JPH08160078A - Automatic scaling method - Google Patents

Abstract

PURPOSE: To decide a coordinate axis which is suitable for observing waveforms by comparing the signs of the maximum and minimum values of waveform data with each other and distinguishing a scaling when the signs are the same from that when the signs are different from each other. CONSTITUTION: The coordinate axis which is suitable for observing waveform data is decided by storing waveform data 51 acquired by means of a measuring instrument and automatically scaling 52 the data. At the time of deciding the coordinate axis, a rounded numerical value is outputted 53. The automatic scaling is performed in such a way that the signs of the maximum and minimum values of the waveform data are compared with each other and, when they coincide (do not coincide) with each other, the scaling is performed against a single-pole (double-pole) waveform. For the single-pole waveform, the lower-limit value of the coordinate axis is found by rounding the upper-limit value of the coordinate axis and coordinate width when, for example, the sign of the waveform data is positive. When the upper- and lower-limit values have different signs, the lower limit value is made '0' and the upper-limit value is corrected. For a double-pole waveform, the divided value is rounded and, when the position of the waveform is on the positive (negative) side, the negative-side (positive-side) devided value is found from the positive-side (negative-side) divided value and the upper-limit (lower-limit value is found from the positive-side (negative-side) divided value. Therefore, the locus of the waveform data can be brought to the center side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic scaling method, and in particular, when displaying a locus of waveform data, the waveform data of the whole or a designated section can be displayed without designating an upper limit value and a lower limit value of coordinate axes. The present invention relates to an automatic scaling method capable of determining coordinate axes displaying a trajectory.

[0002]

2. Description of the Related Art A conventional example of an automatic scaling method for displaying a trajectory of waveform data on a graphic terminal of a computer for the purpose of observing the waveform data acquired by a measuring device will be described with reference to FIG. FIG. 8 is an example in which the locus of waveform data is displayed on the XY plane in which the Y coordinate equally divided with the number of divisions being 4 is automatically scaled.
In FIG. 8, the maximum value 1 of the waveform data, the minimum value 2 of the waveform data, the upper limit value 3 of the Y coordinate axis, the lower limit value 4 of the Y coordinate axis, Y
The coordinate width 5 of the coordinate axis and the division value 6 of the Y coordinate axis are shown.

In the conventional automatic scaling method, the rounding value of the maximum value 1 of the waveform data is set to the upper limit value 3 of the coordinate axis.
And the rounding value of the minimum value 2 of the waveform data is set as the lower limit value 4 of the coordinate axis. Here, rounding is to obtain a value such that the absolute value of the rounded value is equal to or exceeds the absolute value of the rounded value. The coordinate width 5 is a difference value between the upper limit value 3 and the lower limit value 4 of the coordinate axis, and the division value 6 is the coordinate width 5
Is the quotient obtained by dividing by the dividend and the divisor.

[0004]

However, in the conventional automatic scaling method described above, when the minimum absolute value of the waveform data is sufficiently close to zero as compared with the maximum absolute value of the waveform data, The lower limit value of the absolute value of the coordinate axis obtained by the conventional scaling method is much smaller than the upper limit value of the absolute value of the coordinate axis and becomes a non-zero value.As a result, the coordinate axis may not be suitable for waveform observation. is there.

In addition, when the sign of the maximum value and the sign of the minimum value of the waveform data are different, the position of the coordinate zero may not coincide with the dividing line of the coordinate, and in this case also the coordinate axis becomes unsuitable for waveform observation. I will end up.

Further, the coordinate axis obtained by rounding is 1
In the case of the type, since the locus of the waveform data is not arranged near the center of the coordinate axis, the coordinate axis may not be suitable for waveform observation.

An object of the present invention is to provide an automatic scaling method capable of determining a coordinate axis suitable for waveform observation regardless of the magnitude relationship between the maximum value and the minimum value of waveform data, the difference in sign, and the like. .

[0008]

According to a first aspect of the invention, in a device for displaying waveform data composed of two or more sample points on a two-dimensional plane having one or two coordinate axes equally divided, the waveform is The maximum value and the minimum value of the data are compared, and the coordinate axes are determined separately for the case of a unipolar waveform having the same code and for the case of a bipolar waveform having a different code.

According to the second aspect of the invention, in a device for displaying waveform data composed of two or more sample points on a two-dimensional plane having one or two coordinate axes equally divided,
The configuration is such that two or more kinds of coordinate axes are obtained by the rounding process, and the optimum coordinate axis is determined so that the locus of the waveform data is arranged near the center of the coordinate axes.

[0010]

In the first invention, the sign of the maximum value and the sign of the minimum value of the waveform data are compared. Then, in the case of a unipolar waveform having the same sign, the coordinate axis is determined by a method of obtaining the upper limit value of the absolute value of the coordinate axis and the coordinate width of the coordinate axis. In the case of bipolar waveforms having different signs, the coordinate axis is determined by the method of obtaining the division value of the coordinate axis and the position of the zero point. This makes it possible to determine a coordinate axis suitable for waveform observation regardless of the magnitude relationship between the maximum value and the minimum value of the waveform data and the difference in sign.

In the second invention, 2 obtained by rounding processing
From the coordinate axes of more than one type, find the coordinate axis with the minimum absolute value of the intermediate value obtained from the maximum value of the waveform data and the minimum value of the waveform data, and the intermediate value obtained from the upper limit value of the coordinate axis and the lower limit value of the coordinate axis. Select to determine the optimum absolute axis. This makes it possible to determine the optimum coordinate axis that allows the locus of the waveform data to be arranged near the center of the coordinate axis.

[0012]

EXAMPLE FIG. 1 shows the configuration of an example of the present invention. In this embodiment, the data acquisition unit 51, the scaling unit 52,
It comprises a rounding unit 53 and a display unit 54. The data acquisition unit 51 is for storing the waveform data acquired by the measuring device in the storage device of the computer. The scaling unit 52 is for determining coordinate axes suitable for observing the waveform data acquired by the data acquisition unit 51. The rounding processing unit 53 includes the scaling unit 52.
This is a processing unit required for performing the automatic scaling process in 1., and by inputting a numerical value and a correction value, a rounded numerical value is output. The display unit 54 is for displaying the locus of the waveform data acquired by the data acquisition unit 51 on the graphic terminal of the computer based on the coordinate axes determined by the scaling unit 52. And
The following processing is performed based on this configuration.

Next, the automatic scaling method according to the first invention will be described with reference to the flowchart of FIG. In FIG. 2, first, the sign of the maximum value and the sign of the minimum value of the waveform data are compared (process S7), and if the signs match, scaling for a unipolar waveform is performed (process S7).
8) On the other hand, if the signs do not match, scaling for the bipolar waveform is performed (process S9).

Here, a flow chart in the case of the scaling S8 of the simple waveform is shown in FIG. That is, the sign of the waveform data is determined (process S10), and if the sign is positive, the upper limit of the coordinate axis is rounded (process S11). Then
Round the coordinate width of the coordinate axis (process S12) and process S11
The lower limit value of the coordinate axis is obtained from the upper limit value obtained in step S1 and the coordinate width obtained in step S12 (step S13).

Then, the sign of the upper limit value of the process S11 is compared with the sign of the lower limit value of the process S13 (process S14). If the signs do not match, the lower limit value is changed to zero and the positive waveform is displayed. The lower limit value of the coordinate axis is set to zero or a positive value (process S15). Next, the upper limit is corrected by the amount that the lower limit is changed to zero in process S15 (process S16). If the sign is negative in the determination of the process S9, the lower limit of the coordinate axis is rounded (process S17). Next, the coordinate width of the coordinate axis is rounded (step S18), and the upper limit value of the coordinate axis is obtained from the lower limit value obtained in step S17 and the coordinate width obtained in step S18 (step S19).

Thereafter, the sign of the lower limit value of the process S17 and the sign of the upper limit value of the process S19 are compared (process S20). If the signs do not match, the upper limit value is changed to zero and the negative waveform is displayed. The upper limit of the coordinate values to be set is set to zero or a negative value (process S21). Next, the upper limit value is corrected by the amount of changing the upper limit value to zero in the process S21 (process S22).

Next, FIG. 4 shows a flowchart in the case of scaling S9 of the bipolar waveform. That is, first, the division value is rounded (process S23), and then it is determined whether the waveform is located on the negative side (process S24). If the waveform is located on the negative side, the division value on the positive side is obtained. (Processing S25),
The number of divisions on the negative side is obtained from the number of divisions on the positive side (process S2
6). If the waveform is located closer to the negative side in the determination of process S24, the number of divisions on the negative side is obtained (process S27), and the number of divisions on the positive side is obtained from the number of divisions on the negative side (process S28).

Then, when the positive side division number and the negative side division number are obtained by processing S25 and processing S26 or processing S27 and processing S28, the upper limit value of the coordinate axis is obtained from the positive side division number (processing S29) Next, the lower limit of the coordinate axis is obtained from the number of divisions on the negative side (process S30).

Further, the rounding process according to the second invention is shown in FIG.
This will be described below. The rounding process is performed by the rounding unit 53 shown in FIG. 5, in the rounding process 31, first, the numerical value 32 and the correction value 33 are input. Then, in the mantissa / exponent separation 34, the inputted numerical value 32 is separated into a mantissa part 35 and an exponent part 36. Further, the mantissa part rounding 37 inputs the mantissa part 35, and when this is approximated to the element of the mantissa part sequence 38, outputs the number of terms of the corresponding element as the mantissa part number 39. It should be noted that the mantissa sequence 38 is a sequence of an arbitrary number of elements with the element Xi being a real number in the range of 1 <Xi <10.

Then, the adder 40 adds the correction value 33 to the mantissa term number 39. Further, the mantissa part number 39 and the exponent part 37 to which the correction value 33 has been added in this way are combined in the mantissa / exponent combination 41, and the rounded value 42 is output.

FIG. 6 shows a flowchart of the automatic scaling method according to the second invention. That is, the correction value is initialized before executing the scaling process (process S4
3) Then, scaling processing including the rounding processing described in FIG. 5 is performed (processing S44). Here, the process S43
The correction value of is used as a correction value input of the rounding process inside the scaling process.

Further, from the upper limit value and the lower limit value of the coordinate axis obtained by the scaling process in the process S44,
The center value of the coordinate axes is obtained, and the deviation between the center value of the waveform data obtained from the maximum value and the minimum value of the waveform data is obtained (process S
45). Next, the absolute value of the deviation value in the process S45 is compared with the minimum deviation value stored in advance (process S46). If the absolute value of the deviation value in the process S45 is small, the process S44 is performed.
Upper limit value and lower limit value of the coordinate axis obtained in step S4
The absolute value of the deviation value of 5 is stored (processing S47). Next, the correction value of the processing S43 is updated to a different value (processing S4
8), it is determined whether or not to repeat (process S49),
If the result of this determination is that the process is repeated, the processes from step S44 to step S49 are repeated again.

In this case, the rounding process in the scaling process of step S44 is to input the correction value updated in step S48 as a correction value input. Also, the process S
If the result of determination in 49 is not repeated, the stored upper and lower limit values of the coordinate axis in step S47 become the upper and lower limit values of the coordinate axis obtained by the automatic scaling method.

A more specific flow chart of the scaling method of the present invention is shown in FIG. That is, the sign of the maximum value of the waveform data and the sign of the minimum value of the waveform data are compared (process S7), and if the signs match, the correction value of the upper limit value or the lower limit value of the coordinate axis and the coordinate width of the coordinate axis. The correction value of is initialized (process S50), and then scaling for the unipolar waveform is performed (process S8). Here, the correction value of the upper limit value or the lower limit value and the correction value of the coordinate width in the process S50 are used as the correction value input of the rounding process of the upper limit value and the lower limit value and the rounding process of the coordinate width inside the scaling process.

Next, the center value of the coordinate axis is obtained from the upper limit value and the lower limit value of the coordinate value obtained by the scaling process of step S8, and the deviation from the center value of the waveform data obtained from the maximum value and the minimum value of the waveform data. A value is obtained (process S45a).
Further, the absolute value of the deviation value in the processing S45a is compared with the minimum deviation value stored in advance (processing S46a), and the processing S5 is performed.
When the absolute value of the deviation value of 0 is small, the upper limit value and the lower limit value of the coordinate axis obtained in the process S8 and the absolute value of the deviation value of the process S50 are stored (process S47a). Further, the correction value of the upper limit value or the lower limit value and the correction value of the coordinate width are updated to different values (process S51).

After that, it is determined whether or not to repeat the process (process S49a). If the process is to be repeated, the processes S8 to S49a are repeated. In this case, the rounding process inside the unipolar waveform scaling process of the process S8 is the process S5.
The correction value of the upper limit value or the lower limit value and the correction value of the coordinate width updated in 1 are used as the correction input. When the determination result in the process S49a is not repeated, the upper limit value and the lower limit value of the coordinate axis of the stored process S48a become the upper limit value and the lower limit value of the coordinate axis for the unipolar waveform.

On the other hand, if the signs do not match in the determination in step S7, the correction value of the coordinate axis division value is initialized (step S5).
2) Then, scaling for the bipolar waveform is performed (process S9). The correction value of the division value in the process S52 is used as a correction value input for the rounding process of the division value inside the scaling process. Next, the center value of the coordinate axis is obtained from the upper limit value and the lower limit value of the coordinate axis obtained by the scaling process of step S9, and the deviation value from the center value of the waveform data obtained from the maximum value and the minimum value of the waveform data is obtained. (Processing S45b).
Further, the absolute value of the deviation value in the process S52 is compared with the minimum deviation value stored in advance (process S46). If the comparison result shows that the absolute value of the deviation value in the process S52 is small, the process S9 is performed.
Upper and lower limit values of the coordinate axis obtained in step S5
The absolute value of the deviation value of 2 is stored (process S47b). Further, the correction value of the division value is updated to a different value (process S5
3) After that, it is determined whether to repeat (process S49a),
If the determination result is that the process repeats, the process S9 to the process S
Repeat up to 40b. In this case, the rounding process inside the bipolar waveform scaling process of the process S9 is the process S53.
The correction value of the division value updated in step 1 is used as the correction value input. Also,
When the determination result of the process S49a is not repeated, the stored upper limit value and lower limit value of the coordinate axis of the process S47b become the upper limit value and the lower limit value of the coordinate axis for the bipolar waveform.

[0028]

As described above, according to the present invention, regardless of whether the waveform data is a unipolar waveform or a bipolar waveform, the locus of the waveform data can be arranged near the center of the coordinate axis, and the waveform observation can be performed. It is possible to determine a coordinate axis suitable for.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of an embodiment of an automatic scaling method of the present invention.

FIG. 2 is a flowchart showing an automatic scaling method according to the first invention.

FIG. 3 is a flowchart showing scaling of a unipolar waveform according to the first invention.

FIG. 4 is a flowchart showing scaling of a bipolar waveform according to the first invention.

FIG. 5 is a block diagram showing a rounding process used in the second invention.

FIG. 6 is a flowchart of an automatic scaling method according to a second invention.

FIG. 7 is a flowchart of an automatic scaling method according to the first invention and the second invention.

FIG. 8 is an explanatory diagram showing coordinate axes according to a conventional automatic scaling method.

[Explanation of symbols]

 51 data acquisition unit 52 scaling unit 53 rounding processing unit 54 display unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G09G 5/36 510 A 9377-5H

Claims (3)

[Claims] 1. An apparatus for displaying waveform data composed of two or more sample points on a two-dimensional plane having one or two coordinate axes equally divided, wherein the maximum and minimum values of the waveform data are coded. Are compared, and the coordinate axes are determined by distinguishing between a unipolar waveform having the same sign and a bipolar waveform having a different sign, respectively. 2. An apparatus for displaying waveform data composed of two or more sample points on a two-dimensional plane having one or two coordinate axes equally divided, wherein two or more kinds of coordinate axes are obtained by rounding processing. An automatic scaling method, characterized in that an optimum coordinate axis is determined such that the locus of the waveform data is arranged near the center of the coordinate axis. 3. The automatic scaling method according to claim 2, wherein in the rounding process, the input numerical value is used as a rounded value, and the rounding is performed by correcting the rounded value.