JPH07120502A - Waveform display device - Google Patents

Abstract

PURPOSE:To provide a waveform display device which can read out a cursor with respect to a magnified part with time axis resolution following its magnification at the time of split display. CONSTITUTION:The waveform display device is characterized by having an input data memory 1, a display setting means 6 for setting which part of a waveform is no be magnified and displayed, two data compressing means 2,3, a waveform display processing means 4 for accepting the data to process it for waveform display based on setting from the display setting means 6, a read-out display processing means 5 for accepting the data from the two data compressing means 2,3 to process the data for displaying read-out values based on the setting from the display setting means 6 and a display 7 for displaying signals from the waveform display processing means 4 and the read-out display processing means 5 on a display screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display data read-out device suitable for reading out the value of a waveform displayed on a waveform display device or the like.

[0002]

2. Description of the Related Art Conventionally, in a waveform display device such as a digital oscilloscope, it is sometimes desired to display a waveform on the basis of a certain data group and further display a part of the display in detail along the time axis. . In such a case, the display screen is divided as shown in FIG. 2, the basic waveform is displayed on the upper screen, and the waveform of the specified section is displayed on the lower axis as the time axis. Along with this, observation is performed by displaying using a method called split display such as enlarging and displaying.

Further, a more detailed observation can be performed by using a so-called cursor readout method in which the voltage value of the cursor portion which is superimposed and displayed on the waveform displayed in this state is displayed by a numeral.

Regarding this cursor readout, the conventional waveform display device only displays the data displayed at a predetermined magnification.

[0005]

Therefore, even if a portion of the time of the waveform is enlarged and displayed as in the split-angle display, the lead-out display of the enlarged portion is not displayed in the conventional waveform display. On the device, it will be read in the same time width as before enlargement, and even if the waveform is enlarged and displayed, there is a problem that it is not possible to read out minute changes depending on the cursor readout method. Occur. An object of the present invention is to solve such a problem, and when a split display is performed, a waveform display for performing cursor readout with a time resolution that follows the enlargement ratio of the portion where the waveform is enlarged and displayed. The purpose is to provide a device.

[0006]

SUMMARY OF THE INVENTION The present invention sets an input data memory for storing data obtained by digitizing an input signal, a split display, and which part of a waveform is enlarged and displayed. Display setting means, first data compressing means for performing a data compression operation on the data from the input data memory based on a certain setting, and data from the input data memory based on a signal from the display setting means. A second data compression unit for performing data compression operation, and data input from the first data compression unit and the second data compression unit are input, and a waveform is displayed based on the setting from the display setting unit. The waveform display processing means for performing the processing of (1) and the data from the first data compression means and the second data compression means are input, and based on the setting from the display setting means. A lead-out display processing means for performing processing for displaying the lead-out value; and a display for displaying signals from the waveform display processing means and the lead-out display processing means on a display screen. It is a waveform display device.

[0007]

When the split display is performed, the cursor read is performed using the enlarged and displayed data, so the readout of the enlarged waveform portion is performed following the enlargement ratio. .

[0008]

FIG. 1 is a block diagram of an embodiment according to the present invention. In the figure, reference numeral 1 denotes an input data memory in which an analog input signal digitized is stored. Data compression means 2 and 3 are for compressing the data from the input data memory 1. This compression processing will be described later in detail. Briefly, the data compression means 2 performs an operation related to the data compression rate in the normal display, and the data compression means 3 performs an operation related to the data compression depending on the enlargement rate related to the split display.

Reference numeral 4 denotes a waveform display processing means, which performs data processing for displaying a waveform based on the data from the data compression means 2 and 3. Reference numeral 5 is a lead-out display processing means for performing data processing for lead-out display of the displayed waveform based on the data from the data compression means 2, 3. 6 is a display setting means for setting the screen display to split display,
In addition, in the split display, which portion of the waveform before being enlarged is displayed and at what enlargement ratio are set.

Reference numeral 7 denotes a display, which receives display signals from the waveform display processing means 4 and the lead-out display processing means 5 to perform waveform display and lead-out display on the screen.

The operation of such a configuration will be described with reference to FIGS. 2 and 3 are both split display screens according to the configuration of the present invention. In both figures, the upper part of the split screen is the normal display waveform (hereinafter referred to as "main waveform"), and the lower part is a waveform enlarged based on the main waveform (hereinafter "zoom"). Called "waveform")
It represents.

A solid rectangular frame on the screen for the main waveform (hereinafter referred to as "zoom box")
Is for setting the portion to be enlarged and displayed by the zoom waveform. Depending on the position and size of this zoom box,
The zoom target position indicating which part of the main waveform is zoomed and the enlargement ratio (so-called zoom ratio) indicating how much the main waveform is expanded are understood.

The rough and fine dashed lines indicate cursors. The values read by this cursor are displayed as V1 and V2 outside the waveform display area.

First, in a normal waveform display device, when displaying data on one raster, a plurality of data are arithmetically processed by the data compressing means 2 to obtain the maximum value minimum value or average value of these data. This compressed data is derived and displayed as shown in the upper row of FIGS.

This will be specifically described. For example, a waveform display device such as a digital oscilloscope can sample data at a maximum of 100K points for each channel. In this way, a maximum of 100,000 pieces of data are collected to display one screen. At this time, since the resolution of the horizontal axis of the display is 500 (500 rasters) in terms of the resolution of the accuracy of the display device 7, it is necessary to perform data compression processing at a maximum of 1/200 and display.

Therefore, in displaying the data for one raster, the analog input signal is digitized 200
The data for points is used, and the maximum / minimum value among them is the point of the raster. The 100,000 pieces of data are stored in the input data memory 1, and the 1/200 data compression processing is performed by the data processing means 2.

On the other hand, at this time, a portion corresponding to 1/10 of the main waveform is displayed as a zoom waveform. At this time, information about which part of the waveform is to be enlarged and how to enlarge the position is given from the position of the zoom box. This corresponds to the operation of the display setting means 6 shown in FIG.

Based on the information from the display setting means 6, the data compression means 3 compresses the corresponding data in the input data memory to 1/20 (= {(1/200) / (1/10)}). To process.

In the waveform display means 4, the data compressed to 1/200 is input from the data compression means 4 and displayed as the main waveform in the upper stage of FIGS. 2 and 3, and the data compressed to 1/20 is displayed. It is input from the data compression means 5 and displayed as a zoom waveform in the lower stage of FIGS. 2 and 3.

At the same time, these values from the data compression means 2 and 3 are input to the lead-out display processing means 5, and the portion displayed as a zoom waveform by the information from the display setting means 6 is the data compression means. The lead-out value is displayed on the basis of the data input from 3 and the other portions display the lead-out value on the basis of the data for the main waveform input from the data compression means 2.

More specifically, as shown in FIG.
When the cursor is on the main waveform portion, the lead-out value is displayed on the V1 and V2 portions based on the data from the data compression means 2. The readout value at this time becomes equivalent to the resolution at which the main waveform is displayed, and the readout value is updated every time the raster of the main waveform is displayed.

By moving the cursor as shown in FIG. 3, when the cursor enters the zoom box, the V1 and V2 portions are read based on the data from the data compression means 3 for displaying the zoom waveform. Out value is displayed. The lead-out value at this time becomes equal to the resolution for displaying the zoom waveform, and the lead-out value is updated every time the raster of the zoom waveform is displayed.

The portion displayed as the zoom waveform has 10 times the display data for the portion in the same time range of the main waveform (the portion of the zoom box), so the portion displayed in the enlarged form is , The data can also be displayed finely on the time axis.

[0024]

As described above, according to the present invention, it is possible to read out the cursor in the enlarged portion in the split display with the time axis resolution following the enlargement ratio.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an operation of the present invention using a display screen.

FIG. 3 is an explanatory diagram of an operation of the present invention using a display screen.

[Explanation of symbols]

 1 Input data memory 2, 3 Data compression means 4 Waveform display processing means 5 Lead-out display processing means 6 Display

Claims (1)

[Claims] 1. An input data memory for storing data obtained by digitizing an input signal, display setting means for setting a split display and setting which portion of a waveform is enlarged and displayed, said input data. A first data compression means for performing a data compression operation on the data from the memory based on a certain setting, and a second data compression operation for performing the data compression operation on the data from the input data memory based on a signal from the display setting means. Waveform display processing means for inputting data from the data compression means and the first data compression means and the second data compression means, and performing processing for displaying a waveform based on the setting from the display setting means. And input the data from the first data compression means and the second data compression means, and display the lead-out value based on the setting from the display setting means. Waveform display device, wherein the processing and the lead-out display processing means for, that was provided, and a display device for performing display signals from the waveform display processing means and the read-out display processing means on the display screen for causing.