A device based on pet health monitoring

Abstract

The present invention discloses a device and method based on pet health monitoring, which relates to the field of heart rate detection equipment. The device and method include two fixed restraint belts fixed to the pet's body surface, a connecting belt connecting the two fixed restraint belts, and a monitoring component installed on the upper surface of the connecting belt. The monitoring component is used to fit the pet's body surface. The monitoring component includes a positioning module and a signal acquisition module, a signal amplification module, an A / D conversion module, a signal denoising module, a D / A conversion module and a wireless communication module that are sequentially connected. The positioning module is signal-connected to the D / A conversion module, and the wireless communication module is signal-connected to a control terminal. The problem in the prior art that the heart health of the pet cannot be monitored and discovered in a timely manner is solved.

Description

Technical Field

[0001] The present invention relates to the field of heart rate detection equipment, and in particular, to a device and method based on pet health monitoring. Background Art

[0002] As people's living standards continue to improve, more and more people start to keep pets, and the resulting pet health problems continue to emerge. Among them, heart problems have become one of the major problems threatening pet health. However, there are few devices on the market for pet heart rate detection, and the existing detection devices are mostly limited to pet hospitals, requiring professional personnel to operate the detection, the inspection cost is high and the convenience is poor. Pet owners rarely have the habit of regular pet health checks. Most owners who have the habit of taking their pets for health checks only check once a year. Pet illnesses sometimes do not show directly, so it is difficult to detect pets with heart problems in the first place. Summary of the invention

[0003] The present invention provides a device and method based on pet health monitoring to solve the problem in the prior art that the heart health problems of pets cannot be monitored and discovered in a timely manner.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A method based on pet health monitoring, characterized in that it includes the following steps:

[0006] S1: Wearing a monitoring device on the pet's chest, the monitoring device comprising a positioning module and a signal acquisition module;

[0007] S2: Adjust the position of the monitoring device so that the signal acquisition module on the monitoring device is close to the pet's body surface;

[0008] S3: transmitting the collected ECG signal and positioning signal to the control terminal after signal processing, wherein the signal processing includes a signal amplification step, an A / D conversion step, a signal denoising step and a D / A conversion step;

[0009] The signal denoising step comprises:

[0010] S301, performing correlation function denoising on the signal after A / D conversion:

[0011]

[0012] Where: e(t) is the output signal after A / D conversion, R ee (t) is the autocorrelation function of e(t), T is the cardiac cycle, τ is the integral independent variable, is the average autocorrelation function, M is the average window size; t is the independent variable of the autocorrelation function; e(τ) is the input signal at time τ; e(τ-t) is the input signal at time τ-t; e(-t) is the signal after the input signal is deconvoluted;

[0013] S302, the signal denoised by the correlation function is subjected to secondary processing by the following wavelet transform formula:

[0014]

[0015] Where: x(t) is the output signal, a is the scale, b is the time, h (a,b) (t) is the form of the wavelet function after translation and scaling at scale a and time b, Y (a,b) is the processed wavelet coefficient, h (a,b) (t) The result after substituting scale a and time b;

[0016] S303, convert x(t) into an analog / digital signal and output it.

[0017] The present invention monitors the heart of the pet in real time by wearing the monitoring device on the pet's chest, and sends the monitoring data and position data to the control terminal in time for the user to view. If the pet is found to have heart problems, the pet can be found in time through the positioning signal to avoid delayed treatment. In addition, since the electrocardiogram signal of the pet is a non-stationary signal and is easily affected by baseline drift and electromyographic interference, in order to ensure the accuracy of the signal, the collected electrocardiogram signal is processed through a signal amplification step, an A / D conversion step, a signal denoising step and a D / A conversion step to ensure the stability of the signal.

[0018] Since the ECG signal is a periodic signal, and the correlation function can process the periodic signal very well; since the ECG signal has uncertainty of mutation and more details to be extracted, wavelet transform is used to perform secondary processing on the signal.

[0019] Compared with traditional denoising methods, the signal denoising method of the present application is particularly suitable for processing pet electrocardiogram signals.

[0020] It has the following advantages:

[0021] 1. Wavelet transform can adapt to the local characteristics of pet ECG signals, and is particularly effective for non-stationary signals. The autocorrelation function combined with wavelet transform can better identify the periodic components and noise in pet ECG signals, thereby performing more accurate denoising;

[0022] 2. The autocorrelation function can help identify repetitive patterns in pet ECG signals, which may be part of the noise or signal. By combining wavelet transform, these patterns can be distinguished more clearly, thus removing noise more effectively;

[0023] 3. Wavelet transform can better preserve the detailed information of pet ECG signals during denoising;

[0024] 4. The combination of autocorrelation function and wavelet transform can provide good robustness and can effectively denoise even when the noise level is high or the signal quality is poor.

[0025] A device based on pet health monitoring, comprising two fixed restraint belts fixed to the pet's body surface, a connecting belt connecting the two fixed restraint belts and a monitoring component installed on the upper surface of the connecting belt, wherein the monitoring component is in contact with the pet's body surface, and the monitoring component comprises a positioning module and a signal acquisition module, a signal amplification module, an A / D conversion module, a signal denoising module, a D / A conversion module and a wireless communication module which are sequentially connected in signal connection, the positioning module is signal connected to the D / A conversion module, and the wireless communication module is signal connected to a control terminal.

[0026] The device of the present invention uses two fixed restraint belts to allow the monitoring component to be worn on the pet and close to the heart, so as to monitor the pet's heart in real time and send the monitoring data and position data to the control terminal in time for the user to view. To ensure the accuracy of the signal, the signal is collected by the signal acquisition module, and then processed by the signal amplification module, A / D conversion module, signal denoising module, and D / A conversion module to ensure the stability of the signal. The wireless communication module overcomes the distance problem of signal transmission.

[0027] Furthermore, the signal acquisition module includes an MCU and a plurality of electrocardiogram sensors, the electrocardiogram sensors are all signal-connected to the MCU, and the MCU is signal-connected to the signal amplification module.

[0028] ECG signals are collected through multiple ECG sensors with a large collection area, which can avoid misalignment of the signal collection module and keep it away from the pet's heart. The MCU is used to screen and process multiple ECG signals with different intensities to ensure the strength of the ECG signals used for transmission. The MCU is a microcontroller unit with the characteristics of high speed and low power consumption, which can extend the use time of the device.

[0029] Furthermore, the signal amplification module includes a preamplifier circuit, a low-pass filter circuit, a high-pass filter circuit and a post-amplifier circuit.

[0030] Furthermore, the connecting belt includes a first connecting belt and a second connecting belt arranged parallel to each other, the first connecting belt is used to fit the pet's body surface, the electrocardiogram sensor is evenly installed on the first connecting belt, and the signal amplification module, A / D conversion module, signal denoising module, D / A conversion module, positioning module and wireless communication module are all embedded in the second connecting belt.

[0031] The signal amplification module, the A / D conversion module, the signal denoising module, the D / A conversion module, the positioning module and the wireless communication module are installed between the first connection belt and the second connection belt to protect them from damage.

[0032] Furthermore, it also includes an anti-slip buckle and Velcro installed on the outside of the fixed restraint belt and several anti-sliding blocks installed on the inside of the fixed restraint belt. One end of the fixed restraint belt passes through the anti-slip buckle and is fixed by the Velcro. The anti-sliding block is used to contact the pet's body surface.

[0033] The combination of the anti-slip buckle and Velcro can adjust the length of the fixed restraint belt at will. It is easy to wear and can adapt to pets of various sizes. The anti-sliding block is used to prevent the fixed restraint belt from rotating, causing the signal acquisition module to move away from the pet's heart, resulting in signal acquisition failure, weak signal strength and other problems.

[0034] Furthermore, a magnetic buckle slot and a safety lock slot are provided on the side wall of the fixed restraint belt, and both ends of the connecting belt are provided with a magnetic buckle magnetically connected to the magnetic buckle slot and a safety lock buckle matching the safety lock slot.

[0035] Furthermore, the magnetic buckle includes slide rails installed on both sides of the lower end of the magnetic buckle, a slide rod arranged parallel to the slide rails, a tension spring with one end fixed to the slide rails and the other end passing through the slide rod, and a thrust column mounted on the slide rod and connected to the tension spring. The safety lock includes a U-shaped buckle and a slide plate hinged to the U-shaped buckle. The top of the thrust column is fixedly connected to the slide plate, and a slide groove is provided on the side of the slide plate away from the thrust column. The end of the slide plate away from the U-shaped buckle is embedded in the connecting belt and can slide.

[0036] The U-shaped buckle is connected with the safety lock slot to prevent the fixed restraint belt and the connecting belt from falling off. The magnetic force between the magnetic buckle and the magnetic buckle slot provides tension between the fixed restraint belt and the connecting belt. The thrust column provides tension for the U-shaped buckle under the action of the tension spring. The end of the U-shaped buckle and the magnetic buckle tend to move towards each other, making the connection between the fixed restraint belt and the connecting belt more secure. At the same time, the magnetic force and the tension of the tension spring can both play a buffering role, which will not restrict the movement of the pet while the fixed restraint belt and the connecting belt are securely connected. When the sliding push slot is pushed, the length of the tension spring becomes longer, and the U-shaped buckle moves toward the fixed restraint belt, so that the U-shaped buckle is separated from the safety lock slot, which is convenient for adjusting the position of the connecting belt.

[0037] Furthermore, the U-shaped inner side of the U-shaped buckle is provided with a buckle inner slot, the safety lock slide slot is provided with a U-shaped groove matching the U-shaped buckle, and the side wall of the U-shaped groove is provided with a plurality of slide slot inner slots matching the buckle inner slot. The connection belt is laterally limited by the lock buckle inner slot and the slide slot inner slot cooperating with each other.

[0038] One or more technical solutions provided by the present invention have at least the following technical effects or advantages:

[0039] (1) The present invention monitors the heart of a pet in real time by wearing a monitoring component on the pet, and sends the monitoring data and location data to a control terminal in a timely manner for the user to view, and locates the pet through a positioning signal to avoid delayed treatment;

[0040] (2) The signal is collected through the signal acquisition module, and then processed through the signal amplification module, A / D conversion module, signal denoising module, and D / A conversion module to ensure the stability of the signal. The wireless communication module overcomes the distance problem of signal transmission;

[0041] (3) ECG signals are collected by multiple ECG sensors with a large collection area to avoid misalignment of the signal collection module and avoid being away from the pet's heart. The MCU is used to screen and process multiple ECG signals with different strengths to ensure the strength of the ECG signals for transmission. The MCU is a microcontroller unit with high speed and low power consumption, which can extend the use time of the device.

[0042] (4) The length of the fixed restraint belt can be adjusted at will through the combination of anti-slip buckle and Velcro. It is easy to wear and can adapt to pets of various sizes. The anti-sliding block prevents the fixed restraint belt from rotating, causing the signal acquisition module to be away from the heart of the pet, resulting in signal acquisition failure, weak signal strength and other problems;

[0043] (5) The U-shaped buckle is connected to the safety lock slot to prevent the fixed restraint belt and the connecting belt from falling off. The magnetic attraction between the magnetic buckle and the magnetic buckle slot provides tension between the fixed restraint belt and the connecting belt. The thrust column provides tension for the U-shaped buckle under the action of the tension spring. The end of the U-shaped buckle and the magnetic buckle tend to move towards each other, making the connection between the fixed restraint belt and the connecting belt more secure. At the same time, the magnetic attraction force and the tension of the tension spring can both play a buffering role, so that the fixed restraint belt and the connecting belt are securely connected without restricting the movement of the pet. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of the present invention, and do not constitute a limitation on the embodiments of the present invention;

[0045] Figure 1 It is a schematic diagram of the overall structure of the device in the present invention;

[0046] Figure 2 It is an exploded view of the monitoring component structure installed on the connecting belt in the present invention;

[0047] Figure 3 It is a schematic diagram of the structure of the fixed restraining belt in the present invention;

[0048] Figure 4 is a schematic diagram of wearing the device in the present invention;

[0049] Figure 5 It is a schematic diagram of the connecting structure of the connecting belt in the present invention;

[0050] Figure 6 It is a schematic diagram of the magnetic buckle structure of the present invention;

[0051] Figure 7 yes Figure 6 A magnified image of the middle part;

[0052] Figure 8 It is a cross-sectional view of the magnetic buckle structure of the present invention;

[0053] Fig. 9 It is a cross-sectional view of the magnetic buckle slide groove and the safety lock slide groove of the present invention;

[0054] Fig.10 is a diagram of a pet health monitoring method in the present invention;

[0055] Among them, 1-fixed restraint belt, 2-anti-slip buckle, 3-anti-sliding block, 4-connecting belt, 401-first connecting belt, 402-second connecting belt, 501-magnetic buckle slide groove, 502-safety lock slide groove, 6-Velcro, 7-U-shaped buckle, 8-magnetic buckle, 9-safety lock buckle, 10-slide plate, 11-slide groove, 12-slide rail, 13-thrust column, 14-slide rod, 15-tension spring, 16-lock buckle inner slot, 17-slide slot, 18-ECG sensor, 19-signal amplification module, 20-A / D conversion module, 21-positioning module, 22-signal denoising module, 23-D / A conversion module, 24-wireless communication module. DETAILED DESCRIPTION

[0056] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0057] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those within the scope of this description. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0058] Example 1

[0059] This embodiment provides a device based on pet health monitoring, such as Figure 1-Figure 10 As shown, it includes two fixed restraint belts 1 fixed to the pet's body surface, a connecting belt 4 connecting the two fixed restraint belts 1 and a monitoring component installed on the upper surface of the connecting belt 4, the monitoring component is in contact with the pet's body surface, and the monitoring component includes a positioning module 21 and a signal acquisition module, a signal amplification module 19, an A / D conversion module 20, a signal denoising module 22, a D / A conversion module 23 and a wireless communication module 24 that are sequentially connected in signal connection, the positioning module 21 is signal connected to the D / A conversion module 23, and the wireless communication module 24 is signal connected to the control terminal.

[0060] Among them, the two fixed restraint belts 1 are preferably worn on the pet's neck and chest respectively, so that the connecting belt 4 is located close to the pet's heart, and the detection end of the monitoring component is in contact with the pet's body surface to collect the pet's electrocardiogram signal. The electrocardiogram signal is converted into a digital signal after passing through the signal amplification module 19 and the A / D conversion module 20. The digital signal is converted back into an analog signal after passing through the signal denoising module 22 and the D / A conversion module 23, and is transmitted to the control terminal through the wireless communication module 24, which is convenient for the user to observe at any time. The positioning module 21 can be GPS, Beidou, etc.

[0061] In a more preferred embodiment, the signal acquisition module includes an MCU and a plurality of electrocardiogram sensors 18 , the electrocardiogram sensors 18 are all signal-connected to the MCU, and the MCU is signal-connected to the signal amplification module 19 .

[0062] Among them, the MCU adopts a high-speed, low-power microcontroller unit, and the number of the ECG sensors 18 is arbitrary and determined according to the pet monitoring needs. The ECG sensors 18 are arranged in a rectangular array to increase the ECG collection range of the pet's heart. For example, 40 ECG sensors 18 are arranged in two rows of 2×20;

[0063] The ECG signal collected by the ECG sensor 18 is transmitted to the MCU, and the MCU only takes the signal strengths of 40 signals Rss1, Rss2, Rss3...Rss 40 It is stored as a variable in the C++STL priority queue priority_queue. The queue is implemented using a heap. The default max-heap is the maximum value. The time complexity of the whole process is O(log40). The iterator iterator then traverses the 40 elements in the heap from top to bottom and reports the signal strength Rss of each traversal. i The corresponding complete signal is subjected to signal integrity detection. When the number of signals that meet the conditions n>2 is detected, pruning is performed and the traversal is cut off. The time complexity of the worst case traversal is O(40), and the total time complexity of the worst case is O(40log40). The processed ECG signal is then transmitted to the signal amplification module 19.

[0064] In a more preferred embodiment, the signal amplification module 19 includes a preamplifier circuit, a low-pass filter circuit, a high-pass filter circuit and a post-amplifier circuit.

[0065] The preamplifier circuit uses the AD620AN operational amplifier chip with high input impedance, high common mode rejection ratio and low drift properties to input the signal in the form of differential mode. The AD620AN chip is an 8-pin integrated operational amplifier, so the gain is controlled by the resistor between pin 1 and pin 8. The gain G1 of the preamplifier circuit is as follows:

[0066]

[0067] Where: Rg is the internal reference resistor, usually recorded as 49.4kΩ, R1 / / R2 is the actual resistor that controls the gain;

[0068] The low-pass filter circuit and the high-pass filter circuit form a band-pass filter circuit. The band-pass filter circuit adopts an active two-stage filter design. Since the main frequency range of the ECG signal is 0.5Hz~100Hz, the operational amplifier TL082CM chip with a wider frequency band is selected. In the complex admittance analysis, the transfer function of the low-pass filter is:

[0069]

[0070] After simplification, the cutoff frequency is:

[0071]

[0072] Among them: The complex admittance analysis of the transfer function adopts Laplace transform analysis, A uo is the operational amplifier gain factor, Q is the quality factor, C1 and C2 are low-pass filter capacitors, R4 and R5 are non-inverting input resistors, and s is the independent variable in the Laplace transform, that is, the exponential power corresponding to the original transfer function when it is expressed in exponential form;

[0073] Similarly, in the complex admittance analysis of the high-pass filter, the cutoff frequency ω is:

[0074]

[0075] Among them: C3 and C4 are high-pass filter capacitors, R6 and R7 are common-phase input resistors;

[0076] The post-amplifier circuit uses an operational amplifier chip OP07AJ with low bias voltage and low drift. In this embodiment, the gain of the OP07AJ chip is determined by R9 and R 10 Control, so the post-amplifier circuit gain G2 is as follows:

[0077]

[0078] Where: R9 is the inverting input resistance, R 10 is the negative feedback resistor;

[0079] Since the gains of the filters in the high-pass filter circuit and the low-pass filter circuit are very small and can be ignored, the total gain G of the signal amplification module 19 is: G=G1×G2=420.5.

[0080] In a more preferred embodiment, the connecting belt 4 includes a first connecting belt 401 and a second connecting belt 402 arranged parallel to each other, the first connecting belt 401 is used to fit the pet's body surface, the electrocardiogram sensor 18 is evenly installed on the first connecting belt 401, and the signal amplification module 19, A / D conversion module 20, signal denoising module 22, D / A conversion module 23, positioning module 21 and wireless communication module 24 are all embedded in the second connecting belt 402.

[0081] Among them, the first connecting belt 401 and the second connecting belt 402 are large and small shells and covers, and the signal amplification module 19, the A / D conversion module 20, the signal denoising module 22, the D / A conversion module 23, the positioning module 21 and the wireless communication module 24 are all embedded in the second connecting belt 402 which serves as the shell, and the first connecting belt 401 is covered to protect it. The rectangular array of electrocardiogram sensors 18 is arranged on the first connecting belt 401.

[0082] Example 2

[0083] On the basis of Example 1, Figure 1-Figure 10 As shown, it also includes an anti-slip buckle 2, a Velcro 6 installed on the outside of the fixed restraint belt 1 and a plurality of anti-sliding blocks 3 installed on the inside of the fixed restraint belt 1. One end of the fixed restraint belt 1 passes through the anti-slip buckle 2 and is fixed by the Velcro 6. The anti-sliding block 3 is used to contact the pet's body surface.

[0084] Among them, the fixed restraint belt 1 is made of soft material, preferably cloth, nylon, etc. The size of the anti-slip buckle 2 is the same as the size of the end of the fixed restraint belt 1, that is, the end of the fixed restraint belt 1 can pass through the anti-slip buckle 2, and the round hair end and the barbed end of the Velcro 6 are both located on the outside of the fixed restraint belt 1. When the fixed restraint belt 1 passes through the anti-slip buckle 2, the round hair end and the barbed end of the Velcro 6 are respectively located on both sides of the anti-slip buckle 2. The number of anti-slip blocks 3 is arbitrary, and it is preferably made of silicone, rubber, etc.

[0085] In a more preferred embodiment, a magnetic buckle slot 501 and a safety lock slot 502 are provided on the side wall of the fixed restraint belt 1, and both ends of the connecting belt 4 are provided with a magnetic buckle 8 magnetically connected to the magnetic buckle slot 501 and a safety lock buckle 9 matching the safety lock slot 502.

[0086] Among them, the width of the magnetic buckle slot 501 is equal to the width of the magnetic buckle 8, and the length of the magnetic buckle slot 501 is greater than the length of the magnetic buckle 8, which is convenient for adjusting the position of the connecting belt 4 in the lateral direction. The width of the safety lock slot 50 is equal to the width of the safety lock buckle 9, and the length of the safety lock slot 502 is greater than the length of the safety lock buckle 9.

[0087] In a more preferred embodiment, the magnetic buckle 8 includes a slide rail 12 installed on both sides of the lower end of the magnetic buckle 8, a slide rod 14 arranged parallel to the slide rail 12, a tension spring 15 with one end fixed to the slide rail 12 and the other end passing through the slide rod 14, and a thrust column 13 sleeved on the slide rod 14 and connected to the tension spring 15, the safety lock 9 includes a U-shaped buckle 7 and a slide plate 10 hinged to the U-shaped buckle 7, the top of the thrust column 13 is fixedly connected to the slide plate 10, and a sliding groove 11 is provided on the side of the slide plate 10 away from the thrust column 13, and the end of the slide plate 10 away from the U-shaped buckle 7 is embedded in the connecting belt 4 and can slide.

[0088] Among them, the slide rail 12 is a groove-type slide rail, the slide rod 14 is embedded in the groove and the two ends of the slide rod 14 are fixedly connected to the side walls of the groove at both ends, the length of the tension spring 15 is less than the length of the slide rod 14, leaving an elongated space, the thrust column 13 slides in the slide rail, and the thrust column 13 is fixedly connected to one end of the slide plate 10 close to the U-shaped buckle 7. The slide groove 11 is used for finger contact and pushing, that is, the end face of the slide groove 11 close to the U-shaped buckle 7 is perpendicular to the surface of the slide plate 10, which is convenient for pushing, and a groove for accommodating the slide plate 10 is opened inside the connecting belt 4.

[0089] In a more preferred embodiment, a lock buckle inner slot 16 is provided on the U-shaped inner side of the U-shaped buckle 7, a U-shaped groove matching the U-shaped buckle 7 is provided inside the safety lock slide groove 502, and a plurality of slide groove inner slots 17 matching the lock buckle inner slot 16 are provided on the side wall of the U-shaped groove.

[0090] Among them, the card slot 16 in the lock buckle and the card slot 17 in the slide slot are preferably set as rectangular slots, the size and spacing of the card slot 16 in the lock buckle and the card slot 17 in the slide slot are equal, and they cooperate with each other through misalignment to achieve the purpose of lateral limitation. The number of card slots 16 in the lock buckle is less than the number of card slots 17 in the slide slot, and the number of card slots 16 in the lock buckle is arbitrary.

[0091] Example 3

[0092] Based on any of the above embodiments, Fig.10 As shown, the following steps are included:

[0093] S1: Fix two fixed restraint belts 1 on the pet's chest and neck respectively;

[0094] S2: adjusting the position and length of the connecting belt 4 so that the signal acquisition module on the connecting belt 4 is close to the pet's body surface;

[0095] S3: The collected ECG signal and positioning signal are sequentially processed by the signal amplification module 19, the A / D conversion module 20, the signal denoising module 22, the D / A conversion module 23 and the wireless communication module 24 and transmitted to the control terminal.

[0096] In a more preferred embodiment, the signal denoising module 22 receives the output signal of the A / D conversion module 20, and performs correlation function denoising on the received output signal by the following formula:

[0097]

[0098] Where: e(t) is the output signal of the A / D conversion module 20, R ee (t) is the autocorrelation function of e(t), T is the cardiac cycle, τ is the integral independent variable, is the average autocorrelation function, M is the average window size, t is the independent variable of the autocorrelation function, e(τ) is the input signal at time τ, e(τ-t) is the input signal at time τ-t, and e(-t) is the signal after the input signal is deconvoluted;

[0099] S302, the signal denoised by the correlation function is subjected to secondary processing by the following wavelet transform formula:

[0100]

[0101] Where: x(t) is the output signal, a is the scale, b is the time, h (a,b) (t) is the form of the wavelet function after translation and scaling at scale a and time b, Y (a,b) is the processed wavelet coefficient, h (a,b) (t) The result after substituting scale a and time b;

[0102] S303 , output x(t) to the D / A conversion module 23 .

[0103] Among them, the denoising system adopts the LTI causal system, which is only meaningful in the range of t>0. Since the ECG signal is a periodic signal, the correlation function can be used to process the periodic signal well. Assume that the excitation of the input signal denoising module 22 after amplification is e(t), which contains the original signal x(t) and the noise u(t), that is:

[0104] e(t)=k1x(t)+k2u(t);

[0105]

[0106] Wherein: e(t) is the output signal of the A / D conversion module 20, e(t)*e(-t) represents the convolution operation of e(t) and e(-t), k1, k2, m1 and m2 are arbitrary constants, is the average autocorrelation function, x(t) is the output signal, r(t) is the noise after one processing, and the signal strength Rss corresponding to r(t) is (r) Less than the signal strength Rss corresponding to the initial noise u(t) (u) ;

[0107] Since the ECG signal has uncertainty in mutations and more details need to be extracted, it is preferred to use the Daubechies wavelet function as the wavelet basis function in the wavelet transform, and use the D4 wavelet in the Daubechies wavelet function to perform wavelet transform on the signal. Decompose into wavelet coefficients:

[0108]

[0109] Where: h(t) is the D4 wavelet used in this embodiment, u(t) is the unit function, a is the scale, b is the time, h (a,b) (t) is the result of translation transformation of the D4 wavelet at scale a and time b, X (a,b) is the wavelet coefficient, τ is the integral independent variable, m1 and m2 are constants;

[0110] In this embodiment, the SureShrink threshold is selected to process the wavelet coefficients, and the noise coefficients in the wavelet coefficients are weakened while retaining the useful information in the signal. The formula is as follows:

[0111]

[0112] Where: H represents the threshold, n represents the length of the signal, and in this embodiment, the unit period is used as the fixed sampling time, that is, n=T, and σ represents the mixed standard deviation of the noise, where:

[0113]

[0114] Among them: r1, r2, r3…r N is the noise r(t) in the corresponding sampling period T, μ is the average value of r(t) in the sampling time, and N is the number of samples;

[0115] The threshold H calculated above is used to calculate the wavelet coefficient X (a,b) Processing, X (a,b) The absolute value of X is less than H, and the part of X is set to zero. (a,b) The part whose absolute value is greater than H will be retained, and the processed wavelet coefficient is Y (a,b);

[0116] The inverse continuous wavelet transform is used to process the wavelet coefficients after threshold processing and reconstruct the original signal. When the input excitation is e(t)=k1x(t)+k2u(t), the output obtained by the signal denoising module 22 is x(t).

[0117] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0118] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A device based on pet health monitoring, characterized in that: The device based on pet health monitoring comprises two fixed restraint belts (1) fixed to the pet's body surface, a connecting belt (4) connecting the two fixed restraint belts (1) and a monitoring component installed on the upper surface of the connecting belt (4), wherein the monitoring component is used to fit the pet's body surface, the monitoring component comprises the positioning module (21) and the signal acquisition module, and also comprises a signal amplification module (19), an A / D conversion module (20), a signal denoising module (22), a D / A conversion module (23) and a wireless communication module (24) which are sequentially connected to the signal acquisition module, the positioning module (21) is connected to the D / A conversion module (23) by signal, and the wireless communication module (24) is connected to the control terminal by signal; The side wall of the fixed restraint belt (1) is provided with a magnetic buckle slot (501) and a safety lock slot (502), and both ends of the connecting belt (4) are provided with a magnetic buckle (8) magnetically connected to the magnetic buckle slot (501) and a safety lock buckle (9) matching the safety lock slot (502); The magnetic buckle (8) comprises a slide rail (12) installed on both sides of the lower end of the magnetic buckle (8), a slide rod (14) arranged parallel to the slide rail (12), a tension spring (15) with one end fixed on the slide rail (12) and the other end passing through the slide rod (14), and a thrust column (13) sleeved on the slide rod (14) and connected to the tension spring (15); the safety lock buckle (9) comprises a U-shaped buckle (7) and a slide plate (10) hinged to the U-shaped buckle (7); the top end of the thrust column (13) is fixedly connected to the slide plate (10); a sliding groove (11) is provided on a side of the slide plate (10) away from the thrust column (13); and an end of the slide plate (10) away from the U-shaped buckle (7) is embedded in the interior of the connecting belt (4) and can slide; The device based on pet health monitoring includes the following steps: S1: Wearing a monitoring device on the pet's chest, the monitoring device comprising a positioning module and a signal acquisition module; S2: Adjust the position of the monitoring device so that the signal acquisition module on the monitoring device is close to the pet's body surface; S3: transmitting the collected ECG signal and positioning signal to the control terminal after signal processing, wherein the signal processing includes a signal amplification step, an A / D conversion step, a signal denoising step and a D / A conversion step; The signal denoising step comprises: S301, performing correlation function denoising on the signal after A / D conversion: Where: e(t) is the output signal after A / D conversion, R ee (t) is the autocorrelation function of e(t), T is the cardiac cycle, τ is the integral independent variable, is the average autocorrelation function, M is the average window size; t is the independent variable of the autocorrelation function; e(τ) is the input signal at time τ; e(τ-t) is the input signal at time τ-t; e(-t) is the signal after the input signal is deconvoluted; S302, the signal denoised by the correlation function is subjected to secondary processing by the following wavelet transform formula: Where: x(t) is the output signal, a is the scale, b is the time, h (a,b) (t) is the form of the wavelet function after translation and scaling at scale a and time b, Y (a,b) is the processed wavelet coefficient, h (a,b) (t) The result after substituting scale a and time b; S303, convert x(t) into an analog / digital signal and output it.

2. A device based on pet health monitoring according to claim 1, characterized in that: The signal acquisition module comprises an MCU and a plurality of electrocardiogram sensors (18), wherein the electrocardiogram sensors (18) are all signal-connected to the MCU, and the MCU is signal-connected to the signal amplification module (19).

3. The device based on pet health monitoring according to claim 1, characterized in that: The signal amplification module (19) comprises a preamplification circuit, a low-pass filtering circuit, a high-pass filtering circuit and a post-amplification circuit.

4. The device based on pet health monitoring according to claim 2, characterized in that: The connecting belt (4) comprises a first connecting belt (401) and a second connecting belt (402) which are arranged in parallel with each other, the first connecting belt (401) is used to fit the body surface of the pet, the electrocardiogram sensor (18) is evenly installed on the first connecting belt (401), and the signal amplification module (19), the A / D conversion module (20), the signal denoising module (22), the D / A conversion module (23), the positioning module (21) and the wireless communication module (24) are all embedded in the second connecting belt (402).

5. The device based on pet health monitoring according to claim 1, characterized in that: It also comprises an anti-slip buckle (2) and a Velcro (6) installed on the outside of the fixed restraint belt (1), and a plurality of anti-slip slide blocks (3) installed on the inside of the fixed restraint belt (1); one end of the fixed restraint belt (1) passes through the anti-slip buckle (2) and is fixed by the Velcro (6); the anti-slip slide block (3) is used to contact the body surface of the pet.

6. The device based on pet health monitoring according to claim 1, characterized in that: The U-shaped inner side of the U-shaped buckle (7) is provided with a buckle inner slot (16), the interior of the safety lock slide groove (502) is provided with a U-shaped groove matching the U-shaped buckle (7), and the side wall of the U-shaped groove is provided with a plurality of slide groove inner slots (17) matching the buckle inner slot (16).

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