JP2008180615A - Observation display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an observation display device for generating thinning-out data having high utility values by thinning sample points at regular intervals. <P>SOLUTION: A digital oscilloscope 100 divides observation data at each prescribed several-n piece set in a memory 214 to each sample point of the observation data sampling an analog wave-form signal of a channel CH1, and successively assigns 1-n phases along a time base in each division. The digital oscilloscope modifies the phase from (2) to (n) to perform prescribed several-n different combinations of processing successively re-sampling sampling points corresponding to the phase from respective sections at each phase, displays them on a display unit 116 by generating prescribed n kinds of thinning data, and performs processing storing any thinning-out data selected by a user. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an observation display device that displays observation data obtained by sampling an observed event such as a voltage signal, and more particularly to a configuration for performing a process of thinning observation data.

  Conventionally, for example, a digital oscilloscope or the like displays observed data such as sample points obtained by sampling at a certain time interval while observing an observed event such as a voltage signal output from an electronic device or the like. The observation display device generates and displays a waveform on the screen by plotting the acquired sample points along the time axis. And when observing voltage signals etc. output from electronic devices with a high operating frequency, the number of sample points becomes tens of thousands or more, and the amount of work becomes enormous when performing statistical processing with a PC, Since there are cases where the processing cannot be completed due to the limitation on the number of rows of the spreadsheet software, the thinning process is performed by reducing the sample points to some extent.

The observation display device described in the following Patent Document 1 includes a pair of data thinning circuits and a pair of PP compression circuits, and displays a normal waveform on the screen at a low sampling speed, and has a high sampling speed. The data near the trigger point is acquired and saved, and the waveform data is also displayed on the same screen. If there is a shortage of data in the pre-trigger area due to continuous trigger points, copying between blocks to replenish the missing data prevents the trigger point from being ignored due to insufficient data. ing.
JP 2001-272420 A (FIG. 1)

  Further, in the conventional observation display device, the sample point thinning process given in the following example is performed, and the amount of work when performing statistics by reducing the number of huge sample points is reduced. FIG. 5 is an explanatory diagram showing a first method for thinning out the total number of data by re-sampling using Peak-to-Peak values. In this method, 2n pieces of continuous data using an integer value n is defined as one section, and the entire data of sample points is divided for each section. Then, Peak-to-Peak values in each of the divided sections, that is, two points of the maximum value and the minimum value are resampled for each section as representative values of the section, and the total number of data is reduced to 1 / Thinned data thinned out to n is generated.

  Next, FIG. 6 is an explanatory diagram showing a second method for thinning out the total number of data by simply resampling every n data. In this method, n pieces of continuous data using an integer value n are defined as one section, and the entire data of sample points is divided for each section. Then, the sample points in each of the divided sections are resampled for each section from the first to the nth, and n thinned data in which the total number of data is thinned to 1 / n is generated. Then, specific thinned-out data is selected from n patterns according to the preset contents.

  However, the method of the observation display device in such a conventional technique has the following problems. First, in the case of the first method of re-sampling using Peak-to-Peak values, it includes two points of the maximum value and the minimum value of each divided section, and represents the characteristics of the waveform of the entire data. Although there is an advantage that thinned data can be generated, the interval between resampled points is not constant. For this reason, there is a problem that it is difficult to use for subsequent processing such as time axis measurement using thinned data, FFT (Fast Fourier Transform) calculation, and calculation between channels of waveform data.

  Next, in the case of the second method in which every n samples are simply resampled, since the interval between the resampled points is constant, measurement of the time axis system, FFT calculation, calculation between channels of waveform data, etc. The processing after using the thinned data has an advantage that it is easy to use, but the thinned data does not necessarily include the maximum value or the minimum value of the waveform of the entire data. For this reason, depending on preset contents, thinning data representing the characteristics of the waveform of the entire data may not be selected.

  Therefore, an object of the present invention is to provide an observation display device capable of generating thinned data having high utility value by thinning sample points at equal intervals.

  In order to achieve the above-described problems, an observation display device according to the present invention includes observation data acquisition means for acquiring observation data including sample points obtained by sampling a signal obtained from an observed event, and the observation data acquisition means Resample the sample points included in the observation data acquired by the above, perform thinning processing, generate a plurality of types of thinned data, and a plurality of types of thinned data generated by the thinned data generation unit Of these, data selection means for selecting any one of the thinned data is provided.

  With this configuration, the sampling points included in the observation data are resampled by the thinning data generation means, and multiple types of thinning data are generated, so that the maximum value and minimum It is possible to acquire thinned data having high utility value by selecting thinned data including values and the like and thinned data that best represents the waveform characteristics of the entire data by the data selection means.

  Further, another observation display device according to the present invention includes observation data acquisition means for acquiring observation data including a sample point obtained by sampling a signal obtained from an observed event, and observation data acquired by the observation data acquisition means. Resampled every predetermined number of sample points included and thinned out by performing a predetermined number of times by sequentially changing the phase and generating a predetermined number of types of thinned data, and the thinning unit generated Thinning display means for displaying a predetermined number of types of thinned data, and data selection means for selecting one of the thinned data of the predetermined number of types displayed on the thinning display means. Features.

  With such a configuration, the thinning data generation means performs a predetermined number of sampling points by changing the phase in order by re-sampling every predetermined number of sample points included in the observation data, and sampling points at regular intervals. A predetermined number of types of thinned data is generated and displayed. Of these predetermined types of thinned data, the thinned data including the maximum value, the minimum value, etc., or the thinned data that best represents the characteristics of the waveform of the entire data is selected by the data selection means as required by the user. Therefore, it is possible to adopt thinned-out data with high utility value that can be used effectively for the subsequent processing.

  According to the observation display device of the present invention, in accordance with a user operation, the thinning data generation unit sets the number of thinnings by re-sampling sample points included in the observation data acquired by the observation data acquisition unit Means may be further provided.

  With such a configuration, the thinning number setting means resamples the sample points included in the observation data according to the user's operation, changes the number of thinning points, and the number according to the user's needs in the subsequent processing etc. Can be set to reduce to an appropriate amount of data including. Accordingly, it is possible to generate thinned data having high utility value corresponding to the data processing after sampling.

  The observation display device of the present invention further includes predetermined value selection means for selecting thinning data including a predetermined value obtained from the observation data among the predetermined number of types of thinning data generated by the thinning data generation means. good.

  With such a configuration, when the user needs thinning data including the maximum value, for example, the maximum value is automatically selected from the observation data by the predetermined value selection means, and a predetermined number of types of thinning data are selected. Therefore, such thinning data can be acquired efficiently. In addition to the maximum value, the minimum value in the observation data, the maximum difference between the maximum value and the minimum value of the thinned data (Peak-to-Peak value), or the minimum value is automatically selected. It may be a configuration.

  Furthermore, in the above-described observation display device, the observation data acquisition means may acquire waveform data including a sample point obtained by sampling a voltage signal. With such a configuration, it is possible to generate thinned data with high utility value by thinning sample points at equal intervals in waveform data obtained by sampling a voltage signal output from an electronic device or the like.

  According to the observation display device according to the present invention, it is possible to generate thinned data having high utility value by thinning sample points at equal intervals.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram illustrating a configuration example of a digital oscilloscope 100 that is an embodiment of an observation display device. Here, an electronic device or the like is an object to be measured, and an analog signal such as a voltage signal output from the electronic device is an example of an observed event. The digital oscilloscope 100 observes the signal from the observed event, performs sampling based on the sampling time and the number of samples at a certain time interval, and resamples every predetermined number of sample points included in the acquired observation data. Thus, it is a device that performs thinning display.

  FIG. 1 shows detailed components of the digital oscilloscope 100. Specifically, a time base 200 and a trigger circuit 202 are given for input of an analog signal or a digital signal. The time base 200 activates an A / D conversion process executed by the A / D converter 106 and designates a sampling period of the analog waveform signal of the channel CH1. The trigger circuit 202 outputs a trigger signal to the data processing circuit 108.

  The A / D converter 106 converts a sample point obtained by sampling the analog waveform signal obtained from the measurement target connected to the channel CH1 through the input circuit 102 into a digital signal according to the sampling period specified from the time base 200. Convert. The data processing circuit 108 stores data of the number of samplings preset by the CPU 202 in the acquisition memory 110. That is, in response to a trigger signal generated after storing the pre-trigger data in the acquisition memory 110, the post-trigger data is stored in the acquisition memory 110, and the capture is completed. Data corresponding to the number of samplings specified retroactively from the last acquired data becomes valid data. In addition, the data processing circuit 108 may perform a thinning process, a peak detection process at regular intervals, or the like before being stored in the acquisition memory 110.

  Although not shown in FIG. 1, when the observation data is transferred from the data processing circuit 108 to the display data processing circuit 112, secondary data processing is performed by the secondary data processing circuit or the like. In some cases, data may be temporarily stored in a memory, and this memory may be referred to as an acquisition memory. Further, such data processing may be transmitted to the display data processing circuit 112 in several stages and so-called pipeline processing. Further, there may be a function of displaying a waveform image on the display 116.

  The CPU 212 shown in FIG. 1 controls the data processing circuit 108 and the display data processing circuit 112 via the bus 210, and further controls access to the acquisition memory 110 and the display memory 114. The CPU 212 has a function of reading the observation data corresponding to the analog waveform signal input from the channel CH1 from the acquisition memory 110 and displaying the waveform image obtained by imaging the observed event on the display 116 based on the observation data. .

  In addition, the CPU 212 performs a predetermined number n of processes by changing the phase one after another by re-sampling each sample point included in the observation data stored in the acquisition memory 110 every predetermined number n. It has a function of generating several types of thinned data. The memory 214 stores in advance the number n of samples to be thinned by re-sampling the sample points in the thinning process in accordance with the user's operation of the keyboard 118. The CPU 212 resamples the sample points included in the observation data every predetermined number n set to the number to be thinned out, performs a predetermined number of thinning processes, and displays the result on the display 116.

  A built-in OS (operating system) is stored in the memory 214, and a platform as a microcomputer is built in the digital oscilloscope 100 by the CPU 212 executing the OS. Such a platform realizes communication with an external general-purpose personal computer or storage device through the interface circuit 216, thereby transferring and storing data stored in the acquisition memory 110 or the display memory 114 to the storage device. Or can be used on a personal computer. The interface circuit 216 corresponds to, for example, a high-speed serial communication or a network communication protocol such as a LAN.

  The operation input using the keyboard 118 described above is performed through the user interface circuit 204 in detail. The user interface circuit 204 also operates on a platform centered on the CPU 212. Using the keyboard 118, the user selects and operates one of the thinned data generated by the CPU 212 in accordance with subsequent processing such as time axis measurement or FFT calculation.

The above is the configuration of the digital oscilloscope 100. Next, an operation in which the user selects a predetermined number of types of thinned data generated by thinning the observation data of the digital oscilloscope 100 will be described with reference to the flowchart shown in FIG. Here, the acquisition memory 110 stores observation data of each sample point obtained by sampling the analog waveform signal of the channel CH1 by the data processing circuit 108, as shown in FIG. In the example shown in FIG. 3, sampling of an analog waveform signal is performed with a sampling frequency of fs, a sampling period of ts, and a time until a sample point immediately after the trigger point is t _T−S .

  Step S <b> 201: The CPU 212 controls the data processing circuit 108 to perform a process of dividing the observation data for every predetermined number n set in the memory 214. The observation data is read from the acquisition memory 110 by the data processing circuit 108, and each sample point along the time axis included in the observation data is sequentially counted from the trigger point, and a predetermined number n stored in the memory. The minutes are divided into predetermined intervals n for each interval.

  For example, when “5” is set as the predetermined number n in the memory 214, the CPU 212 counts each sample point along the time axis of the observation data from the trigger point as shown in FIG. Divide into 5 sections as one section.

  Step S202: The CPU 212 controls the data processing circuit 108 to perform a process of assigning phases to a predetermined number n of sample points in each section included in the observation data. Specifically, for each of a predetermined number n of sample points in each section divided in step S201 by the data processing circuit 108, the phases from 1 to n from the trigger point side are sequentially arranged along the time axis. Allocate to

For example, when “5” is set as the predetermined number n in the memory 214, the CPU 212 starts from 1 from the trigger point side with respect to five sample points in each section as shown in FIG. Allocate up to n phases in sequence. In the example shown in FIG. 3, phase 1 is assigned to the first sample point at time t _TS on the time axis from the trigger point in the first section included in the observation data. Then, on the time axis, the phase is set to the sample points of time (t _TS + ts), (t _T + _S + ts × 2), (t _T + _S + ts × 3), and (t _T−S + ts × 4), respectively. Allocate 2, 3, 4 and 5.

  Step S203: The CPU 212 controls the data processing circuit 108 to resample the sample points in each section included in the observation data every predetermined number n and perform thinning processing for each phase by a predetermined number n, A process of generating a predetermined number n of thinned data is performed. First, the sample points corresponding to the phase “1” assigned in step S202 by the data processing circuit 108 are resampled sequentially from the section on the trigger point side, and thinned every predetermined number n to obtain “phase” 1 "thinning data (a set of sample points) is generated. Subsequently, a predetermined number n of processes are performed for each phase by changing the phase from “2” to n and re-sampling the sample points corresponding to the phase in order from each section. Generate data. Since the predetermined number n of thinned data is data stored in the acquisition memory 110, it may be read from the acquisition memory 110 when used, or may be copied to another memory.

  For example, if “5” is set as the predetermined number n in the memory 214, the CPU 212 changes the phase from “1” to “5” as shown in FIG. Five kinds of thinning data are generated by re-sampling the points in order from each section in five ways for each phase. In the example shown in FIG. 4, the observation data of the sampling frequency fs and the sampling period ts are resampled every five pieces and thinned, and the sampling frequency fs ′ = fs / 5 and the sampling period ts ′ = ts × 5 thinned data. Can be generated.

  Step S204: The CPU 212 performs processing for generating image data in the display data processing circuit 112 based on the predetermined number n of thinned data and displaying the thinned waveform on the display 116.

  Step S205: The CPU 212 performs a process of storing any one of the thinned data selected by the user among the predetermined number n of thinned data displayed on the display 116. At this time, the user checks and confirms the predetermined number n of thinning data displayed on the display 116 and operates the keyboard 118. Alternatively, the user outputs a communication command and selects desired thinning data according to the conditions of subsequent processing such as time axis measurement, FFT calculation, and calculation between channels of waveform data. The CPU 212 reads the selected thinned data from the acquisition memory 110 and stores it in a recording medium (not shown), a storage unit for storing thinned data, a mass storage device on a network connected via the interface circuit 216, and the like.

  For example, as shown in FIG. 4, when five types of thinned data are displayed on the display 116, the user operates the keyboard 118 and thins the phase “1” according to the conditions of the subsequent processing. The CPU 212 reads out the thinned data of the phase “1” from the acquisition memory 110 and stores it in a recording medium (not shown), a storage unit for storing thinned data, a large-capacity storage device, and the like.

  As described above, the digital oscilloscope 100 according to the present embodiment divides the observation data for each predetermined number n set in the memory 214 with respect to each sample point of the observation data obtained by sampling the analog waveform signal of the channel CH1. Then, phases from 1 to n are sequentially allocated along the time axis in each divided section. Then, a predetermined number n of processes are performed for each phase by changing the phase from “2” to “n” and re-sampling the sample points corresponding to the phase in order from each section. Data is generated and displayed on the display 116, and a process of storing any thinned data selected by the user is performed.

  For this reason, the sample points included in the observation data are resampled, the phases corresponding to the number to be thinned out are changed, and plural types of thinned data in which the sample points are thinned out at equal intervals are generated and displayed on the display 116. In addition, the user can check each thinned data and confirm appropriate thinning such as thinned data including the maximum and minimum values and thinned data that best represents the waveform characteristics of the entire data. Data can be selected, and thin data with high utility value that can be used effectively in later processing can be acquired.

  In this way, for example, an unknown waveform is sampled at high speed (mass data), then sampled and thinned out by re-sampling it to the number of required data while retaining the original waveform characteristics as much as possible It becomes possible to save. In addition, since the data after thinning can be handled as independent waveform data, it is handled in exactly the same way as when the waveform was taken in at the sample rate after the original thinning (the waveform data (Normal operation such as automatic measurement, FFT calculation, and time-axis enlarged display) is possible, and its utility value is extremely high.

  In addition, when the user operates the keyboard 118 and changes and sets the number n to be thinned in the thinning process in advance in the memory 214, the number of sample points according to the user's needs is included in the subsequent processing. Settings can be made to reduce the amount of data to an appropriate level.

[Other Embodiments]
In the above-described embodiment, the CPU 212 automatically selects thinning data including a predetermined value such as the maximum value of the voltage in the observation data, among the predetermined number n types of thinning data displayed on the display 116. However, the storing process may be performed. By performing such processing, when the user needs thinning data including the maximum value of the observation data, the thinning data is efficiently selected from a predetermined number of types of thinning data by automatically selecting. Can be acquired. In addition to the maximum value, the predetermined value obtained from the observation data is the minimum value, the maximum value of the difference between the maximum value and the minimum value of the thinned data (Peak-to-Peak value), or the minimum value It is also possible to adopt a configuration that allows automatic selection such as.

  In the above-described embodiment, after the predetermined number n types of thinned data are displayed on the display 116 in step S204 in FIG. 2, the user operates the keyboard 118 while checking the display 116 to store the data in the memory 214. The processing of steps S201 to S204 is repeatedly executed according to the numerical value of the thinning number n being sequentially changed and set, and the degree of thinning (thinning rate) can be adjusted while looking at the thinning data displayed on the display 116. There may be.

  In the above-described embodiment, the user previously sets a predetermined numerical value range in the memory 124, and the CPU 212 sets the predetermined predetermined numerical value among the predetermined number n of thinned data displayed on the display 116. A process of automatically detecting, selecting, and storing thinned data having waveforms with overlapping ranges may be performed.

  In addition, since the n types of thinned data after re-sampling can be handled as independent waveform data without the user performing a selection operation, the thinned target to be saved using the automatic measurement function of the digital oscilloscope 100 is used. Data can be selected automatically. For example, using the automatic measurement result of the waveform parameter for each of n thinning data, a process of obtaining the maximum value of a certain section for each waveform, and selecting and saving the one having the maximum value. It is feasible.

  Alternatively, by accumulating the thinned data obtained by re-sampling in the acquisition memory 110, whether or not the waveform represented by each of the n kinds of independent thinned data passes through a certain range, Alternatively, candidates are narrowed down using conditions such as whether or not the value of the waveform parameter is within a certain range, and the user selects and automatically selects the optimum waveform from among them. Usage is also possible.

  Further, for example, when the digital oscilloscope 100 has an automatic measurement function of waveform parameters, by using this function, it is possible to always select a waveform including the maximum value in the section even if the number of n is increased. is there. In this case, the waveform of the phase including the maximum value is always displayed every time the decimation rate is changed. It is possible to use it by selecting the thinning rate while visually confirming whether or not it will collapse.

It is explanatory drawing which shows the structure of the observation display apparatus of this embodiment. It is a flowchart which shows operation | movement of the observation display apparatus of this embodiment. It is explanatory drawing which shows the observation data of the observation display apparatus of this embodiment. It is explanatory drawing which shows the thinning data produced | generated by the observation display apparatus of this embodiment. It is explanatory drawing which shows the thinning data of the 1st method produced | generated with the observation display apparatus of the prior art. It is explanatory drawing which shows the thinning data of the 2nd method produced | generated with the observation display apparatus of the prior art.

Explanation of symbols

100 digital oscilloscope 102 input circuit 106 A / D converter 108 data processing circuit 110 acquisition memory 112 display data processing circuit 114 display memory 116 display 118 keyboard 200 time base 202 trigger circuit 204 user interface circuit 210 bus 212 CPU
214 Memory 216 Interface circuit

Claims (5)

Observation data acquisition means for acquiring observation data including a sample point obtained by sampling a signal obtained from an observed event;
Thinning data generating means for performing a thinning process by resampling sample points included in the observation data acquired by the observation data acquiring means, and generating a plurality of types of thinned data;
An observation display device comprising: data selection means for selecting any one of the thinned data generated by the thinned data generating means. Observation data acquisition means for acquiring observation data including a sample point obtained by sampling a signal obtained from an observed event;
A predetermined number of types of thinned data are generated by performing a predetermined number of steps by sequentially changing the phase and thinning out a predetermined number of sample points included in the observation data acquired by the observation data acquisition means. Thinning data generation means;
Thinning display means for displaying a predetermined number of types of thinning data generated by the thinning means;
An observation display device comprising: data selection means for selecting any one of the thinned data of a predetermined number of types displayed on the thinned display means. The observation display device according to claim 2,
The thinning data generation means further comprises thinning number setting means for setting the number to be thinned by resampling sample points included in the observation data acquired by the observation data acquisition means in accordance with a user operation. An observation display device. In the observation display device according to claim 2 or 3,
An observation display device further comprising predetermined value selection means for selecting thinned data including a predetermined value obtained from the observation data among the predetermined number of types of thinned data generated by the thinned data generation means. In the observation display device according to any one of claims 1 to 4,
The observation data acquisition means includes
An observation display device characterized by acquiring waveform data including a sampling point obtained by sampling a voltage signal.

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