JP2002139519A - Interpolation display method for a plurality of waveforms - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interpolation display method for a plurality of waveforms in which the waveform of the highest priority in display is visibly and correctly displayed in a constantly preferential manner while performing the linear interpolation of the measurement data by the channel. SOLUTION: When performing the linear interpolation of the data dots at the previous sampling and the present sampling corresponding to the measurement data classified by channels in the ascending order of the display priority, the minimum and maximum values on each vertical axis are recorded for each dot row between the previous sampling and the present sampling, and the linear interpolation is performed once according to the minimum and maximum values after the recording. The minimum and maximum values on the vertical axis with the data dot in the present sampling after the interpolation located thereon are compared with the previous corresponding minimum and maximum values. In the case where the present minimum value is smaller than the previous minimum, or the present maximum value is larger than the previous maximum value, the values are updated to the present ones, and linear interpolation is performed again according to the updated minimum and maximum values to visibly and correctly display the waveform of the highest display priority in a constant manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of displaying a plurality of waveforms composed of dot rows that can be visually recognized for each channel while linearly interpolating measured data captured for each channel. The present invention relates to a method of interpolating and displaying a plurality of waveforms in which a dot row on the side can always be given priority and displayed accurately.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing an example of a schematic configuration of a measuring instrument such as a waveform recorder. The entirety of the input section 1 is shown in FIG. A central processing unit (CPU) 2 that holds actual measurement data taken at regular intervals via the input unit 1 and performs necessary calculations and general control of each component; , And at least a display unit 4 such as an LCD for outputting and displaying necessary data including the held actual measurement data.

FIGS. 3 (a) to 3 (h) show an example of a waveform for each color which can be distinguished from each other while linearly interpolating the measured data for each channel by applying to the above-mentioned waveform recorder. FIG. 9 is an explanatory diagram showing a conventional method performed at that time.
In this specification, the first channel (hereinafter, referred to as the first channel)
"CHa") and a second channel (hereinafter "CHa").
b)) is taken as an example in the case where measurement data is fetched from two channels. In this case, it is assumed that the display priority on the measurement data side of CHa is high.

In FIG. 1, measured data taken in from CHa is a triangular black background dot (for example, blue) having a high display priority, and measured data taken in from CHb is a round black background dot (for example, red) having a low display priority. Are depicted in different colors. In addition, the triangle white background dot indicates the state of linear interpolation performed between the triangle black background dots as the actual measurement data at the previous sampling and the current sampling, and the circle white dot indicates the actual measurement between the previous sampling and the current sampling at the same time. The respective states of linear interpolation performed between dots of a round black background as data are shown.

That is, according to FIG. 3A, first, the previous sampling time _xn-1 and the current sampling time _xn
In between, the data dots from CHa, shown as triangular black dots _{a n-1} and the triangular black dots _{a n} (measured data), from CHb shown as round black dots _{b n-1} and the round black dots _{b n} The data dots (actually measured data) to be captured are taken and displayed.

[0006] Then, first, the linear interpolation as between the round black dots b _n-1 and the round black dots b _n of lower display priority CHb, as shown in FIG. 3 (b) shows a round white dots It was followed, between the triangular black dots a _n-1 and the triangular black dots a _n of higher display priority CHa Figure 3
As shown in (c), linear interpolation is performed as a triangular white background dot. In this case, the dots P ₁ at a position overlapping with each other as a result of the side of the high display priority CHa is overwritten, round white dots is rewritten in a triangular white dots, finally, as shown in FIG. 3 (d) Will be depicted.

At the next sampling time _{xn + 1} ,
As shown in FIG. 3E, data dots (actually measured data) indicated as triangular black background dots an _{+ 1} from CHa
However, data dots (actually measured data) indicated as round black background dots b _{n + 1} are taken in and drawn from CHb.

[0008] Then, between the display priority lower CHb round black dots b _n and round black dots b _{n + 1} as shown in FIG. 3 (f) is linear interpolation as indicated round white dots. In this case, the dots P ₂ at a position overlapping with each other as a result of the side of the lower display priority CHb be overwritten, originally triangular white dots that should a higher display priority will be rewritten in a round white dots.

In such a state, the dot b of the round black background b
After linear interpolation between _n and the round black background dot b _{n + 1} is performed, as shown in FIG.
between the triangular black dots a _n and a triangular black dots a _{n + 1} of a is linearly interpolated as a triangular white dots. At this time,
Dot P ₃ in the position overlapping with each other as a result of the side of the high display priority CHa is overwritten, with round white dot is rewritten in a triangular white dots, and finally Figure 3
(H).

[0010]

[0006] However, in the case of the conventional method has a higher triangle white dot display priority being描示the position of the dot P ₂ as shown in FIG. 3 (f), subsequent As a result, the round white dots that overlap with each other are overwritten and erased, resulting in a problem that a waveform having a high display priority is not correctly displayed on the display unit 4.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems encountered in the conventional method, and has an object to form a dot row in which actual measurement data taken in for each channel can be distinguished for each channel. It is an object of the present invention to provide an interpolation display method for a plurality of waveforms in which, when displaying as a plurality of waveforms, dots on a channel having the highest display priority among dots overlapping each other by linear interpolation are always given priority.

[0012]

In order to achieve the above-mentioned object, the present invention provides a method for storing data of the last sampling time and the current sampling time for each channel corresponding to actual measurement data taken separately from each channel at intervals. Linear interpolation is performed between the dots in ascending order of display priority, and this is repeated along the time axis with the current sampling time as the previous sampling time and the next sampling time as the current sampling time to obtain a plurality of dot rows as a dot row. In the interpolation display method of a plurality of waveforms in which the waveforms are displayed on the display unit so that the waveforms can be distinguished from each other, each dot row for each channel between the previous sampling time and the current sampling time has a minimum value on each vertical axis. The maximum value is recorded, and the data dot at the current sampling and the next sampling are taken according to the minimum and maximum values after recording. After once linearly interpolating between the data dots of the current time, the minimum value and the maximum value on the vertical axis where the data dot at the time of this sampling after the interpolation are located are compared with the corresponding previous maximum value and the minimum value. If the current minimum value is smaller than the minimum value or the current maximum value is larger than the previous maximum value, the data is updated to the value after interpolation, and the data dots between the current sampling and the next sampling are updated according to the updated minimum and maximum values. By linearly interpolating between the waveforms again, the waveforms having the highest display priority are always displayed with priority so that they can be distinguished from each other.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a method for interpolating and displaying a plurality of waveforms, which is applied to a display unit 4 provided in a measuring instrument such as a waveform recorder shown in FIG. In this case, the waveform data is chronologically captured at predetermined intervals for each channel as digitally converted actual measurement data through each input unit 1.

[0014] Between the data dot at the previous sampling and the data dot at the current sampling for each channel corresponding to each actually measured data for each channel captured in this manner, the display priority is ascending, that is, the display priority is low. One or more interpolation dots (triangular white background dot and round white background dot in the figure) are linearly interpolated so that the channel with the highest degree becomes the last.

[0015] Such processing is repeatedly performed along the time axis with the current sampling time as the previous sampling time and the next sampling time as the current sampling time. The waveform is displayed on the display unit 4 as a possible waveform.

FIG. 1 is a flowchart showing an example of the processing procedure of the present invention when displaying a plurality of waveforms on the display unit 4 so that they can be distinguished from each other. FIG. 2 is a flowchart showing the conventional example shown in FIG. FIG. 4 is an explanatory diagram schematically showing a waveform as a dot row displayed on a display unit 4 when the method of the present invention is applied to the same actual measurement data.

That is, as shown in FIG.
When started, at the last sampling of CHa
(X_n-1) And this time sampling (x_n) And data
The dot is a triangle black background dot a_n-1And triangular black dot a_n
 At the time of the previous sampling of CHb (x_n-1)When
This time sampling (x_n) And the data dot is a round black background
Dot b _n-1And round black dot b_n Measurement shown as
Constant data is captured and displayed.

[0018] Then, the dots P ₁ in the mutually overlapping position as shown in FIG. 2 (b), which will overwrite the side of the high display priority CHa is描示as triangular white dot in its entirety is linear interpolation (Here, since the linear interpolation is performed in the same pattern as in the conventional method shown in FIG. 3 described above, detailed description thereof will be omitted.)

Each of the dot rows of CHa and CHb after the linear interpolation is obtained at the time of the previous sampling (x _n-1 ).
And the minimum value (MI) between the current sampling time (x _n )
N) and the maximum value (MAX) are obtained for each vertical axis.
(B) Recorded separately as shown in the lower column.

Next, unless it is a dot row of the first interpolation,
At the time of this sampling of CHa (x _n) Data Dot
At the next sampling (x_{n + 1}) Data dot and
And during the current sampling of CHb (x_n)data from
Dot and next sampling (x_{n + 1}) Data Dot
Each time between them, as shown in FIG. 2 (c).
Linear interpolation is performed.

After the linear interpolation between the current sampling time (x _n ) and the next sampling time (x _{n + 1} ) is performed in this manner, the linear interpolation is performed between the current sampling time (x _n ) and the next sampling time (x _{n + 1} ). The minimum value (MIN) and the maximum value (MAX) are calculated for each vertical axis, and are recorded separately as shown in the lower column of FIG.

[0022] Then, prior to the minimum and maximum values of the interpolation dot on the vertical axis where the data dots (triangle black dots a _n and round black dots b _n) is located at the current sampling at the current time (x _n) is the corresponding Is compared with the maximum and minimum values of

[0023] At this time, in the example of FIG. 2, the previous data dots (triangle black dots a _n and round black dots b
_n ), the maximum value of the interpolation dots of CHb on the vertical axis was “8”, but this time (x _n )
The maximum value after linear interpolation once between the time of the next sampling (x _{n + 1} ) is changed to “9” so as to be surrounded by a broken line. When the current minimum value is smaller than the previous minimum value or the current maximum value is larger than the previous maximum value, the value is always updated to the value after interpolation.

[0024] Therefore, the data dots (triangle black dot _{a n} and round black dot b at the time of this sampling _{(x n)}
After updating the maximum value of the interpolation dot of CHb on the vertical axis where _n ) is located to “9”, the data dot of CHa at the current sampling (x _n ) and the next time are updated according to the updated minimum value and maximum value. The line between the data dot at the time of sampling (x _{n + 1} ) and the data dot at the time of the current sampling (x _n ) of CHb and the data dot at the next sampling (x _{n + 1} ) of the CHb is straightened again from CHb having a lower display priority. Interpolate.

FIG. 2D shows a dot row after the linear interpolation is performed again in this manner. As shown in FIG. The interpolated dot of x _n ) is overwritten by a triangular white background dot which is an interpolated dot of CHa having a higher display priority as indicated by dot P ₂ , and the waveform having the highest display priority is always displayed with priority. become.

Thus, the same processing is repeated until the data dot at the last sampling is reached, the current sampling time is set as the previous sampling time, and the next sampling time is set as the current sampling time. finish.

Since the present invention is constructed in this manner, the waveforms obtained after linearly interpolating each measured data taken in over time for each channel have the dot row of CHa having the highest display priority. It will be given priority.

Therefore, according to the present invention, it is possible to eliminate the inconvenience that an interpolation dot having a high display priority is overwritten by an interpolation dot having a low display priority which subsequently overlaps and is erased. A plurality of waveforms that can be distinguished from each other can be accurately displayed on the unit 4.

Although the present invention has been described with reference to the illustrated examples, the present invention is not limited thereto. For example,
In the above description, two channels are described as an example. However, even if the number of channels increases, a waveform having the highest display priority can be similarly displayed on the display unit with the highest priority. In addition, the plurality of waveforms may be any waveform that can be displayed on the display unit so that the waveforms with the highest display priority can be distinguished from each other by giving the highest priority, such as a waveform for each color or a waveform for each brightness. Alternatively, the dots can be displayed in different shapes, such as a triangular shape and a round shape, as shown in the illustrated example.

[0030]

As described above, according to the present invention, for each waveform obtained after linearly interpolating each measured data taken in over time for each channel, the dot row having the highest display priority has the highest priority. As a result, it is possible to always accurately display the waveform as a waveform that can be distinguished from each other on the display unit.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating an example of a processing procedure of a method of the present invention.

FIG. 2 is an explanatory diagram showing a display example of a waveform obtained by the method of the present invention.

FIG. 3 is an explanatory diagram showing a display example of a waveform obtained by a conventional method.

FIG. 4 is a block diagram showing a schematic configuration example of a measuring device such as a waveform recorder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input part 2 CPU (Central processing unit) 4 Display part 5 Operation part 6 Output means

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Claims (1)

[Claims] 1. A linear interpolation between data dots between the previous sampling and the current sampling for each channel corresponding to actual measurement data taken separately at intervals from each channel in ascending order of display priority. A plurality of waveforms as a dot row obtained by repeatedly performing the current sampling time as the previous sampling time and the next sampling time as the current sampling time along the time axis are displayed on the display unit so that they can be distinguished from each other. In the waveform interpolation display method, for each dot row for each channel between the previous sampling and the current sampling, the minimum and maximum values on each vertical axis are recorded, and the minimum and maximum values after recording After once linearly interpolating between the data dots at the current sampling and the data dots at the next sampling according to The minimum value and the maximum value on the vertical axis where the data dot at the time of the current sampling are located later are compared with the corresponding maximum value and the minimum value, and the current minimum value is smaller than the previous minimum value or the current maximum value is smaller than the previous maximum value. If the maximum value is large, it is updated to the value after interpolation, and the data dots between the current sampling time and the next sampling time are linearly interpolated again according to the updated minimum value and maximum value, so that the display priority is always maintained. An interpolation display method for a plurality of waveforms, characterized in that the highest waveform side is prioritized and displayed so as to enable mutual recognition.