JP5484918B2 - Waveform display device and waveform display method - Google Patents

Description

  The present invention relates to a waveform display device and a waveform display method for displaying a plurality of signal waveforms superimposed on a waveform display region.

  As a waveform display device for displaying a signal waveform in a waveform display region according to this type of waveform display method, a waveform display device configured to display a plurality of measurement system measurement waveforms on the same screen is disclosed in Japanese Patent Laid-Open No. 2000-35448. It is disclosed in the gazette. In this waveform display device, twelve measurement waveforms are superimposed and displayed in a waveform display area defined in the display screen, and a display bar for individually selecting a waveform of interest is displayed corresponding to each measurement waveform. The operation area is defined on the right side of the waveform display area. Further, in this waveform display device, for example, by selecting a display bar corresponding to the measurement waveform of channel number 1, the measurement waveform of channel number 1 is displayed in the forefront in the waveform display region, and the measurement waveform of channel number 12 is displayed. A configuration is adopted in which the measurement waveform of channel number 12 is displayed in the forefront in the waveform display area by selecting the corresponding display bar. Thereby, it is possible to observe in detail in a state where a desired measurement waveform is displayed in the foreground.

Japanese Unexamined Patent Publication No. 2000-35448 (page 2-3, FIG. 1-2)

  However, the conventional waveform display device has the following problems. In other words, the conventional waveform display device employs a configuration in which the measurement waveform (signal waveform) associated with the selected display bar is displayed on the foreground. In this case, when a plurality of signal waveforms are displayed by this type of waveform display device, as shown in the right diagram of FIG. 7, the signal waveform W1 having a small amount of change (having a long period and / or an amplitude level). A small signal waveform (see the left figure) and a signal waveform W2 with a large amount of change (a signal waveform with a short period and / or a large amplitude level: see the central figure) may be displayed in an overlapping manner. In such an example, when the signal waveform W2 is displayed so as to overlap the signal waveform W1, the signal waveform W1 is obscured by the signal waveform W2, and the signal waveform W1 becomes almost invisible. Therefore, there is a possibility that it cannot be recognized that the signal waveform W1 is displayed in the waveform display area.

  In this case, in the conventional waveform display device, the measurement waveform (signal waveform) associated with the selected display bar can be displayed in the foreground, but the corresponding display bar is not selected. ) Are displayed in the order of channel numbers or in the order of selection of display bars in the past. Therefore, in the conventional waveform display device, when three or more signal waveforms having different amounts of change are displayed in a superimposed manner, the other signal waveforms may be obscured to reduce their visibility. In order to display the “mostly signal waveform” on the back side, it is necessary to sequentially select all of the multiple display bars associated with multiple signal waveforms other than the “signal waveform with the largest amount of change”. There is a problem that this selection operation is very complicated.

  On the other hand, it is also conceivable to adopt a configuration in which a plurality of signal waveforms are arranged and displayed individually without overlapping. However, in such a configuration, the display area per signal waveform is narrowed, and as a result, reading of each signal waveform may be difficult. In addition, since it is necessary to individually set which signal waveform is to be displayed at what display position at what display magnification, there is a problem that this setting operation is complicated.

  The present invention has been made in view of such problems, and a main object of the present invention is to provide a waveform display device and a waveform display method that can improve the visibility of a signal waveform with a small amount of change.

In order to achieve the above object, the waveform display device according to claim 1 is a waveform display device including a control unit that displays a plurality of signal waveforms in a waveform display region, wherein the control unit displays the waveform display. Display of each signal waveform for the first time corresponding to one of the unit display areas defined in a plurality along the time axis direction in the entire waveform display area and the time axis direction. Each of the required number of pixels is specified, and a signal waveform having a larger amount of change in the display range corresponding to the first time in the waveform display region as a signal waveform having a larger number of specified pixels is set in the display range. The signal waveforms are displayed in an overlapping manner within the display range so that the signal waveform with the largest amount of change is displayed on the back side most.

The waveform display device according to claim 2 is a waveform display device including a control unit that displays a plurality of signal waveforms superimposed on the waveform display region , wherein the control unit includes the entire region of the waveform display region, and Within a time shorter than the first time corresponding to any one of the unit display areas defined side by side along the time axis direction in the waveform display area , and within the first time The total value of the absolute value of the signal level change amount of each of the signal waveforms in the continuous second time is specified, and the signal waveform having a larger specified total value is the first time in the waveform display region. as the amount of change is large signal waveforms in the display range corresponding to, in within the display range such that the variation in within the display range are most often the signal waveform displayed on the rearmost side Is displayed superimposed a respective signal waveforms.

The waveform display device according to claim 3 is a waveform display device including a control unit that displays a plurality of signal waveforms superimposed on the waveform display region , wherein the control unit includes the entire region of the waveform display region, and A predetermined signal level in which each signal waveform is defined in advance in a first time corresponding to one of the unit display areas defined in a plurality along the time axis direction in the waveform display area. And the total number of times the specified signal level is exceeded , respectively, and the signal waveform having a larger specified number is within the display range corresponding to the first time in the waveform display region . as the amount of change is large signal waveforms, each such within the display range such that the variation in within the display range are most often the signal waveform displayed on the rearmost side It is displayed superimposed No. waveform.

The waveform display device according to claim 4 is a waveform display device including a control unit that displays a plurality of signal waveforms superimposed on the waveform display region , wherein the control unit includes the entire region of the waveform display region, and Period and / or signal level change of each signal waveform within a first time corresponding to any one of the unit display areas defined in parallel along the time axis direction in the waveform display area with identifying quantities respectively, as the amount of change is large signal waveforms in the display range corresponding to the first time in the waveform display area the more shorter and / or signal level change amount specified period, the display range In the display range, the signal waveforms are overlapped and displayed so that the signal waveform having the largest change amount is displayed on the back side.

Further, in the waveform display device according to claim 5, in the waveform display device according to any one of claims 1 to 4 , the control unit displays the signal waveform with the smallest amount of change on the most front side. As described above, the respective signal waveforms are displayed in an overlapping manner within the display range.

Furthermore, the waveform display device according to claim 6 is the waveform display device according to claim 5 , wherein the control unit displays the signal waveforms in an overlapping manner in the display range in order from the signal waveform having the large amount of change. Let

Furthermore, the waveform display device according to claim 7 is the waveform display device according to any one of claims 1 to 6, wherein the control unit sets the time corresponding to the unit display area as the first time. when displaying superimposed signal waveform, said to identify the amount of change in a plurality of said within the first time period corresponding to a plurality of the unit display region of the waveform display area on the respective unit display each area Define the order in which each signal waveform is superimposed.

Furthermore, the waveform display device according to claim 8 is the waveform display device according to claim 7, wherein the control unit includes a plurality of the signal waveforms having the same amount of change within the first time. In the unit display area corresponding to the first time, the order equal to the order in which the signal waveforms are superimposed in the unit display area corresponding to the other first time immediately before the first time. The signal waveforms having the same amount of change are displayed in an overlapping manner.

The waveform display method according to claim 9 is a waveform display method for displaying a plurality of signal waveforms in an overlapping manner in the waveform display area, and the entire waveform display area and the waveform display area in the time axis direction. The number of pixels required for display of each of the signal waveforms for the first time corresponding to one of the unit display areas defined side by side in advance is specified, and the specified number of pixels is The signal waveform having the largest amount of change in the display range is displayed on the back side as the signal waveform having a larger amount of change in the display range corresponding to the first time in the waveform display region as the signal waveform is larger. As shown, the signal waveforms are displayed in an overlapping manner within the display range.

The waveform display method according to claim 10 is a waveform display method for displaying a plurality of signal waveforms in an overlapping manner in the waveform display area, and the entire waveform display area and the waveform display area in the time axis direction. Each of the unit display areas defined side by side in a short time than the first time corresponding to one of the unit display areas defined in advance and within a second time continuous within the first time. The total value of the absolute value of the signal level change amount of the signal waveform is specified, and the change amount in the display range corresponding to the first time in the waveform display region is larger for the signal waveform having a larger specified total value. as many signal waveform displayed superimposed the signal waveforms within the display range such that the variation in within the display range are most often the signal waveform displayed on the rearmost side To.

The waveform display method according to claim 11 is a waveform display method for displaying a plurality of signal waveforms in an overlapped manner in the waveform display area, and the entire waveform display area and the waveform display area in the time axis direction. The number of times that each of the signal waveforms has fallen below a predetermined signal level and a predetermined signal level within a first time corresponding to one of the unit display areas defined side by side along the predetermined number. The total number of times of exceeding is specified, and the signal waveform having a larger change amount in the display range corresponding to the first time in the waveform display region is displayed as the signal waveform having a larger specified total number. Each signal waveform is overlapped and displayed in the display range so that the signal waveform having the largest amount of change in the range is displayed on the most back side.

The waveform display method according to claim 12 is a waveform display method for displaying a plurality of signal waveforms in an overlapping manner in the waveform display area, and the entire waveform display area and the waveform display area in the time axis direction. The period and / or signal level change amount of each of the signal waveforms in the first time corresponding to one of the unit display areas defined side by side along a predetermined one are specified, and the specified period The signal having the largest amount of change in the display range as a signal waveform having a larger amount of change in the display range corresponding to the first time in the waveform display area as the signal level is shorter and / or the signal level change amount is larger. Each signal waveform is displayed in an overlapping manner within the display range so that the waveform is displayed on the most back side.

The waveform display method according to claim 13 is the waveform display method according to any one of claims 9 to 12 , wherein the display range is such that the signal waveform with the smallest amount of change is displayed on the foremost side. The signal waveforms are displayed in an overlapping manner.

Furthermore, the waveform display method according to claim 14 is the waveform display method according to claim 13 , wherein the signal waveforms are displayed in an overlapping manner in the display range in order from the signal waveform having the large amount of change.

The waveform display method according to claim 15 is the waveform display method according to any one of claims 9 to 14, wherein the signal waveforms are overlapped with the time corresponding to the unit display area as the first time. when displaying, overlaying a plurality of the first of the signal waveforms to identify and to the respective unit display each area the amount of change in time corresponding to the plurality of the unit display region of the waveform display area Specify the order.

Furthermore, the waveform display method according to claim 16 is the waveform display method according to claim 15, wherein when the plurality of signal waveforms having the same amount of change within the first time are present, In the unit display area corresponding to the time, the amount of change is in the same order as the order in which the signal waveforms are overlaid in the unit display area corresponding to the first time immediately before the first time. Each signal waveform that is equal to each other is displayed in an overlapping manner.

According to the waveform display device according to any one of claims 1 to 4 and the waveform display method according to claims 9 to 12, the signal waveform having the largest amount of change within the display range corresponding to the first time in the waveform display region is the most. It is necessary to perform multiple complicated operations to display the “signal waveform with the largest amount of change” on the back side by displaying each signal waveform in the display range so that it is displayed on the back side. Unlike the conventional waveform display device and its waveform display method, the “signal waveform with the largest amount of change” is displayed on the back side. It is possible to reliably and easily avoid the situation where the “small signal waveform” is obscured and sufficiently improve the visibility of the “signal waveform with a small amount of change”.

The waveform display apparatus according to claim 1, and according to the waveform display method according to claim 9, wherein the amount of change as the first time period a large number of pixels signal waveforms required for the display is large (i.e., the number of pixels By specifying that the smaller the signal waveform, the smaller the amount of change), the larger the number of pixels required for display, the higher the possibility that the visibility of other signal waveforms displayed on the back side of the signal waveform will be impaired. Is identified as a “signal waveform with a large amount of change” and is displayed on the back side of other signal waveforms, and the number of pixels required for display is small, so that other signals displayed on the back side of the signal waveform are displayed. A signal waveform that is less likely to impair the visibility of the waveform is identified as a “signal waveform with a small amount of change” and reliably improves the visibility of signal waveforms that are displayed on the front side of other signal waveforms with less change. Can be made.

The waveform display apparatus according to claim 2, and according to the waveform display method according to claim 10, wherein, in the first time, the signal level variation in the first second in the second time even for a short time than the time By specifying that a signal waveform with a larger absolute value of the signal has a larger amount of change (that is, a signal waveform with a smaller total value has a smaller amount of change), the cycle is short and / or the amplitude value is large. A signal waveform that is likely to impair the visibility of other signal waveforms displayed on the back side of the signal waveform is identified as `` signal waveform with a large amount of change '' and displayed on the back side, and the cycle is long. And / or a signal waveform that is less likely to impair the visibility of other signal waveforms displayed on the back side of the signal waveform due to a small amplitude value is identified as a “signal waveform with a small amount of change” and the front side Will be displayed in It is possible to reliably improve the visibility of a low degree of signal waveforms.

Number The waveform display apparatus according to claim 3, and according to the waveform display method according to claim 11, wherein, in the first time, which exceeds the number and prescribed signal level below a predefined prescribed signal level By specifying that a signal waveform with a larger total number has a larger amount of change (that is, a signal waveform with a smaller total number has a smaller amount of change), the cycle is shorter, and the signal waveform is displayed on the back side of the signal waveform. A signal waveform that is likely to impair the visibility of the signal waveform is identified as a `` signal waveform with a large amount of change '' and displayed on the back side, and because the period is long, it is displayed on the back side of the signal waveform. Signal waveforms that are less likely to impair the visibility of other signal waveforms are identified as “Signal waveforms with a small amount of change” and displayed on the front side, ensuring improved visibility of signal waveforms with a small amount of change. Letting It can be.

According to the waveform display device according to claim 5 and the waveform display method according to claim 13 , each signal waveform is overlapped and displayed in the display range so that the signal waveform with the smallest amount of change is displayed on the front side. By doing so, other signal waveforms do not overlap with the “signal waveform with the least amount of change”, so the visibility of the “signal waveform with the least amount of change” can be sufficiently improved. it can.

According to the waveform display device according to claim 6 and the waveform display method according to claim 14 , by displaying each signal waveform in an overlapping manner within a display range in order from a signal waveform having a large amount of change, a “change amount is small”. Since a signal waveform having a larger change amount than the signal waveform is not displayed on the “signal waveform”, the visibility of the “signal waveform having a small change amount” can be sufficiently improved.

According to the waveform display device according to claim 7 and the waveform display method according to claim 15 , when each signal waveform is overlapped and displayed with the time corresponding to the unit display area as the first time, the waveform display area The amount of change in each signal waveform is determined by identifying the amount of change within a plurality of first times corresponding to each of the plurality of unit display areas and defining the order in which the signal waveforms are superimposed for each unit display area. Even when the display area is changing, the signal waveform with a small amount of change is superimposed on the signal waveform with a large amount of change for each unit display area. The visibility of the signal waveform can be improved.

According to the waveform display device according to claim 8 and the waveform display method according to claim 16, when there are a plurality of signal waveforms having the same amount of change in the first time, the first time is handled. In the unit display area , the signal waveforms having the same amount of change are superimposed in the same order as the order in which the signal waveforms are superimposed in the unit display area corresponding to the other first time immediately before the first time. By displaying, each signal waveform can be continuously read along the time axis direction under the same conditions as the viewing conditions read in the other unit display area immediately before. As a result, the signal waveform can be read even in the unit display area with the same amount of change. Can be read reliably and easily.

2 is a block diagram showing a configuration of a waveform display device 1. FIG. 4 is a display screen diagram illustrating an example of a signal waveform display screen 10. FIG. 5 is a flowchart of a waveform display process 50. FIG. 3 is an enlarged display screen view in which a part of unit display areas A1 and A4 in a waveform display area 11 of the signal waveform display screen 10 shown in FIG. 2 is enlarged. It is explanatory drawing for demonstrating the variation | change_quantity of signal waveform Wa, Wb. It is explanatory drawing for demonstrating the variation | change_quantity of other signal waveform Wa, Wb. It is explanatory drawing for demonstrating the display of signal waveform W1, W2.

  Hereinafter, embodiments of a waveform display device and a waveform display method will be described with reference to the accompanying drawings.

  A waveform display device 1 shown in FIG. 1 includes a measurement unit 2, an operation unit 3, a display unit 4, a control unit 5, and a storage unit 6. Signal waveforms W1, W2 (FIG. 2) are displayed on the display unit 4 according to a waveform display method described later. Reference) etc. can be displayed. The waveform display device 1 can display a plurality of signal waveforms of three or more, but in order to facilitate understanding of the waveform display method, two signal waveforms W1 and W2 (hereinafter referred to as distinction). An example in which “signal waveform W” is displayed when not performed will be described below.

  For example, the measurement unit 2 includes a plurality of measurement channels, and measures electrical parameters (for example, voltage values) for the input signals Si1 and Si2 according to the control of the control unit 5 (a preset sampling period). The measurement data D 1 and D 2 (waveform data) are generated and the generated measurement data D 1 and D 2 are output to the control unit 5. The electrical parameter for displaying the “signal waveform” is not limited to the voltage value, and a configuration and a method for displaying the signal waveform for various parameters such as current value and phase can be employed. In this case, in the waveform display device 1, the time corresponding to the sampling period set for the measurement unit 2 (as an example, an arbitrary time between 50 nsec and 100 μsec) is “from the first time. Corresponds to a short second time ”.

  The operation unit 3 performs various operations such as an operation switch for setting the operating condition of the waveform display device 1 and a start switch and a stop switch for starting / ending the recording of the measurement data D1, D2 and the display of the signal waveform W. A switch (not shown) is provided, and an operation signal S1 corresponding to these operations is output to the control unit 5. The display unit 4 includes a liquid crystal display panel as an example, and an operation condition setting screen (not shown) for setting the operation conditions of the waveform display device 1 based on the display signal S2 output from the control unit 5. ) Or a signal waveform display screen 10 (see FIG. 2) for displaying the signal waveform W. In this case, as shown in FIG. 2, the signal waveform display screen 10 defines a waveform display area 11 for displaying the signal waveform W. The waveform display area 11 has a time axis corresponding to the horizontal direction, In addition, the signal waveform W is displayed with the signal level (in this example, the voltage value level) corresponding to the vertical direction orthogonal to the horizontal direction.

  Further, on the signal waveform display screen 10, there are ten areas (“display range”) of the unit display areas A 1 to A 10 (hereinafter also referred to as “unit display area A” when not distinguished) in the waveform display area 11. (Example) is defined side by side along the time axis direction (left and right direction). As will be described later, when the signal waveform W is displayed, the control unit 5 changes the amount of change in the signal waveform W for each unit display area A. The order in which the signal waveforms W are specified and specified is defined. In this case, in each unit display area A, according to the display magnification set for the waveform display area 11, for example, an arbitrary time between 5 μs and 5 minutes (for example, 100 μs: “first The signal waveform W is displayed in association with an example of “time of 1”. In the actual signal waveform display screen 10, various information display areas other than the above-described waveform display area 11 are defined, and various information related to the signal waveform W is displayed. In order to facilitate understanding of the waveform display method and the waveform display method, illustration and description thereof are omitted.

  The control unit 5 comprehensively controls the waveform display device 1. Specifically, the control unit 5 controls the measurement unit 2 according to the operation signal S1 from the operation unit 3 to measure the input signals Si1 and Si2 (sample the input signals Si1 and Si2 and measure the measurement data D1. , D2 is generated). Further, the control unit 5 stores the measurement data D1 and D2 output from the measurement unit 2 in the storage unit 6 and executes the waveform display processing 50 shown in FIG. 3 to display the signal waveform W. The signal waveform W is displayed on the signal waveform display screen 10 (waveform display area 11) by generating the signal S2 and outputting it to the display unit 4. The storage unit 6 stores measurement data D1 and D2, an operation program of the control unit 5, and the like.

  Next, display processing (waveform display method) of the signal waveform W by the waveform display device 1 will be described with reference to the accompanying drawings.

  In the waveform display device 1, when the start switch of the operation unit 3 is operated and the operation signal S1 is output, the control unit 5 controls the measurement unit 2 to start the measurement process. At this time, the measurement unit 2 converts the input signals Si1 and Si2 into digital data, samples the digital signal at a set time interval, generates measurement data D1 and D2, and controls the generated measurement data D1 and D2. Output to unit 5. In response to this, the control unit 5 sequentially stores the measurement data D1 and D2 output from the measurement unit 2 in the storage unit 6. The control unit 5 executes a waveform display process for displaying the signal waveforms W1, W2 based on the measurement data D1, D2 on the display unit 4 in parallel with the storage process of the measurement data D1, D2. In the waveform display process executed in parallel with the measurement process by the measurement unit 2, for example, the control unit 5 superimposes the signal waveform W2 based on the measurement data D2 on the signal waveform W1 based on the measurement data D1. It is displayed in the waveform display area 11 (not shown).

  On the other hand, when the signal waveforms W1 and W2 based on the measurement data D1 and D2 in the storage unit 6 are displayed in a state where a series of measurement processes by the measurement unit 2 is completed, a predetermined operation switch in the operation unit 3 is operated. To do. At this time, the control unit 5 starts the waveform display process 50 shown in FIG. 3 in response to the operation signal S 1 from the operation unit 3. In the waveform display processing 50, the control unit 5 first specifies the amount of change in the signal waveforms W1, W2 for each of the unit display areas A1 to A10 on the signal waveform display screen 10 based on the measurement data D1, D2. ). Specifically, as an example, the control unit 5 is required to display the number of pixels required for displaying the signal waveform W1 for 100 μsec and the signal waveform W2 for 100 μsec that are associated with each unit display area A. The number of pixels is specified for each of the unit display areas A1 to A10.

  Next, the control unit 5 changes the amount of change in the signal waveform W1 (in this example, the number of pixels required to display the signal waveform W1) and the amount of change in the signal waveform W2 (in this example, the number of pixels required to display the signal waveform W2). (Step 52). At this time, the unit display area A in which the change amount of the signal waveform W2 is larger than the change amount of the signal waveform W1 (the unit display area A in which the change amount of the signal waveform W1 is smaller than the change amount of the signal waveform W2). In the unit display area A, the control unit 5 generates a display signal S2 so that the signal waveform W1 is displayed on the signal waveform W2 and outputs it to the display unit 4 (step 53). Then, the waveform display processing 50 for the unit display area A is terminated. Thereby, as in the unit display areas A1 to A3 and A8 to A10 shown in FIG. 2, the change amount is small (pixels required for display) on the signal waveform W2 having a large change amount (a large number of pixels required for display). The signal waveform W1 (with a small number) is displayed in an overlapping manner.

  In this case, as shown in the left diagram of FIG. 4, the signal waveform W1 having a small amount of change is displayed on the signal waveform W2 having a large amount of change so that the signal waveform W1 is visually recognized by the signal waveform W2. The hindrance is avoided. Further, the signal waveform W2 having a large amount of change does not cause a situation in which the visibility is greatly deteriorated even when the signal waveform W1 having a small amount of change is displayed on the signal waveform W1. Therefore, it becomes possible to fully recognize both the signal waveforms W1 and W2.

  On the other hand, for the unit display area A in which the change amount of the signal waveform W1 is larger than the change amount of the signal waveform W2 (unit display area A in which the change amount of the signal waveform W2 is smaller than the change amount of the signal waveform W1). In the unit display area A, the control unit 5 generates the display signal S2 so that the signal waveform W2 is displayed on the signal waveform W1 and outputs it to the display unit 4 (step 54). The waveform display processing 50 for the unit display area A is terminated. As a result, as in the unit display areas A4 to A7 shown in FIG. 2, the amount of change is small (the number of pixels required for display is small) on the signal waveform W1 that has a large amount of change (the number of pixels required for display is large). The signal waveform W2 is displayed overlapping.

  In this case, as shown in the right diagram of FIG. 4, the signal waveform W2 having a small amount of change is displayed on the signal waveform W1 having a large amount of change so that the signal waveform W2 is visually recognized by the signal waveform W1. The hindrance is avoided. Further, the signal waveform W1 having a large amount of change does not cause a situation in which the visibility is greatly deteriorated even when the signal waveform W2 having a small amount of change is superimposed on the signal waveform W2. Therefore, it becomes possible to fully recognize both the signal waveforms W1 and W2.

  Further, the unit display area A in which the change amount of the signal waveform W1 and the change amount of the signal waveform W2 are equal (in this example, the unit display area A having the same number of pixels required for display: “the change amounts in the first time are mutually For an example of “when there are a plurality of equal signal waveforms”, the control unit 5 firstly selects a unit display area A (in this example, corresponding to another time immediately before the time corresponding to the unit display area A). In the unit display area A) adjacent to the left of the target unit display area A, the order in which both signal waveforms W1 and W2 are overlapped is specified (step 55). Next, the control unit 5 generates a display signal S2 so that the signal waveforms W1 and W2 are displayed in the specified order and outputs them to the display unit 4 (steps 53 and 54). The waveform display processing 50 is finished. As a result, the signal waveforms W1 and W2 having the same amount of change are displayed with the order of overlap in the unit display area A immediately before being maintained (not shown).

  On the other hand, the waveform display device 1 is configured to be able to display not only two signal waveforms W1 and W2 but also three or more signal waveforms W in the waveform display region 11 in a superimposed manner as described above. ing. As an example, when four signal waveforms W are displayed in the waveform display area 11, the control unit 5 performs each unit display area A in the same manner as the waveform display processing 50 executed when the signal waveforms W1 and W2 are displayed. The amount of change of the four signal waveforms W is specified every time, and the signal waveform W with the largest amount of change is displayed on the back side, and the signal waveform W with the smallest amount of change is displayed on the front side. Then, four signal waveforms W are superimposed and displayed in the unit display area A in order from the signal waveform W having a large amount of change (not shown).

  As described above, according to the waveform display device 1 and the waveform display method by the waveform display device 1, the signal waveform W having the largest amount of change in the unit display area A in the waveform display area 11 is displayed on the rearmost side. As described above, it is necessary to perform a plurality of complicated operations so that the “signal waveform W having the largest amount of change” is displayed on the back side by displaying the signal waveforms W in the unit display area A so as to overlap each other. Unlike the conventional waveform display device and its waveform display method, the “signal waveform W with the largest amount of change” is displayed on the back side. It is possible to reliably and easily avoid the situation where the “small signal waveform W” is obscured and sufficiently improve the visibility of the “signal waveform W with a small amount of change”.

  Further, according to the waveform display device 1 and the waveform display method by the waveform display device 1, each signal waveform W is displayed in the unit display area A so that the signal waveform W with the smallest amount of change is displayed on the front side. By displaying them in a superimposed manner, the other signal waveforms W are not displayed on top of the “signal waveform W with the least amount of change”, so the visibility of the “signal waveform W with the least amount of change” is improved. It can be improved sufficiently.

  Further, according to the waveform display device 1 and the waveform display method by the waveform display device 1, each signal waveform W is displayed in the unit display area A in order from the signal waveform W having the largest change amount, thereby displaying “changes”. Since the signal waveform W having a larger amount of change than the signal waveform W is not displayed on the “signal waveform W having a small amount”, the visibility of the “signal waveform W having a small amount of change” is sufficiently high. Can be improved.

  Further, according to the waveform display device 1 and the waveform display method by the waveform display device 1, the signal waveform W changes as the number of pixels required for displaying the time corresponding to the unit display area A (first time) increases. Other signal waveforms displayed on the back side of the signal waveform W by specifying that the amount is large (that is, the amount of change in the signal waveform W is small as the number of pixels is small). The signal waveform W that is likely to impair the visibility of W is identified as “a signal waveform W having a large amount of change” and is displayed on the back side of the other signal waveforms W, and the number of pixels required for display is small. Thus, the signal waveform W that is less likely to impair the visibility of the other signal waveform W displayed on the back side of the signal waveform W is identified as the “signal waveform W with a small amount of change” and is more than the other signal waveform W. The amount of change displayed on the front side is also small. It is possible to reliably improve the visibility of the signal waveform W.

  Furthermore, according to the waveform display device 1 and the waveform display method by the waveform display device 1, in a state in which a plurality of unit display areas A are displayed in the waveform display area 11 in parallel along the time axis direction. By specifying the amount of change within a plurality of times (first times) respectively corresponding to the plurality of unit display areas A and defining the order in which the signal waveforms W are overlapped for each unit display area A, each signal Even in a state where the change amount of the waveform W is changed in the waveform display region 11, the “signal waveform W having a small change amount” is superimposed on the “signal waveform W having a large change amount” for each unit display region A. Therefore, the visibility of the signal waveform W can be improved in the entire waveform display area 11.

  Further, according to the waveform display device 1 and the waveform display method by the waveform display device 1, there are a plurality of signal waveforms W having the same amount of change in time (within the first time) corresponding to the unit display area A. In the unit display area A corresponding to the first time, the order in which the signal waveforms W are overlaid in the unit display area A corresponding to the other first time immediately before the first time, By displaying each signal waveform W having the same change amount in the same order in an overlapping manner, each signal waveform W is continuously read along the time axis direction under the same condition as the viewing condition read in the other unit display area A immediately before. As a result, the signal waveform W can be reliably and easily read even in the unit display area A having the same amount of change.

  Note that the signal waveform W having a large number of pixels required for display is specified as “a signal waveform W having a large amount of change” (a signal waveform W having a small number of pixels required for display is specified as “a signal waveform W having a small amount of change”). The configuration and method have been described by way of example, but the criteria for specifying “a signal waveform W with a large amount of change” and “a signal waveform W with a small amount of change” are not limited to the number of pixels required for display. Specifically, as an example, a signal waveform W having a large signal level change amount within a predetermined time is specified as “a signal waveform W having a large change amount” (the signal level change amount within a predetermined time is A configuration and method in which a small signal waveform W is specified as “a signal waveform W with a small amount of change” may be employed.

  More specifically, for example, as shown in FIG. 5, when two types of signal waveforms Wa and Wb are displayed, as an example, the sampling is performed based on the measurement data D on which the signal waveforms Wa and Wb are based. The signal level change amounts La1, La2,... And the signal level change amounts Lb1, Lb2,... Within the time t corresponding to the cycle (for example, 1 μsec: an example of “second time”) are specified. Next, the absolute value of the specified signal level change amounts La1, La2,... And the total value for the time (first time) corresponding to the unit display area A of the absolute value of the signal level change amounts Lb1, Lb2,. Each calculation is performed, and it is specified that the signal waveform W having a larger total value has a larger amount of change (the signal waveform W having a smaller total value has a smaller amount of change).

  In this case, in the example shown in the figure, the amplitude values of the signal waveforms Wa and Wb are the same, but the cycle of the signal waveform Wa is shorter than that of the signal waveform Wb. Therefore, when the period is short, the signal waveform Wa is more likely to impair the visibility of other signal waveforms W displayed on the back side of the signal waveform W. The absolute value of the signal level variation La1, La2,. Since the total value of the values increases, the signal waveform Wb having a large amount of change is specified, and the signal waveform Wb is displayed on the signal waveform Wa. On the other hand, as shown in FIG. 6, the signal waveforms Wa and Wb having the same period and different amplitude values are also expressed based on the signal level change amounts La1, La2... And the signal level change amounts Lb1, Lb2. The signal waveform W having a large amount of change and the signal waveform W having a small amount of change can be specified. In the example shown in the figure, the signal level changes more in the signal waveform Wb that has a higher possibility of impairing the visibility of other signal waveforms W displayed on the back side of the signal waveform W because the amplitude value is large. Since the total value of the absolute values of the amounts Lb1, Lb2,... Increases, the signal waveform W is specified as “a signal waveform W with a large amount of change”, and the signal waveform Wa is displayed over the signal waveform Wb. .

  Thus, within the time corresponding to the unit display area A (within the first time), within the time corresponding to the sampling period of the measurement data D (within the second time shorter than the first time). By specifying that the signal waveform W having a larger absolute value of the signal level variation amount has a larger variation amount (that is, the signal waveform W having a smaller total value has a smaller variation amount), the cycle is shorter and / or the amplitude. When the value is large, the signal waveform W that is likely to impair the visibility of the other signal waveform W displayed on the back side of the signal waveform W is identified as the “signal waveform W having a large amount of change” and the back side The signal waveform W having a long period and / or a small amplitude value is less likely to impair the visibility of other signal waveforms W displayed on the back side of the signal waveform W. Signal waveform W with little variation To be displayed on the front side is identified as, it is possible to reliably improve the visibility of the variation is small signal waveform W.

  In addition, the total number of times (in this example, “zero crossing”) the number of times the number of times falls below and exceeds the prescribed signal level (for example, “0 V” as an example) within the time corresponding to the unit display area A (first time). It is also possible to adopt a configuration and a method for specifying that the signal waveform W having a larger number of “(total number of times)” has a larger amount of change (a signal waveform W having a smaller total number has a smaller amount of change). In such a configuration and method, a signal waveform W that has a large number of times of crossing a specified signal level (eg, “0V”) due to a short cycle is identified as a “signal waveform W with a large amount of change” and a long cycle. A signal waveform W having a smaller number of times of crossing the specified signal level is specified as “a signal waveform W having a small amount of change”. Therefore, by adopting such a configuration and method, the signal waveform W having a high possibility of impairing the visibility of other signal waveforms W displayed on the back side of the signal waveform W due to the short period is “ The signal waveform W having a large amount of change is identified and displayed on the back side, and a long period may impair the visibility of other signal waveforms W displayed on the back side of the signal waveform W. Since the low signal waveform W is identified as “a signal waveform W with a small amount of change” and displayed on the front side, the visibility of the signal waveform W with a small amount of change can be reliably improved.

  Furthermore, the configuration and method for displaying each signal waveform W so that the “signal waveform W with the smallest amount of change” is displayed on the foremost side have been described, but the “signal waveform W with the largest amount of change” has been described. As long as the signal waveforms W are overlapped so as to be displayed on the most back side, the order of overlapping the signal waveforms W other than the “signal waveform W having the largest amount of change” is not limited to the above example. By adopting such a configuration and method, even when the “signal waveform W with the smallest amount of change” is not displayed on the front side, the “signal waveform W with the largest amount of change” is displayed on the back side. For this reason, it is possible to reliably and easily avoid the situation in which the other signal waveform W is obscured by the “signal waveform W having the largest amount of change”, so that the visibility of the other signal waveform W can be sufficiently improved. Can do. Further, in the configuration and method in which the “signal waveform W with the largest amount of change” is displayed on the back side and the “signal waveform W with the smallest amount of change” is displayed on the front side, the “change amount is Regarding the order in which the signal waveforms W other than the “most signal waveform W” and the “signal waveform W with the smallest amount of change” are overlapped, the “signal waveform W with the largest amount of change” is closer to the rear side ( It is not limited to the order in which it is displayed on the front side.

  In addition, the example in which the “first time” is defined so that the plurality of unit display areas A1 to A10 are arranged in the time axis direction in the waveform display area 11 has been described, but the time corresponding to the entire area of the waveform display area 11 Can be defined as “first time”, and a configuration and a method for specifying “a signal waveform W having a large amount of change” and “a signal waveform W having a small amount of change” can be employed. By adopting such a configuration and method, it becomes easy to specify the amount of change, so even in a control unit with low processing capability, the order in which the signal waveforms W are superimposed can be specified and displayed in a short time. Can do.

DESCRIPTION OF SYMBOLS 1 Waveform display apparatus 4 Display part 5 Control part 6 Memory | storage part 10 Signal waveform display screen 11 Waveform display area 50 Waveform display process A1-A10 Unit display area D1, D2 Measurement data La1, La2, ..., Lb1, Lb2, ... Signal level Change t Time S2 Display signal W1, W2, Wa, Wb Signal waveform

Claims (16)

A waveform display device including a control unit that displays a plurality of signal waveforms in a waveform display region,
Wherein, the first time period corresponding to one in which the whole area of the waveform display area, and is either predefined in the unit display region defined by side more along the time axis direction in the waveform display area The number of pixels required for display of each of the signal waveforms is specified, and the signal waveform having a larger number of specified pixels has a larger amount of change in the display range corresponding to the first time in the waveform display region. as the waveform, a waveform display device for displaying by overlapping the signal waveforms within the display range such that the variation in within the display range are most often the signal waveform displayed on the rearmost side. A waveform display device including a control unit that displays a plurality of signal waveforms in a waveform display region,
Wherein, from a first time corresponding to one of the whole area of the waveform display area, and is either predefined in the unit display region defined by side more along the time axis direction in the waveform display area Each of the absolute values of the signal level change amounts of the respective signal waveforms in a short time and within a second time that is continuous within the first time, and the specified total value is large As the signal waveform has a larger amount of change in the display range corresponding to the first time in the waveform display region, the signal waveform having the largest amount of change in the display range is displayed on the back side. In this way, the waveform display device displays the signal waveforms in a superimposed manner within the display range. A waveform display device including a control unit that displays a plurality of signal waveforms in a waveform display region,
The control unit includes a first time period corresponding to a predetermined one of the entire waveform display area and a plurality of unit display areas defined side by side along the time axis direction in the waveform display area . wherein with each signal waveform is a particular predefined below a specified signal level was count and the prescribed total number of times that exceeds the signal level, respectively, the waveform display area as specified the total number often the signal waveform in As a signal waveform having a large amount of change in the display range corresponding to the first time in the display range, the signal waveform having the largest amount of change in the display range is displayed on the back side. A waveform display device for displaying the signal waveforms in a superimposed manner. A waveform display device including a control unit that displays a plurality of signal waveforms in a waveform display region,
The control unit includes a first time period corresponding to a predetermined one of the entire waveform display area and a plurality of unit display areas defined side by side along the time axis direction in the waveform display area . In addition, the period and / or signal level change amount of each of the signal waveforms is specified, and the display range corresponding to the first time in the waveform display region is increased as the specified period is shorter and / or the signal level change amount is larger. As a signal waveform with a large amount of change in the waveform, a waveform display that displays each signal waveform in a superimposed manner in the display range so that the signal waveform with the largest amount of change in the display range is displayed on the back side. apparatus. The waveform according to any one of claims 1 to 4, wherein the control unit displays the signal waveforms so as to overlap each other in the display range so that the signal waveform with the smallest amount of change is displayed on the most front side. Display device. The waveform display apparatus according to claim 5 , wherein the control unit displays the signal waveforms in an overlapping manner in the display range in order from the signal waveform having the large amount of change. When the control unit displays each signal waveform in an overlapping manner with the time corresponding to the unit display area as the first time , a plurality of unit display areas respectively corresponding to the plurality of unit display areas in the waveform display area are displayed . waveform display device according to any one of 6 claims 1 in which the by first identifying the amount of change in time to define the order in which overlapping the signal waveforms in the respective unit display each area. The control unit, when there are a plurality of the signal waveforms having the same amount of change in the first time, in the unit display area corresponding to the first time, The waveform display according to claim 7, wherein the signal waveforms having the same amount of change are superimposed and displayed in the same order as the order in which the signal waveforms are superimposed in the unit display area corresponding to the other first time immediately before. apparatus. A waveform display method for displaying a plurality of signal waveforms superimposed on a waveform display area,
Each of the signal waveforms for the first time corresponding to one of the whole waveform display area and one of the unit display areas defined side by side along the time axis direction in the waveform display area. The number of pixels required for display is specified, and as the signal waveform having a larger number of specified pixels , the signal waveform having a larger amount of change in the display range corresponding to the first time in the waveform display region is displayed. A waveform display method for displaying each signal waveform in an overlapped manner in the display range so that the signal waveform having the largest amount of change in the range is displayed on the rearmost side. A waveform display method for displaying a plurality of signal waveforms superimposed on a waveform display area,
In a shorter time than the first time corresponding to one of the waveform display areas, and one of the unit display areas defined side by side along the time axis direction in the waveform display area . And while specifying the total value of the absolute value of the signal level change amount of each signal waveform in the second time that is continuous in the first time, the signal waveform having the specified total value is larger in the waveform The display range so that the signal waveform having the largest amount of change in the display range is displayed on the back side as the signal waveform having the largest amount of change in the display range corresponding to the first time in the display area. A waveform display method for displaying each signal waveform in a superimposed manner. A waveform display method for displaying a plurality of signal waveforms superimposed on a waveform display area,
Each signal waveform in a first time corresponding to one of the entire waveform display area and a unit display area defined in a plurality along the time axis direction in the waveform display area. Respectively , and the total number of times that the specified signal level has been exceeded and the number of times that the specified signal level has been exceeded are specified, respectively, and the higher the specified total number of the signal waveforms, the more the first in the waveform display region. As each signal waveform having a large amount of change in the display range corresponding to time, each signal waveform in the display range is displayed so that the signal waveform having the largest amount of change in the display range is displayed on the back side. Waveform display method that displays multiple images. A waveform display method for displaying a plurality of signal waveforms superimposed on a waveform display area,
The signal waveforms in the first time corresponding to one of the whole waveform display area and one of the unit display areas defined side by side along the time axis direction in the waveform display area. Period and / or signal level change amount , respectively , and the shorter the specified period and / or the greater the signal level change amount, the more the change amount in the display range corresponding to the first time in the waveform display region. A waveform display method for displaying each signal waveform in an overlapped manner in the display range so that the signal waveform having the largest amount of change in the display range is displayed on the back side as a large number of signal waveforms . Waveform display method according to any one of claims 9 to 12 for displaying overlapping the signal waveforms in said display range so that the change amount is the smallest the signal waveform displayed on the most front side. The waveform display method according to claim 13 , wherein the signal waveforms are displayed in an overlapping manner in the display range in order from the signal waveform having the largest amount of change. When displaying overlapping the respective signal waveforms of time corresponding to the unit display region as the first time, a plurality of said first time corresponding to the plurality of the unit display region of the waveform display area The waveform display method according to claim 9, wherein the change amount is specified and the order in which the signal waveforms are overlapped is defined for each unit display area . When there are a plurality of the signal waveforms having the same amount of change in the first time, the other immediately before the first time in the unit display area corresponding to the first time. The waveform display method according to claim 15, wherein the signal waveforms having the same amount of change are overlapped and displayed in the same order as the order in which the signal waveforms are overlapped in the unit display area corresponding to the first time.

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