JPS62161193A - Waveform display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a waveform display device, and more specifically, it temporarily stores measured waveform data in a memory and displays it on a screen, and also displays a portion of desired waveform data. The present invention relates to a waveform display device that enlarges and displays an image while scrolling it left and right.

[Technical Background of the Invention] When observing the waveform of a signal under test by recording it on a recorder or displaying it on an image display, for example, the rising or falling portion of the waveform, or the waveform such as a transient phenomenon. about,
It is often necessary to enlarge and display a particular area for detailed analysis.

In such cases, the digital conversion data of the signal under test is generally stored in a memory, for example, and the data is scrolled left and right on the display screen while enlarging the waveform at the desired location. A conventional example is shown in FIG.

Figure (A) shows the case where the waveform data stored in the memory is displayed on the entire display screen 1, and the desired enlarged section [When A and Bl are specified, the displayed waveform W] is displayed. For example, a bright spot P that blinks.

P' appears. Next, when the specified section [A, Bl is enlarged and displayed, a waveform EV as shown in FIG. However, in this case, since the original entire waveform W disappears, it becomes difficult to compare which part has been enlarged and displayed. The same figure (c) shows the original overall waveform W and bright points P, P.
' and an enlarged waveform EV are displayed, and although it is easy to compare the waveforms with each other, the scrolling means becomes complicated. Furthermore, since the screen that can be used to enlarge the waveform is halved, it is necessary to compress the waveform data stored in the memory to, for example, 1/2, which is undesirable as it reduces accuracy.

[Object of the Invention] This invention has been made in view of the above points, and [1] the enlarged waveform is displayed using the entire screen, and
An object of the present invention is to realize a highly accurate waveform display device in which a cursor is also displayed at the same time so that the section of an enlarged waveform can be easily seen with respect to the entire original waveform.

[Example] Hereinafter, the present invention will be explained in detail with reference to the example shown in the accompanying drawings.

First, the displayed waveform obtained by this waveform display device will be explained with reference to FIG. An example is shown. In this embodiment, a transparent plastic plate 2 of approximately the same size as the display screen 1 is attached to the display screen 1, and a scale line 3 is provided at the lower end of the plate to divide the width of the display screen 1 into ten equal parts. It is being The scale lines 3 are not limited to 10 equally divided scale lines, but may be set at appropriate intervals so as not to be too fine and difficult to see.Also, the scale lines 3 may be electrically displayed on the screen 1. good.

When the enlarged display section [A, Bl] is specified for a desired location in the overall display waveform W, as in the conventional example, a blinking cursor 4 appears at the corresponding position on the scale line 3, for example. When this specified section [A, Bl is displayed in an enlarged manner, an enlarged waveform EV1 of that portion appears as shown in FIG. For example, if you scroll rightward toward the screen 1, an enlarged waveform EV of the same width appears as shown in (c). The figure (d) shows the enlarged section [A,
This is an example in which Bl is slightly expanded, and a cursor 5 with a corresponding width and its enlarged waveform EW3 are displayed.

As can be seen from these display examples, by comparing the scale line 3, which replaces the entire waveform W, with the cursor 4 or 5, it is possible to easily know which part is being displayed in an enlarged manner.

Next, the memory provided in this device for performing the above-mentioned display will be explained with reference to FIG. 2. On the input side of the signal to be measured, for example, A/D conversion means 6 for converting this input signal into digital is provided. A storage means 7 is provided downstream of the A/D conversion means 6 for storing the digitally converted data of the above-mentioned Jinkai-d.

The data held by this storage means 7 is, for example, the switching means S
1 to the entire waveform data creation means 8 or enlarged waveform data creation means 9, and the entire waveform data creation means 8 displays, for example, the entire waveform W of the signal under test shown in FIG. 1(a) above. Data for this purpose is created. Further, in the enlarged waveform data creation means 9, for example, the first
Data for displaying the enlarged waveforms EV to EV shown in FIGS. They are applied to the waveform display means 11 through the switching means S2 which is switched in conjunction with the switching means S1, so that the entire waveform W or the enlarged waveform EW or EV is displayed. .

In this embodiment, the enlarged waveform EW1 on the screen 1 is
Cursor 4 or 5 is also displayed to indicate which section of the entire waveform W is EW to EW. Therefore, for example, when cursor 4 is raised,
A display section width indicating means 12 is provided for setting the display section width.

The section of the cursor 5 is similarly set by the display section width indicating means 12.

Also, the above enlarged waveform EW, EV, etc. can be converted to the entire waveform W.
A scroll instructing means 13 is provided to scroll the screen to the right or left from an arbitrary position in the screen, and each output of the scroll instructing means 13 and the display section width instructing means 12 is used as a cursor data creating means, for example. 14
can be added to.

This cursor data creation means 14 creates display section width data of the cursor 4 or 5 and its scroll start position data.

This data is used together with the display data of the overall waveform W created in the overall waveform data creation means 8 by the switching means S2.
When the entire waveform W is displayed, it is simultaneously displayed as a cursor at a corresponding position on the scale line 3.

In this case, the cursor display section width data and position data created by the cursor data creation means 14 are as follows:
Another cursor data creation means 15 is also manually operated. In this cursor data creation means 15, for example, the width and position of the cursor 4 when displaying the waveform data in an enlarged manner is so that the width and position thereof are displayed as they are when the entire waveform is displayed. , cursor data is converted in accordance with the enlargement magnification of the enlarged waveform. The output data from the cursor data generating means 15 is sent to the waveform display means 11 in the same manner as in the case of displaying the entire waveform, and is displayed as a cursor at the corresponding position of the scale line 3 at the same time when displaying the enlarged waveform.

Next, the circuit configuration of this device will be explained with reference to FIG. In FIG. 3, units having the functions shown in FIG. 2 are indicated by the same reference numerals in parentheses.

Hereinafter, this device will be described as the input section 16 and data creation section 17 for convenience.
, and the display section 18 having the display screen 1 shown in FIG. 1 above.
For example, the A/D converter 19 and the bipolar switch 20
, a digital switch 21, an encoder 22, etc.

The data creation section 17 includes, for example, an I10 port 23 for input, a CPU 24, a memory 25, an I10 port 26 for output, and the like.

The A/D converter 19 in the input section 16 converts the signal under test input from the terminal 27 into, for example, an 8-bit digital signal, and sends the signal to the CPU via the I10 port 23.
It is designed to be sent to 24. In the switch 20, for example, an H level voltage is applied to one switching contact A, and the other switching contact, point B, is grounded. In this embodiment, the movable piece is connected to the switching contact A, as shown by the solid line in the figure.
and the common contact C, an H level voltage is applied to the CPU 24 via the I10 port 23,
The CPU 24 reads, for example, all waveform data from the memory 25 and sends it to the display section 18. Therefore, the entire waveform W of the signal under test is displayed on the display section 18. When the movable piece is connected to the switching contact B and the common contact C as shown by the dotted line, the CPU 24 reads out the waveform data within the designated section [A, Bl] from the memory 25 and displays it on the display section 18. Sending, display section 18
The enlarged waveforms EV1 to EW, etc. are displayed.

When displaying an enlarged waveform on the display section 18, the digital switch 21 selects, for example, the display section [A.

Bl is designated, and the encoder 22 is used to designate the start address of enlarged display. That is, as shown in FIG.
, Bl correspond to addresses m to m+α, then the number of addresses within this section is α+1.

The digital switch 21 specifies, for example, the number of addresses α+1 within this section, and the encoder 22 specifies, for example, the start address m of enlarged display. The outputs from the digital switch 21 and the encoder 22 are decoded by the CPU 24, and the waveform data at the designated addresses are sequentially read out from the memory 25, and cursor data is also created and sequentially sent to the display section 18 to display the enlarged waveform and its sections. A corresponding cursor will be displayed. In this case, when the encoder 22 is rotated, for example, to the right, the start address of the enlarged display changes, and although the display width of the cursor does not change, its position moves left and right on the scale line 3, and the displayed waveform follows, for example. It changes from (b) to (c) in Figure 1.

Here, to provide a supplementary explanation of how the waveforms are displayed on the display section 18, the display screen 1 used in the display section 18 has, for example, 128 x 128 waveforms in the horizontal direction to represent time and the vertical direction to represent the level. Dot-shaped liquid crystal cells are arranged in a matrix. However, the number of addresses (n+1) of the entire data memory is far greater than the number of liquid crystal cells.

Memory data at one address cannot be input and displayed in one cell in the horizontal direction. Therefore, in this embodiment, as shown in FIG.
．．・・・・・・Divided equally into 128 sections such as section 127, and each section has △=(n +1)/12
It is set to include 8 data memories.

For display screen 1, for example, the first column of cells on the left side is column number 0, the one column to the right is column number 1, and the next cell is column number 2.
．． ...and so on, the first column on the right is column number 127.
In the case of displaying the entire waveform, enter (n+1) 7128 pieces of memory data from section 0 into the cell column number O, and do the same for each corresponding section up to cell column number 127. Input the memory data in order.

In the case of enlarged waveform display, for example, the memory data from the section P containing the above address m to the section q containing the address m+α is divided into 128 equal parts, and each equally divided memory data is divided into 128 equal parts. Manually input to cell row number 127 in sequence.

In this case, the cell column number and the partition number of the data memory no longer correspond, but there is no particular problem.

An example of the case where the above display operation is controlled by, for example, a microcomputer is shown in a flow diagram in FIG.

[Effects of the Invention] As explained above in detail, the waveform display device according to the present invention displays the entire waveform obtained from all the waveform data of the signal under test stored in the memory and the specified waveform data from the entire waveform data. The enlarged waveform of a portion of the data is displayed on the display screen, and the display screen also has scale lines representing the range of all the waveform data as desired. When the range of the waveform data for enlarged display is specified, the address range of the memory to which the data belongs is displayed with a cursor on the scale line.

Therefore, by visually observing the position of the cursor with respect to the scale line, it can be easily determined which part of the entire waveform the enlarged waveform is. Therefore, it is possible to display an enlarged waveform using the entire screen, and highly accurate waveform analysis can be performed.

[Brief explanation of drawings]

1 to 6 all relate to embodiments of the waveform display device according to the present invention, in which FIG. 1 is an explanatory diagram of displayed waveforms, FIG. 2 is a functional block diagram, and FIG. 3 is a circuit configuration block diagram. , FIG. 4 and FIG. 5 are explanatory diagrams of the data memory, FIG. 6 is a flowchart, and FIG. 7 is an explanatory diagram of display waveforms in a conventional device. In the figure, 1 is the display screen, 3 is the scale line, 4 and 5 are the cursors,
17 is a data creation section, 18 is a display section, 19 is an A/D converter, 20 is a switch, 21 is a digital switch,
22 is an encoder, 24 is a CPU, and 25 is a memory.

Claims (1)

[Scope of Claims] A memory for storing waveform data obtained by digitally converting the signal under test, and a display screen in which display elements are arranged in a matrix of i rows and j columns, the entire waveform of the signal under test being and an enlarged waveform obtained by enlarging a part of the waveform specified with respect to the entire waveform by the display range specifying means. The total address of the memory is set to N, and when the above-mentioned entire waveform is displayed, the above-mentioned memory is divided into N/j groups and the waveform data of each group is assigned to each corresponding column of the above-mentioned display screen, and when the above-mentioned enlarged waveform is displayed, the above-mentioned The number of addresses in a predetermined group specified by the display range specifying means is further divided into j and each waveform data is assigned to a corresponding column on the display screen, and when displaying an enlarged waveform, the read data range is 1. A waveform display device characterized in that a cursor is displayed.