JPH11142440A - Waveform display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waveform display that displays the minimum/maximum value data of a plurality of channels simultaneously such that the minimum or maximum value data are changed round simultaneously. SOLUTION: The waveform display comprises a display processing circuit 4 for producing the display waveforms of all channels on the basis of the minimum/maximum value data created by a minimum/maximum value creating circuit 2, a first display means 5a to display the waveforms outputted from the display processing circuit 4, a vertical-cursor creating means to create a vertical cursor adapted to move to the left and right on the screen of the first display means 5a, a cursor moving means to move the cursor, a memory 31 for storing the minimum/maximum value data of all channels created by the minimum/maximum value creating circuit 2, and a second display means 32 to read the minimum or maximum value data of all channels at the points where the vertical cursor intersects the waveforms out of the memory 31 and display these data thus read out in symbols and values. In this configuration, moving the vertical cursor simultaneously changes the waveform display of all channels and the minimum or maximum values for an arbitrary period stored in the memory 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform display device, and more particularly to an improvement in a display method on a graphic display when real-time recording and memory sampling are performed in parallel.

[0002]

2. Description of the Related Art Conventionally, a waveform measuring instrument having a function of recording and displaying a measured waveform and storing measured waveform data in a waveform memory in parallel with the waveform is well known as, for example, an oscillographic recorder. I have.

FIG. 7 shows a configuration diagram of a main part of this type of waveform display device. An analog input signal is converted to a digital signal by an analog-to-digital converter (hereinafter, referred to as an AD converter) 1.
It is input to the maximum value creation circuit 2 and the measured value storage memory 3 respectively. However, the timing of taking in the data into the minimum / maximum value creation circuit 2 and the memory 3 can be set arbitrarily, and the AD conversion value can be decimated as appropriate and taken into the minimum / maximum value creation circuit 2 and the memory 3. It has become.

In the minimum / maximum value generating circuit 2, the data of the first two points taken in is calculated as the minimum-maximum value (hereinafter referred to as "maximum value").
min-max value), and from the third and subsequent data, the min-max value is sequentially updated while comparing with the min-max value. The min-max value obtained in this way is displayed on the display screen in a form interpolated by the display dots between each min-max as shown in FIG.

A more detailed operation will be described in order as follows. As shown in FIG. 9, (1) The AD value is measured, and the AD converted value is stored in the memory 3 at the timing of storing in the memory 3. If it is not the timing to store the data in the memory 3, the process proceeds to the next step without taking in the AD conversion value.

(2) The min-max value generating circuit 2 fetches the AD value into its internal memory (not shown) and newly generates the min-max value.
Find (update) the value. The updated value is processed by the display processing circuit 4 (the middle of the min-max value is interpolated with a straight line)
(Liquid Crystal Display) Stored in the display memory (bitmap memory: not shown) for the display 5. (3) If it is time to update the display on the LCD screen, the contents of the display memory are displayed. (4) The min-max value creation circuit 2 initializes the contents of its internal memory.

[0007] The waveform measured by repeating the above operation is represented by LC
It is displayed on the D display 5. In the case of an input of a plurality of channels, AD conversion is performed simultaneously on all the channels in parallel, and thereafter, a min-max value is created for each channel and a measured value is stored in a memory. Further, control necessary for each of the above sections is performed by a control circuit (not shown).

[0008]

In this type of waveform measuring instrument, for example, as shown in FIG.
The horizontal axis may be displayed as time. In the figure, line segments a to d are input signals of ch1 to ch4, and a vertical cursor 10 and a horizontal cursor 11 are displayed on this screen. In this case, the operator moves the horizontal cursor 11 to the position of a desired channel and moves the vertical cursor 10 in the left-right direction to read the voltage at that point.

Further, the conventional apparatus is provided with a min-max value display means 12 for displaying the maximum value or the minimum value of the voltage at the point of one channel (channel 1 is shown in the figure) at the same time. The display of the maximum value and the maximum value are switched by the switch 13. However, in such a conventional example, when reading the voltage value,
The vertical cursor 10 and the horizontal cursor 11 must be displayed and their intersection points must be adjusted to the waveform. To read the min-max value of the desired channel, the horizontal cursor 11 must be moved up and down. . That is, it takes time and effort to read one maximum value and one minimum value, and there is a problem that data comparison between channels cannot be easily performed because each display is performed one by one.

That is, conventionally, for example, as shown in FIG. 11, cursor selection processing is performed by cursor selection command means, channel designation processing is performed by channel selection command means, and cursor movement processing is performed by cursor movement command means. The display process is performed while the voltage character string creation process is performed together with the display process.

In view of the above, an object of the present invention is to provide
An object of the present invention is to provide a waveform display device which simultaneously displays min-max value data of a plurality of channels and simultaneously switches the min-max values of these data.

[0012]

In order to achieve the above object, according to the present invention, digitally converted waveform data of a plurality of channels is received, and the minimum and maximum values for each sampling time are stored for each channel. A minimum / maximum value creating circuit, a display processing circuit that generates display waveforms for all channels based on the minimum / maximum value data created by the minimum / maximum value creating circuit, and an output of the display processing circuit. First display means for displaying a waveform on the basis of the waveform, vertical cursor generation means for generating a cursor for moving the cursor horizontally on the screen of the first display means, movement means for the cursor, and the minimum / maximum value creation circuit A memory for storing the data of the minimum and maximum values of all the channels created in step (a), and a minimum or maximum value of all the channels at the intersection of the plurality of waveforms and the vertical cursor. A second display means for displaying a screen by the symbol and the numerical reading data values from said memory,
Wherein the minimum value or the maximum value of all channels at any time stored in the memory can be simultaneously switched by moving the cursor.

[0013]

The data created by the min-max value creation circuit is stored in the memory and also applied to the display processing circuit. The vertical cursor generating means generates a linear cursor moving on the screen of the first display means in the left-right direction. The second display processing means reads, from the memory, the data of the minimum value or the maximum value of all the channels at the intersections of the plurality of waveforms and the vertical cursor, and displays the screen on the second display means using symbols and numerical values.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration diagram showing one embodiment of a waveform measuring instrument according to the present invention. In FIG. 1, the same parts as those in FIG. 7 described in the conventional example are denoted by the same reference numerals, and the description of those parts will be omitted. In FIG. 1, the point different from FIG. 7 is that the conventional display is shown as a first display 5a, the cursor is only a vertical cursor (described later), and the minimum and maximum values of the cursor positions of all displayed waveforms are set. Second display means 32 for displaying
It is a part consisting of

The memory 31 stores raw data (raw waveform data) from the AD converter 1 and min-m data from the min-max value generating circuit 2.
Stores ax value data. The second display means receives and displays the min-max values of all the channels stored in the memory 31.
In addition, the display processing circuit 4 performs mi
Perform processing for displaying n-max data.

The operation in such a configuration will be described next with reference to the flow of FIG. (1) The input signals of a plurality of channels are AD-converted in parallel and simultaneously by a plurality of AD converters. AD conversion value data
It is input to the min-max value creation circuit 2 and the memory 31.

(2) The min-max value is updated based on the AD conversion value (measured value) newly taken in by the min-max value creation circuit 2. (3) If it is time to store the min-max value in the memory 31, the process proceeds to the next step (4). If it is not the storage timing, proceed to the step (8).

(4) The updated min-max value is stored in the memory 31. Note that AD conversion data (so-called raw data) is also stored in the memory 31. (5) Repeat steps (2) to (4) for all channels.

(6) When the above process is completed for all channels, a waveform updating process is performed. (7) After the waveform update processing, the min-max
Initialize the value. (8) Return to (1) above. In the present invention, the min-max value at the intersection of the cursor and the waveform when the vertical cursor is moved in the left-right direction is displayed over all channels, and the display of the min-max value is switched by a switch.

Such an operation is performed according to the flow shown in FIG. That is, after the start, the first display device 5a (FIG. 1)
) Displays a vertical cursor and performs character string display processing.
Next, it is determined whether there is a cursor movement or a min-max value switching command. If there is an instruction to move the cursor, a character string display process at the position where the cursor has moved is performed.

If there is a min-max value switching command,
The character string display process is performed by switching the mode of the max value. The flow of the character string display processing is as shown in FIG. 4. After the start, a voltage character string corresponding to the mode of the min-max value is created and data display of all channels is performed.

FIG. 5 is a block diagram of the apparatus according to the present invention, in which cursor movement processing is performed by cursor movement instruction means, cursor display processing and voltage character string creation processing are performed, and screen display processing is performed. ing. In the present invention, the min-max value switching processing is performed by the min-max value switching command means, and the min-max values of all the channels are simultaneously displayed. The hatched portions in the figure indicate the operations performed in the conventional example.

FIG. 6 shows a screen of the display device according to the present invention, in which the first display means 5a shows only the vertical cursor 10a and the waveforms of all the channels, and the second display means 32 shows the min. Alternatively, the max value is indicated. 13 is min-
This is a switch for changing the max value.

It is to be noted that the above description of the present invention has been presented by way of illustration and example only of a particular preferred embodiment. Thus, it will be apparent to one skilled in the art that the present invention may be modified or modified in many ways without departing from its essentials.

For example, the memory 31 may be a battery with a battery backup (for example, SRAM) or a hard disk. With such a configuration, the waveform before the momentary stop can be easily reproduced after the momentary stop. Further, the display processing circuit and / or the full-screen rewriting processing circuit may be provided with a function of compressing or expanding the waveform and displaying the waveform. Further, the memory 31 has a sufficient capacity to store display data having a length of one screen or more, and temporarily compresses and displays the waveform in the time axis direction by the above-described compression function. It can also be grasped at the same time.

[0026]

As described above, according to the present invention, the following effects can be obtained. (1) Since a min-max value changeover switch is provided, only one cursor needs to be used, and cursor operation is simplified. (2) Since all waveforms of a plurality of channels are displayed, data between channels can be compared and grasped at a glance. (3) It is possible to display the min-max value of each point without moving the cursor. (4) If the length of one or more display screens is stored in the memory, it is possible to temporarily compress and display the time axis direction of the waveform to grasp past phenomena.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a waveform display device according to the present invention.

FIG. 2 is an operation flow of storing a minimum value and a maximum value in a memory of the waveform display device of the present invention.

FIG. 3 is a processing flow of the present invention.

FIG. 4 is a flowchart of a character string display process.

FIG. 5 is a block diagram of the present invention.

FIG. 6 is a diagram showing a display screen of the present invention.

FIG. 7 is a configuration diagram illustrating an example of a conventional waveform display device.

FIG. 8 is a diagram for explaining a min-max value and a display state thereof.

FIG. 9 is an operation flow in a conventional waveform display device.

FIG. 10 is a diagram showing a conventional waveform and a display mode of a minimum value and a maximum value.

FIG. 11 is a block diagram of a related art.

[Explanation of symbols]

 Reference Signs List 1 AD converter 2 Minimum / maximum value creation circuit 4 Display processing circuit 5a First display means 10a Vertical cursor 13a Changeover switch 31 Memory 32 Second display means

Claims (3)

[Claims] 1. A minimum / maximum value generating circuit for receiving digitally converted waveform data of a plurality of channels and storing a minimum / maximum value for each sampling time for each channel; A display processing circuit for generating display waveforms of all channels based on the minimum / maximum value data created by the circuit, a first display means for displaying a waveform based on an output of the display processing circuit, and the first display means Vertical cursor generating means for generating a cursor that moves in the left-right direction on the screen, moving means for the cursor, and memory for storing the minimum and maximum value data of all the channels created by the minimum and maximum value creation circuit And reading the data of the minimum or maximum value of all the channels at the intersections of the plurality of waveforms and the vertical cursor from the memory, and using symbols and numerical values. And a second display means for performing surface display, wherein the configuration is such that by moving the cursor, it is possible to simultaneously switch the waveform display of all channels stored in the memory and the minimum value or the maximum value at any time. Characteristic waveform display device. 2. The waveform display device according to claim 1, wherein said display processing circuit has a function of compressing and expanding a waveform. 3. The memory has a sufficient capacity to store display data having a length of one screen or more, and the compression function temporarily compresses the waveform in the time axis direction to prevent past phenomena. 3. The waveform display device according to claim 2, wherein the waveform display device is configured to be able to simultaneously display a waveform.