JPS6161324B2 - - Google Patents

Description

Detailed Description of the Invention For example, when converting a multi-digit digital signal measured with a digital voltmeter into an analog voltage using a digital-to-analog converter and recording this using an automatic analog signal recorder, conventional simply truncated the lower digits, converted the upper 3 digits into analog signals, and added them directly to the recorder. Therefore, for example, if the upper three digits of a digital signal that varies in the range of 0800000μV to 1400000μV are converted to an analog signal and applied to a recorder, the input will be 080000μV to 1400000μV.
~140, so the full scale of the recording paper is 1000
In this case, the recorded figure will be as shown by the curve p in FIG. 1a. Therefore, the utilization of paper space is extremely poor, and the accuracy of recording is not sufficient. Also, if the 4th to 6th digits are converted to analog signals, the input signal of the recorder will be 800~
1000 and 0 to 400, the recorded figure will have a discontinuous part as shown by the curve p' in the same figure,
There is a risk of misreading. Furthermore, when the input digital signal changes in the range of, for example, -200,000 μV to +500,000 μV, if this is added to the recorder described above and the absolute value is recorded, a figure like the one shown by curve q in Figure 1 b will be recorded. Therefore, it is easy to make erroneous observations about the polarity reversal portion. Therefore, the present invention seeks to eliminate the above-mentioned drawbacks when recording digital signals with an analog recorder.

FIG. 2 is a diagram showing the configuration of the apparatus of the present invention, in which an arbitrary digital signal X to be recorded and a signal indicating its polarity are connected to terminals T and P, respectively.
Add to. Further, the center value Y of the range in which the digital signal is expected to change is set in the center value setter S, and a digital signal Z corresponding to the center value of the recording surface of the analog recorder R is applied to the terminal Q. Digital calculator C performs calculations (±X-Y+Z) on these input signals, applies the calculation results to digital-to-analog converter DA, and records the output with analog recorder R.

In other words, the expected change range of the digital signal X to be recorded is, for example, 800000~
If the value is 1400000 and the last three digits are rounded down, the center value Y set in the setting device S is 1100. In addition, the digital signal Z corresponding to the center value of the recording surface in the recorder R is
If it is 500, the expected minimum value of the digital signal sent from the arithmetic unit C will be 200, and the expected maximum value will be 800. Therefore, as shown by the curve v in FIG. 1a, the recorder R records a single continuous curve with high precision by effectively utilizing the entire recording surface.

Further, when the digital signal X to be recorded is expected to vary between, for example, -200000 to +500000, the center value Y set in the setting device S will be +150 if the upper three digits are taken. Also terminal Q
is the center value of the analog recording surface, and thus a digital signal Z corresponding to 500 is added as in the previous case. Arithmetic unit C calculates (±X-Y+
Z), the minimum value of the output signal is +150 and the maximum value is 850. Therefore, one continuous curve is drawn on the analog recorder R, which varies between +150 and +850, as shown by the curve w in FIG. 1b. In this way, even when the input digital signal changes between positive and negative, discontinuous points like curve q do not occur in the recorded curve w, so it is possible to perform analog recording with high precision and easy continuity. can.

FIG. 3 is a diagram showing the configuration of a specific embodiment of the present invention based on the above-mentioned principle, in which the terminals t1,
Each digit of the 9-digit digital signal to be recorded is added to t2...t9. The selection switch G selects appropriate three digits to be recorded from this digital input signal and adds them to the latch circuits L1, L2, L3.
The polarity signal at terminal P is also applied to latch circuit L4. These latch circuits capture the signals at the respective terminals according to the strobe signal at terminal V and apply them to multiplexers M1, M2, and M3. And the outputs of latch circuits L1, L2, L3 are complement circuits H1, H
2, to the multiplexer via H3. Complement circuits H1 and H2 have their lower digits 0.
When , it sends out 10's complement, and when it is other than 0, it sends out 9's complement, and H3 always sends out 10's complement. Also, multiplexers M1, M2, M3 are latch circuits L
When the polarity signal added from 4 is positive, it sends out the signal that is directly added from the latch circuit, and when it is negative, it sends out the complement mentioned above and adds it to the lower digit of adder circuit A2 or digital-to-analog converter DA. .
Therefore, the input signal complement circuits H1, H2, H3 are n
If the digit input signal is negative, add 10 ⁿ⁺¹ to this
Sends the added value.

Furthermore, the center value setter S in FIG.
For example, a one-digit signal and its polarity corresponding to approximately the center of the expected change range for the signal added to t2, t2, etc. are set. This signal is applied directly or via the center value setting complement circuit H5 to the multiplexer M4, but when the signal is negative, the complement circuit H5 inputs 10 ^m+1 signals when the number of digits is m.
The multiplexer M4 adds the value set in the setter S or the complement to the adder circuit A1 depending on whether the signal is positive or negative. Further, a one-digit digital signal corresponding to the center value of the recording surface, that is, a signal indicating the numerical value 5 in the case of a recording surface as shown in FIG. 1, is applied to the terminal Q. Therefore, in the adder circuit A1, the above-mentioned calculation of (-Y+Z)/100 is performed. Since its output is applied to the adder circuit A2 along with the output signal of the multiplexer M1, if the value of the highest digit of the three-digit input signal is x, the adder circuit A2 performs the calculation of {x+(-Y+Z)}/100. will be held. The output signal of this adder circuit A2 is applied to the most significant digit of the digital-to-analog converter DA via a code conversion circuit B that converts a binary code into a decimal code. Moreover, since the output signals of multiplexers M2 and M3 are added to the lower digits of this converter, an analog signal corresponding to (X-Y+Z) is sent out from the converter and recorded by the recorder R.

As explained above, the device of the present invention does not cause discontinuities in the recording curve even when there is a change in the upper digits of a multi-digit digital signal to be recorded or when there is a change in polarity. , which can be recorded as one continuous curve. Therefore, it is easy to read, and the entire surface of the recording paper can be effectively used to perform high-precision recording.

[Brief explanation of the drawing]

Figure 1 shows an example of an analog recording curve.
FIG. 2 is a diagram showing the configuration of an apparatus according to the present invention, and FIG. 3 is a diagram showing the configuration of a specific embodiment of the present invention. In the figure, T is the input terminal for the digital signal to be recorded, P is the input terminal for the signal indicating its polarity, Q is the input terminal for the digital signal corresponding to the value at the center of the recording surface, and S is the center value setting device. , C is an arithmetic unit,
DA is a digital-to-analog converter, R is an analog recorder, H1, H2, H3 are input signal complement circuits, M1, M2, M3 are input signal multiplexers, H5 is a center value setting complement circuit, M4 is a center value The setting multiplexers A1 and A2 are adder circuits.

Claims (1)

[Claims] 1 An input signal complement circuit that sends out the value obtained by adding 10 ⁿ⁺¹ to the input digital signal of n digits when it is negative, and when the input digital signal is positive, it sends out the input digital signal, but it is negative. In this case, an input signal multiplexer that sends out the output digital signal of the complement circuit, a center value setter that sets the center value of the expected change range for the input digital signal, and a center value setter that sets the center value of the expected change range for the input digital signal, and m
This applies when the digital signal of the digit is negative.
A complement circuit for the center value setting signal that sends out the value obtained by adding 10 ^m+1 , and a complement circuit for the digital signal itself or the center value setting signal, respectively, depending on the positive or negative of the digital signal set in the center value setter. subtract the output digital signal of the center value setting signal multiplexer from the output digital signal of the input signal multiplexer, and generate a digital signal corresponding to the center value of the recording surface. It is characterized by comprising a digital arithmetic unit that performs addition, a digital-analog converter that converts the output signal of the digital arithmetic unit into an analog signal, and an analog recorder that records the output signal of the digital-analog converter. Analog recording device for digital signals.