阅读说明：本技术 接收机双环路自动增益控制方法、电子设备、介质及装置 (Receiver double-loop automatic gain control method, electronic equipment, medium and device ) 是由 许智宁 王日炎 周伶俐 贺黉胤 张芳芳 于 2019-07-16 设计创作，主要内容包括：本发明提供接收机双环路自动增益控制方法,包括步骤：信号幅度检测,将第二增益受控放大电路生成的放大信号转换成数字信号,将数字信号的幅度与目标值进行比较,根据比较结果调整第一增益受控放大电路、第二增益受控放大电路的增益值；带内信号检测,检测第二增益受控放大电路的低频信号是否饱和,是则降低第二增益受控放大电路的增益值；带外信号检测,检测第一增益受控放大电路的高频信号是否饱和,是则降低第一增益受控放大电路的增益值。本发明涉及接收机双环路自动增益控制装置、电子设备与存储介质。本发明相比于单环AGC控制模式,能够更好地保持信号完整,能够精确并快速地控制增益。(The invention provides a receiver double-loop automatic gain control method, which comprises the following steps: detecting signal amplitude, converting the amplified signal generated by the second gain controlled amplifying circuit into a digital signal, comparing the amplitude of the digital signal with a target value, and adjusting the gain values of the first gain controlled amplifying circuit and the second gain controlled amplifying circuit according to the comparison result; detecting an in-band signal, namely detecting whether a low-frequency signal of the second gain controlled amplifying circuit is saturated or not, and if so, reducing the gain value of the second gain controlled amplifying circuit; and detecting out-of-band signals, namely detecting whether the high-frequency signals of the first gain controlled amplifying circuit are saturated or not, and if so, reducing the gain value of the first gain controlled amplifying circuit. The invention relates to a receiver double-loop automatic gain control device, an electronic device and a storage medium. Compared with a single-loop AGC control mode, the method can better keep the signal integrity and can accurately and quickly control the gain.)

1. The double-loop automatic gain control method of the receiver is characterized by comprising the following steps:

The signal amplitude detection is to convert the amplified signal generated by the second gain controlled amplifying circuit into a digital signal, compare the amplitude of the digital signal with a target value, and adjust the gain values of the first gain controlled amplifying circuit and the second gain controlled amplifying circuit according to the comparison result;

Detecting an in-band signal, namely detecting whether a low-frequency signal of the second gain controlled amplifying circuit is saturated or not, and if so, reducing a gain value of the second gain controlled amplifying circuit;

And detecting out-of-band signals, namely detecting whether the high-frequency signals of the first gain controlled amplifying circuit are saturated or not, and if so, reducing the gain value of the first gain controlled amplifying circuit.

2. the receiver dual-loop automatic gain control method of claim 1, wherein: in the signal amplitude detection step, if the amplitude of the digital signal is smaller than the target value, the gain values of the first gain-controlled amplification circuit and the second gain-controlled amplification circuit are simultaneously increased until the gain value of the first gain-controlled amplification circuit or the second gain-controlled amplification circuit is finely adjusted when the amplitude of the digital signal is within the error threshold range of the target value; if the amplitude of the digital signal is larger than the target value, reducing the gain values of the first gain-controlled amplifying circuit and the second gain-controlled amplifying circuit at the same time until the gain value of the first gain-controlled amplifying circuit or the second gain-controlled amplifying circuit is finely adjusted when the amplitude of the digital signal is within the error threshold range of the target value; if the amplitude of the digital signal is equal to the target value, judging whether the high-frequency signal of the first gain controlled amplifying circuit or the low-frequency signal of the second gain controlled amplifying circuit is saturated, if so, reducing the gain value of the circuit with the saturated signal, and simultaneously increasing the gain value of the circuit with the unsaturated signal, wherein the reduced gain value of the circuit with the saturated signal is equal to the increased gain value of the circuit with the unsaturated signal.

3. The receiver dual-loop automatic gain control method of claim 1, wherein: in the signal amplitude detecting step, if the gain of the first gain-controlled amplifying circuit or the second gain-controlled amplifying circuit is a specified value, the gain of the circuit whose gain value is not specified is configured according to the target value and the specified value.

4. An electronic device, characterized by comprising: a processor;

A memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising instructions for carrying out the method of any one of claims 1-3.

5. A computer-readable storage medium having stored thereon a computer program, characterized in that: the computer program is executed by a processor for performing the method according to any of claims 1-3.

6. Receiver dual loop automatic gain control device which characterized in that: the receiver comprises a first gain controlled amplification circuit, a second gain controlled amplification circuit and a gain control circuit, wherein the input end of the first gain controlled amplification circuit is connected with the signal input end of the receiver, the gain output end of the first gain controlled amplification circuit is connected with the input end of the second gain controlled amplification circuit, the detection output end of the first gain controlled amplification circuit is connected with the control input end of the gain control circuit, the output end of the second gain controlled amplification circuit is connected with the signal input end of the gain control circuit, and the output end of the gain control circuit is connected with the gain control end of the first gain controlled amplification circuit and the gain control end of the second gain controlled amplification circuit.

7. The receiver dual-loop automatic gain control device of claim 6, wherein: the first gain controlled amplifying circuit is composed of a plurality of amplifiers and a detector, the amplifiers are sequentially connected, the input end of a first amplifier in the first gain controlled amplifying circuit is connected with the signal input end of the receiver, the output end of a last amplifier in the first gain controlled amplifying circuit is connected with the input end of the detector and the input end of the second gain controlled amplifying circuit, the output end of the detector is connected with the control input end of the gain control circuit, and the output end of the gain control circuit is connected with the gain control ends of the amplifiers in the first gain controlled amplifying circuit.

8. The receiver dual-loop automatic gain control device of claim 7, wherein: the second gain controlled amplifying circuit is composed of a low-pass filter and an amplifier, wherein the input end of the low-pass filter is connected with the output end of the last amplifier in the first gain controlled amplifying circuit, the output end of the low-pass filter is connected with the input end of the amplifier of the second gain controlled amplifying circuit, the output end of the amplifier of the second gain controlled amplifying circuit is connected with the signal input end of the gain control circuit, and the output end of the gain control circuit is connected with the gain control end of the amplifier in the second gain controlled amplifying circuit.

9. the receiver dual-loop automatic gain control device of claim 8, wherein: the gain control circuit is composed of an analog-to-digital converter and a digital part of an AGC system, the input end of the analog-to-digital converter is connected with the output end of an amplifier in the second gain-controlled amplifying circuit, the output end of the analog-to-digital converter is connected with the input end of the digital part of the AGC system, the output end of the digital part of the AGC system is connected with the gain control ends of amplifiers in the first gain-controlled amplifying circuit and the second gain-controlled amplifying circuit, and the control input end of the digital part of the AGC system is connected with the output end of the detector.

10. The receiver dual-loop automatic gain control device of claim 7, wherein: the number of amplifiers in the first gain-controlled amplification circuit is two.

Technical Field

The invention relates to the technical field of baseband integrated circuit gain automatic control, in particular to a receiver double-loop automatic gain control method, electronic equipment, a medium and a device.

Background

In a communication signal transmission system, the size of a received signal may vary greatly due to different reception environments or due to external interference, device aging, and the like. When the input signal is weak, data may not be processed well, and when the input signal is strong, the signal enters a saturation region or a cut-off region, which causes severe distortion of the signal, and the signal is cut off, so that a good signal cannot be obtained.

at present, the signal strength is controlled by automatic gain control, which is an automatic control circuit that automatically keeps the amplitude of the output signal to change in a small range under the condition of the amplitude change of the input signal. When the amplitude of the input signal varies in a large range, the agc (automatic Gain control) system can adaptively change the Gain so that the amplitude of the output signal of the receiver remains the same or varies a little. The existing automatic gain control is single-loop AGC control, and in the single-loop AGC control method, signals cannot be kept complete and the signal gain cannot be well controlled.

disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a receiver double-loop automatic gain control method, which solves the problems that in the existing single-loop AGC control method, signals cannot be kept complete and signal gain cannot be well controlled.

the invention provides a receiver double-loop automatic gain control method, which comprises the following steps:

The signal amplitude detection is to convert the amplified signal generated by the second gain controlled amplifying circuit into a digital signal, compare the amplitude of the digital signal with a target value, and adjust the gain values of the first gain controlled amplifying circuit and the second gain controlled amplifying circuit according to the comparison result;

Detecting an in-band signal, namely detecting whether a low-frequency signal of the second gain controlled amplifying circuit is saturated or not, and if so, reducing a gain value of the second gain controlled amplifying circuit;

And detecting out-of-band signals, namely detecting whether the high-frequency signals of the first gain controlled amplifying circuit are saturated or not, and if so, reducing the gain value of the first gain controlled amplifying circuit.

Further, in the signal amplitude detection step, if the amplitude of the digital signal is smaller than the target value, the gain values of the first gain-controlled amplification circuit and the second gain-controlled amplification circuit are simultaneously increased until the gain value of the first gain-controlled amplification circuit or the second gain-controlled amplification circuit is finely adjusted when the amplitude of the digital signal is within the error threshold range of the target value; if the amplitude of the digital signal is larger than the target value, reducing the gain values of the first gain-controlled amplifying circuit and the second gain-controlled amplifying circuit at the same time until the gain value of the first gain-controlled amplifying circuit or the second gain-controlled amplifying circuit is finely adjusted when the amplitude of the digital signal is within the error threshold range of the target value; if the amplitude of the digital signal is equal to the target value, judging whether the high-frequency signal of the first gain controlled amplifying circuit or the low-frequency signal of the second gain controlled amplifying circuit is saturated, if so, reducing the gain value of the circuit with the saturated signal, and simultaneously increasing the gain value of the circuit with the unsaturated signal, wherein the reduced gain value of the circuit with the saturated signal is equal to the increased gain value of the circuit with the unsaturated signal.

further, in the signal amplitude detecting step, if the gain of the first gain-controlled amplifying circuit or the second gain-controlled amplifying circuit is a specified value, the gain of the circuit whose gain value is not specified is configured according to the target value and the specified value.

an electronic device, comprising: a processor;

A memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising instructions for performing a receiver dual loop automatic gain control method.

A computer readable storage medium having stored thereon a computer program for execution by a processor of a receiver dual loop automatic gain control method.

The double-loop automatic gain control device of the receiver comprises a first gain controlled amplifying circuit, a second gain controlled amplifying circuit and a gain control circuit, wherein the input end of the first gain controlled amplifying circuit is connected with the signal input end of the receiver, the gain output end of the first gain controlled amplifying circuit is connected with the input end of the second gain controlled amplifying circuit, the detection output end of the first gain controlled amplifying circuit is connected with the control input end of the gain control circuit, the output end of the second gain controlled amplifying circuit is connected with the signal input end of the gain control circuit, and the output end of the gain control circuit is connected with the gain control end of the first gain controlled amplifying circuit and the gain control end of the second gain controlled amplifying circuit.

further, the first gain controlled amplifying circuit is composed of a plurality of amplifiers and a detector, the amplifiers are connected in sequence, the input end of a first amplifier in the first gain controlled amplifying circuit is connected with the signal input end of the receiver, the output end of a last amplifier in the first gain controlled amplifying circuit is connected with the input end of the detector and the input end of the second gain controlled amplifying circuit, the output end of the detector is connected with the control input end of the gain control circuit, and the output end of the gain control circuit is connected with the gain control ends of the amplifiers in the first gain controlled amplifying circuit.

Further, the second gain-controlled amplifying circuit is composed of a low-pass filter and an amplifier, an input end of the low-pass filter is connected with an output end of a last amplifier in the first gain-controlled amplifying circuit, an output end of the low-pass filter is connected with an input end of an amplifier of the second gain-controlled amplifying circuit, an output end of the amplifier of the second gain-controlled amplifying circuit is connected with a signal input end of the gain control circuit, and an output end of the gain control circuit is connected with a gain control end of an amplifier in the second gain-controlled amplifying circuit.

Furthermore, the gain control circuit is composed of an analog-to-digital converter and a digital part of the AGC system, an input end of the analog-to-digital converter is connected with an output end of an amplifier in the second gain-controlled amplifying circuit, an output end of the analog-to-digital converter is connected with an input end of the digital part of the AGC system, an output end of the digital part of the AGC system is connected with gain control ends of amplifiers in the first gain-controlled amplifying circuit and the second gain-controlled amplifying circuit, and a control input end of the digital part of the AGC system is connected with an output end of the detector.

further, the number of amplifiers in the first gain-controlled amplification circuit is two.

Compared with the prior art, the invention has the beneficial effects that:

The invention provides a receiver double-loop automatic gain control method, which comprises the following steps: detecting signal amplitude, converting the amplified signal generated by the second gain controlled amplifying circuit into a digital signal, comparing the amplitude of the digital signal with a target value, and adjusting the gain values of the first gain controlled amplifying circuit and the second gain controlled amplifying circuit according to the comparison result; detecting an in-band signal, namely detecting whether a low-frequency signal of the second gain controlled amplifying circuit is saturated or not, and if so, reducing the gain value of the second gain controlled amplifying circuit; and detecting out-of-band signals, namely detecting whether the high-frequency signals of the first gain controlled amplifying circuit are saturated or not, and if so, reducing the gain value of the first gain controlled amplifying circuit. The invention relates to a receiver double-loop automatic gain control device. The invention also relates to an electronic device and a readable storage medium for performing a receiver dual loop automatic gain control method. Compared with a single-ring AGC control mode, the method can better keep the signal integrity, solves the problems that when an input signal is stronger, the signal enters a saturation region or a cut-off region, so that the signal is seriously distorted, and is cut off, so that a good signal cannot be obtained, and can accurately and quickly control the gain.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic diagram of a dual-loop automatic gain control apparatus of a receiver according to the present invention;

FIG. 2 is a flow chart of a receiver dual loop automatic gain control method of the present invention;

Fig. 3 is a flowchart of signal amplitude detection steps according to an embodiment of the present invention.

Detailed Description

the present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

a double-loop automatic gain control device of a receiver is shown in figure 1 and comprises a first gain controlled amplifying circuit, a second gain controlled amplifying circuit and a gain control circuit, wherein the input end of the first gain controlled amplifying circuit is connected with the signal input end of the receiver, the gain output end of the first gain controlled amplifying circuit is connected with the input end of the second gain controlled amplifying circuit, the detection output end of the first gain controlled amplifying circuit is connected with the control input end of the gain control circuit, the output end of the second gain controlled amplifying circuit is connected with the signal input end of the gain control circuit, and the output end of the gain control circuit is connected with the gain control end of the first gain controlled amplifying circuit and the gain control end of the second gain controlled amplifying circuit. The first gain controlled amplifying circuit is used for gain amplification and gain detection, the gain detection result is fed back to the gain control circuit, and the gain of the first gain controlled amplifying circuit is controlled by the gain control circuit; the second gain controlled amplifying circuit is used for filtering out the signal out-of-band interference part of the first gain controlled amplifying circuit and carrying out gain amplification, and the gain of the second gain controlled amplifying circuit is controlled by the gain control circuit; the gain control circuit is used for converting the signal of the second gain controlled amplifying circuit into a digital signal, detecting whether the digital signal reaches a target value or not, and adjusting the gains of the first gain controlled amplifying circuit and the second gain controlled amplifying circuit according to the detection result.

As shown in fig. 1, the first gain-controlled amplifying circuit preferably includes a plurality of amplifiers and detectors, and performs gain amplification of signals by the amplifiers and gain detection by the detectors. The plurality of amplifiers are connected in sequence, the input end of a first amplifier in the first gain controlled amplifying circuit is connected with the signal input end of the receiver, the output end of a last amplifier in the first gain controlled amplifying circuit is connected with the input end of the detector and the input end of the second gain controlled amplifying circuit, the output end of the detector is connected with the control input end of the gain control circuit, and the output end of the gain control circuit is connected with the gain control ends of the plurality of amplifiers in the first gain controlled amplifying circuit. Preferably, the number of amplifiers in the first gain-controlled amplification circuit is two.

As shown in fig. 1, the second gain-controlled amplifying circuit preferably comprises a low-pass Filter (Filter in fig. 1) and an amplifier, wherein the low-pass Filter filters out an out-of-band interference part of the signal, and the amplifier performs gain amplification. The input end of the low-pass filter is connected with the output end of the last amplifier in the first gain-controlled amplifying circuit, the output end of the low-pass filter is connected with the input end of the amplifier of the second gain-controlled amplifying circuit, the output end of the amplifier of the second gain-controlled amplifying circuit is connected with the signal input end of the gain control circuit, and the output end of the gain control circuit is connected with the gain control end of the amplifier in the second gain-controlled amplifying circuit.

As shown in fig. 1, the gain control circuit preferably includes an analog-to-digital converter (ADC in fig. 1) and a digital part (AGC digital in fig. 1) of the AGC system, converts an analog signal of the second gain-controlled amplification circuit into a digital signal by the analog-to-digital converter, inputs the digital signal into the digital part, detects whether the digital signal reaches a target value, and controls the gains of the amplifiers in the first gain-controlled amplification circuit and the second gain-controlled amplification circuit according to the detection result. The input end of the analog-to-digital converter is connected with the output end of the amplifier in the second gain controlled amplifying circuit, the output end of the analog-to-digital converter is connected with the input end of the digital part of the AGC system, the output end of the digital part of the AGC system is connected with the gain control ends of the amplifiers in the first gain controlled amplifying circuit and the second gain controlled amplifying circuit, and the control input end of the digital part of the AGC system is connected with the output end of the detector. The first gain controlled amplifying circuit feeds back the whole signal power to the digital part, and the digital part feeds back a control gain value to control the gain of the analog end in a logic operation or logic table look-up mode, controls the gain value through the digital part and adjusts the whole signal size; the signal output by the first gain controlled amplifying circuit is subjected to high-frequency noise removal through a low-pass filter of a second gain controlled amplifying circuit, the magnitude of a gain control signal is adjusted through an amplifier of the second gain controlled amplifying circuit, and the amplified signal enters an analog-to-digital converter of the gain control circuit for quantization processing; the analog-to-digital converter of the gain control circuit converts the signal output by the second gain controlled amplifying circuit into a digital signal, the digital part performs amplitude detection on the quantized data, obtains a control gain value through algorithm operation, and feeds the control gain value back to the first gain controlled amplifying circuit and the second gain controlled amplifying circuit for gain adjustment.

A receiver dual-loop automatic gain control method, as shown in fig. 2, includes the following steps:

signal amplitude detection, namely converting an amplification signal generated by the second gain controlled amplification circuit into a digital signal through an analog-to-digital converter of the gain control circuit, comparing the amplitude of the digital signal with a target value through a digital part of an AGC system in the gain control circuit, and adjusting the gain values of the first gain controlled amplification circuit and the second gain controlled amplification circuit according to a comparison result;

In-band signal detection, because a part of high-frequency signals are filtered after a signal output to a second gain-controlled amplifying circuit by a first gain-controlled amplifying circuit passes through a low-pass filter, whether low-frequency signals of the second gain-controlled amplifying circuit are saturated or not needs to be detected, and if yes, the gain value of the second gain-controlled amplifying circuit is reduced; the gain value of the second gain controlled amplification circuit is controlled by the digital part of the AGC system in the gain control circuit.

And detecting out-of-band signals, wherein a part of high-frequency signals are filtered out after the signals output to the second gain-controlled amplifying circuit by the first gain-controlled amplifying circuit pass through the low-pass filter, and the gain control circuit cannot directly detect whether the out-of-band signals of the second gain-controlled amplifying circuit are saturated, so that when the signals of the first gain-controlled amplifying circuit are fed back to the digital part of the gain control circuit, the digital part detects whether the high-frequency signals of the first gain-controlled amplifying circuit are saturated, and if so, the gain value of the first gain-controlled amplifying circuit is reduced until the high-frequency signals of the first gain-controlled amplifying circuit are no longer saturated, and meanwhile, the gain value of the second gain-controlled amplifying circuit is continuously and correspondingly changed to achieve balance.

As shown in fig. 3, in the signal amplitude detecting step, preferably, if the amplitude of the digital signal is smaller than the target value, the gain values of the first gain-controlled amplifying circuit and the second gain-controlled amplifying circuit are simultaneously increased until the gain value of the first gain-controlled amplifying circuit or the second gain-controlled amplifying circuit is finely adjusted when the amplitude of the digital signal is within the error threshold range of the target value; if the amplitude of the digital signal is larger than the target value, the gain values of the first gain controlled amplifying circuit and the second gain controlled amplifying circuit are reduced at the same time until the gain value of the first gain controlled amplifying circuit or the second gain controlled amplifying circuit is finely adjusted when the amplitude of the digital signal is within the error threshold range of the target value; if the amplitude of the digital signal is equal to the target value, whether the high-frequency signal of the first gain controlled amplifying circuit or the low-frequency signal of the second gain controlled amplifying circuit is saturated or not is judged, if yes, the gain value of the circuit with the saturated signal is reduced, meanwhile, the gain value of the circuit with the unsaturated signal is increased, and the gain value reduced by the circuit with the saturated signal is equal to the gain value increased by the circuit with the unsaturated signal. Such as: the overall target value is 0db, the gain value of the first gain controlled amplifying circuit is reduced by 3db due to the saturation of the high-frequency signal of the first gain controlled amplifying circuit, the gain value of the second gain controlled amplifying circuit is increased by 3db, then the gain value of the second gain controlled amplifying circuit is finely adjusted, and the signal can reach the target value, so that the signal can be quickly stabilized, when the gain value of one loop is increased or reduced, the other loop can immediately perform corresponding processing by referring to the increase or reduction of the current loop, compared with an independent loop, the combined loop can react faster and can reach the target value faster.

In one embodiment, in the signal amplitude detecting step, if the gain of the first gain-controlled amplifier circuit or the second gain-controlled amplifier circuit is a specified value, the gain of the circuit whose gain value is not specified is configured according to the target value and the specified value. Such as: when the high-frequency signal of the first gain controlled amplifying circuit is saturated, the gain value of the first gain controlled amplifying circuit is directly configured to-6 db, the required signal is still kept at the target value of 0db, the gain value of the second gain controlled amplifying circuit is directly configured to 6db, the gain is not required to be adjusted step by step, and only fine adjustment is needed after the gain value of the second gain controlled amplifying circuit is configured, so that the AGC loop response can be completed more quickly.

An electronic device, comprising: a processor;

A memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising instructions for performing a receiver dual loop automatic gain control method.

A computer readable storage medium having stored thereon a computer program for execution by a processor of a receiver dual loop automatic gain control method.

The invention provides a receiver double-loop automatic gain control method, which comprises the following steps: detecting signal amplitude, converting the amplified signal generated by the second gain controlled amplifying circuit into a digital signal, comparing the amplitude of the digital signal with a target value, and adjusting the gain values of the first gain controlled amplifying circuit and the second gain controlled amplifying circuit according to the comparison result; detecting an in-band signal, namely detecting whether a low-frequency signal of the second gain controlled amplifying circuit is saturated or not, and if so, reducing the gain value of the second gain controlled amplifying circuit; and detecting out-of-band signals, namely detecting whether the high-frequency signals of the first gain controlled amplifying circuit are saturated or not, and if so, reducing the gain value of the first gain controlled amplifying circuit. The invention relates to a receiver double-loop automatic gain control device. The invention also relates to an electronic device and a readable storage medium for performing a receiver dual loop automatic gain control method. Compared with a single-ring AGC control mode, the method can better keep the signal integrity, solves the problems that when an input signal is stronger, the signal enters a saturation region or a cut-off region, so that the signal is seriously distorted, and is cut off, so that a good signal cannot be obtained, and can accurately and quickly control the gain.

The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art can readily practice the invention as shown and described in the drawings and detailed description herein; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.