KR20200080755A - Biometric wave based heart rate measurement apparatus using movement sensor and method thereof - Google Patents

Abstract

The present invention relates to a heart rate measurement device using a biometric wave such as an electrocardiogram, a pulse wave and the like, and a method thereof. More specifically, the present invention relates to a biometric wave based heart rate measurement device using a movement sensor and a method thereof. Motion noise is measured by at least one of an accelerometer sensor and a pressure sensor and the motion noise included in the biometric wave is removed by using the motion noise measured by the accelerometer sensor and the pressure sensor to extract only pure biological waves and measure a heart rate by the pure biological waves.

Description

Biometric wave based heart rate measurement apparatus using movement sensor and method thereof

The present invention relates to an apparatus and method for measuring a heart rate using an electrocardiogram, pulse wave, or the like (hereinafter, the term "biowave" is used as a term including both the electrocardiogram and pulse wave), and more specifically, an accelerometer sensor and The motion noise is measured by any one or more of the pressure sensors, and the motion noise included in the biowave is removed using the motion noise measured by the acceleration sensor and the pressure sensor, and only pure biowave is extracted. The present invention relates to an apparatus and method for measuring a heart rate based on a biowave using a motion sensor for measuring a heart rate.

Heart rate (HR) is the most basic information of human health information, and is an important information that can monitor body changes in a situation where interest in health is continuously increasing.

Heart rate refers to the number of heart beats and is consistent with the pulse rate normally felt by the radial artery.

Therefore, as a method for measuring the heart rate, an electrocardiogram measurement method using an electrocardiogram (ECG) according to the active current generated in the myocardium according to the heartbeat and a PPG (Photoplethysmogram) according to the pressure in the blood vessel caused by blood flow from the radial artery : Light volume pulse wave, hereinafter referred to as "pulse wave").

Recently, heart rate measuring devices to which such an electrocardiogram using method and a pulse wave using measuring method are applied have been developed and commercialized. The heart rate measuring device is configured in various forms such as a band type or a clock type so as to contact the user's body.

As described above, the heart rate measuring device is configured to contact the user's body, and it is necessary to measure either the electrocardiogram or the pulse wave in a situation where the user is moving. There was.

In other words, for accuracy, the ECG and pulse wave must be measured while the user is not moving, but this has a problem that cannot meet the user's demand for continuously measuring the heart rate of the user for portable and exercise use.

Registered Patent Publication No. 10-1850803 (Apr. 20, 2018)

Accordingly, an object of the present invention is to measure motion noise by any one or more of an accelerometer sensor and a pressure sensor, and remove motion noise included in the biowave by using motion noise measured by an acceleration sensor and a pressure sensor. Disclosed is a biowave-based heart rate measuring apparatus and method using a motion sensor that extracts only pure biowave and measures heart rate by pure biowave.

Bio-wave-based heart rate measuring apparatus using a motion sensor according to the present invention for achieving the above object is attached to the user's body, a bio-wave measurement unit for measuring and outputting bio-waves for bio-signals generated from the user; A motion noise detector for detecting and outputting motion noise according to the user's movement; And a controller configured to receive the bio-wave and motion noise, filter the bio-wave into the motion noise, remove motion noise included in the bio-wave, and calculate a heart rate by the bio-wave from which the motion noise is removed. It is characterized by.

The biowave measurement unit may include an electrocardiogram measurement unit configured to output an electrocardiogram waveform measuring a user's electrocardiogram with the biowave; And it characterized in that it comprises at least one of a pulse wave measuring unit for outputting the user's pulse wave waveform as the bio-wave.

The control unit may include a bio-wave acquisition unit for obtaining and outputting bio-waves through the bio-wave measurement unit; A motion noise acquiring unit for acquiring and outputting motion noise through the motion noise measuring unit; A filtering unit that removes and outputs motion noise included in the biowave output from the biowave acquisition unit as the motion noise output from the motion noise acquisition unit; And it characterized in that it comprises a heart rate calculation unit for calculating the heart rate by the living wave from which the motion noise is removed.

The motion noise detection unit includes: an acceleration measurement unit including an acceleration sensor that measures and outputs acceleration, which is motion information according to a user's movement; And a pressure measuring unit including a pressure sensor that measures and outputs pressure, which is motion information according to a user's fine movement, and the operation noise acquisition unit of the control unit acquires at least one or more of the acceleration and pressure to the filtering unit. Outputting, the filtering unit is characterized in that it outputs by removing the operating noise from the bio-wave input by any one or more of the input acceleration and pressure.

The pressure sensor is characterized in that the piezo sensor.

To achieve the above object, a method for measuring heart rate based on a biowave using a motion sensor according to the present invention includes: a biowave acquisition process in which a control unit acquires a biowave of a user through the biowave measurement unit; A motion noise detection process in which the controller detects motion noise according to the user's movement; A motion noise removing process in which the controller filters the biowaves by the motion noise to remove motion noise included in the biowave; And a heart rate measurement process in which the control unit measures the heart rate by the living wave from which the motion noise is removed.

The bio-wave acquisition process includes: an electrocardiogram waveform acquisition step of acquiring an electrocardiogram waveform obtained by measuring the user's electrocardiogram with the bio-wave; And a pulse wave acquiring step of acquiring the pulse wave of the user with the biowave.

The operation noise detection process includes: an acceleration detection step in which the control unit detects acceleration with operation noise according to a user's large operation through an acceleration measurement unit; And a pressure detection step in which the control unit detects a pressure according to a user's fine motion as a motion noise through a piezo sensor of the pressure measurement unit.

The filtering process may include determining an operation noise type to determine which one or more of acceleration and pressure is detected through at least one of the acceleration detection step and the pressure detection step; And a filtering step of filtering the bio-waves with one or more motion noises of the detected acceleration and pressure.

The present invention has the effect of measuring a more accurate heart rate because the motion noise generated by the movement of the user measuring the heart rate by the motion sensor can be removed from the living wave.

In particular, the present invention uses an pressure sensor as well as an accelerometer, so it can remove even minute motion noise caused by a user's finer motion, and thus has an effect of measuring a more accurate heart rate.

1 is a view showing the configuration of a bio-wave-based heart rate measuring apparatus using a motion sensor according to the present invention.
2 is a flowchart illustrating a method for measuring a heart rate based on a biowave using a motion sensor according to the present invention.
3 is a view showing a biowave waveform in a frequency domain according to the removal of motion noise and motion noise including motion noise according to a user's hand movement according to an embodiment of the present invention.
4 is a view showing a biowave waveform in a frequency domain according to the removal of motion noise and motion noise including fine motion noise according to a user's finger movement according to an embodiment of the present invention.

Hereinafter, a configuration and operation of a biowave-based heart rate measuring apparatus using a motion sensor according to the present invention will be described in detail with reference to the accompanying drawings, and a method for measuring heart rate in the device will be described.

1 is a view showing the configuration of a bio-wave-based heart rate measuring apparatus using a motion sensor according to the present invention.

The biowave-based heart rate measuring apparatus using the motion sensor according to the present invention includes a storage unit 10, a display unit 20, an input unit 30, a bio-wave measurement unit 40, a motion noise detection unit 50 and a control unit 60 ).

The storage unit 10 is a program area for storing a control program for controlling the overall operation of the heart rate measuring apparatus according to the present invention, a temporary area for temporarily storing data generated during the execution of the control program, and data necessary for performing the control program And a data area that semi-permanently stores data generated during the execution of the control program. The temporary region may include regions capable of buffering biowaves, acceleration and pressure, respectively. In addition, the biowave, acceleration and pressure may be stored in the data area.

The display unit 20 is controlled by the control unit 60 to display various information as one or more of graphics, still images, and videos including text and icons. In accordance with the present invention, the filtered live wave may be displayed on the display unit 20, and the measured heart rate may be displayed.

The input unit 30 is integrally configured with a button input device including a plurality of buttons for controlling functions and operations according to the present invention and a screen of the display unit 20 and outputs a position signal corresponding to a touched position. It may include a touch pad, a rotation input device configured to be rotatable and outputting a control signal according to the rotation direction and rotation angle.

The biowave measurement unit 40 is in contact with a user's wrist, neck, heart, etc., and is in contact with the user's wrist, neck, etc., which measures the user's electrocardiogram and outputs an electrocardiogram waveform according to the electrocardiogram. It includes any one or more of the pulse wave measuring unit 42 for measuring the user's pulse and outputting the pulse wave.

The motion noise detection unit 50 includes an acceleration measurement unit 51 and a pressure measurement unit 52. The motion noise detection unit 50 may be composed of only one of the acceleration measurement unit 51 and the pressure measurement unit 52. In this case, it may be desirable to configure a pressure measuring unit 52 capable of detecting a finer movement, such as muscle movement.

The acceleration measurement unit 51 includes an accelerometer sensor, measures acceleration by a user's body movement, and outputs it as motion noise.

The pressure measurement unit 52 includes a pressure sensor to detect pressure according to the movement of the user's body muscles and outputs the motion noise. The pressure sensor may be a piezo sensor or the like.

The control unit 60 includes a biowave acquisition unit 61, a motion noise acquisition unit 62, a filtering unit 63, and a heart rate calculation unit 66, the overall operation of the biowave-based heart rate measuring apparatus according to the present invention Control.

Specifically, the bio-wave acquisition unit 61 acquires any one of the ECG waveform and the pulse wave waveform through the bio-wave measurement unit 40 and outputs it to the filtering unit 63.

The motion noise acquiring unit 62 acquires any one or more of acceleration and pressure that are motion noise through at least one of the acceleration measurement unit 51 and the pressure measurement unit 52 of the motion noise detection unit 50 to filter (63).

The filtering unit 63 includes at least one of an acceleration operation noise filtering unit 64 and a pressure operation noise filtering unit 65 depending on whether the operation noise detection unit 50 is configured.

The acceleration motion noise filtering unit 64 receives the biowaves and motion noises that are accelerations, and filters and outputs the biowaves as motion noise for acceleration.

The pressure operation noise filtering unit 65 receives a biowave from the biowave acquisition unit 61 and receives a pressure operation noise that is a pressure operation noise from the motion noise acquisition unit 62, and the pressure operation noise is the The biological wave is filtered and output to the heart rate calculator 66, or the first filtered biological wave from the acceleration motion noise filter 64 is filtered with the pressure motion noise to be output to the heart rate calculator 66. .

The heart rate calculation unit 66 measures the heart rate based on the biowaves input from the filtering unit 63.

2 is a flowchart illustrating a method for measuring a heart rate based on a biowave using a motion sensor according to the present invention.

Referring to FIG. 2, first, the control unit 60 checks whether a biowave measurement start event is generated (S111). The biowave measurement start event may be generated by the input unit 30 or may be periodically generated according to preset information.

When the biowave measurement start event occurs, the control unit 60 drives the biowave measurement unit 40 and the motion noise detection unit 50 (S113, S115).

When the bio-wave measurement unit 40 and the companion noise detection unit 50 are driven, the control unit 60 checks whether bio-waves are input from the bio-wave measurement unit 40 (S117), and buffers when the bio-waves are input. (S119).

When the living wave is buffered, the control unit 60 monitors whether any one or more of the first motion noise and the second motion noise is detected through the motion noise detection unit 50 (S121, S123, S125). The first motion noise is an acceleration motion noise, and the second motion noise is a pressure motion noise.

If only the acceleration motion noise is detected, the controller 60 filters and outputs the biowaves only with the acceleration motion noise (S127). However, practically no case where only the acceleration motion noise is detected will be generated.

When only the pressure operation noise is detected, the control unit 60 filters the biowaves only by the pressure operation noise (S129).

When both the acceleration motion noise and the pressure motion noise are detected, the controller 60 performs primary filtering with the acceleration motion noise (S131) and then performs secondary filtering with the pressure motion noise (S133).

In addition, if both the acceleration motion noise and the pressure motion noise are not detected, the controller 60 does not filter the biological wave (S135).

As described above, when the filtering process is finished, the controller 60 calculates the heart rate based on the filtered biowave or biowave without motion noise (S137).

FIG. 3 is a view showing a biowave waveform in a frequency domain according to the removal of motion noise and motion noise including motion noise according to a user's hand motion according to an embodiment of the present invention. It is a diagram showing waveforms related to motion noise caused by.

Referring to FIG. 3, 301 is a periodic diagram of a pulse wave, which is a biological wave when a user moves by repetitive motions of holding and releasing hands, that is, a waveform diagram, to calculate the motion noise 311 and heart rate according to the user's movement at 60 BPM It shows that the pulse wave 312 for a mixture is 100BPM.

302 shows the periodicity measured by the acceleration sensor of the acceleration measurement unit 51, and the motion noise 311 that is held and released at 60 BPM is not detected. Therefore, the control unit 60 cannot remove the motion noise 311 by applying the acceleration sensor waveform of 302 from the pulse wave waveform diagram 301.

On the other hand, 303 indicates a periodic diagram, that is, a waveform diagram, measured by the pressure sensor of the pressure measuring unit 52, and the operation noise 311 is detected in an area corresponding to 60 BPM of the operation noise 311 of 301. Accordingly, the control unit 60 may remove the operation noise 311 of 301 by the operation noise 311 of 303.

3, 304 is a pulse wave waveform as a result of filtering by 302, and indicates that an error occurs because the motion noise 311 according to a user's movement is recognized as a pulse wave to measure the heart rate.

On the other hand, 305 of FIG. 3 filters 301 to 303, so that the motion noise 311 is reliably removed to accurately recognize a signal of 100 BMP, which is an accurate pulse wave, as a pulse wave for measuring a heart rate.

FIG. 4 is a diagram showing a biowave waveform in a frequency domain according to the removal of motion noise and a motion wave including fine motion noise according to a user's finger motion according to an embodiment of the present invention. It shows the removal of motion noise by the acceleration sensor and the motion noise process by the pressure sensor as a periodic diagram.

Specifically, 401 of FIG. 4 shows a biowave measured through the biowave measurement unit 40, and there is a pulse wave 412 in the frequency domain 100BPM, and the motion noise 411 due to a user's finger striking motion at 60BPM. This indicates the existence.

At this time, the acceleration measurement unit 51 outputs an acceleration periodogram such as 402, and the pressure measurement unit 52 outputs a pressure periodogram such as 403.

As shown in 402, the motion noise 411 is not detected in the 60BMP region as shown in the acceleration period diagram.

On the other hand, 403 indicates that the motion noise 411 is detected at 60 BMP.

404 shows a case where the pulse wave waveform of 401 is filtered by applying 402, and indicates that the motion noise 411 of 60 BPM is recognized as a pulse wave to measure the heart rate. Therefore, an error will occur in this case.

However, 405 indicates that when filtering is performed by applying 403, the motion noise 411 of 60 BPM is accurately removed to recognize the pulse wave 312 of 100 BPM as the pulse wave 322 to measure the heart rate.

3 and 4 show motion noises caused by fine movements and show cases where motion noises are removed only by a pressure waveform.

Although not shown in a waveform diagram as in FIGS. 3 and 4, it is possible to remove motion noise even by an acceleration waveform in a large movement.

On the other hand, the present invention is not limited to only the typical preferred embodiments described above, but can be carried out by improving, changing, replacing or adding in various ways without departing from the gist of the present invention. Anyone who has a will easily understand. If the implementation by such improvement, modification, replacement, or addition falls within the scope of the appended claims, the technical idea should also be regarded as belonging to the present invention.

10: storage unit 20: display unit
30: input unit 40: bio-wave measurement unit
41: electrocardiogram measurement unit 42: pulse wave measurement unit
50: motion noise detection unit 51: acceleration measurement unit
52: pressure measuring unit 60: control unit
61: bio-wave acquisition unit 62: motion noise acquisition unit
63: filtering unit 64: acceleration motion noise filtering unit
65: pressure operation noise filtering unit 66: heart rate calculation unit

Claims (9)

A bio-wave measurement unit attached to the user's body and measuring and outputting bio-waves for the bio-signals generated from the user;
A motion noise detector for detecting and outputting motion noise according to the user's movement; And
And a controller configured to receive the bio-wave and motion noise, filter the bio-wave into the motion noise, remove motion noise included in the bio-wave, and calculate a heart rate by the bio-wave from which the motion noise is removed. Biowave-based heart rate measuring device using a motion sensor characterized by.
According to claim 1,
The bio-wave measurement unit,
An electrocardiogram measurement unit for outputting an electrocardiogram waveform measuring the user's electrocardiogram with the biowave; And
Biowave-based heart rate measuring apparatus using a motion sensor, characterized in that it comprises at least one of a pulse wave measurement unit for outputting the user's pulse wave waveform as the bio-wave.
According to claim 1,
The control unit,
A biowave acquisition unit for obtaining and outputting biowaves through the biowave measurement unit;
A motion noise acquiring unit for acquiring and outputting motion noise through the motion noise measuring unit;
A filtering unit which removes and outputs motion noise included in the biowave output from the biowave acquisition unit as the motion noise output from the motion noise acquisition unit; And
Bio-wave-based heart rate measuring apparatus using a motion sensor, characterized in that it comprises a heart rate calculator for calculating the heart rate by the living wave is the motion noise is removed.
According to claim 3,
The motion noise detection unit,
An acceleration measurement unit including an acceleration sensor that measures and outputs acceleration, which is motion information according to a user's movement; And
It includes a pressure measuring unit including a pressure sensor for measuring and outputting the motion information according to the user's fine movement,
The operation noise acquisition unit of the control unit,
Acquiring at least one or more of the acceleration and pressure to output to the filtering unit,
The filtering unit
A biowave-based heart rate measuring apparatus using a motion sensor, characterized in that motion noise is removed and output from the biowave inputted by any one or more of the input acceleration and pressure.
According to claim 4,
The pressure sensor,
Bio-wave-based heart rate measuring apparatus using a motion sensor, characterized in that the piezo sensor.
A bio-wave acquisition process in which the control unit acquires the bio-wave of the user through the bio-wave measurement unit;
A motion noise detection process in which the controller detects motion noise according to the user's movement;
A motion noise removing process in which the controller filters the biowaves by the motion noise to remove motion noise included in the biowave; And
A method for measuring a heart rate based on a living wave using a motion sensor, characterized in that the controller includes a heart rate measurement process for measuring a heart rate by the living body wave from which the motion noise is removed.
The method of claim 6,
The bio-wave acquisition process,
An electrocardiogram waveform acquiring step of acquiring an electrocardiogram waveform measuring the electrocardiogram of the user with the biowave; And
Biowave-based heart rate measurement method using a motion sensor, characterized in that it comprises any one of the pulse wave acquisition step of acquiring the pulse wave of the user with the biowave.
The method of claim 6,
The motion noise detection process,
An acceleration detection step in which the control unit detects the acceleration with the motion noise according to the user's large movement through the acceleration measurement unit; And
The control unit comprises a pressure detection step of detecting a pressure according to the user's micro-motion through the piezo sensor of the pressure measuring unit as a motion noise, characterized in that the biowave-based heart rate measurement method using a motion sensor.
The method of claim 8,
The filtering process,
An operation noise type determining step of determining which one or more of acceleration and pressure is detected through one or more of the acceleration detection step and the pressure detection step; And
And a filtering step of filtering the living wave with one or more motion noises of the detected acceleration and pressure.

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