JP2010002404A - Waveform display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waveform measurement device that allows a user to instantaneously and intuitively grasp information about a cursor and thereby enhances user friendliness. <P>SOLUTION: A waveform measurement device 1 includes: an A-D conversion section 11 that converts, a signal to be measured that is input thereto via an input terminal T1 into digital signal waveform data; a waveform data memory 12 that stores the obtained waveform data; and a control section 13 that controls a display 20 so that the display can display the waveform data stored in the waveform data memory 12. The control section 13 includes a cursor display 23 that displays, together with the waveform data displayed by the display section 20, an arrow cursor one end of which functions as a first cursor and the other end of which functions as a second cursor and related information related to the arrow cursor, the related information displayed in association with the arrow cursor. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a waveform display device that displays a voltage waveform, a current waveform, and other various waveforms.

  Various waveform measuring devices such as oscilloscopes and spectrum analyzers are equipped with display devices such as CRT (Cathode Ray Tube) and liquid crystal display devices, and various waveforms such as measured voltage waveforms, current waveforms, and spectrum waveforms are displayed on the display device. It is common to be done. In recent years, waveform measuring apparatuses capable of outputting measurement results (waveform data) externally have been put into practical use. In such a waveform measuring apparatus, waveform data obtained by measurement can be analyzed on a computer by taking the waveform data into a computer such as a personal computer and displaying it using a waveform analysis tool.

  In general, the waveform analysis tools used in the various waveform measuring apparatuses and computers described above display a cursor that can be moved by a user operation on the waveform, and also display a physical quantity (for example, voltage or voltage) corresponding to the display position of the cursor. A cursor display function for displaying time) is provided. By using this cursor display function, grasping of the waveform state and quantitative objective evaluation can be facilitated, and the convenience of waveform analysis can be improved. Examples of the cursor displayed by the cursor display function include a linear cursor extending in the vertical or horizontal direction of the display screen, a marker cursor pointing to a point on the display screen, and the like. 11A and 11B are diagrams showing a display example of a conventional cursor, where FIG. 11A is a diagram showing a display example of a linear cursor, and FIG. 11B is a diagram showing a display example of a marker cursor.

  In the example shown in FIG. 11A, a voltage waveform WF100, two vertical cursors C101 and C102, two horizontal cursors C111 and C112, and cursor information IF101 and IF102 are displayed in the display screen W100. The vertical cursors C101 and C102 are translated in the horizontal direction of the display screen W100 by a user operation (for example, an operation of a predetermined key provided in the waveform measuring apparatus). As cursor information IF101 related to the vertical cursors C101 and C102, time (T1, T2) corresponding to the position of the vertical cursors C101, C102 in the horizontal direction of the display screen W100, and time interval (ΔT corresponding to the interval between the vertical cursors C101, C102) ) Etc. are displayed.

  Further, the horizontal cursors C111 and C112 are translated in the vertical direction of the display screen W100 by the user's operation. As the cursor information IF102 regarding the horizontal cursors C111 and C112, voltage values (V1 and V2) corresponding to the positions of the horizontal cursors C111 and C112 in the vertical direction of the display screen W100, and voltage differences corresponding to the intervals between the horizontal cursors C111 and C112 ( ΔV) is displayed. When the vertical cursors C101 and C102 are translated in the horizontal direction by the user's operation, the contents of the cursor information IF101 change in accordance with the position, and when the horizontal cursors C111 and C112 of the user are translated in the vertical direction, the position is changed to that position. Accordingly, the contents of the cursor information IF102 change in conjunction with each other.

  In the example shown in FIG. 11B, a voltage waveform WF200, four marker cursors C201 to C204, and cursor information IF201 and IF202 are displayed in the display screen W100. The marker cursors C201 to C204 move in the vertical direction and the horizontal direction in the display screen W100 by a user operation. As cursor information IF201 related to the marker cursors C201 to C204, times (T1 to T4) corresponding to the respective positions of the marker cursors C201 to C204 in the horizontal direction of the display screen W100 are displayed. Voltage values (V2 to V4) corresponding to the positions of the marker cursors C202 to C204 in the vertical direction, and voltage differences (V1−V2, V1−V3, V1−) corresponding to the intervals between the marker cursor C201 and the marker cursors C202 to C204. V4) is displayed. When the marker cursors C201 to C204 are moved by the user's operation, the contents of the cursor information IF201 and IF202 change in conjunction with the positions.

  In addition, recent waveform measuring apparatuses and waveform analysis tools have been improved in functionality, and many have analysis functions for performing various analyzes on waveform data. For example, the difference between the maximum peak value and the minimum peak value of the voltage waveform WF100 within the range defined by the vertical cursors C101 and C102 shown in FIG. When the voltage waveform is a logic waveform, it has a function of analyzing a voltage value or the like of the logic level (“H (high)” level and “L (low)” level). The analysis result obtained by such a function is collectively displayed in another display area provided outside the waveform data display area, for example, and used for quantitative evaluation of the voltage waveform by the user.

For details of the conventional cursor display function, see, for example, Patent Document 1 below.
JP 2001-305160 A

  By the way, the waveform analysis tool used in the waveform measuring apparatus and the computer described above can display not only one but also a plurality of waveforms at the same time, and even when a plurality of waveforms are displayed, the cursor display function displays the cursor. Is possible. However, when the linear cursors (vertical cursors C101 and C102 and horizontal cursors C111 and 112) shown in FIG. 11A are displayed by the conventional cursor display function, the cursor is displayed across a plurality of waveforms. Therefore, there is a problem that it is difficult to understand which waveform each cursor is focused on.

  As shown in FIG. 11, the conventional cursor display function displays cursor information for each displayed cursor. However, when a large number of cursors are displayed at a time, the cursor display becomes complicated. there were. Further, since the linear cursor and marker cursor shown in FIG. 11 are both cursors intended to display measured values at a certain position, the visibility is not good for measuring the time interval or voltage difference between two points. There was a problem that it was not good.

  Further, as shown in FIG. 11, in the conventional cursor display function, the cursor and the cursor information are displayed at positions separated from each other. For this reason, it is necessary to move the line of sight when checking the cursor information of a certain cursor, and it is necessary to check the correspondence between the cursor and the cursor information, so the cursor information can be grasped instantaneously and intuitively. There was a problem that could not be done. The above problems also occur when displaying the analysis result of the waveform data within the range defined by the cursor.

  The present invention has been made in view of the above circumstances, and provides a waveform measuring apparatus that allows a user to grasp information related to a cursor instantaneously and intuitively, thereby improving user convenience. With the goal.

In order to solve the above problems, the waveform display device of the present invention displays at least one waveform (WF, WF1 to WF5, WF11, WF12, WF21 to WF23), and displays related information related to the cursor and the cursor. In the waveform display device for displaying accompanying the waveform, a line segment cursor (C, C1 to C6, C11, C12) having one end functioning as a first cursor and the other end functioning as a second cursor different from the first cursor. , C30 to C50) and related information (IF, IF1 to IF6, IF11, IF12, IF30 to IF50, IF62, IF63) related to the line cursor is associated with the line cursor. A cursor display unit (23) for displaying in a state is provided.
According to the present invention, a line segment cursor having one end functioning as a first cursor and the other end functioning as a second cursor is displayed, and related information according to the length of the line segment cursor is associated with the line segment cursor. Is displayed in the displayed state.
The waveform display device of the present invention is characterized in that the cursor display unit expands and contracts the line segment cursor according to a user instruction and updates the related information according to the expansion and contraction of the line segment cursor. Yes.
Further, the waveform display device of the present invention is characterized in that the cursor display unit restricts the expansion / contraction direction of the line segment cursor to at least one of two directions intersecting each other.
In the waveform display device of the present invention, the cursor display unit displays the related information in the vicinity of the line segment cursor.
In the waveform display device of the present invention, the cursor display unit displays the related information at a position that does not overlap the waveform, and extends from the line cursor to the display position of the related information (L). Is displayed.
In addition, the waveform display device of the present invention includes an output unit (18) that outputs image data in a state where the line segment cursor and the related information are associated with the waveform to the outside.
The waveform display device of the present invention is characterized in that the related information is cursor information related to the cursor.
Further, the waveform display device of the present invention includes a waveform analysis unit (21) for analyzing the waveform, and the related information is an analysis result of the waveform analysis unit within a range defined by the line segment cursor. It is the information which shows.
Here, the waveform display device of the present invention is characterized in that the cursor display unit displays the related information, which is an analysis result of the waveform analysis unit, in a graph.
In the waveform display device of the present invention, the cursor display unit displays the line segment cursor and the related information for each waveform when a plurality of the waveforms are displayed.
Further, the waveform display device of the present invention is characterized in that the cursor display unit can display a plurality of the line segment cursors and the related information for one waveform.

  According to the present invention, a line cursor whose one end functions as a first cursor and the other end functions as a second cursor is displayed, and related information related to the line cursor is associated with the line cursor. Since the information is displayed in the state, the user can instantly and intuitively understand the related information related to the cursor, thereby improving the convenience of the user.

  Hereinafter, a waveform display device according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of a waveform measuring apparatus including a waveform display apparatus according to an embodiment of the present invention. In this embodiment, a mode in which the waveform display device is provided in an oscilloscope which is a kind of waveform measurement device will be described. As shown in FIG. 1, the waveform measuring apparatus 1 includes an input terminal portion 2, a plurality of operation keys 3, and a display 4 on the front surface thereof.

  The input terminal unit 2 includes a plurality of input terminals 2a to 2d, and probes (not shown) are connected to the input terminals 2a to 2d as necessary. That is, the waveform measuring apparatus 1 shown in FIG. 1 can simultaneously measure four types of waveforms (four channels). The operation key 3 is used to input a user instruction to the waveform measuring apparatus 1 and includes a plurality of push buttons, a rotary knob, and the like operated by the user. The display 4 is, for example, a liquid crystal display device or a CRT (Cathode Ray Tube), and displays measured waveform data as well as an arrow cursor and related information related to the arrow cursor (both will be described in detail later). The

  FIG. 2 is a block diagram showing a main configuration of a waveform measuring apparatus including a waveform display apparatus according to an embodiment of the present invention. As shown in FIG. 2, the waveform measuring apparatus 1 includes an A / D conversion unit 11, a waveform data memory 12, a control unit 13, a hard disk 14, a ROM (Read Only Memory) 15, a RAM (Random Access Memory) 16, and an operation unit 17. , An output unit 18, a display control unit 19, and a display unit 20.

  The A / D conversion unit 11 performs sampling and quantization on a signal input from the input terminal T1 (any one of the input terminals 2a to 2d provided in the input terminal unit 2 shown in FIG. 1). The signal is converted into digital signal waveform data. As described above, since the waveform measuring apparatus 1 shown in FIG. 1 can simultaneously measure four channels, the A / D converters 11 are provided in the number corresponding to the number of input terminals (four). However, only one is shown in FIG. 2 for simplicity of illustration.

  The waveform data memory 12 is a memory (acquisition memory) including a RAM or the like that stores the waveform data output from the A / D converter 11. The control unit 13 comprehensively controls the operation of the waveform measuring apparatus 1. For example, the waveform data stored in the waveform data memory 12 is controlled to be read, the read waveform data is analyzed, and the waveform data and the arrow cursor and related information are input according to a user instruction input via the operation unit 17. Control information display.

  Specifically, the control unit 13 includes a waveform analysis unit 21, a waveform display unit 22, and a cursor display unit 23. The waveform analysis unit 21 reads out the waveform data stored in the waveform data memory 12 and performs waveform analysis, and determines the peak value (maximum peak value and minimum peak value), the difference between the maximum peak value and the minimum peak value, the maximum value, Find the minimum value, frequency, etc. When the waveform data relates to a logic waveform, a voltage value or the like of the logic level (“H” level and “L” level) is obtained.

  The waveform display unit 22 reads the waveform data stored in the waveform data memory 12, processes the waveform data into display data, outputs the data to the display control unit 19, and causes the display control unit 19 to display the display data. . Here, the processing of the waveform data performed in the waveform display unit 22 is, for example, processing to display data for enlarged display in which a part of the waveform data is displayed on the display unit 20 in response to an operation on the operation unit 17 by the user. Alternatively, it is processing to display data for reduction display in which the entire waveform data is displayed on the display unit 20.

  The cursor display unit 23 performs display control of an arrow cursor (line segment cursor), related information related to the arrow cursor, and various types of information related to other cursors, and displays these cursors according to the user's operation on the operation unit 17. Control to update. Here, the arrow cursor is a cursor that is displayed in association with the waveform displayed on the display unit 20 and that has arrows at both ends indicating two different points in the vertical or horizontal direction of the display screen in the display unit 20. is there. This arrow cursor functions as a cursor (first cursor) whose one end points to one point in the vertical or horizontal direction of the display screen in the display unit 20 and functions as a cursor (second cursor) whose other end points to another point. The cursor is a line segment that expands and contracts in the moving direction in accordance with the movement of both ends by the user's operation.

  The related information refers to cursor information related to the arrow cursor or analysis result information indicating an analysis result of the waveform analysis unit 21 within a range defined by the arrow cursor. Specifically, the cursor information is information indicating a physical quantity between two points indicated by the arrow cursor, and is information displayed in a state associated with the arrow cursor by the cursor display unit 23. For example, when a voltage waveform is displayed on the display unit 20, the cursor information associated with the arrow cursor extending in the horizontal direction of the display screen in the display unit 20 is set to the length of the arrow cursor and the horizontal scale of the display screen. Cursor information associated with an arrow cursor extending in the vertical direction of the display screen in the display unit 20 indicates a voltage difference corresponding to the length of the arrow cursor and the vertical scale of the display screen. Information. This cursor information is displayed as a numerical value, for example, and the content is updated in conjunction with the expansion and contraction of the arrow cursor.

  3A and 3B are diagrams showing a display example of an arrow cursor and cursor information. FIG. 3A is a display example in which an arrow cursor and cursor information are displayed in addition to a vertical cursor and a horizontal cursor, and FIG. It is a display example which displayed cursor information. In the example shown in FIG. 3A, a waveform WF, two vertical cursors C11 and C12, two horizontal cursors C21 and C22, an arrow cursor C1, and cursor information are displayed in the display screen W1 (display 4) of the display unit 20. IF1 is displayed. The arrow cursor C1 extends in the horizontal direction of the display screen W1 and is displayed between the vertical cursors C11 and C12, and both ends thereof are set to the positions of the vertical cursors C11 and C12 (positions in the horizontal direction of the display screen W1), respectively. Has been.

  The cursor information IF1 is displayed between the vertical cursors C11 and C12 and in the vicinity of the arrow cursor C1. In the example shown in FIG. 3A, “1990.00000 us” is displayed as the cursor information IF1. The cursor information IF1 indicates that the length of the arrow cursor C1 (interval in the horizontal direction of the display screen W1 of the vertical cursors C11 and C12) corresponds to 199.0000 μsec.

  When the user operates a predetermined key of the operation keys 3, the cursor display unit 23 translates the vertical cursors C11 and C12 in the horizontal direction of the display screen W1 by a distance corresponding to the operation amount of the user. The end position of the arrow cursor C1 is changed in conjunction with the movement of the vertical cursors C11 and C12, and the arrow cursor C1 is expanded and contracted. The cursor display unit 23 updates the cursor information IF1 in accordance with the expansion and contraction of the arrow cursor C1 (changes the numerical value indicated as the cursor information IF1 according to the length of the arrow cursor C1).

  On the other hand, in the example shown in FIG. 3B, the waveform WF1, arrow cursors C11 and C12, and cursor information IF11 and IF12 are displayed in the display screen W1 (display 4) of the display unit 20. The arrow cursor C11 extends in the horizontal direction of the display screen W1, and cursor information IF11 is displayed in the vicinity thereof. The arrow cursor C12 extends in the vertical direction of the display screen W1, and cursor information IF12 is displayed in the vicinity thereof. In the example shown in FIG. 3B, “1990.00000 us” is displayed as the cursor information IF11, and “180.0 mV” is displayed as the cursor information IF12. The cursor information IF11 indicates that the length of the arrow cursor C11 corresponds to 199.0000 μsec, and the cursor information IF12 indicates that the length of the arrow cursor C12 corresponds to 180.0 mV.

  In the example shown in FIG. 3B, auxiliary lines h1 and h2 extending in the direction intersecting the length direction of the arrow cursor C11 (the horizontal direction of the display screen W1) are displayed at both ends of the arrow cursor C11. In addition, auxiliary lines h3 and h4 extending in the direction intersecting the length direction of the arrow cursor C12 (the vertical direction of the display screen W1) are displayed at both ends of the arrow cursor C12. By displaying these auxiliary lines h1 to h4, the positions of both ends of the arrow cursors C11, C12, C21, and C22 with respect to the waveform WF1 displayed on the display screen W1 can be easily and accurately grasped.

  In the example shown in FIG. 3B, when the user operates a predetermined key among the operation keys 3, the cursor display unit 23 moves the end of the arrow cursor C11 in the horizontal direction of the display screen W1. The arrow cursor C11 is expanded and contracted by translating the distance corresponding to the amount. Further, the end of the arrow cursor C12 is translated in the vertical direction of the display screen W1 by a distance corresponding to the operation amount of the user, and the arrow cursor C12 is expanded and contracted. The cursor display unit 23 updates the cursor information IF12 and IF12 in accordance with the expansion and contraction of the arrow cursors C11 and C12 (the numerical values shown as the cursor information IF11 and IF12 are set to the lengths of the arrow cursors C11 and C12). Change accordingly). Furthermore, the cursor display unit 23 also changes the positions of the auxiliary lines h1 to h4 in accordance with the change of the end positions of the arrow cursors C11 and C12.

  The analysis result information is specifically information indicating the analysis result of the waveform analysis unit 21 within the range defined by the arrow cursor, and is in a state associated with the arrow cursor by the cursor display unit 23. Information to be displayed. For example, when a voltage waveform is displayed on the display unit 20, analysis result information associated with an arrow cursor extending in the horizontal direction of the display screen in the display unit 20 is indicated by an arrow passing through each of both end portions of the arrow cursor. This is information indicating the difference, maximum value, minimum value, etc., between the maximum peak value and the minimum peak value of the voltage waveform displayed in the range sandwiched between two line segments intersecting the cursor. This analysis result information is also displayed as a numerical value, for example, like the cursor information, and its contents are updated in conjunction with the expansion and contraction of the arrow cursor.

  FIG. 4 is a diagram illustrating a display example of an arrow cursor and analysis result information. In the example shown in FIG. 4, two display areas R1 and R2 are provided in the display screen W1 (display 4) of the display unit 20, and waveforms WF11 and WF12 are displayed in these display areas R1 and R2, respectively. . The waveform WF11 displayed in the display area R1 is a sinusoidal analog signal waveform, and the waveform WF12 displayed in the display area R2 is a binary digital signal waveform.

  In the display area R1, a pair of vertical cursors C31 and C32, an arrow cursor C30, and analysis result information IF30 are displayed together with the waveform WF11. The arrow cursor C30 extends in the horizontal direction of the display screen W1 and is displayed between the vertical cursors C31 and C32. Both ends thereof are set to the positions of the vertical cursors C31 and C32 (positions in the horizontal direction of the display screen W1), respectively. Has been. The analysis result information IF30 is displayed between the vertical cursors C31 and C32 and in the vicinity of the arrow cursor C30.

  In the example shown in FIG. 4, “Max 1030 mV”, “Min −1030 mV”, and “PP 2060 mV” are displayed as the analysis result information IF30. The analysis result information IF30 has a maximum value “1030 mV” in the portion displayed in the range between the vertical cursors C31 and C32 located at both ends of the arrow cursor C30 in the waveform WF11 displayed in the display region R1. The minimum value is “−1030 mV”, and the difference between the maximum peak value and the minimum peak value is “2060 mV”.

  In the display area R2, two pairs of vertical cursors C41, C42, C51, C52, arrow cursors C40, C50, and analysis result information IF40, IF50 are displayed together with the waveform WF12. The arrow cursor C40 extends in the horizontal direction of the display screen W1 and is displayed between the vertical cursors C41 and C42, and both ends thereof are set to the positions of the vertical cursors C41 and C42 (positions in the horizontal direction of the display screen W1), respectively. Has been. The analysis result information IF40 is displayed between the vertical cursors C41 and C42 and in the vicinity of the arrow cursor 40.

  In the example illustrated in FIG. 4, “Period 3.998 ms” and “Count 3” are displayed as the analysis result information IF 40. This analysis result information IF40 includes “3” periods (in the portion displayed in the range between the vertical cursors C41 and C42 positioned at both ends of the arrow cursor C40 in the waveform WF12 displayed in the display region R2. (Rounded down) waveform is included, indicating that one period is “3.9998 ms”.

  Similarly, the arrow cursor C50 extends in the horizontal direction of the display screen W1 and is displayed between the vertical cursors C51 and C52, and both ends thereof are the positions of the vertical cursors C51 and C52 (positions in the horizontal direction of the display screen W1). ) Is set. The analysis result information IF50 is displayed between the vertical cursors C51 and C52 and in the vicinity of the arrow cursor 430. In the example illustrated in FIG. 4, “High 1030 mV”, “Low −1030 mV”, and “Count 2” are displayed as the analysis result information IF50. This analysis result information IF50 includes “2” periods (in the portion displayed between the vertical cursors 541 and C52 located at both ends of the arrow cursor C50 in the waveform WF12 displayed in the display region R2. The waveform of the waveform WF12 is “1030 mV” and the voltage value of the “L” level is “−1030 mV”.

  As described above, in the present embodiment, it is possible to display the arrow cursor and related information (analysis result information) for each waveform WF11 displayed in the display region R1 and each waveform WF12 displayed in the display region R2. In addition, a plurality of arrow cursors C40 and C50 and related information (analysis result information IF40 and IF50) can be displayed for one waveform WF12. Of course, a plurality of arrow cursors and related information can be displayed on the waveform WF11.

  Furthermore, waveforms of a plurality of channels can be displayed in the display area R1 (or display area R2), and an arrow cursor and related information can be displayed for each waveform. For example, the waveform WF11 and the waveform WF12 are displayed so as to overlap the display area R1, and the arrow cursors C30, C40, C50 are displayed in the display area R1. Associating the arrow cursor C30 with the waveform WF11 and associating the arrow cursors C40, C50 with the waveform WF12, the waveform and the color of the related information are made the same, or the channel name is added to the related information.

  When the user operates a predetermined key among the operation keys 3, the cursor display unit 23 moves the vertical cursors C31, C32, C41, C42, C51, and C52 in the horizontal direction of the display screen W1 according to the operation amount of the user. Translate the distance. Further, in association with the movement of the vertical cursors C31 and C32, the vertical cursors C41 and C42, and the vertical cursors C51 and C52, the end positions of the arrow cursors C30, C40, and C50 are respectively changed and expanded / contracted. Further, the waveform analysis unit 21 performs analysis in accordance with the expansion and contraction of the arrow cursors C30, C40, and C50, and the cursor display unit 23 updates the analysis result information IF30, IF40, and IF50 each time the waveform analysis unit 21 performs analysis. To do.

  Returning to FIG. 2, the hard disk 14 records the analysis result of the waveform analysis unit 21 of the control unit 13 and other various data. The ROM 15 stores various programs used by the control unit 13. For example, when the control unit 13 is a CPU (central processing unit), a program for realizing the waveform analysis unit 21, the waveform display unit 22, and the cursor display unit 23 in FIG. 2 is stored. The RAM 16 temporarily stores various data used in processing performed by the control unit 13.

  The operation unit 17 includes the operation keys 3 illustrated in FIG. 1 and outputs a user instruction to the control unit 13. Further, when the waveform display device 1 includes an external device connection terminal such as a USB (Universal Serial Bus) terminal, the operation unit 17 informs the control unit 13 of the operation content by the user of the mouse connected to the external device connection terminal. Output. The output unit 18 outputs image data displayed on the display unit 20. Specifically, for example, image data in a state in which an arrow cursor and related information (cursor information and analysis result information) are attached to the waveform data processed by the waveform display unit 22 is output. When only the waveform data is displayed on the display unit 20, only the waveform data can be displayed as image data.

  The display control unit 19 controls display contents displayed on the display unit 20 under the control of the control unit 13. For example, when waveform data is output from the control unit 13, the waveform data is displayed on the display unit 20. When an arrow cursor or related information is output in addition to the waveform data, the arrow cursor or related information is displayed along with the waveform data. The display unit 20 includes the display 4 shown in FIG. 1 and displays various data such as measured waveform data.

  Next, the operation of the waveform measuring apparatus 1 will be described. FIG. 5 is a flowchart showing an operation related to the display of the arrow cursor and cursor information of the waveform measuring apparatus 1. As described above, the cursor information or the analysis result information is associated with the arrow cursor as related information. Hereinafter, the case where the cursor information is associated with the arrow cursor will be described in detail.

  Prior to measurement of the signal under measurement using the waveform measuring apparatus 1, the user turns on the waveform measuring apparatus 1 and operates the operation keys 3 (see FIG. 1) to make various initial settings. For example, various settings such as setting of display contents to be displayed on the display unit 20 such as setting of horizontal and vertical scales and offsets of the display screen W1 on the display unit 20 and setting of display / non-display of the cursor are performed. In this case, it is assumed that the setting (setting of the horizontal arrow cursor display mode) for displaying the vertical cursors C11 and 12 and the arrow cursor C1 extending in the horizontal direction of the display screen W1 shown in FIG. The setting content input by the user operating the operation key 3 is input from the operation unit 17 to the control unit 13, and an initial process corresponding to the setting content is performed.

  When the initial setting is completed and the user electrically connects the tip of the probe connected to at least one of the input terminals 2a to 2e of the input terminal unit 2 provided in the waveform measuring apparatus 1 to the measured part. Data acquisition starts. A signal input from the input terminal T1 shown in FIG. 2 via the probe is sampled and quantized by the A / D converter 11 and binarized, and converted into waveform data which is a digital signal. The waveform data output from the A / D converter 11 is stored in the waveform data memory 12.

  The waveform data stored in the waveform data memory 12 is sequentially read out by the control unit 13, processed into display data by the waveform display unit 22, output to the display control unit 19, and displayed by the display control unit 19. Displayed on the unit 20. With the above processing, a waveform indicating the waveform of the signal under measurement is displayed on the display 4. Here, it is assumed that the waveform WF1 shown in FIG. Further, based on the above-described initial setting, vertical cursors C11 and C12 shown in FIG. 3A are displayed accompanying the waveform WF1.

  Here, when the user operates the operation key 3 to instruct the waveform measuring apparatus 1 to display an arrow cursor, the processing shown in FIG. 5 is started. When the processing is started, first, the cursor display unit 23 determines the horizontal resolution (HResolution: hereinafter referred to as horizontal resolution) and the horizontal offset (HOffset: hereinafter referred to as horizontal offset) of the display screen W1 for the target channel. Obtained (step S11). Here, the horizontal resolution indicates a magnification (sampling period) when a waveform data number (sample number) is converted into a physical value (time). Next, the cursor display unit 23 determines whether or not the instruction given by the user is an instruction to create a new arrow cursor (step S12).

  When it is determined that the arrow cursor is newly created (when the determination result of step S12 is “YES”), information indicating the current horizontal position of the vertical cursors C11 and C12 is displayed from the cursor display unit 23 as a waveform. The waveform data that is output to the analysis unit 21 and within the range defined by the vertical cursors C11 and C12 is read from the waveform data memory 12, and the maximum peak value and the minimum peak of the read waveform data (waveform WF1) are Is detected. The detection result is output from the waveform analysis unit 21 to the cursor display unit 23, and the vertical display position (hereinafter referred to as the vertical display position Y) of the arrow cursor in the display screen W1 is determined (step S13). For example, the vertical display position Y of the arrow cursor is determined so that the arrow cursor is displayed outside the range defined by the maximum peak value and the minimum peak value.

  Next, the cursor display unit 23 determines the positions of both ends of the arrow cursor (hereinafter referred to as end positions X1 and X2) from the information indicating the horizontal positions of the vertical cursors C11 and C12 (step S14). Thereby, as shown in FIG. 3A, the positions of both ends of the arrow cursor C1 are respectively set to the positions of the vertical cursors C11 and C12 in the horizontal direction of the display screen W1. Next, the cursor display unit 23 calculates the length (cursor information) of the arrow cursor using the end positions X1 and X2 of the arrow cursor determined in step S14 and the horizontal resolution and the horizontal offset acquired in step S11. (Step S15).

  When the above processing is completed, under the control of the cursor display unit 23, for example, as shown in FIG. 3A, it is defined by the maximum peak value and the minimum peak value of the waveform WF1 between the vertical cursors C11 and C12. An arrow cursor C1 and cursor information IF1 are displayed outside the range (step S16). At this time, the cursor information IF1 is displayed in the vicinity of the arrow cursor C1, whereby the cursor information IF1 is displayed in a state associated with the arrow cursor C1.

  When the arrow cursor and the cursor information are displayed, the cursor display unit 23 determines whether or not the position of the vertical cursor has been changed by a user operation (step S17). For example, when the user specifies one of the vertical cursors C11 and C12 and rotates the rotary knob, the position of the vertical cursor is changed. If it is determined that the position of the vertical cursor has been changed (when the determination result is “YES”), the process returns to step S14, and the arrow cursor is determined from the information indicating the horizontal positions of the vertical cursors C11 and C12 after the change. The end positions X1 and X2 are newly determined, the length of the arrow cursor is newly calculated in step S15, and the new arrow cursor and cursor information are displayed (step S16).

  On the other hand, when it is determined in step S17 that the position of the vertical cursor has not been changed (when the determination result is “NO”), the cursor display unit 23 changes the vertical display position Y of the arrow cursor by a user operation. It is determined whether or not (step S18). When it is determined that the vertical display position Y of the arrow cursor has been changed (when the determination result is “YES”), the cursor display unit 23 acquires the changed vertical display position Y (step S19), and after the change An arrow cursor and cursor information are displayed at the vertical display position Y (step S16). On the other hand, when it is determined in step S18 that the vertical display position Y of the arrow cursor has not been changed (when the determination result is “NO”), the end positions X1 and X2 of the arrow cursor and the vertical display position Y are determined. Is held by the cursor display unit 23 (step S20), the series of processing ends, and the horizontal arrow cursor display mode is canceled.

  Further, when the user again operates the operation key 3 to set the horizontal arrow cursor display mode for the waveform measuring apparatus 1 and gives a new instruction to display the arrow cursor, FIG. 5 shows. The process starts again. Then, the horizontal resolution and the horizontal offset for the target channel are acquired by the cursor display unit 23 (step S11), and it is determined whether or not the instruction given by the user after that is an instruction to create a new arrow cursor. (Step S12).

  Here, if the instruction given by the user is not an instruction to create a new arrow cursor, the determination result in step S12 is “NO”, and the end positions X1, X2 of the previously held arrow cursor are determined. And the vertical display position Y is acquired by the cursor display part 23 (step S21). Next, the cursor display unit 23 calculates the length (cursor information) of the arrow cursor using the end positions X1 and X2 of the arrow cursor acquired in step S21 and the horizontal resolution and the horizontal offset acquired in step S11. (Step S15).

  When the above processing is completed, under the control of the cursor display unit 23, for example, as shown in FIG. 3A, it is defined by the maximum peak value and the minimum peak value of the waveform WF1 between the vertical cursors C11 and C12. An arrow cursor C1 and cursor information IF1 are displayed outside the range (step S16). After the arrow cursor and the cursor information are displayed, the same processing (steps S17 to S20) as described above is performed. As described above, a plurality of vertical cursors C11 and C12 and an arrow cursor C1 can be displayed by the user instructing to create a new arrow cursor and repeating the process shown in FIG.

  As described above, in the present embodiment, an arrow cursor that points between two different points in the horizontal direction of the display screen W1 (between the vertical cursors C11 and C12) accompanying the waveform WF1 displayed on the display screen W1 of the display unit 20. C1 and cursor information IF1 indicating a physical quantity (time interval) between two points indicated by the arrow cursor C1 are displayed in association with the arrow cursor C1. In addition, the arrow cursor C1 expands and contracts and the content of the cursor information IF1 is updated in conjunction with the position change of the vertical cursors C11 and C12 by the user's operation. For this reason, it is possible to instantly and intuitively grasp the physical information regarding two different points indicated by the arrow cursor, thereby improving user convenience.

  In the above description, the case where the arrow cursor C1 extending in the horizontal direction of the display screen W1 and the cursor information IF1 are displayed in addition to the vertical cursors C11 and C12 has been described. However, in addition to the horizontal cursors C21 and C22, the display screen W1 is displayed. Also in the case of displaying the arrow cursor extending in the vertical direction and the cursor information, the display can be performed by the same processing as the processing shown in FIG. In the above description, the example of operating the rotary knob provided in the operation unit 17 to update the display of the arrow cursor or the like has been described. However, the operation shown in FIG. The arrow cursor etc. can be displayed and updated by almost the same processing.

  FIG. 6 is a diagram for explaining the operation of the arrow cursor using the mouse. Even when the operation is performed using the mouse, various initial settings are performed prior to the measurement of the signal under measurement using the waveform measuring apparatus 1 as in the case where the mouse is not used. Here, it is assumed that the horizontal arrow cursor display mode has been set. However, even when the horizontal arrow cursor display mode is set, when the mouse is used, the vertical cursors C11 and 12 shown in FIG. 3A are not displayed.

  When the initial setting is completed, the user electrically connects the tip of the probe connected to at least one of the input terminals 2a to 2e of the input terminal portion 2 provided in the waveform measuring apparatus 1 to the portion to be measured. The acquisition of waveform data is started, and the waveform indicating the waveform of the signal under measurement is displayed on the display 4 as in the above-described embodiment. Here, it is assumed that the waveform WF2 shown in FIG.

  Here, when the user performs a double-click operation or a drag-and-drop operation on the mouse while the mouse pointer P1 is disposed at an arbitrary position in the display 4, the user's desired position in the display 4 is displayed. An arrow cursor C2 is displayed at the same time, and cursor information IF2 corresponding to the length of the arrow cursor C2 is displayed in the vicinity of the arrow cursor C2. In the example shown in FIG. 6A, “1.4 ms” is displayed as the cursor information. Note that the length of the arrow cursor C2 in the initial state may be set to a fixed value in advance, or may be varied according to the horizontal resolution or the like.

  Next, when the user operates the mouse to place the mouse pointer P1 at one end of the arrow cursor C2, the shape of the mouse pointer P1 changes. In the example shown in FIG. 6B, the mouse pointer P1 is arranged at the right end portion of the arrow cursor C2, and is changed to an arrow shape extending in the horizontal direction with arrows attached to both end portions. When the user performs a drag operation on the mouse while the shape of the mouse pointer P1 is changed, the arrow cursor C2 expands and contracts and the content of the cursor information IF2 is changed according to the user operation.

  When the user performs a drop operation on the mouse, as shown in FIG. 6C, the position of the right end portion of the arrow cursor C2 is fixed to the display position of the mouse pointer P1 when the drop operation is performed. Further, the value of the cursor information IF2 is fixed to the length of the arrow cursor C2 when the position is fixed. When such a drop operation is performed, the shape of the mouse cursor P1 returns to the original shape. As described above, a plurality of arrow cursors can be displayed by the user performing a double-click operation or a drag-and-drop operation on the mouse and repeating the above operation.

  Here, since the horizontal arrow cursor display mode is set, when the above drag operation is performed, as shown in FIG. 6D, the user moves the mouse pointer P1 in the diagonal direction D1 of the display screen with respect to the mouse. Even if the operation to move is performed, the expansion / contraction direction of the arrow cursor C2 is restricted to only the horizontal direction. Similarly, when the vertical arrow cursor display mode is set, the expansion / contraction direction of the arrow cursor is restricted to the vertical direction only. That is, as shown in FIG. 6E, even when the user performs an operation of moving the mouse pointer P1 in the diagonal direction D2 of the display screen with respect to the mouse, the expansion / contraction direction of the arrow cursor C3 extending in the vertical direction of the display screen is vertical. Regulated only in direction.

  In the above description, the cursor information is displayed in the vicinity of the arrow cursor so that the cursor information and the arrow cursor are associated with each other. However, as the display for associating the cursor information with the arrow cursor, other displays are possible. It is also possible to use a method. FIG. 7 is a diagram illustrating another display example of the cursor information. First, as shown in FIG. 7A, consider a case where an arrow cursor C extending in the vertical direction is displayed along with the waveform WF. In such a case, if the cursor information IF is simply displayed in the vicinity of the arrow cursor C, the cursor information IF overlaps with the waveform WF, and the visibility of the cursor information IF deteriorates.

  Therefore, the waveform WF is analyzed to obtain the maximum peak value and the minimum peak value or envelope of the waveform WF, and as shown in FIG. 7B, the range or envelope defined by the maximum peak value and the minimum peak value. The cursor information IF may be displayed outside the range defined by the line. When such display is performed, the cursor information IF is displayed at a position away from the arrow cursor C. Therefore, by displaying a lead line L extending from the arrow cursor C to the display position of the cursor information IF, the cursor information and the arrow cursor are displayed. Associate.

  Here, when the display shown in FIG. 7B is performed, there is a possibility that the display process becomes complicated, and that it is difficult to see the display itself because the lead line L needs to be displayed. For this reason, when the cursor information IF overlaps with the waveform WF when displayed in the vicinity of the arrow C, the background of the cursor information IF is displayed in white as shown in FIG. You may perform the display which attaches. By performing such display, it is possible to prevent the display process from becoming complicated and the visibility of the cursor information IF from being deteriorated, and the association between the cursor information and the arrow cursor is not impaired.

  In the above description, the arrow cursor that extends in the horizontal direction of the display screen and restricts the expansion / contraction direction when the mouse is operated in the horizontal direction, and the expansion / contraction direction when the mouse is operated in the vertical direction of the display screen is the vertical direction. An example of individually displaying the regulated arrow cursor has been described. However, these arrow cursors may be combined to enable both expansion and contraction by a single mouse operation.

  FIG. 8 is a diagram illustrating a combination example of an arrow cursor extending in the vertical direction and an arrow cursor extending in the horizontal direction. As shown in FIG. 8, when the user performs an operation of moving the mouse pointer P1 in the oblique direction D3 of the display screen with respect to the mouse, the arrow cursor C4 expands and contracts by the amount of the horizontal movement of the mouse pointer P1, and the mouse pointer. The arrow cursor C5 expands and contracts by the vertical movement of P1. Then, the contents of the cursor information IF4 corresponding to the arrow cursor C4 are updated in conjunction with the expansion / contraction of the arrow cursor C4, and the contents of the cursor information IF5 corresponding to the arrow cursor C5 are updated in conjunction with the expansion / contraction of the arrow cursor C5. .

  Further, in the above description, the example in which the arrow cursor and the cursor information are displayed along with the waveform obtained from one channel has been described. However, the arrow cursor and the cursor information are displayed on the waveform obtained from a plurality of channels. You may display. FIG. 9 is a diagram showing a display example of an arrow cursor and cursor information for waveforms obtained from a plurality of channels. In the example shown in FIG. 9, waveforms WF4 and WF5 of different channels are displayed side by side in the vertical direction of the display screen, and an arrow cursor C6 and an arrow cursor C6 extending in the vertical direction of the display screen are displayed between these waveforms WF4 and WF5. Corresponding cursor information IF6 is displayed. One end (upper end) of the arrow cursor C6 is associated with the waveform WF4, and the other end (lower end) of the arrow cursor C6 is associated with the waveform WF5.

  As shown in FIG. 9, when the user operates the mouse to drag the arrow cursor C6 in the direction D4 in the figure, one end (upper end) of the arrow cursor C6 moves along the waveform WF4. The other end (lower end) of the cursor C6 moves along the waveform WF5, whereby the arrow cursor C6 continuously expands and contracts. Further, in conjunction with the expansion / contraction of the arrow cursor C6, the value of the cursor information IF6 corresponding to the arrow cursor C6 is updated. By performing such display, it becomes easy to grasp the change in the length of the arrow cursor and the change in the measurement value with respect to the movement of the arrow cursor C6, and it is easy to specify the position of the waveform from which the desired measurement value is obtained. Become.

  Furthermore, the waveform measuring apparatus 1 can output image data displayed on the display unit 20 (display 4) from the output unit 18. That is, it is possible to output image data with an arrow cursor and cursor information attached to the waveform data processed by the waveform display unit 22. Conventionally, only the output of the waveform image data displayed on the display unit 20 (display 4) was possible. Therefore, when the image data obtained from the waveform measuring apparatus 1 is used as a presentation or report material, etc. It was necessary to add annotations such as arrows and auxiliary lines. On the other hand, the image data output from the waveform measuring apparatus 1 has an advantage that the arrow data and the cursor information are attached to the waveform data, so that it can be used as it is as a document.

  The operation when the cursor information is displayed in association with the arrow cursor has been described in detail above, but the analysis result information can also be associated with the arrow cursor by the same processing. Specifically, in the flowchart shown in FIG. 5, the process of step S13 is omitted, and in addition to the calculation of the length of the arrow cursor in the process of step S15, the waveform analysis unit 21 performs the analysis process, and the process of step S16 Is replaced with the process of “displaying the arrow cursor and analysis result information”, the analysis result information is displayed in association with the arrow cursor. By repeating this process, a plurality of arrow cursors and cursor information can be displayed as shown in FIG. Further, when it is desired to readjust the analysis item or the analysis range after displaying the arrow cursor and the cursor information, the arrow cursor to be readjusted is specified by operating the rotary knob or the like, and the flowchart shown in FIG. 5 is executed. .

  In the case of an operation using a mouse, instead of updating the display of an arrow cursor or the like by operating a rotary knob provided in the operation unit 17, the same operation as that shown in FIG. The arrow cursor and the analysis result information can be updated. Here, even when the arrow cursor and the analysis result information are displayed, when the user performs an operation of moving the mouse pointer in the diagonal direction of the display screen with respect to the mouse, as described with reference to FIG. The expansion / contraction direction of the arrow cursor may be restricted to only the horizontal direction.

  Further, when the analysis result information overlaps with the waveform, the analysis result information is displayed at a position not overlapping with the waveform and is extended from the arrow cursor to the display position of the analysis result information, as in the case described with reference to FIG. The analysis result information and the arrow cursor may be associated with each other by displaying a line, or the background of the analysis result information may be displayed in white. In addition, as shown in FIGS. 4 and 9, when waveforms are obtained from a plurality of channels, an arrow cursor common to these waveforms may be set. By performing such setting, it is possible to perform an analysis such as obtaining a difference between the maximum values of a plurality of waveforms within a range defined by the arrow cursor. Further, when the analysis result information is displayed, the image data displayed on the display unit 20 (display 4) can be output from the output unit 18 in the same manner as when the cursor information is displayed.

  Here, although the case where the analysis result information is displayed as a numerical value has been described in the above embodiment, the analysis result information may be displayed in a graph. FIG. 10 is a diagram illustrating a graph display example of analysis result information. In the example shown in FIG. 10A, the arrow cursor C61 is set over several cycles of the waveform WF21 of the digital signal, and the histogram G1 of the waveform data forming the waveform WF21 within the range defined by the arrow cursor C61. Is displayed in association with the arrow cursor C61. By referring to this histogram G1, the user can instantly and intuitively understand the variation in the voltage value of the “H” level and the voltage value of the “L” level for the waveform WF21.

  In the example shown in FIG. 10B, the arrow cursor C62 is set for the waveform WF22 of the digital signal, and the analysis result information IF62 and the graph G2 of the waveform WF22 within the range defined by the arrow cursor C62. Is displayed in association with the arrow cursor C62. As the analysis result information IF62, the average value (Mean) and standard deviation (σ) of the variation of the period are displayed as numerical values, and a distribution diagram showing the distribution of the variation of the period is displayed as the graph G2. . By referring to the analysis result information IF62 and the graph G2, the user can instantly and intuitively grasp the tendency of the variation in the period of the waveform WF22.

  Furthermore, in the example shown in FIG. 10 (c), an arrow cursor C63 is set for the waveform WF23 obtained by superimposing the waveforms of the analog signal over the past several cycles, and within the range defined by the arrow cursor C63. The analysis result information IF63 and the graph G3 of the waveform WF23 are displayed in association with the arrow cursor C63. As the analysis result information IF63, the average value (Mean) and standard deviation (σ) of the frequency variation are displayed as numerical values, and as the graph G3, a distribution diagram showing the distribution of the frequency variation is displayed. . By referring to the analysis result information IF63 and the graph G3, the user can instantly and intuitively grasp the tendency of the frequency variation of the waveform WF23.

  The waveform display device according to one embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and can be freely changed within the scope of the present invention. For example, in the above-described embodiment, the aspect in which the waveform display device of the present invention is incorporated in an oscilloscope that is a kind of waveform display device has been described. However, the waveform display device of the present invention can be incorporated in an analysis device that analyzes waveform data obtained by the waveform measurement device, and can also be applied as a waveform analysis tool incorporated in a computer. Is possible.

  Further, in the above-described embodiment, the explanation has been given by taking the arrow cursor whose both ends are arrows as an example. However, both ends of the cursor (line segment cursor) do not necessarily have to be arrows, and the shape may be arbitrary. In the above description, the analysis performed by the waveform analysis unit 21 is exemplified by the analysis for obtaining the maximum value and the minimum value of the waveform, and the analysis for obtaining the variation of the signal period and frequency. The present invention is not limited to the above analysis, and any analysis can be handled. For example, it is possible to analyze a serial bus. When the serial bus is FlexRay (registered trademark), BBS (Byte Start Sequence) time interval measurement, BSS-FES (Frame End Sequence) time interval, etc. can be displayed as analysis result information as analysis results. .

It is a front view of a waveform measuring apparatus provided with the waveform display apparatus by one Embodiment of this invention. It is a block diagram which shows the principal part structure of a waveform measuring apparatus provided with the waveform display apparatus by one Embodiment of this invention. It is a figure which shows the example of a display of an arrow cursor and cursor information. It is a figure which shows the example of a display of an arrow cursor and analysis result information. 3 is a flowchart showing an operation related to display of an arrow cursor and cursor information of the waveform measuring apparatus 1; It is a figure for demonstrating operation of the arrow cursor using a mouse | mouth. It is a figure which shows the other example of a display of cursor information. It is a figure which shows the example of a combination of the arrow cursor extended in the vertical direction, and the arrow cursor extended in a horizontal direction. It is a figure which shows the example of a display of the arrow cursor and cursor information with respect to the waveform obtained from the several channel. It is a figure which shows the example of a graph display of analysis result information. It is a figure which shows the example of a display of the conventional cursor, Comprising: (a) is a figure which shows the example of a display of a linear cursor.

Explanation of symbols

18 Output unit 21 Waveform analysis unit 23 Cursor display unit C Arrow cursor C1 to C6 Arrow cursor C11, C12 Arrow cursor C30 Arrow cursor C40 Arrow cursor C50 Arrow cursor G1 Histogram G2, G3 Graph IF cursor information IF1 to IF6 Cursor information IF11, IF12 Cursor information IF30 Analysis result information IF40 Analysis result information IF50 Analysis result information IF62, IF63 Analysis result information L Lead line WF waveform WF1-WF5 waveform WF11, WF12 waveform WF21-WF23 waveform

Claims (11)

In a waveform display device that displays at least one waveform and displays a cursor and related information related to the cursor in association with the waveform,
A line cursor whose one end functions as a first cursor and the other end functions as a second cursor different from the first cursor is displayed, and related information related to the line cursor is associated with the line cursor. A waveform display device comprising a cursor display unit for displaying in a state in which   The waveform display device according to claim 1, wherein the cursor display unit expands and contracts the line segment cursor according to a user instruction, and updates the related information in accordance with the expansion and contraction of the line segment cursor.   The waveform display device according to claim 2, wherein the cursor display unit restricts an expansion / contraction direction of the line segment cursor to at least one of two directions intersecting each other.   The waveform display device according to any one of claims 1 to 3, wherein the cursor display unit displays the related information in the vicinity of the line segment cursor.   The cursor display unit displays the related information at a position that does not overlap the waveform, and displays a lead line extending from the line segment cursor to the display position of the related information. Item 4. The waveform display device according to any one of Items 3 to 3.   6. The waveform display device according to claim 1, further comprising: an output unit that outputs image data in a state where the line segment cursor and the related information are associated with the waveform. .   The waveform display apparatus according to claim 1, wherein the related information is cursor information related to the cursor. A waveform analysis unit for analyzing the waveform;
The said related information is the analysis result information which shows the analysis result of the said waveform analysis part within the range prescribed | regulated by the said line segment cursor. The claim 1 characterized by the above-mentioned. Waveform display device.   The waveform display device according to claim 8, wherein the cursor display unit displays the related information as an analysis result of the waveform analysis unit in a graph.   The said cursor display part displays the said line segment cursor and the said relevant information for every said waveform, when the said waveform is displayed in multiple numbers, The said any one of Claims 1-9 characterized by the above-mentioned. The waveform display device described.   11. The waveform display device according to claim 1, wherein the cursor display unit is capable of displaying a plurality of the line segment cursor and the related information for one waveform. .

Images