CN113397558A

CN113397558A - Human physiological signal acquisition circuit and terminal equipment

Info

Publication number: CN113397558A
Application number: CN202110668647.1A
Authority: CN
Inventors: 胡斌; 赵庆林; 秦石明; 崔运植; 杨得武
Original assignee: Lanzhou University
Current assignee: Lanzhou University
Priority date: 2021-06-16
Filing date: 2021-06-16
Publication date: 2021-09-17

Abstract

The application provides a human body physiological signal acquisition circuit and terminal equipment, wherein a human body physiological signal is acquired through a signal acquisition circuit to output a first analog signal; the analog-to-digital conversion circuit converts the first analog signal into a digital signal and transmits the digital signal from a line; the digital-to-analog conversion circuit receives a digital signal from a line and converts the digital signal into a second analog signal; the control circuit obtains the human physiological parameter information according to the second analog signal, so that the acquired human physiological signal is transmitted in a digital signal form, the noise influence in the transmission process is reduced, and the accuracy of information acquisition is improved.

Description

Human physiological signal acquisition circuit and terminal equipment

Technical Field

The application belongs to the technical field of electronics, and particularly relates to a human physiological signal acquisition circuit and a terminal device.

Background

With the continuous development of modern medicine, the human physiological signal acquisition circuit is widely applied to various departments of a hospital as a basic configuration device for clinical medical use in the hospital. The human body physiological signal acquisition circuit can utilize various acquired physiological information to help clinicians to effectively analyze the state of illness of a patient and take appropriate measures to obtain the optimal treatment effect of the patient, so the application of the human body physiological signal acquisition circuit is more and more extensive.

However, the sensors in the existing human physiological signal acquisition circuit are generally analog signals when acquiring signals, and noise such as power frequency and the like is introduced in the transmission process, so that the accuracy of information acquisition is influenced.

Disclosure of Invention

The purpose of this application is providing a human physiology signal acquisition circuit and terminal equipment, aims at solving traditional human physiology signal acquisition circuit and has the analog signal of gathering and can introduce the problem of noise in transmission process.

In order to achieve the above object, in a first aspect, an embodiment of the present application provides a human physiological signal acquisition circuit, including:

the signal acquisition circuit is configured to acquire a human physiological signal to output a first analog signal;

the analog-to-digital conversion circuit is connected with the signal acquisition circuit and is configured to convert the first analog signal into a digital signal and send the digital signal from a line;

the digital-to-analog conversion circuit is connected with the analog-to-digital conversion circuit and is configured to receive the digital signal from the line and convert the digital signal into a second analog signal;

and the control circuit is connected with the digital-to-analog conversion circuit and is configured to obtain the human physiological parameter information according to the second analog signal.

In one possible embodiment of the first aspect, the human physiological signal includes an electroencephalogram signal, an electrocardiograph signal, an electromyogram signal, a temperature signal, a respiration signal, and a blood oxygen signal; the first analog signal comprises a first electroencephalogram analog signal, a first electrocardiogram analog signal, a first electromyogram analog signal, a first temperature analog signal, a first respiration analog signal and a first blood oxygen analog signal; the signal acquisition circuit includes:

the electroencephalogram sensor is connected with the analog-to-digital conversion circuit and is configured to collect the electroencephalogram signal of a human body so as to output the first electroencephalogram analog signal;

the electrocardio sensor is connected with the analog-to-digital conversion circuit and is configured to collect the electrocardiosignals of the human body so as to output the first electrocardio analog signals;

the electromyographic sensor is connected with the analog-to-digital conversion circuit and is configured to collect the electromyographic signals of the human body so as to output the first electromyographic analog signals;

the temperature sensor is connected with the analog-to-digital conversion circuit and configured to collect the temperature signal of the human body so as to output the first temperature analog signal;

the breathing sensor is connected with the analog-to-digital conversion circuit and is configured to collect the breathing signal of a human body so as to output the first breathing analog signal;

and the blood oxygen sensor is connected with the analog-to-digital conversion circuit and is configured to collect the blood oxygen signal of the human body so as to output the first blood oxygen analog signal.

In another possible implementation manner of the first aspect, the human physiological signal acquisition circuit further includes:

and the aviation plug interface circuit is detachably connected with the analog-to-digital conversion circuit and the digital-to-analog conversion circuit and is configured to forward the digital signal.

and the isolation circuit is connected with the digital-to-analog conversion circuit and the control circuit and is configured to filter interference signals in the second analog signals.

In another possible embodiment of the first aspect, the digital signal includes a brain electrical digital signal, an electrocardiogram digital signal, an myoelectrical digital signal, a temperature digital signal, a respiration digital signal, and a blood oxygen digital signal; the analog-to-digital conversion circuit includes:

the electroencephalogram signal analog-to-digital conversion circuit is connected with the electroencephalogram sensor and the digital-to-analog conversion circuit and is configured to convert the first electroencephalogram analog signal into the electroencephalogram digital signal;

the electrocardiosignal analog-to-digital conversion circuit is connected with the electrocardio sensor and the digital-to-analog conversion circuit and is configured to convert the first electrocardio analog signal into the electrocardio digital signal;

an electromyographic signal analog-to-digital conversion circuit which is connected with the electromyographic sensor and the digital-to-analog conversion circuit and is configured to convert the first electromyographic analog signal into the electromyographic digital signal;

the temperature signal analog-to-digital conversion circuit is connected with the temperature sensor and the digital-to-analog conversion circuit and is configured to convert the first temperature analog signal into the temperature digital signal;

a respiration signal analog-to-digital conversion circuit connected with the respiration sensor and the digital-to-analog conversion circuit and configured to convert the first respiration analog signal into the respiration digital signal;

and the blood oxygen signal analog-to-digital conversion circuit is connected with the blood oxygen sensor and the digital-to-analog conversion circuit and is configured to convert the first blood oxygen analog signal into a blood oxygen digital signal.

In another possible embodiment of the first aspect, the second analog signal includes a second electroencephalogram analog signal, a second electrocardiogram analog signal, a second electromyography analog signal, a second temperature analog signal, a second respiration analog signal, and a second blood oxygen analog signal; the digital-to-analog conversion circuit includes:

the electroencephalogram signal digital-to-analog conversion circuit is connected with the electroencephalogram signal analog-to-digital conversion circuit and the control circuit and is configured to convert the electroencephalogram digital signal into the second electroencephalogram analog signal;

the electrocardiosignal digital-to-analog conversion circuit is connected with the electrocardiosignal analog-to-digital conversion circuit and the control circuit and is configured to convert the electrocardio digital signal into the second electrocardio analog signal;

the electromyographic signal digital-to-analog conversion circuit is connected with the electromyographic signal analog-to-digital conversion circuit and the control circuit and is configured to convert the electromyographic digital signal into the second electromyographic analog signal;

the temperature signal digital-to-analog conversion circuit is connected with the temperature signal analog-to-digital conversion circuit and the control circuit and is configured to convert the temperature digital signal into the second temperature analog signal;

the respiration signal digital-to-analog conversion circuit is connected with the respiration signal analog-to-digital conversion circuit and the control circuit and is configured to convert the respiration digital signal into the second respiration analog signal;

and the blood oxygen signal digital-to-analog conversion circuit is connected with the blood oxygen signal analog-to-digital conversion circuit and the control circuit and is configured to convert the blood oxygen digital signal into the second blood oxygen analog signal.

In another possible implementation of the first aspect, the isolation circuit includes:

the electroencephalogram signal trap is connected with the electroencephalogram signal digital-to-analog conversion circuit and the control circuit and is configured to trap the second electroencephalogram analog signal;

the electrocardiosignal wave trap is connected with the electrocardiosignal digital-to-analog conversion circuit and the control circuit and is configured to trap the second electrocardio analog signal;

the electromyographic signal wave trap is connected with the electromyographic signal digital-to-analog conversion circuit and the control circuit and is configured to trap the second electromyographic analog signal;

the temperature signal filter is connected with the temperature signal digital-to-analog conversion circuit and the control circuit and is configured to filter the second temperature analog signal;

the breathing signal filter is connected with the breathing signal digital-to-analog conversion circuit and the control circuit and is configured to filter the second breathing analog signal;

and the blood oxygen signal filter is connected with the blood oxygen signal digital-to-analog conversion circuit and the control circuit and is configured to filter the second blood oxygen analog signal.

In another possible implementation manner of the first aspect, each of the electroencephalogram signal trap, the electrocardiograph signal trap, and the electromyogram signal trap includes a trap component, and the trap component includes a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first operational amplifier, and a second operational amplifier;

the first end of the first capacitor and the first end of the first resistor are commonly connected to the second electroencephalogram analog signal input end of the notch component, the second electrocardiogram analog signal input end of the notch component or the second electromyogram analog signal input end of the notch component, the second end of the first capacitor and the first end of the second capacitor are commonly connected to the first end of the third resistor, the second end of the first resistor and the first end of the second resistor are commonly connected to the first end of the third capacitor, the second end of the second capacitor and the second end of the second resistor are commonly connected to the positive input end of the first operational amplifier, the second end of the third resistor, the second end of the third capacitor and the output end of the second operational amplifier are commonly connected to the negative input end of the second operational amplifier, the output end of the first operational amplifier, the output end of the second operational amplifier, the first end of the second capacitor and the first end of the second capacitor are commonly connected to the negative input end of, The negative input end of the first operational amplifier and the first end of the fourth resistor are connected to the second electroencephalogram analog signal output end of the notch component, the second electrocardiogram analog signal output end of the notch component or the second electromyogram analog signal output end of the notch component, the positive input end of the second operational amplifier and the second end of the fourth resistor are connected to the first end of the fifth resistor, and the second end of the fifth resistor is connected to the power ground.

In another possible implementation manner of the first aspect, the temperature signal filter, the respiration signal filter and the blood oxygen signal filter each include a filtering component, and the filtering component includes a load resistor, a first electrolytic capacitor and a second electrolytic capacitor;

the first end of load resistance and the first end of first electrolytic capacitor are connected to common the second temperature analog signal input of filtering component, the second breathing analog signal input of filtering component or the second blood oxygen analog signal input of filtering component, the second end of load resistance and the first end of second electrolytic capacitor are connected to common the second temperature analog signal output of filtering component, the second breathing analog signal output of filtering component or the second blood oxygen analog signal output of filtering component, the second end of first electrolytic capacitor and the second end of second electrolytic capacitor are connected to power ground jointly.

In another possible implementation of the first aspect, the brain electrical sensor comprises:

the electroencephalogram interface is configured to forward electroencephalogram signals of a human body;

the first filtering circuit is connected with the electroencephalogram interface and is configured to filter the electroencephalogram signal according to an electroencephalogram negative feedback signal;

the first operational amplifier follower is connected with the first filter circuit and configured to follow and output the filtered electroencephalogram signal;

the first instrument operational amplification circuit is connected with the first operational amplifier follower and is configured to amplify the electroencephalogram signals which are output by following to generate first electroencephalogram analog signals;

and the first common-mode feedback suppression circuit is connected with the first instrument operational amplification circuit and the first filter circuit and is configured to output the electroencephalogram negative feedback signal according to the first electroencephalogram analog signal.

In another possible implementation of the first aspect, the electrocardiograph sensor includes:

the electrocardio interface is configured to transmit electrocardiosignals of a human body;

the lead filtering circuit is connected with the electrocardio interface and is configured to filter the electrocardio signals according to electrocardio negative feedback signals;

the lead operational amplifier follower is connected with the lead filtering circuit and is configured to follow and output the filtered electrocardiosignals;

the second instrument operational amplification circuit is connected with the lead operational amplifier follower and is configured to amplify the electrocardiosignals which are output by following so as to output first electrocardio analog signals;

and the second common-mode feedback suppression circuit is connected with the second instrument operational amplification circuit and the lead filter circuit and is configured to output the electrocardio negative feedback signal according to the first electrocardio analog signal.

In another possible embodiment of the first aspect, the electromyography sensor includes:

the electromyographic interface is configured to forward electromyographic signals of a human body;

the shunt voltage reference circuit is connected with the myoelectricity interface and is configured to boost the myoelectricity signal according to a myoelectricity negative feedback signal;

the filtering and amplifying circuit is connected with the shunt voltage reference circuit and is configured to filter and amplify the boosted electromyographic signals to output first electromyographic analog signals;

and the third common-mode feedback suppression circuit is connected with the filtering amplification circuit and the shunt voltage reference circuit and is configured to generate the electromyographic negative feedback signal according to the first electromyographic analog signal.

In another possible embodiment of the first aspect, the temperature sensor includes:

the body temperature interface is configured to transmit a temperature signal of a human body;

the first-stage filter circuit is connected with the body temperature interface and is configured to filter the temperature signal;

the second operational amplifier follower is connected with the first-stage filter circuit and is configured to follow and output the temperature signal filtered by the first-stage filter circuit;

the second-stage filter circuit is connected with the second operational amplifier follower and is configured to filter the temperature signal which is output by following;

the signal processing circuit is connected with the second-stage filter circuit and is configured to perform current-voltage conversion processing on the temperature signal filtered by the second-stage filter circuit to obtain an initial temperature analog signal;

an error calibration circuit, coupled to the signal processing circuit, configured to perform differential input calibration on the initial temperature analog signal to generate a first temperature analog signal.

and the communication circuit is connected with the control circuit and is configured to send the human physiological parameter information to an upper computer.

In a second aspect, an embodiment of the present application provides a terminal device, including a human physiological signal acquisition circuit; and

and the upper computer is connected with the human physiological signal acquisition circuit and is configured to display the human physiological parameter information.

Compared with the prior art, the embodiment of the application has the advantages that: according to the human physiological signal acquisition circuit, the first analog signal of the human physiological signal is converted into the digital signal through the analog-to-digital conversion circuit and transmitted through the line, so that the acquired human physiological signal is transmitted in a digital signal form, the noise influence in the transmission process is reduced, and the accuracy of information acquisition is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a human physiological signal acquisition circuit provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a signal acquisition circuit of a human physiological signal acquisition circuit according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of an aviation plug interface circuit and an isolation circuit of a human physiological signal acquisition circuit provided in an embodiment of the present application;

fig. 4 is an exemplary circuit schematic diagram of a wave trap of a human physiological signal acquisition circuit provided in an embodiment of the present application;

FIG. 5 is an exemplary circuit schematic diagram of a filter of a human physiological signal acquisition circuit according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of an electroencephalogram sensor of a human physiological signal acquisition circuit provided in an embodiment of the present application;

FIG. 7 is a schematic structural diagram of an electrocardiograph sensor of a human physiological signal acquisition circuit according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of an electromyographic sensor of a human physiological signal acquisition circuit according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a temperature sensor of a human physiological signal acquisition circuit according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a respiration sensor of a human physiological signal acquisition circuit according to an embodiment of the present application;

FIG. 11 is a schematic structural diagram of a blood oxygen sensor of a human physiological signal acquisition circuit according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a terminal device of a human physiological signal acquisition circuit provided in an embodiment of the present application;

FIG. 13(a) is a waveform diagram of an electroencephalogram signal acquired by a conventional electrode;

fig. 13(b) is a waveform diagram of an electroencephalogram signal acquired by the electroencephalogram sensor provided in the embodiment of the present application;

FIG. 14(a) is a waveform diagram of an electrocardiographic signal acquired by a conventional electrode;

FIG. 14(b) is a waveform diagram of an ECG signal collected by an ECG sensor according to an embodiment of the present application;

FIG. 15(a) is a waveform diagram of a respiratory signal acquired by a conventional electrode;

fig. 15(b) is a waveform diagram of a respiration signal acquired by a respiration sensor provided in an embodiment of the present application;

FIG. 16(a) is a waveform diagram of an electromyographic signal collected by a conventional electrode;

fig. 16(b) is a waveform diagram of an electromyographic signal collected by an electromyographic sensor according to an embodiment of the present application; (ii) a

Fig. 17 is a plurality of human physiological signals of a mild depression patient acquired by the human physiological signal acquisition circuit according to the embodiment of the present application.

Description of reference numerals:

100-a signal acquisition circuit, 200-an analog-to-digital conversion circuit, 201-an aviation plug interface circuit, 300-a digital-to-analog conversion circuit, 301-an isolation circuit, 400-a control circuit, 500-a communication circuit and 600-an upper computer.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

At present, signal transmission between a plurality of sensors in the traditional human physiological signal acquisition circuit and the terminal equipment mostly adopts analog signal's mode to transmit, can introduce noise such as power frequency in transmission process, and transmission efficiency is low, influences information acquisition's accuracy simultaneously.

Therefore, the application provides a human physiological signal acquisition circuit, which adopts a digital signal transmission mode to realize signal transmission between a plurality of sensors in the human physiological signal acquisition circuit and terminal equipment, reduces noise influence in the transmission process and improves the accuracy of information acquisition.

The following describes, by way of example, a human physiological signal acquisition circuit provided in the present application, with reference to the accompanying drawings:

fig. 1 is a schematic structural diagram of a human physiological signal acquisition circuit provided in an embodiment of the present application, and as shown in fig. 1, for convenience of description, only parts related to the embodiment are shown, and detailed descriptions are as follows: the method can comprise the following steps: a signal acquisition circuit 100 configured to acquire a human physiological signal to output a first analog signal; an analog-to-digital conversion circuit 200 connected to the signal acquisition circuit 100 and configured to convert the first analog signal into a digital signal and transmit the digital signal from a line; a digital-to-analog conversion circuit 300 connected to the analog-to-digital conversion circuit 200, configured to receive the digital signal from the line and convert the digital signal into a second analog signal; and the control circuit 400 is connected with the digital-to-analog conversion circuit 300 and configured to obtain the human physiological parameter information according to the second analog signal.

In the embodiment of the application, after the plurality of sensors are worn on the corresponding parts of the human body, the signal acquisition circuit 100 acquires physiological signals (such as electroencephalogram signals, electrocardio signals, myoelectricity signals, temperature signals, respiratory signals, blood oxygen signals and the like) of the human body and outputs first analog signals to the analog-to-digital conversion circuit 200, the analog-to-digital conversion circuit 200 converts the first analog signals into digital signals capable of reducing noise influence in the transmission process and sends the digital signals to the digital-to-analog conversion circuit 300 from a line, the digital signals are received from the line through the digital-to-analog conversion circuit 300 and are converted into second analog signals to be transmitted to the control circuit 400, and the control circuit 400 acquires physiological parameter information of the human body according to the second analog signals so as to enable a doctor to obtain a treatment scheme.

Fig. 2 is a schematic structural diagram of a signal acquisition circuit of a human physiological signal acquisition circuit provided in an embodiment of the present application, and as shown in fig. 2, the human physiological signal exemplarily includes an electroencephalogram signal, an electrocardiograph signal, an electromyography signal, a temperature signal, a respiration signal, and a blood oxygen signal; the first analog signal comprises a first electroencephalogram analog signal, a first electrocardiogram analog signal, a first electromyogram analog signal, a first temperature analog signal, a first respiration analog signal and a first blood oxygen analog signal; the signal acquisition circuit 100 may include an electroencephalogram sensor, connected to the analog-to-digital conversion circuit 200, and configured to acquire an electroencephalogram signal of a human body to output a first electroencephalogram analog signal; the electrocardio sensor is connected with the analog-to-digital conversion circuit 200 and is configured to collect electrocardiosignals of a human body so as to output first electrocardio analog signals; the electromyographic sensor is connected with the analog-to-digital conversion circuit 200 and is configured to collect an electromyographic signal of a human body to output a first electromyographic analog signal; the temperature sensor is connected with the analog-to-digital conversion circuit 200 and configured to collect a temperature signal of a human body to output a first temperature analog signal; the breathing sensor is connected with the analog-to-digital conversion circuit 200 and is configured to collect breathing signals of a human body to output first breathing analog signals; the blood oxygen sensor is connected to the analog-to-digital conversion circuit 200, and configured to collect blood oxygen signals of a human body to output a first blood oxygen analog signal.

In this embodiment, the first electroencephalogram analog signal acquired by the electroencephalogram sensor, the first electrocardiogram analog signal acquired by the electrocardiogram sensor, the first myoelectricity analog signal acquired by the myoelectricity sensor, the first temperature analog signal acquired by the temperature sensor, the first respiration analog signal acquired by the respiration sensor, and the first blood oxygen analog signal acquired by the blood oxygen sensor are all converted into digital signals by the analog-to-digital conversion circuit 200 and then transmitted to the digital-to-analog conversion circuit 300 through the circuit, so that the acquired signals of the plurality of sensors are prevented from being interfered by noise in the transmission process.

Fig. 3 is a schematic structural diagram of an aviation plug interface circuit and an isolation circuit of a human physiological signal acquisition circuit provided in an embodiment of the present application, and as shown in fig. 3, an exemplary human physiological signal acquisition circuit further includes: the aviation plug interface circuit 201 is detachably connected with the analog-to-digital conversion circuit 200 and the digital-to-analog conversion circuit 300 and configured to forward digital signals.

In this embodiment, the analog-to-digital conversion circuit 200 converts the first analog signal of the human physiological signal into a digital signal and sends the digital signal to the input data line of the aviation plug interface circuit 201, and the output end of the aviation plug interface circuit 201 transmits the digital signal to the digital-to-analog conversion circuit 300, so that the transmission process of the digital signal in the data line is completed, the digital signal is transmitted in a form of the digital signal, the noise influence in the transmission process is reduced, and the accuracy of information acquisition is improved. Meanwhile, the analog-to-digital conversion circuit 200 and the analog-to-digital conversion circuit 300 can be detached and separated, and can be connected well when signals need to be collected, and compared with a traditional medical system collection device, the collection device is smaller and more portable, and applicable scenes are wider.

Exemplarily, the human physiological signal acquisition circuit further comprises: the isolation circuit 301 is connected to the digital-to-analog conversion circuit 300 and the control circuit 400, and configured to filter an interference signal in the second analog signal.

In this embodiment, the digital signal is converted into a second analog signal by the digital-to-analog conversion circuit 300 and sent to the isolation circuit 301, so that the terminal device can perform subsequent processing on the second analog signal; the isolation circuit 301 filters the interference signal in the second analog signal, so that the problems of noise and signal crosstalk in the process of acquiring the physiological signal by the traditional human physiological signal acquisition circuit are effectively avoided, and the quality of the acquired signal is ensured.

Illustratively, the digital signals include electroencephalogram digital signals, electrocardio digital signals, myoelectricity digital signals, temperature digital signals, respiration digital signals, and blood oxygen digital signals; the analog-to-digital conversion circuit includes: the electroencephalogram signal analog-to-digital conversion circuit is connected with the electroencephalogram sensor and the digital-to-analog conversion circuit 300 and is configured to convert the first electroencephalogram analog signal into an electroencephalogram digital signal; the electrocardiosignal analog-to-digital conversion circuit is connected with the electrocardio sensor and the digital-to-analog conversion circuit 300 and is configured to convert the first electrocardio analog signal into an electrocardio digital signal; an electromyographic signal analog-to-digital conversion circuit connected to the electromyographic sensor and the digital-to-analog conversion circuit 300, and configured to convert the first electromyographic analog signal into an electromyographic digital signal; the temperature signal analog-to-digital conversion circuit is connected with the temperature sensor and the digital-to-analog conversion circuit 300 and is configured to convert the first temperature analog signal into a temperature digital signal; a respiration signal analog-to-digital conversion circuit connected to the respiration sensor and the digital-to-analog conversion circuit 300 and configured to convert the first respiration analog signal into a respiration digital signal; the blood oxygen signal analog-to-digital conversion circuit is connected to the blood oxygen sensor and the digital-to-analog conversion circuit 300, and configured to convert the first blood oxygen analog signal into a blood oxygen digital signal.

In this embodiment, a plurality of sub-circuits of the analog-to-digital conversion circuit are used to perform analog-to-digital conversion on the first electroencephalogram analog signal, the first electrocardiogram analog signal, the first myoelectricity analog signal, the first temperature analog signal, the first respiration analog signal, and the first blood oxygen analog signal.

Illustratively, the second analog signal includes a second electroencephalogram analog signal, a second electrocardiograph analog signal, a second electromyography analog signal, a second temperature analog signal, a second respiration analog signal, and a second blood oxygen analog signal; the digital-to-analog conversion circuit includes: the electroencephalogram signal digital-to-analog conversion circuit is connected with the electroencephalogram signal analog-to-digital conversion circuit and the control circuit 400 and is configured to convert the electroencephalogram digital signal into a second electroencephalogram analog signal; the electrocardiosignal digital-to-analog conversion circuit is connected with the electrocardiosignal analog-to-digital conversion circuit and the control circuit 400 and is configured to convert the electrocardio digital signal into a second electrocardio analog signal; an electromyographic signal digital-to-analog conversion circuit connected to the electromyographic signal analog-to-digital conversion circuit and the control circuit 400, and configured to convert the electromyographic digital signal into a second electromyographic analog signal; a temperature signal digital-to-analog conversion circuit connected to the temperature signal analog-to-digital conversion circuit and control circuit 400 and configured to convert the temperature digital signal into a second temperature analog signal; a respiratory signal digital-to-analog conversion circuit connected to the respiratory signal analog-to-digital conversion circuit and the control circuit 400 and configured to convert the respiratory digital signal into a second respiratory analog signal; the blood oxygen signal digital-to-analog conversion circuit is connected to the blood oxygen signal analog-to-digital conversion circuit and the control circuit 400, and configured to convert the blood oxygen digital signal into a second blood oxygen analog signal.

In this embodiment, the digital-to-analog conversion of the electroencephalogram digital signal, the electrocardiograph digital signal, the myoelectricity digital signal, the temperature digital signal, the respiration digital signal, and the blood oxygen digital signal is completed through a plurality of sub-circuits of the analog-to-digital conversion circuit.

Illustratively, the isolation circuit 301 includes: the electroencephalogram signal trap is connected with the electroencephalogram signal digital-to-analog conversion circuit and the control circuit 400 and is configured to trap a second electroencephalogram analog signal; the electrocardiosignal wave trap is connected with the electrocardiosignal digital-to-analog conversion circuit and the control circuit 400 and is configured to trap the second electrocardio analog signal; the electromyographic signal trap is connected with the electromyographic signal digital-to-analog conversion circuit and the control circuit 400 and is configured to trap the second electromyographic analog signal; a temperature signal filter connected to the temperature signal digital-to-analog conversion circuit and the control circuit 400, and configured to filter the second temperature analog signal; a respiratory signal filter, connected to the respiratory signal digital-to-analog conversion circuit and the control circuit 400, configured to filter the second respiratory analog signal; the blood oxygen signal filter is connected to the blood oxygen signal digital-to-analog conversion circuit and the control circuit 400, and configured to filter the second blood oxygen analog signal.

In this embodiment, different interference signals in the second analog signal are filtered in a targeted manner through a plurality of sub-circuits of the isolation circuit 301, so as to achieve the best isolation effect, that is, the electroencephalogram signal trap performs trapping on the second electroencephalogram analog signal, the electrocardio signal trap performs trapping on the second electrocardio analog signal, the electromyogram signal trap performs trapping on the second electromyogram analog signal, the temperature signal filter filters the second temperature analog signal, the respiratory signal filter filters the second respiratory analog signal, and the blood oxygen signal filter filters the second blood oxygen analog signal.

Fig. 4 is a schematic circuit diagram of an example of a wave trap of a human physiological signal acquisition circuit provided by an embodiment of the present application, as shown in fig. 4, each of the electroencephalogram signal wave trap, the electrocardiograph signal wave trap and the electromyogram signal wave trap includes a wave trap component, the wave trap component may include a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first operational amplifier a1 and a second operational amplifier a2, a first end of the first capacitor C and a first end of the first resistor R1 are commonly connected to a second electroencephalogram analog signal input terminal of the wave trap component, a second electrocardiograph analog signal input terminal of the wave trap component or a second electromyogram analog signal input terminal of the wave trap component, a second end of the first capacitor C1 and a first end of the second capacitor C2 are commonly connected to a first end of a third resistor R3, the second end of the first resistor R1 and the first end of the second resistor R2 are commonly connected to the first end of the third capacitor C3, the second end of the second capacitor C2 and the second end of the second resistor R2 are commonly connected to the positive input terminal of the first operational amplifier a1, the second end of the third resistor R3, the second end of the third capacitor C3 and the output terminal of the second operational amplifier a2 are commonly connected to the negative input terminal of the second operational amplifier a2, the output terminal of the first operational amplifier a1, the negative input end of the first operational amplifier A1 and the first end of the fourth resistor R4 are commonly connected to the second electroencephalogram analog signal output end of the notch component, the second electrocardiogram analog signal output end of the notch component or the second electromyogram analog signal output end of the notch component, the positive input end of the second operational amplifier A2 and the second end of the fourth resistor R4 are commonly connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is connected to the power ground.

In this embodiment, the second operational amplifier a2 is used as an amplifier, the output terminal thereof is used as the output of the whole circuit, the first operational amplifier a1 is connected in the form of a voltage follower, and the first capacitor C1, the second capacitor C2, the third resistor R3, the first resistor R1, the second resistor R2, and the third capacitor C3 constitute a dual T network circuit, because the dual T network circuit can achieve better attenuation characteristic only when being far from the center frequency, the quality factor Q value of the dual T network circuit is not high. In this embodiment, the Q value is improved by adding the voltage follower formed by the first operational amplifier a1, and the filtering characteristics of the trap filter, including the bandwidth of the band-stop filtering and the Q value, are controlled by adjusting the resistances of the first resistor R1 and the second resistor R2.

Fig. 5 is an exemplary schematic circuit diagram of a filter of a human physiological signal acquisition circuit provided by an embodiment of the present application, and as shown in fig. 5, the temperature signal filter, the respiration signal filter, and the blood oxygen signal filter each include a filtering component, which may include a load resistor RL, a first electrolytic capacitor MC1, and a second electrolytic capacitor MC 2; a first end of the load resistor RL and a first end of the first electrolytic capacitor MC1 are commonly connected to the second temperature analog signal input end of the filtering component, the second respiration analog signal input end of the filtering component or the second blood oxygen analog signal input end of the filtering component, a second end of the load resistor RL and a first end of the second electrolytic capacitor MC2 are commonly connected to the second temperature analog signal output end of the filtering component, the second respiration analog signal output end of the filtering component or the second blood oxygen analog signal output end of the filtering component, and a second end of the first electrolytic capacitor MC1 and a second end of the second electrolytic capacitor MC2 are commonly connected to the power ground.

In the embodiment, the load resistor RL has a voltage reduction effect on the input signal voltage, when the load resistor RL is combined with the electrolytic capacitor, more pulsating alternating current components are reduced on the load resistor RL, the influence on the load is reduced, and finally the filtering is realized.

Fig. 6 is a schematic structural diagram of an electroencephalogram sensor of a human physiological signal acquisition circuit provided in an embodiment of the present application, and as shown in fig. 6, for example, the electroencephalogram sensor may include an electroencephalogram interface configured to forward an electroencephalogram signal of a human body; the first filtering circuit is connected with the electroencephalogram interface and is configured to filter the electroencephalogram signal according to the electroencephalogram negative feedback signal; the first operational amplifier follower is connected with the first filter circuit and configured to follow and output the filtered electroencephalogram signal; the first instrument operational amplification circuit is connected with the first operational amplifier follower and is configured to amplify the electroencephalogram signals output by the first operational amplifier follower so as to generate first electroencephalogram analog signals; and the first common-mode feedback suppression circuit is connected with the first instrument operational amplification circuit and the first filter circuit and is configured to output an electroencephalogram negative feedback signal according to the first electroencephalogram analog signal.

In this embodiment, wear the brain electrical sensor in human head forehead leaf department, receive human brain electrical signal through the brain electrical interface, send to first filter circuit and carry out the filtering according to brain electrical negative feedback signal, then follow output through first operational amplifier follower in proper order and improve input impedance, first instrument operation amplifier circuit amplifies and generates first brain electrical simulation signal output to analog to digital conversion circuit 200, simultaneously, still adopt first common mode feedback suppression circuit to output brain electrical negative feedback signal to first filter circuit according to first brain electrical simulation signal and eliminate human self noise.

Fig. 7 is a schematic structural diagram of an electrocardiograph sensor of a human physiological signal acquisition circuit according to an embodiment of the present application, and as shown in fig. 7, the electrocardiograph sensor may include an electrocardiograph interface configured to forward an electrocardiograph signal of a human body; the lead filtering circuit is connected with the electrocardio interface and is configured to filter the electrocardio signal according to the electrocardio negative feedback signal; the lead operational amplifier follower is connected with the lead filter circuit and is configured to follow and output the filtered electrocardiosignals; the second instrument operational amplification circuit is connected with the lead operational amplifier follower and is configured to amplify the electrocardiosignals output by following so as to output first electrocardio analog signals; and the second common-mode feedback suppression circuit is connected with the second instrument operational amplification circuit and the lead filter circuit and is configured to output an electrocardio negative feedback signal according to the first electrocardio analog signal.

In this embodiment, the electrocardiographic interface is worn on the left wrist and the right wrist of the human body, receives electrocardiographic signals of the human body through the electrocardiographic interface and sends the electrocardiographic signals to the lead filter circuit, then the electrocardiographic signals are sequentially filtered through the lead filter circuit, the lead operational amplifier follower performs following output to improve input impedance, the second instrument operational amplifier circuit performs amplification to a preset acquisition range and outputs a first electrocardiographic analog signal to the analog-to-digital conversion circuit 200, and meanwhile, the second common mode feedback suppression circuit outputs electrocardiographic negative feedback signals to the lead filter circuit according to the first electrocardiographic analog signal to eliminate self noise of the human body. The lead filter circuit and the lead operational amplifier follower can be correspondingly arranged one to a plurality of so as to improve the accuracy of electrocardiosignal acquisition.

Fig. 8 is a schematic structural diagram of an electromyographic sensor of a human body physiological signal acquisition circuit provided in an embodiment of the present application, and as shown in fig. 8, an electromyographic sensor may include an electromyographic interface configured to forward an electromyographic signal of a human body, for example; the shunt voltage reference circuit is connected with the myoelectricity interface and is configured to boost the myoelectricity signal according to the myoelectricity negative feedback signal; the filtering and amplifying circuit is connected with the shunt voltage reference circuit and is configured to filter and amplify the boosted electromyographic signals to output first electromyographic analog signals; and the third common-mode feedback suppression circuit is connected with the filtering amplification circuit and the shunt voltage reference circuit and is configured to generate an electromyographic negative feedback signal according to the first electromyographic analog signal.

In this embodiment, the myoelectric interface is worn on the right arm or the left arm of the human body, the myoelectric signal of the human body is received through the myoelectric interface and sent to the shunt voltage reference circuit, then boosting is performed according to the myoelectric negative feedback signal through the shunt voltage reference circuit in sequence (i.e. the weak myoelectric signal is modulated on the reference voltage), the first myoelectric analog signal is output after filtering and amplifying is performed by the filter amplifying circuit, and meanwhile, the myoelectric negative feedback signal is generated according to the first myoelectric analog signal by the third common mode feedback suppression circuit and sent to the shunt voltage reference circuit to eliminate the self noise of the human body.

Fig. 9 is a schematic structural diagram of a temperature sensor of a human physiological signal acquisition circuit provided in an embodiment of the present application, and as shown in fig. 9, the temperature sensor may include a body temperature interface configured to forward a temperature signal of a human body, for example; the first-stage filter circuit is connected with the body temperature interface and is configured to filter the temperature signal; the second operational amplifier follower is connected with the first-stage filter circuit and is configured to follow and output the temperature signal filtered by the first-stage filter circuit; the second-stage filter circuit is connected with the second operational amplifier follower and is configured to filter the temperature signal output by the second operational amplifier follower; the signal processing circuit is connected with the second-stage filter circuit and is configured to perform current-voltage conversion processing on the temperature signal filtered by the second-stage filter circuit to obtain an initial temperature analog signal; and the error calibration circuit is connected with the signal processing circuit and is configured to carry out differential input calibration on the initial temperature analog signal so as to generate a first temperature analog signal.

In this embodiment, wear the body temperature interface at human belly, accept the body temperature signal of human and send to first level filter circuit through the body temperature interface, then carry out first filtering through first level filter circuit in proper order, the output is followed to second operational amplifier follower and input impedance is improved, second level filter circuit carries out the second filtering, signal processing circuit carries out current-voltage conversion processing, error calibration circuit carries out difference input calibration and generates first temperature analog signal after, accurate to the three-digit behind the decimal point, the precision is higher than the general body temperature measurement sensor precision on the market, wherein, error calibration circuit can also realize reference adjustment through adjusting the potentiometre.

Fig. 10 is a schematic structural diagram of a respiration sensor of a human physiological signal acquisition circuit provided in an embodiment of the present application, and as shown in fig. 10, the respiration sensor may include a respiration interface, a first-stage amplification circuit, a dc cancellation circuit, a second-stage amplification circuit, and a charge holding circuit, which are connected in sequence.

In the embodiment, the breathing interface is worn on the chest of a human body to test chest breathing, the breathing interface receives breathing signals of the human body and sends the breathing signals to the first-stage amplifying circuit, the breathing signals are sequentially subjected to first amplification by the first-stage amplifying circuit, direct current noise introduced in the transmission process is eliminated by the direct current eliminating circuit, the second-stage amplifying circuit performs second amplification, and the charge holding circuit holds charges to a preset range to generate a first breathing analog signal.

Fig. 11 is a schematic structural diagram of an blood oxygen sensor of a human physiological signal acquisition circuit according to an embodiment of the present disclosure, and as shown in fig. 11, the blood oxygen sensor may include a constant current source circuit, a light source driving circuit, a blood oxygen interface, a differential amplifying circuit, and a low-pass filtering circuit, which are connected in sequence.

In this embodiment, wear the blood oxygen interface at human forefinger anterior segment, the electric current flows into constant current source circuit from aviation plug, drive light source drive circuit begins to work, emit infrared light promptly, infrared light pierces through the forefinger and carries human oxyhemoglobin saturation signal after by the decay to enter into differential amplifier and carry out differential amplification, generate first blood oxygen analog signal after filtering through low pass filter circuit again, this embodiment adopts the photoelectric method to measure oxyhemoglobin saturation signal, it is more accurate.

Illustratively, the human physiological signal acquisition circuit may further include: the communication circuit 500 is connected with the control circuit 400 and configured to send the human physiological parameter information to an upper computer.

In this embodiment, the communication circuit 500 may be a wireless device such as a bluetooth device, and is configured to remotely transmit the human physiological parameter information acquired by the human physiological signal acquisition circuit to an upper computer.

Fig. 12 is a schematic structural diagram of a terminal device of a human physiological signal acquisition circuit provided in an embodiment of the present application, and as shown in fig. 12, for example, the terminal device may include a human physiological signal acquisition circuit; and the upper computer 600 is connected with the human physiological signal acquisition circuit and used for displaying the human physiological parameter information.

In this embodiment, the control circuit 400 encrypts the signal filtered by the dac circuit 300 to obtain an encrypted signal, the encrypted signal is transmitted to the upper computer 600 through the communication circuit 500, and the encrypted signal is decrypted and displayed in time domain and frequency domain through the upper computer 600 for viewing, so that the acquired human physiological signal is transmitted in a digital signal form, noise influence in the transmission process is reduced, and accuracy of information acquisition is improved.

In the specific use process, a proper amount of conductive paste is coated on an electrode clamp of the electrocardio sensor, and the electrode clamp is clamped on the left arm and the right arm of a patient; coating a proper amount of conductive paste on an electrode of the electroencephalogram sensor, and wearing the electrode on the head of a patient; attaching a piezoelectric film of a respiration sensor to the abdomen of a patient; clamping the blood oxygen sensor at the index finger end of a patient; sticking the myoelectric sensor dry electrode on the arm of a patient; the temperature sensors are attached to the surface of the skin of a patient, and the system is powered on after the sensors are worn correctly.

The human physiological signal is acquired by the signal acquisition circuit 100 to obtain a first analog signal, the first analog signal is converted into a digital signal by the analog-to-digital conversion circuit 200 and is transmitted by a line, the second analog signal is converted by the digital-to-analog conversion circuit 300 and is output to the control circuit 400 after isolation filtering processing, the signal after filtering processing is encrypted by the control circuit 400 to obtain an encrypted signal, the encrypted signal is transmitted to the upper computer 600 in a protocol packet mode by the communication circuit 500, relevant parameter setting is carried out by the upper computer 600, such as inputting the name and age of a tested person, selecting a serial port number, a baud rate and the like, the upper computer 600 firstly decrypts the received encrypted signal, restores the analog signal of the human physiological signal, then carries out frequency domain transformation, removes noise by self-adaptive filtering and wavelet transformation, and adopts a high-pass filter to remove baseline drift, therefore, the electroencephalogram signal, the electrocardiosignal, the myoelectricity signal and the respiration signal are presented in the form of a waveform diagram, and the temperature signal and the blood oxygen signal are displayed in the form of numerical values.

FIG. 13(a) is a waveform diagram of an electroencephalogram signal acquired by a conventional electrode; fig. 13(b) is a waveform diagram of an electroencephalogram signal acquired by the electroencephalogram sensor provided in the embodiment of the present application; as shown in fig. 13(a) and 13(b), the electroencephalogram signals collected by the electroencephalogram sensor are better in quality and smaller in interference noise than the electroencephalogram signals collected by the traditional electrodes.

FIG. 14(a) is a waveform diagram of an electrocardiographic signal acquired by a conventional electrode; FIG. 14(b) is a waveform diagram of an ECG signal collected by an ECG sensor according to an embodiment of the present application; as shown in fig. 14(a) and 14(b), compared with the electrocardiographic signals acquired by the conventional electrodes, the electrocardiographic signals acquired by the electrocardiographic sensor of the present application have less interference noise and better signal quality.

FIG. 15(a) is a waveform diagram of a respiratory signal acquired by a conventional electrode; fig. 15(b) is a waveform diagram of a respiration signal acquired by a respiration sensor provided in an embodiment of the present application; as shown in fig. 15(a) and 15(b), the respiration signal acquired by the respiration sensor of the present application has less interference noise and more obvious peaks and valleys compared with the respiration signal acquired by the conventional electrode.

FIG. 16(a) is a waveform diagram of an electromyographic signal collected by a conventional electrode; fig. 16(b) is a waveform diagram of an electromyographic signal collected by an electromyographic sensor according to an embodiment of the present application; as shown in fig. 16(a) and 16(b), compared with the electromyographic signals acquired by the traditional electrodes, the electromyographic signals acquired by the electromyographic sensor of the present application have fewer clutter and better signal quality.

Fig. 17 is a plurality of human physiological signals of a mild depression patient acquired by the human physiological signal acquisition circuit provided in the embodiment of the present application, as shown in fig. 17, the first channel, the second channel, and the third channel are electroencephalogram signals, the fourth channel is an electromyogram signal, the fifth channel is a respiratory signal, the sixth channel is not used, the seventh channel is an electrocardiograph signal, the lower left corner of the figure is a two-channel body temperature signal and a blood oxygen saturation measurement value, and these signals can be displayed in real time and stored completely, so that medical staff can check the patient's condition at any time in the later stage, and an optimal treatment scheme is provided.

The application can also adopt the carbon fiber material for the shell material, and the components and parts can adopt the structure with smaller size, thereby being convenient to carry.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiments provided in the present application, it should be understood that the disclosed terminal device and method may be implemented in other ways. For example, the above-described terminal device embodiments are merely illustrative, and for example, a module or a unit may be divided into only one logical function, and may be implemented in other ways, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A human physiological signal acquisition circuit, comprising:

2. The human physiological signal acquisition circuit according to claim 1, wherein the human physiological signal comprises an electroencephalogram signal, an electrocardiosignal, an electromyogram signal, a temperature signal, a respiration signal, and a blood oxygen signal; the first analog signal comprises a first electroencephalogram analog signal, a first electrocardiogram analog signal, a first electromyogram analog signal, a first temperature analog signal, a first respiration analog signal and a first blood oxygen analog signal; the signal acquisition circuit includes:

3. The human physiological signal acquisition circuit according to claim 2, further comprising:

4. The human physiological signal acquisition circuit according to claim 2, further comprising:

5. The human physiological signal acquisition circuit of claim 4, wherein the digital signal comprises an electroencephalogram digital signal, an electrocardiograph digital signal, an electromyography digital signal, a temperature digital signal, a respiration digital signal, and a blood oxygen digital signal; the analog-to-digital conversion circuit includes:

and the blood oxygen signal analog-to-digital conversion circuit is connected with the blood oxygen sensor and the digital-to-analog conversion circuit and is configured to convert the first blood oxygen analog signal into the blood oxygen digital signal.

6. The human physiological signal acquisition circuit of claim 5, wherein the second analog signal comprises a second electroencephalogram analog signal, a second electrocardiograph analog signal, a second electromyography analog signal, a second temperature analog signal, a second respiration analog signal, and a second blood oxygen analog signal; the digital-to-analog conversion circuit includes:

7. The human physiological signal acquisition circuit of claim 6, wherein the isolation circuit comprises:

8. The human physiological signal acquisition circuit of claim 7, wherein the electroencephalogram signal trap, the electrocardiosignal trap and the electromyogram signal trap each comprise a trap component, and the trap component comprises a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first operational amplifier and a second operational amplifier;

the first end of the first capacitor and the first end of the first resistor are commonly connected to the second electroencephalogram analog signal input end of the notch component, the second electrocardiogram analog signal input end of the notch component or the second electromyogram analog signal input end of the notch component, the second end of the first capacitor and the first end of the second capacitor are commonly connected to the first end of the third resistor, the second end of the first resistor and the first end of the second resistor are commonly connected to the first end of the third capacitor, the second end of the second capacitor and the second end of the second resistor are commonly connected to the positive input end of the first operational amplifier, the second end of the third resistor, the second end of the third capacitor and the output end of the second operational amplifier are commonly connected to the negative input end of the second operational amplifier, the output end of the first operational amplifier, the output end of the second operational amplifier, the first end of the second capacitor and the first end of the second capacitor are commonly connected to the negative input end of the second operational amplifier, and the second end of the first operational amplifier is connected to the negative input end of the second operational amplifier, The negative input end of the first operational amplifier and the first end of the fourth resistor are connected to the second electroencephalogram analog signal output end of the notch component, the second electrocardiogram analog signal output end of the notch component or the second electromyogram analog signal output end of the notch component, the positive input end of the second operational amplifier and the second end of the fourth resistor are connected to the first end of the fifth resistor, and the second end of the fifth resistor is connected to the power ground.

9. The human physiological signal acquisition circuit of claim 7, wherein the temperature signal filter, the respiration signal filter and the blood oxygen signal filter each comprise a filtering component, the filtering component comprising a load resistor, a first electrolytic capacitor and a second electrolytic capacitor;

10. The human physiological signal acquisition circuit according to any one of claims 2 to 9, wherein the electroencephalogram sensor includes:

11. The human physiological signal acquisition circuit according to any one of claims 2 to 9, wherein the electrocardiograph sensor comprises:

12. The human physiological signal acquisition circuit according to any one of claims 2 to 9, wherein the electromyographic sensor comprises:

13. The human physiological signal acquisition circuit according to any one of claims 2-9, wherein the temperature sensor comprises:

14. The human physiological signal acquisition circuit according to claim 1, further comprising:

15. A terminal device, comprising:

a human physiological signal acquisition circuit according to any one of claims 1-14; and