JP2555512B2 - Electronic counter scaling method - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to conversion of gear ratios between gears, dozen conversion of product numbers, conversion between units such as length, weight or area, and conversion among various other numerical values. The present invention relates to a scaling method for an electronic counter that displays a value.

[0002]

2. Description of the Related Art Numerical values obtained by computing a count value counted by a counter of an electronic counter or a count value preset (preset) in the counter by a predetermined constant (scaling value) and replacing it with a converted value. Is displayed, and this conversion process is called scaling or prescale.

In this scaling processing method, a scaling value is set in the arithmetic unit as a real number (for example, a numerical value after the decimal point is clearly specified as 2.145), and the scaling value is set in micro. It is generally performed that a computer performs arithmetic processing with the count value of the counter to convert it into a numerical value and display it. That is, the count value C of the counting section is subjected to C × K calculation processing with the scaling value K set in the calculation section, and the numerical value A of the calculation result is displayed on the display section as a converted value after scaling. .

For example, when the scaling value for one unit of a certain count value is 2.145 and the count value counted by the counter is 5, the calculator calculates 5 × 2.145 to obtain 5 × 2.145 = A method of displaying the scaling result by displaying 10 of the calculation result value on the display unit from the result of 10.725 has been adopted. The relationship between this count value and the scaling value is determined by the unit to be converted,
For example, in terms of length unit conversion, various conditions are set such as conversion from centimeters to inches, conversion from meters to yards, or vice versa.

[0005]

However, when the scaling value cannot be replaced with an accurate real number, it is necessary to set the scaling value with an approximate real number as high as possible within the range that can be set in the microcomputer. Has been done. For example, when converting 1 dozen, the scaling value should be set to 1/12, but 1/12
= 0.0833333333 ... Because 1/12 cannot be replaced with an exact real number, when setting a scaling value for a microcomputer, it is usually rounded down to 9 digits after the decimal point and rounded off to a real value of 0.08333333. Was there.

Therefore, in the arithmetic unit, when the count value is 1, 1 × 0.08333333 = 0.08333333 When the count value is 2, 2 × 0.08333333 = 0.166666666 When the count value is 3, 3 × 0.08333333 = 0.24999999
However, if the count value reaches 12, then 12 ×
0.08333333 = 0.99999996 is calculated and originally an integer 1
However, there is a problem in that if the value is displayed as it is, it is displayed as an incorrect count, and the converted value cannot be accurately displayed as an integer.

The present invention is intended to solve the above problems. When scaling or prescaling the count value (including preset) of an electronic counter, the scaling value in the arithmetic unit is set as a fraction and the arithmetic result is checked. An electronic device that makes it possible to accurately display the integer conversion result of the scaling result during one cycle of the count input pulse of the counter by performing range determination by the unit and performing integer correction by the correction unit based on the determination result. It is intended to provide a scaling method for a counter.

[0008]

In order to achieve the above object, the invention is to provide a count value C counted by a counter of an electronic counter.
Is a scaling method of an electronic counter in which a predetermined scaling value set in the calculation unit is calculated, and the calculation result is numerically corrected through the correction unit and displayed on the display unit. C × SL set by the fraction SL / Sd of the frequency division value Sd and the multiplication value SL within 4 digits
/ Sd is calculated, the check section determines the range of the numerical portion of 8 digits after the decimal point of the above calculation result, and the correction section is based on the determination result of the above check section. Only within the range of ~ 0.99999999, add 1 to the operation result in the operation unit and display the integer part of the value after the decimal point is corrected to 0 on the display unit.
Only when the value is within the range of complement of 0.99999999, subtract 1 from the operation result of the operation unit and display the integer part of the numerical value after the decimal point is corrected to 0 on the display unit. This is a scaling method for an electronic counter, characterized in that the integer part of the numerical value of 8 digits after the decimal point of the calculation result of the calculation and the subtraction calculation is converted into a numerical value as it is and displayed on the display section.

[0009]

Therefore, in the scaling method of the present invention,
The scaling value of the arithmetic unit is set by the fraction SL / Sd of the frequency division value Sd within 4 digits and the multiplication value SL within 4 digits,
The check part makes a numeric judgment with 8 digits after the decimal point, and when the addition operation is performed, the decimal point of the operation result is from 0.99990000 to 0.99.
If it is within the range of 999999, the correction unit adds 1 to the calculation result and corrects the decimal part to 0 to display the integer part.

Further, in the subtraction operation, when the decimal point of the operation result is within the range of the complement of 0.99990000 to 0.99999999, the correction unit subtracts 1 from the operation result and corrects the decimal point to 0. Display the integer part. Further, when the 8 digits after the decimal point of the arithmetic result of the arithmetic section does not fall within the above range, no correction is made and the integer portion of the numerical value of 8 digits after the decimal point of the arithmetic result is displayed as it is. Therefore, the count value of the electronic counter is integer-corrected during one cycle of the indivisible scaling value, and the subsequent scaling is repeated, so that an erroneous count of the arithmetic processing in the arithmetic unit is eliminated.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a scaling method of the present invention will be described with reference to a block diagram showing a case of addition operation. FIG. 1 is a block diagram showing a scaling unit of an electronic counter, in which a count value C is input to a counting unit c. Further, in the arithmetic unit e,
The scaling value is set by the fraction SL / Sd, which is the division value Sd within 4 digits and the multiplication value SL within 4 digits, and the scaling value SL / Sd is calculated up to 8 digits after the decimal point by calculation. By setting (K≈SL / Sd), a calculation process of adding the real number K every time the count value C increases by 1 is performed. (In the case of subtraction, the calculation process of subtracting the real number K is performed each time the count value C increases by 1.)

The result of this operation is range-determined by the check unit t within a range of eight digits below the decimal point. The condition of the range judgment in the check part t is that the numerical range is set to 0.99990000 to 0.99999999 in the case of addition operation, and the complement of this range (0.00010000 to 0.00000001) in the case of subtraction operation.
Is set to. Next, the above calculation result is checked by the check unit t.
When it is determined that the numerical value with 8 digits after the decimal point is within the above range, the correction unit h adds 1 to the calculation result and the decimal point is set to 0 to correct the integer, and the integer value is displayed on the display unit d. To be done.

When the check unit determines that the eight digits below the decimal point of the calculation result are out of the range, the calculation result is displayed on the display unit d as it is without being corrected by the correction unit h. The circuit is set up. In addition, in the case of the subtraction operation, when the check unit determines that the numerical value with 8 digits after the decimal point of the operation result is within the range of complement (0.00010000 to 0.00000001), the correction unit h subtracts 1 from the operation result. The decimal point is set to 0 and corrected to an integer and displayed on the display section d.

Therefore, the count value C is calculated by the calculation unit e, and the calculation result passes through the check unit t to determine whether integer correction is necessary. Only when correction is necessary, the correction unit h performs integer correction. Is displayed on the display unit d, and when the integer correction is not necessary, the calculation result is displayed on the display unit d as it is.

At this time, the scaling value fraction SL / Sd
The error E (E = SL / Sd−K) between the calculated real number K and the calculated real number K is the maximum decimal number (0.000000009999 ...) With 9 digits after the decimal point, but this maximum error is added in relation to the count value C and converted. If the maximum accumulation error that requires carry to the value A (the digit is increased from the number after the decimal point to the integer) is 0.000000009999 ... × because the minimum fraction of the scaling value SL / Sd can be assumed to be 1/9999. By calculating 9999 = 0.00009999 ..., it is specified that the maximum accumulation error is a numerical value less than 0.0001. Therefore, it can be specified from the calculation of 1-0.0001 = 0.9999 that the numerical part below the decimal point that requires carry of an indivisible fraction including the maximum accumulation error is 0.9999 or more.

Further, the minimum accumulation error that needs to be carried due to the error between the scaling value SL / Sd and the calculated value K is the ninth digit after the decimal point, so 1-0.000000001 = 0.999999999.
From the calculation of, when the number of significant digits is 8 digits after the decimal point, the minimum accumulation error can be specified as 0.99999999. Therefore,
The range of the numerical part below the decimal point that requires a carry when a count input is entered is specified as 0.9999 to 0.99999999. At this time, since the scaling value SL / Sd is set by the fraction of the frequency division value Sd within 4 digits and the multiplication value SL within 4 digits, the minimum fraction 1/9999 of the scaling value is a value up to 8 digits after the decimal point. When the calculated value K is set with, K =
It is 0.00010001, and the range that requires 1-K conversion display is
1-0.00010001 = 0.99989999, and the above judgment range (0.
9999 to 0.99999999), the calculation result by the real number K can be displayed as an effective value as it is.

Next, regarding the actual display state when the count value is scaled by the scaling method of the present invention,
A case will be described as an example where a dozen conversion is performed with 1 as the unit. First, the scaling values in the arithmetic unit e of the electronic counter are set to SL = 1 and Sd = 12 and set in fractions. Next, the calculated real number K is calculated from the scaling value (1/12), and K = 0.08333333 is added to the count value C for calculation. At this time, when the count value C is C = 11, the calculation result is 0.91666663, which is outside the setting range of the check unit t, and therefore the calculation result is displayed as it is on the display unit. Next, when the count is incremented by 1 and counted to C = 12, the calculation result of the calculation unit e becomes 0.99999996, which is included in the determination range of the check unit, 1 is added, and the value after the decimal point is set to 0.
And the value of 1.00000000 is displayed on the display section d.

Further, when the count is increased by 1 and C = 13,
K = 0.08333333 is calculated for the corrected calculation result, and the calculation result becomes 1.08333333. When the check section determines the range of 8 digits after the decimal point, the value of 1.08333333 is displayed on the display section d as it is out of range. Is displayed. In this way, the result of the arithmetic processing of the count value C along the fraction 1/12 set by the scaling value is integer-corrected for every dozen without error, and the accurate conversion result is automatically displayed.

[0019]

As described above, according to the present invention, the count value C counted by the counting section of the electronic counter is calculated by the predetermined scaling value set in the calculation section, and the calculation result is converted into a numerical value through the correction section. A method of scaling an electronic counter which is corrected and displayed on a display unit, wherein the arithmetic unit sets a scaling value by a fraction SL / Sd of a frequency division value Sd within 4 digits and a multiplication value SL within 4 digits and C × SL / Sd is calculated,
The check section determines the range of the numerical portion of 8 digits after the decimal point of the above calculation result, and the correction section calculates 8 digits after the decimal point based on the determination result of the above check section.
Only when the value is within the range of 0.99990000 to 0.99999999, add 1 to the operation result in the operation unit and display the value after the decimal point is corrected to 0 on the display unit. Only when the value is within the range of complement, subtract 1 from the operation result of the operation unit and display the numerical value after the decimal point is corrected to 0 on the display unit. This is a scaling method for electronic counters, which is characterized in that the integer part of the resulting 8 digits after the decimal point is displayed as it is on the display part, so the scaling value can be set by a fraction. However, even if it is possible to set a scaling value with a fraction that cannot be divided even if it is set with a real number, and even if it is a conversion-related numerical value that will cause an erroneous count with the real number setting, It is possible to accurately display an integer in relation to the fraction of the determined scaling value SL / Sd.

Furthermore, the count value C is set to 1 by the judgment of the check unit during one cycle time (for example, 0.2 ms) of the count input pulse.
Since the integer processing for each cycle is performed and the arithmetic processing is performed, the conversion processing can be performed accurately and at high speed.

[Brief description of drawings]

FIG. 1 is a block diagram in the case of an addition operation for explaining a scaling method of an electronic counter of the present invention.

[Explanation of symbols]

 c counting unit e computing unit t checking unit h correcting unit d display unit

Claims (1)

(57) [Claims] 1. An electronic device in which a count value C counted by a counter of an electronic counter is calculated by a predetermined scaling value set in a calculator, and the calculation result is numerically corrected by a corrector and displayed on a display. A counter scaling method,
In the calculation unit, the scaling value is divided into 4 digits and the divided value Sd and 4
Set by fraction SL / Sd with multiplication value SL within digits and set C ×
The calculation of SL / Sd is performed, the check unit determines the range of the numerical portion of 8 digits after the decimal point of the above calculation result, and the correction unit determines the range of 8 digits after the decimal point based on the determination result of the above check unit. Only when the value is within the range of 0.99990000 to 0.99999999, add 1 to the operation result in the operation unit and display the integer part of the numerical value after the decimal point is corrected to 0 on the display unit.
Only when the value is within the complement range of 0000 to 0.99999999, subtract 1 from the operation result of the operation unit and display the integer part of the numerical value after the decimal point is corrected to 0 on the display unit. A scaling method for an electronic counter, characterized in that the integer part of the numerical value of 8 digits after the decimal point of the calculation result of the addition operation and the subtraction operation is displayed as it is on the display section.