Signal simulation system, method and device, electronic equipment, storage medium and program product

Abstract

The invention relates to a signal simulation system, method and device, electronic equipment, a storage medium and a program product. The system comprises bionic skin, a liquid crystal diaphragm, a light source, a signal generation assembly and a signal processing assembly, wherein the liquid crystal diaphragm is arranged in the bionic skin, the signal generation assembly is connected with the liquid crystal diaphragm, and the light source is used for irradiating the bionic skin; the signal generation assembly is used for generating a driving electric signal and driving the liquid crystal diaphragm to simulate the absorption of blood to the light source through the driving electric signal; the signal processing assembly is used for collecting light signals reflected by the bionic skin after being absorbed by the simulated light of the liquid crystal diaphragm and converting the light signals into physiological electric signals. By means of the system, the accuracy and reliability of physiological electric signal simulation can be improved, and innovative design, detailed performance verification and efficient debugging processes of products in the health field are facilitated.

Description

Technical Field

[0001] This disclosure relates to the field of signal processing technology, and in particular to a signal simulation system and method, apparatus, electronic device, storage medium, and program product. Background Technology

[0002] Photoplethysmography (PPG) is a non-invasive technique that monitors changes in blood volume by detecting changes in the absorption or reflection of light at body surface sites (such as fingertips, earlobes, or forearms), thereby enabling the monitoring of physiological parameters such as heart rate and blood oxygen saturation. In the development of wearable devices and the advancement of biomedical research, it is often necessary to simulate PPG signals under different physiological conditions. This allows device developers to pre-test and optimize algorithms in a laboratory environment, improving the accuracy and adaptability of their products, or providing biomedical researchers with a wealth of data samples. Therefore, accurately simulating diverse PPG signals is of significant research value. Summary of the Invention

[0003] To overcome the problems existing in related technologies, this disclosure provides a signal simulation system and method, apparatus, electronic device, storage medium, and program product.

[0004] According to a first aspect of the present disclosure, a signal simulation system is provided, the system comprising: bionic skin, a liquid crystal film, a light source, a signal generation component, and a signal processing component; wherein, the liquid crystal film is disposed inside the bionic skin, the signal generation component is connected to the liquid crystal film, and the light source is used to irradiate the bionic skin;

[0005] The signal generation component is used to generate a driving electrical signal and drive the liquid crystal film to simulate the absorption of the light source by blood through the driving electrical signal;

[0006] The signal processing component is used to collect the light signal reflected by the bionic skin after it is absorbed by the liquid crystal film, and to convert the light signal into a physiological electrical signal.

[0007] In some embodiments, the bionic skin is formed by stacking multiple elastic membranes, which are used to simulate the various tissue layers of the skin, and the liquid crystal membrane is disposed between the elastic membranes corresponding to the dermal layer.

[0008] In some embodiments, the signal generation component includes:

[0009] The signal modulation module is used to modulate and generate the initial electrical signal;

[0010] An amplification module is used to amplify the initial electrical signal to generate the driving electrical signal.

[0011] In some embodiments, the signal modulation module includes:

[0012] A signal generator is used to generate the signal to be modulated.

[0013] An envelope generator is used to perform amplitude modulation on the signal to be modulated.

[0014] A frequency modulator, used to perform frequency modulation on the signal to be modulated;

[0015] A signal converter is used to convert the digital signal after amplitude and frequency modulation of the signal to be modulated into the initial electrical signal.

[0016] In some embodiments, the signal generation component further includes:

[0017] A noise generation module is connected between the signal modulation module and the amplification module to generate a noise signal that interferes with the initial electrical signal.

[0018] According to a second aspect of the present disclosure, a signal simulation method is provided, the method comprising:

[0019] A driving electrical signal is generated by modulation; wherein the driving electrical signal is used to drive the liquid crystal film in the bionic skin to simulate the absorption of light source by blood;

[0020] The physiological electrical signal is obtained by converting the light signal reflected by the bionic skin; wherein the light signal reflected by the bionic skin is obtained by reflecting light after simulated light absorption by the liquid crystal film;

[0021] Based on the driving electrical signal and the physiological electrical signal, the accuracy of the signal simulation is determined; wherein, the accuracy of the signal simulation characterizes the fit between the physiological electrical signal and the driving electrical signal.

[0022] In some embodiments, the modulation generation of the driving electrical signal includes:

[0023] Modulation generates the initial electrical signal;

[0024] The initial electrical signal is amplified to generate the driving electrical signal.

[0025] In some embodiments, the modulation generates the initial electrical signal, including:

[0026] Generate the signal to be modulated;

[0027] The signal to be modulated is subjected to amplitude modulation and frequency modulation;

[0028] The digital signal obtained by amplitude and frequency modulation of the signal to be modulated is converted into the initial electrical signal.

[0029] In some embodiments, the method further includes:

[0030] Generate noise signals that interfere with the initial electrical signal;

[0031] The step of amplifying the initial electrical signal to generate the driving electrical signal includes:

[0032] The initial electrical signal is amplified and generated based on the noise signal interfering with it.

[0033] In some embodiments, determining the accuracy of the signal simulation based on the driving electrical signal and the physiological electrical signal includes:

[0034] Obtain statistical feature data of the waveform corresponding to the physiological electrical signal;

[0035] The accuracy of the signal simulation is determined based on the statistical feature data and the modulation information of the driving electrical signal.

[0036] According to a third aspect of the present disclosure, a signal simulation apparatus is provided, the apparatus comprising:

[0037] The first generation module is configured to modulate and generate a driving electrical signal; wherein the driving electrical signal is used to drive the liquid crystal film in the bionic skin to simulate the absorption of light source by blood;

[0038] The acquisition module is configured to acquire a physiological electrical signal after converting the light signal reflected by the bionic skin; wherein the light signal reflected by the bionic skin is obtained by reflecting light after simulated light absorption by the liquid crystal film;

[0039] The determination module is configured to determine the accuracy of the signal simulation based on the driving electrical signal and the physiological electrical signal; wherein the accuracy of the signal simulation characterizes the fit between the physiological electrical signal and the driving electrical signal.

[0040] In some embodiments, the first generation module is further configured to modulate and generate an initial electrical signal; and to amplify the initial electrical signal to generate the driving electrical signal.

[0041] In some embodiments, the first generation module is further configured to generate a signal to be modulated; perform amplitude modulation and frequency modulation on the signal to be modulated; and convert the digital signal after amplitude and frequency modulation of the signal to be modulated into the initial electrical signal.

[0042] In some embodiments, the apparatus further includes:

[0043] The second generation module is configured to generate a noise signal that interferes with the initial electrical signal;

[0044] The first generation module is further configured to amplify and generate the driving electrical signal based on the noise signal interfering with the initial electrical signal.

[0045] In some embodiments, the determining module is further configured to acquire statistical feature data of the waveform corresponding to the physiological electrical signal; and determine the accuracy of the signal simulation based on the statistical feature data and the modulation information of the driving electrical signal.

[0046] According to a fourth aspect of the present disclosure, an electronic device is provided, comprising:

[0047] processor;

[0048] Memory used to store computer programs or instructions;

[0049] The processor executes the computer program or instructions to implement the steps of the method described in the second aspect of the present disclosure.

[0050] According to a fifth aspect of the present disclosure, a non-transitory computer-readable storage medium is provided, the storage medium storing a computer program or instructions that, when executed by a processor, implement the steps of the method described in the second aspect of the present disclosure.

[0051] According to a sixth aspect of the present disclosure, a computer program product is provided, including a computer program or instructions, which, when executed by a processor, implement the steps of the method described in the second aspect of the present disclosure.

[0052] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0053] The system in this embodiment uses bionic skin to simulate human skin. The liquid crystal film inside the bionic skin can sensitively respond to the adjustment of the driving electrical signal to dynamically adjust the light source absorption characteristics, thereby dynamically simulating the subtle optical changes brought about by the blood flow process in human skin under complex physiological conditions. The system collects the light signal reflected after the light source is absorbed by the bionic skin and converts it into physiological electrical signals, making the simulated physiological electrical signals closer to the human physiological state and improving the accuracy and reliability of the simulation. In addition, the signal generation component in the system can flexibly adjust the driving electrical signal applied to the liquid crystal film to generate diverse physiological electrical signals, which helps physiological electrical signals play a more important role in the product design, performance verification and debugging process in the health field.

[0054] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0055] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0056] Figure 1 This is a system structure diagram illustrating PPG signal acquisition in a smart wearable device according to an exemplary embodiment.

[0057] Figure 2 This is a schematic diagram illustrating the principle of PPG signal acquisition in a smart wearable device according to an exemplary embodiment.

[0058] Figure 3 This is a schematic diagram illustrating a PPG signal variation according to an exemplary embodiment.

[0059] Figure 4 This is a waveform diagram of a PPG signal according to an exemplary embodiment.

[0060] Figure 5 This is a schematic diagram of the structure of a PPG signal simulation system according to an exemplary embodiment.

[0061] Figure 6 This is a schematic diagram illustrating the manufacturing principle of a biomimetic skin according to an exemplary embodiment.

[0062] Figure 7 This is a schematic diagram illustrating the optical property control of a liquid crystal film according to an exemplary embodiment.

[0063] Figure 8 This is a waveform diagram of a driving electrical signal according to an exemplary embodiment.

[0064] Figure 9 This is a schematic diagram illustrating a PPG signal simulation according to an exemplary embodiment.

[0065] Figure 10 This is a waveform of a PPG signal simulation according to an exemplary embodiment. Figure 1 .

[0066] Figure 11 This is a waveform of a PPG signal simulation according to an exemplary embodiment. Figure 2 .

[0067] Figure 12 This is a flowchart illustrating a signal simulation method according to an exemplary embodiment.

[0068] Figure 13 This is a flowchart illustrating a PPG signal simulation according to an exemplary embodiment.

[0069] Figure 14 This is a schematic diagram illustrating a PPG signal simulation according to an exemplary embodiment.

[0070] Figure 15 This is a block diagram illustrating a signal simulation device according to an exemplary embodiment.

[0071] Figure 16 This is a block diagram illustrating an electronic device according to an exemplary embodiment. Detailed Implementation

[0072] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0073] In recent years, PPG technology has been widely used in the field of smart wearable devices. Figure 1 This is a system architecture diagram illustrating PPG signal acquisition in a smart wearable device according to an exemplary embodiment. Figure 2 This is a schematic diagram illustrating the principle of PPG signal acquisition in a smart wearable device according to an exemplary embodiment. Figure 1 As shown, L1 represents a smart wearable device, such as a smartwatch or smart bracelet, while L2 represents human skin. The wearable device L1 includes a light-emitting diode (LED) and a photodetector (PD). The LED, acting as a light source, emits red light (approximately 660nm wavelength) and infrared light (approximately 940nm wavelength) that penetrates the biological tissues within human skin L2. The PD is typically a photodiode used to receive light reflected or transmitted through the tissue, measure changes in light intensity, and convert the resulting optical signal into an electrical signal for output. Figure 1 As can be seen, human skin L2 includes Layer 1-Layer 6, corresponding to... Figure 2 The human skin layers shown in (a) are Layer 1-Layer 6, which represent the epidermis, capillary loops, upper limb nerve plexus, dermis, deep plexus, and subcutaneous tissue, respectively. Figure 2 (b) corresponds to Figure 1During the PPG signal acquisition process, the LED in L1 emits light that shines on human skin L2. Part of the light is absorbed by human skin L2 and the blood in human skin L2, while the remaining part is reflected back by human skin L2 and collected by the detector PD.

[0074] Hemoglobin in the blood is the main light-absorbing substance in the L2 layer of human skin. As the heart pumps blood, the volume of blood in the arteries of the L2 layer of human skin changes periodically. Correspondingly, the concentration of hemoglobin in the blood also changes periodically, and thus the light absorption characteristics also change periodically. Figure 3 This is a schematic diagram illustrating a PPG signal variation according to an exemplary embodiment, such as... Figure 3 As shown in (b), when the heart contracts, blood is pushed to the distal end of the blood vessels, causing the blood volume in the arteries to increase. Consequently, the absorption rate of light also increases, resulting in a decrease in the amount of light measured by the detector. Figure 3 As shown in (c), when the heart relaxes, the volume of blood in the arteries decreases, the concentration of hemoglobin in the blood also decreases, and the blood absorbs less light, so the detector measures an increase in the amount of light. The detector PD converts the measured light amount into electrical signals, which are the PPG signals. Figure 2 (c) corresponds to Figure 3 In (a), such as Figure 3 As shown in (a), L3 represents the change in PPG signal caused by the change in arterial blood volume during the heart's pumping process. Since the light signal measured by the detector PD exhibits periodic changes, the waveform of the PPG signal component represented by L3 will also exhibit periodic changes. L4 represents the change in PPG signal caused by the absorption of light by veins in the skin (L2). L5 represents the change in PPG signal caused by the absorption of light by other tissues in the skin (L2). The waveform of the PPG signal can reflect the true physiological activity state of the human heart. Based on the waveform of the PPG signal, relevant physiological health parameters, such as heart rate and blood oxygen saturation, can be monitored.

[0075] Among related technologies, there exists a PPG signal simulation system based on vascular flow control. Its core relies on a programmable pump system to periodically perfuse an optical phantom with liquid. This optical phantom is an experimental model already in use to simulate the optical properties of biological tissues. However, the fundamental limitation of this method lies in the significant difference between its principle and the actual generation mechanism of PPG signals. Real PPG signals are generated by the periodic flow of blood in the small arteries of the dermis driven by the heartbeat, rather than the direct action of large arteries. This flow is not only directly affected by the heartbeat but also finely regulated by various physiological factors (such as vascular elasticity, blood composition, and surrounding tissue pressure). Therefore, real human PPG signals typically contain multiple frequency components and complex waveform characteristics. Figure 4 This is a waveform diagram of a PPG signal according to an exemplary embodiment, such as... Figure 4 As shown, S1 represents the peak value during cardiac systole, S2 represents the peak value during diastole, S3 represents the notch amplitude, S4 represents the systolic slope, S5 represents the diastolic slope, S6 represents the duration of the rising phase, S7 represents the duration of the falling phase, S8 represents the peak width during systole, and S9 represents the peak width during diastole. These detailed waveform characteristics not only directly reflect the immediate physiological state of the human body but also serve as a rich carrier of deeper health information. In contrast, simulation methods that rely on external mechanical devices (such as water pumps) to periodically perfuse optical phantoms, while able to simulate the periodicity of blood flow to some extent, struggle to fully reproduce the complex dynamic characteristics of blood flow in a real physiological environment and its interaction with surrounding tissues.

[0076] While the aforementioned PPG signal simulation method based on water pump systems has its applications, it has significant shortcomings in pursuing high-fidelity simulation and richness of physiological information, leaving room for further improvement.

[0077] In response, this disclosure provides a signal simulation system. Figure 5 This is a schematic diagram illustrating the structure of a PPG signal simulation system 500 according to an exemplary embodiment, such as... Figure 5 As shown, the system includes: a bionic skin 51, a liquid crystal film 52, a light source 53, a signal generation component 54, and a signal processing component 55; wherein, the liquid crystal film 52 is disposed inside the bionic skin 51, the signal generation component 54 is connected to the liquid crystal film 52, and the light source 53 is used to irradiate the bionic skin 51.

[0078] The signal generation component 54 is used to generate a driving electrical signal and drive the liquid crystal film 52 to simulate the absorption of the light source 53 by blood through the driving electrical signal;

[0079] The signal processing component 55 is used to collect the light signal reflected by the bionic skin 51 after it is absorbed by the liquid crystal film 52, and to convert the light signal into a physiological electrical signal.

[0080] In this embodiment of the disclosure, the bionic skin 51 in the signal simulation system is typically made of polymer materials or other biocompatible materials, and has good flexibility and appearance, feel and optical properties similar to real skin. Figure 6 This is a schematic diagram illustrating the manufacturing principle of a biomimetic skin according to an exemplary embodiment. For example... Figure 6 As shown, Figure 6 In (a) and (b), the various biological tissue layers of human skin are shown. Figure 6 (c) represents biomimetic skin that simulates the various biological tissue layers in human skin. Figure 6 Figure (d) shows the absorption rate curves of human skin for different wavelengths of light. In the process of making bionic skin, by continuously adjusting the materials and structural design of the bionic skin, and using appropriate processes, a bionic skin model that meets the light absorption characteristics of the human skin layer can be prepared.

[0081] In this embodiment, the light source 53 is used to irradiate the bionic skin 51, providing the necessary optical stimulation to the system. The light source 53 can be an LED light, a laser, etc., and the wavelength, intensity, and irradiation angle of the light source 53 can be adjusted according to actual needs to adapt to different simulation scenarios and experimental requirements. In this embodiment, when the light source 53 irradiates the bionic skin 51, the bionic skin 51 not only provides a medium for the light source to penetrate but also allows the light source 53 to irradiate the internal liquid crystal film 52.

[0082] In this embodiment, a liquid crystal film 52 is disposed inside the bionic skin 51 to regulate the absorption of the light source 53. The liquid crystal film 52 can be made of various types of liquid crystal materials, such as polymer-dispersed liquid crystal films, thin-film transistor liquid crystal films, or twisted nematic liquid crystal films. The liquid crystal film 52 possesses the unique photoelectric properties of liquid crystal materials, and its optical properties can be altered under electric fields, temperature, or other external stimuli, thereby achieving regulation of the absorption characteristics of the light source 53.

[0083] In some embodiments, the bionic skin 51 is formed by stacking multiple elastic membranes, which are used to simulate the various tissue layers of the skin, and the liquid crystal membrane 52 is disposed between the elastic membranes corresponding to the dermal layer.

[0084] The biomimetic skin 51 in this embodiment is composed of multiple elastic membranes stacked in a specific order. The elastic membranes, depending on their physical properties and the simulated object, represent different tissue layers of the skin, such as... Figure 6As shown in (c), in the bionic skin 51, elastic membrane F1 represents the epidermis of human skin tissue layer 1, elastic membrane F2 represents the capillary loops of human skin tissue layer 2, elastic membrane F3 represents the limb nerve plexus of human skin tissue layer 3, elastic membranes F4 and F5 represent the dermis of human skin tissue layer 4, F6 represents the deep plexus of human skin tissue layer 5, and F7 represents the subcutaneous tissue of human skin tissue layer 6. Among them, the dermis simulated by elastic membranes F4 and F5 may contain fibrous structures to provide support for the liquid crystal membrane 52. Figure 7 This is a schematic diagram illustrating the optical property control of a liquid crystal film according to an exemplary embodiment, such as... Figure 7 As shown in (a), the liquid crystal film L6 is also... Figure 5 Since most of the real PPG signals in the human body are generated by the periodic flow of blood in the small arteries of the dermis driven by the heartbeat, the liquid crystal film 52 can be set between the elastic films F4 and F5 corresponding to the dermis in the bionic skin 51 to simulate the absorption characteristics of the light source 53 by the flow of blood in the arteries of the dermis of human skin.

[0085] In this embodiment, the liquid crystal film L6 is also connected to a signal generation component 54, which is responsible for generating and outputting a driving electrical signal to the liquid crystal film L6. The signal generation component 54 can be composed of electronic devices such as a microcontroller and a signal generator. The signal generation component 54 can dynamically adjust the parameters (such as voltage and frequency) of the driving electrical signal according to a preset algorithm or external input to generate a driving electrical signal that conforms to the driving characteristics. Since the liquid crystal film L6 is sensitive to electrical signals, when the driving electrical signal output by the signal generation component 54 is applied to the liquid crystal film L6, the electric field effect of the driving electrical signal on the liquid crystal film L6 can cause the liquid crystal molecules in the liquid crystal film L6 to rearrange, thereby changing the absorption characteristics of the light source 53. Specifically, this can manifest as follows: Figure 7 As shown in (b), when a higher voltage is applied to the liquid crystal film L6, the electric field generated in the liquid crystal layer changes the arrangement of the liquid crystal molecules L7, causing them to change from a disordered or tilted state to a more orderly arrangement. This arrangement usually leads to a reduction in the scattering or polarization of light by the liquid crystal layer, thus allowing more light to pass directly through the liquid crystal layer and improving light transmittance. Figure 7 As shown in (c), when a low voltage is applied to the liquid crystal film L6, the liquid crystal molecules L7 may be in a disordered or tilted arrangement. In this state, the scattering effect of the liquid crystal layer on light is enhanced because when light passes through the liquid crystal layer, it will encounter liquid crystal molecules L7 arranged in different directions, which will cause the light scattering to be unable to pass through effectively, resulting in a low transmittance, i.e., a light absorption state.

[0086] Figure 8 This is a waveform diagram of a driving electrical signal according to an exemplary embodiment. For example... Figure 8 As shown, a sinusoidal waveform can be used as the driving electrical signal, directly applied to both ends of the liquid crystal film L6. Due to the inherent periodicity of the sinusoidal wave, this driving electrical signal can achieve periodic control of the state of the liquid crystal molecules L7. Specifically, as the sinusoidal wave signal changes, the arrangement and response of the liquid crystal molecules L7 also exhibit periodic adjustments, thereby achieving periodic changes in optical properties. In other words, the liquid crystal film L6 can be used to adjust the absorption rate of the light source according to the received driving electrical signal, thereby simulating the periodic changes in optical properties caused by changes in blood volume in the arteries when blood flows through human skin.

[0087] Based on the above, in order to simulate a PPG signal that matches the richness of physiological information in the human body, a specific driving electrical signal can be generated by the signal generation component 54 to drive the liquid crystal film L6 to adjust the absorption characteristics of the light source 53, so as to accurately simulate the absorption characteristics of blood to the light source under real physiological conditions. Figure 9 This is a schematic diagram illustrating a PPG signal simulation according to an exemplary embodiment. Figure 9 Figure (a) shows six typical PPG signal waveforms. Figure 9 (b) shows the signal generation component 54 selected according to the PPG signal generation requirements. Figure 9 (c) and (d) are based on Figure 9 (b) Two scenarios where the driving electrical signal generated by the signal generation component 54 modulates the arrangement of liquid crystal molecules L7 in the liquid crystal film L6 of the bionic skin 51. From Figure 9 It can be seen that, based on the generation requirements of PPG signals, the signal generation component 54 can be used to modulate and generate a driving electrical signal to adjust the arrangement of liquid crystal molecules L7 in the liquid crystal film L6 of the bionic skin 51, thereby changing the absorption characteristics of the liquid crystal film L6 to the light source, thus changing the light signal reflected by the bionic skin 51.

[0088] In this embodiment, the light source 53 illuminates the bionic skin 51. The signal processing component 55 is responsible for collecting the light signal reflected by the bionic skin 51 after simulated light absorption by the liquid crystal film L6, and converting it into a physiological electrical signal. The light signal collected by the signal processing component 55 is the residual light data after absorption by the bionic skin 51 and the liquid crystal film L6. The signal processing component 55 has a built-in photoelectric converter and signal processing circuit, which can capture changes in the light signal in real time and convert the light signal into a physiological electrical signal, namely the PPG signal, which is easy to analyze and process, through amplification, filtering, analog-to-digital conversion, and other processing steps. Figure 10 This is a waveform of a PPG signal simulation according to an exemplary embodiment. Figure 1 ,like Figure 10 As shown, Figure 10 (a) shows the light absorption characteristics of the bionic skin 51 simulated by driving the liquid crystal film L6 with a driving electrical signal. Figure 10 Figures (b) and (c) show the waveforms of the PPG signal obtained by the signal processing component 55 after the liquid crystal film L6 is driven by the driving electrical signal to simulate the absorption characteristics of blood to the light source 53. Figure 10 In (a), L9 represents the absorption characteristic component of the bionic skin 51 to the light source. For example, the material used to make the bionic skin 51 may contain materials with specific optical absorption characteristics, such as certain pigments, dyes, or nanoparticles, as well as multilayer structures or material layers of a specific thickness, which may enhance or weaken the absorption of light of a specific wavelength, corresponding to the formation of... Figure 10 (a) The DC component of the PPG signal, L10 is the component of the absorption characteristics of the liquid crystal film L6 to the light source 53, which is driven by the driving electrical signal to the liquid crystal film L6, and forms a corresponding component. Figure 10 (a) AC component of PPG signal. Figure 10 In (c), if two driving electrical signals with different phases can be applied to the liquid crystal film L6, such that after driving the liquid crystal film L6 with the driving electrical signals to simulate the light absorption characteristics of blood, the waveform of the PPG signal processed by the signal processing component 55 is opposite in phase.

[0089] It should be noted that the physiological electrical signals in the human body under real physiological conditions include not only the PPG signal components obtained by the absorption of light by blood and the PPG signal components formed by the absorption of light by the biological tissues of human skin, but also the PPG signal components formed by physiological activities such as respiration. Figure 11 This is a waveform of a PPG signal simulation according to an exemplary embodiment. Figure 2 ,like Figure 11 As shown, L111 is the PPG signal component formed by the bionic skin 51 simulating the absorption of light by human skin's biological tissue; L112 is the PPG signal component obtained by the liquid crystal film L6 in the bionic skin 51 simulating the absorption of light by blood, driven by a driving electrical signal, exhibiting periodic changes; L113 can represent the PPG signal component formed by other physiological activities such as human respiration. Figure 11 The amplitude of the PPG signal is the PPG signal value formed by the superposition of these three signal components.

[0090] Understandably, compared to the simulation methods based on water pump systems in related technologies, which cannot simulate the subtle optical changes brought about by blood flow in the human body under complex physiological conditions, the system in this embodiment uses a bionic skin 51 to simulate human skin. The liquid crystal film 52 set inside the bionic skin 51 can sensitively respond to the adjustment of the driving electrical signal to realize the dynamic adjustment of the absorption characteristics of the light source 53, thereby dynamically simulating the subtle optical changes brought about by the blood flow process in the human skin under complex physiological conditions. The system collects the light signal reflected after the light source 53 is absorbed by the bionic skin 51 and converts it into a physiological electrical signal, which makes the simulated physiological electrical signal closer to the human physiological state, improving the accuracy and reliability of the simulation. In addition, the signal generation component 54 in the system can flexibly adjust the driving electrical signal applied to the liquid crystal film 52 to generate diverse physiological electrical signals (i.e., PPG signals), which helps physiological electrical signals play a more important role in the product design, performance verification and debugging process in the health field.

[0091] In some embodiments, the signal generation component 54 includes:

[0092] The signal modulation module is used to modulate and generate the initial electrical signal;

[0093] An amplification module is used to amplify the initial electrical signal to generate the driving electrical signal.

[0094] In this embodiment of the disclosure, the signal generation component 54 for generating the driving electrical signal includes a signal modulation module. The signal modulation module is one of the core components of the signal generation component and is used to modulate and generate the initial electrical signal. For example, the signal modulation module can implement the signal modulation function through internal circuits or software algorithms so that the generated initial electrical signal meets the preset electrical signal waveform characteristic parameters.

[0095] In some embodiments, the signal modulation module includes:

[0096] A signal generator is used to generate the signal to be modulated.

[0097] An envelope generator is used to perform amplitude modulation on the signal to be modulated.

[0098] A frequency modulator, used to perform frequency modulation on the signal to be modulated;

[0099] A signal converter is used to convert the digital signal after amplitude and frequency modulation of the signal to be modulated into the initial electrical signal.

[0100] In this embodiment, the signal modulation module can adopt a separate sub-module design. The signal modulation module includes a signal generator, which is the starting point of the modulation process and is responsible for generating the original signal to be modulated. The signal generator can typically generate the signal through an internal oscillation circuit or digital signal processing technology. The signal to be modulated can be any periodically changing waveform such as a sine wave or a square wave, depending on the actual needs. This embodiment does not impose any restrictions on this.

[0101] In this embodiment, the signal modulation module includes an envelope generator, which receives the signal to be modulated from the signal generator and performs amplitude modulation on the signal. Amplitude modulation can be achieved by dynamically adjusting the amplitude envelope of the signal to be modulated, that is, the amplitude of the signal changes with time according to a certain rule. This change can be achieved by multiplying the signal to be modulated by a time-varying envelope function.

[0102] In this embodiment of the disclosure, the signal modulation module includes a frequency modulator, which further modulates the amplitude-modulated signal to achieve a wider range of control over the signal characteristics. Frequency modulation is achieved by changing the instantaneous frequency of the signal to be modulated, which is usually accomplished by mixing the signal to be modulated with a carrier signal (such as a high-frequency sine wave) in some form. The mixing method can be direct modulation (such as FM modulation) or indirect modulation (such as phase-locked loop modulation).

[0103] In this embodiment of the disclosure, the signal modulation module further includes a signal converter, which is the final stage of the modulation process and is responsible for converting the amplitude- and frequency-modulated digital signal into an initial electrical signal. Since digital signal processing is typically involved in the modulation process, the modulated digital signal needs to be converted into an analog electrical signal for use by subsequent circuits. The signal converter can typically employ a high-performance digital-to-analog converter (DAC) to perform the conversion from digital to analog electrical signals.

[0104] In other embodiments, an integrated solution can be adopted for the signal modulation module. For example, the signal modulation module can be a signal generator. The signal generator directly modulates and generates an initial electrical signal based on preset modulation information (such as parameters such as the frequency, amplitude and phase of the signal) and provides it to the liquid crystal film 52.

[0105] In this embodiment, the signal generation component 54 further includes an amplification module. This module receives the initial electrical signal output from the signal modulation module and amplifies it by adjusting the amplification factor and gain control to generate a driving electrical signal with sufficient driving capability. The amplification module may include a transistor amplifier, a driving circuit, and a feedback network. The transistor amplifier is the core component, responsible for amplifying the signal strength to the required level. The driving circuit safely and reliably sends the modulated signal into the transistor amplifier. The feedback network monitors the state of the output signal and adjusts the amplifier's operating state through a negative feedback mechanism to improve signal stability. In this embodiment, for example, the voltage required to drive the liquid crystal film in the bionic skin is 130V. However, the initial electrical signal generated by the signal modulation module is usually of low strength and cannot directly meet the driving requirements of the liquid crystal film. Therefore, an amplification module can be used to amplify the initial electrical signal before transmitting it to the liquid crystal film. To meet the operating requirements of the amplification module under high voltage and high current conditions, and to ensure the liquid crystal film can operate continuously and stably, a high-voltage source can also be provided to supply a relatively high voltage (e.g., 140V) to the system.

[0106] It is understood that the signal generation component 54 in this embodiment of the present disclosure, by integrating signal modulation and amplification functions, not only significantly improves the efficiency and accuracy of driving electrical signal generation, but also greatly enhances the precise control capability of the liquid crystal film 52 over the light absorption characteristics.

[0107] In some embodiments, the signal generation component 54 further includes:

[0108] A noise generation module is connected between the signal modulation module and the amplification module to generate a noise signal that interferes with the initial electrical signal.

[0109] In the field of signal processing, the quality of electrical signals directly affects the performance and reliability of a system. However, in practical applications, electrical signals are often subject to interference from various factors, such as the transmission medium, the internal or external electromagnetic environment of the equipment. This interference exists in the form of noise, which adversely affects the transmission and processing of electrical signals. To simulate signal interference in such a real-world environment, or to evaluate the system's resistance to noise during signal testing, noise signals can be flexibly introduced during the signal generation process.

[0110] In this embodiment, the signal generation component 54 further includes a noise generation module connected between the signal modulation module and the amplification module. Its main function is to generate noise signals that interfere with the initial electrical signal. For example, after the signal modulation module generates the initial electrical signal, the noise generation module can generate various types of noise signals, including but not limited to white noise, Gaussian noise, or interference signals of specific frequencies, through specific internal hardware circuit design (such as thermal noise sources, transistor noise sources, etc.) or software algorithms (such as using a random number generator combined with a filter). The generated noise signal is superimposed on the initial electrical signal output by the signal modulation module, thereby altering the characteristics of the initial electrical signal to a certain extent, causing the initial electrical signal transmitted to the amplification module to contain interference signal components.

[0111] It is understood that the embodiments of this disclosure introduce controllable noise signals during signal generation through a noise generation module, which can more realistically simulate the actual interference encountered by the signal during transmission and processing, and help evaluate and improve the system's adaptability and stability in complex environments.

[0112] This disclosure also provides a signal simulation method. Figure 12 This is a flowchart illustrating a signal simulation method according to an exemplary embodiment. Figure 12 As shown, the method mainly includes the following steps:

[0113] In step S121, a driving electrical signal is generated by modulation; wherein the driving electrical signal is used to drive the liquid crystal film 52 in the bionic skin 51 to simulate the absorption of light source 53 by blood;

[0114] In step S122, a physiological electrical signal is obtained after converting the light signal reflected by the bionic skin 51; wherein, the light signal reflected by the bionic skin 51 is obtained by reflecting light after simulated light absorption by the liquid crystal film 52;

[0115] In step S123, the accuracy of the signal simulation is determined based on the driving electrical signal and the physiological electrical signal; wherein, the accuracy of the signal simulation characterizes the fit between the physiological electrical signal and the driving electrical signal.

[0116] The signal simulation method in this embodiment can be applied to the electronic device corresponding to the signal generation component 54 in the signal simulation system of this embodiment.

[0117] In step S121, the electronic device can modulate and generate a driving electrical signal according to preset parameters such as waveform, frequency, and amplitude. The driving electrical signal is designed to drive the liquid crystal film 52 in the bionic skin 51, simulating the absorption characteristics of light source by blood in human skin. For a related introduction to the bionic skin 51 and the liquid crystal film 52, please refer to the description in the foregoing steps in the embodiments of this disclosure. Since the liquid crystal film 52 has the characteristic of being sensitive to electrical signals, when the driving electrical signal of the signal generation component 54 is applied to the liquid crystal film 52, the electric field effect of the driving electrical signal on the liquid crystal film 52 can cause the liquid crystal molecules L7 in the liquid crystal film 52 to rearrange, thereby changing the absorption characteristics of the light source 53. Specifically, when a higher voltage is applied to the liquid crystal film 52, the electric field generated in the liquid crystal layer will change the arrangement of the liquid crystal molecules L7, causing the liquid crystal molecules L7 to change from a disordered or tilted state to a more orderly and ordered arrangement. This arrangement usually leads to a reduction in the scattering or polarization effect of the liquid crystal layer on light, thereby allowing more light to pass directly through the liquid crystal layer, achieving the effect of improving light transmittance. When a low voltage is applied to the liquid crystal film 52, the liquid crystal molecules L7 may be in a disordered or tilted alignment. In this state, the scattering effect of the liquid crystal layer on light is enhanced because light encounters liquid crystal molecules L7 aligned in different directions when passing through the liquid crystal layer, resulting in ineffective light scattering and a low transmittance, i.e., light absorption. In other words, by generating driving electrical signals with different electrical parameters, the optical properties of the liquid crystal film 52 can be controlled to simulate light absorption under different physiological states.

[0118] In step S122, the light source illuminates the bionic skin 51. After the light is absorbed by the liquid crystal film 52, simulating the absorption of light by blood, the remaining light signal in the light source 53 is reflected back by the bionic skin. The signal processing component 55 captures these reflected light signals and converts them into physiological electrical signals, namely PPG signals. The electronic device receives the physiological electrical signals sent by the signal processing component 55. These physiological electrical signals should have a certain similarity to the real physiological signals representing human physiological characteristics in terms of waveform, frequency, amplitude, etc.

[0119] In step S123, the electronic device determines the accuracy of the signal simulation based on the driving electrical signal and the acquired physiological electrical signal. The accuracy of the signal simulation, which characterizes the fit between the physiological electrical signal and the driving electrical signal, actually refers to the degree of mutual matching between these two types of signals under specific conditions. A high degree of fit in signal simulation means that the driving electrical signal can accurately control the changes in the optical properties of the liquid crystal film in the bionic skin, thereby simulating light absorption characteristics similar to real physiological processes. The light signal reflected by the bionic skin can be accurately converted into a physiological electrical signal, and this signal is highly consistent with the ideal physiological electrical signal in theoretical predictions or experimental data. In other words, the higher the accuracy of the signal simulation, the better the performance in simulating PPG signals representing physiological characteristics. Therefore, the entire signal simulation method has good stability and reliability.

[0120] In some embodiments, the display module of the electronic device displays the waveforms of the physiological electrical signal and the driving electrical signal, and the user observes the waveforms on the display module to compare the waveforms of the physiological electrical signal and the driving electrical signal. Based on the observed waveform characteristics, the fit between the driving electrical signal and the physiological electrical signal is evaluated. For example, the evaluation results can be recorded by judging indicators such as waveform similarity, error range, and phase difference, including the level of fit, i.e., the accuracy of the signal simulation.

[0121] In other embodiments, determining the accuracy of the signal simulation based on the driving electrical signal and the physiological electrical signal includes:

[0122] Obtain statistical feature data of the waveform corresponding to the physiological electrical signal;

[0123] The accuracy of the signal simulation is determined based on the statistical feature data and the modulation information of the driving electrical signal.

[0124] In this embodiment of the disclosure, the electronic device can calculate and extract statistical feature data of the physiological electrical signal waveform based on the acquired physiological electrical signal data using statistical methods (such as mean, variance, skewness, kurtosis, etc.) or time-frequency analysis methods (such as Fourier transform, wavelet transform, etc.). The statistical feature data is key information reflecting the morphological characteristics, frequency distribution, energy distribution, etc. of the signal.

[0125] In this embodiment, the electronic device compares and analyzes the statistical characteristic data of physiological electrical signals with the modulation information of driving electrical signals. It calculates the difference between the statistical characteristic data and the modulation information of the driving electrical signals. For example, it calculates the average difference between the analog signal and the real signal by calculating the mean square error, or it calculates the correlation coefficient to measure the linear correlation between the two signal waveforms, or it calculates the signal-to-noise ratio to obtain the ratio of effective information to noise in the signal. Then, based on the difference between the two, it precisely and quantitatively evaluates the matching degree of the signal simulation. The modulation information of the driving electrical signal is the basis for modulating and generating the initial electrical signal, including the amplitude and frequency of the signal to be modulated.

[0126] It is understood that the embodiments of this disclosure dynamically adjust the absorption characteristics of the liquid crystal film 52 disposed inside the bionic skin 51 to the light source 53 by modulating the driving electrical signal, thereby dynamically simulating the subtle optical changes brought about by the blood flow process in human skin under complex physiological conditions. The light signal reflected after the light source is absorbed by the bionic skin 51 is collected and converted into a physiological electrical signal. The accuracy of the signal simulation is evaluated based on the compatibility between the physiological electrical signal and the driving electrical signal. This makes the simulated physiological electrical signal closer to the human physiological state, improving the accuracy and reliability of the simulation results. Furthermore, by flexibly adjusting the driving electrical signal applied to the liquid crystal film, a variety of physiological electrical signals can be generated, which helps physiological electrical signals play a more important role in the product design, performance verification and debugging process in the health field.

[0127] In some embodiments, the modulation generation of the driving electrical signal includes:

[0128] Modulation generates the initial electrical signal;

[0129] The initial electrical signal is amplified to generate the driving electrical signal.

[0130] In this embodiment of the disclosure, the initial electrical signal is generated through modulation, a process that can be accomplished by a signal modulation module. The signal modulation module can employ a separate submodule design or an integrated solution.

[0131] In some embodiments, the modulation generates the initial electrical signal, including:

[0132] Generate the signal to be modulated;

[0133] The signal to be modulated is subjected to amplitude modulation and frequency modulation;

[0134] The digital signal obtained by amplitude and frequency modulation of the signal to be modulated is converted into the initial electrical signal.

[0135] In this embodiment of the disclosure, the signal modulation module in the electronic device adopts a separate sub-module design. The signal modulation module is composed of a signal generator, an envelope generator, a frequency modulator, and a signal converter. The signal generator is used to generate the original signal to be modulated. The signal to be modulated can be a periodically changing waveform such as a sine wave or a square wave, which is determined based on actual needs.

[0136] In this embodiment of the disclosure, the envelope generator in the electronic device adjusts the amplitude envelope of the signal to be modulated to achieve amplitude modulation, and the frequency modulator changes the instantaneous frequency of the signal to be modulated to perform further frequency modulation in order to achieve a wider range of control over the signal characteristics.

[0137] In this embodiment of the disclosure, since digital signal processing is usually involved in the modulation process, it is necessary to convert the modulated digital signal into an analog electrical signal for use by subsequent circuits. Therefore, a signal converter is used to convert the digital signal after amplitude and frequency modulation into an initial electrical signal.

[0138] In other embodiments, the signal modulation module in the electronic device may also adopt an integrated solution. For example, the signal modulation module may be a signal generator. In this case, the system may directly use the signal generator in the electronic device to modulate and generate an initial electrical signal based on preset electrical signal characteristics (such as signal frequency, amplitude and phase parameters) and provide it to the liquid crystal film 52.

[0139] In this disclosure example, an amplification module in an electronic device is also used to receive the initial electrical signal from the signal modulation module, and the initial electrical signal is amplified by adjusting the amplification factor and gain control to generate a drive electrical signal with sufficient driving capability.

[0140] It is understood that the signal modulation and signal amplification process in this embodiment generates a driving electrical signal, which not only significantly improves the efficiency and accuracy of driving electrical signal generation, but also greatly enhances the ability of the liquid crystal film 52 to precisely control the light absorption characteristics.

[0141] In some embodiments, the method further includes:

[0142] Generate noise signals that interfere with the initial electrical signal;

[0143] The step of amplifying the initial electrical signal to generate the driving electrical signal includes:

[0144] The initial electrical signal is amplified and generated based on the noise signal interfering with it.

[0145] In this embodiment, the noise generation module is connected between the signal modulation module and the amplification module. The noise generation module in the electronic device generates a noise signal that acts on the initial electrical signal, interfering with the initial electrical signal. The noise signal is superimposed on the initial electrical signal from the signal modulation module, thereby changing the characteristics of the initial electrical signal to a certain extent, so that the initial electrical signal transmitted to the amplification module contains interference signal components.

[0146] It is understood that by introducing controllable noise signals during the signal generation process, the present invention can more realistically simulate the actual interference encountered by the initial electrical signal during transmission and processing, and help evaluate and improve the adaptability and stability of electronic devices in complex environments.

[0147] Figure 13 This is a flowchart illustrating a PPG signal simulation according to an exemplary embodiment. Figure 13 As shown, it includes the following steps:

[0148] S131, Input module.

[0149] In this embodiment of the disclosure, the electronic device obtains modulation information for generating the driving electrical signal through its input module.

[0150] S132, Signal modulation module.

[0151] In this embodiment of the present disclosure, the signal modulation module within the signal generation component 54 of the electronic device modulates and generates an initial electrical signal based on the acquired modulation information.

[0152] S133, High Voltage Generation Module.

[0153] In this embodiment of the disclosure, in order to meet the working requirements of the amplification module under high voltage and high current conditions, and to enable the liquid crystal film to work continuously and stably, the electronic device may be equipped with a high voltage source to provide a relatively high voltage.

[0154] S134, Amplification module.

[0155] In this embodiment of the disclosure, since the initial electrical signal generated by the signal modulation module is usually of low strength and cannot directly meet the driving requirements of the liquid crystal film, the electronic device can amplify the initial electrical signal by setting an amplification module in the signal generation component 54 before transmitting it to the liquid crystal film.

[0156] S135, liquid crystal blood vessels.

[0157] In this embodiment of the disclosure, the liquid crystal blood vessel refers to the liquid crystal film 52 disposed in the dermal layer of the bionic skin 51. The liquid crystal film 52 acts as a liquid crystal blood vessel. The driving electrical signal is applied to the liquid crystal film 52. The electronic device can adjust the absorption characteristics of the liquid crystal film 52 to the light source 53, which can simulate the changes in optical characteristics caused by the flow of blood in the arteries of human skin, thereby simulating the physiological electrical signals that conform to the physiological state of the human body.

[0158] S136, Display module.

[0159] In this embodiment of the disclosure, the electronic device displays simulated psychoelectrical signal data via a display module.

[0160] Figure 14 This is a schematic diagram illustrating a PPG signal simulation according to an exemplary embodiment. For example... Figure 14 As shown, in S141, PPG signal simulation begins; in S142, an initial electrical signal is generated using a signal generator. The signal generator, as an integrated solution for the signal modulation module, can directly modulate and generate the initial electrical signal based on preset electrical signal characteristics (such as signal frequency, amplitude, and phase parameters), and provide it to the liquid crystal film 52; in S143-S145, the signal modulation module adopts a separate sub-module design, consisting of a signal generator, an envelope generator, a frequency modulator, and a signal converter. In S143, the envelope generator adjusts the amplitude envelope of the signal to be modulated to achieve amplitude modulation; in S144, the frequency modulator changes the instantaneous frequency of the signal to be modulated for further frequency modulation to achieve broader control over signal characteristics. In S145, the signal converter converts the amplitude- and frequency-modulated digital signal into an initial electrical signal; in S146, the amplification module receives the initial electrical signal output by the signal modulation module and amplifies the initial electrical signal by adjusting the amplification factor and gain control to generate a driving electrical signal with sufficient driving capability; in S147, the liquid crystal blood vessel refers to the liquid crystal film 52 set in the dermis layer of the bionic skin. The liquid crystal film 52 acts as a liquid crystal blood vessel. The driving electrical signal is applied to the liquid crystal film 52, which can adjust the absorption characteristics of the liquid crystal film 52 to the light source, and can simulate the changes in optical characteristics caused by the flow of blood in the arteries of human skin, thereby simulating the physiological electrical signal that conforms to the physiological state of the human body; in S148, the electronic device outputs the simulated physiological electrical signal data.

[0161] Figure 15 This is a block diagram illustrating a signal simulation device according to an exemplary embodiment. Figure 15 As shown, the device mainly includes:

[0162] The first generation module 1501 is configured to modulate and generate a driving electrical signal; wherein the driving electrical signal is used to drive the liquid crystal film in the bionic skin to simulate the absorption of light source by blood;

[0163] The acquisition module 1502 is configured to acquire a physiological electrical signal after converting the light signal reflected by the bionic skin; wherein the light signal reflected by the bionic skin is obtained by reflecting light after simulated light absorption by the liquid crystal film;

[0164] The determining module 1503 is configured to determine the accuracy of the signal simulation based on the driving electrical signal and the physiological electrical signal; wherein the accuracy of the signal simulation characterizes the fit between the physiological electrical signal and the driving electrical signal.

[0165] In some embodiments, the first generation module 1501 is further configured to modulate and generate an initial electrical signal; and to amplify the initial electrical signal to generate the driving electrical signal.

[0166] In some embodiments, the first generation module 1501 is further configured to generate a signal to be modulated; perform amplitude modulation and frequency modulation on the signal to be modulated; and convert the digital signal after amplitude and frequency modulation of the signal to be modulated into the initial electrical signal.

[0167] In some embodiments, the apparatus further includes:

[0168] The second generation module is configured to generate a noise signal that interferes with the initial electrical signal;

[0169] The first generation module 1501 is further configured to amplify and generate the driving electrical signal based on the noise signal interfering with the initial electrical signal.

[0170] In some embodiments, the determining module 1503 is further configured to acquire statistical feature data of the waveform corresponding to the physiological electrical signal; and determine the accuracy of the signal simulation based on the statistical feature data and the modulation information of the driving electrical signal.

[0171] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0172] Figure 16 This is a structural block diagram of an electronic device 1600 according to an exemplary embodiment. The electronic device is the electronic device corresponding to the signal generation component within the signal analog system of this disclosure embodiment.

[0173] Reference Figure 16The electronic device 1600 may include one or more of the following components: processing component 1602, memory 1604, power supply component 1606, multimedia component 1608, audio component 1610, input / output (I / O) interface 1612, sensor component 1614, and communication component 1616.

[0174] Processing component 1602 typically controls the overall operation of electronic device 1600, such as operations associated with at least one of display, telephone call, data communication, camera operation, and recording operation. Processing component 1602 may include one or more processors 1620 to execute instructions to perform all or part of the steps of the methods described above. Furthermore, processing component 1602 may include one or more modules to facilitate interaction between processing component 1602 and other components. For example, processing component 1602 may include a multimedia module to facilitate interaction between multimedia component 1608 and processing component 1602.

[0175] Memory 1604 is configured to store various types of data to support operation on electronic device 1600. Examples of such data include at least one of the following: instructions for any application or method operating on electronic device 1600, contact data, phonebook data, messages, pictures, and videos. Memory 1604 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0176] Power supply component 1606 provides power to various components of electronic device 1600. Power supply component 1606 may include at least one of the following: a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to electronic device 1600.

[0177] Multimedia component 1608 includes a screen that provides an output interface between electronic device 1600 and a user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a Touch Panel, the screen may be implemented as a touchscreen to receive input signals from the user. The Touch Panel includes one or more touch sensors to sense touches, swipes, and gestures on the Touch Panel. The touch sensors may sense not only the boundaries of touch or swipe actions but also the duration and pressure associated with the touch or swipe operation. In some embodiments, multimedia component 1608 includes a front-facing camera and / or a rear-facing camera. When electronic device 1600 is in an operating mode, such as a shooting mode or a video mode, the front-facing camera and / or rear-facing camera may receive external multimedia data. Each front-facing camera and rear-facing camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0178] Audio component 1610 is configured to output and / or input audio signals. For example, audio component 1610 includes a microphone (MIC) configured to receive external audio signals when electronic device 1600 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 1604 or transmitted via communication component 1616. In some embodiments, audio component 1610 also includes a speaker for outputting audio signals.

[0179] I / O interface 1612 provides an interface between processing component 1602 and peripheral interface modules, such as keyboards, click wheels, and buttons. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0180] Sensor assembly 1614 includes one or more sensors for providing state assessment of various aspects of electronic device 1600. For example, sensor assembly 1614 may detect the on / off state of electronic device 1600, the relative positioning of components such as the display and keypad of electronic device 1600, changes in position of electronic device 1600 or one of its components, the presence or absence of user contact with electronic device 1600, orientation or acceleration / deceleration of electronic device 1600, and temperature changes of electronic device 1600. Sensor assembly 1614 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 1614 may also include an optical sensor, such as a complementary metal-oxide-semiconductor (CMOS) or charge-coupled device (CCD) image sensor, for use in imaging applications. In some embodiments, sensor assembly 1614 may also include, but is not limited to, at least one of the following: an accelerometer, a gyroscope, a magnetometer, a pressure sensor, and a temperature sensor.

[0181] Communication component 1616 is configured to facilitate wired or wireless communication between electronic device 1600 and other devices. Electronic device 1600 can access wireless networks based on communication standards, such as Wi-Fi, 4G, 5G, or combinations thereof. In one exemplary embodiment, communication component 1616 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 1616 also includes a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, Infrared Data Association (IrDA) technology, Ultra Wide Band (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0182] In an exemplary embodiment, the electronic device 1600 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.

[0183] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 1604 including executable instructions or a computer program, which can be executed by a processor 1620 of an electronic device 1600 to perform the above-described method. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), a compact disc read-only memory (CD-ROM), magnetic tape, floppy disk, and optical data storage device, etc.

[0184] A non-transitory computer-readable storage medium, wherein instructions in the storage medium, when executed by a processor of an electronic device, enable the electronic device to perform any of the signal simulation methods described in the embodiments of this disclosure.

[0185] This disclosure provides a computer program product comprising a computer program or executable instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer program or executable instructions from the computer-readable storage medium and executes the computer program or executable instructions, causing the computer device to perform any of the signal simulation methods described in this disclosure.

[0186] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0187] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A signal simulation system, characterized in that, The system includes: bionic skin, a liquid crystal film, a light source, a signal generation component, and a signal processing component; wherein, the liquid crystal film is disposed inside the bionic skin, the signal generation component is connected to the liquid crystal film, and the light source is used to irradiate the bionic skin; The signal generation component is used to generate a driving electrical signal and drive the liquid crystal film to simulate the absorption of the light source by blood through the driving electrical signal; The signal processing component is used to collect the light signal reflected by the bionic skin after it is absorbed by the liquid crystal film, and to convert the light signal into a physiological electrical signal.

2. The system according to claim 1, characterized in that, The bionic skin is composed of multiple elastic membranes stacked together, which are used to simulate the various tissue layers of the skin. The liquid crystal membrane is disposed between the elastic membranes corresponding to the dermal layer.

3. The system according to claim 1, characterized in that, The signal generation component includes: The signal modulation module is used to modulate and generate the initial electrical signal; An amplification module is used to amplify the initial electrical signal to generate the driving electrical signal.

4. The system according to claim 3, characterized in that, The signal modulation module includes: A signal generator is used to generate the signal to be modulated. An envelope generator is used to perform amplitude modulation on the signal to be modulated. A frequency modulator, used to perform frequency modulation on the signal to be modulated; A signal converter is used to convert the digital signal after amplitude and frequency modulation of the signal to be modulated into the initial electrical signal.

5. The system according to claim 3, characterized in that, The signal generation component further includes: A noise generation module is connected between the signal modulation module and the amplification module to generate a noise signal that interferes with the initial electrical signal.

6. A signal simulation method, characterized in that, The method includes: A driving electrical signal is generated by modulation; wherein the driving electrical signal is used to drive the liquid crystal film in the bionic skin to simulate the absorption of light source by blood; The physiological electrical signal is obtained by converting the light signal reflected by the bionic skin; wherein the light signal reflected by the bionic skin is obtained by reflecting light after simulated light absorption by the liquid crystal film; Based on the driving electrical signal and the physiological electrical signal, the accuracy of the signal simulation is determined; wherein, the accuracy of the signal simulation characterizes the fit between the physiological electrical signal and the driving electrical signal.

7. The method according to claim 6, characterized in that, The modulation generates the driving electrical signal, including: Modulation generates the initial electrical signal; The initial electrical signal is amplified to generate the driving electrical signal.

8. The method according to claim 7, characterized in that, The modulation generates the initial electrical signal, including: Generate the signal to be modulated; The signal to be modulated is subjected to amplitude modulation and frequency modulation; The digital signal obtained by amplitude and frequency modulation of the signal to be modulated is converted into the initial electrical signal.

9. The method according to claim 7, characterized in that, The method further includes: Generate noise signals that interfere with the initial electrical signal; The step of amplifying the initial electrical signal to generate the driving electrical signal includes: The initial electrical signal is amplified and generated based on the noise signal interfering with it.

10. The method according to claim 6, characterized in that, Determining the accuracy of the signal simulation based on the driving electrical signal and the physiological electrical signal includes: Obtain statistical feature data of the waveform corresponding to the physiological electrical signal; The accuracy of the signal simulation is determined based on the statistical feature data and the modulation information of the driving electrical signal.

11. A signal simulation device, characterized in that, The device includes: The generation module is configured to modulate and generate a driving electrical signal; wherein the driving electrical signal is used to drive the liquid crystal film in the bionic skin to simulate the absorption of light source by blood; The acquisition module is configured to acquire a physiological electrical signal after converting the light signal reflected by the bionic skin; wherein the light signal reflected by the bionic skin is obtained by reflecting light after simulated light absorption by the liquid crystal film; The determination module is configured to determine the accuracy of the signal simulation based on the driving electrical signal and the physiological electrical signal; wherein the accuracy of the signal simulation characterizes the fit between the physiological electrical signal and the driving electrical signal.

12. An electronic device, characterized in that, include: processor; Memory used to store computer programs or instructions; The processor executes the computer program or instructions to implement the steps of the method according to any one of claims 6 to 10.

13. A non-transitory computer-readable storage medium storing a computer program or instructions, characterized in that, When the computer program or instructions in the storage medium are executed by a processor, the steps of the method according to any one of claims 6 to 10 are implemented.

14. A computer program product, comprising a computer program or instructions, characterized in that, When the computer program or instructions are executed by a processor, they implement the steps of the method according to any one of claims 6 to 10.

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