JP2011145239A - Waveform display device and waveform display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display easily in a short time, an optional signal waveform by a waveform expansion/contraction operation. <P>SOLUTION: In a waveform expansion/contraction processing 50 for displaying a signal waveform on a waveform display domain, and expanding or contracting the signal waveform centered at a specified base point in the waveform display domain along a time base direction corresponding to an operation content, when the waveform expansion/contraction operation (operation of a contraction switch 33d or expansion switch 33U) is performed after a base point designation operation (operation of function switches 31a-31e) is performed (step 51), a position designated by the base point designation operation is specified as the base point (step 53), and the waveform expansion/contraction processing is executed corresponding to the content of the waveform expansion/contraction operation (step 55, 56), and on the contrary, when the waveform expansion/contraction operation is performed without performing the base point designation operation (step 51), a reference position specified beforehand is specified as the base point (step 52), and the waveform expansion/contraction processing is executed corresponding to the content of the waveform expansion/contraction operation (step 55, 56). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a waveform display device and a waveform display method for displaying a signal waveform in a waveform display area.

  As a waveform display device that displays a signal waveform in a waveform display region according to this type of waveform display method, a measurement data display device that displays a characteristic curve based on measurement data such as voltage and temperature is disclosed in Japanese Patent Laid-Open No. 2000-10538. Has been. In this measurement data display device, the display control unit displays a characteristic curve based on the measurement data stored in the memory in the characteristic curve display area of the display screen. In this case, in this measurement data display device, a zoom key for enlarging / reducing the characteristic curve and a scroll bar for moving (scrolling) the display position of the characteristic curve are displayed at the lower part of the characteristic curve display area, via the input unit. When these are operated, the display control unit changes the display of the characteristic curve according to the operation content. Specifically, when the zoom key is operated, the characteristic curve displayed in the characteristic curve display area is enlarged or reduced. Further, when the scroll bar is operated (when a slide operation is performed), the characteristic curve displayed in the characteristic curve display area is scrolled in the operation direction of the scroll bar. Thereby, the characteristic curve is displayed in the characteristic curve display area in a desired display mode.

JP 2000-10538 A (page 3-4, FIG. 2-5)

  However, the conventional measurement data display device has the following problems. That is, the conventional measurement data display apparatus employs a configuration in which the characteristic curve (signal waveform) is enlarged or reduced by operating the zoom key and the characteristic curve (signal waveform) is scrolled by operating the scroll bar. In this case, in this type of display device, the central portion of the waveform display area (characteristic curve display area) in the time axis direction is the base point when performing waveform enlargement / reduction processing for enlarging or reducing the signal waveform (characteristic curve) along the time axis direction. In general, the signal waveform is enlarged or reduced around the base point. Specifically, in the conventional measurement data display device, as shown in FIG. 7, in the state where the signal waveform W is displayed in the waveform display region 11, for example, the vicinity of the position P1 in the signal waveform W is observed in detail. When doing so, the zoom key for instructing execution of the enlargement process is operated. At this time, the waveform enlargement / reduction processing is executed around the position P0 which is the central portion of the waveform display region 11 in the time axis direction (left and right direction in the figure), and as shown in FIG. It is enlarged and displayed along the direction.

  In this case, in the conventional measurement data display device in which the configuration in which the signal waveform W is enlarged around the position P0 (central portion) is adopted, the central portion (the signal waveform W in the time axis direction) of the signal waveform W before enlargement. The vicinity of the base point as the center of enlargement) is enlarged and displayed in the waveform display area 11 even after enlargement at a desired enlargement ratio. However, both end portions in the time axis direction of the signal waveform W before enlargement (parts far apart from the base point) are not displayed in the waveform display area 11 as the signal waveform W is enlarged, and are not displayed. . For this reason, although the signal waveform W is enlarged to observe the position P1 (see FIG. 7) in the signal waveform W before enlargement, this position P1 is a position closer to the left end in the signal waveform W before enlargement. As a result, as shown in FIG. 8, the signal waveform W in the vicinity of the position P1 is not displayed. In this case, in order to display the signal waveform W near the non-displayed position P1 in the waveform display area 11, it is necessary to scroll the signal waveform W along the time axis direction by operating the scroll bar. For this reason, the conventional measurement data display device has a problem that a series of operations for enlarging and displaying an arbitrary position in the signal waveform W is complicated.

  For a user unfamiliar with the operation of this type of apparatus, the position P1 that is not displayed as the signal waveform W is enlarged is left of the signal waveform W displayed in the waveform display area 11 after the enlargement. It is difficult to specify which direction is present on the right side or the right side. For this reason, in the conventional measurement data display device, in order to display the signal waveform W in the vicinity of the position P <b> 1 that is not displayed due to enlargement in the waveform display region 11, the scroll bar may be operated in any direction. It may be difficult to specify whether or not.

  On the other hand, as shown in FIG. 7, the signal waveform W is displayed in the waveform display area 11 (for example, the signal waveform W just before the end of the measurement of the signal waveform W based on the measurement data for a predetermined time is positioned. In the state of displaying from P2 to position P3), the signal waveform W already displayed and the signal waveform W corresponding to the measurement data measured before the measurement time corresponding to the position P2 in the signal waveform W are obtained. When observing at the same time, the zoom key for instructing execution of the reduction process is operated. At this time, the waveform enlargement / reduction processing is executed around the position P0, which is the central portion of the waveform display region 11 in the time axis direction (left-right direction in the figure), and as shown in FIG. It is displayed reduced along the direction.

  In this case, in the conventional measurement data display device in which the configuration in which the signal waveform W is reduced around the position P0 (central portion) is adopted, the signal waveform W is displayed in the waveform display area 11 before the reduction as the signal waveform W is reduced. The signal waveform W corresponding to the measurement data measured before the signal waveform W, and the signal waveform corresponding to the measurement data measured after the signal waveform W displayed in the waveform display area 11 before the reduction. Both Ws are displayed in the waveform display area 11 to the same extent. However, in this example, since there is no measurement data after the measurement time corresponding to the position P3 in the signal waveform W displayed in the waveform display area 11 before the reduction, the right half in the waveform display area 11 after the reduction. In this case, the signal waveform W is not displayed. Therefore, in order to display the signal waveform W for a sufficiently long time in the waveform display area 11 in order to effectively use the valuable display area, the signal waveform W is moved along the time axis direction by operating the scroll bar. You need to scroll (to the right in this example). Therefore, the conventional measurement data display device has a problem that a series of operations for reducing and displaying the signal waveform W for an arbitrary time 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 capable of easily displaying an arbitrary signal waveform in a short time by a waveform enlargement / reduction operation. .

  In order to achieve the above object, the waveform display device according to claim 1 displays a signal waveform in the waveform display area, and the signal waveform is centered on a base point defined in the waveform display area according to an operation signal. A waveform display device including a control unit that executes a waveform enlargement / reduction process that expands or reduces along a direction, and the control unit performs a base point specifying operation and outputs the operation signal corresponding to the base point specifying operation When the operation signal corresponding to the waveform enlargement / reduction operation is output after the waveform enlargement / reduction operation is performed, the position designated by the base point designation operation is defined as the base point and the contents of the waveform enlargement / reduction operation are defined. In response, the waveform enlargement / reduction process is executed, and when the operation signal corresponding to the waveform enlargement / reduction operation is output without outputting the operation signal corresponding to the reference point specifying operation, It defines a defined reference position as the base point to perform the waveform scaling processing according to the contents of the waveform scaling operation.

  The waveform display device according to claim 2 is the waveform display device according to claim 1, wherein the control unit corresponds to the waveform enlargement / reduction operation after the operation signal corresponding to the base point specifying operation is output. When the operation signal is output, the waveform enlargement / reduction process is executed using the position specified by the base point specifying operation as the base point, and the signal waveform at the specified position is positioned at the reference position. The signal waveform is scrolled along the time axis direction.

  The waveform display method according to claim 3 displays a signal waveform in the waveform display area, and the signal waveform is centered on a base point defined in the waveform display area along the time axis direction according to the operation content. A waveform display method for executing waveform enlargement / reduction processing for enlarging or reducing, and when a waveform enlargement / reduction operation is performed after a base point specifying operation is performed, a position specified by the base point specifying operation is defined as the base point. The waveform enlargement / reduction process is executed according to the contents of the waveform enlargement / reduction operation, and when the waveform enlargement / reduction operation is performed without performing the base point specifying operation, a predetermined reference position is defined as the base point. The waveform enlargement / reduction process is executed according to the contents of the waveform enlargement / reduction operation.

  Furthermore, the waveform display method according to claim 4 is designated by the base point designation operation when the waveform enlargement / reduction operation is performed after the base point designation operation is performed in the waveform display method according to claim 3. The waveform enlargement / reduction process is executed using the position as the base point, and the signal waveform is scrolled along the time axis direction so that the signal waveform at the designated position is located at the reference position.

  The waveform display device according to claim 1 and the waveform display method according to claim 3, wherein when the waveform enlargement / reduction operation is performed after the base point specifying operation is performed, the position specified by the base point specifying operation is defined as the base point. Then, the waveform enlargement / reduction process is performed to enlarge or reduce the signal waveform along the time axis direction according to the contents of the waveform enlargement / reduction operation with the specified base point as the center, and the waveform enlargement / reduction operation is performed without performing the base point designation operation. In this case, a predefined reference position is defined as a base point, and waveform expansion / contraction processing is executed according to the contents of the waveform expansion / contraction operation with the specified base point as the center.

  Therefore, according to the waveform display device according to claim 1 and the waveform display method according to claim 3, in order to observe in detail an arbitrary part of the signal waveform displayed in the waveform display area, By simply specifying a position in the vicinity of the desired part in the signal waveform as the position to be defined as the base point when enlarging the display, the desired part in the signal waveform is not hidden after the signal waveform is enlarged. Since the waveform display area is enlarged and displayed, observation of the desired part can be easily started in a short time without performing a scroll operation for displaying the desired part after the waveform enlargement / reduction operation. . Also, it is specified as a base point when a signal waveform is reduced and displayed in the waveform display area in the state where the signal waveform based on data measured immediately before the start of measurement or immediately before the end of the signal waveform for a predetermined time is displayed. Just specify the position near one of the two ends in the time axis direction in the signal waveform as the position to be processed, and after the signal waveform is reduced, the first half part and the second half in the time axis direction in the waveform display area Since the signal waveform for a sufficiently long time can be displayed in the waveform display area without incurring a state in which the signal waveform is hardly displayed on the part, a valuable display area can be displayed without scrolling after the waveform enlargement / reduction operation. The signal waveform can be displayed by effectively utilizing. Therefore, according to the waveform display device and the waveform display method, it is possible to easily display an arbitrary signal waveform in a short time by the waveform enlargement / reduction operation.

  According to the waveform display device according to claim 2 and the waveform display method according to claim 4, when the waveform enlargement / reduction operation is performed after the base point specifying operation is performed, the position specified by the base point specifying operation is used as the base point. As a result of executing the waveform enlargement / reduction processing, the signal waveform is scrolled along the time axis direction so that the signal waveform at the specified position is located at the reference position. When the waveform enlargement / reduction amount is different from the desired amount, execute the waveform enlargement / reduction operation to execute the waveform enlargement / reduction operation without executing the base point specification operation to specify the position specified as the base point again. The signal waveform can be enlarged or reduced so that

2 is a block diagram showing a configuration of a waveform display device 1. FIG. 2 is a front view of the waveform display device 1 in a state where a signal waveform W is displayed in a waveform display area 11 of a signal waveform display screen 10. FIG. 5 is a flowchart of a waveform enlargement / reduction process 50. FIG. 3 is a front view of the waveform display device 1 in a state where the signal waveform W shown in FIG. 2 is enlarged with a position Pb as a base point. FIG. 3 is a front view of the waveform display device 1 in a state in which the signal waveform W shown in FIG. 2 is reduced with a position Pe as a base point. The waveform display apparatus 1 in a state where the signal waveform W shown in FIG. 2 is enlarged by defining the position Pb as a base point and the signal waveform W is scrolled so that the signal waveform W near the base point is located at the position Pc. It is a front view. It is a display screen figure of the state which displayed the signal waveform W (characteristic curve) in the waveform display area (characteristic curve display area) in the conventional measurement data display apparatus. It is a display screen figure of the state which expanded the signal waveform W shown in FIG. 7 on the basis of the position P0. It is a display screen figure of the state which reduced the signal waveform W shown in FIG. 7 on the basis of the position P0.

  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, and a signal waveform W (see FIG. 2) is displayed on the display unit 4 according to a waveform display method described later. Is configured to be displayable. Under the control of the control unit 5, the measurement unit 2 measures an electrical parameter (for example, a voltage value) for the input signal Si to generate measurement data D (waveform data), and the generated measurement data D is transmitted to the control unit. 5 is output. 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. The operation unit 3 includes various operation switches (not shown) such as an operation switch for setting the operation condition of the waveform display device 1 and a start switch and a stop switch for starting / ending recording of the measurement data D. 2, function switches 31a to 31e, scroll switches 32L and 32R, a reduction switch 33D, and an enlargement switch 33U are provided, and an operation signal S1 corresponding to these operations is output to the control unit 5.

  In this case, the function switches 31a to 31e are operation switches to which various functions are assigned according to the operation state of the waveform display device 1, and in this waveform display device 1, the signal waveform display screen 10 (FIG. 2 is displayed, a function for designating a base point that is defined as a center for enlarging or reducing the signal waveform W (a function for executing a “base point designating operation”) is assigned. Specifically, the function switches 31a to 31e have a function of designating positions Pa to Pe in the time axis direction (in this example, left and right direction) in the waveform display area 11 defined in the signal waveform display screen 10 as base points. Are assigned respectively. The function switch 31a to 31e is not limited to a configuration in which a function for executing a “base point specifying operation” is assigned to an operation switch to which various functions are assigned, and a dedicated switch for executing the “base point specifying operation”. An operation switch can also be provided.

  The scroll switches 32L and 32R are operation switches for scrolling the signal waveform W. An operation signal S1 for instructing execution of “scroll processing” for scrolling the signal waveform W to the left by the operation of the scroll switch 32L. The operation signal S1 is output to instruct execution of scroll processing for scrolling the signal waveform W to the right by the operation of the scroll switch 32R. Further, the reduction switch 33D and the enlargement switch 33U are operation switches for executing a “waveform enlargement / reduction operation”, and an operation signal S1 for instructing execution of a waveform enlargement / reduction process for reducing the signal waveform W by the operation of the reduction switch 33D. And an operation signal S1 for instructing execution of waveform enlargement / reduction processing for expanding the signal waveform W by the operation of the enlargement switch 33U.

  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 is associated with a time axis in the horizontal direction, In addition, the signal waveform W is displayed in association with the signal level (in this example, the voltage value level) in the vertical direction orthogonal to the horizontal direction. 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 in accordance with the operation signal S1 from the operation unit 3 and executes measurement processing for the input signal Si (processing for generating measurement data D of the input signal Si). Let Further, the control unit 5 stores the measurement data D output from the measurement unit 2 in the storage unit 6 and generates a display signal S2 for displaying the signal waveform W based on the measurement data D to generate a display unit. 4 is output. Further, the control unit 5 operates when any of the function switches 31a to 31e is operated in a state where the signal waveform display screen 10 is displayed on the display unit 4 (when any of the positions Pa to Pe is designated). The designated position data Dp is generated so that the designated position can be specified, and stored in the storage unit 6. Further, the control unit 5 executes the waveform enlargement / reduction processing 50 shown in FIG. 3 in accordance with the operation signal S1 from the operation unit 3 (according to the operation content on the operation unit 3) and displays the waveform on the display unit 4. The signal waveform W is displayed enlarged or reduced along the time axis direction. Further, the control unit 5 executes a waveform scroll process for scrolling the signal waveform W along the time axis direction according to the operation signal S1 from the operation unit 3 (according to the operation content on the operation unit 3). The storage unit 6 stores measurement data D, designated position data Dp, 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 digitally converts the input signal Si, samples the digital signal at a set time interval, generates measurement data D, and outputs the generated measurement data D to the control unit 5. In response to this, the control unit 5 sequentially stores the measurement data D output from the measurement unit 2 in the storage unit 6. The control unit 5 executes a waveform display process for displaying the signal waveform W based on the measurement data D on the display unit 4 in parallel with the storage process of the measurement data D.

  Specifically, the control unit 5 generates a display signal S <b> 2 for displaying the signal waveform W based on the measurement data D in the waveform display region 11 on the signal waveform display screen 10 and outputs the display signal S <b> 2 to the display unit 4. As a result, the signal waveform W representing the measurement data D output from the measurement unit 2 (the voltage value for the input signal Si measured by the measurement unit 2) is displayed on the display unit 4 in almost real time. In this case, in the waveform display process executed in parallel with the measurement process, the signal waveform W in the waveform display area 11 is always scrolled to the left. Thereafter, the control unit 5 continues the storage process of the measurement data D and the display process of the signal waveform W until the stop switch of the operation unit 3 is operated and the corresponding operation signal S1 is output. Execute.

  On the other hand, in the waveform display device 1, the signal waveform W at an arbitrary time point is displayed at an arbitrary display magnification on the basis of the measurement data D in the storage unit 6 in a state where a series of measurement processes by the measurement unit 2 is completed. Waveform display processing to be displayed in the area 11 can be executed. Specifically, as shown in FIG. 2, the measurement data D measured immediately before the stop switch of the signal waveform W based on the measurement data D for a predetermined time is operated (immediately before the end of the measurement process). When the signal waveform W based on the signal waveform W is displayed from the position P2 (left end) to the position P3 (near the right end) in the waveform display area 11, for example, when the vicinity of the position P1 in the signal waveform W is observed in detail, Enlarge the waveform W.

  In this case, since the position P1 is a position closer to the end in the time axis direction in the waveform display region 11 (a position away from the center), the time of the waveform display region 11 is different from that of the conventional measurement data display device. When the signal waveform W is enlarged with the central portion (position Pc) in the axial direction as a base point, there is a possibility that the vicinity of the position P1 in the signal waveform W shown in FIG. Therefore, prior to an operation for enlarging the signal waveform W (waveform enlarging / reducing operation), a “base designating operation” for designating the vicinity of the position P1 as a base point to be the center (enlargement center) for enlarging the signal waveform W is executed. Specifically, among the function switches 31a to 31e to which the function for designating the positions Pa to Pe in the time axis direction (left and right direction in this example) of the waveform display area 11 is assigned, the position P1 is the most. The function switch 31b to which the function for designating the near position Pb is assigned is operated. At this time, the control unit 5 determines that the position Pb is specified based on the operation signal S1 from the operation unit 3 (an example of “operation signal corresponding to the base point specifying operation”), and based on the determination result. The designated position data Dp is generated and stored in the storage unit 6.

  Next, the enlargement switch 33U for instructing execution of the process of enlarging the signal waveform W (waveform enlargement / reduction process) is operated (an example in which the “waveform enlargement / reduction operation” is performed after the “base point specifying operation”). At this time, the control unit 5 starts the waveform enlargement / reduction processing 50 shown in FIG. 3 according to the operation signal S1 from the operation unit 3 (an example of “operation signal corresponding to the waveform enlargement / reduction operation”). In this waveform enlargement / reduction process 50, for example, the control unit 5 determines whether the function switches 31a to 31e are operated prior to the start of the waveform enlargement / reduction process 50 based on whether or not the designated position data Dp is stored in the storage unit 6. It is determined whether or not a position to be defined as a base point is designated by the operation (step 51).

  At this time, although different from the present example, when the base point designation operation is not performed prior to the start of the waveform enlargement / reduction process 50, the designated position data Dp does not exist in the storage unit 6, and therefore the control unit 5 Determines that the position of the base point to be the center is not specified. In this case, the control unit 5 defines the position Pc (an example of “predetermined reference position”) that is the central portion in the time axis direction in the waveform display region 11 as a base point (step 52), and the base point (position Pc). ) And the signal waveform W is enlarged and displayed (not shown). In addition, about the process which expands / contracts the signal waveform W centering on the position Pc, since the expansion / contraction process of the signal waveform W by the conventional measurement data display apparatus is the same, detailed description is abbreviate | omitted.

  On the other hand, in the present example in which the position Pb is designated prior to the start of the waveform enlargement / reduction process 50, the designated position data Dp is stored in the storage unit 6, so that the control unit 5 designates the position to be defined as the base point. It is determined that it has been done. Next, the control unit 5 defines the designated position Pb as a base point based on the designated position data Dp (step 53), and deletes the designated position data Dp from the storage unit 6. Subsequently, the control unit 5 determines which one of the reduction switch 33D and the enlargement switch 33U has been operated (step 54). At this time, since the waveform enlargement / reduction process 50 is started in accordance with the operation of the enlargement switch 33U, the control unit 5 enlarges the signal waveform W along the time axis direction around the position Pb defined as the base point. (Step 55), the waveform enlargement / reduction processing 50 is terminated.

  As a result, as shown in FIG. 4, the signal waveform W is enlarged and displayed in the time axis direction while the vicinity of the position P1 in the signal waveform W is displayed at the position Pb. Accordingly, it is possible to immediately observe the signal waveform W in the vicinity of the position P1 without operating the scroll switch 32L and scrolling the signal waveform W after the signal waveform W is enlarged by operating the enlargement switch 33U. In the waveform display device 1, the measurement data D of the signal waveform W displayed in the waveform display area 11 before the operation of the scroll switch 32L is obtained by operating the scroll switch 32L to scroll the signal waveform W leftward. The signal waveform W based on the measurement data D measured later can be referred to. Further, in the waveform display device 1, the measurement data D of the signal waveform W displayed in the waveform display area 11 before the operation of the scroll switch 32R is obtained by operating the scroll switch 32R to scroll the signal waveform W to the right. The signal waveform W based on the measurement data D measured before can be referred to.

  Further, as shown in FIG. 2, in the state where the signal waveform W is displayed from the position P2 (left end portion) to the position P3 in the waveform display area 11, the signal waveform W already displayed and the position P2 in the signal waveform W are displayed. When the signal waveform W corresponding to the measurement data D measured before the corresponding measurement time is simultaneously observed, the signal waveform W is reduced. In this case, in this example, since there is no measurement data D measured after the measurement time corresponding to the position P3, the central portion (in the time axis direction) of the waveform display region 11 (as in the conventional measurement data display device) When the signal waveform W is reduced with the position Pc) as the base point, the signal waveform W is not displayed in the right half of the waveform display region 11. Therefore, prior to an operation for reducing the signal waveform W (waveform enlargement / reduction operation), a position closer to the end in the time axis direction of the signal waveform W (this center) In the example, a “base point specifying operation” for specifying a position in the vicinity of the position P3) is executed.

  Specifically, among the function switches 31a to 31e to which the function for designating the positions Pa to Pe in the time axis direction of the waveform display area 11 is assigned, the function for designating the position Pe closest to the position P3 is assigned. The function switch 31e is operated. At this time, the control unit 5 determines that the position Pe is specified based on the operation signal S1 from the operation unit 3 (another example of the “operation signal corresponding to the base point specifying operation”), and the determination result. Based on this, the designated position data Dp is generated and stored in the storage unit 6.

  Next, the reduction switch 33D for instructing execution of the process of reducing the signal waveform W (waveform enlargement / reduction process) is operated (another example in which the “waveform enlargement / reduction operation” is performed after the “base point specifying operation”). At this time, the control unit 5 starts the waveform enlargement / reduction process 50 according to the operation signal S1 from the operation unit 3 (another example of the “operation signal corresponding to the waveform enlargement / reduction operation”). In this example, since the designated position data Dp is stored in the storage unit 6, the control unit 5 determines that the position to be defined as the base point is designated (step 51). Next, the control unit 5 defines the designated position Pe as a base point based on the designated position data Dp (step 53), and deletes the designated position data Dp from the storage unit 6.

  Subsequently, the control unit 5 determines that the reduction switch 33D has been operated (step 54), reduces the signal waveform W along the time axis direction around the position Pe defined as the base point (step 56), and The waveform enlargement / reduction process 50 ends. As a result, as shown in FIG. 5, the signal waveform W is reduced and displayed in the time axis direction while the vicinity of the position P3 in the signal waveform W remains displayed at the position Pe. Therefore, after the signal waveform W is reduced by operating the reduction switch 33D, the signal waveform W is displayed over almost the entire time axis direction of the waveform display region 11 without operating the scroll switch 32R to scroll the signal waveform W. It will be in the state.

  Thus, in the waveform display device 1 and the waveform display method by the waveform display device 1, the base point specifying operation (in this example, the operation of the function switches 31a to 31e in the state where the signal waveform W is displayed in the waveform display region 11). ) Is performed, and when the waveform enlargement / reduction operation (the operation of either the reduction switch 33D or the enlargement switch 33U) is performed, the base point is any one of the positions Pa to Pe designated by the base point designation operation. And the waveform enlargement / reduction processing 50 is performed to enlarge or reduce the signal waveform W along the time axis direction according to the contents of the waveform enlargement / reduction operation with the specified base point as the center. When the enlargement / reduction operation is performed, a reference position defined in advance (in this example, a position P that is a central portion in the time axis direction of the waveform display region 11) ) Was defined as a base point, and executes the waveform scaling process 50 according to the contents of the waveform scaling operations around the specified base point.

  Therefore, according to the waveform display device 1 and the waveform display method by the waveform display device 1, the signal waveform W is used to observe in detail an arbitrary portion of the signal waveform W displayed in the waveform display region 11. When the enlarged display is performed, the position near the desired part in the signal waveform W is simply designated as the position to be defined as the base point. After the signal waveform W is enlarged, the desired part in the signal waveform W is not displayed. Since it is enlarged and displayed in the waveform display area 11, observation of the desired part can be started easily in a short time without performing a scroll operation for displaying the desired part after the waveform enlargement / reduction operation. can do. Further, the signal waveform W in the state where the signal waveform W based on the measurement data D measured immediately after the start of measurement or immediately before the end of the signal waveform W based on the measurement data D for a predetermined time is displayed in the waveform display area 11. When displaying W in a reduced size, the signal waveform W can be reduced simply by designating a position near either one of both ends in the time axis direction of the signal waveform W as a position to be defined as a base point. Since the signal waveform W for a sufficiently long time can be displayed in the waveform display area 11 without incurring a state where the signal waveform W is hardly displayed in the first half part and the second half part in the time axis direction in the waveform display area 11 later. The signal waveform W can be displayed by effectively utilizing the valuable display area without performing the scroll operation after the waveform enlargement / reduction operation. Therefore, according to the waveform display device 1 and the waveform display method by the waveform display device 1, an arbitrary signal waveform W can be easily displayed in a short time by the waveform enlargement / reduction operation.

  When the waveform enlargement / reduction operation is executed after the base point specifying operation for specifying the position to be defined as the base point from the positions Pa to Pe, the waveform expansion / reduction processing is performed on the signal waveform W in the vicinity of the position specified by the base point specifying operation. Although the waveform display device 1 and the waveform display method configured to be displayed at the same position later have been described, when the waveform enlargement / reduction operation is performed after the base point designation operation is performed, as illustrated in FIG. The waveform enlargement / reduction processing 50 is executed with the position specified by the base point specifying operation (for example, the position Pb) as the base point, and as shown in FIG. 6, the signal waveform W at the specified position is a reference position (in this example, A configuration and a method of scrolling the signal waveform W along the time axis direction so as to be positioned at the position Pc) can also be adopted. In this case, either the process of enlarging or reducing the signal waveform W and the process of scrolling the signal waveform W so that the position designated by the base point designation operation is positioned at the reference position may be executed first. In addition, both processes may be executed simultaneously.

  By adopting such a configuration and method, when the waveform enlargement / reduction operation is performed after the base point specifying operation, the signal waveform W at the position specified by the base point specifying operation is positioned at the reference position (position Pc). Therefore, when the signal waveform W is enlarged by the waveform enlargement / reduction operation and is displayed in a smaller size than the desired display magnification, the signal waveform W is enlarged too much by the waveform enlargement / reduction operation and displayed larger than the desired display magnification. When the signal waveform W is reduced by the waveform enlargement / reduction operation and is displayed larger than the desired display magnification, and when the signal waveform W is reduced too much by the waveform enlargement / reduction operation, it is displayed smaller than the desired display magnification. Then, only by operating the reduction switch 33D or the enlargement switch 33U, the waveform enlargement / reduction process 50 based on the reference position is executed. Therefore, by adopting such a configuration and method, the position defined as the base point when the amount of enlargement or reduction of the signal waveform W by the waveform enlargement / reduction operation performed after the base point designation operation is different from the desired amount. The signal waveform W can be enlarged or reduced so that the desired enlargement amount or reduction amount can be obtained by executing the waveform enlargement / reduction operation without executing the base point specifying operation for specifying again.

  Further, when the base point designation operation is not performed prior to the waveform enlargement / reduction operation, the signal waveform W is enlarged or defined by defining the central portion (in this example, the position Pc) in the time axis direction of the waveform display region 11 as the base point. Although the configuration and the method for reducing the size have been described, the “predetermined reference position” is not limited to the central portion in the time axis direction, and either one of the end portions in the time axis direction or the time axis direction. An arbitrary position such as an arbitrary position between both ends (for example, any one of positions Pa, Pb, Pd, and Pe) can be defined as the reference position.

  Further, a position defined as a base point for enlarging or reducing the signal waveform W is designated by operating the reduction switch 33D and the enlargement switch 33U, and the signal waveform W is enlarged or reduced by the operation of the reduction switch 33D or the enlargement switch 33U. Although the waveform display device 1 configured to execute the waveform enlargement / reduction processing 50 has been described as an example, the configuration of the operation switch for the base point designation operation and the waveform enlargement / reduction operation is not limited thereto. For example, a touch panel (for example, a pressure-sensitive touch panel or an electrostatic touch panel) is provided on the front side of the display unit 4, a touch operation (tap operation) on the touch panel is set as a base point specifying operation, and a drag operation on the touch panel is a waveform. A configuration in which the above waveform enlargement / reduction processing 50 is executed as the enlargement / reduction operation may be employed. Further, instead of the touch panel, it is possible to adopt a configuration in which the above-described base point designation operation and waveform enlargement / reduction operation are executed by various pointing devices capable of a drag operation such as a mouse or a trackball.

  In addition, the waveform display device 1 integrally including the measurement unit 2 has been described as an example. However, the configuration of the waveform display device is not limited to this, and the measurement data D generated by the measurement device as an external device is included in the measurement data D. A configuration (not shown) for displaying the signal waveform W based thereon can also be adopted. Furthermore, although the waveform display device 1 integrally provided with the display unit 4 has been described as an example, the configuration of the waveform display device is not limited to this, and the configuration in which the signal waveform W is displayed on the display device as an external device. (Not shown) can also be adopted.

DESCRIPTION OF SYMBOLS 1 Waveform display apparatus 3 Operation part 4 Display part 5 Control part 6 Storage part 10 Signal waveform display screen 11 Waveform display area 31a-31e Function switch 32L, 32R Scroll switch 33D Reduction switch 33U Expansion switch 50 Waveform expansion / contraction process D Measurement data Dp designation | designated Position data P1 to P3, Pa to Pe Position S1 Operation signal S2 Display signal W Signal waveform

Claims (4)

A control unit that displays a signal waveform in the waveform display area and executes a waveform enlargement / reduction process that enlarges or reduces the signal waveform in the time axis direction according to an operation signal with a base point defined in the waveform display area as a center. A waveform display device comprising:
The control unit performs a waveform enlargement / reduction operation after a base point designation operation is performed and the operation signal corresponding to the base point designation operation is output, and the operation signal corresponding to the waveform enlargement / reduction operation is output. The position designated by the base point designation operation is defined as the base point, the waveform enlargement / reduction process is executed according to the contents of the waveform enlargement / reduction operation, and the operation signal corresponding to the base point designation operation is not output. A waveform display device that, when the operation signal corresponding to the waveform enlargement / reduction operation is output, defines a predetermined reference position as the base point and executes the waveform enlargement / reduction processing according to the contents of the waveform enlargement / reduction operation.   When the operation signal corresponding to the waveform enlargement / reduction operation is output after the operation signal corresponding to the base point specifying operation is output, the control unit uses the position specified by the base point specifying operation as the base point. The waveform display apparatus according to claim 1, wherein the waveform display apparatus performs the waveform enlargement / reduction processing and scrolls the signal waveform along the time axis direction so that the signal waveform at the designated position is positioned at the reference position. Waveform display that displays a signal waveform in the waveform display area and executes a waveform enlargement / reduction process that expands or reduces the signal waveform along the time axis according to the operation content with the base point defined in the waveform display area as the center A method,
When the waveform enlargement / reduction operation is performed after the base point designation operation is performed, the position designated by the base point designation operation is defined as the base point, and the waveform enlargement / reduction process is executed according to the contents of the waveform enlargement / reduction operation. When the waveform enlargement / reduction operation is performed without performing the base point designation operation, a predetermined reference position is defined as the base point, and the waveform enlargement / reduction process is executed according to the contents of the waveform enlargement / reduction operation. Waveform display method.   When the waveform enlargement / reduction operation is performed after the base point designation operation is performed, the waveform enlargement / reduction process is executed using the position designated by the base point designation operation as the base point, and the signal at the designated position is performed. The waveform display method according to claim 3, wherein the signal waveform is scrolled along the time axis direction so that the waveform is located at the reference position.

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