Signal windowing circuit, signal interference device, and signal windowing method

Abstract

A signal windowing circuit, a signal interference device, and a signal windowing method. The signal windowing circuit comprises a signal generation module, a frequency regulation module and a windowing module, wherein the signal generation module is used for outputting a voltage signal, the voltage value of which changes at a constant speed; the frequency regulation module is connected to the signal generation module, and is used for outputting an electrical signal in a corresponding frequency on the basis of the voltage value of the voltage signal; and the windowing module is connected to the signal generation module and the frequency regulation module, and is used for not outputting, when determining that the voltage value of the voltage signal is within a voltage range corresponding to a preset windowing frequency band, an electrical signal in the windowing frequency band.

Description

Signal windowing circuit, signal interference equipment and signal windowing method

[0001] This application claims priority to Chinese patent applications filed on November 8, 2024, with application number 2024115937275, entitled "Host of Frequency Jammer and Frequency Jammer"; and filed on November 6, 2025, with application number 2025116201456, entitled "Signal Windowing Circuit, Signal Jamming Device and Signal Windowing Method", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to a signal windowing circuit, a signal jamming device, and a signal windowing method. Background Technology

[0003] A frequency jammer is a device that generates interference signals at a specific frequency or frequency range to interfere with or block the signal transmission of unauthorized communication devices. For example, frequency jammers can be used in confidential locations, such as military training sites, confidential conference venues, or examination venues, to shield signals.

[0004] However, ensuring that the frequency jammer does not interfere with communication equipment on specific frequency bands (such as communication equipment used by the user or other legitimate communication equipment) during operation is an urgent problem to be solved. Summary of the Invention

[0005] Therefore, it is necessary to provide a signal windowing circuit, a signal interference device, and a signal windowing method.

[0006] A signal windowing circuit includes a signal generation module, a frequency adjustment module, and a windowing module. The signal generation module outputs a voltage signal whose voltage value changes at a uniform rate. The frequency adjustment module is connected to the signal generation module and outputs an electrical signal of a corresponding frequency to the windowing module based on the voltage value of the voltage signal. The windowing module is connected to both the signal generation module and the frequency adjustment module and does not output an electrical signal of the windowing frequency band when it determines that the voltage value of the voltage signal is within a voltage range corresponding to a preset windowing frequency band.

[0007] A signal jamming device includes a signal windowing circuit. The signal windowing circuit includes a signal generation module, a frequency adjustment module, and a windowing module. The signal generation module outputs a voltage signal with a uniformly varying voltage value. The frequency adjustment module is connected to the signal generation module and outputs an electrical signal of a corresponding frequency to the windowing module based on the voltage value of the voltage signal. The windowing module is connected to both the signal generation module and the frequency adjustment module and does not output an electrical signal within a preset windowing frequency band when it determines that the voltage value of the voltage signal falls within the voltage range corresponding to a preset windowing frequency band.

[0008] A signal windowing method includes: acquiring a voltage signal whose voltage value changes at a uniform rate; outputting an electrical signal of a corresponding frequency based on the voltage value of the voltage signal; and determining that when the voltage value of the voltage signal is within the voltage range corresponding to a preset windowing frequency band, not outputting an electrical signal of the windowing frequency band.

[0009] Details of one or more embodiments of this application are set forth in the following drawings and description. Other features, objects, and advantages of the invention will become apparent from the specification, drawings, and claims. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0011] Figure 1 is a schematic diagram of a module of the signal windowing circuit provided in an embodiment of this application;

[0012] Figures 2A and 2B are schematic diagrams of two waveforms of the voltage signal provided in the embodiments of this application;

[0013] Figures 3A and 3B are schematic diagrams of two waveforms of the electrical signal output by the frequency adjustment module provided in the embodiments of this application;

[0014] Figures 4A and 4B are schematic diagrams of the radio frequency signal output by the windowing module provided in the embodiments of this application under two different coordinate systems;

[0015] Figure 5 is a schematic diagram of one embodiment of the signal generation module in Figure 1;

[0016] Figure 6 is a schematic diagram of another embodiment of the signal generation module in Figure 1;

[0017] Figure 7 is a waveform diagram of the square wave signal provided in an embodiment of this application;

[0018] Figure 8 is a circuit diagram of one embodiment of the signal generation module shown in Figure 5;

[0019] Figure 9 is a schematic diagram of another embodiment of the signal generation module in Figure 1;

[0020] Figure 10 is a circuit diagram of one embodiment of the signal generation module in Figure 9;

[0021] Figure 11 is a schematic diagram of another embodiment of the signal generation module in Figure 1;

[0022] Figure 12 is a schematic diagram of one embodiment of the window opening module in Figure 1;

[0023] Figure 13 is a schematic diagram of a specific module of one embodiment of the signal windowing circuit shown in Figure 1;

[0024] Figure 14 is a circuit diagram of one embodiment of the signal windowing circuit shown in Figure 13;

[0025] Figure 15 is a signal timing diagram of one embodiment of the signal windowing circuit shown in Figures 13 and 14;

[0026] Figure 16 is a schematic diagram of another embodiment of the signal generation module in Figure 1;

[0027] Figure 17 is a schematic diagram of a module based on one embodiment of the signal windowing circuit in Figure 16;

[0028] Figure 18 is a schematic diagram of a specific module of one embodiment of the signal windowing circuit shown in Figure 17;

[0029] Figure 19 is a signal timing diagram and frequency domain diagram of one embodiment of the signal windowing circuit shown in Figure 18;

[0030] Figure 20 is a signal timing diagram of another embodiment of the signal windowing circuit shown in Figure 18;

[0031] Figure 21 is a schematic block diagram of a signal jamming device provided in an embodiment of this application;

[0032] Figure 22 is a schematic flowchart of one step of the signal windowing method provided in the embodiment of this application. Detailed Implementation

[0033] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," just as "comprising" is interpreted as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

[0036] It should also be noted that the methods disclosed in the embodiments of this application or the methods shown in the flowcharts include one or more steps for implementing the method. Without departing from the scope of the claims, the execution order of multiple steps can be interchanged, and some steps can also be deleted.

[0037] Frequency jammers interfere with illegal communication devices by emitting jamming signals, causing these devices to exhibit phenomena such as searching for networks, having no signal, or having no service, thereby interfering with or blocking the signal transmission of illegal communication devices.

[0038] Since legitimate electronic products (such as user-owned devices or other electronic equipment that does not require shielding) may exist within the affected area of ​​a frequency jammer, if the jammer remains on, the signals of these legitimate devices will also be blocked, preventing users from using them. Therefore, ensuring that the frequency jammer interferes with communication devices operating on specific frequency bands (such as user-owned devices or other legitimate communication devices) is a pressing issue. One possible solution is to "window" the jamming frequency band of the jammer. This means that when sweeping for interference, the jammer should not output an interference signal when it encounters the communication frequency band of a legitimate electronic product, but should output an interference signal only after sweeping past that band.

[0039] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0040] Figure 1 is a circuit diagram of one embodiment of the signal windowing circuit provided in this application. As shown in Figure 1, the signal windowing circuit 100 includes a signal generation module 110, a frequency adjustment module 120, and a windowing module 130. The signal generation module 110 outputs a voltage signal V1 whose voltage value changes at a uniform rate. The frequency adjustment module 120 is connected to the signal generation module 110 and outputs an electrical signal V2 of a corresponding frequency to the windowing module 130 based on the voltage value of the voltage signal V1. The windowing module 130 is connected to the signal generation module 110 and the frequency adjustment module 120, and it does not output the electrical signal V2 of the windowing frequency band when it determines that the voltage value of the voltage signal V1 is within the voltage range corresponding to a preset windowing frequency band.

[0041] It should be noted that a voltage signal V1 with a uniformly changing voltage value can include a voltage signal with a uniformly increasing voltage value or a voltage signal with a uniformly decreasing voltage value. A voltage signal with a uniformly increasing voltage value can be a voltage signal with a linear increase or a voltage signal with a step increase. Similarly, a voltage signal with a uniformly decreasing voltage value can be a voltage signal with a linear decrease or a voltage signal with a step decrease. The slopes of voltage signals with uniformly increasing and uniformly decreasing voltage values ​​can be opposite, but the absolute values ​​of the slopes can be the same.

[0042] For example, as shown in Figure 2A, a voltage signal V1 with a uniformly changing voltage value can include a voltage signal V1A with a linearly increasing voltage value and a voltage signal V1B with a linearly decreasing voltage value. Voltage signal V1A increases uniformly within 0-10 μs, and voltage signal V1B decreases uniformly within 10-20 μs. Voltage signals V1A and V1B can each be used individually as periodic signals to obtain voltage signal V1 (not shown in the figure). For example, voltage signal V1 may include multiple repeating cycles of voltage signal V1A. Alternatively, continuous voltage signals V1A and V1B can be combined as a periodic signal to form voltage signal V1 (as shown in Figure 2A), where only one cycle is shown.

[0043] Alternatively, as shown in Figure 2B, the voltage signal V1, whose voltage value changes at a uniform rate, can also include a voltage signal V1C with a step-increasing voltage value and a voltage signal V1D with a step-decreasing voltage value. Voltage signal V1C increases step-increasingly within 0-10 μs, and voltage signal V1D decreases step-increasingly within 10-20 μs. Voltage signals V1C and V1D can be used individually as periodic signals to obtain voltage signal V1 (not shown in the figure), or the continuous voltage signals V1C and V1D can be combined as a periodic signal to form voltage signal V1 (as shown in Figure 2B). Only one period is shown in Figure 2B.

[0044] It should be noted that the frequency adjustment module 120 can be a circuit module whose output frequency changes with the input voltage. The frequency adjustment module 120 receives a voltage signal V1 whose voltage value changes at a uniform rate. Because the voltage value of this signal V1 changes at a uniform rate, the frequency adjustment module 120 outputs an electrical signal V2 whose frequency changes uniformly. The frequency of this electrical signal V2 corresponds to the changing trend of the voltage value of its input voltage signal V1. For example, the larger the voltage value of the voltage signal V1 received by the frequency adjustment module 120, the higher the frequency of its output electrical signal V2. The smaller the voltage value of the voltage signal V1 received by the frequency adjustment module 120, the lower the frequency of its output electrical signal V2.

[0045] For example, as shown in Figure 3A, since the frequency of electrical signal V2 can correspond to the voltage value of its input voltage signal V1, if voltage signal V1 includes V1A and V1B as shown in Figure 2A, then electrical signal V2 can include electrical signal V2A with a linearly increasing frequency and electrical signal V2B with a linearly decreasing frequency. Electrical signal V2A increases at a constant frequency within 0-10 μs, and electrical signal V2B decreases at a constant frequency within 10-20 μs. Alternatively, as shown in Figure 3B, if voltage signal V1 includes V1C and V1D as shown in Figure 2B, electrical signal V2 can include electrical signal V2C with a stepped increasing frequency and electrical signal V2D with a stepped decreasing frequency. Electrical signal V2C increases at a stepped frequency within 0-10 μs, and electrical signal V2D decreases at a stepped frequency within 10-20 μs.

[0046] It should be noted that the windowing module 130 can detect the voltage value of the voltage signal V1 output by the signal generation module 110. Specifically, the detection method can be as follows: the windowing module 130 can directly detect the voltage value of the voltage signal V1 output by the signal generation module 110. Alternatively, the windowing module 130 can also detect the input signal received by the signal generation module 110 and calculate the current voltage value of the voltage signal V1 in real time based on the pre-stored working principle of the voltage generation module 110.

[0047] When the windowing module 130 determines that the voltage value of the voltage signal V1 is not within the voltage range corresponding to the preset windowing frequency band, it outputs an electrical signal V2 with a frequency corresponding to the voltage value of the voltage signal V1 transmitted by the frequency adjustment module 120. When the voltage value of the voltage signal V1 is within the voltage range corresponding to the preset windowing frequency band, it does not output the electrical signal V2 of the corresponding frequency transmitted by the frequency adjustment module 120.

[0048] It should be noted that the voltage range of voltage signal V1 includes the voltage range corresponding to the preset windowed frequency band; in other words, the signal frequency band corresponding to the voltage range of voltage signal V1 includes the preset windowed frequency band. Electrical signal V2 serves as a frequency sweep signal to achieve frequency sweeping of the corresponding frequency band.

[0049] For example, as shown in Figures 4A and 4B, assume that the frequency band corresponding to the electrical signal V2 is 100MHz-200MHz, and the preset windowing frequency band is 110MHz-180MHz. It should be noted that the radio frequency signal in Figures 4A and 4B refers to the signal output after the electrical signal V2 passes through the windowing module 130. Referring to Figures 2A, 3A, 4A, and 4B, when the voltage value of the voltage signal V1 is not within the voltage range corresponding to the preset windowing frequency band, i.e., the voltage value of V1A is less than max1 (corresponding to the time period 0-3μs), the corresponding frequency electrical signal V2 is output (at this time, the radio frequency signal is the electrical signal V2). When the voltage value of voltage signal V1A is determined to be within the voltage range corresponding to the preset windowing frequency band (i.e., the voltage value of V1A is greater than max1 and less than max2 within the time period of 3-7μs), the electrical signal V2 of the corresponding frequency transmitted by the frequency adjustment module 120 is not output. That is, no electrical signal between 110MHz and 180MHz is output (i.e., no RF signal is output within 110MHz-180MHz), thus achieving windowing. Next, the frequency of the output electrical signal V2 increases from 180MHz to 200MHz. The voltage value of voltage signal V1 is greater than max2 and less than max3, and is not within the voltage range corresponding to the preset windowing frequency band. The corresponding frequency electrical signal V2 is output (within the time period of 7-10μs). Afterward, the voltage value of voltage signal V1B begins to decrease from max3, and the frequency of electrical signal V2 also decreases accordingly (within the time period of 10-13μs). After the frequency of electrical signal V2 drops to 180MHz, the voltage value of voltage signal V1B falls back within the preset windowing frequency band, i.e., V1B is less than max2 and greater than max1 (corresponding to the time period 13-17μs). At this time, electrical signal V2 at the corresponding frequency is not output, and windowing is implemented again. After windowing ends, the voltage value of voltage signal V1B is no longer within the preset windowing frequency band, i.e., the voltage value of V1 is less than max1. Therefore, the frequency of the output electrical signal V2 continues to decrease from 110MHz to 100MHz (corresponding to the time period 17-20μs).

[0050] In this embodiment, when the voltage value of the voltage signal V1 (including V1A and V1B) is determined to be within the voltage range corresponding to a preset windowing frequency band, the electrical signal V2 of the windowing frequency band is not output, thereby achieving windowing of the frequency sweep signal. Similarly, for the voltage signal V1 shown in Figure 2B, which includes a voltage signal V1C with a step-increasing voltage value and a voltage signal V1D with a step-decreasing voltage value, windowing can also be achieved based on the same principle. Therefore, this embodiment can prevent the output of the electrical signal V2 of the windowing frequency band when the voltage value of the voltage signal V1 is within the voltage range corresponding to the windowing frequency band, thereby windowing the electrical signal V2 and avoiding interference to legitimate communication devices in a specific frequency band during the frequency sweep process.

[0051] Furthermore, the embodiments of this application can achieve windowing of a preset windowing frequency band based on the voltage value of the voltage signal V1, and accurately control the windowing timing of the electrical signal V2. Therefore, the windowing accuracy can be improved, thereby solving the problem that current windowing schemes are difficult to accurately control the windowing timing and have low windowing accuracy. At the same time, it can avoid interference with communication equipment in specific frequency bands, such as the preset windowing frequency band, during use.

[0052] In one embodiment, please refer to FIG5, which is a schematic diagram of a module of the signal generation module 110 provided in this application. As shown in FIG5, the signal generation module 110 includes a first arithmetic unit 113 and a second arithmetic unit 114. The first arithmetic unit 113 is used to receive a reference voltage signal Vc and a square wave signal V3 that varies in steps, and outputs a first signal with a constant current value according to the reference voltage signal Vc and the square wave signal V3. The second arithmetic unit 114 is connected to the first arithmetic unit 113, and the second arithmetic unit 114 is also connected to the frequency adjustment module 120. The second arithmetic unit 114 is used to output a voltage signal V1 whose voltage value changes uniformly to the value corresponding to each step voltage value of the square wave signal according to the first signal.

[0053] It should be noted that the voltage value of the reference voltage signal Vc can be a fixed value, and the reference voltage signal Vc can be set according to the actual situation. When the square wave signal V3 changes in steps, the first arithmetic unit 113 can accurately output a first signal with a constant current value, and the second arithmetic unit 114 can accurately output a voltage signal V1 with a uniformly changing step voltage value based on each step voltage value of the square wave signal V3. Specifically, the voltage signal V1 with a uniformly changing voltage value corresponding to each step voltage value of the square wave signal means that before each step voltage value (such as max1), the voltage value of the voltage signal V1 changes at a uniform rate, and after reaching a step voltage value, it will briefly maintain that step voltage value for a period of time, and then the voltage value will continue to change at a uniform rate until the next step voltage value is reached. As shown in Figure 2B, the voltage value increases at a constant speed before reaching the step voltage value max1. After reaching the step voltage value max1, it only lasts for a short period of time (i.e., 3-3.2μs), and then the voltage value continues to increase at a constant speed until it reaches the next step voltage value max2.

[0054] As shown in Figure 6, the signal generation module 110 may further include a second control module 111 and a first digital-to-analog converter module 112. The stepped square wave signal V3 can be output by the second control module 111 through controlling the first digital-to-analog converter module 112. For example, the second control module 111 outputs a voltage control command to the first digital-to-analog converter module 112, thereby controlling the first digital-to-analog converter module 112 to output the stepped square wave signal V3. The first digital-to-analog converter module 112 outputs the stepped square wave signal V3 to the first arithmetic unit 113. The first arithmetic unit 113 receives the reference voltage signal Vc and the stepped square wave signal V3, and outputs a first signal with a constant current value based on the reference voltage signal Vc and the square wave signal V3. The second arithmetic unit 114 outputs a voltage signal V1 whose voltage value changes uniformly to the value corresponding to each step of the square wave signal based on the first signal.

[0055] For example, as shown in Figure 7, the square wave signal V3 that changes in a stepped manner can include any of the following: a square wave signal V3A that rises in a stepped manner, a square wave signal V3B that falls in a stepped manner, a square wave signal V3C that rises in a stepped manner followed by a step-falling manner, and a square wave signal V3D that falls in a stepped manner followed by a step-rise. Figure 7 only shows one cycle of the square wave signal; the square wave signal changes in the same way in subsequent cycles, and will not be described in detail here.

[0056] In one embodiment, as shown in FIG8, the first operational unit 113 includes a first operational amplifier U1A, a first resistor R4, a second resistor R2, and a third resistor R3. The first input terminal of the first operational amplifier U1A (i.e., port 3 in FIG8) receives a square wave signal V3 through the third resistor R3. The first terminal of the first resistor R4 is used to receive a reference voltage signal Vc, and the second terminal of the first resistor R4 is connected to the second input terminal of the first operational amplifier U1A (i.e., port 2 in FIG8). The second resistor R2 is connected between the second input terminal and the output terminal (i.e., port 1 in FIG8) of the first operational amplifier U1A, and the output terminal of the first operational amplifier U1A is used to output a first signal.

[0057] It should be noted that, taking the operating voltage of the first operational unit 113 as 28V as an example, the current I1 = (28V - Vc) / (R2 + R4). The current I1 can be adjusted by changing the resistance value of R2 or R4, thereby changing the slope of the first signal and ultimately altering the frequency sweep speed. Therefore, the first resistor R4 and / or the second resistor R2 can be potentiometers, facilitating the adjustment of their resistance values.

[0058] In one embodiment, as shown in FIG8, the second operational unit 114 includes a second operational amplifier U1B, a fourth resistor R1, a fifth resistor R6, and a first capacitor C1. The first end of the fourth resistor R1 is used to receive a first signal, and the second end of the fourth resistor R1 is connected to the first input terminal of the second operational amplifier U1B (i.e., port 6 in FIG8). The second input terminal of the second operational amplifier U1B (i.e., port 5 in FIG8) is used to connect to a preset voltage source, such as 5V. The first end of the fifth resistor R6 is connected to the output terminal of the second operational amplifier U1B (i.e., port 7 in FIG8), and the second end of the fifth resistor R6 is connected to the first operational unit 113 (e.g., connected to the first input terminal of the first operational amplifier U1A). The first capacitor C1 is connected between the first input terminal and the output terminal of the second operational amplifier U1B, and the output terminal of the second operational amplifier U1B is used to output a voltage signal V1.

[0059] It should be noted that, taking the second operational unit 114 with an operating voltage of 28V and a preset voltage source of 5V as an example, the current I2 = (28-5) / R1, which is a negative current, opposite to the positive current I1 mentioned above. The resistance of R1 is relatively large, specifically in the MΩ range, so I2 is very small and can be ignored. Vc is a constant, and R2 and R4 are also constants, so the output current I = I1 + I2, and the output current I (i.e., the first signal) is a fixed value.

[0060] In this embodiment, the reference voltage signal Vc can be a stable and accurate voltage. Specifically, the signal windowing circuit 100 may further include a low-dropout linear regulator (LDO), which is connected to the first operational unit 113 and is used to output the reference voltage signal Vc. Using the LDO to provide the reference voltage signal Vc is advantageous because the voltage fluctuation generated by the LDO is small and the voltage is relatively stable; that is, the voltage does not change significantly with fluctuations in the power supply voltage, changes in the load current, or changes in the ambient temperature. Therefore, using the voltage generated by the LDO as a reference voltage can improve the stability of the output voltage signal V1. The more stable the voltage signal V1, the better it is for improving the accuracy of windowing. It is understood that the reference voltage signal Vc can also be provided by other devices (e.g., chips that generate small voltage fluctuations), but the provided reference voltage signal Vc must be stable. No limitation is placed on the device providing the reference voltage signal Vc here.

[0061] In one embodiment, FIG9 is a circuit diagram of another implementation of the signal generation module 110 provided in this application. As shown in FIG9, the signal generation module 110 includes a first negative feedback circuit 115, an integrator circuit 116, and a second negative feedback circuit 117. The first negative feedback circuit 115 is used to receive a reference voltage signal Vc and a square wave signal V3 that varies in steps, and outputs a first signal with a constant current value according to the reference voltage signal Vc and the square wave signal V3. The integrator circuit 116 is used to generate a voltage signal V1 with a voltage value that rises or falls at a uniform speed based on the first signal. The second negative feedback circuit 117 is used to control the amplitude of the voltage signal V1 to rise or fall to the value corresponding to each step voltage value of the square wave signal V3 according to the voltage value of the square wave signal V3.

[0062] It should be noted that the connection relationship between the first negative feedback circuit 115, the integrator circuit 116, and the second negative feedback circuit 117 can be determined according to the actual situation. In some cases, some components in the first negative feedback circuit 115, the integrator circuit 116, and the second negative feedback circuit 117 can be shared, thereby saving circuit costs.

[0063] For example, as shown in Figure 10, the signal generation module 110 includes a first operational amplifier U1A, a first resistor R4, a second resistor R2, a third resistor R3, a second operational amplifier U1B, a fourth resistor R1, a fifth resistor R6, and a first capacitor C1. The first input terminal of the first operational amplifier U1A (i.e., port 3 in Figure 10) receives a square wave signal V3 through the third resistor R3, and the second input terminal of the first operational amplifier U1A (i.e., port 2 in Figure 10) receives a reference voltage signal Vc through the first resistor R4. The second resistor R2 is connected between the second input terminal and the output terminal (i.e., port 1 in Figure 10) of the first operational amplifier U1A. The first input terminal of the second operational amplifier U1B is connected to the output terminal of the first operational amplifier U1A through the fourth resistor R1. The second input terminal of the second operational amplifier U1B (i.e., port 5 in Figure 10) is used to connect to a preset voltage source, and the output terminal of the second operational amplifier U1B (i.e., port 7 in Figure 10) is used to output a voltage signal V1. The fifth resistor R6 is connected between the output terminal of the second operational amplifier U1B and the first input terminal of the first operational amplifier U1A. The first capacitor C1 is connected between the first input terminal (i.e., port 6 in Figure 10) and the output terminal of the second operational amplifier U1B.

[0064] The operational amplifier U1A, the first resistor R4, and the second resistor R2 form the first negative feedback circuit 115. The operational amplifier U1B, the first capacitor C1, and the fourth resistor R1 form the integrating circuit 116. The third resistor R3, the fifth resistor R6, the first operational amplifier U1A, and the second operational amplifier U1B form the second negative feedback circuit 117. The square wave signal V3 received by the first operational amplifier U1A can be provided by a DAC (such as a digital-to-analog converter 112), that is, the input voltage is generated by the DAC.

[0065] It should be noted that the first resistor R4 can be a potentiometer, and the second resistor R2 can also be a potentiometer, thus facilitating the adjustment of their resistance values ​​and consequently changing the sweep frequency speed. The resistance value of the second resistor R2 can be greater than that of the first resistor R4, ensuring that the voltage value at port 2 remains stably equal to the reference voltage signal Vc, thereby improving the stability of the output voltage signal V1. The amplitude of the voltage signal V1 rises or falls to the value corresponding to each step voltage value of the square wave signal V3. For example, referring to Figures 2B and 7, if the step voltage value of the square wave signal V3D is U1, then the value of the voltage signal V1 corresponding to that step voltage value is max1, and the amplitude of the voltage signal V1 rises uniformly to max1 within the time period of 0-3μs.

[0066] It should be noted that, as shown in Figure 10, the first negative feedback circuit 115 is used to output a first signal with a constant current value (i.e., output current I, for details, refer to the corresponding content in Figure 8 above). The constant current of the first signal can make the slope of the voltage signal output by the integrator circuit 116 constant.

[0067] The working principle of the integrator circuit 116 is as follows: the voltage signal V1 output by the integrator circuit 116 depends on the charging and discharging of the first capacitor C1. That is, when the input voltage of the first negative feedback circuit 115 is a constant DC voltage, the voltage across the first capacitor C1 is zero at the initial moment (assuming the first capacitor C1 is not initially charged). As time goes on, the output current I charges the capacitor C1. The voltage across the first capacitor C1 (i.e., the voltage signal V1) will gradually increase. In this embodiment, in order to make the voltage signal a triangular wave signal, the input voltage is set to a changing signal, such as a square wave signal V3. During the high level of the square wave signal V3, the first capacitor C1 begins to charge, and the voltage of the voltage signal V1 gradually increases. When the square wave signal V3 becomes low, the first capacitor C1 begins to discharge, and the voltage of the voltage signal V1 gradually decreases. The voltage waveform of the voltage signal V1 is the integral waveform of the square wave signal V3. If the square wave signal is V3D as shown in Figure 7, the voltage signal V1 will have a triangular wave shape, as shown in Figure 2B.

[0068] The specific principle of voltage signal V1 is explained below: Taking the operating voltage of the second operational unit 114 as 28V as an example, the output voltage of the second operational amplifier U1B gradually changes as C1 charges. Before the voltage of voltage signal V1 reaches its maximum value (e.g., max1, max2, max3 in Figure 2B), the relationship between voltage signal V1 and time t is: Voltage signal V1 = (C1 / charging current) * t = {C1 / ((28-Vc) / (R2+R4))} * t. The charging current in this formula is the same as the output current I mentioned above. The output current I output by the first negative feedback circuit 115 powers the capacitor C1 in the integrator circuit 116. It can be seen that, since C1, the reference voltage signal Vc, R2, and R4 are all constant values, the part within {} is also a constant value, that is, the slope of the voltage signal V1 change is also a constant value, and the voltage signal V1 changes linearly with time. Therefore, the slope of the voltage signal V1 finally output by the integrator circuit 116 is constant during both the rise and fall.

[0069] Regarding the second negative feedback circuit 117, as shown in Figure 10, the second negative feedback circuit 117 can proportionally amplify the square wave signal V3, causing the voltage signal V1 to slowly rise or fall to a set voltage value MAX (for example, the voltage values ​​corresponding to the first and second frequency points of the windowing band, as shown in Figures max1 and max2), thus enabling windowing between any two frequency points. Since R1 is much larger than R2, I2 is negligible. Therefore, the set voltage value MAX of the voltage signal V1 is:

[0070] If R2 is much larger than R4, the maximum voltage signal V1 is approximately equal to the following formula:

[0071] This shows that MAX is a multiple of the square wave signal V3, thus allowing the square wave signal V3 to be amplified proportionally.

[0072] In summary, this embodiment of the application sets up a first negative feedback circuit 115 to output a stable current to the integrating circuit 116, and the integrating circuit 116 converts the square wave into a voltage signal V1 (e.g., a triangular wave) with a voltage value that rises or falls at a uniform rate. Since the input current of the integrating circuit 116 is a constant current, the charging speed of the capacitor is constant, and the slope of the final output voltage signal V1 is also stable. The voltage signal V1 output by the integrating circuit 116 generates an electrical signal V2 with a uniformly changing frequency through the frequency adjustment module 120, thereby achieving uniform frequency sweep to interfere with electronic devices in the environment, and in conjunction with the windowing module 130, it can achieve windowing between any two frequency points within the frequency band.

[0073] In one embodiment, as shown in FIG11, the signal windowing circuit 100 further includes a low-dropout linear regulator 118, which is connected to the first negative feedback circuit 115 (e.g., the second input terminal of the first operational amplifier U1A mentioned above) and is used to output a reference voltage signal Vc. The reference voltage signal Vc provides a stable and accurate reference voltage. For example, a low-dropout regulator (LDO) or other chips that generate small voltage fluctuations can be used to provide the reference voltage signal. The stable reference voltage will not change significantly with fluctuations in the power supply voltage, changes in the load current, or changes in the ambient temperature.

[0074] In one embodiment, the frequency adjustment module 120 includes a voltage-controlled oscillator (VCO). It should be noted that a voltage-controlled oscillator (VCO) is an electronic circuit whose output frequency varies with the input voltage. Its implementation principle is, for example, to change the resonant frequency of the oscillation circuit by controlling a variable capacitor element (such as a varactor diode) with the input voltage, thereby achieving the output of an electrical signal of the corresponding frequency.

[0075] In one embodiment, please refer to Figure 12, which is a circuit diagram of an embodiment of the windowing module 130 provided in this application. As shown in Figure 12, the windowing module 130 includes a switch module 131 and a first control module 113. The switch module 131 is connected to the frequency adjustment module 120. The switch module 131 outputs an electrical signal V2 in the on state and stops outputting the electrical signal V2 in the off state. Therefore, the radio frequency signal finally output by the switch module 131 is a signal other than the windowing frequency band of the electrical signal V2. The first control module 113 is connected to the switch module 131 and the signal generation module 110 respectively. The first control module 113 is used to control the switch module 131 to switch to the off state when it is determined that the voltage value of the voltage signal V1 reaches the voltage range corresponding to the preset windowing frequency band.

[0076] It should be noted that the switching module 131 may include a radio frequency switch, or other switching devices. The first control module 113 in the windowing module 130 may be shared with the second control module 111 in the signal generation module 110 shown in Figure 6, or they may be two different control modules. In this embodiment, the voltage range corresponding to the windowing frequency band is, for example, [max1, max2] as shown in Figure 2B. When the first control module 113 determines that the voltage signal V1 is in the range [max1, max2], it will disconnect the switching module 131, thereby realizing windowing. Therefore, this embodiment achieves the effect of precise windowing by adopting a cooperative approach between the first control module 113 and the switching module 131.

[0077] For example, the windowed frequency band includes a first frequency point, a second frequency point, and a frequency point between the first frequency point and the second frequency point. The second frequency point is greater than the first frequency point. When the electrical signal V2 sweeps from a low frequency to a high frequency, the first control module 113 is used to control the switch module 131 to switch to the off state when it is determined that the absolute value of the difference between the voltage value of the voltage signal V1 and the first voltage threshold corresponding to the first frequency point is less than a first preset difference, and to control the switch module 131 to switch to the on state when it is determined that the absolute value of the difference between the voltage value of the voltage signal V1 and the second voltage threshold corresponding to the second frequency point is less than a second preset difference.

[0078] It should be noted that, for example, if the windowed frequency band is 110MHz to 180MHz as shown in Figures 4A and 4B, then the first frequency point is 110MHz, the second frequency point is 180MHz, and the frequency points between the first and second frequency points are those between 110MHz and 180MHz. The first preset difference can be zero or a value close to zero, and the second preset difference can also be zero or a value close to zero. Assuming the windowing frequency band is 110MHz~180MHz, and the voltage signals V1 corresponding to 110MHz and 180MHz are max1 and max2 respectively, then when the electrical signal V2 sweeps from low frequency to high frequency (such as during the process of the electrical signal V2 sweeping from 100MHz to 110MHz), if the first control module 113 determines that the absolute value of the difference between the voltage value of voltage signal V1 and max1 is less than the first preset difference, then the control switch module 131 switches to the off state, thereby controlling the electrical signal V2 to stop outputting, and thus enters the windowing frequency band (the time period is 3μs~7μs), that is, stops outputting electrical signals.

[0079] For example, when the electrical signal V2 sweeps from high frequency to low frequency, the first control module 113 controls the switch module 131 to switch to the off state when the absolute value of the difference between the voltage value of the voltage signal V1 and the second voltage threshold corresponding to the second frequency point is less than the second preset difference, and controls the switch module 131 to switch to the on state when the absolute value of the difference between the voltage value of the voltage signal V1 and the first voltage threshold corresponding to the first frequency point is less than the first preset difference.

[0080] It should be noted that the second preset difference can also be zero or a value close to zero. Assuming the windowing frequency band is 110MHz to 180MHz, and the voltage signals V1 corresponding to 110MHz and 180MHz are max1 and max2 respectively, as shown in Figures 4A and 4B, when the electrical signal V2 sweeps from high frequency to low frequency (such as during the process of the electrical signal V2 sweeping from 200MHz to 180MHz), when the first control module 113 determines that the absolute value of the difference between the voltage value of voltage signal V1 and max2 is less than the second preset difference, it controls the switch module 131 to switch to the off state, and thus starts to enter another windowing frequency band (the time period is 13μs to 17μs), thereby controlling the electrical signal V2 to stop outputting.

[0081] In this embodiment, if the first preset difference and the second preset difference are non-zero, a certain amount of time can be reserved for the switching module 131 to ensure that the switching module 131 has completed the switching action when the windowing frequency band is reached.

[0082] If the first preset difference and the second preset difference are zero, then specifically: when the electrical signal V2 sweeps from low frequency to high frequency, the first control module 113 controls the switch module 131 to switch to the off state when it determines that the voltage value of the voltage signal V1 reaches the first voltage threshold corresponding to the first frequency point. And when it determines that the voltage value of the voltage signal V1 reaches the second voltage threshold corresponding to the second frequency point, it controls the switch module 131 to switch to the on state. When the electrical signal V2 sweeps from high frequency to low frequency, the first control module 113 controls the switch module 131 to switch to the off state when it determines that the voltage value of the voltage signal V1 reaches the second voltage threshold corresponding to the second frequency point, and controls the switch module 131 to switch to the on state when it determines that the voltage value of the voltage signal V1 reaches the first voltage threshold corresponding to the first frequency point. In this embodiment, the state of the switch module 131 is switched only after the voltage signal V1 reaches the voltage value corresponding to the windowing frequency band. This ensures that the time point when the switch module 131 is turned off can accurately correspond to the first frequency point of the windowing frequency band, and the time point when the switch module 131 is turned on can accurately correspond to the second frequency point of the windowing frequency band, thereby improving the accuracy of windowing.

[0083] In some examples, when the electrical signal V2 sweeps from a low frequency to a high frequency, the first control module 113 controls the switch module 131 to switch to an off state when it determines that the voltage value of the voltage signal V1 reaches a first voltage threshold corresponding to a first frequency point, and the signal generation module 110 continues to output the voltage signal V1 with a uniformly increasing voltage value when the switch module 131 is switched to the off state. The first control module 113 is also used to control the switch module 131 to switch to an on state when it determines that the voltage value of the voltage signal V1 reaches a second voltage threshold corresponding to a second frequency point, and the signal generation module 110 continues to output the voltage signal V1 with a uniformly increasing voltage value when the switch module 131 is switched to the on state.

[0084] It should be noted that when the electrical signal V2 sweeps from low frequency to high frequency, the control switch module 131 switches to the off state, indicating that the first control module 113 sends a control signal to the switch module 131. If a period of time is required from sending the control signal to the switch module 131 completely switching to the off state, the voltage signal V1 can remain unchanged during this period until the switch module 131 completely switches to the off state, at which point the signal generation module 110 starts outputting a voltage signal V1 with a uniformly increasing voltage value. At this time, since the switch module 131 is already off, the voltage signal V1 output by the signal generation module 110 continues to rise, but this will not affect the windowed frequency band. Furthermore, since the second frequency point of the windowed frequency band is higher than the first frequency point, that is, the voltage value corresponding to the second frequency point is greater than the voltage value of the first frequency point, the signal generation module 110 needs to continue outputting a voltage signal V1 with a uniformly increasing voltage value to reach the voltage value corresponding to the second frequency point.

[0085] Similarly, at the moment corresponding to the second frequency point, the control switch module 131 switches to the on state, indicating that the first control module 113 has sent a control signal to the switch module 131. If a period of time is required from sending the control signal to the switch module 131 completely switching to the on state, the voltage signal V1 can remain unchanged during this period until the switch module 131 completely switches to the on state, at which point the signal generation module 110 starts outputting the voltage signal V1 with a uniformly increasing voltage value. At this time, the signal generation module 110 continues to output the voltage signal V1 with a uniformly increasing voltage value, which gradually increases the frequency band of the electrical signal to interfere with signals outside the windowed frequency band.

[0086] In some examples, when the electrical signal V2 sweeps from a high frequency to a low frequency, the first control module 113 controls the switch module 131 to switch to the off state when it determines that the voltage value of the voltage signal V1 reaches the second voltage threshold corresponding to the second frequency point, and the signal generation module 110 continues to output the voltage signal V1 with a uniformly decreasing voltage value when the switch module 131 is switched to the off state. The first control module 113 is also used to control the switch module 131 to switch to the on state when it determines that the voltage value of the voltage signal V1 reaches the first voltage threshold corresponding to the first frequency point, and the signal generation module 110 continues to output the voltage signal V1 with a uniformly decreasing voltage value when the switch module 131 is switched to the on state.

[0087] It should be noted that when the electrical signal V2 sweeps from high frequency to low frequency, and the voltage value of the voltage signal V1 reaches the second voltage threshold corresponding to the second frequency point, the control switch module 131 switches to the off state, indicating that the first control module 113 sends a control signal to the switch module 131. If a period of time is required from sending the control signal to the switch module 131 completely switching to the off state, the voltage signal V1 can remain unchanged during this period until the switch module 131 completely switches to the off state, at which point the signal generation module 110 starts outputting the voltage signal V1 with a uniformly decreasing voltage value. At this time, since the switch module 131 is already off, the voltage signal V1 output by the signal generation module 110 continues to decrease, but it will not affect the windowed frequency band. Furthermore, since the first frequency point of the windowed frequency band is lower than the second frequency point, that is, the voltage value corresponding to the first frequency point is less than the voltage value of the second frequency point, the signal generation module 110 needs to continue outputting the voltage signal V1 with a uniformly decreasing voltage value to reach the voltage value corresponding to the first frequency point.

[0088] Similarly, upon reaching the first frequency point, the control switch module 131 switches to the ON state, indicating that the first control module 113 has sent a control signal to the switch module 131. If a period of time is required between sending the control signal and the switch module 131 fully switching to the ON state, the voltage signal V1 can remain unchanged during this period until the switch module 131 fully switches to the ON state. Then, the signal generation module 110 begins outputting a voltage signal V1 with a uniformly decreasing voltage value. At this time, the signal generation module 110 continues to output the voltage signal V1 with a uniformly decreasing voltage value, which gradually lowers the frequency band of the electrical signal to interfere with signals outside the windowed frequency band.

[0089] The following explanation, in conjunction with Figures 13 to 16 and the content of the above embodiments, will describe the overall working principle of a specific implementation of the signal windowing circuit 100.

[0090] Figures 13 and 14 are block diagrams and circuit diagrams of one embodiment of the signal windowing circuit 100. The first digital-to-analog converter module 112 is, for example, a DAC 1121 (as shown in Figure 18). The signal generation module 110 is, for example, a triangular wave generation circuit 1101, including a first arithmetic unit 113 and a second arithmetic unit 114 (as shown in Figures 8 and 14), or includes a first negative feedback circuit 115, an integrator circuit 116, and a second negative feedback circuit 117 (as shown in Figures 9 and 14). The frequency adjustment module 120 is, for example, a voltage-controlled oscillator 121. The switching module 131 in the windowing module 130 is, for example, an RF switch 132. The first control module 113 in the windowing module 130 and the second control module 111 in the signal generation module 110 share a processor 11; other embodiments may use different processors. Taking the output voltage of the triangular wave generation circuit 1101 (voltage signal V1), the radio frequency signal (RF signal V2 with added windowing function, i.e., the final output signal of the RF switch 132), and the input voltage of the triangular wave generation circuit 1101 (square wave signal V3) as an example, as shown in Figure 15, assuming the frequency sweep band is 100MHz-200MHz, and windowing is required between 110MHz-180MHz, where 110MHz is the first frequency point and 180MHz is the second frequency point. When the signal windowing circuit 100 starts working, the RF switch 132 is initially turned on, and the square wave signal V3 first outputs a voltage value U1. Based on this voltage U1, the triangular wave generation circuit 1101 outputs a voltage signal that rises along a fixed slope until it reaches max1 and remains unchanged. At this time, the voltage-controlled oscillator 121 also outputs an RF signal V2 with a uniformly rising frequency (at this time, the RF signal output is the same as the RF signal V2), until 110MHz. After processor 11 determines that voltage signal V1 reaches max1, i.e., when the frequency of electrical signal V2 increases to the first windowing frequency point (e.g., 110MHz), processor 11 sends a control signal to close RF switch 132 at a time point of 3μs, which is equivalent to the start of the first windowing. After a short buffer, at this time (3.2μs in the figure), RF switch 132 is completely closed, and the output of electrical signal V2 stops (i.e., there is no RF signal output at this time). At the same time, square wave signal V3 switches to U2, and voltage signal V1 increases at a constant rate. However, since RF switch 132 is in the closed state, it is still in the windowing frequency band, and electrical signal V2 will not be output. When voltage signal V1 increases to the voltage max2 corresponding to the second frequency point (e.g., 180MHz), RF switch 132 is controlled to open again (6.8μs in the figure). After a short buffer (7μs in the figure), electrical signal V2 continues to be output, and the frequency starts to rise from 180MHz. At the same time, square wave signal V3 switches to U3. Then the RF switch 132 remains in the ON state, and the voltage signal V1 rises at a constant speed until it reaches max3.Simultaneously, the frequency of the output electrical signal V2 also increases from 180MHz to 200MHz. This completes the first stage of frequency sweep (sweeping from low frequency to high frequency, i.e., 0-10μs in the figure).

[0091] Then the second stage of frequency sweeping is started (sweeping from high frequency to low frequency, i.e. 10-20μs in the figure). When the processor 11 determines that the voltage signal V1 rises to max3, it controls the square wave signal V3 to switch to U2 at 10μs. After that, the voltage signal V1 also decreases at a constant speed until max2, and the frequencies of the corresponding electrical signal V2 and the output RF signal also decrease at a constant speed until 180MHz. When the voltage signal V1 drops to max2, it remains unchanged. At this time, the frequency of the electrical signal V2 also drops to the frequency point of 180MHz (i.e., the second frequency point) that requires windowing. Then, the RF switch 132 is turned off (at 13μs in the figure). At this time, the second windowing stage is started. When the RF switch 132 is completely turned off (at 13.2μs in the figure), the electrical signal V2 is no longer output. At the same time, the square wave signal V3 switches to U1. Then, the voltage signal V1 drops at a constant speed until it reaches max1 (i.e., the voltage corresponding to the first frequency point). When it is determined that the voltage signal V1 has dropped to max1, the processor 11 controls the RF switch 132 to turn on (at 16.8μs in the figure). After a short buffer, the RF switch 132 is fully turned on. At this time, the electrical signal V2 continues to be output (at 17μs in the figure), and this cycle continues.

[0092] It should be noted that the voltage signal V1 must first reach the value corresponding to the endpoint of the windowing frequency band before the relevant actions to start or end windowing are executed. For example, when sweeping from a low frequency to a high frequency and about to enter the windowing stage, the voltage signal V1 must first reach the value corresponding to the first frequency point (e.g., when starting windowing for the 110MHz band, the voltage signal V1 must reach max1) before the RF switch 132 is turned off, thus initiating the second windowing frequency. Therefore, this solution ensures that the timing of the RF switch 132's opening and closing accurately corresponds to the two endpoints of the windowing frequency band, thereby improving the accuracy of windowing.

[0093] Next, another implementation of the signal windowing circuit 100 will be introduced. The only difference between this implementation and the above embodiments (including Figures 2 to 15) is the principle of the signal generation module 110. The working principles of the other modules (including the frequency adjustment module 120 and the windowing module 130) can be referred to the above embodiments.

[0094] In one embodiment, as shown in Figures 16 and 17, the signal generation module 110 includes a third control module 119 and a second digital-to-analog converter module 112b. The third control module 119 is connected to the second digital-to-analog converter module 112b, which is also connected to the frequency adjustment module 120. The third control module 119 is used to control the second digital-to-analog converter module 112b to output a voltage signal V1 whose voltage value rises or falls at a uniform rate.

[0095] The second digital-to-analog converter module 112b is used to output the voltage signal V1, whose voltage value rises or falls at a constant rate, to the frequency adjustment module 120. It should be noted that the third control module 111 may include a processor, which can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor. Understandably, the better the processor's performance and the faster its response speed, the faster the windowing rate of this solution. The second digital-to-analog converter module 112b may include a digital-to-analog converter, also known as a D / A converter, or simply a DAC.

[0096] For example, a voltage signal V1 with a uniformly increasing or decreasing voltage value, as shown in Figure 2A, can include voltage signals V1A and V1B, i.e., a triangular wave. In this embodiment, the third control module 119 controls the second digital-to-analog converter module 112b to generate the voltage signal V1, thereby driving the frequency adjustment module 120 to generate electrical signals V2 of different frequencies. Simultaneously, this is combined with the windowing module 130 to implement the windowing function. Electrical signal V2, for example, as shown in Figure 3A, can include electrical signals V2A and V2B. Since the second digital-to-analog converter module 112b can generate a voltage signal V1 with a constant slope, it can also cause the frequency adjustment module 120 to generate an electrical signal V2 with a uniformly changing frequency, thus enabling uniform frequency sweeping.

[0097] Specifically, the windowing module 130 is also connected to the third control module 119. If the windowing module 130, as shown in Figure 12 above, includes a switch module 131 and a first control module 113, then the first control module 113 and the third control module 119 in this embodiment can be the same module, or they can be two independent modules. If they are the same module, the third control module 119 is used to control the second digital-to-analog converter module 112 to output a voltage signal V1 whose voltage value rises or falls at a uniform speed, and is also used to control the switch module 131 to switch to the off state when it is determined that the voltage value of the voltage signal reaches the voltage range corresponding to the preset windowing frequency band. If they are two independent modules, the third control module 119 is connected to the first control module 113. The third control module 119 is used to control the second digital-to-analog converter module 112 to output a voltage signal V1 whose voltage value rises or falls at a uniform speed, and the third control module 119 is also used to send voltage value-related information of the voltage signal to the first control module 113. The first control module 113 determines, based on the voltage value information of the voltage signal, that when the voltage value of the voltage signal V1 reaches the voltage range corresponding to the preset windowing frequency band, the control switch module 131 switches to the off state. The voltage value information of the voltage signal V1 can be, for example, the voltage value of the voltage signal V1, or the initial voltage value of the voltage signal V1 and the variation pattern of the voltage signal V1.

[0098] Alternatively, in other embodiments, the windowing module 130 can be directly connected to the second digital-to-analog converter module 112b. In this case, the windowing module 130 directly determines in real time when to open the window based on the voltage signal output by the second digital-to-analog converter module 112b.

[0099] The following explanation, in conjunction with Figures 17 to 20, details one specific working principle of the signal windowing circuit 100.

[0100] Figure 18 is a specific module diagram of the signal windowing circuit 100. The third control module 111 in the signal generation module 110 is, for example, a processor 11; the second digital-to-analog converter module 112 is, for example, a DAC 1121; and the frequency adjustment module 120 is, for example, a voltage-controlled oscillator 121. The switching module 131 in the windowing module 130 is, for example, an RF switch 132. The first control module 113 in the windowing module 130 can share a processor with the third control module 111 in the signal generation module 110 (as shown in Figure 10), or they can be different processors. It should be noted that under the control of the processor 11, the DAC 1121 converts digital instructions into a linearly changing analog voltage (i.e., a triangular wave), and the voltage-controlled oscillator 121 generates a linearly changing electrical signal V2 based on the triangular wave. When performing the windowing function, taking a low-frequency to high-frequency sweep as an example, if the windowing function is directly implemented by causing a jump in the output voltage of the DAC1121 (e.g., from max1 directly to max2), after the voltage signal V1 reaches max1, the DAC1121 often requires a relatively long response time to control the voltage value V1 to change to max2 after receiving the digital instruction to jump to max2 from the processor. Therefore, the process of the DAC1121 output voltage value V1 rising steadily from its initial value to max1, then jumping from max1 to max2, and finally rising steadily from max2 to max3 takes longer than the process of the voltage value V1 rising steadily directly from its initial value to max3. The same principle applies to the process of sweeping from high frequency to low frequency. Therefore, in this embodiment, in order to maintain a good frequency sweep speed while ensuring the windowing function, the output electrical signal V2 is made to achieve the windowing function by setting the RF switch 132. The DAC1121 only needs to output a regular triangular wave normally, which saves the response time of the output voltage jump of the DAC1121, that is, shortens the time of the frequency sweep cycle.

[0101] The following explanation uses the example of a voltage signal V1 as the output voltage of the DAC and an RF signal V2 (i.e., the final output signal of the RF switch 132) with added windowing functionality. As shown in Figures 19 and 20, assume the frequency sweep band is 100MHz-200MHz, and windowing is required between 110MHz and 180MHz. Under the control of the processor 11, the DAC 1121 starts generating a triangular wave, i.e., the output voltage signal V1. Simultaneously, the voltage-controlled oscillator 121 generates an RF signal V2 with a gradually increasing frequency; at this point, the RF signal is the RF signal V2. When the voltage output by the DAC 1121 reaches max1 (which takes 3μs), the frequency of the RF signal V2 generated by the voltage-controlled oscillator 121 is 110MHz. The processor 11 then controls the RF switch 132 to open, initiating the windowing phase. This means that signals beyond 110MHz will not be output by the RF switch 132, i.e., the RF signal will not be output. During the windowing phase, the voltage signal V1 provided by DAC 1121 continuously rises until it reaches max2 (7μs). At this point, processor 11 controls RF switch 132 to turn on. At this time, the frequency of electrical signal V2 generated by voltage-controlled oscillator 121 is 180MHz, and electrical signal V2 at this frequency begins to be output normally through RF switch 132, thus ending the windowing phase of this cycle. The frequency of the output RF signal then increases to 200MHz, and then the voltage signal V1 decreases from max3, and the frequency of electrical signal V2 also decreases accordingly until it drops to 180MHz (13μs). Processor 11 then controls RF switch 132 to turn off again, and the windowing phase begins again. At the same time, the voltage signal V1 continues to decrease from max2 until it reaches max1 (17μs). Processor 11 then controls RF switch 132 to turn on, and at this time, RF signals from 110MHz to 100MHz can be output normally.

[0102] The signal windowing circuit 100 described in the above embodiment includes a signal generation module 110, a frequency adjustment module 120, and a windowing module 130. The signal generation module 110 outputs a voltage signal V1 with a uniformly changing voltage value. The frequency adjustment module 120 is connected to the signal generation module 110 and outputs an electrical signal V2 of the corresponding frequency based on the voltage value of the voltage signal V1. The windowing module 130 is connected to the signal generation module 110 and the frequency adjustment module 120. The windowing module 130 does not output the electrical signal V2 of the windowing frequency band when it determines that the voltage value of the voltage signal V1 is within the voltage range corresponding to a preset windowing frequency band. Therefore, the windowing frequency band can be accurately determined based on the voltage value of the voltage signal V1. When the voltage value of the voltage signal V1 is within the voltage range corresponding to the windowing frequency band, the electrical signal V2 of the windowing frequency band is not output, thereby windowing the frequency sweep signal. Thus, accurate windowing of the preset windowing frequency band can be achieved, thereby improving the windowing accuracy. At the same time, it can avoid interference with communication equipment in specific frequency bands, such as preset windowed frequency bands, during use.

[0103] Please refer to Figure 21, which is a schematic block diagram of a signal jamming device provided in an embodiment of this application.

[0104] As shown in Figure 21, the signal jamming device 200 includes the signal windowing circuit 210 described in the above embodiment. The signal windowing circuit 210 can be the signal windowing circuit 100 described in the above embodiment.

[0105] In one embodiment, the signal jamming device includes a frequency jammer. The frequency jammer can be used in confidential locations, such as military practice sites, confidential meeting venues, examination venues, or controlled areas, to block signals and prevent illegal communication devices such as mobile phones, various model remote controls, various wireless cheating tools, wireless microphones, cordless phones, walkie-talkies, and remote control devices (such as drones and unmanned vehicles) from functioning properly.

[0106] It is understood that the beneficial effects that the signal interference device provided in this application embodiment can achieve can be referred to the beneficial effects of the signal windowing circuit in the corresponding embodiment provided above, and will not be repeated here.

[0107] Please refer to Figure 22, which is a schematic flowchart of one step of the signal windowing method provided in the embodiment of this application.

[0108] As shown in Figure 22, the signal windowing method includes steps 301 to 303.

[0109] Step 301: Obtain a voltage signal whose voltage value changes at a constant rate.

[0110] The voltage signal V1, whose voltage value changes at a constant rate, can include a voltage signal whose voltage value increases at a constant rate and a voltage signal whose voltage value decreases at a constant rate. The slopes of the voltage signal whose voltage value increases at a constant rate and the voltage signal whose voltage value decreases at a constant rate can be opposite, but the absolute values ​​of the slopes can be the same.

[0111] In one embodiment, a voltage signal with a uniformly increasing voltage value and a voltage signal with a uniformly decreasing voltage value can be used separately as periodic signals to obtain a voltage signal V1, or the continuous voltage signals with a uniformly increasing voltage value and the voltage signals with a uniformly decreasing voltage value can be combined as a periodic signal to form the voltage signal V1.

[0112] In one embodiment, the voltage signal with a uniformly changing voltage value can be obtained by the signal generation module 110 in the aforementioned embodiment, which will not be described again here.

[0113] Step 302: Output an electrical signal of the corresponding frequency according to the voltage value of the voltage signal.

[0114] Because the voltage value of the voltage signal V1 changes at a constant rate, it can output an electrical signal V2 with a uniformly changing frequency. The frequency of this electrical signal V2 corresponds to the voltage value of its input voltage signal V1. For example, the larger the voltage value of the voltage signal V1, the higher the frequency of its output electrical signal V2. The smaller the voltage value of the voltage signal V1, the lower the frequency of its output electrical signal V2.

[0115] In one embodiment, the frequency adjustment module 120 in the foregoing embodiment outputs an electrical signal of a corresponding frequency according to the voltage value of the voltage signal. The frequency adjustment module 120 can be a circuit module whose output frequency changes with the input voltage, which will not be described in detail here.

[0116] Step 303: When it is determined that the voltage value of the voltage signal is within the voltage range corresponding to the preset windowing frequency band, the electrical signal of the windowing frequency band is not output.

[0117] The windowing frequency band is accurately determined based on the voltage value of voltage signal V1. When the voltage value of voltage signal V1 is within the voltage range corresponding to the windowing frequency band, the electrical signal V2 of the windowing frequency band is not output, thereby windowing the sweep signal. Therefore, the timing of windowing can be accurately controlled, thus improving the windowing accuracy.

[0118] In one embodiment, the voltage value of a voltage signal V1 that changes at a uniform rate is detected. If it is determined that the voltage value of voltage signal V1 is not within the voltage range corresponding to a preset windowed frequency band, an electrical signal V2 with the corresponding frequency of voltage signal V1 is output. If it is determined that the voltage value of voltage signal V1 is within the voltage range corresponding to the preset windowed frequency band, the electrical signal V2 with the corresponding frequency is not output.

[0119] In one embodiment, the windowed frequency band includes a first frequency point, a second frequency point, and a frequency point between the first and second frequency points. When the electrical signal V2 sweeps from a low frequency to a high frequency, if the absolute value of the difference between the voltage value of the voltage signal V1 and the first voltage threshold corresponding to the first frequency point is less than a first preset difference, the electrical signal V2 in the windowed frequency band is not output. If the absolute value of the difference between the voltage value of the voltage signal V1 and the second voltage threshold corresponding to the second frequency point is less than a second preset difference, the electrical signal V2 in the windowed frequency band is output.

[0120] In one embodiment, the windowed frequency band includes a first frequency point, a second frequency point, and a frequency point between the first and second frequency points. When the electrical signal V2 sweeps from a high frequency to a low frequency, if the absolute value of the difference between the voltage value of the voltage signal V1 and the second voltage threshold corresponding to the second frequency point is less than a second preset difference, the electrical signal V2 in the windowed frequency band is not output. If the absolute value of the difference between the voltage value of the voltage signal V1 and the first voltage threshold corresponding to the first frequency point is less than the first preset difference, the electrical signal V2 in the windowed frequency band is output.

[0121] It is understood that the signal windowing method provided in this application embodiment can be used in the signal windowing circuit or signal interference device in the corresponding embodiment provided above. The beneficial effects that can be achieved can be referred to the beneficial effects of the signal windowing circuit in the corresponding embodiment provided above, and will not be repeated here.

[0122] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0123] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. [Amended according to Rule 26 07.11.2025] A signal windowing circuit, the signal windowing circuit comprising a signal generation module, a frequency adjustment module and a windowing module; The signal generation module is used to output a voltage signal whose voltage value changes at a constant rate. The frequency adjustment module is connected to the signal generation module, and the frequency adjustment module is used to output an electrical signal of a corresponding frequency to the windowing module according to the voltage value of the voltage signal. The windowing module is connected to the signal generation module and the frequency adjustment module. The windowing module is used to not output the electrical signal of the windowing frequency band when it is determined that the voltage value of the voltage signal is within the voltage range corresponding to the preset windowing frequency band.

2. [Amended according to Rule 26 07.11.2025] The signal windowing circuit according to claim 1 is characterized in that, The window opening module includes a switch module and a first control module; The switching module is connected to the frequency adjustment module; the switching module outputs the electrical signal in the on state and stops outputting the electrical signal in the off state. The first control module is connected to the switch module and the signal generation module respectively; the first control module is used to control the switch module to switch to the off state when it is determined that the voltage value of the voltage signal reaches the voltage range corresponding to the preset windowing frequency band.

3. [Amended according to Rule 26 07.11.2025] The signal windowing circuit according to claim 2 is characterized in that, The windowed frequency band includes a first frequency point, a second frequency point, and a frequency point between the first frequency point and the second frequency point; the second frequency point is greater than the first frequency point. When the electrical signal sweeps from low frequency to high frequency, the first control module is used to control the switch module to switch to the off state when it is determined that the absolute value of the difference between the voltage value of the voltage signal and the first voltage threshold corresponding to the first frequency point is less than the first preset difference, and to control the switch module to switch to the on state when it is determined that the absolute value of the difference between the voltage value of the voltage signal and the second voltage threshold corresponding to the second frequency point is less than the second preset difference. and / or When the electrical signal sweeps from high frequency to low frequency, the first control module controls the switch module to switch to the off state when the absolute value of the difference between the voltage value of the voltage signal and the second voltage threshold corresponding to the second frequency point is less than the second preset difference, and controls the switch module to switch to the on state when the absolute value of the difference between the voltage value of the voltage signal and the first voltage threshold corresponding to the first frequency point is less than the first preset difference.

4. [Amended according to Rule 26 07.11.2025] The signal windowing circuit according to claim 3 is characterized in that, When the electrical signal sweeps from low frequency to high frequency, the first control module is configured to control the switch module to switch to the off state when it determines that the voltage value of the voltage signal reaches the first voltage threshold corresponding to the first frequency point, and the signal generation module is configured to continue outputting a voltage signal with a uniformly increasing voltage value after the switch module switches to the off state; the first control module is further configured to control the switch module to switch to the on state when it determines that the voltage value of the voltage signal reaches the second voltage threshold corresponding to the second frequency point, and the signal generation module is configured to continue outputting a voltage signal with a uniformly increasing voltage value after the switch module switches to the on state; and / or, When the electrical signal sweeps from high frequency to low frequency, the first control module is used to control the switch module to switch to the off state when it is determined that the voltage value of the voltage signal reaches the second voltage threshold corresponding to the second frequency point, and the signal generation module is used to continue to output a voltage signal with a uniformly decreasing voltage value after the switch module is switched to the off state; the first control module is also used to control the switch module to switch to the on state when it is determined that the voltage value of the voltage signal reaches the first voltage threshold corresponding to the first frequency point, and the signal generation module is used to continue to output a voltage signal with a uniformly decreasing voltage value after the switch module is switched to the on state.

5. [Amended according to Rule 26 07.11.2025] The signal windowing circuit according to claim 1 is characterized in that, The signal generation module includes a first processing unit and a second processing unit; The first arithmetic unit is used to receive a reference voltage signal and a square wave signal that varies in a step, and output a first signal with a constant current value according to the reference voltage signal and the square wave signal. The second arithmetic unit is connected to the first arithmetic unit and is also connected to the frequency adjustment module; the second arithmetic unit is used to output a voltage signal whose voltage value changes uniformly to the value corresponding to each step voltage value of the square wave signal according to the first signal.

6. [Amended according to Rule 26 07.11.2025] The signal windowing circuit according to claim 5 is characterized in that, The first operational unit includes a first operational amplifier, a first resistor, a second resistor, and a third resistor; The first input terminal of the first operational amplifier receives the square wave signal through the third resistor; The first end of the first resistor is used to receive the reference voltage signal, and the second end of the first resistor is connected to the second input terminal of the first operational amplifier. The second resistor is connected between the second input terminal and the output terminal of the first operational amplifier, and the output terminal of the first operational amplifier is used to output the first signal.

7. [Amended according to Rule 26 07.11.2025] The signal windowing circuit according to claim 5 is characterized in that, The second operational unit includes a second operational amplifier, a fourth resistor, a fifth resistor, and a first capacitor; The first end of the fourth resistor is used to receive the first signal, and the second end of the fourth resistor is connected to the first input terminal of the second operational amplifier; the second input terminal of the second operational amplifier is used to connect to a preset voltage source. The first end of the fifth resistor is connected to the output terminal of the second operational amplifier, and the second end of the fifth resistor is connected to the first operational unit; The first capacitor is connected between the first input terminal and the output terminal of the second operational amplifier, and the output terminal of the second operational amplifier is used to output the voltage signal.

8. [Amended according to Rule 26 07.11.2025] The signal windowing circuit according to claim 1 is characterized in that, The signal generation module includes a first negative feedback circuit, an integral circuit, and a second negative feedback circuit. The first negative feedback circuit is used to receive a reference voltage signal and a square wave signal that varies in a step, and outputs a first signal with a constant current value according to the reference voltage signal and the square wave signal. The integrating circuit is used to generate a voltage signal whose voltage value rises or falls at a constant speed based on the first signal; The second negative feedback circuit is used to control the amplitude of the voltage signal to rise or fall to the value corresponding to each step voltage value of the square wave signal according to the voltage value of the square wave signal.

9. [Amended according to Rule 26 07.11.2025] The signal windowing circuit according to claim 8 is characterized in that, The signal generation module includes a first operational amplifier, a first resistor, a second resistor, a third resistor, a second operational amplifier, a fourth resistor, a fifth resistor, and a first capacitor; The first input terminal of the first operational amplifier receives the square wave signal through the third resistor, and the second input terminal of the first operational amplifier receives the reference voltage signal through the first resistor; the second resistor is connected between the second input terminal and the output terminal of the first operational amplifier. The first input terminal of the second operational amplifier is connected to the output terminal of the first operational amplifier through the fourth resistor. The second input terminal of the second operational amplifier is used to connect to a preset voltage source, and the output terminal of the second operational amplifier is used to output the voltage signal. The fifth resistor is connected between the output terminal of the second operational amplifier and the first input terminal of the first operational amplifier. The first capacitor is connected between the first input terminal and the output terminal of the second operational amplifier. The operational amplifier, the first resistor, and the second resistor constitute the first negative feedback circuit; the operational amplifier, the first capacitor, and the fourth resistor constitute the integrating circuit; and the third resistor, the fifth resistor, the first operational amplifier, and the second operational amplifier constitute the second negative feedback circuit.

10. [Amended according to Rule 26 07.11.2025] The signal windowing circuit according to claim 6 is characterized in that, The first resistor is a potentiometer, and / or the second resistor is a potentiometer.

11. [Amended according to Rule 26 07.11.2025] The signal windowing circuit according to claim 6 is characterized in that, The resistance value of the second resistor is greater than the resistance value of the first resistor.

12. [Amended according to Rule 26 07.11.2025] The signal windowing circuit according to claim 5 is characterized in that, It also includes a low-dropout linear regulator, which is used to output the reference voltage signal.

13. [Amended according to Rule 26 07.11.2025] The signal windowing circuit according to claim 5 is characterized in that, The square wave signal exhibiting a stepped change includes any one of the following: a square wave signal that rises in a stepped manner, a square wave signal that falls in a stepped manner, a square wave signal that rises in a stepped manner followed by a step-falling manner, or a square wave signal that falls in a stepped manner followed by a step-riseing manner.

14. [Amended according to Rule 26 07.11.2025] The signal windowing circuit according to claim 1 is characterized in that, The signal generation module includes a third control module and a second digital-to-analog conversion module; The third control module is connected to the second digital-to-analog converter module; the second digital-to-analog converter module is also connected to the frequency adjustment module; the third control module is used to control the output voltage signal of the second digital-to-analog converter module to rise or fall at a uniform speed.

15. [Amended according to Rule 26 07.11.2025] The signal windowing circuit according to claim 1 is characterized in that, The frequency adjustment module includes a voltage-controlled oscillator.

16. [Amended according to Rule 26, 2007.11.2025] A signal interference device, comprising a signal windowing circuit; the signal windowing circuit comprises a signal generation module, a frequency adjustment module, and a windowing module; The signal generation module is used to output a voltage signal whose voltage value changes at a constant rate. The frequency adjustment module is connected to the signal generation module, and the frequency adjustment module is used to output an electrical signal of a corresponding frequency to the windowing module according to the voltage value of the voltage signal. The windowing module is connected to the signal generation module and the frequency adjustment module. The windowing module is used to not output the electrical signal of the windowing frequency band when it is determined that the voltage value of the voltage signal is within the voltage range corresponding to the preset windowing frequency band.

17. [Amended according to Rule 26 07.11.2025] The signal jamming device according to claim 16 is characterized in that, The signal jamming device includes a frequency jammer.

18. [Amended according to Rule 26, 07.11.2025] A signal windowing method, comprising: Acquire a voltage signal whose voltage value changes at a constant rate; Output an electrical signal of the corresponding frequency based on the voltage value of the voltage signal; When the voltage value of the voltage signal is determined to be within the voltage range corresponding to the preset windowed frequency band, the electrical signal of the windowed frequency band is not output.

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