CN103027684B - For removing the apparatus and method of the noise caused in respiratory movement is monitored by body kinematics - Google Patents
For removing the apparatus and method of the noise caused in respiratory movement is monitored by body kinematics Download PDFInfo
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Abstract
The invention provides a kind of device for removing the noise caused in respiratory movement is monitored by body kinematics, comprising: at least two accelerometer, the first accelerometer in this at least two accelerometer and the second accelerometer are placed on the health opposite side of abdominal part or chest region；And processing unit, it produces do not have noisy acceleration signal Vacc for acceleration signal components Ax, Ay and the Az according to the acceleration signal components Ax, Ay and the Az that are obtained by the first accelerometer and by the second accelerometer acquisition.Assembly of the invention makes the noise caused by body kinematics in monitoring of respiration to be removed, and respiratory movement can be enhanced, thus respiratory movement monitoring can be more efficient and sensitive.
Description
Technical field
The present invention relates to respiratory movement monitoring, and particularly in monitoring in respiratory movement by utilizing the accelerometer of complementation to remove the apparatus and method of the noise caused due to body kinematics.
Background technology
Obstructive sleep apnea (OSA) is a kind of disorderly, and this disorder is characterised by the repeatability outbreak that the asphyxia caused during sleeping or suction airflow reduce due to upper respiratory tract obstruction.Polysomnography (PSG), be otherwise known as sleep study, is a kind of multi-parameters test used in sleep study, and as the diagnostic tool in sleep medical treatment.Portable and easy-to-use monitoring equipment can be a kind of replacement as PSG, diagnosis for less precision, and typically measuring four physiological parameters via pulse oximeter, these four physiological parameters include two and breathe variable (such as respiratory movement and air-flow), heart variable (such as heart rate or electrocardiogram) and arterial oxygen haemachrome saturation.Some equipment have can detect snoring, determine body position or the additional signal of detection motion.
Routinely, it is possible to by bringing abdominal part and the chest movable signal of monitoring reflection respiratory movement or effort around the sensing of chest.Now, accelerometer sensor used also as this purposes because it have easily wear, sensitive and it also be able to measure body gesture.Triaxial accelerometer is the equipment measuring the acceleration three orthogonal directions (sensitive axis).This sensor is placed on the top of the diaphragm area expanded along with air-breathing and expiration and shrink.
Such as, in PCT International Application Serial No. PCT/GB02/03302 that title is " RESPIRATIONANDHEARTRATEMONITOR ", provide the breathing rate monitor of a kind of breathing rate for measuring health, this monitor includes adsorbable in upper body part and be arranged at least one accelerometer providing the accelerometer relevant with the breathing rate of health to export signal, and be used for determining described breathing rate and for providing the module of the monitor output representing respiratory frequency according to accelerometer output signal, this module includes for exporting the baseline filter removing the not artifact of health breathing result in signal from accelerometer, to provide the background signal after removing.
But, during monitoring OSA or the sleep of other respiratory disorders or daily breathing, the body kinematics such as similar rotation, walking will cause other acceleration to be added in movement of thorax signal.It is difficult for removing these noises, even if by wave filter, and therefore these noises will affect certainty of measurement.
Summary of the invention
In view of the problems referred to above of the prior art, present inventors have realized that and need a kind of apparatus and method for removing the noise caused by body kinematics in respiratory movement is monitored.
It is well known in the art that the output signal in conventional single accelerometer solution is made up of two parts, i.e. part instruction respiratory movement and another part instruction body kinematics.It is difficult in the output signal distinguish the two part, here it is why conventional single accelerometer solution can not remove the noise caused by body kinematics effectively, even can not by wave filter.
The inventors found that, if introducing with reference to (namely, second) accelerometer and be placed on the health identical with the first accelerometer, so, because the operation principle according to accelerometer, part including the instruction body kinematics in the output signal of the second accelerometer is identical with that part included in the output signal of the first accelerometer, it is possible to easily passes through the part eliminating instruction body kinematics from these two output signals and removes the noise caused by body kinematics.
But, it is impossible to optionally place this two accelerometers.Such as, if two accelerometers are placed on the same side of health, remain able to be removed although by the noise caused by body kinematics, but useful information, namely indicate respirometric part, it is also possible to be adversely affected.Therefore, the measurement result that thoracic cavity expands or shrinks is likely to be adversely affected, and particularly when two accelerometers are close to each other, also can remove in signal from respiratory part this is because subtract each other.
Therefore, the present invention proposes the apparatus and method of two complementary accelerometers that a kind of use is placed on the health opposite side of abdominal part or chest region.When whole body moves with same direction; when similar walking or other daily routines; the accelerometer of the two complementation will export identical signal; and they are by the opposite signal of output reflection abdominal part or chest exercise (such as respiratory movement); this is because when the two accelerometer is placed to health opposite side, thoracic cavity can be expanded or shrink and give the signal that accelerometer is contrary.
By utilizing according to assembly of the invention, it is possible to remove the noise caused by body kinematics and enhancing signal can indicate respirometric part.
Specifically, according to an aspect of the present invention, provide a kind of device for removing the noise caused in respiratory movement is monitored by body kinematics, comprising: at least two accelerometer, the first accelerometer and the second accelerometer in this at least two accelerometer are placed on the health opposite side of abdominal part or chest region；And processing unit, it is for according to the acceleration signal components Ax, Ay and the Az that are obtained by the first accelerometer and the acceleration signal components Ax, Ay and the Az that are obtained by the second accelerometer, producing do not have noisy acceleration signal Vacc.
Because adopt the first accelerometer and the second accelerometer according to assembly of the invention, and unlike monitoring, only with an accelerometer, the conventional solution that respiratory movement is made great efforts, it is possible to eliminate or remove the noise caused by body kinematics.
It addition, because the first accelerometer and the second accelerometer are placed on the health opposite side of abdominal part or chest region, it is possible to enhancing signal indicates respirometric part, and therefore respiratory movement monitoring can be more efficient and sensitive.
As to how acceleration signal components Ax, Ay and the Az of place's reason the first accelerometer acquisition and acceleration signal components Ax, Ay and Az by the second accelerometer acquisition, to produce do not have noisy acceleration signal Vacc, it is possible to adopt at least following two algorithm.
Such as, according to embodiments of the invention, processing unit can produce do not have noisy acceleration signal Vacc in the following manner: synthesizes the first acceleration signal V1acc from acceleration signal components Ax, Ay and Az that the first accelerometer obtains；The acceleration signal components Ax, Ay and the Az that obtain from the second accelerometer synthesize the second acceleration signal V2acc；Acceleration signal Vacc is produced by deducting the first acceleration signal V1acc from the second acceleration signal V2acc.
According to other embodiments of the present invention, processing unit can produce do not have noisy acceleration signal Vacc in the following manner: in the x, y and z axes of predefined coordinate system, the acceleration signal components Ax, Ay and the Az that are obtained by the first accelerometer are decomposed, produces acceleration signal components Ax ', the Ay ' in the x, y and z axes of this predefined coordinate system and Az '；In the x, y and z axes of this predefined coordinate system, acceleration signal components Ax, Ay and the Az that will be obtained by the second accelerometer decompose, to produce acceleration signal components Ax in the x, y and z axes of this predefined coordinate system ", Ay " and Az "；In the x, y and z axes of this predefined coordinate system, respectively from acceleration signal components Ax ", Ay " and Az " deduct acceleration signal components Ax ', Ay ' and Az ', to produce remaining acceleration signal components Ax " ', Ay " ' and Az " '；And by remaining acceleration signal components Ax " ', Ay " ' and Az " ' synthesize, to produce acceleration signal Vacc.
According to embodiments of the invention, the first accelerometer and the second accelerometer are positioned such that, and three axles of the first accelerometer are parallel with the three of the second accelerometer axles respectively.
In a preferred embodiment, in three axles of each accelerometer the first accelerometer and the second accelerometer being positioned such that in these two accelerometers one is alignment, and remaining two axles of each accelerometer in these two accelerometers are parallel to each other.
Alternately, three axles of the first accelerometer can extend at the different directions of three axles relative to the second accelerometer respectively.In other words, according to the present invention, it is not necessary to the first accelerometer and the second accelerometer are placed on the completely relative point of health opposite side, and nor is it necessary that and be positioned to be parallel to each other by two accelerometers, and therefore, the present invention can be widely used in clinical setting.
Even so, according to further embodiment, this device could be included for two accelerometers are fixed on the fixed cell on the health at optimum position place.
Such as, because lung includes two parts, when being arranged on when two accelerometers on the front side of health and rear side, preferably align with the centrage of left lung or right lung in this front position and rear position.Certainly, accelerometer can also be centrally placed on health.But, like this signal is likely to just very not notable
According to a further aspect in the invention, the method providing the noise that a kind of removal is caused in respiratory movement is monitored by body kinematics, the method includes: obtained the obtaining step of acceleration signal components Ax, Ay and Az by least two accelerometer, the first accelerometer and the second accelerometer in this at least two accelerometer are placed on the health opposite side of abdominal part or chest region；Produce step, acceleration signal components Ax, Ay and the Az of its acceleration signal components Ax, Ay and Az of obtaining according to the first accelerometer and the acquisition of the second accelerometer, produce do not have noisy acceleration signal Vacc.
According to one embodiment of the invention, this generation step includes: the acceleration signal components Ax, Ay and the Az that obtain from the first accelerometer synthesize the first acceleration signal V1acc；The acceleration signal components Ax, Ay and the Az that obtain from the second accelerometer synthesize the second acceleration signal V2acc；By deducting the first acceleration signal V1acc from the second acceleration signal V2acc, produce acceleration signal Vacc.
According to other embodiments of the present invention, this generation step includes: in the x, y and z axes of predefined coordinate system, acceleration signal components Ax, Ay and the Az that to be obtained by the first accelerometer decompose, to produce acceleration signal components Ax ', Ay ' in the x, y and z axes of this predefined coordinate system and Az '；In the x, y and z axes of this predefined coordinate system, acceleration signal components Ax, Ay and the Az that will be obtained by the second accelerometer decompose, to produce the acceleration signal components Ax in the x, y and z axes of this predefined coordinate system ", Ay " and Az "；In the x, y and z axes of this predefined coordinate system, from acceleration signal components Ax ", Ay " and Az " be individually subtracted acceleration signal components Ax ', Ay ' and Az ', to produce remaining acceleration signal components Ax " ', Ay " ' and Az " '；By remaining acceleration signal components Ax " ', Ay " ' and Az " ' synthesize, to produce acceleration signal Vacc.
With reference to the description made in conjunction with accompanying drawing, the other objects and advantages of the present invention becomes more apparent upon and will be better understood.
Accompanying drawing explanation
Hereinafter in conjunction with embodiment and be described in greater detail with reference to the accompanying drawings and explain the present invention, in the accompanying drawings:
Fig. 1 shows the placement of two accelerometers 11 and 12 according to one embodiment of the invention；
Fig. 2 shows the ultimate principle of the device 30 for removing the noise caused in respiratory movement is monitored by body kinematics according to the present invention；
Fig. 3 is the block diagram of the device 30 according to one embodiment of the invention.
Fig. 4 is the flow chart of the method 40 removing the noise caused in respiratory movement is monitored by body kinematics according to the present invention；
The Fig. 5 flow chart according to the step 42 in the method 40 of one embodiment of the invention；
Fig. 6 shows that three axles of the first accelerometer 11 lay respectively at the situation of the different directions of three axles relative to the second accelerometer；And
Fig. 7 is the flow chart of the step 42 of method 40 according to other embodiments of the present invention.
Accompanying drawing labelling identical in accompanying drawing represents similar or characteristic of correspondence and/or function.
Detailed description of the invention
Embodiments of the invention will be described in greater detail with reference to the attached drawings hereinafter.
The output signal of conventional single accelerometer solution is made up of two parts, i.e. part instruction respiratory movement and another part instruction body kinematics.It is difficult for distinguishing the two part in output signal, and this single accelerometer solution being conventional can not effectively remove the reason of the noise caused by body kinematics, even if being also such by wave filter.
Fig. 1 illustrates according to embodiments of the invention, and two accelerometers 12 are placed on human body.Fig. 2 illustrates the ultimate principle of the device 30 for removing the noise caused in respiratory movement is monitored by body kinematics according to the present invention.
As can be seen from Figure 1, in the present invention, except the first accelerometer 11, also introduce the second accelerometer 12, and the second accelerometer 12 is placed on the health identical with the first accelerometer 11.
Operation principle according to accelerometer, the acceleration of accelerometer 11 and accelerometer 12 will be respectively as follows:
V1acc=V1m+V1r and V2acc=V2m+V2r,
Wherein, V1m and V2m represents the acceleration produced by body kinematics, and V1r and V2r represents by breathing the acceleration produced.No matter how two accelerometers are placed in position or direction, body kinematics the vector acceleration caused will be duplicate.
Fig. 2 shows an example, and wherein accelerometer 11 and accelerometer 12 are placed on the opposite side of chest, and the x, y and z axes of each accelerometer are parallel to each other.By as can be seen from Figure 2, in this case, body kinematics the vector acceleration caused will be duplicate.But, respiratory movement the vector acceleration caused will be contrary on direction.
From Fig. 2, those skilled in the art it is readily understood that, by exporting, from two, the part eliminating instruction body kinematics in signals, be readily removable the noise caused by body kinematics.
Fig. 3 is the block diagram of devices in accordance with embodiments of the present invention.
As can as seen from Figure 3, device 30 includes the accelerometer 11 shown in Fig. 1 and accelerometer 12, accelerometer 11 and accelerometer 12 and is placed on the health opposite side of abdominal part or chest region.
According to embodiments of the invention, it is possible to the first accelerometer and the second accelerometer to be positioned such that three axles of the first accelerometer are parallel respectively with the three of the second accelerometer axles.
In a preferred embodiment, it is possible to be positioned such that in three axles of each accelerometer in two accelerometers to the first accelerometer and the second accelerometer one is alignment, and in two accelerometers, two axles of the residue of each accelerometer extend parallel to each other.
Alternately, three axles of the first accelerometer 11 extend at the different directions of three axles relative to the second accelerometer 12 respectively.In other words, according to the present invention, it is not necessary to the first accelerometer and the second accelerometer are placed on the complete corresponding point of health opposite side, and it is not necessary to be positioned to be parallel to each other by two accelerometers, and therefore, the present invention can be widely used in clinical setting.
This device 30 also includes processing unit 31, this processing unit 31 is used for, according to the acceleration signal components Ax, Ay and the Az that are obtained by the first accelerometer 11 and the acceleration signal components Ax, Ay and the Az that are obtained by the second accelerometer 12, producing do not have noisy acceleration signal Vacc.
Although those skilled in the art it will be easily understood that in Fig. 1 and Fig. 3 display only two accelerometers 11 and 12, but this device can comprise more than the accelerometer of two.
For example, it is possible to have the accelerometer laid respectively on health opposite side more than a pair.
Fig. 4 is the flow chart of the method 40 for removing the noise produced in respiratory movement is monitored by body kinematics according to the present invention, describes the operation principle of assembly of the invention 30 below in association with Fig. 4.
As shown in Figure 4, the method 40 removing the noise produced by body kinematics in respiratory movement is monitored according to the present invention includes obtaining step 41, and at least two accelerometer (first accelerometer 11 and the second accelerometer 12) of this obtaining step 41 health opposite side by being placed on abdominal part or chest region obtains acceleration signal components Ax, Ay and Az.
The method 40 also includes producing step 42, and this generation step 42 produces do not have noisy acceleration signal Vacc according to the acceleration signal components Ax, Ay and the Az that are obtained by the first accelerometer 11 and the acceleration signal components Ax, Ay and the Az that are obtained by the second accelerometer 12.
Owing to adopting the first accelerometer 11 and the second accelerometer 12 according to device 30 of the present invention and method 40, different from the conventional solution monitoring respiratory movement effort only with an accelerometer, it is possible to eliminate or remove the noise produced by health.
It addition, because the first accelerometer 11 and the second accelerometer 12 are placed on the health opposite side of abdominal part or chest region, it is possible to enhancing signal indicates respirometric part, and thus respiratory movement monitoring can be more effective and sensitive.
As to how according to first accelerometer obtain acceleration signal components Ax, Ay and Az and by second accelerometer obtain acceleration signal components Ax, Ay and Az produce do not have noisy acceleration signal Vacc, it is possible to adopt at least following two algorithm.
As it has been described above, according to the present invention, it is not necessary to the first accelerometer and the second accelerometer are placed on the complete corresponding point of health opposite side, and are not necessary to be positioned to be parallel to each other by two accelerometers.
In other words, the two accelerometer can be placed as shown in Figure 2, and can also place as shown in Figure 6.As shown in Figure 6, three axles of the first accelerometer 11 extend respectively on the different directions of three axles relative to the second accelerometer 12.
Fig. 5 is the flow chart of the step 42 in method 40 according to an embodiment of the invention.
As it is shown in figure 5, the generation step 42 producing not have noisy acceleration signal Vacc includes:
Synthesis step 51, it synthesizes the first acceleration signal V1acc from acceleration signal components Ax, Ay and Az that the first accelerometer 11 obtains；
Synthesis step 52, it synthesizes the second acceleration signal V2acc from acceleration signal components Ax, Ay and Az that the second accelerometer 12 obtains；And
Producing step 53, it produces acceleration signal Vacc by deducting the first acceleration signal V1acc from the second acceleration signal V2acc.
About above-mentioned algorithm, being no matter that three axles of the first accelerometer are respectively parallel to three axles with the second accelerometer, or the three of the first accelerometer axles extend at the different directions of three axles relative to the second accelerometer, the method for the present invention is all feasible.
Fig. 7 is the flow chart of the step 42 in method 40 according to other embodiments of the present invention.
As described in Figure 7, the generation step 42 producing not have noisy acceleration signal Vacc includes:
Decomposition step 71, they are in the x, y and z axes of predefined coordinate system, are undertaken the acceleration signal components Ax, Ay and the Az that are obtained by the first accelerometer decomposing acceleration signal components Ax ', the Ay ' to produce in the x, y and z axes of this predefined coordinate system and Az '；
Decomposition step 72, they are in the x, y and z axes of this predefined coordinate system, and acceleration signal components Ax, Ay and the Az that will be obtained by the second accelerometer carries out decomposing producing the acceleration signal components Ax in the x, y and z axes of this predefined coordinate system ", Ay " and Az "；
Subtraction step 73, they are in the x, y and z axes of this predefined coordinate system, from acceleration signal components Ax ", Ay " and Az " be individually subtracted acceleration signal components Ax ', Ay ' and Az ', to produce remaining acceleration signal components Ax " ', Ay " ' and Az " '；And
Producing step 74, it is by by remaining acceleration signal components Ax " ', Ay " ' and Az " ' carry out synthesis and produce acceleration signal Vacc.
About this algorithm, being no matter three axles of the first accelerometer three axles being respectively parallel to the second accelerometer, or the three of the first accelerometer axles extend on the different directions relative to three axles of the second accelerometer, the method for the present invention is all feasible.
From the only difference is that of the previous algorithm described in conjunction with Fig. 5: because x, y and z direction of two accelerometers is different, predefined coordinate system is set to reference frame, thus the acceleration signal components Ax, Ay and the Az that are obtained by first accelerometer and the second accelerometer can project thereon.
As by those skilled in the art it will be appreciated that, this predefined coordinate system can be randomly disposed as shown in Figure 6.In other words, it can be two accelerometers coordinate system in one, it is also possible to be the coordinate system all different from the coordinate system of two accelerometers.In a preferred embodiment, it can be G (gravity) coordinate system.
According to the present invention, this device could be included for two accelerometers are fixed on the fixed cell on the health at optimum position place.Due to MEMS technology, the shape factor of accelerometer can be very thin and only small, therefore, when it be embedded into band or clothes in time, it will not result in inconvenience, even at sleep during without.For mount accelerometers, it is possible to use textile tapes or it should be ensured that accelerometer is at other device of proper position.
Such as, because lung includes two parts, so when two accelerometers are arranged on front side and the rear side of health, preferably align with the centrage of left lung or right lung in front position and rear position.Certainly, accelerometer can also be centrally placed on health.But, like this signal is likely to very not notable.
It should be noted that, the above embodiments are illustrative rather than the restriction present invention, and those skilled in the art can design alternative embodiment without departing from scope of the following claims.In the claims, any accompanying drawing labelling being placed between round parentheses is not construed as limitations on claims.Word " includes " existence being not precluded from element or the step do not listed in claim or description.Word " one " or " one " before element do not exclude the presence of multiple such element.In the system claims enumerating several unit, several in these unit can be implemented by the software of one and same part and/or hardware.The use of word " first ", " second " and " the 3rd " etc., does not indicate that any order.These words should be read as title.
Claims (14)
1. the device (30) being used for removing the noise caused in respiratory movement is monitored by body kinematics, including:
At least two accelerometer, wherein, the first accelerometer (11) and the second accelerometer (12) in described at least two accelerometer are placed on the health opposite side of abdomen area or chest region, for exporting identical signal with same direction when whole body moves, and it is used for exporting the respirometric opposite signal of reflection；And
Processing unit (31), it produces the acceleration signal Vacc without described noise for acceleration signal components Ax, Ay and the Az according to the acceleration signal components Ax, Ay and the Az that are obtained by described first accelerometer and by described second accelerometer acquisition.
2. device according to claim 1 (30), wherein, described processing unit (31) produces the described acceleration signal Vacc without described noise in the following manner:
The first acceleration signal V1acc is synthesized from the described acceleration signal components Ax, Ay and the Az that are obtained by described first accelerometer (11)；
The second acceleration signal V2acc is synthesized from the described acceleration signal components Ax, Ay and the Az that are obtained by described second accelerometer (12)；And
By deducting described first acceleration signal V1acc from described second acceleration signal V2acc, produce described acceleration signal Vacc.
3. device according to claim 1 (30), wherein, described processing unit produces the described acceleration signal Vacc without described noise in the following manner:
In the x, y and z axes of predefined coordinate system, the described acceleration signal components Ax, Ay and the Az that are obtained by described first accelerometer (11) are decomposed, to produce acceleration signal components Ax ', Ay ' in the x, y and z axes of described predefined coordinate system and Az '；
X in described predefined coordinate system, in y and z-axis, the described acceleration signal components Ax, Ay and the Az that are obtained by described second accelerometer (12) are decomposed, to produce acceleration signal components Ax in the x, y and z axes of described predefined coordinate system ", Ay " and Az "；
In the x, y and z axes of described predefined coordinate system, respectively from described acceleration signal components Ax ", Ay " and Az " deduct described acceleration signal components Ax ', Ay ' and Az ', to produce remaining acceleration signal components Ax " ', Ay " ' and Az " '；And
By by described remaining acceleration signal components Ax " ', Ay " ' and Az " ' synthesize, produce described acceleration signal Vacc.
4. the device (30) according to any one in claim 1-3, wherein
Described first accelerometer (11) and described second accelerometer (12) are positioned so that three axles of described first accelerometer (11) are parallel with three axles of described second accelerometer (12) respectively.
5. device according to claim 4 (30), wherein
Described first accelerometer (11) and described second accelerometer (12) are positioned, making one of three axles of each accelerometer in said two accelerometer is alignment, and two axles of the residue of each accelerometer in said two accelerometer are parallel to each other.
6. the device (30) according to any one in claim 1-3, wherein
Three axles of described first accelerometer (11) are respectively relative to three axles of described second accelerometer (12) and are in different directions.
7. device according to claim 1 (30), also include:
Fixed cell, it is for being fixed on described health by described first accelerometer (11) and described second accelerometer (12).
8. device according to claim 1, wherein
The described health opposite side that described first accelerometer (11) and described second accelerometer (12) are positioned is two sides of the front and back of described health or described health.
9. the method (40) removing the noise caused in respiratory movement is monitored by body kinematics, including:
Obtaining step (41), it obtains acceleration signal components Ax, Ay and Az by least two accelerometer, the first accelerometer (11) and the second accelerometer (12) in described at least two accelerometer are placed on the health opposite side of abdomen area or chest region, for exporting identical signal with same direction when whole body moves, and it is used for exporting the respirometric opposite signal of reflection；And
Produce step (42), it, according to the described acceleration signal components Ax, Ay and the Az that are obtained by described first accelerometer (11) and the described acceleration signal components Ax, Ay and the Az that are obtained by described second accelerometer (12), produces the acceleration signal Vacc without described noise.
10. method according to claim 9 (40), wherein, described generation step (42) including:
(51) first acceleration signal V1acc are synthesized from the described acceleration signal components Ax, Ay and the Az that are obtained by described first accelerometer (11)；
Described acceleration signal components Ax, Ay and the Az that will be obtained by described second accelerometer (12) synthesizes (52) second acceleration signal V2acc；And
(53) described acceleration signal Vacc is produced by deducting described first acceleration signal V1acc from described second acceleration signal V2acc.
11. method according to claim 9 (40), wherein, described generation step (42) including:
In the x, y and z axes of predefined coordinate system, undertaken decomposing (71) by described acceleration signal components Ax, Ay and Az that described first accelerometer obtains, to produce acceleration signal components Ax ', Ay ' in the x, y and z axes of described predefined coordinate system and Az '；
In the x, y and z axes of described predefined coordinate system, undertaken decomposing (72) by described acceleration signal components Ax, Ay and Az that described second accelerometer obtains, to produce acceleration signal components Ax in the x, y and z axes of described predefined coordinate system ", Ay " and Az "；
In the x, y and z axes of described predefined coordinate system, respectively from described acceleration signal components Ax ", Ay " and Az " deduct (73) described acceleration signal components Ax ', Ay ' and Az ', to produce remaining acceleration signal components Ax " ', Ay " ' and Az " '；And
By by described remaining acceleration signal components Ax " ', Ay " ' and Az " ' carry out synthesizing and produce (74) described acceleration signal Vacc.
12. the method (40) according to any one in claim 9-11, wherein
Described first accelerometer (11) and described second accelerometer (12) are placed so that three axles of described first accelerometer (11) are parallel with three axles of described second accelerometer (12) respectively.
13. method according to claim 12 (40), wherein,
Described first accelerometer and described second accelerometer are placed so that one of three axles of each accelerometer in said two accelerometer are alignment, and two axles of the residue of each accelerometer in said two accelerometer are parallel to each other.
14. method according to claim 9 (40), wherein
By fixed cell, described first accelerometer (11) and described second accelerometer (12) are fixed on described health.
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| CN106725300B (en) * | 2015-11-23 | 2019-12-13 | 财团法人车辆研究测试中心 | physiological signal processing system and noise filtering method thereof |
| CN108784703B (en) * | 2018-07-05 | 2021-02-02 | 西南石油大学 | Wearable respiration monitoring method for middle-aged and elderly people |
| WO2021051324A1 (en) * | 2019-09-18 | 2021-03-25 | 深圳迈瑞生物医疗电子股份有限公司 | Respiration identification method and apparatus, ventilation device, and storage medium |
| CN113768491B (en) * | 2021-09-08 | 2022-12-09 | 西安交通大学 | Respiration depth and respiration frequency measuring device and method based on inertia measuring unit |
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