Signal processing device and method, digital oscilloscope

Abstract

Signal Processing Apparatus and Method, Digital Oscilloscope, The signal processing apparatus is configured to output one of two types of target signals based on a trigger signal and a trigger level, and includes a trigger comparison unit (100) configured to extract a low-frequency component signal of the trigger signal, a controller (200) electrically connected to the trigger comparison unit (100) and configured to generate a trigger comparison signal based on the relationship between the low-frequency component signal and the trigger signal, and output one of the target signals obtained based on the trigger comparison signal according to a preset, and a trigger display unit (500) electrically connected to the controller (200) and configured to receive the target signal and display it on a target interaction interface.

Description

Technical Field

[0001] This application claims the priority of Chinese Patent Application No. 202310196210.1, filed with the China National Intellectual Property Administration on March 3, 2023, the entire content of which is incorporated herein by reference. The present disclosure relates to the field of electronic circuit technologies such as signal processing apparatuses and methods, and digital oscilloscopes.

Background Art

[0002] As electronic devices become more complex, there is a demand for various tools for recording, analyzing, and visualizing measurement statistical data such as waveform data. An oscilloscope, as a widely used electronic measuring instrument, converts an electrical signal into a waveform image, making it easier to analyze the variation process of various electrical signals. The trigger function is a core function of an oscilloscope. Most conventional digital oscilloscopes adopt digital triggers, and the processing of trigger signals and the expansion of trigger methods can be executed in the digital circuit section. In order to make the captured and output waveforms more stable and reliable, a digital oscilloscope can filter noise and prevent false triggers by setting a specific coupling mode according to the characteristics of the signal under the trigger.

[0003] When the captured signal contains low-frequency interference, such as 50Hz power frequency interference within the power supply ripple, and the digital oscilloscope trigger becomes unstable, the low-frequency suppression mode of the digital oscilloscope's trigger function is typically used. In digital oscilloscopes, when the trigger function employs low-frequency suppression mode or AC trigger coupling mode, the waveform sampled by the digital circuit passes through a digital low-pass filter, suppressing low-frequency components while retaining high-frequency components. Therefore, after the trigger signal passes through the filter, the low-frequency signal is suppressed. Furthermore, because the trigger level setting lacks a correspondence with the actual trigger signal, the sampled waveform displayed on the oscilloscope interface is out of sync with the pulse voltage set by the user. As a result, when the user adjusts the trigger level, they cannot intuitively observe relevant information about the actual trigger signal, such as peak information of the actual trigger signal, which has had its low-frequency signals suppressed. Consequently, the user's adjustment of the trigger level becomes a blind adjustment without reference, reducing the accuracy of the trigger level setting. [Overview of the project] [Problems that the invention aims to solve]

[0004] This disclosure provides signal processing equipment and methods, and a digital oscilloscope. [Means for solving the problem]

[0005] One aspect of the present disclosure provides a signal processing device comprising: a trigger comparison unit configured to output one of two target signals based on a trigger signal and a trigger level, and configured to extract a low-frequency component signal of a trigger signal; a controller electrically connected to the trigger comparison unit and configured to output one of the target signals obtained based on the trigger comparison signal according to a preset which includes generating a trigger comparison signal based on the relationship between the low-frequency component signal and the trigger signal, and comparing the trigger comparison signal with a trigger level; and a trigger display unit electrically connected to the controller and configured to receive the above target signals and display them on a target interaction interface.

[0006] Another aspect of this disclosure provides a digital oscilloscope including a signal processing device described in any one of the above embodiments.

[0007] Another aspect of this disclosure is a signal processing method for outputting one of two target signals based on a trigger signal and a trigger level, comprising: outputting one target signal obtained based on the trigger comparison signal according to a preset that includes extracting a low-frequency component signal of the trigger signal; generating a trigger comparison signal based on the relationship between the low-frequency component signal and the trigger signal; and comparing the trigger comparison signal with the trigger level; and receiving this target signal and displaying it on a target interaction interface. The present invention provides a signal processing method that includes [the following]. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram illustrating the principle of a signal processing device according to one embodiment of the present disclosure. [Figure 2] This is a schematic diagram illustrating the principle of another signal processing device according to one embodiment of the present disclosure. [Figure 3] This is a schematic diagram illustrating the principle of another signal processing device according to one embodiment of the present disclosure. [Figure 4]This is a schematic diagram illustrating the principle of another signal processing device according to one embodiment of the present disclosure. [Figure 5] This is a schematic graph of the target signal according to one embodiment of the present disclosure. [Figure 6] This is a schematic diagram illustrating the principle of another signal processing device according to one embodiment of the present disclosure. [Figure 7] This is a schematic diagram illustrating the principle of a waveform display unit according to one embodiment of the present disclosure. [Figure 8] A schematic flowchart of a signal processing method according to one embodiment of this disclosure. [Modes for carrying out the invention]

[0009] The present disclosure will be described below with reference to the relevant accompanying drawings. Embodiments of the present disclosure are shown in the accompanying drawings. However, the present disclosure may be implemented in many different forms.

[0010] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to benefit from this disclosure. Terms used herein in the description of this disclosure are used solely for the purpose of describing specific embodiments and are not intended to limit this disclosure. The terms "and / or" as used herein include any and all combinations of one or more of the related enumerated items.

[0011] Where used herein, the singular forms of “one,” “one,” and “the above / the said” may also include the plural form unless the context clearly indicates otherwise. Furthermore, where the terms “consist of” and / or “include” are used herein, it should be understood that they may identify the presence of such features, integers, steps, operations, elements, and / or groups, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, and / or groups. Also, where used herein, the term “and / or” includes any combination of the listed related items.

[0012] The drawings provided in this embodiment merely schematically illustrate the basic concepts of the disclosure and show only the components relevant to the disclosure. They are not drawn to match the number, shape, and size of the components in actual implementation. In actual implementation, the form, number, and proportion of multiple components may be arbitrarily changed, and the layout of the components may become more complex.

[0013] In this specification, various components may be described using terms such as "first," "second," etc., but these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of this disclosure, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component.

[0014] In this disclosure, unless otherwise specified or limited, terms such as “connection” and “link” shall be broadly understood to mean, for example, a direct connection or an indirect connection through an intermediate medium, or an internal communication between two elements, or an interaction relationship between two elements. Those skilled in the art will be able to understand the meaning of the above terms in this disclosure as appropriate to the context.

[0015] Referring to Figure 1, conventional analog oscilloscopes use analog circuits such as an oscilloscope tube. Electrons are emitted from the oscilloscope tube's electron gun onto a screen, where they are focused to form an electron beam. This beam then strikes a screen coated with a fluorescent material, causing light to be emitted from the spot where the electron beam hits, thus drawing a waveform curve. Digital storage oscilloscopes (DSOs), also known as digital oscilloscopes, convert test signals into digital information using an analog-to-digital converter and store it. The waveform signal is then reconstructed from this stored digital information and displayed on the oscilloscope screen. Without special settings, an oscilloscope captures signals and generates waveforms at a constant frequency. However, because the sampling frequency and the signal fluctuation frequency do not perfectly match, there will always be differences in the waveforms generated when the oscilloscope captures a signal. To obtain a stable waveform display, it is common to synchronize the oscilloscope's scan frequency with the signal fluctuation frequency by setting a single "trigger event" (e.g., a single level, i.e., a trigger level). That is, when the oscilloscope detects a target event in the signal flow where the captured signal is above the trigger level, the comparator in the oscilloscope's trigger module outputs a high level, and from this point the oscilloscope begins scanning and can display the waveform. To make the captured and outputted waveforms more stable and reliable, digital oscilloscopes can filter noise and prevent false triggers by setting specific coupling modes according to the characteristics of the signal under trigger conditions.

[0016] When the captured signal contains low-frequency interference, such as 50Hz power frequency interference within the power supply ripple, causing the digital oscilloscope trigger to become unstable, the low-frequency suppression mode of the digital oscilloscope's trigger function is typically used. However, when using a digital oscilloscope, if the trigger function employs low-frequency suppression mode or AC trigger coupling mode, the waveform sampled by the digital circuit passes through a digital low-pass filter, suppressing the low-frequency components while retaining the high-frequency components. Therefore, after the trigger signal passes through the filter, the low-frequency signal is suppressed. Furthermore, because the trigger level setting lacks a correspondence with the actual trigger signal, the sampled waveform displayed on the oscilloscope interface will be out of sync with the pulse voltage set by the user. Consequently, when the user adjusts the trigger level, they cannot intuitively observe relevant information about the actual trigger signal, such as peak information of the actual trigger signal, where the low-frequency signal has been suppressed.

[0017] Based on this, the present disclosure provides a signal processing device and method, and a digital oscilloscope, which, at least in the case where the trigger function in the digital oscilloscope employs a low-frequency suppression mode or an AC trigger coupling mode, can correct the discrepancy between the trigger level and the trigger signal, establish a correspondence between the trigger level setting and the actual trigger signal, enable display in the interaction interface, allow the user to intuitively observe relevant information of the actual trigger signal after low-frequency signal suppression, facilitate user adjustment of the trigger level, and improve the accuracy of trigger level setting.

[0018] Referring to FIG. 2, according to some embodiments, there is provided a signal processing apparatus configured to output one of two types of target signals based on a trigger signal and a trigger level, including a trigger comparison unit 100 configured to extract a low-frequency component signal of the trigger signal, and a controller 200 electrically connected to the trigger comparison unit 100, configured to generate a trigger comparison signal based on the relationship between the low-frequency component signal and the trigger signal, and output one of the target signals obtained based on the trigger comparison signal according to a preset including comparing the trigger comparison signal with the trigger level, and a trigger display unit 500 electrically connected to the controller, configured to receive the target signal and display it on a target interaction interface.

[0019] Continuing to refer to FIG. 2, in the signal processing apparatus of the above embodiment, by extracting a low-frequency component signal of the trigger signal, for example, a low-frequency component signal including a DC signal, a trigger comparison signal is generated based on the relationship between the low-frequency component signal and the trigger signal, that is, an actual trigger signal with the low-frequency signal suppressed is obtained, and a target signal including relevant information of the actual trigger signal with the low-frequency signal suppressed obtained based on the trigger comparison signal is output. Therefore, when the trigger function in a digital oscilloscope adopts a low-frequency suppression mode or an AC trigger coupling mode, the correspondence between the trigger level setting and the actual trigger signal is established, the deviation between the trigger level and the trigger signal is corrected, and the target signal is displayed on the interaction interface, so that the user can intuitively observe the relevant information of the actual trigger signal with the low-frequency signal suppressed, facilitating the user to adjust the trigger level based on the relevant information of the actual trigger signal, and improving the setting accuracy of the trigger level.

[0020] Continuing to refer to FIG. 2, in some embodiments, since the trigger comparison signal is a signal obtained by filtering the low-frequency component signal from the trigger signal, the trigger comparison signal is converted into a high-frequency AC signal.

[0021] In some embodiments, the trigger comparison unit 100 consists of a digital filter capable of obtaining the magnitude of the instantaneous DC component by using arithmetic statistical average to extract the low-frequency component signal of the trigger signal. The digital filter includes a Finite Impulse Response (FIR) filter or an Infinite Impulse Response (IIR) filter, etc. For example, the digital filter uses an FIR filter, also called a non-recursive filter, as the most basic component of the digital signal processing system, ensuring arbitrary amplitude frequency characteristics while having a strictly linear phase frequency characteristic. At the same time, since its unit sample response is of finite length, the FIR filter is a stable system and is widely applied in fields such as communication, image processing, and pattern recognition.

[0022] Referring to FIG. 3, in some embodiments, the signal processing device is electrically connected to the controller 200 and further includes a delay unit 300 configured to compensate for the delay of the trigger comparison unit 100 by moving the low-frequency component signal and the trigger signal in the time dimension. For example, when setting the time dimension of the low-frequency component signal and the trigger signal in the horizontal direction, the movement of the low-frequency component signal and the trigger signal in the time dimension is regarded as the movement in the horizontal direction, and the low-frequency component signal is aligned with the trigger signal in the time dimension to facilitate subsequent signal processing and user observation.

[0023] Referring to Figures 4 and 5, in some embodiments, the controller 200 is further configured to acquire the peak signal of the trigger comparison signal. The target signal includes the peak signal of the actual trigger signal with low-frequency signals suppressed, so when the trigger function in the digital oscilloscope employs low-frequency suppression mode or AC trigger coupling mode, it is possible to establish a correspondence between the trigger level setting and the actual trigger signal, correct the discrepancy between the trigger level and the trigger signal, and display the peak signal of the trigger comparison signal on the interaction interface. This allows the user to intuitively observe the peak signal of the actual trigger signal with low-frequency signals suppressed, facilitates user adjustment of the trigger level based on relevant information of the actual trigger signal, and improves the accuracy of trigger level setting. Furthermore, by acquiring the peak signal of the trigger comparison signal, the amplitude range of the trigger comparison signal can be identified without processing the entire trigger comparison signal, making the implementation easier, reducing the amount of signal processing data for the controller 200, and improving the signal processing efficiency of the signal processing device.

[0024] In some embodiments, the preset rule includes the following: if the value corresponding to the amplitude of the trigger comparison signal is smaller than the value corresponding to the amplitude of the trigger level, the digital oscilloscope stops the trigger function, the trigger display unit displays a target signal on the target interaction interface which includes a peak signal and an initial waveform, the initial waveform includes at least one trigger waveform, for example, a plurality of trigger waveforms with different phases that are sequentially displayed on the target interaction interface, the user adjusts the trigger level based on the target signal displayed on the target interaction interface to improve the accuracy of setting the trigger level, and if the value corresponding to the amplitude of the trigger comparison signal is greater than or equal to the value corresponding to the amplitude of the trigger level, the digital oscilloscope implements the trigger function, i.e., captures one trigger waveform from the initial waveform, the trigger display unit displays a target signal on the target interaction interface which includes a peak signal and an initial waveform, the user can intuitively observe the trigger waveform displayed on the target interaction interface and related information of the trigger comparison signal, i.e., related information of the actual trigger signal with low-frequency signals suppressed, and in some embodiments, the trigger signal may be generated based on the initial waveform. In this embodiment, the value corresponding to the amplitude of the signal is the absolute value of the signal amplitude.

[0025] Continuing to refer to Figures 4 and 5, in some embodiments, if the peak signal of the trigger comparison signal includes the maximum value Vmax and / or minimum value Vmin of the trigger comparison signal, the amplitude range of the trigger comparison signal is from the maximum value Vmax to the minimum value Vmin of the trigger comparison signal, thereby establishing a correspondence between the trigger level and the maximum value Vmax and / or minimum value Vmin of the trigger comparison signal, the target signal is displayed in the user interface in the form of an image, and the trigger comparison signal shown in Figure 5 is not displayed in the user interface, allowing the user to intuitively observe the peak signal of the trigger comparison signal and / or Only the minimum value Vmin of the trigger comparison signal is displayed, and the trigger level is set between the maximum value Vmax of the trigger comparison signal and the minimum value Vmin of the trigger comparison signal to serve as a reference for setting the trigger level. This facilitates the implementation of the oscilloscope's trigger function, and in some embodiments, the trigger level setting range includes 0.5Vmax to 0.8Vmax or 0.5Vmin to 0.8Vmin. For example, by setting the trigger level to 0.5Vmax, 0.6Vmax, 0.7Vmax, 0.8Vmax, 0.5Vmin, 0.6Vmin, 0.7Vmin, or 0.8Vmin, the oscilloscope's trigger function can be reliably implemented.

[0026] Referring to Figure 6, in some embodiments, the signal processing device further includes an analog-to-digital converter 400 whose output terminals are connected to the input terminals of the trigger comparison unit 100 and the input terminals of the delay unit 300, and which is configured to convert the trigger signal from an analog quantity to a digital quantity.

[0027] Referring to Figure 7, in some embodiments, the controller 200 is configured to generate a trigger comparison signal, and the trigger display unit 500 is configured to output and display a target signal.The trigger display unit 500 includes a waveform processing unit 501, a waveform drawing unit 502, a trigger interpolation unit 503, a trigger drawing unit 504, and a waveform display unit 505. The waveform processing unit 501 has input terminals connected to an analog-to-digital converter 400 and a controller 200, receives trigger position and trigger level pulses output from the controller 200, and trigger signals output via the analog-to-digital converter 400, and outputs waveform signals to be drawn. The waveform drawing unit 502 has input terminals connected to the output terminals of the waveform processing unit 501 and output terminals connected to the waveform display unit 505, receives waveform signals to be drawn, and outputs waveform signals to be displayed. The trigger interpolation unit 503 has input terminals connected to the output terminals of the controller 200 and output terminals connected to the input terminals of the trigger drawing unit 504, and is configured to perform high-precision triggering on the trigger comparison signal output from the controller 200 and output trigger waveform signals to be drawn, thereby achieving a higher equivalent sampling rate. High-precision triggering is achieved by... This refers to the need to interpolate the original data when the number of pulling points is less than the number of pixels in the display interface, and the need to perform threshold comparison and trigger position processing on the interpolated data to more accurately identify which interpolation point the trigger position is at. For example, if the original sampling rate is 10GSa / s and the sampling point interval is 100ps, then if the interpolation ratio is 100x, the equivalent sampling rate will be improved by 100x, and the trigger resolution will also be improved by 100x, resulting in trigger processing with a resolution of 1ps. The trigger drawing unit 504 has an output terminal connected to the waveform display unit 505 and is configured to receive the trigger waveform signal to be drawn and output the trigger waveform signal to be displayed. The waveform display unit 505 is configured to display the target signal on the target interaction interface so that the user can more intuitively observe the relevant information of the actual trigger signal with low-frequency signals suppressed, thereby facilitating user adjustment of the trigger level and improving the accuracy of trigger level setting.In some embodiments, the display module of the waveform display unit 505 can use a field programmable gate array (FPGA) or a central processing unit / processor (CPU) for display processing. For example, processing using an FPGA provides faster display speed, while processing using a CPU offers greater flexibility in display format. In some embodiments, the waveform display unit 505 can display a floating screen or a split screen. For example, in the case of a split screen display, the split screen may be understood as displaying the waveform signal to be displayed in the upper half of the screen and the trigger waveform signal to be displayed in the lower half of the screen, or the displays of the upper and lower halves may be swapped. Also, for example, in the case of a floating screen display, the floating screen display may be understood as the display window for the trigger waveform signal to be displayed floating above the display window for the waveform signal to be displayed. Switching between the above two display modes can be achieved by switching the configuration window, selecting a configuration in the menu of the signal processing device, or switching shortcut icons in the user interface, thereby improving the user's interactive experience.

[0028] According to some embodiments, another aspect of the present disclosure provides a digital oscilloscope including a signal processing device described in any one of the above embodiments.

[0029] In the digital oscilloscope of the above embodiment, a trigger comparison signal is generated based on the relationship between the low-frequency component signal and the trigger signal by extracting the low-frequency component signal of the trigger signal, for example, the DC signal, thereby obtaining the actual trigger signal with the low-frequency signal suppressed. Furthermore, a target signal is output that includes relevant information about the actual trigger signal with the low-frequency signal suppressed, obtained based on the trigger comparison signal. When the trigger function in the digital oscilloscope employs a low-frequency suppression mode or an AC trigger coupling mode, a correspondence relationship between the trigger level setting and the actual trigger signal is established, the discrepancy between the trigger level and the trigger signal is corrected, and the target signal including the trigger comparison signal is displayed on the interaction interface. This allows the user to intuitively observe the actual trigger signal with the low-frequency signal suppressed, facilitates user adjustment of the trigger level based on relevant information about the actual trigger signal, and improves the accuracy of trigger level setting.

[0030] Referring to Figure 8, according to some embodiments, there is a signal processing method for outputting one of two types of target signals based on a trigger signal and a trigger level,

[0031] Step S10: Step to extract the low-frequency component signal of the trigger signal.

[0032] Step S20: A step of outputting one target signal obtained based on the trigger comparison signal, according to a preset which includes generating a trigger comparison signal based on the relationship between the low-frequency component signal and the trigger signal, and comparing the trigger comparison signal with the trigger level.

[0033] S30: The step of receiving one of the target signals mentioned above and displaying it on the target interaction interface. A signal processing method including this was provided.

[0034] Continuing to refer to Figure 8, in steps S10 and S20 of the signal processing method of the above embodiment, a trigger comparison signal is generated based on the relationship between the low-frequency component signal and the trigger signal, that is, an actual trigger signal with the low-frequency signal suppressed is obtained, and a target signal is output that includes relevant information of the actual trigger signal with the low-frequency signal suppressed, obtained based on the trigger comparison signal. Therefore, when the trigger function in the digital oscilloscope employs a low-frequency suppression mode or an AC trigger coupling mode, a correspondence relationship between the trigger level setting and the actual trigger signal is established, the discrepancy between the trigger level and the trigger signal is corrected, and the target signal including the trigger comparison signal is displayed on the interaction interface. This allows the user to intuitively observe the actual trigger signal with the low-frequency signal suppressed, facilitates user adjustment of the trigger level based on relevant information of the actual trigger signal, and improves the accuracy of trigger level setting.

[0035] The steps in the flowchart of Figure 8 are shown sequentially as indicated by the arrows, but these steps are not necessarily performed in the order indicated by the arrows. Unless expressly stated herein, the execution of these steps is not restricted to a strict order, and they may be performed in other orders. Furthermore, at least some of the steps in Figure 8 may include multiple substeps or stages, but these substeps or stages may not necessarily be performed at the same time, but at different times, and the execution of these substeps or stages may not necessarily be sequential, but may be performed sequentially or alternately with other steps, or at least some of the substeps or stages of other steps.

[0036] The trigger comparison signal is obtained by filtering out the low-frequency components from the trigger signal; therefore, the trigger comparison signal is converted into a high-frequency AC signal.

[0037] In some embodiments, the trigger comparison signal is obtained by filtering out the low-frequency components from the trigger signal, and therefore the trigger comparison signal is converted into a high-frequency AC signal.

[0038] Continuing to refer to Figures 2 and 8, in some embodiments, the trigger comparison unit 100 consists of a digital filter capable of obtaining the magnitude of the instantaneous DC component using an arithmetic statistical mean in order to extract the low-frequency component signal of the trigger signal. The digital filter includes FIR or IIR filters, for example. By using an FIR filter, also called a non-recurrent filter, as the most basic component of a digital signal processing system, the digital filter ensures arbitrary amplitude-frequency characteristics while having strictly linear phase-frequency characteristics, and at the same time, its unit sample response is finite length. Therefore, the FIR filter is a stable system and is widely applied in fields such as communications, image processing, and pattern recognition.

[0039] Referring to Figures 3 and 8, in some embodiments, the signal processing device further includes a delay unit 300 electrically connected to the controller 200, and the signal processing method further includes compensating for the delay of the trigger comparison unit 100 by moving the low-frequency component signal together with the trigger signal in the time dimension, for example, when the time dimensions of the low-frequency component signal and the trigger signal are set horizontally, the movement of the low-frequency component signal and the trigger signal in the time dimension is considered to be the movement of the low-frequency component signal and the trigger signal horizontally, and the low-frequency component signal is aligned with the trigger signal in the time dimension to facilitate subsequent signal processing and user observation.

[0040] Referring to Figures 4, 5, and 8, in some embodiments, the above signal processing method further includes acquiring the peak signal of the trigger comparison signal. Since the target signal includes the peak signal of the actual trigger signal with low-frequency signals suppressed, when the trigger function in the digital oscilloscope employs a low-frequency suppression mode or AC trigger coupling mode, it is possible to establish a correspondence between the trigger level setting and the actual trigger signal, correct the discrepancy between the trigger level and the trigger signal, and display the peak signal of the trigger comparison signal on the interaction interface. This allows the user to intuitively observe the peak signal of the actual trigger signal with low-frequency signals suppressed, facilitating user adjustment of the trigger level based on relevant information of the actual trigger signal and improving the accuracy of trigger level setting. Furthermore, by acquiring the peak signal of the trigger comparison signal, the amplitude range of the trigger comparison signal can be identified without processing the entire trigger comparison signal, simplifying the implementation, reducing the amount of signal processing data for the controller 200, and improving the signal processing efficiency of the signal processing device.

[0041] In some embodiments, the preset rule includes the following: if the value corresponding to the amplitude of the trigger comparison signal is smaller than the value corresponding to the amplitude of the trigger level, the digital oscilloscope stops the trigger function, the trigger display unit displays a target signal on the target interaction interface which includes a peak signal and an initial waveform, the initial waveform includes at least one trigger waveform, for example, a plurality of trigger waveforms with different phases that are sequentially displayed on the target interaction interface, the user adjusts the trigger level based on the target signal displayed on the target interaction interface to improve the accuracy of setting the trigger level, and if the value corresponding to the amplitude of the trigger comparison signal is greater than or equal to the value corresponding to the amplitude of the trigger level, the digital oscilloscope implements the trigger function, i.e., captures one trigger waveform from the initial waveform, the trigger display unit displays a target signal on the target interaction interface which includes a peak signal and a trigger waveform, the user can intuitively observe the trigger waveform displayed on the target interaction interface and related information of the trigger comparison signal, i.e., related information of the actual trigger signal with low-frequency signals suppressed, and in some embodiments, the trigger signal may be generated based on the initial waveform. In this embodiment, the value corresponding to the amplitude of the signal is the absolute value of the signal amplitude.

[0042] Continuing to refer to Figures 4, 5, and 8, in some embodiments, if the peak signal of the trigger comparison signal includes the maximum value Vmax and / or minimum value Vmin of the trigger comparison signal, then the amplitude range of the trigger comparison signal is from the maximum value Vmax to the minimum value Vmin of the trigger comparison signal, thereby establishing a correspondence between the trigger level and the maximum value Vmax and / or minimum value Vmin of the trigger comparison signal, and the target signal is displayed in the user interface in the form of an image, and the trigger comparison signal shown in Figure 5 is not displayed in the user interface, and the maximum value Vmax and / or minimum value Vmin of the trigger comparison signal are displayed so that the user can intuitively observe the peak signal. Only the minimum value Vmin of the trigger comparison signal is displayed, and the trigger level is set between the maximum value Vmax of the trigger comparison signal and the minimum value Vmin of the trigger comparison signal to serve as the basis for setting the trigger level. This facilitates the implementation of the oscilloscope's trigger function, and in some embodiments, the setting range of the trigger level includes 0.5Vmax to 0.8Vmax, or 0.5Vmin to 0.8Vmin. For example, the trigger function of the oscilloscope can be reliably implemented by setting the trigger level to 0.5Vmax, 0.6Vmax, 0.7Vmax, 0.8Vmax, 0.5Vmin, 0.6Vmin, 0.7Vmin, or 0.8Vmin, etc.

[0043] Referring to Figures 6 and 8, in some embodiments, the signal processing device further includes an analog-to-digital converter 400 whose output terminals are connected to the input terminals of a trigger comparison unit 100 and a delay unit 300, and the above signal processing method further includes converting the trigger signal from an analog quantity to a digital quantity. [Industrial applicability]

[0044] As will be apparent to those skilled in the art, according to the above implementation, the present application can be implemented with the help of software and necessary general-purpose hardware, or by hardware alone. Based on this finding, the technical solution of the present application can essentially be embodied in the form of a software product containing a plurality of instructions stored on a computer-readable storage medium such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk, or optical disk, and causing a single computer device (which may be a personal computer, server, or network device, etc.) to perform the method described in the plurality of embodiments of the present application.

[0045] Those skilled in the art will understand that all or part of the processes in the above embodiments can be executed by directing the relevant hardware with a computer program, which can be stored in a non-volatile computer-readable storage medium and, at runtime, may include the processes of the multiple embodiments of the methods described above. Herein, any reference to memory, storage, database, or other medium used in the multiple embodiments provided in this disclosure may include non-volatile memory and / or volatile memory.

[0046] The embodiments described above are provided for illustrative purposes only.

[0047] The various embodiments described herein are described progressively, with each embodiment focusing on the differences from the others, and any identical or similar parts of each embodiment shall be referenced to one another.

[0048] The various technical features of the embodiments described above can be combined in any way, and while not all possible combinations are described for the sake of simplicity, they should be considered to fall within the scope of what is recorded herein, as long as they do not contradict each other. [Explanation of symbols]

[0049] 100: Trigger comparison unit 200: Controller 300: Delay Unit 400: Analog-to-Digital Converter 500: Trigger display unit 501: Waveform Processing Unit 502: Waveform plotting unit 503: Trigger Interpolation Unit 504: Trigger drawing unit 505: Waveform display unit

Claims

1. A signal processing device used in a digital oscilloscope, A trigger comparison unit (100) is configured to receive a trigger signal and extract at least one of a DC component signal or a low-frequency component signal below a predetermined frequency from the trigger signal by digital filtering, A controller (200) is electrically connected to the trigger comparison unit (100), which generates a trigger comparison signal by filtering out the extracted components from the trigger signal, acquires a peak signal based on the maximum and minimum values ​​of the trigger comparison signal, and selects and outputs a target signal according to a preset rule. A trigger display unit (500) is electrically connected to the controller (200) and configured to receive the target signal and display it on the target interaction interface, A signal processing device including, The aforementioned preset rules are: In a triggered state where the value corresponding to the amplitude of the trigger comparison signal is greater than or equal to the value corresponding to the amplitude of the trigger level, the target signal includes the peak signal and the trigger waveform, the trigger level is set to a value between the maximum value Vmax and the minimum value Vmin of the trigger comparison signal, and one trigger waveform is captured from the initial waveform. In a non-triggered state where the value corresponding to the amplitude of the trigger comparison signal is smaller than the value corresponding to the amplitude of the trigger level, the target signal includes the initial waveform which includes the peak signal and at least one trigger waveform. A signal processing device, including a signal processing device.

2. A delay unit (300) electrically connected to the controller (200), To compensate for the delay associated with the extraction process in the trigger comparison unit (100), the low-frequency component signal is moved in the time dimension together with the trigger signal. The signal processing apparatus according to claim 1, further comprising a delay unit (300) configured as follows.

3. The signal processing apparatus according to claim 2, wherein the peak signal includes at least one of the maximum value Vmax of the trigger comparison signal and the minimum value Vmin of the trigger comparison signal.

4. A digital oscilloscope including a signal processing device according to any one of claims 1 to 3.

5. A signal processing method used in a digital oscilloscope, A trigger signal is input, and at least one of a DC component signal or a low-frequency component signal below a predetermined frequency is extracted from the trigger signal by digital filtering. The steps include: generating a trigger comparison signal by filtering out the extracted components from the trigger signal, obtaining a peak signal based on the maximum and minimum values ​​of the trigger comparison signal, selecting and outputting a target signal according to a preset rule; The steps include receiving the target signal and displaying it on the target interaction interface, Includes, The aforementioned preset rules are: In a triggered state where the value corresponding to the amplitude of the trigger comparison signal is greater than or equal to the value corresponding to the amplitude of the trigger level, the target signal includes the peak signal and the trigger waveform, the trigger level is set to a value between the maximum value Vmax and the minimum value Vmin of the trigger comparison signal, and when the trigger is established, one trigger waveform is captured from the initial waveform. In a non-triggered state where the value corresponding to the amplitude of the trigger comparison signal is smaller than the value corresponding to the amplitude of the trigger level, the target signal includes the initial waveform which includes the peak signal and at least one trigger waveform. A signal processing method characterized by the following:

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