JPS58144711A - Waveform memory device - Google Patents

Abstract

PURPOSE:To draw a signal waveform without distortion, by changing the moving speed of an X axis in accordance with the rate of change of an Y axis. CONSTITUTION:An analog input signal is imparted to a terminal 1 and further applied to a CPU3 through an A/D converter 2. A waveform memory 4 is connected to the CPU3. The outputs of the CPU3 are imparted to D/A converters 5 and 6 for the X axis and the Y axis respectively. The outputs of the converters 5 and 6 are imparted to an XY recorder 7. The CPU3 reads the outputs of the X and Y axis components out of the memory 4, and outputs the Y axis component to the recorder 7. The X axis component is computed by the CPU3 based on the rate of change of the Y axis component. When the change in the Y axis component is small, the moving speed of the X axis is made fast.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a waveform storage device that digitally converts the waveform of an input signal to be recorded, stores it, and displays the stored contents on an XY recorder.

[Description of prior art]

Conventionally, this type of waveform storage device digitally converts the input signal to be recorded at a speed sufficient to record it, and converts it to -
It is stored in a longitudinal waveform memory, and the contents of this memory are read out at a constant speed suitable for the operation of the xy recorder, and the I? Outputting to the recorder.

However, the I-axis sweep speed of the conventional waveform storage device, i.e.
The moving speed of the X-axis of the y-recorder is the output change k of the X-axis component.
Regardless, it remains constant while outputting one waveform. For this reason, as shown in Fig. 1, the display screen K of the KIT recorder,
A large part of the entire waveform! When writing a waveform with axis mounting, the moving speed of the (Fig. 1a, c) are given a speed that is slower than necessary.

It takes a lot of time to completely write a partial Y-axis tube, and when writing many waveforms of the same type, it has been desired to shorten the recording time.

[Purpose of the invention]

The present invention improves this pitting by setting the moving speed of the X-axis variably according to changes in the Y-axis component output and force, and when the change in the X-axis is small, K changes the moving speed of the X-axis. It is an object of the present invention to provide a waveform storage device that can automatically increase the speed and record distortion-free waveforms in a short time.

[Summary of the invention]

The present invention includes a MU-D converter that converts an input signal to be recorded into a digital signal, a memory that records the output of the MU-D converter, and a memory that controls the MU-D converter and the memory and stores the output in the memory. a control circuit that sequentially outputs the digital signal and divides it into an X-axis component and an In a waveform storage device equipped with a second DM converter that converts the digital signal of the X-axis component into an analog signal and outputs it as an X-axis signal, the rate of change in the digital signal level of the The control circuit is configured to determine that when the rate of change is larger than the reference rate of change, the X-axis sweep speed is a predetermined speed, and when the rate of change is smaller than the reference rate of change, the X-axis sweep speed is the predetermined speed. It is characterized in that the control is performed so that the speed is higher than the predetermined speed.

[Principle of the invention]

The principle of the present invention is that the X-axis sweep speed of the conventional waveform storage device is 1.5 to 1.5 as shown in FIG. What was constant, $IF
As shown in FIG. 5, the times tet and ts where the X-axis changes are small are set to be adjusted to slow speeds, and the time T where the X-axis is large is adjusted to a slow speed.

[Explanation based on examples]

Next, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 4 is a circuit diagram of a device according to an embodiment of the present invention. An analog input signal is applied to the input terminal IK, and the input terminal 1 is connected to the CPU 5 via the AD converter 2. CPU3
A waveform memory 4 is connected to. The output of this CPTj3 is connected to the Dmu converter 5 for the X-axis circumference and the Dmu converter 6 for the Y-axis circumference, and the outputs of the Dmu converters 5 and 6 are
Connected to the input of Y recorder 7. Furthermore, a data setting key switch 8 is connected to the CPO 3, and is configured to input information on the response speed and sensitivity of the XY repuder 7 in both the x and y axes.

With this configuration, the analog signal input to the input terminal 1 is converted into a digital signal by the digital converter 2, and is stored in the waveform memory 4 via the CPU 3. CP(
F3 successively outputs the digital signal stored in waveform memory 4, divides this signal into an X-axis component and an X-axis component, and outputs the divided signal to DMU converters 5 and 6.

Now data setting key switch gK, X of xy recorder 7
Response speed of axis component output “x (am/sec),
Response speed of X-axis component output 1y (aIL/5ee),
Axis sensitivity 1, (x/V), Y-axis sensitivity f By (tx
/V) and give it to CPU3, CPU
3 Gt KOOX Y l/ Find the maximum standard rate of change lYI of the pen movement speed allowed on the Korg's maxi axis from the following equation.

x Next, based on this value, as shown in the flowchart in Figure 5, the outputs of both the X and Y axis components taken from the waveform memory 4 are successively output, and the X axis component output is left unchanged! ! Output to record duff.

On the other hand, at this time, the X-axis/component output is calculated using cpυ3, where the rate of change of the X-axis component output is 7y ff ノy−□ ・・・・・・・・・−(2) a, and this rate of change y is Δ! ,
・・・・・・・・・If (3), CPU3 is X
The first moving speed ffi fJ is the moving speed of the axis component output.
cl is selected, and the interval t□ corresponding to this moving speed 9e is calculated using the following formula, and t! X after l time
An axis movement is performed.

JI Here, ΔIs is the resolution of the Dmu converter 50 around the X axis.
, the moving distance of the Y-axis 1 sampling data output sound on the X-axis is expressed by the following equation.

Δlx −fix I Vz ”=・・−” (
5) Also, if this rate of change jy is Δy≦Y, (6), the CPU 3 sets the second moving speed faster than the first moving speed 15 as the moving speed of the X-axis component output. A moving speed f is selected, and an interval t corresponding to this moving speed 'w is calculated using the following formula, and the X-axis movement is performed after a time of t.

Ma11 From this K, when the change in the Y-axis component output is small, K is
The moving speed of the axis becomes faster, and when the change in the opposite 6cy axis component output is large, the moving speed of the X axis becomes slower.

In the above example, the sensitivity, response speed, and full scale information were set on the premise that the XY recorder is a specific model, but x! If the recorder is not integrated with the waveform storage device and an unspecified model is connected, the sensitivity, appropriate response, and full scale information will differ depending on the model, so in this case, CPUK is suitable for the recording device. It can also be configured to set sensitivity, response speed, and full scale information.

Furthermore, in the above example, the moving speed W of the X axis with respect to the change in the Y axis
t''-x* and gIj are used, but they are not limited to two, and can be subdivided into 'JFI s' 4. It can also be configured to select an optimal moving speed from among them.

Also, if the input signal liquid shape is different from the waveform shown in Figure 1, and the Y export force is constant and the X axis output changes partially,
It is also possible to shorten the marking time by changing the moving speed of the Y-axis according to changes in the X-axis output.

〔Effect of the invention〕

As described above, according to the present invention, by configuring the X-axis moving speed to be variable according to the rate of change of the Y-axis, the pen speed of the XY recorder is adjusted according to the waveform change, and the Can write signal waveforms without distortion in the tube.

In addition, by setting the xY recorder's sensitivity and pen speed values from CPUK, the trouble of manually setting these values of the xy recorder is eliminated, and it is an excellent feature that allows you to automatically write waveforms at the optimal speed. effective.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a recording waveform of an XY recorder. FIG. 2 is a diagram showing the temporal change in the X-axis output of the conventional device. FIG. 3 is a diagram showing the change over time in the X export force of the device of the present invention. FIG. 4 is a circuit diagram of a device according to an embodiment of the present invention. FIG. 5 is a flowchart of the main parts of the CPU. l...Input east terminal, 2...Music D converter, 3...C
P.U. 4... Waveform memory, 5.6... Dm converter, 7...
・XY recorder, 8...Data setting key switch. Patent Applicant Yokogawa Electric Corporation Representative Patent Attorney Naotaka Ide

Claims (1)

[Claims] (1) A digital converter that converts the input signal to be recorded into a digital signal, a memory that records the output of the digital signal, and a digital signal that controls the digital converter and the memory and stores the output in the memory. a control circuit that reads out a digital signal and outputs it separately into an X-axis component and an In a waveform storage device equipped with a second DM converter that converts the digital signal of the axis component into an analog multiplexed signal and outputs it as an The control circuit includes means for comparing, and when the rate of change is larger than the reference rate of change, the X-axis return speed -IK is a predetermined speed, and when the rate of change is smaller than the reference rate of change, K is: A waveform storage device characterized in that the X-axis sweep speed is controlled to be higher than the predetermined speed.