WO2018032610A1

WO2018032610A1 - Heart rate measurement device and method

Info

Publication number: WO2018032610A1
Application number: PCT/CN2016/103762
Authority: WO
Inventors: 萧伟; 杨术; 明中行; 潘岱; 吴振洲; 杨超; 陈仕科
Original assignee: 深圳欧德蒙科技有限公司
Priority date: 2016-08-16
Filing date: 2016-10-28
Publication date: 2018-02-22
Also published as: CN106264509A

Abstract

A heart rate measurement device and method, the method comprising: generating fixed frequency band electromagnetic waves by an internal oscillating module (10); transmitting, by an electromagnetic wave transmitting probe (20), the electromagnetic waves to a region to be detected; receiving, by an echo signal acquiring probe (30), echo signals reflected by a reflection source and sending the echo signals to a signal analyzing module (40); extracting, by the signal analyzing module (40), electrocardiosignals according to the echo signals and acquiring heart rate measurement data according to the electrocardiosignals. The described non-intrusive measurement method can overcome defects of electrocardio and photoelectric methods in heart rate measurement, avoid inconvenience in wearing for a user to be measured, and facilitate test deployment. The heart rate measurement device and method are suitable for environments of households, working places and the like and capable of carrying out heart rate measurement on a plurality of users at the same time in an automatic, accurate, real-time and non-intrusive way.

Description

Heart rate measuring device and method

Technical field

Embodiments of the present invention relate to the field of medical instrument technology, and in particular, to a heart rate measuring device and method.

Background technique

In the prior art, the commonly used heart rate measuring instruments include: a fiber grating sensor-based measuring instrument, a blood pressure meter, a photoelectric intelligent pulse-based measuring instrument, an electrocardiographic measuring instrument, etc., and the above instruments are based on the following four principles:

Pressure principle

During a heartbeat period, the pressure within the arteries fluctuates periodically as the heart contracts. The pressure sensor is used to measure the change of the pressure, and the heart rate can be calculated after being processed by the amplifier circuit, the filter circuit, and the microprocessor. This method is often used in conjunction with blood pressure measurement, and requires an air pump when used. The sphygmomanometer generally uses this method to measure heart rate.

2. Resistance principle

The electrical resistance of the human arterial blood changes with the flow of blood, and the heart rate can be extracted by this change. However, the skin has a great influence on this method, and different measurement results of different time-tested subjects are affected to varying degrees, so this method is generally not used to measure heart rate.

3. ECG principle

This is currently the most widely used and most accurate method in medicine. It can not only measure heart rate, but also accurately obtain a variety of ECG parameters. Electrocardiogram (ECG) is the best way to measure and diagnose abnormal heart rhythms. The instrument that uses ECG to measure heart rate is mainly an electrocardiograph.

4. Photoelectric principle

The process of blood filling and blood flow in the human heart, the blood volume and flow rate in the blood vessels will change. It will affect its reflectivity to light. Through this principle, a photoelectric-based heart rate measurement method has been developed. This method generally uses a photoelectric sensor including an infrared emitting and infrared receiving diode to collect pulse information, and calculates a heart rate through an amplifying circuit and signal processing. The part where the heart rate is collected is generally the fingertip or the auricle.

Among the above four measurement methods, the first two methods need to be measured by the user under test, which is inconvenient, and the latter two active methods also have the following deficiencies:

At present, the analysis devices that actively measure heart rate are mostly in the form of ECG (electrocardiogram) and photoelectric (PPG, photoplethysmographg), among which:

In the PPG format, the blood absorption rate of light is measured by photoplethysmography, and the heart rate is calculated. The ECG form measures the change of bioelectricity through a closed loop of bioelectricity in the lead, and then calculates the heart rate.

However, the shortcomings of the PPG method are poor heart rate accuracy, easy to be interfered by other light, and the influence of skin sweat when worn. The disadvantage of the ECG method is that the measuring device is more complicated to wear and needs to form a closed loop, which is not convenient for daily wear. .

In view of this, overcoming the technical deficiencies existing in the prior art described above is an urgent problem to be solved in the technical field.

Summary of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a heart rate measuring device and method, which can provide a non-invasive heart rate measuring device with a good user experience and a corresponding heart rate extracting method.

In order to solve the above technical problem, one technical solution adopted by the embodiment of the present invention is to provide a heart rate measuring device.

The device comprises: an internal oscillation module, an electromagnetic wave transmitting probe, an echo signal acquisition probe and a signal analysis module, wherein:

The internal oscillation module is configured to generate electromagnetic waves in a fixed frequency band;

The electromagnetic wave transmitting probe is configured to emit the electromagnetic wave to an area to be tested;

The echo signal acquisition probe is configured to receive an echo signal reflected by the reflection source, and Transmitting an echo signal to the signal analysis module;

The signal analysis module is configured to extract an ECG signal according to the echo signal, and obtain heart rate measurement data according to the ECG signal.

Preferably, the internal oscillation module includes an oscillator and a matching circuit, wherein the oscillator is used to generate an alternating current signal, and the matching circuit is configured to generate an electromagnetic wave of the fixed frequency band according to the alternating current signal.

Preferably, the electromagnetic wave transmitting probe transmits the electromagnetic wave by using a frequency modulation carrier, the frequency modulation carrier has a transmission frequency of 5.25 GHz to 7.25 GHz, and the frequency modulation carrier has a transmission period of 2 milliseconds.

Preferably, the signal analysis module comprises a micro processing unit, a sampling unit, an amplifying unit, and a filtering unit, wherein the micro processing unit is configured to execute a signal analysis instruction according to a specific timing, and the sampling unit is configured to use the echo The signal performs sampling processing to obtain a sampling signal, and the amplifying unit is configured to perform amplification processing on the sampling signal, and the filtering unit is configured to remove noise in a specific waveform.

Preferably, the signal analysis module further comprises a phase analysis unit, wherein the phase analysis unit is configured to determine a reflection source that generates the echo signal according to a phase characteristic of the echo signal.

In order to solve the above technical problem, another technical solution adopted by the embodiment of the present invention is to provide a heart rate detecting method, and the method includes:

Electromagnetic waves are generated by an internal oscillation module;

An electromagnetic wave transmitting probe emits the electromagnetic wave to an area to be tested;

The echo signal acquisition probe receives the echo signal reflected by the reflection source, and sends the echo signal to the signal analysis module;

The signal analysis module extracts an electrocardiographic signal according to the echo signal, and obtains heart rate measurement data according to the ECG signal.

Preferably, the electromagnetic wave transmitting probe transmitting the electromagnetic wave to the area to be tested comprises:

The electromagnetic wave transmitting probe transmits the electromagnetic wave by using a frequency modulation carrier. The frequency modulation carrier has a transmission frequency of 5.25 GHz to 7.25 GHz, and the frequency modulation carrier has a transmission period of 2 milliseconds.

Preferably, the signal analysis module extracts an ECG signal according to the echo signal, and further includes Obtaining heart rate measurement data according to the ECG signal includes:

Determining a reflection time of the electromagnetic wave according to a transmission time of the carrier signal and a reception time of the echo signal;

Preferably, the signal analysis module extracts an electrocardiogram signal according to the echo signal, and obtains heart rate measurement data according to the ECG signal, further comprising:

The carrier signal is divided into different regions according to the reflection time to distinguish echo signals generated by different obstacles and different human bodies.

A reflection source that generates the echo signal is determined according to a phase characteristic of the echo signal, and heart rate data is determined according to an echo signal of the reflection source.

Compared with the prior art, the present invention has the beneficial effects of providing a non-invasive measuring device and a corresponding heart rate extraction method, which is free from inconvenience of being worn by the user to be tested, and is convenient for test deployment. The present invention is applicable to a home or a workplace. Such as the environment, you can achieve heart rate measurement operation for multiple people at the same time in self-accurate, accurate, real-time, and non-perceived situations.

DRAWINGS

1 is a schematic structural view of a first embodiment of a heart rate measuring device according to an embodiment of the present invention;

2 is a schematic structural diagram of a second embodiment of a heart rate measuring device according to an embodiment of the present invention;

3 is a schematic structural diagram of a third embodiment of a heart rate measuring device according to an embodiment of the present invention;

4 is a flowchart of a fourth embodiment of a heart rate measurement method according to an embodiment of the present invention;

FIG. 5 is a flowchart of a fifth embodiment of a heart rate measurement method according to an embodiment of the present invention; FIG.

6 is a flowchart of a sixth embodiment of a heart rate measurement method according to an embodiment of the present invention;

FIG. 7 is a flowchart of a seventh embodiment of a heart rate measurement method according to an embodiment of the present invention.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Further, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.

Example 1:

The first embodiment of the present invention provides a first preferred embodiment of a heart rate detecting device. FIG. 1 is a schematic structural view of a first embodiment of a heart rate measuring device according to an embodiment of the present invention.

Referring to FIG. 1 , a heart rate measuring device provided by this embodiment includes: an internal oscillation module 10 , an electromagnetic wave transmitting probe 20 , an echo signal acquiring probe 30 , and a signal analyzing module 40 .

It can be understood that each module of the device can be integrated into one housing and form a heart rate measuring device with a matching power module, a communication module and the like. The device can be placed in a public place to test the heart rate of the human body in the coverage area, for example, a school, a hospital, a station, etc., or can be set in a home for detecting heart rate data of family members.

Specifically, the internal oscillation module 10 of the device is configured to generate electromagnetic waves in a fixed frequency band;

The electromagnetic wave transmitting probe 20 is configured to emit electromagnetic waves to the area to be tested;

The echo signal acquisition probe 30 is configured to receive the echo signal reflected by the reflection source, and send the echo signal to the signal analysis module 40;

The signal analysis module 40 is configured to extract an ECG signal according to the echo signal, and obtain heart rate measurement data according to the ECG signal.

Preferably, when the reflection source is in a specific location area in the environment to be tested, the solution may directly analyze the echo signal generated by the reflection source to obtain heart rate data corresponding to the reflection source.

Preferably, when the position of the reflection source is not specified in the environment to be tested, the received echo signal cannot be associated with the reflection source. Therefore, the signal analysis module 40 is further configured to determine the phase characteristic according to the echo signal. The reflection source of the echo signal, specifically:

1. Analyze the reflection of the carrier signal in the space to be tested:

It can be understood that the space to be tested may be a living area such as a living room in a home or a waiting room of a station. Therefore, the carrier signal emitted by the electromagnetic wave transmitting probe 20 will be subjected to three major categories in the process of transmitting in the space to be tested. Reflection of obstacles: building structures such as walls, stationary objects such as cabinets, and human bodies. Among them, the first two types of obstacles are stationary objects, and the movement of the human body The status is uncertain. Since the three types of obstacles in the space to be tested reflect the carrier signal, the echo signals generated by these obstacles include heart rate signals and other interference signals generated by the human body.

Preferably, the electromagnetic wave transmitting probe 20 emits electromagnetic waves using a frequency modulated carrier, the frequency of the frequency modulated carrier is 5.25 GHz to 7.25 GHz, and the transmission period of the frequency modulated carrier is 2 milliseconds.

2. Analyze the echo signals generated by different obstacles:

In this embodiment, the reflected carrier signal is divided into different regions according to the reflection time of the carrier signal, wherein the reflection time can be determined by the difference between the transmission timing of the carrier signal and the received reception time of the carrier signal.

Preferably, when the two objects are less than 10 cm apart, the corresponding reflected carrier signal is divided into the same area, and when the two objects are separated by more than or equal to 10 cm, the corresponding reflected carrier signal is obtained. Divided into different regions, wherein the distance between the two objects for determination can be determined according to the scenario to which the embodiment is applied, for example, when the space in the scene region is small, and there are many scraps, such as in a room, The distance is appropriately reduced, and for example, when the space in the scene area is large, such as at a station or other outdoor scene, the distance can be appropriately increased.

The processing method of the segmentation area can realize the distinction between different obstacles. At the same time, the processing method of the segmentation area can also distinguish the reflection signals of different human bodies, so as to achieve simultaneous measurement by multiple people.

3. Extract the echo signals generated by the human body from the echo signals generated by different obstacles:

First of all, we need to understand that the echo signal of a stationary object is usually time-invariant, and the echo signal generated by the human body due to its own motion, respiratory rhythm, etc., is usually time-varying.

Secondly, in the human body that is almost stationary, such as working in front of a desk, sleeping, watching TV, etc., the echo signal changes little; the moving human body, such as walking, swinging arms, etc., due to the sporadic movement, will make Regular echo signals produce mutations.

Therefore, according to whether the echo signal has a small range change and a mutation, the moving human body and the stationary human body can be further identified.

4. Extract each person's echo signal from the echo signal generated by the human body:

In this embodiment, the phase of the echo signal is used to determine the discrimination of different human bodies.

First, define the signal phase as

Where d(t) represents the transmission distance of the echo and λ represents the wavelength of the detected wave.

Preferably, the wavelength used in this embodiment is 5 cm.

When the phase of the echo signal received by the echo signal acquisition probe 30 changes within a certain range and a relatively periodic change occurs, the echo signal can be considered to be reflected back by the same human body. It can be understood that if the phases of the N sets of signals in the echo signal are varied within a certain range thereof, the echo signals corresponding to the N individuals in the space to be tested can be respectively determined.

5. Analyze each person's echo signal to obtain heart rate measurement data for each person:

The processing method adopted in this embodiment is that the Fourier transform is first used to extract the time domain waveform in a specific frequency band; then, the digital filter is used to filter the waveform in the specific frequency band to remove noise. specific:

a, window processing on the echo carrier, the window length is 30 seconds;

b, performing Fourier transform on the data in the window to obtain a frequency domain representation corresponding to the waveform;

c. The frequency band in which the heart rate is located is a reserved frequency band, and the inverse Fourier transform is performed on the signal in the reserved frequency band to obtain a time domain signal corresponding to the reserved frequency band;

d. digitally filtering the time domain signal to obtain a clean ECG signal;

e. Using the peak detection method, the heart rate data is extracted from the ECG signal.

The beneficial effect of the embodiment is that by using the electromagnetic wave echo signal to simultaneously detect and analyze the multi-person heart rate, the heart rate and the photoelectric method can be avoided to measure the heart rate deficiency, and a non-intrusive measuring device is provided, which eliminates the user to be tested. The inconvenience of wearing is convenient for test deployment. The present embodiment is applicable to an environment such as a home or a workplace, and can perform heart rate measurement operations on multiple people simultaneously in a self-determined, accurate, real-time, and non-sensing situation. Taking the heart rate band as the benchmark, the accuracy of this program is within plus or minus 5%, and the accuracy rate is high.

Embodiment 2

The second embodiment of the present invention provides a second preferred embodiment of the heart rate detecting device. FIG. 2 is a schematic structural view of a second embodiment of the heart rate measuring device according to an embodiment of the present invention.

Referring to FIG. 2, a heart rate measuring device provided by this embodiment differs from Embodiment 1 in that the internal oscillation module 10 of the present embodiment includes an oscillator 11 and a matching circuit 12, wherein the oscillator 10 is used to generate An AC signal, the matching circuit 12 is configured to generate an electromagnetic wave of the fixed frequency band according to the AC signal.

Embodiment 3

The third embodiment of the present invention provides a third preferred embodiment of the heart rate detecting device. FIG. 3 is a schematic structural view of a third embodiment of the heart rate measuring device according to the embodiment of the present invention.

Referring to FIG. 3, a heart rate measuring device provided by this embodiment differs from Embodiment 1 in that the signal analyzing module 40 of the present embodiment includes a micro processing unit 41, a sampling unit 42, an amplifying unit 43, and a filtering unit 44. The micro processing unit 41 is configured to execute a signal analysis instruction according to a specific timing, the sampling unit 42 is configured to perform sampling processing on the echo signal, to obtain a sampling signal, the amplifying unit 43 is configured to perform amplification processing on the sampling signal, and the filtering unit 44 is configured to Remove noise within a specific waveform.

Embodiment 4

The fourth embodiment of the present invention provides a fourth preferred embodiment of the heart rate detecting method. FIG. 4 is a flowchart of a fourth embodiment of the heart rate measuring method according to an embodiment of the present invention.

Referring to FIG. 4, a heart rate measurement method provided by this embodiment includes:

S1, an electromagnetic wave is generated by the internal oscillation module 10;

S2. The electromagnetic wave transmitting probe 20 emits electromagnetic waves to the area to be tested;

S3, the echo signal acquisition probe 30 receives the echo signal reflected by the reflection source, and sends the echo signal to the signal analysis module 40;

S4. The signal analysis module 40 extracts an ECG signal according to the echo signal, and obtains heart rate measurement data according to the ECG signal.

It can be understood that each module involved in the method steps of the embodiment may be integrated into one housing, and constitute a heart rate measuring device with a matching power module, a communication module and the like. The device can be placed in a public place to test the heart rate of the human body in the coverage area, for example, a school, a hospital, a station, etc., or can be set in a home for detecting heart rate data of family members.

The beneficial effect of the embodiment is that by using the electromagnetic wave echo signal to simultaneously detect and analyze the multi-person heart rate, the heart rate and the photoelectric method can be avoided to measure the heart rate deficiency, and a non-intrusive measuring device is provided, thereby eliminating the user to be tested. The inconvenience of wearing is convenient for test deployment. The present embodiment is applicable to an environment such as a home or a workplace, and can perform heart rate measurement operations on multiple people simultaneously in a self-determined, accurate, real-time, and non-sensing situation.

Embodiment 5

The fifth embodiment of the present invention provides a fifth preferred embodiment of the heart rate detecting method. FIG. 5 is a flowchart of a fifth embodiment of the heart rate measuring method according to an embodiment of the present invention.

Referring to FIG. 5, a heart rate measurement method provided by this embodiment differs from Embodiment 4 in that the signal analysis module 40 extracts an ECG signal according to an echo signal, and obtains heart rate measurement data according to the ECG signal, including:

S41. Determine a reflection time of the electromagnetic wave according to a transmission time of the carrier signal and a reception time of the echo signal.

It can be understood that the space to be tested may be a living area such as a living room in a home or a waiting room of a station. Therefore, the carrier signal emitted by the electromagnetic wave transmitting probe 20 will be subjected to three major categories in the process of transmitting in the space to be tested. Reflection of obstacles: building structures such as walls, stationary objects such as cabinets, and human bodies. Among them, the first two types of obstacles are stationary objects, and the movement state of the human body is uncertain. Since the three types of obstacles in the space to be tested reflect the carrier signal, the echo signals generated by these obstacles include heart rate signals and other interference signals generated by the human body.

The beneficial effect of this embodiment is that the reflection of the carrier signal in the space to be tested can be analyzed.

Embodiment 6

The sixth embodiment of the present invention provides a sixth preferred embodiment of the heart rate detecting method. FIG. 6 is a flowchart of a sixth embodiment of the heart rate measuring method according to an embodiment of the present invention.

Referring to FIG. 6 , a heart rate measurement method provided by this embodiment is different from Embodiment 5 in that the signal analysis module 40 extracts an ECG signal according to an echo signal, and obtains heart rate measurement data according to the ECG signal, and further includes:

S42. Divide the carrier signal into different regions according to the reflection time to distinguish echo signals generated by different obstacles and different human bodies.

The beneficial effect of the embodiment is that the processing manner of the segmentation area can realize the distinction between different obstacles. At the same time, the processing manner of the segmentation area can also distinguish the reflection signals of different human bodies, so as to achieve simultaneous measurement by multiple people.

Example 7

The seventh embodiment of the present invention provides a seventh preferred embodiment of the heart rate detecting method. FIG. 7 is a flowchart of a seventh embodiment of the heart rate measuring method according to an embodiment of the present invention.

Referring to FIG. 7, a heart rate measurement method provided by this embodiment is different from Embodiment 6. The signal analysis module 40 extracts the ECG signal according to the echo signal, and obtains the heart rate measurement data according to the ECG signal, and further includes:

S43. Determine a reflection source that generates the echo signal according to a phase characteristic of the echo signal, and determine heart rate data according to an echo signal of the reflection source.

1. Determining a reflection source that generates the echo signal according to a phase characteristic of the echo signal:

Finally, each person's echo signal is extracted from the echo signal generated by the human body:

First, define the signal phase as

Preferably, the wavelength used in this embodiment is 5 cm.

2. Determine heart rate data based on the echo signals of the reflected source:

Specifically, analyze each person's echo signal to obtain heart rate measurement data for each person:

The processing method adopted in this embodiment is that the Fourier transform is first used to extract the time domain waveform in a specific frequency band; then, the digital filter is used to perform the waveform in the specific frequency band. Filter to remove noise. specific:

a, window processing on the echo carrier, the window length is 30 seconds;

d. digitally filtering the time domain signal to obtain a clean ECG signal;

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims

A heart rate measuring device, comprising: an internal oscillation module, an electromagnetic wave transmitting probe, an echo signal collecting probe, and a signal analyzing module, wherein:

The internal oscillation module is configured to generate electromagnetic waves in a fixed frequency band;

The electromagnetic wave transmitting probe is configured to emit the electromagnetic wave to an area to be tested;

The echo signal acquisition probe is configured to receive an echo signal reflected by the reflection source, and send the echo signal to the signal analysis module;

The signal analysis module is configured to extract an ECG signal according to the echo signal, and obtain heart rate measurement data according to the ECG signal.
The apparatus according to claim 1, wherein said internal oscillation module comprises an oscillator and a companion circuit, wherein said oscillator is for generating an AC signal, and said companion circuit is for generating an AC signal according to said AC signal The electromagnetic wave of the fixed frequency band.
The apparatus according to claim 1, wherein said electromagnetic wave transmitting probe transmits said electromagnetic wave using a frequency modulated carrier, said frequency modulation carrier having a transmission frequency of 5.25 GHz to 7.25 GHz, said frequency modulation carrier transmitting period It is 2 milliseconds.
The apparatus according to claim 1, wherein the signal analysis module comprises a micro processing unit, a sampling unit, an amplifying unit, and a filtering unit, wherein the micro processing unit is configured to execute a signal analysis instruction according to a specific timing. The sampling unit is configured to perform sampling processing on the echo signal to obtain a sampling signal, the amplifying unit is configured to perform an amplification process on the sampling signal, and the filtering unit is configured to remove noise in a specific waveform.
The apparatus according to claim 4, wherein said signal analysis module further comprises a phase analyzing unit, said phase analyzing unit configured to determine a reflection source for generating said echo signal based on a phase characteristic of said echo signal .
A heart rate detecting method, comprising:

Electromagnetic waves are generated by an internal oscillation module;

An electromagnetic wave transmitting probe emits the electromagnetic wave to an area to be tested;

The echo signal acquisition probe receives the echo signal reflected by the reflection source, and sends the echo signal to the signal analysis module;

The signal analysis module extracts an electrocardiographic signal according to the echo signal, and obtains heart rate measurement data according to the ECG signal.
The method according to claim 6, wherein the electromagnetic wave transmitting probe transmits the electromagnetic wave to the area to be tested comprises:

The electromagnetic wave transmitting probe transmits the electromagnetic wave by using a frequency modulation carrier. The frequency modulation carrier has a transmission frequency of 5.25 GHz to 7.25 GHz, and the frequency modulation carrier has a transmission period of 2 milliseconds.
The method according to claim 7, wherein the signal analysis module extracts an electrocardiographic signal according to the echo signal, and obtains heart rate measurement data according to the ECG signal, including:

The reflection time of the electromagnetic wave is determined according to a transmission time of the carrier signal and a reception time of the echo signal.
The method according to claim 8, wherein the signal analysis module extracts an electrocardiographic signal according to the echo signal, and obtains heart rate measurement data according to the ECG signal, further comprising:

The carrier signal is divided into different regions according to the reflection time to distinguish echo signals generated by different obstacles and different human bodies.
The method according to claim 9, wherein the signal analysis module extracts an electrocardiographic signal according to the echo signal, and obtains heart rate measurement data according to the ECG signal, further comprising:

A reflection source that generates the echo signal is determined according to a phase characteristic of the echo signal, and heart rate data is determined according to an echo signal of the reflection source.