JPH10221378A - Waveform observing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the smooth recognition of changes in waveforms by displaying enlarged waveforms indicating changes in waveforms together at the time of the roll display of reproduced display waveforms. SOLUTION: Approximately 1,000 seconds are required for the roll display of waveforms from one end of a screen to the other end when data length is approximately 1M word and a sampling frequency is approximately 1kHz. As the time-base resolution of a display device 5 is approximately 50-1000 lines, the state of changes in waveforms is not evident. To remedy it, enlarged waveforms for the recognition of changes in waveforms are auxiliarily displayed on the display device 5 together with reproduced wave forms and are erased at the time of the termination of roll display operation so that no contradictions with original settings may occur. This operation is managed and controlled by a CPU 3. By this method, no special settings or operation are necessary and it becomes easy to understand the roll display of waveforms by temporarily and auxiliarily displaying enlarged waveforms.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform observation device, and more particularly to an improvement in a roll display function.

[0002]

2. Description of the Related Art Conventionally, input waveform data sampled and digitally converted at a predetermined cycle is sequentially stored in a memory, and waveform data is read out from the memory as appropriate and reproduced and displayed on a display screen to observe an input waveform. Waveform observing devices configured to perform such operations are well known.

In this type of waveform observation apparatus, there is a roll display for reproducing and displaying a waveform at the same time as taking in data when the sampling frequency is low. The roll display method generally includes the following two methods. A method for displaying a predetermined number of latest data regardless of the data length to be captured. A method in which data is processed and displayed so that the data length to be captured fills the display screen in the time axis direction.

When observing input data as shown in FIG. 4, only a predetermined number of latest data are displayed in a steady state as shown in FIG. 5 in the above display method, and a predetermined number of data as shown in FIG. Is displayed on the entire screen. Which display method is adopted depends on the purpose of the waveform observation. The pros and cons are not discussed here. The present invention is an improvement on a waveform observation device employing the above display method.

[0005]

However, the above-mentioned display system has the following problems. That is,
When the sampling frequency is fixed, the display time becomes longer in proportion to the data length. As a result, there is a problem that the speed at which the waveform flows (roll display in the time axis direction) becomes slow, and a change in the waveform is hardly recognized.

SUMMARY OF THE INVENTION An object of the present invention is to provide a waveform observing apparatus which performs an auxiliary waveform display in which a change in a waveform can be recognized in view of the above points.

[0007]

In order to achieve the above object, according to the present invention, maximum and minimum values are obtained from data obtained by digitally converting an input signal, the data is stored in a storage medium, and the data is read out and displayed on a screen. In the waveform observation apparatus for reproducing and displaying, the roll display of the reproduced display waveform is configured to also display an enlarged waveform representing a change in the waveform.

[0008]

When the actual waveform is roll-displayed, an enlarged waveform representing a change in the waveform is additionally displayed. This makes it possible to easily recognize a change in the waveform even when it is difficult to grasp the change in the waveform due to the slow update of the waveform display in the roll display.

[0009]

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 observation device according to the present invention. In the figure, 1 is an analog-to-digital converter (hereinafter referred to as an AD converter) for digitizing an input signal, 2 is a memory for collecting data, 3 is a central processing processor (hereinafter referred to as a CPU), and 4 is storage such as a fixed disk. A medium (hereinafter, referred to as a fixed disk), 5 is a display device, 6 is a keyboard, and 7 is a printer.

[0010] The memory 2 temporarily stores output data of the AD converter 1. The CPU 3 calculates (updates) the maximum value or the minimum value by comparing with the previous value every time the raw data is read from the memory 3, the function of sequentially storing the maximum and minimum values on the fixed disk 4, the input from the keyboard 6. It has a function of reading information, a function of displaying data read from the fixed disk 4 on the display device 5, a function of controlling printing by the printer 7, and the like.

The operation in such a configuration will now be described. Here, a case where the data length is 1 Mword (M is 10 ⁶ , word is 16 bits) and the sampling frequency is 1 KHz is taken as an example. When the total length is displayed, (1/1 KHz) x 1
Since Mword = 1000 (seconds), it takes 1000 seconds to roll display the waveform from one end of the screen to the other.

The horizontal (time axis) resolution of a display device is usually 50
Since the number of lines is 0 to 1000, it is difficult to understand how the waveform changes. Therefore, in the present invention, in addition to the reproduced waveform (also referred to as an actual waveform) A displayed on the original setting as shown in FIG.
An enlarged waveform B for the purpose of only recognizing a change in the waveform (specifically, a change in the latest predetermined number of waveform data) is displayed in an auxiliary manner.

Note that this auxiliary enlarged waveform is deleted after the roll display operation is completed so that inconsistency with the original setting does not occur. After the roll display operation is completed, a necessary portion of the waveform can be enlarged and displayed by using an enlargement function normally provided in the device to observe the waveform in detail.

Such an operation is performed under the control of the CPU 3. FIG. 3 shows the operation flow. After the start of the measurement, the following operation is performed. When T / div is smaller than 100 mS, a normal waveform display is performed, and then the process proceeds.

Note that T / div is a display time required for one division width on the horizontal axis, and is set in advance. The set T / div is usually 100
If it is less than mS, it is a normal waveform display, and it is easy to recognize a change in the waveform. However, in the case of 100 ms or more, a roll display in which a waveform flows with time is displayed, and further 1 S
If it is larger, it is hard to recognize the change in the waveform.

If T / div is greater than 100 ms, roll display is performed. In this case, when T / div is larger than 1S, the update display of the roll display is slow and it is difficult to grasp the change in the waveform. Therefore, an auxiliary enlarged waveform display (called a ghost waveform display) is performed together with the roll display. . This ghost waveform is displayed by, for example, a broken line. When T / div is smaller than 1S, the ghost waveform display is not performed because the change in the waveform is relatively easy to grasp.

If the measurement stop command has not been issued and the data acquisition has not been completed, the process returns to the above. If the measurement stop command has been issued or the data acquisition has been completed, proceed to the next step. If there is a ghost waveform, the screen display is erased and the measurement is terminated.

The above operation is managed and controlled by the CPU 3.
Controlled. The CPU 3 also performs processing for obtaining the maximum and minimum values of the input data, and stores the maximum and minimum values on the fixed disk 4.
Control for sequentially storing the minimum value, processing for receiving input information from the keyboard 6, and control for output to the printer 7 are performed. However, since these operations are not directly related to the present invention, the description of the operations is omitted here.

It should be noted that the foregoing description has been directed to specific preferred embodiments for the purpose of illustration and illustration of the invention. Therefore, the present invention is not limited to the above-described embodiments, and includes many more modifications without departing from the spirit thereof.
This includes deformation.

For example, the ghost waveform is indicated by a broken line, but is not necessarily limited to this. The waveform may be made different from the actual waveform by changing the brightness or color, or the type of the broken line.

[0021]

As described above, according to the present invention, by displaying an auxiliary waveform temporarily without any special setting or operation, the data length is particularly long, and the waveform change can be recognized. The difficult roll waveform display can be made easy to understand.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a display example of a waveform.

FIG. 3 shows an operation flow.

FIG. 4 is a diagram showing an example of an input data waveform.

FIG. 5 is a diagram showing a transition of a display of an observed waveform.

FIG. 6 is a diagram showing a transition of display of another observation waveform.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 A / D converter 2 Memory 3 CPU 4 Fixed disk 5 Display device 6 Keyboard 7 Printer

Claims (4)

[Claims] 1. A waveform observing apparatus for obtaining maximum and minimum values from data obtained by digitally converting an input signal, storing the data in a storage medium, reading out the data, and reproducing and displaying the reproduced data on a screen. A waveform observation device characterized in that an enlarged waveform representing a change in the waveform is displayed together. 2. The waveform observation apparatus according to claim 1, wherein said enlarged waveform is displayed only during execution of roll display. 3. The actual waveform of the roll display is indicated by a solid line,
3. The waveform observation device according to claim 1, wherein the enlarged waveform is displayed by a broken line. 4. The waveform observation apparatus according to claim 1, wherein the enlarged waveform is different in luminance or color from an actual waveform of roll display.