阅读说明：本技术 一种无线体域网通信系统 (Wireless body area network communication system ) 是由 赵健 杨华中 刘勇攀 于 2019-03-18 设计创作，主要内容包括：本发明实施例提供一种无线体域网通信系统。该系统包括：发射端和接收端；接收端包括负载电阻、数控电感阵列和损耗补偿器；负载电阻和数控电感阵列依次串联于信号电极和地电极间,所述损耗补偿器与所述负载电阻和所述数控电感阵列并联；负载电阻根据发射端发射的激励信号生成电压信号；损耗补偿器根据电压信号生成控制信号；数控电感阵列根据控制信号从数控电感阵列的多个电感中确定若干个电感作为补偿电感,并通过补偿电感对无线体域网通信系统中的反向路径损耗进行补偿。本发明实施例提供的系统,能够在人体姿态变化过程中动态且有效的对系统中的反向路径损耗进行补偿,使得系统的功耗大幅降低。(The embodiment of the invention provides a wireless body area network communication system. The system comprises: a transmitting end and a receiving end; the receiving end comprises a load resistor, a numerical control inductor array and a loss compensator; the load resistor and the numerical control inductance array are sequentially connected in series between the signal electrode and the ground electrode, and the loss compensator is connected with the load resistor and the numerical control inductance array in parallel; the load resistor generates a voltage signal according to the excitation signal transmitted by the transmitting terminal; the loss compensator generates a control signal according to the voltage signal; the numerical control inductor array determines a plurality of inductors from a plurality of inductors of the numerical control inductor array as compensation inductors according to the control signals, and compensates the reverse path loss in the wireless body area network communication system through the compensation inductors. The system provided by the embodiment of the invention can dynamically and effectively compensate the reverse path loss in the system in the human body posture change process, so that the power consumption of the system is greatly reduced.)

1. A wireless body area network communication system, comprising: a transmitting end and a receiving end; wherein, the receiving end includes:

the device comprises a load resistor, a numerical control inductor array and a loss compensator; wherein the content of the first and second substances,

the load resistor and the numerical control inductance array are sequentially connected in series between a signal electrode and a ground electrode, and the loss compensator is connected with the load resistor and the numerical control inductance array in parallel;

the load resistor is used for generating a voltage signal according to the excitation signal transmitted by the transmitting end;

the loss compensator is used for generating a control signal according to the voltage signal;

and the numerical control inductor array is used for determining a plurality of inductors from a plurality of inductors of the numerical control inductor array as compensation inductors according to the control signals, and compensating the reverse path loss in the wireless body area network communication system through the compensation inductors.

2. The system of claim 1, wherein the loss compensator comprises:

a digital signal strength detector for converting the voltage signal into a digital strength signal;

a gradient detector for generating a gradient signal according to the digital intensity signal and a first timing control signal;

the controller is used for generating a first control signal according to the gradient signal and the second time sequence control signal;

and the disturbance exciter is used for generating a second control signal according to the first control signal and a third time sequence control signal and taking the second control signal as the control signal.

3. The system of claim 2, wherein the digital signal strength detector comprises:

a logarithmic amplifier for converting the voltage signal to an analog intensity signal;

an analog-to-digital converter for converting the analog intensity signal to the digital intensity signal.

4. The system of claim 2, wherein the gradient detector comprises:

a first register for generating a first intensity signal according to the digital intensity signal and the first timing control signal;

the second register is used for generating a second intensity signal according to the digital intensity signal and a primary delay signal of the first time sequence control signal;

a first adder for adding the first intensity signal and the second intensity signal to generate a third intensity signal;

and the third register is used for generating the gradient signal according to the third strength signal and the secondary delay signal of the first time sequence control signal.

5. The system of claim 2, wherein the transfer function H of the controller_c(z) is:

wherein, K_cFor the gain of the controller, Z is the Z transform operator, T_sIs the period, ω, of the second timing control signal_zZero point, ω, of the controller_pBeing the poles of the controller.

6. The system of claim 2, wherein the perturbation actuator comprises:

an excitation signal generator for generating a bi-phase pulse excitation signal every time the third timing control signal generates a rising edge;

and the second adder is used for adding the biphase pulse excitation signal and the first control signal to generate the second control signal, and the second control signal is used as the control signal.

7. The system of claim 6, wherein the first timing control signal, the second timing control signal, and the third timing control signal all have equal periods, and wherein the width of the bi-phase pulse excitation signal is less than one-half of the period.

8. The system of claim 7, wherein the first timing control signal is the third timing control signal delayed by T_d1Obtaining that the second time sequence control signal is the third time sequence control signal delay T_d2To obtain a mixture of, among others,

T_p＜T_d2＜T_s；

wherein, T_pWidth, T, of said biphasic pulse excitation signal_sIs the period.

9. The system of claim 8, wherein the first time delay signal of the first timing control signal is the first timing signal delay time T_pAnd/2 obtaining that the secondary delay signal of the first time sequence control signal is the first time sequence signal delay T_pThus obtaining the product.

Technical Field

The embodiment of the invention relates to the technical field of wireless body area networks, in particular to a wireless body area network communication system.

Background

Wireless Body Area Networks (WBANs) refer to information networks established between electronic devices carried by individuals. To facilitate the development of wireless body area networks, the wireless body area network standard ieee802.15.6 was formally established in 2012. Three types of signal frequency bands for wireless body area network communication are specified in the standard: narrowband (NB), Ultra Wideband (UWB), and Human Body Communication (HBC) frequency bands. The narrow band and the ultra wide band both belong to radio frequency communication modes, and human body communication is a non-radio frequency communication mode which takes human bodies as conductors and uses the human bodies as channels to complete signal conduction. Compared with a radio frequency communication mode, the human body communication utilizes the characteristic of low loss of the human body, does not need an antenna or a coil, and is expected to really realize low power consumption and miniaturization of the wireless body area network.

For a wireless body area network communication system based on human body communication, according to different coupling modes, the wireless body area network communication system based on capacitive coupling and the wireless body area network communication system based on current coupling can be divided. The wireless body area network communication system based on capacitive coupling establishes a communication loop by respectively carrying out capacitive coupling on two electrodes of a transmitting end or a receiving end with a human body and air, and further realizes signal conduction.

Fig. 1 is a schematic structural diagram of a wireless body area network communication system in the prior art, and as shown in fig. 1, the system is a wireless body area network communication system based on capacitive coupling and includes a transmitting end and a receiving end, wherein the transmitting end includes a signal electrode SE_txAn AC signal source and a ground electrode GE_txThe receiving end comprises a signal electrode SE_rxA load resistor and a ground electrode GE_rx. Wherein the signal electrode SE_txAnd a signal electrode SE_rxAre all attached to the surface of the human body, at the moment, the signal electrode SE_txHuman body signal electrode SE_rxForm a forward path, a ground electrode GE_txAir-ground electrode GE_rxWhich constitutes the reverse path. Since the conductivity of the coupling capacitance in air is much lower than that of the human body, the reverse path loss is much higher than the forward path loss.

To keep the power consumption of the wireless body area network communication system low, compensation for reverse path loss is required. FIG. 2 is a schematic diagram of a prior art wireless body area network communication system with compensation function, as shown in FIG. 2, typically via a signal electrode SE at the receiving end_rxAnd ground electrode GE_rxA fixed inductor is connected in series between the two inductors to realize compensation of reverse path loss. However, the reverse path loss varies with the change of the human body posture, and the prior art cannot effectively compensate the reverse path loss in the dynamic change process of the human body posture, so that the low power consumption of the system cannot be maintained. Therefore, it is an urgent need to provide a wireless body area network communication system capable of effectively compensating for the reverse path loss during the dynamic change of the human body posture.

Disclosure of Invention

To solve the technical problems in the prior art, an embodiment of the present invention provides a wireless body area network communication system.

In a first aspect, an embodiment of the present invention provides a wireless body area network communication system, including:

a transmitting end and a receiving end; wherein, the receiving end includes:

the device comprises a load resistor, a numerical control inductor array and a loss compensator; wherein the content of the first and second substances,

the load resistor and the numerical control inductance array are sequentially connected in series between a signal electrode and a ground electrode, and the loss compensator is connected with the load resistor and the numerical control inductance array in parallel;

the load resistor is used for generating a voltage signal according to the excitation signal transmitted by the transmitting end;

the loss compensator is used for generating a control signal according to the voltage signal;

and the numerical control inductor array is used for determining a plurality of inductors from a plurality of inductors of the numerical control inductor array as compensation inductors according to the control signals, and compensating the reverse path loss in the wireless body area network communication system through the compensation inductors.

According to the wireless body area network communication system provided by the embodiment of the invention, the load resistor and the numerical control inductor array are connected in series in the signal electrode and the ground electrode of the receiving end, the first end of the loss compensator is connected to the lead between the signal electrode and the load resistor, and the second end of the loss compensator is connected to the numerical control inductor array, so that the load resistor can generate a voltage signal according to an excitation signal transmitted by an alternating current signal source of the transmitting end and transmit the voltage signal to the numerical control inductor array, the numerical control inductor array further determines a compensation inductor, and the reverse path loss in the wireless body area network communication system is compensated through the compensation inductor. The alternating current signal source of the transmitting end can periodically or aperiodically transmit the excitation signal in the human body posture change process, so that each time the transmitting end transmits one excitation signal, the receiving end can correspondingly generate one voltage signal, the compensation inductance is determined in the numerical control inductance array through the voltage signal, the reverse path loss in the system is compensated through the compensation inductance, the reverse path loss in the system can be dynamically and effectively compensated in the human body posture change process, and the power consumption of the system is greatly reduced.

Drawings

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

FIG. 1 is a schematic diagram of a prior art wireless body area network communication system;

fig. 2 is a schematic diagram of a prior art wireless body area network communication system with compensation;

fig. 3 is a schematic structural diagram of a wireless body area network communication system according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a wireless body area network communication system according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a loss compensator according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a gradient detector according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 3 is a schematic structural diagram of a wireless body area network communication system according to an embodiment of the present invention, and as shown in fig. 3, the system includes: a transmitting end 31 and a receiving end 32; wherein, the receiving end 32 includes:

a load resistor 321, a digitally controlled inductor array 322 and a loss compensator 323;

wherein, the load resistor 321 and the digital control inductor array 322 are sequentially connected in series to the signal electrode SE_rxAnd ground electrode GE_rxIn between, the loss compensator 323 is connected in parallel with the load resistor 321 and the digitally controlled inductor array 322;

the load resistor 321 is configured to generate a voltage signal according to the excitation signal transmitted by the transmitting terminal 31;

the loss compensator 323 is configured to generate a control signal according to the voltage signal;

the digitally controlled inductor array 322 is configured to determine, according to the control signal, a plurality of inductors from the plurality of inductors of the digitally controlled inductor array 322 as compensation inductors, and compensate for reverse path loss in the wireless body area network communication system through the compensation inductors.

First, the transmitting end 31 will be specifically described with reference to fig. 3:

the transmitting end 31 includes: signal electrodes SE connected in series in sequence_txAC signal source 311 and ground electrode GE_tx. Wherein the AC signal source 311 generates periodically or non-periodically an excitation signal, which can make the signal electrode SE_txAnd ground electrode GE_txGenerates an AC voltage therebetween, and the AC voltage is transmitted to the receiving terminal 32 through the coupling capacitor in the human body and the air, so that the signal electrode SE of the receiving terminal 32_rxAnd ground electrode GE_rxAn alternating voltage is generated which causes the load resistor 321 to generate a voltage signal. The load resistor is a high-power energy-consuming resistor which is generally used in products such as large-scale power supply equipment, medical equipment, electric power equipment and the like and is used for absorbing surplus power.

Next, the receiving end 32 will be specifically described with reference to fig. 3:

the receiving end 32 includes: signal electrodes SE connected in series in sequence_rxLoad resistor 321, numerical control inductor array 322 and ground electrode GE_rxAnd a loss compensator 323.

Wherein a first terminal of the loss compensator 323 is electrically connected to the signal electrode SE_rxAnd a conducting wire between the load resistor 321 for obtaining a voltage signal generated by the load resistor 321 to generate a control signal according to the voltage signal, and a second end of the loss compensator 323 is electrically connected to the digitally controlled inductor array 322 to send the control signal to the digitally controlled inductor array 322.

It should be noted that, the digitally controlled inductor array 322 includes an inductor controller and a plurality of inductors, and the inductor controller may determine a part of or all of the inductors as compensation inductors according to the received control signal, so as to directly compensate the reverse path loss in the wireless body area network communication system through the compensation inductors.

Referring to fig. 4, the digitally controlled inductor array 322 in the embodiment of the present invention is further described, fig. 4 is a schematic diagram of a specific structure of a wireless body area network communication system provided in the embodiment of the present invention, as shown in fig. 4, the digitally controlled inductor array 322 includes an inductor controller and a plurality of inductors connected in series in sequence, where the inductor controller is a plurality of switches, the plurality of inductors connected in series in sequence correspond to the plurality of switches one by one, and each inductor is connected in parallel with the corresponding switch. The switches can be opened or closed according to the received control signal, so that the inductance corresponding to the switch in the open state is used as compensation inductance, and the reverse path loss in the wireless body area network communication system is compensated through the compensation inductance.

The inductance values of the plurality of inductors connected in series increase in sequence, and the inductance values of the adjacent inductors have a relationship of 2 times or approximately 2 times.

It is understood that, in the system in fig. 4, if the number of inductors is N, the number of switches is also N, if N is 5, the number of inductors is 5, the number of switches is also 5, and the inductance values of the 5 inductors increase from left to right. If the 5 inductors are sequentially referred to as inductor 1, inductor 2, inductor 3, inductor 4, and inductor 5 from left to right, the inductance of inductor 2 is 2 times or approximately 2 times the inductance of inductor 1, the inductance of inductor 3 is 2 times or approximately 2 times the inductance of inductor 2, and so on, and will not be described herein again.

At this time, the control signal is a binary digital signal of 5 bits, for example, 10001, 00111, and the like. If the control signal is 10001, the highest bit 1 and the lowest bit 1 are respectively used to control the switch corresponding to the inductor 1 and the switch corresponding to the inductor 5, and the three 0 s from left to right in the middle are respectively used to control the switch corresponding to the inductor 2, the switch corresponding to the inductor 3 and the switch corresponding to the inductor 4. If the switch is controlled to be closed by 1 and the switch is controlled to be opened by 0, the switch corresponding to the inductor 1 and the switch corresponding to the inductor 5 are both closed, the switch corresponding to the inductor 2, the switch corresponding to the inductor 3 and the switch corresponding to the inductor 4 are both opened, and at the moment, the inductor 2, the inductor 3 and the inductor 4 are connected in series to the ground electrode GE together as the compensation inductor_rxAnd a load resistor, for compensating for reverse path loss in the wireless body area network communication system.

According to the system provided by the embodiment of the invention, the load resistor and the numerical control inductor array are connected in series in the signal electrode and the ground electrode of the receiving end, the first end of the loss compensator is connected to the lead between the signal electrode and the load resistor, and the second end of the loss compensator is connected to the numerical control inductor array, so that the load resistor can generate a voltage signal according to an excitation signal transmitted by an alternating current signal source of the transmitting end and transmit the voltage signal to the numerical control inductor array, the numerical control inductor array further determines a compensation inductor, and the reverse path loss in the wireless body area network communication system is compensated through the compensation inductor. The alternating current signal source of the transmitting end can periodically or aperiodically transmit the excitation signal in the human body posture change process, so that each time the transmitting end transmits one excitation signal, the receiving end can correspondingly generate one voltage signal, the compensation inductance is determined in the numerical control inductance array through the voltage signal, the reverse path loss in the system is compensated through the compensation inductance, the reverse path loss in the system can be dynamically and effectively compensated in the human body posture change process, and the power consumption of the system is greatly reduced.

On the basis of the above embodiments, the embodiments of the present invention specifically describe the loss compensator in the above embodiments, that is, the loss compensator includes:

a digital signal strength detector for converting the voltage signal into a digital strength signal;

a gradient detector for generating a gradient signal according to the digital intensity signal and a first timing control signal;

the controller is used for generating a first control signal according to the gradient signal and the second time sequence control signal;

and the disturbance exciter is used for generating a second control signal according to the first control signal and a third time sequence control signal and taking the second control signal as the control signal.

Specifically, the loss compensator provided in the embodiment of the present invention is specifically described with reference to fig. 5, where fig. 5 is a schematic structural diagram of the loss compensator provided in the embodiment of the present invention, and as shown in fig. 5, the loss compensator includes: a digital signal strength detector 3231, a gradient detector 3232, a controller 3233 and a perturbation driver 3234 electrically connected in sequence. Wherein:

a digital signal strength detector 3231 for obtaining a voltage signal V generated by the load resistor_rxThe voltage signal V is applied_rxConversion to digital intensityAnd outputting the degree signal M.

A gradient detector 3232 for obtaining the digital intensity signal M and receiving the first timing control signal T_c1And controls the signal T at the first timing_c1In one period of (3), the difference between the maximum value and the minimum value of the digital intensity signal M is calculated to form a gradient signal D and output.

A controller 3233, preferably a digital proportional-integral controller, for acquiring the gradient signal D and receiving a second timing control signal T_c2To generate a first control signal L_cAnd output. It should be noted that the digital proportional-integral controller is a linear controller, which forms a control deviation from a given value and an actual output value, and linearly combines the proportion and the integral of the deviation to form a control quantity to control a controlled object.

A disturbance driver 3234 for obtaining the first control signal L_cAnd receives the third timing control signal T_c3To control the signal T according to the third timing_c3Generating a biphasic pulse excitation signal and superimposing it on the first control signal L_cTo form a second control signal L_cpAnd output. It should be noted that the second control signal L_cpThe control signal mentioned in the above embodiment.

On the basis of the foregoing embodiments, the embodiments of the present invention specifically describe the digital signal strength detector in the foregoing embodiments, that is, the digital signal strength detector includes:

a logarithmic amplifier for converting the voltage signal to an analog intensity signal;

an analog-to-digital converter for converting the analog intensity signal to the digital intensity signal.

Specifically, the digital signal strength detector specifically includes: a logarithmic amplifier and an analog-to-digital converter which are electrically connected in turn. The logarithmic amplifier is an amplifying circuit with the output signal amplitude and the input signal amplitude in a logarithmic function relationship. In an embodiment of the invention, a logarithmic amplifier is used to convert the voltage signal V_rxConversion to analogue intensity signal M_aThe conversion relationship is as follows:

M_a＝20log₁₀(V_rx)+M_bias；

wherein M is_biasA constant determined for the circuit.

The analog intensity signal M is then passed through an analog-to-digital converter_aConverted to a digital intensity signal M.

An analog-to-digital converter (a/D converter), or ADC for short, generally refers to a circuit for converting an analog signal into a digital signal. The a/D conversion functions to convert analog quantity continuous in time and continuous in amplitude into digital signal discrete in time and discrete in amplitude, and therefore, the a/D conversion generally includes 4 processes of sampling, holding, quantizing and encoding. In practical circuits, some of these processes are combined, for example, sampling and holding, quantization and coding are often implemented simultaneously in the conversion process.

On the basis of the foregoing embodiments, the gradient detector in the foregoing embodiments is specifically described in an embodiment of the present invention, that is, the gradient detector includes:

a first register for generating a first intensity signal according to the digital intensity signal and the first timing control signal;

the second register is used for generating a second intensity signal according to the digital intensity signal and a primary delay signal of the first time sequence control signal;

a first adder for adding the first intensity signal and the second intensity signal to generate a third intensity signal;

and the third register is used for generating the gradient signal according to the third strength signal and the secondary delay signal of the first time sequence control signal.

Specifically, the gradient detector provided in the embodiment of the present invention is specifically described with reference to fig. 6, where fig. 6 is a schematic structural diagram of the gradient detector provided in the embodiment of the present invention, and as shown in fig. 6, the gradient detector includes: a first register 32321, a second register 32322, a first adder 32323, and a third register 32324. The input end of the first register 32321 is electrically connected to the output end of the analog-to-digital converter in the digital signal strength detector, and the output end of the first register 32321 is electrically connected to the first input end of the first adder 32323; an input end of the second register 32322 is electrically connected with an output end of an analog-to-digital converter in the digital signal strength detector, and an output end of the second register 32322 is electrically connected with a second input end of the first adder 32323; an output of the first adder 32323 is electrically connected to an input of a third register 32324.

It should be noted that a register is a circuit for realizing a register function, and is generally used for temporarily storing binary data or codes being processed during the operation of a digital circuit system, and is a basic module of a digital logic circuit. Adders are devices that generate sums of numbers, often used as computer arithmetic logic units, that perform logical operations, shifts, and instruction calls.

In the embodiment of the invention, the first register 32321 obtains the digital intensity signal M output by the adc in the signal intensity detector, and receives the first timing control signal T_c1According to a first timing control signal T_c1The digital intensity signal M is sampled to obtain a first intensity signal. Wherein the signal T is controlled according to the first timing sequence_c1The digital intensity signal M is sampled when the first timing control signal T is asserted_c1The digital intensity signal M is sampled once every rising edge occurs.

The second register 32322 obtains the digital intensity signal M output by the A/D converter of the signal intensity detector and receives the first timing control signal T_c1Primary delay signal T_c1,dAccording to a time-delayed signal T_c1,dThe digital intensity signal M is sampled to obtain a second intensity signal. It should be noted that the first timing control signal T_c1Primary delay signal T_c1,dI.e. the first timing control signal T_c1The resulting signal is delayed by d. According to a time-delay signal T_c1,dThe digital intensity signal M is sampled, and may be a signal T delayed once_c1,dThe digital intensity signal M is sampled once every rising edge occurs.

The first adder 32323 adds the first intensity signal and the second intensity signal to obtain a third intensity signal, and outputs the third intensity signal.

The third register 32324 obtains a third strength signal output by the first adder, and receives the first timing control signal T_c1Second time delay signal T_c1,ddAccording to a third timing control signal T_c3And sampling the third intensity signal to obtain a gradient signal D and outputting the gradient signal D. It should be noted that the first timing control signal T_c1Second time delay signal T_c1,ddI.e. the first timing control signal T_c1The resulting signal is delayed by twice d. According to the secondary delay signal T_c1,ddThe third strength signal is sampled, which may be when the signal T is twice delayed_c1,ddThe third intensity signal is sampled once every rising edge.

On the basis of the above embodiments, the embodiments of the present invention specifically describe the controller in the above embodiments, that is, the transfer function H of the controller_c(z) is:

wherein, K_cFor the gain of the controller, Z is the Z transform operator, T_sIs the period, ω, of the second timing control signal_zZero point, ω, of the controller_pBeing the poles of the controller.

In particular, the gradient signal D and the transfer function H_c(z) are multiplied to obtain the first control signal L_c。

On the basis of the foregoing embodiments, the embodiments of the present invention specifically describe a disturbance driver in the foregoing embodiments, that is, the disturbance driver includes:

an excitation signal generator for generating a bi-phase pulse excitation signal every time the third timing control signal generates a rising edge;

and the second adder is used for adding the biphase pulse excitation signal and the first control signal to generate the second control signal, and the second control signal is used as the control signal.

Specifically, the disturbance driver includes: a stimulus signal generator and a second adder electrically connected to the stimulus signal generator.

Wherein the excitation signal generator receives a third timing control signal T_c3And every time the third timing control signal T is applied_c3When a rising edge is generated, a dual-phase pulse excitation signal is generated and output to the second adder.

A second adder for adding the two-phase pulse excitation signal and the first control signal L_cAdding the signals to generate the second control signal Lc_pAnd the second control signal Lc is used for controlling the second voltage_pAs the control signal.

In addition to the above embodiments, the present invention specifically describes the periods of the first timing control signal, the second timing control signal, and the third timing control signal and the widths of the dual-phase pulse excitation signals in the above embodiments, that is, the periods of the first timing control signal, the second timing control signal, and the third timing control signal are all equal, and the width of the dual-phase pulse excitation signal is less than one half of the period.

Specifically, in the above-described embodiment, the second timing control signal T has been set_c2Is defined as T_sIn the embodiment of the present invention, the periods of the first timing control signal, the second timing control signal and the third timing control signal are all equal, so the first timing control signal T_c1And a third timing control signal T_c3Are also all T_s。

For a bi-phase pulse excitation signal, its amplitude is + -1, defining its width as T_pThen T is_p＜T_s/2。

It should be noted that, due to the constraint relationship, the modules in the system can ensure a complete correct response.

On the basis of the above embodiments, the embodiments of the present invention are the same as the above embodimentsThe phases of the first timing control signal, the second timing control signal, and the third timing control signal will be specifically described. That is, the first timing control signal is the third timing control signal delayed by T_d1Obtaining that the second time sequence control signal is the third time sequence control signal delay T_d2To obtain a mixture of, among others,

T_p＜T_d2＜T_s；

wherein, T_pWidth, T, of said biphasic pulse excitation signal_sIs the period.

On the basis of the foregoing embodiments, the embodiments of the present invention specifically describe the primary delay signal of the first timing control signal and the secondary delay signal of the first timing control signal in the foregoing embodiments, that is, the primary delay signal of the first timing control signal is the first timing signal delay T_pAnd/2 obtaining that the secondary delay signal of the first time sequence control signal is the first time sequence signal delay T_pThus obtaining the product.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will 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; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.