JP3077374B2 - Data display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data display device, and more particularly to an improvement in a data display device having a function of displaying data in a histogram.

[0002]

2. Description of the Related Art In a conventional data display apparatus, when displaying a histogram of data, a configuration for changing the scale in the histogram display and redisplaying the data is as shown in FIG. In such a configuration, based on the setting from the scale register 10, the data from the data memory 7 determines the display width at the first place by the histogram calculating means 8 and converts it into data according to the frequency. I do. The converted data is stored in the frequency memory 9 and output as display data.

The operation of this configuration and the problems will be described with reference to the drawings. 4 (a) to 4 (c) are screens actually displayed, and FIG. 5 is an explanatory diagram of the relationship between the step size of the histogram display and the data resolution on the display screen. First, FIG. 4B shows the histogram displayed in FIG. 4A enlarged 1.1 times on the horizontal axis. FIG. 4C shows the histogram displayed in FIG. 4A multiplied by 1.5 on the horizontal axis. Looking at this graph,
It can be understood that the graph is not uniformly enlarged and only the graph in FIG. 4B has strange stripes such that the data amount is alternately different. This is the moire phenomenon in the histogram display generally called. The moire phenomenon will be specifically described with reference to FIG. For example, when displaying a histogram in which the horizontal axis is frequency, the step size of the histogram is 1.5 MHz, and the measured data is 1.
It is assumed that there is every 3 MHz. (That is, the resolution of the measurement data and the division of the histogram are very close but slightly different) Will be. This is shown in FIG. 5 (a).
Therefore, the frequency of this measurement data is shown in a graph in FIG.
As shown in (b), the data is observed as if the data alternately increased and decreased.

[0004]

Therefore, there is a problem that the measured data is recognized as increasing or decreasing even though the measured data is uniform. The present invention has been made to solve the above-described problems, and has as its object to realize a data display device that does not cause a so-called moire phenomenon regardless of the resolution of measurement data or the setting of a histogram.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a data memory.
From the data from
The span to set the span value of the histogram display in a data display device that converts the data to data and displays the histogram
Stores a value register and the value of the measured data resolution
And the number of divisions of the span value.
The division number register, and (the division number) × (the resolution
Value) × N (where N is (the interval of the histogram display)
Width) = (the span value) / (the number of divisions) = (the decomposition
Function value) / Integer satisfying N)
Display data calculation means for outputting the
An integer N that is close and smaller than the span value
Histogram calculation means for changing the correction span value
A data display device, characterized in that it comprises a.

[0006]

According to the present invention, a span in which the moire phenomenon does not occur is calculated based on the resolution of data, and displayed based on the calculated corrected span.

[0007]

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

In FIG. 1, reference numeral 1 denotes a central value register which stores a central value of a display determined by a set value. 2
Is a span value register for storing a display span value determined by the set value. Reference numeral 3 denotes a resolution register for storing the value of the resolution of the measured data. A division number register 4 sets the number of divisions in the histogram display. Reference numeral 5 denotes a display data calculating means, which calculates the range of displayable data using the data stored in the resolution register 4 and the data stored in the division number register 5.
Numeral 6 denotes a correction calculating means which corrects the output from the span value register using the data from the display data calculating means 5 and outputs a corrected span value. 7 stores data measured by the data memory. Numeral 8 denotes a histogram calculating means for calculating the histogram of the measured data from the data memory 7 based on the correction span value outputted from the correction calculating means 6 and the central value stored in the median register 1. I do. A frequency memory 9 stores data generated by the histogram calculation means 8.

In such a configuration, set values are stored in various registers 1 to 4, and the display data calculation means 5
The value of the data resolution is multiplied by the number of divisions in the histogram display. The correction operation unit 6 calculates an integer multiple of the value of the result of the multiplication, smaller than the value stored in the span value register 4, and closest to the value stored in the span value register 4. The calculation result is output to the histogram calculation means 8 as a correction span value, and based on the correction span value, a histogram display is executed for a predetermined center value.

The principle of these operations will be described in detail. Normally, in the histogram display, a span value is externally set and enlarged as shown in FIG. 4, so the relationship between the span value and the moire phenomenon will be described. It is determined by dividing the span value of the histogram (the width of the portion to be displayed) by the number of divisions (expressed as a number of bar graphs). Therefore, the step size of the histogram = span value / number of divisions can be expressed as follows. As described above, if the step size of the histogram becomes closer to the data resolution, the number of data falling within the histogram step width will be uneven if the real multiple of the data resolution width does not match the histogram step size. Becomes Therefore, in order to eliminate the moiré phenomenon, it is necessary to satisfy the following formula: histogram step size = data resolution value × N (N is an integer). When the span value for preventing the moiré phenomenon, that is, the corrected span value, is expressed by the number of divisions and the data resolution using the following equation, the corrected span value = (number of divisions × data resolution value) × N. Note that the number of divisions is determined in advance. Therefore, the display data calculation means 5 multiplies the data resolution value by the number of divisions, and sets N such that it is closest to and smaller than the span value actually set from the outside.
Is calculated by the correction calculating means 6 to output a corrected span value.
In the histogram display using this corrected span value,
As described above, since the number of pieces of data falling within the step size of the histogram is always uniform, the moire phenomenon does not occur. FIG. 2 is an explanatory diagram of a histogram display using the corrected span value. From the figure, it is understood that the width of the histogram display is changed from the set span value to the correction span value.

[0011]

As described above in detail, according to the present invention, it is possible to realize a data display device in which the moire phenomenon does not occur regardless of the set value and the data resolution.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of the present invention.

FIG. 2 is an explanatory diagram of a display in the present invention.

FIG. 3 is a basic configuration diagram of a conventional example.

FIG. 4 is an explanatory diagram of a moiré phenomenon.

FIG. 5 is an explanatory diagram of a moire phenomenon.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 median value register 2 span value register 3 resolution register 4 division number register 5 display data calculation 6 correction calculation means 7 data memory 8 histogram calculation means 9 frequency memory

Claims (1)

(57) [Claims] 1. A method for displaying data from a data memory.
Determine the width and convert to data according to the frequency, histogram
In the data display device to be displayed, the histogram display
A span value register for setting a span value;
A resolution register for storing a data resolution value;
A division number register for storing the division number of the span value;
(Number of divisions) × (value of the resolution) × N (where N is (the
Histogram display step size) = (Span value) / (Previous
Number of divisions) = (the value of the resolution) / an integer satisfying N)
Display data calculation means for outputting the correction span value by calculation
And closest to the span value and smaller than the span value
The correction span value is changed by an integer N such that
A data display device comprising a histogram calculation means .