JP2000180476A - Waveform displaying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To implement a waveform displaying device capable of displaying the whole image of a waveform in real time. SOLUTION: In a waveform displaying device, waveform data obtained by measurement is recorded in a storage means 3, and the waveform data is read from the storage means 3 and displayed on a screen at the time of reproduction and display. In the waveform displaying device, waveform data is compressed simultaneously with the recording of the raw data of waveform data in the storage means 3, and the compressed data is recorded in the storage means 3. The compressed data is read from the storage means 3, and the waveform of the compressed data is displayed on a display means 6 at the time of reproduction and display.

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 which records waveform data obtained by measurement in a storage means, reads out the waveform data from the recording means at the time of reproduction and displays, and displays the waveform data on a screen.

[0002]

2. Description of the Related Art Waveform measuring devices convert various physical quantities, such as temperature, pressure, strain resistance, etc., into electric signals by conversion means suitable for each application, and change these electric signals into a waveform on a display screen. This is a device that is displayed as a symbol so that changes in physical quantities can be observed and measured.

In recent years, the memory length of a waveform display device such as a digital oscilloscope has become extremely long, and an HDD (hard disk drive) is provided as storage means in addition to a semiconductor memory. By directly recording the waveform data in these storage means, it is possible to perform a long recording from, for example, 128 MB to several GB. Although progress has been made in recording waveform data in this way, there remains a problem in how to record once recorded waveform data.

FIG. 4 is a diagram showing a configuration example of a conventional waveform display device. In FIG. 4, the A / D converter 1 performs A / D conversion (analog-to-digital conversion) on the measurement data acquired by the acquisition operation. The data processing means 2
The D-converted data is processed into waveform data representing a time-series signal change. Further, the data processing means 2 has an A / D
The offset adjustment or the like is performed on the converted data.

[0005] The storage means 3 records the waveform data processed by the data processing means 2. The storage means 3 is, for example, an HDD
It consists of. The designation unit 4 designates a portion to be displayed in the waveform data recorded in the storage unit 3. The designation is performed based on an address, a file number, and the like. When reproducing and displaying the raw data of the waveform data, the display control means 5 reads the waveform data designated by the designation means 4 from the storage means 3 and causes the display means 6 to display the read waveform data as it is. When reproducing and displaying the compressed data of the waveform data, the display control means 5 reads out the waveform data designated by the designation means 4 from the storage means 3 and compresses the read waveform data by the compression means 7. It is displayed on the display means 6.

FIG. 5 is a flowchart showing a display operation procedure of the waveform display device of FIG. When it is desired to grasp the entire image of the waveform on the screen, displaying the waveform data as it is as raw data results in an enormous amount of display, and it takes a long time to observe the waveform. In order to prevent this, conventionally, the read waveform data is displayed after being compressed. FIG. 5 shows the display procedure. In FIG. 5, raw data is read from a storage unit such as an HDD (process A1), and the read data is temporarily stored in a memory (process A2). The raw data stored in the memory is compressed (process A3), and the compressed data is displayed (process A4).

FIG. 6 is a diagram showing the relationship between the waveform data recorded in the storage means and the displayed waveform data. FIG.
In the storage area B of the storage means 3, the waveform data is recorded over the entire memory length L. The compressed data of the waveform data recorded in the storage area B is displayed on the main window W1 of the display screen C.

The total memory length L is, for example, several hundred MW to several GW.
Therefore, even if the waveform data is compressed, all the waveform data cannot be displayed on the screen at once. For this reason, a part of the waveform data in the entire memory length L is displayed, and the display part is changed by scrolling the storage area B by the specifying means 4, and the entire image of the waveform is observed. In the zoom window W2, an enlarged waveform of a part of the waveform displayed in the main window W1 is displayed. Raw data is used to display the enlarged waveform.

However, the conventional example shown in FIG. 4 has the following problems. When displaying the entire image of the waveform, several MB to several tens M
It takes several seconds to read the B raw data, and several seconds to compress the read raw data. For this reason,
It was impossible to display the waveform in real time.
In order to display a waveform in real time, it is necessary to end the display processing in 0.1 to 0.2 seconds. As described above, a large amount of waveform data can be recorded by increasing the memory length for taking in the waveform data. However, on the other hand, the time required to reproduce and display the large amount of recorded waveform data is increased.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and the waveform data is recorded in a storage means in the form of raw data and compressed data. It is an object to realize a waveform display device capable of displaying an entire image in real time.

[0011]

SUMMARY OF THE INVENTION The present invention is a waveform display device having the following configuration.

(1) In a waveform display device which records waveform data obtained by measurement in a storage means and reads out the waveform data from the recording means at the time of reproduction and display, and displays the waveform data on a screen, the raw data of the waveform data is stored in the storage means. Compression means for compressing the waveform data in parallel with recording on the means, and recording the compressed data in the storage means, and reading the compressed data from the storage means at the time of reproduction display, and displaying the waveform of the read compressed data on the display means. And a display control means for causing the display device to perform a display operation.

(2) The compression means is capable of setting a plurality of compression rates, generates compressed data of different compression rates for the same waveform data, and records each of the compressed data in the storage means. The waveform display device according to 1).

(3) Designating means for designating a predetermined part in the waveform data stored in the storage means, and compressed data corresponding to the part designated by the designating means are read from the storage means, and the read compression data is read. The waveform display device according to (1), further comprising: a partial waveform display means for displaying a data waveform on the display means.

(4) The designating means designates a predetermined portion in the displayed compressed data waveform, reads raw data of the waveform of the portion designated by the designating means from the storage means, and reads the read raw data. (3) An enlarged waveform display means for displaying a data waveform on the display means is provided.
The waveform display device as described in the above.

(5) The waveform display device according to (4), wherein the enlarged waveform display means displays the waveform of the compressed data and the waveform of the raw data in association with each other on a display screen.

(6) The compression means has a compression ratio of 1 / n.
If (n is an integer), the waveform data giving the maximum value and the minimum value are taken one by one from the n pieces of continuously obtained waveform data, and these data are stored in the storage means as compressed data. (1) The waveform display device according to (1).

[0018]

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 the present invention. 1 that are the same as those in FIG. 4 are given the same reference numerals. FIG.
Then, the compression means 10 compresses the waveform data in parallel with recording the raw data of the waveform data in the storage means 3 and records the compressed data in the storage means 3. The compression unit 10 can set a plurality of compression ratios, generates compressed data of different compression ratios for the same waveform data, and records each of the compressed data in the storage unit 3.

When displaying the entire image of the waveform, the display control means 11 reads the compressed data from the storage means 3 and causes the display means 6 to display the waveform of the compressed data. When a part of the displayed compressed data waveform is enlarged and displayed, the display control means 11 causes the display means 6 to display the raw data. The specifying means 12 specifies a predetermined part in the waveform data stored in the storage means 3. The designating unit 12 is, for example, an input key displayed on a screen, a key provided on a keyboard, or the like. The partial waveform display means 13 includes the designation means 12
The compressed data corresponding to the part designated by the above is read out from the storage means 3 and the waveform of the read compressed data is displayed on the display means 6.
To be displayed.

The specifying means 12 specifies a predetermined portion in the displayed compressed data waveform. The enlarged waveform display means 14 reads the raw data of the waveform specified by the specifying means 12 from the storage means 3 and causes the display means 6 to display the read raw data waveform. Further, the enlarged waveform display means 14 displays the waveform of the compressed data and the waveform of the raw data in association with each other on the screen.

The operation of the waveform display device shown in FIG. 1 will be described. FIG. 2 is an explanatory diagram of an operation of recording waveform data. In parallel with the recording of the raw data D1 of the waveform data in the storage means 3, the compression means 10 compresses the waveform data and compresses the compressed data D1.
2 and D3 are recorded in the storage means 3. The compression means 10 can set a plurality of compression ratios. In the example shown, the compression ratio is 1
/ 100 and 1/1000 are set. Compressed data D2 and D3 of each compression ratio are recorded in the storage means 3. Storing the compressed data in the storage means 3 hardly causes overhead because the data is compressed.
For example, if the compression ratio is 1/100, 10
Compressed data is recorded only once for zero recording.

FIG. 3 is an explanatory diagram of an operation for displaying waveform data. In FIG. 3, raw data and compressed data of waveform data are recorded in a storage area B of the storage means 3. When reproducing and displaying the entire image of the waveform, the compressed data recorded in the storage area B is displayed on the main window W1 of the display screen C. The waveform that can be displayed in the main window W1 becomes a part of the compressed data due to the limitation due to the configuration of the display unit 6 and the like. The display waveform is changed by scrolling the display portion E by the specifying means 12, and the waveform is displayed over the entire storage area B. As a result, the entire image of the waveform can be observed.

Since the data to be scrolled is compressed data, scrolling can be performed at high speed. For example, if the compression ratio is 1 /
In the case of 100, scrolling can be performed at a speed 100 times faster than the raw data. In the zoom window W2, an enlarged waveform of a part of the waveform displayed in the main window W1 is displayed. Raw data is used to display the enlarged waveform. The waveform of the main window W1 and the waveform of the zoom window W2 are displayed in association with each other on the screen.

The compression means 10 has a compression ratio of 1 / n.
If (n is an integer), the waveform data giving the maximum value and the minimum value are taken one by one from the n pieces of continuously obtained waveform data, and this data is stored in the storage means 3 as compressed data. You may.

[0025]

According to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, the compressed data of the waveform data is recorded in parallel with the recording of the raw data of the waveform data in the storage means. Therefore, even when the waveform data is recorded for a long time, when displaying the whole image of the waveform, the compressed image can be directly displayed by reading the compressed data, and the whole image of the waveform can be displayed in real time.

According to the second aspect of the present invention, since compressed data having different compression ratios are prepared, the whole image of the waveform can be grasped with various resolutions.

According to the third aspect of the present invention, the entire image of the waveform can be grasped even if all the waveform data cannot be displayed on the screen at once due to physical restrictions.

According to the fourth aspect of the present invention, if a portion to be zoomed in is specified with respect to the compressed data of the waveform, the raw data of the waveform corresponding to the specified portion is read, so that the zoomed waveform can be observed at high speed. it can.

According to the present invention, the correspondence between the compressed waveform and the raw waveform can be easily grasped on the screen.

According to the sixth aspect of the present invention, the waveform data can be compressed while leaving characteristic portions such as the maximum value and the minimum value.

As described above, according to the present invention, it is possible to realize a waveform display device capable of grasping the entire image of a waveform in real time.

[Brief description of the drawings]

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

FIG. 2 is a diagram illustrating the operation of the present invention.

FIG. 3 is an operation explanatory diagram of the present invention.

FIG. 4 is a diagram showing a configuration example of a conventional waveform display device.

FIG. 5 is an explanatory diagram of the operation of the device of FIG. 4;

FIG. 6 is an operation explanatory diagram of the device of FIG. 4;

[Explanation of symbols]

 2 data processing means 3 storage means 6 display means 10 compression means 11 display control means 12 designation means 13 partial waveform display means 14 enlarged waveform display means

Claims (6)

[Claims] 1. A waveform display device which records waveform data obtained by measurement in a storage means, reads out the waveform data from the recording means and displays it on a screen at the time of reproduction and display, and displays raw data of the waveform data in the storage means. Compression means for compressing the waveform data in parallel with recording the compressed data and recording the compressed data in the storage means;
A waveform display device comprising: display control means for displaying a waveform of the read compressed data on a display means. 2. The compression unit according to claim 1, wherein a plurality of compression ratios can be set, the compression unit generates compressed data having different compression ratios for the same waveform data, and records each of the compressed data in a storage unit. 2. The waveform display device according to 1. 3. Designating means for designating a predetermined part in the waveform data stored in the storage means, and reading out the compressed data corresponding to the part designated by the designating means from the storage means. 2. The waveform display device according to claim 1, further comprising: a partial waveform display means for displaying the waveform on the display means. 4. The specifying means specifies a predetermined part in the displayed compressed data waveform, reads raw data of the waveform of the part specified by the specifying means from the storage means, and reads the read raw data. 4. The waveform display device according to claim 3, further comprising an enlarged waveform display means for displaying the waveform on the display means. 5. The waveform display device according to claim 4, wherein the enlarged waveform display means displays the waveform of the compressed data and the waveform of the raw data in association with each other on a display screen. 6. When the compression ratio is 1 / n (n is an integer), the compression unit converts one waveform data that gives a maximum value and a minimum value among n pieces of continuously obtained waveform data. 2. The waveform display device according to claim 1, wherein the data is taken individually and stored in the storage means as compressed data.