JPH04125689A - Waveform display device - Google Patents

Abstract

PURPOSE:To automatically operate a scroll at the time of enlarging and scrolling a waveform by outputting changing reading address to a data memory at the time of a scroll mode designating input. CONSTITUTION:An AD converter 16 converts input analog signals into digital signals by starting an operation by the operation starting means of an inputting means 11 and writes them in a data memory 17 from writing addresses from a CPU 12. The data are read out by the reading addresses from the CPU 12 and displayed. Then, the CPU 12 changes the addresses of the data to be read out of the data memory and reads out them in order to operate a scroll display when the scroll mode is designated by a scroll mode setting means 11. Thus, a manual operation is not necessary at the time of scrolling the waveform on a screen to right and left.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a waveform display device for displaying an input signal waveform of a digital oscilloscope or the like, and particularly to a waveform display device with an improved display format.

(Prior art) A digital oscilloscope converts the input analog signal into
A device that converts the data into D, temporarily stores it in a memory, and displays this digital data is used to display data consisting of multiple points obtained by sampling at the sampling rate of the AD converter. Therefore, by increasing the sampling rate, even minute changes in the waveform can be displayed.

(Problem to be Solved by the Invention) By the way, when trying to import and display waveform data with a large number of data points (data number of about 1000 points or more) on this waveform display device, it is necessary to know the entire image of the waveform. All points may be displayed on one screen, but if you want to search for a singular point in a waveform, you need to enlarge the waveform on the time axis and scroll while observing the details to find the singular point. This state is shown in FIG. In the figure, (a) is, for example, 512,0
A diagram showing the entire data of point 00, (b) is an enlarged display of the displayed waveform shown in (a) on the time axis. In the figure, reference numeral 1 indicates an entire display image of a waveform consisting of 51.2,000 points of data on the screen, and reference numeral 2 indicates an enlarged waveform image in which a portion of the waveform is enlarged on the time axis and displayed. This enlarged waveform is scrolled left and right on the screen by rotating the knob 3. The score of this waveform is 512.0
When the number of points increases from 00 points to 1,000,000 points, if the points are spaced equally, it is necessary to turn knob 3 many times to scroll through the entire range, which is cumbersome to operate. .

The present invention has been made in view of the above points, and an object of the present invention is to provide a waveform display device that enlarges and scrolls a waveform in order to observe the details of the waveform, and does not require manual scrolling. It is about realization.

(Means for Solving the Problems) The present invention to solve the above-mentioned problems has an input means including an operation start/stop setting means, a scroll mode setting means, a display image ((expansion/reduction setting means, etc.), and an input analog input means. an AD converter that converts a signal into a digital signal; a large-capacity data memory into which output signals from multiple points of the AD converter are written; A write address for writing to the data memory is input to the data memory, and a changing read address is output to the data memory in response to a scroll mode designation input from the input means.
It is characterized by comprising a PU.

(Operation) The operation is started by the operation start means of the input means. A.D.
The converter converts the input analog signal into a digital signal,
Write to the data memory using the write address from the CPU. Data is read and displayed using the read address from the CPU. When the scroll mode is specified by the scroll mode setting means, the CPU 2 changes the address of the data to be read from the data memory, reads the data, and displays the data in a scroll manner.

(Embodiment 911) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Figure 1 is a block diagram of an embodiment of the present invention.

In the figure, 11 is a start and stop button for instructing the device to start or stop operation, a scroll button for scrolling or stopping scrolling, and an enlargement of the size of the waveform image on the screen. This keyboard is equipped with a zoom button for zooming out, and other buttons for normal control. 12 is an RO in which control programs necessary for performing operations are stored;
M13, programs for setting initial conditions, etc., and C which is nil gl by RAM14 which outputs instructions for implementing the conditions in response to condition input from the keyboard 11.
It is PU. A trigger circuit 15 generates a trigger when the input signal exceeds a voltage specified by the CPU 12 after a start signal generated by the CPU 12 is input in response to a start instruction from the start button of the keyboard 11.

16 is A that converts the input analog signal into a digital signal.
The D converter starts AD conversion in response to a trigger input from the circuit 15. The sampling rate of AD conversion is determined by the clock given from the CPU 12. 17, the data from the AD converter 16 is sent to the CPU1
A data memory that is written and stored by the write address from CPU 12, tf! The information is read out based on the seat address and displayed on the display unit 18. The data from the data memory 17 is sent to the display unit 18 by the CP.
It can also be done via U12.

Next, the operation of the embodiment configured as described above will be explained.

When the start button on the keyboard 11 is pressed, the CPU 12
Initial conditions are set by input from AM14, and the ROM
The control program from 13 starts the operation and sends a start signal to the trigger circuit 15. After receiving the activation signal, the trigger circuit 15 generates a trigger when the input signal exceeds a voltage specified by the CPU 12 and inputs it to the AD converter 16 . The AD converter 16 converts the input signal A by the signal.
The D conversion is sampled by the clock input from the CPU 12 and converted into a digital signal, and the data is written to the address specified by the write address of the CPU I 2 in the data memory 17. The data memory 17 is a large capacity memory having a capacity of, for example, 1.0 (10°000 bytes).

The data written in the data memory 17 can be used to display images in the entire display mode or enlarged display mode as shown in FIG.
to be displayed. In FIG. 2, (a) is an example of the entire display mode in which all data is displayed, and (b) is an example of the enlarged display mode in which the waveform is enlarged on the time axis. The enlarged waveform is displayed by pressing the zoom button on the keyboard 11, and the enlargement rate is adjusted by the zoom knob.

When the scroll button on the keyboard 11 is pressed, the auto scroll mode is entered. When the display on the screen is the entire display as shown in FIG. Move data on the screen from left to right or from right to left. The direction of this scrolling can be selected from the left or right by inputting from the keyboard 11. Further, the magnification factor can be adjusted using the zoom knob described above.

When you enter scroll mode, the display on the screen will be as shown in Figure 2 (
If the image is enlarged as shown in b), scrolling is started at that enlargement rate. In either case, pressing the scroll button again will stop scrolling. While scrolling in the auto-scroll mode, when the end of the waveform appears on the screen, the CPU 12 stops reading the data memory 17 and automatically stops auto-scrolling. FIG. 3 shows the screen being scrolled in the auto-scroll mode. As shown in the figure, among a series of waveforms, the data read out by the readout address from the CPU 12 is displayed as a solid line waveform on the screen.

It should be noted that the present invention is not limited to the above embodiments. Auto scrolling can be started and stopped using any function such as a function key or a touch panel without using a push button switch. Further, the start button and the stop button may be separate switches.

(Effects of the Invention) As described above in detail, according to the present invention, there is no need to manually scroll the waveform on the screen by turning a knob or the like, which has a great practical effect. .

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a diagram showing the display on the screen, (a) shows the entire display, and (b) shows an enlarged waveform. FIG. 3 is a diagram of the screen during scrolling, and FIG. 4 is an explanatory diagram of the conventional scrolling method. 11... Keyboard 13... ROM 15... Trigger circuit 17... Data memory 12... CPU 14... RAM 16... AD converter 18... Display section

Claims (1)

[Claims] Input means (11) equipped with operation start/stop setting means, scroll mode setting means, display image expansion/reduction setting means, etc., and an AD converter (16) for converting input analog signals into digital signals. a large-capacity data memory (17) into which output signals from multiple points of the AD converter (16) are written, and the input means (1).
1), the AD converter (16
) is input to the data memory (17), and in response to a scroll mode designation input from the input means (11), the data memory (17) A waveform display device comprising: a CPU (12) that outputs a read address that changes with respect to the waveform display device.