measurement according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a circuit of a matched filter according to an embodiment of the present invention;
FIG. 3 is another schematic block diagram of an apparatus for electrocardiographic measurement according to an embodiment of the present invention;
FIG. 4 is yet another schematic block diagram of an apparatus for electrocardiography measurement according to an embodiment of the present invention;
FIG. 5 is yet another schematic block diagram of an apparatus for electrocardiography measurement according to an embodiment of the present invention;
FIG. 6 is yet another schematic block diagram of an apparatus for electrocardiography measurement according to an embodiment of the present invention;
FIG. 7 is a schematic view of a scale according to an embodiment of the invention;
FIG. 8 is a schematic flow chart diagram of a method for electrocardiography measurement in accordance with an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
For the convenience of understanding the embodiment of the present invention, the principle of electrocardiography is first described. Before the heart contracts mechanically, electrical excitation is firstly generated to generate bioelectricity, the tissue and body fluid around the heart can conduct electricity, so the bioelectricity can be conducted to the body surface through the tissue and the body fluid to generate different potential changes at different parts of the body, two potential sensors are contacted with two parts of the body surface to sense the changes of the potential difference of the two parts, and a dynamic curve formed by recording the changes of the potential difference is an Electrocardiogram (ECG).
It is understood that, in the embodiment of the present invention, the electric potential sensor may also be referred to as an "electrode" or an "electrocardiograph electrode", and a currently commonly used Ag/AgCl electrode may be used, which is not limited in the present invention.
Fig. 1 shows an apparatus for electrocardiographic measurement according to an embodiment of the present invention, and as shown in fig. 1, the apparatus 10 includes: signal collector 11, adc 12 and filter 13, the adc 12 is electrically connected to the signal collector 11, the filter 13 is electrically connected to the adc 12:
the signal collector 11 is used for obtaining an analog electrocardiosignal;
the analog-to-digital converter 12 is configured to convert the analog electrocardiographic signal into a first digital electrocardiographic signal;
the filter 13 is configured to filter an interference signal caused by a link in the first digital electrocardiographic signal to obtain a second digital electrocardiographic signal, where the link is a link between the signal collector 11 and the filter 13.
Generally, the analog electrocardiographic signal acquired by the signal acquisition device 11 is very weak, usually in the order of microvolts to millivolts, and in order to facilitate drawing an electrocardiographic waveform, the electrocardiographic signal needs to be amplified, as shown in fig. 1, the apparatus 10 further includes: the signal amplifier 14, the signal amplifier 14 is electrically connected to the signal collector 11 and the analog-to-digital converter 12, and is configured to amplify the analog electrocardiographic signal acquired by the signal collector 11 to obtain an amplified analog electrocardiographic signal.
And further, as shown in fig. 1, the apparatus 10 further includes a memory 15 for storing the analog electrocardiographic signal, the first digital electrocardiographic signal, and the second digital electrocardiographic signal acquired by the signal acquisition unit 11.
Alternatively, as an example, the filter 13 is a matched filter, the circuit of the matched filter is shown in fig. 2, the matched filter shown in fig. 2 comprises N-1 delay registers, N multipliers and N adders, in fig. 2, X (N) -X (N-N +1) represents the digital electrocardiosignals, h (0) -h (N-1) represents the filter coefficients of the matched filter,
which represents a multiplier, is shown as,
denotes an adder, Z-1The delay register is shown, and Y (n) shows the digital electrocardiosignals output after being filtered by the matched filter.
Specifically, the N-1 delay registers are sequentially connected in series, the input end of the matched filter is coupled with the input end of the 1 st delay register and the input end of the 1 st multiplier respectively, the output end of the ith delay register is coupled with the input end of the (i +1) th multiplier, the output end of the ith multiplier is coupled with the input end of the ith adder, the N adders are sequentially connected in series, and the output end of the nth adder is coupled with the output end of the matched filter; the first digital electrocardiosignal is input from the input end of the matched filter, and the signal output by the matched filter is the second digital electrocardiosignal; n-1, N being a positive integer greater than 1. That is, the output signal y (n) in fig. 2 can be formulated as: y (N) ═ X (N) × h (0) + X (N-1) × h1+. + X (N-N +1) × h (N-1).
It is understood that the matched filter in fig. 2 is only an example, and the matched filter in the embodiment of the present invention may also be another form of matched filter in the prior art, and will not be described in detail herein.
In general, after the circuit design is completed, the circuit design is fixed, so that the filter coefficient of the matched filter needs to be determined when designing the matched filter, and a specific method may be to transmit a reference signal R1 with a larger power at the signal collector 11, collect the reference signal S1 generated by the reference signal R1 at the start position of the circuit of the matched filter, and generally express the functional relationship between S1 and R1 as formula (1):
S1＝H*R1 (1)
where H denotes a channel parameter matrix at the start position of the circuit from the signal collector 11 to the matched filter.
Further, the filter coefficients can be obtained according to equations (1) to (3) and the least square method:
H*＝INV(A1T*A1)*A1T*S1 (2)
H**H＝1 (3)
in the formula (2), H*An inverse matrix representing H, H*The elements in (1) are filter coefficients, INV () represents the inversion operation of a matrix, A1 is a covariance matrix obtained by processing the acquired reference signal S1, A1TRepresenting the transposed matrix of a 1.
After the filtering process by the matched filter, at the end of the circuit of the matched filter, the received signal S' can be expressed as formula (4):
S’＝R1*H*H* (4)
therefore, the first digital electrocardiosignal is filtered by the matched filter, so that the acquired electrocardiosignal can be obtained in a theoretically lossless manner, and the electrocardiosignal with high signal-to-noise ratio can be obtained in an actual application scene.
It should be noted that the filter in the embodiment of the present invention is not limited to a linear filter, and may also be a nonlinear filter of other forms, and the method for determining the filter coefficient by transmitting the reference signal described above is also applicable to determining the filter coefficient of the nonlinear filter.
Furthermore, the analog electrocardiographic signal of the subject acquired by the signal acquisition device 11 may further include interference signals such as a myoelectric signal and a respiratory signal of the human body, so that a common filter circuit (low-pass filter circuit) may be added after the matched filter to filter the interference signals such as the myoelectric signal and the respiratory signal.
Moreover, the wavelet denoising processing can be performed on the digital electrocardiosignals after passing through the filter 13, and a specific implementation manner of the wavelet denoising can be selected according to actual needs, which is not limited in the present invention.
Optionally, as an example, as shown in fig. 3, the signal collector 11 includes a first potential sensor 111 and a second potential sensor 112, and the signal collector 11 obtains the analog electrocardiograph signal by sensing a change in potential difference between the first position and the second position by the first potential sensor 111 and the second potential sensor 112.
Optionally, as shown in fig. 4, as an example, the device 10 may further include an audio circuit 16 and a speaker 161, the audio circuit 16 is electrically connected to the signal collector 11, the audio circuit 16 may transmit an electrical signal obtained by converting received audio data to the speaker 161, and the audio signal is converted into a sound signal by the speaker 161 for output, so that the device 10 may notify the testee of success or failure of the electrocardiographic measurement through a voice prompt manner, for example, if the signal collector 11 successfully acquires the electrocardiographic signal of the testee, the speaker 161 may emit a prompt tone of "success of measurement", and if the signal collector 11 does not successfully acquire the electrocardiographic signal of the testee, the speaker 161 may emit a prompt tone of "failure of measurement, please measure again", and the testee may determine whether the measurement is successful according to the prompt tone.
Optionally, as shown in fig. 5, as an example, the device 10 further includes a Display 17, the Display 17 is electrically connected to the signal collector 11 and the filter 13, the Display 17 may be a Liquid Crystal Display ("LCD"), and a measurement indicator light 171 (which may be a light emitting diode) is disposed on the Display 17, and when the signal collector 11 successfully acquires the electrocardiographic signal of the measured person, the measurement indicator light 171 is turned on to notify the measured person that the signal collection is successful, so that the measured person may stop contacting the device 10. If the signal acquisition device 11 has not successfully acquired the electrocardiographic signal of the subject when the subject stops contacting the device 10, the measurement indicator light 171 emits a warning signal (for example, the measurement indicator light 171 is always in a flashing state) to indicate that the subject has contacted the device 10 again to complete the measurement.
Alternatively, when the subject comes into contact with the device 10, the display 17 starts displaying a measurement time countdown, for example, if 5 seconds are required for the signal acquisition unit 11 to successfully acquire the electrocardiographic signal of the subject, when the subject comes into contact with the device 10, the display 17 starts counting down from 5, and when the displayed number is 0, it indicates that the signal acquisition unit 11 has successfully acquired the electrocardiographic signal of the subject.
Further, the display 17 is also used to present the user with an electrocardiographic waveform corresponding to the second digital electrocardiographic signal.
Fig. 6 shows a further schematic block diagram of the apparatus 10 according to an embodiment of the invention, as shown in fig. 6, the apparatus 10 further comprising: a bluetooth module 18. Therefore, the device 10 can be connected in a pairing manner with a mobile terminal through the bluetooth module 18, and the mobile terminal can be a smart phone, a tablet computer or a notebook computer. After the device 10 is connected to the mobile terminal, the second digital electrocardiosignal is transmitted to the mobile terminal through the bluetooth module 18, the mobile terminal stores the second digital electrocardiosignal, analyzes the second digital electrocardiosignal through professional software, generates an electrocardio waveform based on the second digital electrocardiosignal, and displays the electrocardio waveform on the display screen. The mobile terminal can store a standard electrocardiographic waveform in advance, and after the electrocardiographic waveform is generated by the mobile terminal, the generated electrocardiographic waveform is compared with the standard electrocardiographic waveform, and the health condition of the tested person is judged according to the comparison result.
Optionally, as an example, as shown in fig. 6, the apparatus 10 further includes: a Serial Bus (USB) module 19, the apparatus 10 may be connected to the mobile terminal through the USB module 19 according to a USB connection protocol, and transmit the second digital electrocardiographic signal to the mobile terminal, so that the mobile terminal processes the received digital electrocardiographic signal.
Those skilled in the art will appreciate that the configuration of the device 10 shown in fig. 1-6 does not constitute a limitation of the device 10 and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components. For example, the device 10 may also include a power supply, a Wireless Fidelity (WiFi) module, etc. for powering the various components of the device 10.
As a specific example, the device 10 is a weighing scale shown in fig. 7, the weighing scale includes a housing, the first electric potential sensor 111 is located at a left sole position on the housing, the second electric potential sensor 112 is located at a right sole position on the housing, when the two feet of the person to be measured stand at the corresponding positions of the weighing scale, the weighing scale starts measurement, and the electrocardiograph signal of the person to be measured is obtained by sensing a change in the electric potential difference between the two feet of the person to be measured through the first electric potential sensor 111 and the second electric potential sensor 112. Or, the device 10 is provided with a measurement start switch, when the two feet of the measured person stand to the corresponding positions of the device 10, the measured person manually turns on the measurement switch on the body device 10 to start measuring the electrocardiosignals of the measured person. It is understood that if the apparatus 10 is not a scale, the positions of the first electric potential sensor 111 and the second electric potential sensor 112 may be placed at any positions convenient for contact with the body of the subject.
Optionally, as shown in fig. 7, the scale may further include a display 17, the display 17 is provided with a measurement indicator light 171, and the specific working methods of the display 17 and the measurement indicator light 171 are the same as those described above and are not described again here.
The apparatus for electrocardiographic measurement according to the embodiment of the present invention is described in detail above with reference to fig. 1 to 7, and the apparatus for electrocardiographic measurement 10 can perform the following method 1000 for electrocardiographic measurement, as shown in fig. 8, where the method 1000 includes:
s1100, acquiring a simulated electrocardiosignal;
s1200, converting the analog electrocardiosignal into a first digital electrocardiosignal;
and S1300, filtering an interference signal caused by a link in the first digital electrocardiosignal to obtain a second digital electrocardiosignal, wherein the link is a link between the position for acquiring the analog electrocardiosignal and the position for filtering the interference signal caused by the link in the first digital electrocardiosignal.
In this embodiment of the present invention, optionally, the filtering out an interference signal present in the first digital electrocardiographic signal and caused by a link includes: and filtering an interference signal caused by a link in the first digital electrocardiosignal by adopting a matched filter, wherein the filter coefficient of the matched filter is determined according to a least square method and a functional relation between a first reference signal transmitted at the position for acquiring the analog electrocardiosignal and a second reference signal generated by the first signal and received at the position of the matched filter.
In the embodiment of the present invention, optionally, the matched filter includes N-1 delay registers, N multipliers, and N adders; wherein, the N-1 delay registers are connected in series in sequence, the input end of the matched filter is coupled with the input end of the 1 st delay register and the input end of the 1 st multiplier respectively, the output end of the ith delay register is coupled with the input end of the (i +1) th multiplier, the output end of the ith multiplier is coupled with the input end of the ith adder, the N adders are connected in series in sequence, and the output end of the Nth adder is coupled with the output end of the matched filter; the first digital electrocardiosignal is input from the input end of the matched filter, and the signal output by the matched filter is the second digital electrocardiosignal; n-1, N being a positive integer greater than 1.
In the embodiment of the present invention, optionally, S1100 specifically is: the analog cardiac signal is obtained by sensing a change in the potential difference between the first location and the second location.
In the embodiment of the present invention, optionally, the method further includes: amplifying the analog electrocardiosignal to obtain an amplified analog electrocardiosignal;
wherein S1200 specifically is: and converting the amplified analog electrocardiosignal into a first digital electrocardiosignal.
In the embodiment of the present invention, optionally, the method further includes: storing the analog cardiac signal, the first digital cardiac signal, and the second digital cardiac signal.
In the embodiment of the present invention, optionally, the method further includes: an electrocardiographic waveform corresponding to the second digital electrocardiographic signal is presented to the user.
In this embodiment of the present invention, optionally, the step of presenting the electrocardiographic waveform corresponding to the second digital signal to the user may specifically be: and transmitting the second digital electrocardiosignal to the mobile terminal through a Bluetooth protocol so that the mobile terminal can store the second digital electrocardiosignal and present an electrocardio waveform corresponding to the second digital electrocardiosignal to a user.
In this embodiment of the present invention, optionally, the step of presenting the electrocardiographic waveform corresponding to the second digital signal to the user may specifically be: and outputting the second digital electrocardiosignal to the mobile terminal according to a Universal Serial Bus (USB) connection protocol so that the mobile terminal can store the second digital electrocardiosignal and present an electrocardio waveform corresponding to the second digital electrocardiosignal to a user.
Therefore, according to the method for measuring the electrocardio, which is disclosed by the embodiment of the invention, the acquired digital electrocardiosignals converted from the analog electrocardiosignals are filtered, interference signals brought by a hardware link are filtered, the accuracy of the signals is improved, the electrocardio measurement can be successfully realized under the condition of less lead number, and therefore, the device has smaller volume, the electrocardio measurement enters a common family, and daily family health care is brought to family users.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An apparatus for electrocardiographic measurement, the apparatus comprising: the signal collector is electrically connected with the analog-to-digital converter, and the analog-to-digital converter is electrically connected with the filter;
the signal collector is used for obtaining an analog electrocardiosignal;
the analog-to-digital converter is used for converting the analog electrocardiosignal into a first digital electrocardiosignal;
the filter is used for filtering an interference signal caused by a link in the first digital electrocardiosignal to obtain a second digital electrocardiosignal, and the link is a link between the signal collector and the filter;
the filter is a matched filter, and the filter coefficient of the filter is determined according to a functional relation and a least square method between a first reference signal transmitted at the position of the signal collector and a second reference signal generated by the first reference signal and received at the position of the filter;
wherein the functional relationship is S1 ═ H × R1, the S1 is the second reference signal, the R1 is the first reference signal, and the H denotes a channel parameter matrix at a start position of a circuit from the signal collector to the matched filter;
H*＝INV(A1T*A1)*A1T*S1；
H**H＝1；
said H*An inverse matrix representing the H, the H*The INV () represents an inversion operation of a matrix, the a1 is a covariance matrix obtained by processing the acquired second reference signal, and the a1 is aTRepresenting the transposed matrix of the a 1.
2. The apparatus of claim 1, wherein the matched filter comprises N-1 delay registers, N multipliers, and N adders;
wherein, the N-1 delay registers are connected in series in sequence, the input end of the matched filter is coupled with the input end of the 1 st delay register and the input end of the 1 st multiplier respectively, the output end of the ith delay register is coupled with the input end of the (i +1) th multiplier, the output end of the ith multiplier is coupled with the input end of the ith adder, the N adders are connected in series in sequence, and the output end of the nth adder is coupled with the output end of the matched filter;
the first digital electrocardiosignal is input from the input end of the matched filter, and the signal output by the matched filter is the second digital electrocardiosignal;
i is 1,2 … N-1, N is a positive integer greater than 1.
3. The apparatus of claim 1, wherein the signal collector comprises a first potential sensor and a second potential sensor, the signal collector being configured to:
and sensing the change of the potential difference between the first position and the second position by the first potential sensor and the second potential sensor to obtain the analog electrocardiosignal.
4. The apparatus of any one of claims 1 to 3, further comprising a signal amplifier electrically connected to the signal collector and the analog-to-digital converter;
the signal amplifier is used for amplifying the analog electrocardiosignals to obtain amplified analog electrocardiosignals;
wherein the analog-to-digital converter is specifically configured to: and converting the amplified analog electrocardiosignal into a first digital electrocardiosignal.
5. The apparatus of any one of claims 1 to 3, further comprising a memory electrically connected to the signal collector, the analog-to-digital converter, and the filter;
the memory is used for storing the analog electrocardiosignal, the first digital electrocardiosignal and the second digital electrocardiosignal.
6. The device of any one of claims 1 to 3, further comprising a display;
and the display is used for presenting the corresponding electrocardiographic waveform of the second digital electrocardiographic signal to a user.
7. The device according to any one of claims 1 to 3, further comprising a Bluetooth module electrically connected to the filter;
the Bluetooth module is used for transmitting the second digital electrocardiosignal to a mobile terminal through a Bluetooth protocol so that the mobile terminal can store the second digital electrocardiosignal and present an electrocardio waveform corresponding to the second digital electrocardiosignal to a user.
8. The device according to any one of claims 1 to 3, wherein the device comprises a Universal Serial Bus (USB) module, the USB module being electrically connected to the filter;
the USB module is used for outputting the second digital electrocardiosignal to the mobile terminal according to a USB connection protocol, so that the mobile terminal can store the second digital electrocardiosignal and present an electrocardio waveform corresponding to the second digital electrocardiosignal to a user.
9. The apparatus according to claim 3, wherein the apparatus is a scale, the scale further comprising a housing, the first electric potential sensor being located on a surface of the housing at a position corresponding to a left ball of a subject's foot, the second electric potential sensor being located on a surface of the housing at a position corresponding to a right ball of a subject's foot.
10. A method for electrocardiography measurement, the method comprising:
acquiring a simulated electrocardiosignal;
converting the analog electrocardiosignal into a first digital electrocardiosignal;
filtering an interference signal caused by a link in the first digital electrocardiosignal to obtain a second digital electrocardiosignal, wherein the link is a link between the position for acquiring the analog electrocardiosignal and the position for filtering the interference signal caused by the link in the first digital electrocardiosignal;
the filtering of the interference signal caused by the link existing in the first digital electrocardiosignal includes:
filtering an interference signal caused by a link in the first digital electrocardiosignal by using a matched filter, wherein the filter coefficient of the matched filter is determined according to a least square method and a functional relation between a first reference signal transmitted at the position for acquiring the analog electrocardiosignal and a second reference signal generated by the first reference signal and received at the position of the matched filter;
wherein the functional relationship is S1 ═ H × R1, the S1 is the second reference signal, the R1 is the first reference signal, and the H denotes a channel parameter matrix at a start position of a circuit from the signal collector to the matched filter;
H*＝INV(A1T*A1)*A1T*S1；
H**H＝1；
said H*An inverse matrix representing the H, the H*The INV () represents an inversion operation of a matrix, the a1 is a covariance matrix obtained by processing the acquired second reference signal, and the a1 is aTRepresenting the transposed matrix of the a 1.
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| PCT/CN2016/092183 WO2018018570A1 (en) | 2016-07-29 | 2016-07-29 | Device and method for measuring electrocardiogram |
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| CN108542379A (en) * | 2018-06-01 | 2018-09-18 | 北京卓冉科技有限公司 | Heart early-warning apparatus |
| CN109876255A (en) * | 2019-03-21 | 2019-06-14 | 南京市江宁医院 | A kind of first aid Combined integrated machine |
| CN110523000B (en) * | 2019-08-06 | 2023-07-28 | 深圳市理邦精密仪器股份有限公司 | Electrocardiogram simulation device |
| CN112603327B (en) * | 2019-12-18 | 2022-03-11 | 华为技术有限公司 | Electrocardiosignal detection method, device, terminal and storage medium |
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| US20090082691A1 (en) * | 2007-09-26 | 2009-03-26 | Medtronic, Inc. | Frequency selective monitoring of physiological signals |
| CN102100553A (en) * | 2009-12-18 | 2011-06-22 | 中国科学院沈阳自动化研究所 | Method for detecting gastric electrogram slow wave signals on the basis of RLS adaptive filter |
| EP2904963B1 (en) * | 2014-02-06 | 2017-01-25 | IMEC vzw | System and method for acquisition of biopotential signals with motion artifact reduction in real time operation |
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