JP5501869B2 - Waveform display device and waveform display method - Google Patents

Description

  The present invention displays a waveform to be measured on the display unit based on the waveform data of the waveform to be measured, and also displays a waveform on the display unit by specifying one point on the waveform to be measured designated by the designation operation as a search point. The present invention relates to an apparatus and a waveform display method.

  As this type of waveform display device, a waveform display device disclosed in Patent Document 1 below is known. This waveform display device includes an operation unit as an interface for a user to perform an operation, and the operation unit is provided with various keys and switches for operation. For example, a pointing device for specifying a desired position or range by moving a mark, a line, a region, or the like such as a cursor on the display unit screen is provided. In this waveform display device, a mouse, a light pen, a touch panel, or the like can be used as a pointing device.

JP 2002-333454 A (page 6, FIG. 1)

  However, the following problems exist in the above waveform display device. That is, in the conventional waveform display device, the user can search for an arbitrary point on the measured waveform displayed on the screen by using a pointing device such as a mouse, light pen, or touch panel as described above. And the level value of the waveform to be measured at the search point can be measured. However, with a mouse, light pen, or touch panel, the resolution of the designated position is low, so it is difficult to accurately specify a desired position on the waveform to be measured. In the field of waveform measurement, measuring the level value (extreme value) of any one extreme point of a measured waveform having a plurality of extreme points (maximum points or minimum points) is performed. In this waveform display device, since it is difficult to accurately specify a desired position on the waveform to be measured as a search point, the level value of a desired extreme point cannot be measured accurately. It is desired.

  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 that can accurately specify an arbitrary pole point on a waveform to be measured as a search point.

In order to achieve the above object, the waveform display device according to claim 1, wherein a waveform to be measured showing a change of the second parameter with respect to a change of the first parameter is expressed with respect to the first parameter axis for the first parameter and the second parameter. A display unit for displaying within a coordinate plane constituted by the second parameter axis, and a processing unit for specifying one point on the measured waveform designated by a designation operation as a search point and displaying the point on the display unit A waveform display device, comprising: a coordinate detection unit that detects, as a designated coordinate, a coordinate of the first parameter axis for a designated position in the coordinate plane designated by the designation operation, and the processing unit includes the display A process of searching for at least one of a local maximum point and a local minimum point for the waveform to be measured displayed in the section, and the coordinates When the output unit entered the designated coordinates, when the coordinates of the first parameter axis about the pole point that the search is included in the reference range predetermined including the specified coordinates, the first When the coordinates of the poles closest to the designated coordinates are specified as the search points , the coordinates of the first parameter axes for the searched poles are not included in the reference range. A point on the designated coordinate in the waveform is specified as the search point .

Waveform display apparatus of claim 2, in the waveform display device according to claim 1 Symbol placement, and an operation section for outputting setting data defining the reference range.

4. The waveform display method according to claim 3 , wherein a measured waveform indicating a change in the second parameter with respect to a change in the first parameter is constituted by a first parameter axis for the first parameter and a second parameter axis for the second parameter. A waveform display method for specifying and displaying one point on the measured waveform designated by the designation operation as a search point in the state displayed in the coordinate plane, wherein the coordinates designated by the designation operation are displayed. Detecting the coordinates of the first parameter axis for a specified position in a plane as specified coordinates, searching for at least one of the maximum and minimum points for the displayed waveform under measurement, when detecting the coordinates is predetermined group including the designated coordinate of the first parameter axis about the pole point as the search When contained within the range, the coordinates of the first parameter axis identifies the coordinates of the nearest pole to the designated coordinates as the search point, coordinates the reference of the first parameter axis of pole that the search When not included in the range, a point on the designated coordinate in the measured waveform is specified as the search point .

In the waveform display device according to claim 1 and the waveform display method according to claim 3 , the coordinates of the first parameter axis for the designated position in the coordinate plane designated by the designation operation are detected and displayed as designated coordinates. In a state where at least one of the local maximum point and the local minimum point of the measured waveform is searched, when the designated coordinate is detected, the coordinates of the first parameter axis for the extreme point are specified from the searched extreme points. The pole closest to the coordinates is specified as the search point. Therefore, according to this waveform display device and waveform display method, when this extreme point is specified in order to measure the second parameter at the desired extreme point of the waveform to be measured displayed on the display unit, the designated position is the desired position. Even if it deviates from the pole, the pole closest to the specified position can be specified as the search point. Usually, the designated position that is actually designated is considered to be the closest to the desired pole among all the poles, and as a result, the desired pole can be reliably identified as the search point, An accurate second parameter of the desired pole can be measured.

Also, when it contains the nearest pole of coordinates within the reference range predetermined comprising specifying coordinates identifies a pole as a search point, it contains the nearest pole of coordinates within the reference range If not, a point on the designated coordinate in the measured waveform is specified as a search point. Therefore, according to this waveform display device, the user can intentionally deviate from the extreme point and designate the designated position, thereby making it possible to search for a point other than the extreme point of the measured waveform. Can also be measured.

In addition, according to the waveform display device of the second aspect , by providing the operation unit for outputting the setting data for defining the reference range, the interval between the extreme points of the waveform to be measured displayed on the display unit can be increased or decreased. Accordingly, the user can arbitrarily define the reference range. Therefore, according to the waveform display device, the reference range can be widened when the interval between the extreme points is wide, and the reference range can be narrowed when the interval between the extreme points is narrow. It can be specified as a point.

1 is a configuration diagram showing a configuration of a waveform display device 1. FIG. It is explanatory drawing of the state which displayed the designated position A and the reference range Xref with the spectrum waveform Ws on the screen 11. FIG. It is explanatory drawing of the state which displayed the cursor 13 on the screen 11 in the searched search point Pse with the spectrum waveform Ws. It is explanatory drawing of the state which displayed the other designated position A and the other reference range Xref with the spectrum waveform Ws on the screen 11. FIG. It is explanatory drawing of the state which displayed the cursor 13 on the screen 11 in the other search point Pse searched with the spectrum waveform Ws. 4 is a flowchart for explaining an operation in a search point display process 50 of the waveform display device 1. 7 is a flowchart for explaining an operation of the waveform display device 1 in a cursor display process 53 of FIG. 6.

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

  First, the configuration of the waveform display device 1 will be described with reference to the drawings. As shown in FIG. 2, a coordinate plane composed of a frequency axis (corresponding to the first parameter axis, in this example, the X axis) and a level axis (corresponding to the second parameter axis, in this example, the Y axis). A spectrum waveform Ws indicating a change in the level (corresponding to the second parameter) of a physical quantity (for example, impedance) with respect to a change in frequency (corresponding to the first parameter) in the (XY plane) is taken as an example of the waveform to be measured. explain.

  The waveform display device 1 shown in FIG. 1 includes a processing unit 2, a storage unit 3, an operation unit 4, and a display unit 5, and displays a spectrum waveform based on the input waveform data Ds on the screen 11 of the display unit 5, At least one of the maximum points and the minimum points of the spectrum waveform (in this example, as an example, the maximum point and the minimum point) can be searched. Further, in this example, one waveform data Ds includes, for example, level data indicating the level of the spectrum waveform Ws and frequency data indicating the frequency at which the level data is measured.

  The processing unit 2 is configured to include a CPU and an internal memory (both not shown), execute a waveform data Ds storage process, and perform a waveform display process based on an operation instruction Ss input from the operation unit 4. Execute. The processing unit 2 executes a search point display process and a control process for the display unit 5. The storage unit 3 includes a semiconductor memory, an HDD (Hard Disk Drive), and the like, stores the waveform data Ds, and functions as a work memory for the processing unit 2. The storage unit 3 stores an operation program for the processing unit 2 in advance. The storage unit 3 stores the reference length L when a reference length L for defining the reference range Xref used in the search point display process is set by an operation on the operation unit 4. The operation unit 4 is configured with, for example, a keyboard and outputs an operation instruction Ss to the processing unit 2. The operation unit 4 is configured to be capable of setting a reference length L for defining the reference range Xref, and outputs the reference length L (setting data) when the operation is performed.

  The display unit 5 includes an LCD (Liquid Crystal Display) as an example. Further, the display unit 5 displays the spectrum waveform Ws on the screen 11 of the LCD panel 5a in the LCD as shown in FIG. As an example, the display unit 5 displays a waveform display frame 12 on the screen 11 and displays a spectrum waveform Ws represented by the waveform data Ds in the waveform display frame 12. In this example, the display unit 5 uses the lower side of the waveform display frame 12 as the horizontal axis indicating the frequency (X axis corresponding to the first parameter axis), and the left side of the waveform display frame 12 indicates the level value of the waveform data Ds. The spectrum waveform Ws is displayed as a level axis (Y axis corresponding to the second parameter axis). The LCD panel 5a is configured as a coordinate detection unit by incorporating a touch panel (not shown).

  With this configuration, the LCD panel 5a has the coordinates of one designated position A designated on the screen 11 with a finger or pen (in the XY coordinate system having the origin O as the lower left corner of the waveform display frame 12 as an example). X, Y coordinates) is detected and output as coordinates (Xa, Ya), and the display unit 5 uses the X coordinates Xa of the coordinates (Xa, Ya) as the designated coordinates of the designated position A. Output to 2. In this case, as described above, since the lower frame of the waveform display frame 12 as the X axis is the frequency axis, the designated coordinate Xa indicates the frequency value at the designated position A. In addition, the display unit 5 displays a cursor 13 (in the present example, an alternate long and short dash line: see FIG. 3) formed of vertical lines (vertical lines parallel to the Y axis) on the X coordinate Xa of the designated position A. For example, the display unit 5 displays a numerical value display frame 14 in the waveform display frame 12 and displays the level value of the spectrum waveform Ws at the position of the cursor 13 in the numerical value display frame 14.

  Next, the operation of the waveform display device 1 will be described with reference to the drawings.

  In the operating state, the processing unit 2 first shifts to a state waiting for input of the waveform data Ds. In this state, when the waveform data Ds is supplied from the outside in this state, the processing unit 2 executes storage processing, inputs the waveform data Ds, and stores the input waveform data Ds in the storage unit 3. In addition, after the storage process is completed, the processing unit 2 shifts to an input waiting state in which the operation unit Ss is input from the operation unit 4.

  Next, when the reference length L (setting data: for example, the length along the frequency axis on the screen 11 is 10 mm) is output from the operation unit 4 in this state, the processing unit 2 outputs the reference length. After storing L in the storage unit 3, the state shifts to an input waiting state in which the operation instruction Ss from the operation unit 4 is input. Subsequently, when the processing unit 2 inputs an operation instruction Ss for starting waveform display from the operation unit 4, the processing unit 2 executes waveform display processing. In this waveform display process, the processing unit 2 reads the waveform data Ds from the storage unit 3 and, based on the read waveform data Ds, the waveform display frame 12 on the screen 11 of the display unit 5 as shown in FIG. The spectral waveform Ws is displayed over the entire frequency axis. Thereby, the waveform display process for displaying the spectrum waveform Ws along the frequency axis in which the frequency increases from the left side to the right side is completed, and the processing unit 2 waits for an input of the operation instruction Ss from the operation unit 4. Transition to the state.

  Subsequently, when the operation unit Ss of the first search instruction is input from the operation unit 4 in this state, the processing unit 2 executes a search point display process 50 shown in FIG. In the search point display processing 50, the processing unit 2 first detects all the extreme points P (maximum point Pmax and minimum point Pmin) existing in the spectrum waveform Ws based on the waveform data Ds (becomes the extreme points P). The waveform data Ds is specified), and the waveform data Ds is stored in the internal memory corresponding to each detected pole P (step 51). In this case, as a method for detecting the maximum point and the minimum point, various methods such as a method of sequentially comparing and detecting level data values in two waveform data Ds that are in chronological order can be adopted. it can. Further, the processing unit 2 specifies the X coordinate Xp for each detected pole P, and stores it in the internal memory in association with the detected pole P. In this example, as an example, as shown in FIG. 2, there are three local maximum points Pmax and three local minimum points Pmin in the spectrum waveform Ws. For this reason, when the X coordinate Xp of each pole P is set to Xp1, Xp2, Xp3, Xp4, Xp5, Xp6 (hereinafter also referred to as Xp unless otherwise distinguished) from the origin O side, X coordinates Xp1 to Xp6 are stored in the storage unit 3.

  Next, the processing unit 2 detects whether or not the operation instruction Ss indicating the search end instruction is input from the operation unit 4 (step 55), and detects whether or not the X coordinate Xa is input from the display unit 5. The process proceeds to a state in which (Step 52) is repeatedly executed. In this state, when the designated position A is designated on the screen 11 with a finger or a pen, the display unit 5 outputs the X coordinate Xa to the processing unit 2. Accordingly, the processing unit 2 executes display processing for displaying the cursor 13 on the display unit 5 in order to input the X coordinate Xa from the display unit 5 (step 53).

  In this display process, as shown in FIG. 7, the processing unit 2 first includes the X coordinate Xa based on the reference length L read from the storage unit 3 and the X coordinate Xa input from the display unit 5, and A reference range Xref in which the length along the frequency axis is the reference length L is defined (step 61). In this example, as an example, the processing unit 2 defines the reference range Xref with the X coordinate Xa as the center. That is, the reference range Xref is defined to be ± L / 2 with respect to the X coordinate Xa. Note that the present invention is not limited to this configuration, and the range of the reference range Xref with respect to the position of the X coordinate Xa (the horizontal width of the X coordinate) can be arbitrarily defined as long as the X coordinate Xa is included in the range.

  Next, the processing unit 2 compares the defined reference range Xref and the X coordinates Xp (Xp1 to Xp6) read from the storage unit 3 to determine whether or not there is an X coordinate Xp included in the reference range Xref. A determination is made (step 62). Subsequently, as a result of the determination, when the processing unit 2 determines that the X coordinate Xp included in the reference range Xref is 1 or 2 or more, the X coordinate Xp closest to the X coordinate Xa of the X coordinates Xp Is specified, and one extreme point P of the specified X coordinate Xp is specified as a search point Pse (step 63). On the other hand, when the processing unit 2 determines that no X coordinate Xp is included in the reference range Xref as a result of the determination in step 62, the point of the X coordinate Xa on the spectrum waveform Ws is used as the search point Pse. Specify (step 64).

  Subsequently, after specifying the search point Pse in Step 63 or Step 64, the processing unit 2 displays the cursor 13 at the search point Pse (Step 65). Thus, the cursor display process 53 is completed.

  The cursor display processing 53 will be described with a specific example. For example, as shown in FIG. 2, when one X coordinate Xp (X coordinate Xp2) is included in the reference range Xref, the processing unit 2 has the X coordinate Xp2 closest to the X coordinate Xa. The extreme point P (maximum point Pmax) of the X coordinate Xp2 is specified as the search point Pse. Although not shown, when two or more X coordinates Xp are included in the reference range Xref, the processing unit 2 specifies the X coordinate Xp closest to the X coordinate Xa among these X coordinates Xp, The specified extreme point P of the X coordinate Xp is specified as the search point Pse. Next, as shown in FIG. 3, the processing unit 2 displays a cursor 13 at the search point Pse.

  On the other hand, as shown in FIG. 4, when no X coordinate Xp is included in the reference range Xref, the processing unit 2 specifies the point of the X coordinate Xa on the spectrum waveform Ws as the search point Pse, As shown in FIG. 5, the cursor 13 is displayed at the search point Pse.

  After executing the cursor display process 53, the processing unit 2 executes a process of displaying the level value of the search point Pse as shown in FIG. 6 (step 54). In this process, the processing unit 2 displays the level value indicated by the level data constituting the waveform data Ds of the search point Pse as a numerical value in the numerical value display frame 14 as shown in FIGS. In FIG. 3, since the extreme point P is the search point Pse, the numerical value displayed in the numerical value display frame 14 is the level value of the extreme point (that is, the extreme value). The processing unit 2 repeatedly executes the above steps 52, 53, and 54 until the input of the operation instruction Ss indicating the search end instruction is detected in the above step 55. On the other hand, when detecting the input of the operation instruction Ss for the search end instruction in step 55, the processing unit 2 ends the search point display process 50.

  Thus, in this waveform display device 1, the LCD panel 5a in which the touch panel is incorporated is the X coordinate of the frequency axis (parameter axis) for the designated position A designated on the screen 11 of the display unit 5 by the user's designated operation. Xa is detected as a designated coordinate, and when the display unit 5 outputs the X coordinate Xa to the processing unit 2 and the processing unit 2 inputs the X coordinate Xa from the display unit 5, each pole P of the spectrum waveform Ws. Among them, the pole P whose X axis Xp of the frequency axis is closest to the X coordinate Xa is specified as the search point Pse.

  Therefore, according to this waveform display device 1, when the user designates this extreme point P on the screen 11 in order to measure the level value of the desired extreme point P of the spectrum waveform Ws displayed on the screen 11, the designation is made. Even if the position A deviates from the desired pole P, the pole P closest to the designated position A can be specified as the search point Pse. Normally, the designated position A actually designated is considered to be the closest to the desired pole P among all the poles P. As a result, the desired pole P can be reliably specified as the search point Pse. This makes it possible to measure the exact level value of the desired pole P based on the level value displayed in the numerical value display frame 14.

  Further, in this waveform display device 1, the processing unit 2 has the X coordinate Xp of the frequency axis for the closest pole (desired pole) P within a predetermined reference range Xref including the X coordinate Xa of the designated position A. Is included as the search point Pse, and when the coordinate of the frequency axis for the closest pole P is not included in the reference range Xref, the X coordinate in the spectrum waveform Ws The point of Xa is specified as the search point Pse.

  Therefore, according to this waveform display device 1, when the user intentionally shifts from the pole P and designates the designated position A, a point other than the pole P of the spectrum waveform Ws can be set as the search point Pse. The level value of the point Pse can also be measured.

  In addition, according to the waveform display device 1, since the operation unit 4 that outputs the reference length L that defines the reference range Xref is provided, the interval between the extreme points P of the spectrum waveform Ws displayed in the waveform display frame 12. The user can arbitrarily define the reference range Xref according to the width of the. Therefore, according to the waveform display device 1, the reference range Xref can be widened when the interval between the poles P is wide, and the reference range Xref can be narrowed when the interval between the poles P is narrow. P can be more accurately specified as the search point Pse.

  In addition, although it mentioned above about the example which employ | adopted the structure which prescribe | regulates the reference | standard range Xref based on the reference length L set by the user, the reference length L was previously memorize | stored in the memory | storage part 3, and based on the reference length L A configuration that defines the reference range Xref may be employed. In this case, when the designated position A is designated by a finger or a pen, the reference length L is preliminarily defined as a length that is assumed to be included in the range of the reference length L. preferable.

  In addition, the configuration in which a desired one of the local maximum points and the local minimum points existing in the spectrum waveform Ws is used as the search point has been described above. In step 51, only one selected from the local maximum point and the local minimum point is detected. By adopting such a configuration, it is possible to adopt a configuration in which one of the maximum point and the minimum point is specified as the search point Pse.

  Further, a physical quantity (impedance in the above example) as a second parameter with respect to a change in frequency as a first parameter in a coordinate plane composed of a frequency axis as a first parameter axis and a level axis as a second parameter axis The example applied when displaying the spectrum waveform Ws as the waveform to be measured indicating the level change of the above has been described above, but various physical quantities such as the voltage value, current value, power value, resistance value, and temperature as the second parameter. Needless to say, the present invention can be applied to display a waveform indicating a change in level. In addition, a waveform showing a change over time in the level of various physical quantities such as a voltage value, a current value, a power value, a resistance value, an impedance, and a temperature in a coordinate plane composed of a time axis and a level axis as a first parameter axis. Of course, it can be applied when displaying the. Further, it is possible to employ a configuration in which a data conversion unit that converts a signal waveform (a waveform to be measured) into waveform data Ds and a signal waveform as an analog signal is input.

  Further, the example using the LCD panel 5a in which the touch panel is incorporated as the coordinate detection unit has been described above. However, the mouse is used, and the processing unit 2 moves the cursor on the LCD or CRT screen based on the signal from the mouse. By adopting a configuration that displays another cursor different from 13 (an arrow-shaped cursor as an example), the processing unit 2 functions as a coordinate detection unit and recognizes the position of this other cursor as the designated position A. The X coordinate Xa of the designated position A can be set as the designated coordinate Pse. Further, by adopting a configuration in which the display unit 5 is configured with a CRT and a light pen is used, the processing unit 2 functions as a coordinate detection unit, and recognizes the contact position of the light pen on the CRT as the designated position A. Then, the X coordinate Xa of the designated position A can be set as the designated coordinate Pse.

DESCRIPTION OF SYMBOLS 1 Waveform display apparatus 2 Processing part 3 Memory | storage part 5 Display part 5a LCD panel 11 Screen 13 Cursor A Specified position Ds Waveform data Pse Search point Ws Spectral waveform

Claims (3)

A display unit for displaying a measured waveform indicating a change in the second parameter with respect to a change in the first parameter in a coordinate plane constituted by a first parameter axis for the first parameter and a second parameter axis for the second parameter. When,
A waveform display device comprising: a processing unit that specifies a point on the measured waveform designated by a designation operation as a search point and displays the point on the display unit;
A coordinate detector that detects the coordinates of the first parameter axis for the designated position in the coordinate plane designated by the designation operation as designated coordinates;
The processing unit executes a process of searching for at least one of a local maximum point and a local minimum point for the measured waveform displayed on the display unit, and inputs the designated coordinates from the coordinate detection unit. when, when the coordinates of the first parameter axis about the pole point that the search is included within a predetermined reference range including the specified coordinates, coordinates the designated coordinates of the first parameter axis If the coordinates of the first parameter axis for the searched extreme point are not included in the reference range, a point on the designated coordinate in the measured waveform is specified. A waveform display device that identifies the search point as the search point . Waveform display apparatus of claim 1 Symbol placement and an operation section for outputting setting data defining the reference range. A state in which a waveform to be measured showing a change in the second parameter with respect to a change in the first parameter is displayed in a coordinate plane composed of the first parameter axis for the first parameter and the second parameter axis for the second parameter A waveform display method for specifying and displaying one point on the measured waveform specified by the specifying operation as a search point,
Detecting the coordinates of the first parameter axis for the designated position in the coordinate plane designated by the designation operation as designated coordinates;
Searching at least one of the pole of the maximum point and minimum point of the waveform to be measured being the display, upon detecting the designated coordinates, the coordinates of the first parameter axis about the pole point as the search Is included in a predetermined reference range including the designated coordinates, the coordinates of the extreme point whose coordinates of the first parameter axis are closest to the designated coordinates are specified as the search points, and the searched extreme points A waveform display method for specifying a point on the designated coordinate in the measured waveform as the search point when the coordinates of the first parameter axis are not included in the reference range .

Images