JPS6030949B2 - electronic desk calculator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic desk calculator, and particularly to a desk calculator for the purpose of teaching four arithmetic operations.

As a result, electronic desktop calculators are available with various functions, and the users of these calculators are wide-ranging. Among these, desktop calculators for self-study have been developed especially for younger age groups (mainly elementary school students), and are provided mainly for the purpose of learning the four arithmetic operations. However, the first requirement for a computer aimed at such a younger age group is that it be small and inexpensive so that it can be used in general households, but beyond that, it is required to: The fact that it is easy to operate and can be used by oneself easily leads to an increase in the desire to learn immediately.
An object of the present invention is to provide an electronic desktop calculator for learning four arithmetic operations that can be used with as simple operation as possible.

According to the present invention, a group of numerical keys each capable of specifying at least a numeric value from 0 to 9, a group of function keys capable of specifying each of at least four arithmetic operations, and a group of numerical keys and a group of function keys each provided with, Each includes a key detection circuit that detects when a key is pressed and outputs a signal corresponding to the pressed key, and a digital display device, and displays an operand, an operand, an operation result, and an operation symbol. Among the mathematical expressions to be entered, two types of numbers and operation symbols are displayed as questions, and the remaining numbers that are not displayed are considered as correct answers and compared with the numerical values to be input using the numerical key group to display the correctness. In an electronic desktop calculator, when a calculation designation is detected by the key detection circuit on the function key group side, a problem containing the specified calculation symbol is created using randomly extracted numerical values, and a correct answer to the problem is created. By providing a question creation circuit, it is possible to obtain an electronic desktop calculator that is as easy to operate as possible for the user. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, in which a group of numerical keys 1 specifying each numerical value from 0 to 9 and four arithmetic operations, namely addition (
Function key group 2 specifies operations such as subtraction (1 in the figure), subtraction (1 in the figure), multiplication (× in the figure), and division (÷ in the figure), and one in numeric key group 1. Numerical key detection circuit 3 detects that a key is pressed and outputs a signal indicating the numerical value corresponding to this key, and detects that one key in function key group 2 is pressed and A function key detection circuit 4 outputs a signal indicating the corresponding operation, and a set of operation numbers, operands, and operation result numbers are created using the signals from this detection circuit 4, and these three kinds of numbers are displayed as a problem. A problem creation unit 5 that classifies and outputs display data to be displayed (including operation symbols) and comparison data to be an answer, and a comparison data from this problem creation unit 5 and numerical data from the numerical key detection circuit 3. It is comprised of a comparing section 6 that compares and outputs display data indicating the presence or absence of a match, and a digital display device 7 such as a full-length optical display tube.

Note that each of the key detection circuits 3 and 4 includes one or more flip-flops. In operation, when the user presses any one of the function keys 2 in accordance with the desired operation, the function key detection circuit 4 detects this and outputs a signal indicating the pressed operation.

The problem creation unit 5 includes a counter COUT that generates random numbers and a counter COU via an AND gate GI.
For example, when a key specifying addition is pressed in function key group 2, A+B=C(A is the operand, B is the number of operations, and C is the number of operation results. , and a problem display register PR that stores A+B= from the arithmetic unit ARU as data to be displayed as a problem, and operates as follows.

That is, first, the counter COUT always counts some number, and its contents are constantly changing.

Here, a signal for pressing an addition key in the function key group 2 is encoded and stored in the function key detection circuit 4, and a signal indicating addition is output. At the same time, the contents of the counter COUT are stored in the data register DR through the gate GI (the number of digits is arbitrary), and the arithmetic unit ARU is also activated by a signal indicating addition from the function key detection circuit 4. The content of is divided into two numerical data, A and B, and an addition operation of A+B is performed to calculate numerical data C. Subsequently, the arithmetic unit ARU sends the data A+B= to the problem display register P.
Numerical data R and C are sent to the comparator 6, and the digital display device 7 displays each A+B using the question display register PR, presents the question to the user, and inputs the answer from the numeric key group 1. have Here, if the presented problem is difficult to answer, the user can press the addition key in the function key group 2 again, and the problem creation section 5 will create a new problem by the above-mentioned operation. create. And this new problem is the digital display device 7.
is displayed, and the numerical data of the correct answer is sent to the comparison section 6.
You will have to wait for the answer to be entered. On the other hand, the comparator 6 is arithmetic unit A.
A correct answer register CR that stores the numerical data C from RU as the correct answer, a comparator circuit CC that compares the data indicating the answer inputted by the numerical key group 1 with the data from the correct answer register CR, and the numerical key group 1. It includes an answer register SR that stores the input answer, and an error display register ER that stores data for displaying an error when the input answer is a wrong answer, and operates as follows. .

That is, after the question is displayed on the display device 7, when the user inputs only one digit of the answer from the numeric key group 1, this signal is encoded and stored in the numeric key detection circuit 3, and outside of this data is stored in the answer register. The data is stored in SR and is compared digit by digit with the data from the correct register CR that has already been stored in the comparator circuit CC.

If a match is detected, the error indication register ER is not set, which causes the answer register S to be sent via gate G2.
The stored contents of R are sent as they are to the display device 7 and displayed, informing the user that the answer is correct. If they do not match, it is a wrong answer, and the error display register ER is set by the output of the comparator circuit CC, and the answer display is cut off by the gate G3, indicating that it is a wrong answer.
For example, the symbol E is displayed. As above,
The user only needs to hit the keys when specifying the desired calculation and when inputting the answer.

FIG. 2 is a flowchart showing the transition of the operating state of each part shown in FIG. 1, including the user's operations, and the double-framed portion represents the user's operations.

First, the state m is waiting for the calculation type of the problem to be specified, and the display device 7 is in a clear state or displaying the previous problem and answer.

In state m2, the user presses function key group 2 to add, subtract,
When one of the keys for addition and division (addition will be explained below in the same way as described above) is pressed, the function key detection circuit 4 is set to output a signal indicating addition in state m3. In state blood, the question creation unit 5 creates an addition problem and correct answer based on the signal from the function key detection circuit 4, and when the question is displayed on the display device 7 in state rudder, the answer from numeric key group 1 is entered in state m6. Waiting for input. In this manner, the present invention is configured such that when an operation is designated in state m2, the process automatically proceeds from state m3 to m4 to wind to m6. Subsequently, in state m7, when an answer is input one digit at a time from numerical key group 1 by the user's operation, in state m8, the numerical key detection circuit is set to output a signal indicating the input numerical value.

In the state analogy, the comparator 6 compares the correct answer input from the question creator 5 and the answer from the numerical key detection circuit digit by digit, and if they match, the state is m. Check to see if all digits of the answer have been entered, and if all digits have not been entered yet, return to the state and wait for the next answer to be entered. If all digits have been input, the process returns to state m and waits for the next calculation to be specified. Also,
If they do not match, the state m, . Then, the display device 7 displays an error message, and the user returns to the embarrassing state and waits for a new answer to be input. FIG. 3 is a diagram showing the relationship between key operations and the display at that time in the embodiment of FIG. 1.

In this figure, when the user presses the function key 10 for specifying addition in operation OP, a problem such as 203 = is displayed, and when the user presses numeric key 5 in operation OP2 after seeing this display, Since there is a match in the comparison section, 23 =
5 is displayed to indicate that the answer is correct,
Waits for the next operation specification.

Next, when you press the function key that specifies subtraction in operation OP3, a problem such as 6 - 4 = is displayed, and operation OP3 is pressed.
If you press number key 1 at 4, there will be no match, so 6-4
=B is displayed to indicate that the answer is incorrect, and the user waits for another answer to be input. After this, if the numerical key 2 is pressed in operation OP5, 6-4=2 is displayed as the correct answer.
Next, when the function key × that specifies multiplication is pressed in operation OP6, a problem such as 5×7= is displayed, and the user must first press numeric key 3 for the first digit answer in operation OP7. Since there is a match for the 10th place, it is 5×7.
Display = 3 and wait for the next digit, that is, the answer of the 1's digit to be input. Then, if numeric key 5 is pressed in operation OP8, this will also match, so 5 x 7 = 35
is displayed to indicate that the answer is correct, and the process waits for the next calculation to be specified. Thereafter, the questions and correctness of the four arithmetic operations can be displayed in the same manner. It should be noted that the above-mentioned problem is just an example, and it goes without saying that the numerical values in question are randomly created and displayed depending on each operation specification. Also,
In this embodiment, we have explained the case where calculations are specified using the function keys every interval, but it is also possible to create several problems that include the same type of calculation symbols with one function key operation. In addition, we have explained the case where the correct answer is the number of operation results, but in this case too, the correct answer is the number of operations, for example 30 = 7, or the correct answer is the operand, for example 13 =
7 is also possible.

As explained above, the desk calculator according to the present invention can be used with two key operations: specifying an operation and inputting an answer, so it can be easily used even by children in the lower grades of elementary school, and its configuration is different from that of conventional electronic desk calculators. Since there is no need to deviate from the range, it can be made small and inexpensive, and can be easily installed and used in ordinary homes. Furthermore, pressing a function key always creates a new question, so if the displayed question is difficult to answer, you can skip the previous question by pressing the function key. You can move on to the next problem. Therefore, you will not feel troubled by difficult questions to answer,
You can easily enjoy calculations without losing your motivation to learn. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a flowchart showing the transition of operations when using the embodiment of FIG. The figure is a diagram showing the relationship between key operations and displays.

The reference numbers in the drawings are as follows: 1: Numeric key group, 2: Function key group, 3: Numeric key detection circuit, 4: Machine building key detection circuit, 5: Question creation section, 6: Comparison section, 7: Display equipment, GI,
G2, G3: Gate, COUT: Force counter, DR: Data register, ARU: Arithmetic unit, PR: Problem register, C
R: Correct answer register, CC: Comparison circuit, ER: Error display register, SR: Answer register. Figure 'Figure 2 Figure 3

Claims (1)

[Claims] 1 A group of numerical keys each capable of specifying at least a numeric value from 0 to 9, a group of function keys capable of specifying each of at least four arithmetic operations, and a group of numerical keys and a group of function keys each provided with a key that can be pressed. It includes a key detection circuit that detects the pressed key and outputs a signal corresponding to the pressed key, and a digital display device. An electronic desktop calculator configured to display two types of numbers and operation symbols as questions, and display the remaining numbers that are not displayed as correct answers compared with the numerical values to be input using the numerical key group. When the key detection circuit on the function key group side detects the designation of an operation, in response to the detection, a problem containing the specified operation symbol is created using randomly extracted numerical values, and the correct answer to the problem is determined. 1. An electronic desktop calculator, comprising a problem creation circuit, and a new problem is created each time a key signal is input based on the function key operation.