JPH0812208B2 - Waveform display device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a waveform display device for reproducing and displaying waveform data of a plurality of frames stored in a data memory, and more particularly to improving a display form. Is.

<Prior Art> For example, in a digital oscilloscope, after the analog input signal Ain is converted into a digital signal by the A / D converter 1 as shown in FIG. The waveform data of n frames is stored in the waveform storage unit 2 as the waveform data of the frame, and the waveform data stored in the waveform storage unit 2 is displayed on the display unit 3 including a display such as a CRT. .

By the way, when displaying a waveform in such a conventional waveform display device, as shown in FIG. 6 (a), a plurality of frames are overlapped (with a vertical axis and a horizontal axis in common) and displayed at the same brightness, As shown in (b), only one selected frame is displayed.

<Problems to be Solved by the Invention> However, according to the former method, since a plurality of waveforms are displayed with the same brightness in an overlapping manner, a specific waveform and a time relationship between the plurality of waveforms are identified from the display screen. Is difficult.

Further, according to the latter method, although the display screen is not complicated, it is difficult to grasp the relationship of temporal changes in the displayed waveform.

The present invention focuses on such a point, and an object thereof is to provide a waveform display device capable of visually grasping a time relationship between displayed waveforms from a display screen.

<Means for Solving the Problems> The waveform display device of the present invention is capable of converting an analog input signal applied to one input terminal into an analog input signal.
After converting to digital signal by D converter, waveform data of multiple frames is stored in data memory as waveform data of 1 frame each time trigger condition is satisfied, and waveform data of multiple frames stored in this data memory is reproduced and displayed. In the display device, a first display processing block that reproduces and displays at least one frame selected from waveform data of a plurality of frames stored in the data memory at a first brightness, and a plurality of frames of the plurality of frames stored in the data memory. A second frame which selects a frame other than the selected one frame from the waveform data and simultaneously reproduces and displays it on the same display device with a second brightness lower than the first brightness by using a common vertical axis and horizontal axis.
The display processing block of is provided.

<Operation> In the waveform display according to the present invention, at least one frame of a plurality of frames that are simultaneously displayed in superposition is displayed with higher brightness than other frames, and the frames displayed with high brightness are displayed according to the time relationship. By switching, it is possible to visually comprehend the relationship of temporal changes between a plurality of waveforms.

<Example> Hereinafter, an example of the present invention is described in detail using a drawing.

FIG. 1 is a structural explanatory view showing an embodiment of the present invention.
The same parts as those in FIG. 4 are designated by the same reference numerals. In the figure, reference numeral 4 is an operation unit for setting various measurement conditions, memory conditions, display conditions and the like in the microprocessor 7, and is provided with a rotary encoder 5 and a keyboard 6. The microprocessor 7 controls the operation of the entire device. The microprocessor 7 also controls the frame length of the data memory 2, the area for storing the output data of the A / D converter 1, the number of divided frames, and the like. A measurement end signal is added to the microprocessor 7 from the A / D converter 1. Reference numeral 8 is a random access memory used as a system memory, and 9 is a read-only memory in which a control program is stored. Reference numeral 10 denotes a display control device, which reads waveform data from the data memory 2 and inputs it to the display unit 3 under the control of the microprocessor 7 and selectively performs brightness modulation in frame units. The display unit 3 includes a first display processing block 11 that reproduces and displays at least one frame selected from waveform data of a plurality of frames stored in the data memory 2 at a first brightness, and a plurality of storage units stored in the data memory 2. A second luminance display processing block for selecting at least one frame from the waveform data of the frames and reproducing and displaying the same on the same display simultaneously with the second luminance lower than the first luminance.
It is composed of 12 and CRT 13. Each display processing block 11,
Each of the 12 has a graphic random access memory.

 The operation of the apparatus thus configured will be described.

First, the rotary encoder 5 and the keyboard 6 of the setting unit 4 are operated to input into the microprocessor 7 measurement conditions, the number of frame divisions of the data memory 2, the frame length, the frame number to be displayed with high brightness, and the like.

The microprocessor 7 sets A / A according to the set conditions.
Start D converter 1.

The waveform data D output from the A / D converter 1 is sequentially stored in the data memory 2 for each frame according to the set conditions. When the A / D converter 1 outputs a predetermined number of frames of data, it outputs a measurement end signal S to the microprocessor 7.

The microprocessor 7 identifies the measurement end signal S input from the A / D converter 1 to identify the display control device 10
Set various conditions for waveform display.

The display control device 10 reads the waveform data D stored in the data memory 2 to the display unit 3 in frame units according to the set conditions. At this time, the waveform data of the frame to be displayed with high brightness is transferred to the first brightness display processing block 11 and stored in the random access memory of that block, and the waveform data of all frames is transferred to the second brightness display processing block 12. Then, it is stored in the random access memory of the block. Then, the waveform data of each frame transferred and stored in each of the blocks 11 and 12 is simultaneously displayed as a graphic screen on the CRT 13 which is a common display.
Here, since the waveform data of the frame transferred and stored in the first brightness display processing block 11 is subjected to the brightness modulation, the brightness is higher than that of the waveform data of the frame transferred and stored in the second brightness display processing block 12. Will be displayed.

FIG. 2 is an explanatory diagram showing the flow of such a display operation process, in which the waveform data of the second frame stored in the data memory 2 is displayed with high brightness and the waveform data of other frames are displayed with low brightness. The example which displays is shown.

After the display state as shown in FIG. 2 is set, the frame to be displayed with high brightness can be arbitrarily switched by rotating the rotary encoder 5 as shown in FIG. That is, the microprocessor 7 controls the waveform data of the corresponding frame from the data memory 2 to be transferred and stored in the first luminance display processing block 11 according to the designation from the rotary encoder 5. Such switching of high-intensity display frames can be sequentially performed along the front-back direction of the time axis.

FIG. 3 shows an example of measuring and displaying waveform data of 8 frames, and FIG. 3A shows an example in which the second frame is designated as the high-intensity display frame. In addition, a part of the CRT 13 is provided with an area for displaying a frame number to be displayed with high brightness as a menu. By rotating the rotary encoder 5 to the right from the state of (a),
The frame number to be displayed with high brightness changes from "2" to "3", and the waveform of the third frame on the display screen of the CRT 13 is displayed with high brightness as shown in (b).
By continuing to further rotate the rotary encoder 5 to the right from the state of (b), the frame number to be displayed with high brightness is changed to "8", and as shown in (c), the CRT1
The waveform of the 8th frame on the display screen of 3 is displayed with high brightness. By rotating the rotary encoder 5 to the left from the state of (c), the frame number to be displayed with high brightness changes from "8" to "1", and the waveform of the frame displayed with high brightness is also changed. It will be sequentially switched toward the first frame.

According to such a display mode, it is possible to selectively display a high-luminance frame of interest, so that it is possible to improve the complexity of the display screen due to a plurality of waveforms being overlapped and displayed with the same luminance as in the conventional case, From the display screen, it is possible to easily understand the specific waveform and the time relationship between a plurality of waveforms. Then, by rotating the rotary encoder 5, the frame displayed with high brightness changes instantaneously, so that it is possible to reproduce and display a plurality of waveforms captured before as a moving image.
It is also effective for observing the behavior of waveforms.

In the above embodiment, the example in which the content of the data memory 2 is read to the display unit 3 via the display control device 10 has been described.
The microprocessor 7 may directly read the contents of the data memory 2 and transfer and store them in the display unit 3.

Also, the means for changing the designation of the high-intensity display frame is not limited to the rotary encoder, but may be performed by a keyboard or external communication data.

In addition to displaying all the waveform data stored in the data memory 2 on the display device 3 to display only one frame with high brightness, it is possible to selectively display a plurality of arbitrary waveform data and further to display them. It is also possible to display one frame or a plurality of frames in high brightness and change them one after another.

Further, a series of display operations may be performed after the waveform data of the set number of frames is acquired by one start-up operation, or the waveform data of a predetermined number of frames is acquired by repeating measurement and display for each frame. After that, a plurality of waveforms may be simultaneously displayed and a specific waveform may be selectively displayed with high brightness.

<Effects of the Invention> As described above, according to the present invention, it is possible to realize a waveform display device in which the time relationship between displayed waveforms can be visually recognized from the display screen, and the practical effects are great.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing an embodiment of the present invention, FIGS. 2 and 3 are explanatory views of the operation of FIG. 1, and FIG. 4 is a structural explanatory view showing an example of a conventional device, and FIG. Figures and 6 are the fourth
It is explanatory drawing of the operation | movement of a figure. 1 ... A / D converter, 2 ... data memory, 3 ... display unit, 11 ... first luminance display processing block, 12 ... second luminance display processing block, 13 ... display unit.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-55-144552 (JP, A) JP-A-55-67657 (JP, A) JP-A-61-94136 (JP, A) JP-A-56- 74658 (JP, A) Actual opening 62-37780 (JP, U) Actual opening 58-16690 (JP, U) Actual opening 62-156883 (JP, U)

Claims (1)

[Claims] 1. An analog input signal applied to one input terminal is converted into a digital signal by an A / D converter, and a plurality of frames of waveform data are stored in a data memory as one frame of waveform data each time a trigger condition is satisfied. In the waveform display device for reproducing and displaying the waveform data of a plurality of frames stored in the data memory, at least one frame selected from the waveform data of the plurality of frames stored in the data memory is reproduced and displayed at a first brightness. The first display processing block and the same display at a second brightness lower than the first brightness by selecting a frame other than the selected one frame from the waveform data of a plurality of frames stored in the data memory. Waveform display, characterized in that a second display processing block for reproducing and displaying at the same time with a vertical axis and a horizontal axis common to the display device is provided. Location.