CN113712537A - Human body microseismic signal simulation method and device - Google Patents
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Abstract
The invention discloses a human body microseismic signal simulation method and a device in the technical field of physiological signal detection, and the method comprises the following steps: collecting a plurality of real microseismic signals of human body lying and in a calm state, and storing the microseismic signals as base signals in a flash memory of a main processor; parameters such as the simulated heartbeat frequency, the simulated respiratory frequency, the signal amplitude, the waveform and the like of the output signal are set through input equipment; carrying out frequency processing and amplitude processing on the base signal according to the input signal parameters, and combining the processed simulated heartbeat signal and the simulated respiration signal according to a certain rule; outputting the processed simulated human body microseismic signals to a low-frequency power amplifier through a digital-to-analog converter; the low-frequency power amplifier is connected to the vibrator, the vibrator is fixed on the bed body in a certain coupling mode, and the vibrator drives the test bed to vibrate.
Description
Technical Field
The invention relates to the technical field of physiological signal detection, in particular to a human body microseismic signal simulation method and device.
Background
With the improvement of the physical living standard and the change of the living style of people in the current society, the life of people is remarkably prolonged. Meanwhile, the incidence rate of chronic diseases such as cardiovascular diseases, diabetes, chronic obstructive pulmonary diseases and the like is on a higher and higher trend, and the long-term continuous monitoring of the vital signs of the human body has important significance for preventing and controlling the chronic diseases. However, currently, the commonly used physical monitoring methods such as Electrocardiogram (ECG) and blood oxygen volume pulse wave (PPG) need to directly contact the skin of the user with an electrode patch or a sensor, which brings discomfort to the user and is not suitable for long-term monitoring.
Recently, Ballistocardiogram (BCG) has gained attention as a non-contact physiological signal monitoring means. The long-term physical sign monitoring by using the ballistocardiogram has the advantages of no wound, no interference, convenient detection and the like. The applicant filed an invention patent of "an accurate heart beat-by-beat heart rate calculating device and method" on 18/3/2020 (application number CN 202010191922.0).
In order to test the accuracy of the parameter calculation of related products under different heart rates, human body microseismic signals need to be simulated, but the existing human body microseismic signal simulation device basically adopts a stepping motor to generate mechanical motion signals, for example, the invention patent 'human body motion simulation system' with the publication number of CN106128263B discloses a system for simulating human body motion by using the stepping motor. The utility model discloses a "human microseismic signal generator of simulation" of utility model patent with grant publication number CN207462074U discloses a human microseismic signal generator of simulation that uses step motor periodicity to beat some to equipment under test. The method has the problems that the method can only periodically dot the surface of a product to be detected to generate a single pulse signal, the heart impact signal of a human body is a relatively complex signal, the signal has high requirements on a related algorithm for calculating the heart rate and the respiration rate in equipment to be detected, a stepping motor cannot completely simulate a real heart impact signal, and the reliability and the effectiveness of the system and the algorithm cannot be really verified.
Based on the above, the invention designs a human body microseismic signal simulation method and device to solve the above problems.
Disclosure of Invention
In order to overcome the defects of the current method, the invention provides a human body microseismic signal simulation method based on cardiac shock signal reproduction and a human body microseismic signal simulation device. The acquired BCG signals with different shape characteristics and different heart rates and breathing rates are processed to obtain the required simulated heart rate, breathing rate and vibration amplitude, so that the microseismic signal of the human body can be restored more truly, the physical sign signals such as the heart rate and the breathing rate which are difficult to reach by normal and healthy people can be generated, and the accuracy of the equipment to be detected in the abnormal physical sign condition can be tested.
In order to achieve the purpose, the invention provides the following technical scheme: a human body microseismic signal simulation method comprises the following steps:
s101: collecting a plurality of real microseismic signals of human body lying and in a calm state, and storing the microseismic signals as base signals in a flash memory of a main processor;
s102: parameters such as the simulated heartbeat frequency, the simulated respiratory frequency, the signal amplitude, the waveform and the like of the output signal are set through input equipment;
s103: carrying out frequency processing and amplitude processing on the base signal according to the input signal parameters, and combining the processed simulated heartbeat signal and the simulated respiration signal according to a certain rule;
s104: outputting the processed simulated human body microseismic signals to a low-frequency power amplifier through a digital-to-analog converter;
s105: the low-frequency power amplifier is connected to the vibrator, the vibrator is fixed on the bed body in a certain coupling mode, and the vibrator drives the test bed to vibrate.
Preferably, in S101, the microseismic signals are respiratory signals and cardiac shock signals, and each base signal is greater than 30 seconds.
Preferably, in S103, the frequency processing is a signal resampling method using a nearest neighbor method or linear interpolation.
A human body microseismic signal simulation device comprises a main processor, a processing unit and a processing unit, wherein the main processor is used for storing, processing and outputting human body microseismic signals and receiving input parameters of input equipment; the input equipment is used for setting parameters such as simulated heart rate, respiration rate, amplitude, waveform and the like of the microseismic signal to be output; the low-frequency power amplifier is used for amplifying the power of the received analog microseismic signal and endowing the analog microseismic signal with enough energy; the power supply equipment is used for supplying power to the main processor, the input equipment and the low-frequency power amplifier; and the vibrator is used for receiving the excitation of the low-frequency power amplifier to generate vibration.
Preferably, the power of the low-frequency power amplifier is larger than 50W, the lowest frequency response range is smaller than 30Hz, and the vibrator is a somatosensory vibrator or a low-frequency loudspeaker.
Preferably, the main processor comprises a storage unit for storing the heartbeat-based signal and the respiration-based signal; the signal processing unit is used for processing the base signal according to the set parameters; and the digital-to-analog converter is used for converting the digital signal into an analog signal which can be used by the power amplifier.
Preferably, the device also comprises a test bed for presenting simulated human body microseismic signals and detecting the performance of the equipment to be detected; a coupling for transmitting vibrations generated by the vibrator to the test bed.
Preferably, the top of the test bed is connected with a coupling wooden frame, the top of the coupling wooden frame is connected with a vibrator for installation, a pillow is placed at the top of the test bed, and equipment to be tested is placed under the pillow.
Preferably, the vibrator is electrically connected with a low-frequency power amplifier and a main processor, and the main processor is electrically connected with a touch screen.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts real human body microseismic signals as 'base signals' to generate simulated body vibration signals and can set parameters such as required simulated heart rate, breathing rate and the like. The method overcomes the defects that other body vibration simulation methods can only generate a single dotting signal and cannot well simulate a human body microseismic signal, and can better test the performance of the non-inductive sign detection equipment to be detected.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic diagram of the simulation apparatus according to the present invention;
FIG. 3 is a schematic diagram of the overall application method of the simulation apparatus of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
201-input device, 202-main processor, 2021-signal storage unit, 2022-signal processing unit, 2023-DAC, 203-power supply, 204-low frequency amplifier, 205-vibrator, 206-coupling, 207-test bed, 302-coupling wooden frame, 304-pillow, 305-device under test.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution: a human body microseismic signal simulation method and device comprises the following steps:
s101: collecting a plurality of real microseismic signals of human body lying and in a calm state, and storing the microseismic signals as base signals in a flash memory of a main processor;
s102: parameters such as the simulated heartbeat frequency, the simulated respiratory frequency, the signal amplitude, the waveform and the like of the output signal are set through input equipment;
s103: carrying out frequency processing and amplitude processing on the base signal according to the input signal parameters, and combining the processed simulated heartbeat signal and the simulated respiration signal according to a certain rule;
s104: outputting the processed simulated human body microseismic signals to a low-frequency power amplifier through a digital-to-analog converter;
s105: the low-frequency power amplifier is connected to the vibrator, the vibrator is fixed on the bed body in a certain coupling mode, and the vibrator drives the test bed to vibrate.
The device to be detected or other signal acquisition devices are used for acquiring a plurality of real human body microseismic signals as 'base signals' to be stored in the main processor, and the device to be detected or other signal acquisition devices are used for acquiring a plurality of real human body microseismic signals in prone position and calm state, namely breathing signals and heart shock signals (BCG), as 'base signals' to be stored in a flash memory of the central processor. Each "base signal" takes more than 30 seconds.
The parameters of the output signal such as the simulated heartbeat frequency, the simulated respiratory frequency, the signal amplitude, the waveform and the like are set through the input equipment, corresponding human body microseismic signals are generated according to the set parameters of the simulated heartbeat frequency, the simulated respiratory frequency, the signal amplitude, the waveform and the like, and the parameters are set through the input equipment.
Carrying out frequency processing and amplitude processing on the 'base signal' according to input signal parameters, combining the processed analog heartbeat signal and the processed analog respiration signal according to a certain rule, wherein the frequency processing is a signal resampling method adopting a nearest neighbor method or linear interpolation, and the resampling frequency is according to the following formula:
Fr_heart＝Fb_heart×HRb/HRset
Fr_resp＝Fb_resp×RRb/RRset
wherein Fr_heartFor resampling frequencies for heartbeat-based signals, Fb_heartIs the base signal sampling rate, HRbThe heart rate, HR, corresponding to the base signalsetIs the set output heart rate.
Fr_respFor the resampling frequency of the respiratory-based signal, Fb_respTo the base signal sampling rate, RRbThe respiratory rate, RR, corresponding to the respiratory-based signalsetIs the set output respiratory rate.
Further, the resampling by the linear interpolation method is performed by adopting the following method: taking the resampling of the heartbeat-based signal as an example, Fr_heart/Fb_heartThen the base signal is subjected to P times of up-sampling and Q times of down-sampling to obtain a re-sampling signal, and the re-sampling of the respiration base signal is performed in the same way.
Further, the amplitude processing of the "base signal" is performed according to the following formula:
S′r_heart＝Sr_heartx K, wherein S'r_heartFor amplitude-processed analog heartbeat signals, Sr_heartFor the analog heartbeat signal after resampling, K is the set amplitude parameter and is the ratio of the amplitude of the output signal to the amplitude of the "base signal". The amplitude processing of the analog respiration signal is the same.
Further, the simulated heart rate adds the heart beat signal and the respiration signal after resampling, and the length of the finally obtained signal is the length with the shorter length in the two signals.
Sr_sum(n)＝S′r_heart(n)+S′r_resp(n)(n≤min(Nb_heart，Nb_resp))
Wherein Sr_sum(n) is a synthesized simulated human body microseismic signal mixed with heartbeat and respiration signals; s'r_heart(n) is the analog heartbeat signal after frequency processing and amplitude processing; s'r_respAnd (n) is the analog respiration signal after frequency processing and amplitude processing.
The processed Analog human body microseismic Signal is output to the low-frequency power amplifier through a Digital-to-Analog converter (DAC), and the processed Analog human body microseismic Signal is stored in the main processor, is a Digital Signal (Digital Signals) and needs to be converted into an Analog Signal (Analog Signal), and the step is completed by the Digital-to-Analog converter, and is processed by using a DAC module in the main processor in the embodiment. The low frequency power amplifier needs to have a good frequency response in the frequency range of the microseismic signal to amplify the power or energy of the microseismic signal enough to cause the vibrator to generate vibration of sufficient energy.
The power amplifier is connected to the vibrator and fixes the vibrator on the bed body in a certain coupling mode, the vibrator drives the bed to vibrate, after the power amplifier amplifies signals to enough power, the signals are input to the vibrator through the power amplifier, and the vibrator receives the excitation of the signals to generate corresponding vibration. And the vibrator needs to generate vibration with the test bed in a stable enough coupling mode to simulate a human body microseismic signal.
Referring to fig. 2, a schematic structural diagram of a human body microseismic signal simulation device of the present invention is shown, which comprises:
the input device 201 is used for setting parameters such as simulated heart rate, respiration rate, amplitude, waveform and the like of the microseismic signal to be output. And the main processor 202 is used for storing, processing and outputting the human body microseismic signals and receiving input parameters of the input equipment. The memory unit 2021 is included for storing the heartbeat "base signal" and the respiration "base signal"; a signal processing unit 2022, configured to process the "base signal" according to the set parameter; a DAC (digital-to-analog converter) 2023, i.e. a digital-to-analog converter, is used to convert the digital signal into an analog signal that can be used by the power amplifier. A power supply device 203 for supplying power to the main processor, the input device and the low frequency power amplifier. And the low-frequency power amplifier 204 is used for performing power amplification on the received analog microseismic signal to endow the received analog microseismic signal with enough energy. And the vibrator 205 is used for receiving the excitation of the power amplifier to generate vibration. A coupling 206 for transmitting vibrations generated by the vibrator to the test bed. And the test bed (including the equipment to be tested) 207 is used for presenting simulated human body microseismic signals and detecting the performance of the equipment to be tested.
The input device 201 may be, but is not limited to, a touch screen, a button, and a PC upper computer. The main processor 202 is an integrated circuit chip having signal processing capabilities and may be, but is not limited to, a Central Processing Unit (CPU), a Digital Signal Processor (DSP), a Micro Control Unit (MCU), a Field Programmable Gate Array (FPGA). The signal storage unit 2021 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a FLASH Memory (FLASH EPROM), and the like. The DAC (digital-to-analog converter) 2023 may be an analog-to-digital conversion module integrated in the host processor or may be a separate digital-to-analog conversion chip. The power of the low frequency power amplifier 204 should be greater than 50W and the lowest frequency response range should be less than 30 Hz. The vibrator 205 may be, but is not limited to, a somatosensory vibrator, a subwoofer, or the like.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating an overall application method of a human body microseismic signal simulation device, which is a specific embodiment of the present invention, and comprises:
the test bed 207, the coupling wooden frame 302, the vibrator 205, the pillow 304, the device to be tested 305, the low-frequency power amplifier 204, the main processor 202 and the TFT touch screen 201. Specifically, the test bed 207 is connected by a coupling wooden frame 302, and the apparatus to be tested 305 is placed under a pillow 304. The TFT touch screen 201 may receive various types of parameters input by a user and may present a current output waveform. After the signal outputted from the main processor 202 is amplified by the low frequency power amplifier 204, the vibrator 205 is excited to generate vibration with sufficient energy, and the vibration drives the test bed 207 to generate vibration, which has the same effect as that of a real human body lying on the test bed.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. A human body microseismic signal simulation method is characterized in that: the method comprises the following steps:
s101: collecting a plurality of real microseismic signals of human body lying and in a calm state, and storing the microseismic signals as base signals in a flash memory of a main processor;
s102: parameters such as the simulated heartbeat frequency, the simulated respiratory frequency, the signal amplitude, the waveform and the like of the output signal are set through input equipment;
s103: carrying out frequency processing and amplitude processing on the base signal according to the input signal parameters, and combining the processed simulated heartbeat signal and the simulated respiration signal according to a certain rule;
s104: outputting the processed simulated human body microseismic signals to a low-frequency power amplifier through a digital-to-analog converter;
s105: the low-frequency power amplifier is connected to the vibrator, the vibrator is fixed on the bed body in a certain coupling mode, and the vibrator drives the test bed to vibrate.
2. The method for simulating a human microseismic signal of claim 1 wherein: in S101, the microseismic signals are respiratory signals and cardiac shock signals, and each base signal is greater than 30 seconds.
3. The method for simulating a human microseismic signal of claim 1 wherein: in S103, the frequency processing is a signal resampling method using a nearest neighbor method or linear interpolation.
4. A human microseismic signal simulation device suitable for the method of any one of claims 1-3, wherein: the device comprises a main processor, a processing unit and a processing unit, wherein the main processor is used for storing, processing and outputting the human body microseismic signals and receiving input parameters of input equipment; the input equipment is used for setting parameters such as simulated heart rate, respiration rate, amplitude, waveform and the like of the microseismic signal to be output; the low-frequency power amplifier is used for amplifying the power of the received analog microseismic signal and endowing the analog microseismic signal with enough energy; the power supply equipment is used for supplying power to the main processor, the input equipment and the low-frequency power amplifier; and the vibrator is used for receiving the excitation of the low-frequency power amplifier to generate vibration.
5. The human body microseismic signal simulation device of claim 4 wherein: the power of the low-frequency power amplifier is larger than 50W, the lowest frequency response range is smaller than 30Hz, and the vibrator is a somatosensory vibrator or a low-frequency loudspeaker.
6. The human body microseismic signal simulation device of claim 4 wherein: the main processor comprises a storage unit, a processing unit and a control unit, wherein the storage unit is used for storing the heartbeat-based signal and the respiration-based signal; the signal processing unit is used for processing the base signal according to the set parameters; and the digital-to-analog converter is used for converting the digital signal into an analog signal which can be used by the power amplifier.
7. The human body microseismic signal simulation device of claim 4 wherein: the device also comprises a test bed used for presenting simulated human body microseismic signals and detecting the performance of the equipment to be detected; a coupling for transmitting vibrations generated by the vibrator to the test bed.
8. The human body microseismic signal simulation device of claim 7 wherein: the test bed top is connected with the coupling wooden frame, the coupling wooden frame top is connected the installation with the vibrator, the pillow has been placed at the test bed top, it waits to examine equipment to have placed under the pillow.
9. The human body microseismic signal simulation device of claim 8 wherein: the vibrator is electrically connected with a low-frequency power amplifier and a main processor, and the main processor is electrically connected with a touch screen.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115457828A (en) * | 2022-11-10 | 2022-12-09 | 中物云信息科技(无锡)有限公司 | Human body respiration heartbeat simulation system |
| CN116229789A (en) * | 2023-03-09 | 2023-06-06 | 北京大众益康科技有限公司 | Simulator and method for performing heartbeat simulation by using same |
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| CN110048721A (en) * | 2019-03-12 | 2019-07-23 | 深圳和而泰家居在线网络科技有限公司 | Signal simulator, signal imitation method, apparatus, computer equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115457828A (en) * | 2022-11-10 | 2022-12-09 | 中物云信息科技(无锡)有限公司 | Human body respiration heartbeat simulation system |
| CN115457828B (en) * | 2022-11-10 | 2023-01-03 | 中物云信息科技(无锡)有限公司 | Human body respiration heartbeat simulation system |
| CN116229789A (en) * | 2023-03-09 | 2023-06-06 | 北京大众益康科技有限公司 | Simulator and method for performing heartbeat simulation by using same |
| CN116229789B (en) * | 2023-03-09 | 2024-04-09 | 北京大众益康科技有限公司 | Simulator and method for performing heartbeat simulation by using same |
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