JP3107890B2 - How to display the waveform display section when displaying the waveform on the waveform recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for displaying a waveform display portion when a waveform recorder displays a waveform in an enlarged manner. Occupies a portion of the entire waveform with respect to the entire waveform together with the enlarged waveform on a screen.

[0002]

2. Description of the Related Art Generally, when an input signal to be measured is fetched by a waveform recorder and the input waveform is displayed on a screen such as a CRT for observation, it is generally possible to perform detailed observation. A function of enlarging a display capable of enlarging the waveform with a predetermined magnification in the amplitude direction and the time axis direction is provided.

[0003]

FIG. 5 shows an example of a screen display when the input waveform is enlarged in the amplitude direction by, for example, a display magnification of 2, whereas FIG. 6 and FIG. A waveform diagram on the screen when the same input waveform of magnification 2 is scrolled in different directions is illustrated.

In the case of the display example shown in FIG. 5, since the PP value is displayed even when the display magnification is 2 times, the enlarged waveform can be grasped. It is not immediately possible to determine which part.

This is particularly noticeable when the enlarged waveform is scrolled as shown in FIGS. 6 and 7 or when the display magnification is increased, and the operation may be hindered.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and has a structural feature that reads input waveform data stored in a memory and converts the waveform data in the amplitude direction. At the time of enlarged display on a screen such as a CRT at a predetermined magnification along the waveform, a waveform recorder that displays which part of the original waveform in the amplitude direction occupies the enlarged waveform displayed on the screen. In the display method of the waveform display portion in the above, a bar graph-shaped outer frame having a length corresponding to the original waveform display with a display magnification of 1 is displayed at a predetermined portion of the screen, and the current frame is displayed in the outer frame. An inner frame indicating the display position of the displayed enlarged waveform with respect to the original waveform is displayed with a length of 1 / N of the display magnification N.

In the present invention, the display position of the inner frame is fixed, and when the enlarged waveform is scrolled,
Accordingly, the outer frame side is moved .

According to the above configuration, the outer frame corresponds to the screen area when the display magnification is 1, and the inner frame corresponds to the screen area at the display magnification N in the screen with the display magnification 1. The display position of the enlarged waveform with respect to the original waveform can be easily grasped. Also, when scrolling through the enlarged waveform
Moves the outer frame side so that the screen and
The moving direction of the outer frame is the same, resulting in operational discomfort
I do not.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. FIG. 1 is a schematic block diagram of a waveform recorder used in the embodiment.

According to this, the waveform recorder has an input section 1 including an A / D converter for converting an analog input signal into a digital signal.

The sampling frequency and the like of the input unit 1 are controlled by a central processing unit (CPU) 2, and digitally converted waveform data is stored in a random access memory (RAM) according to a write address from the CPU 2.
3 as needed.

A control program required for the CPU 2 is written in a read only memory (ROM)
The PU 2 reads the waveform data from the RAM 3 in accordance with an instruction from the operation unit 5, performs predetermined arithmetic processing, and supplies the waveform data to the recording unit 6 and / or the display unit 7 such as a printer. In this case, the display unit 7 has a display screen including a CRT, an LCD, and the like.

When an instruction for enlarged display in the amplitude direction is issued from the operation unit 5, the CPU 2 performs predetermined arithmetic processing and displays the enlarged waveform on the screen in the same manner as shown in FIGS. According to the present invention, the level monitor 10 showing the relationship between the original waveform and its enlarged waveform as illustrated in FIG. 2 is displayed on a part of the screen according to the present invention.

The level monitor 10 has an outer frame 10a displayed in a bar graph and an inner frame 10b displayed in the outer frame 10a. In this embodiment, the inner frame 10
The inside of b is painted black.

The outer frame 10a has a length corresponding to a screen area along the amplitude direction when the display magnification is 1.
On the other hand, the inner frame 10b shows a display portion of the currently displayed enlarged waveform with respect to the original waveform, and its length is 1 when the display magnification at that time is N and the length of the outer frame 10a is 1. / N.

That is, on a screen where the size of the display area is fixed, enlarging the waveform by the display magnification N means that the 1 / N portion of the original waveform is multiplied by N and expanded over the entire screen. Nothing else.

Next, the operation of this embodiment will be described with reference to the level monitor 10 of FIG. 2 and the flowcharts of FIGS. In the level monitor shown in FIG. 2, FIG. 5A is a display example of the level monitor displayed corresponding to the enlarged display of FIG. 5, and similarly, FIG. FIG. 7C is a display example of the level monitor displayed in response to the scrolling of FIG.

According to the flowchart of FIG. 3, first, waveform data obtained by digitally converting an input signal from the input unit 1 is taken into the RAM 3.

Next, the waveform display magnification is set with a variable ZOOM. In the case of this embodiment, the display magnification is 2
Since it is twice, ZOOM = 2 is set.

The waveform display position is set by a variable called POSI. This waveform display position is the 0V position of the waveform. In this example, the variable POSI is set as a% value with the lower end position of the screen being 0%, the center position being 50%, and the upper end of the screen being 100%. ing.

Then, based on the above variables ZOOM and POSI, an enlarged waveform with a display magnification of 2 is displayed on the screen.
In this case, if POSI = 50% is set, as shown in FIG. 5, the enlarged waveform is developed on the screen with the 0V position at the center position of the screen, and similarly, POSI = 30%
Then, as shown in FIG. 6, the 0V position is set to the 30% position, and P
If OSI = 70%, the 0V position is 70% as shown in FIG.
The enlarged waveforms are respectively developed by setting the positions.

Thereafter, a scroll bar display program indicating the display position of the level monitor 10 is executed based on the variables ZOOM and POSI in accordance with the flowchart shown in FIG.

First, variables X, Y and V are initially set.
V is set. In this case, X is the display position in the time axis direction of the level monitor, and Y is the display position in the amplitude direction. By setting these, the display start position on the screen of the level monitor, that is, the starting point of the level monitor display on the screen VRAM Address VV = VRAM [Y] [X] is determined.

Next, the variables C, W, POS, top,
up, low and bot are set. Explaining each variable with reference to FIG. 2A, first, C is the center of the display area of this level monitor, and when the number of loops for scanning the area is j, it is obtained by VV + j / 2. Next, the variable W is the length of the inner frame 10b and is obtained from W = ZOOM. For example, if ZOOM = 2 (display magnification 2),
This variable W is set to 1/2 of the length of the outer frame 10a.

POS is a variable indicating the 0V position of the inner frame 10a, and is set by the above-mentioned variable POSI. In this embodiment, the variable POS is also the center position of the outer frame 10b.

The variable top is the upper end address of the outer frame 10a, which is obtained from the above variables VV and POS.

The variable up is the upper end address of the inner frame 10b.
This is obtained from the variables C and W described above. low is inner frame 10
The lower end address of b, which is also obtained from the variables C and W.

The variable "bot" is the lower end address of the outer frame 10a, which is obtained from the above variables VV and POS.

When each variable is set as described above,
The next program is executed j times for the variable VV.
In the following description, 00H means display blank, 0FFH means minus line drawing, and 081H means two points... (Dots) display for frame-out.

First, VV and top are compared, and VV>
At the time of top, the display position of the variable VV is set to blank, the address of the variable VV is set to +1 and j = j-1, and the variable VV and top are compared again.

When VV = top, a line serving as the upper end of the outer frame 10a is drawn at the position of the variable, and
+1 and j = j−1.

In such a repetition, when the variable VV is at a position between top and up, 2
A dot dot is displayed.

Thereafter, when the variable VV reaches a position between up and low, a line is drawn during that time, and the inside of the inner frame 10b is displayed in black.

Subsequently, the address of the variable VV is counted up, and when the variable VV reaches between low and bottom, a two-dot dot in a frame is displayed.

When VV = bot, a line serving as the lower end of the outer frame 10a is drawn at the position of the variable, and when VV <bot, the display below it is blank.

As described above, the level monitor shown in FIG. 2 is displayed on a predetermined portion of the screen. Figure (A)
5 shows a level monitor displayed on the screen together with the enlarged waveform of FIG. 5, whereby it is easy to grasp that the currently displayed enlarged waveform of the magnification 2 is almost at the center of the original waveform. be able to.

On the other hand, FIG. 6B shows a level monitor when the 0V position of the enlarged waveform of FIG. 5 is scrolled to a 30% position on the screen as shown in FIG. 7) shows a level monitor when the 0V position of the enlarged waveform in FIG. 5 is scrolled to a 70% position on the screen as shown in FIG. 7, and in each case, which part of the original waveform is the enlarged waveform. It can be clearly distinguished.

In the case of scrolling the waveform, for example, when the waveform is scrolled upward by changing the 0 V position from the 30% position to 70% on the screen, in this embodiment, the outer frame 10a is shown in FIG. From (C) upward, the moving direction of the 0V position and the moving direction of the outer frame 10a which is a scroll bar are the same direction.
There is no discomfort in operation.

[0039]

As described above, according to the present invention, it is possible to easily grasp which portion of the original waveform corresponds to the currently displayed enlarged waveform, enlarge the waveform, and It is very convenient for observing details in detail. When scrolling the enlarged waveform,
By moving the outer frame side, the screen and outer frame
Movement direction is the same, which causes operational discomfort
Not even.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing an embodiment of a waveform recorder used in the present invention.

FIG. 2 is an explanatory diagram of a level monitor displayed on a screen according to the present invention.

FIG. 3 is a schematic flowchart for explaining the operation of the present invention.

FIG. 4 is a specific flowchart for displaying a level monitor.

FIG. 5 is a diagram showing a display magnification of 2 × and a 0V position on a screen of 50 times.
FIG. 9 is a waveform chart showing an example of an enlarged waveform when the position is a% position.

FIG. 6 is a waveform diagram when the enlarged waveform of FIG. 5 is scrolled so that its 0V position becomes a 30% position.

FIG. 7 is a waveform diagram when the enlarged waveform of FIG. 5 is scrolled so that its 0V position becomes a 70% position.

[Description of Signs] 1 input unit 2 CPU 3 RAM 4 ROM 5 operation unit 6 recording unit 7 display unit 10 level monitor 10a outer frame 10b inner frame

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01R 13/00-13/42 G09G 5/36 520

Claims (1)

(57) [Claims] When reading input waveform data stored in a memory and enlarging the waveform data on a screen of a CRT or the like at a predetermined magnification along its amplitude direction, the enlarged data displayed on the screen is displayed. In a method for displaying a waveform display portion at the time of enlarged waveform display of a waveform recorder for displaying which portion of an original waveform the waveform occupies in an amplitude direction, an original waveform display with a display magnification of 1 times is displayed at a predetermined portion of the screen. Sometimes, a bar graph-shaped outer frame having a corresponding length is displayed, and an inner frame indicating the display position of the enlarged waveform currently displayed in the outer frame with respect to the original waveform is 1 / N of the display magnification N. And the display position of the above inner frame
When scrolling the enlarged waveform above,
A method of displaying a waveform display portion when a waveform recorder displays a waveform in an enlarged manner, wherein the outer frame side is moved in accordance with the above .