JP3223486B2 - Waveform analyzer - Google Patents

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 partially enlarged display of an observed waveform.

[0002]

2. Description of the Related Art Waveform analyzers such as oscilloscopes
A measuring instrument indispensable for R & D, analysis, and maintenance of various electronic devices and electronic circuits, and a conversion means suitable for various applications such as vibration, acceleration, temperature, pressure, and strain resistance. Is widely used in various fields other than the electronics industry, since it can be converted into electric signals and changes in these electric signals can be observed and measured as display images.

[0003] In displaying and observing an input signal waveform by such a waveform analyzer, there is a case where it is desired to magnify and observe a specific portion showing a peculiar change from the entire displayed waveform. For example, in a partially enlarged display of an input signal waveform in a conventional general digital oscilloscope using the X axis as a time axis and the Y axis as a voltage axis, the enlargement ratios (zoom ratios) of the X axis and the Y axis are individually desired. It is done by changing the value.

FIG. 9 is a diagram showing an enlarged waveform display example of such a conventional waveform analyzer. In the figure, an observation target waveform 102 is displayed on a display screen 101, and an enlarged area in the X-axis direction of the display waveform 102 is designated by a cursor 103, and an enlarged area in the Y-axis direction is designated by a cursor 104.

[0005]

However, according to such conventional enlargement display processing, the enlargement display cursor 103,
The enlarged display range is specified by moving the enlarged display waveform by appropriately operating 104, but the processing result is only displayed as an enlarged waveform instead of performing the display with the entire waveform displayed. Must rely on the observer's intuition, and it is difficult to accurately specify the enlarged display range.

As a result, an unnecessary portion is frequently displayed in an enlarged manner, or an area to be enlarged does not fit on the display screen, and it takes a considerable number of times to properly extract a desired portion and display the enlarged portion. You have to repeat the trial. In addition, obtaining the number of data points and various statistics related to the waveform of the enlarged display portion as display data on the screen requires a huge amount of time because the setting of the enlargement range is uncertain and the statistical processing in the enlarged area is displayed. Since it requires memory, it has not been put to practical use.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to make it possible to easily and appropriately specify a range of waveform enlargement, and to enlarge a waveform of a portion enlarged and displayed together with an enlarged waveform. It is an object of the present invention to provide a waveform analysis device capable of obtaining data points and various statistics related to display data as display data.

[0008]

In order to achieve the above object, according to the present invention, an input signal waveform is converted into digital data at a resolution higher than the display resolution, and is taken into a storage means. A waveform analysis device configured to read the read digital data and reproduce and display the read digital waveform as a measurement waveform, wherein an enlarged display area for specifying a portion of the reproduced measurement waveform to be enlarged and displayed as a two-dimensional area on a display screen a designation unit, and enlarged display means for enlarged display of digital data for the area specified by the enlarged display area designation means reads from said storage means, said storage means
Waveform enlargement control means for calculating and displaying statistics of the enlarged display portion based on the fetched digital data .

[0009]

[0010]

Thus, the observer can specify a portion of the reproduced measurement waveform to be enlarged and displayed as a two-dimensional area while viewing the reproduced measurement waveform on the display screen, and also displays the statistical information of the enlarged display portion on the screen. Confirmation can be performed, and data analysis in any designated area can be performed efficiently.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a main part of a frequency counter as an example of a waveform analysis apparatus which is a premise of the present invention, and shows functional blocks for designating an enlarged area.

In FIG. 1, an input means 11 to which an external signal is applied is constituted by an amplifier, a comparator, etc., and outputs an external input signal to a storage means 12 as input data. As this storage means 12, a normal RAM is used. The calculation means 13 reads the input data from the storage means 12 according to the conditions set by the enlargement area designating means 15, and executes the calculation processing according to the set method. The display means 14 displays the result of the arithmetic processing by the arithmetic means 13 and uses, for example, a CRT. The enlarged area specifying means 15 is used to specify an area to be enlarged as a box-shaped / rectangular two-dimensional area in the X-axis range and the Y-axis range by operating, for example, a key or a rotary knob while viewing the display screen. Performs arithmetic control. In FIG. 1, the illustration of a CPU that gives a control signal to each functional block to perform overall control is omitted.

The operation of such a configuration will be described. FIG. 2 is a view showing an example of the display screen. An enlarged designated area 22 designated by the control of the enlarged area designation means 15 has a box-like shape in a part of the measurement display waveform 21 displayed on the display screen 2 such as a CRT screen.
This indicates that the image is displayed as a rectangular two-dimensional area.

FIG. 3 shows that the enlarged area designating means 15
It is an example of a display screen when an enlargement designation area in the axial direction is set. By operating keys and rotary knob, etc.
A line 231 indicating one end of the X-axis direction enlargement designation area and a line 232 indicating the other end move in the A and B directions along the X-axis direction, and a desired enlargement designation in the X-axis direction is made at the positions of these lines 231 and 232. You can specify an area. FIG.
It is an example of a display screen when an enlargement designation area in the Y-axis direction is set by the enlargement area designation means 15 following the X axis. By operating a key, a rotary knob, or the like, a line 241 indicating one end of the designated area to be enlarged in the Y-axis direction and a line 2 indicating the other end are designated.
Reference numeral 42 moves in the C and D directions along the Y-axis direction, and a desired enlargement designated area in the Y-axis direction can be designated at the positions of these lines 241 and 242. Enlarged area designation means 15
Calculates the coordinates selected and designated by operating the keys and the rotary knob in FIGS. 3 and 4,
The display means is instructed to display as a box-shaped / rectangular two-dimensional area.

When the designation of the enlarged area is completed in this way, an arithmetic processing for displaying the statistical processing for the enlarged display range is performed as necessary. FIG. 5 is a block diagram showing a configuration of a main part of a frequency counter as an embodiment of the waveform analyzer according to the embodiment of the present invention, which has an arithmetic processing function for displaying a statistical process for a range to be enlarged and displayed. 1
The same reference numerals are given to the parts common to. The difference from the configuration block diagram of FIG. 1 is that in FIG.
6 is provided.

The operation in FIG. 5 will be described with reference to the explanatory diagram of the state in which the enlarged area is designated in FIG. 6 and the explanatory diagram of the enlarged waveform in FIG. In FIG. 6, parts common to those in FIG. 2 are denoted by the same reference numerals. The statistic of the data displayed on the entire display screen 2 is displayed in the statistic display area 23 of FIG. 6, and the average value of all data (AVERAGE), the maximum value of all data (MAXIMUM), and the Minimum value (MI
NIMUM), standard deviation of all data (STANDARD)
(VARIATION) is displayed.

In FIG. 7, the enlarged waveform 24 corresponds to the designated enlarged region 22 in FIG. In the partial statistic display area 25, the statistic of the data in the enlarged designated area 22 in FIG. 6 is displayed, and the average value (AVE) of all the enlarged waveform data is displayed.
RAGE), the maximum value of all enlarged waveform data (MAXIMU
M), the minimum value of all the enlarged waveform data (MINIMUM),
Standard deviation of all enlarged waveform data (STANDARD VA
RIATION) is displayed.

The display of the partial statistic display area 25 is performed by controlling the waveform enlargement display by the waveform enlargement control means 16.
This is realized by performing the same operation as the normal waveform reading. That is, the method of reading from the storage means 12 is determined by determining the enlargement designation area 22 to be enlarged and displayed. Thereafter, the waveform can be handled in the same manner as the normal waveform display, and thus the partial statistic display area 25 of FIG. It is possible to display the statistics of the data in the enlarged designated area 22.

Here, such a partial statistic display can be handled in the same manner as a normal waveform display if the resolution of the measurement data stored in the storage means 12 is high.

FIG. 8 is a flowchart showing the flow of the entire operation of FIG. First, a measurement signal is input to the input means 11 from the outside, and a predetermined format (mainly as a digital signal)
To store the data in the storage means 12 (step a). Thereafter, the data is read out from the storage means 12 by the calculation means 13 and the measured values are calculated (step b). The calculation results are converted into display data by the display means 14 to display the X and Y waveforms of the normal measured values. Perform (step c).
Thereafter, it is determined whether or not there is a waveform enlargement instruction (step d).
If there is no instruction to expand the waveform, only the analysis waveform display as shown in FIG. 2 is performed, and the measurement is completed.

On the other hand, when there is a waveform enlargement instruction, for example, a rotary knob provided in the apparatus is rotated in accordance with the operation of the enlargement area designating means 15 so that the X-axis direction enlargement designation area is first set as shown in FIG. Lines 231 and 23 indicating both ends
2 is moved to and displayed at a desired position in the A and B directions along the X axis to specify an enlarged area in the X axis direction. Then, as shown in FIG. By moving and displaying 241 and 242 at desired positions in the C and D directions along the Y axis, an enlarged area in the Y axis direction is designated. Then, the enlarged area designating means 15 computes the designated area by the computing means 13 and displays the result of the computation on the display means 14 so as to transform the enlarged designated area 22 into a box-shaped / rectangular two-dimensional form as shown in FIG. (Step e).

The enlarged designated area 2 designated in this way
In order to enlarge and display 2, waveform enlargement control means 1
6 extracts the data in the area designated by the enlarged area designation means 15 from the storage means 12 and gives a control signal to the calculation means 13 and the display means 14. Specifically, the waveform enlargement control means 16 gives the arithmetic means 13 an enlargement coefficient determined according to the area designated by the enlargement area designation means 15.
In response to this, the calculation means 13 performs calculation for displaying the waveform and also performs calculation for displaying the partial statistic, and performs an enlarged display as shown in FIG. 7 (steps f and g).

By displaying the partial statistics in the enlarged display as described above, data analysis in an arbitrary designated region can be efficiently performed. The calculation display of the partial statistics may be a selective additional function.

In the above description, a frequency counter having an extremely high data resolution has been described. However, the present invention is applicable to any measuring instrument having a data resolution higher than the display resolution in the designated area 22 of FIG. It is also effective for waveform analyzers such as oscilloscopes and FFT analyzers.

[0026]

As described above, according to the present invention,
The enlarged display range of the waveform can be specified visually and easily without relying on the observer's intuition, and various statistical information of the enlarged display can be checked on the screen. A waveform analyzer that can be performed efficiently can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram illustrating an example of an embodiment of a waveform analyzer according to the present invention.

FIG. 2 is a view showing an example of a display screen in the apparatus shown in FIG. 1;

FIG. 3 is a view showing an example of a display screen when an enlargement designation area in the X-axis direction is set by the apparatus shown in FIG. 1;

FIG. 4 is a view showing an example of a display screen when an enlargement designation area in the Y-axis direction is set by the apparatus shown in FIG. 1;

FIG. 5 is a view showing another embodiment of the waveform analyzer according to the present invention.

FIG. 6 is a view showing an example of a display screen in the apparatus shown in FIG. 5;

FIG. 7 is an example of an enlarged waveform display in the apparatus of FIG. 5;

FIG. 8 is a flowchart showing a flow of the operation of the apparatus of FIG. 5;

FIG. 9 is an enlarged view of an example of a waveform displayed by a conventional waveform analyzer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Input means 12 Storage means 13 Calculation means 14 Display means 15 Magnification area designation means 16 Magnification waveform control circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01R 13/00-13/42 G09G 5/36 520

Claims (1)

(57) [Claims] 1. A waveform configured to convert an input signal waveform into digital data at a resolution higher than a display resolution and to store the digital data in a storage means, and to read out and display the digital data captured in the storage means as a measurement waveform. An analysis device, comprising: an enlarged display area designating unit that designates a portion of the reproduced measurement waveform to be enlarged and displayed as a two-dimensional area on a display screen; and digital data of an area designated by the enlarged display area designating unit. And a waveform enlargement control unit that reads out from the storage unit and displays it in an enlarged manner, and a waveform enlargement control unit that calculates and displays a statistic of the enlarged display portion based on the digital data captured in the storage unit. A waveform analysis device provided.