JPS6022366Y2 - electronic desk calculator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electronic desk calculator, and particularly to an electronic desk calculator for teaching four arithmetic operations (hereinafter referred to as an educational calculator).

Generally, this type of calculator automatically generates the number of operations, the number of operands, and the result of the operation, presents the problem by displaying two of them, and does not display the remaining one as the correct answer, but instead requires the operator to answer the question. It is constructed in a format that compares the data and determines whether it is correct or incorrect.

FIG. 1 is a schematic diagram of the general configuration of a conventional educational calculator.

1 is a group of function keys that determine the types of four arithmetic operations;
2 is a function key encoder and memory circuit that includes one or more flip-flops; 3 is a problem creation circuit that creates four arithmetic problems according to the contents of 2; 4
5 is a register that stores the correct answer to the problem created in step 3 above; 6 is a display device including, for example, a fluorescent display; and 7 is a group of numerical keys for inputting answers. , 8 is a numeric key encoder including one or more flip-flops, 9 is a register for storing the answer entered using the numeric key 7, and 10 is a register for allowing the operator to check whether the answer is correct or incorrect when the answer input is completed. An operation key 11 is operated to determine the comparison time, and 11 is a pulse generation circuit including one or more flip-flops, which generates one pulse of one word time to set a comparison time when the key 10 is operated. AND gate 1 for creating a logical product of the output of the register 9 and the output of the pulse generating circuit 11;
3 is an AND gate that creates a logical product of the output of the register 5 and the output of the pulse generating circuit 11, and 14 is a comparison that compares the correct answer prepared in advance in the register 5 with the contents stored in the register 9. A circuit 15 is a flip-flop that stores the fact that there was a wrong answer when the comparison results do not match, that is, there is a wrong answer.

First, four desired rules are specified using function key 1.

For example, when a name key is designated, this is stored in the storage circuit 2.

Next, the question creation circuit 3 creates questions in line with the content of step 2.

In this case, division is specified, so for example, 18÷4=2
, for example, r
8÷4=Yo is stored as a problem in the register 4, which is also displayed on the display device 6 to present the problem to the operator.

On the other hand, the correct answer, here r2yo, is stored in the register 5 and waits for an answer from the operator.

Next, the operator presses the a key to 13. When input, this is stored in the register 9 and displayed on the display device 6.

When the operation key 10 is operated, the pulse generation circuit 11
generates a one-word time pulse, which conducts AND gates 12 and 13, and registers 5 and 9.
The contents of are compared by the comparison circuit 14.

Since the answer is incorrect here, the incorrect answer is displayed on the display device 6.

Next, when the operator inputs r2J and operates the key 10, this is the correct answer, so this correct answer is displayed as is on the display device 6.

Thereafter, calculation practice is performed by repeating the same operations.

By the way, in conventional educational calculators, division is limited to problems where the quotient is an integer.

However, for problems where the quotient is not an integer, it would be more effective for calculation practice if the remainder could be displayed (or inputted by the operator).

Furthermore, if the quotient is limited to problems where the quotient is an integer, the number of problems is extremely limited, but if the remainder can be displayed, this restriction is not imposed and the number of problems becomes abundant.

The purpose of the present invention is to provide an educational calculator that requires the remainder of division as an answer and determines whether it is correct or incorrect, taking the above points into consideration.

The present invention provides an electronic desktop calculator having a novel circuit that can quickly determine whether an answer is correct or incorrect using the same hardware circuit, regardless of whether the division has a remainder or not. There is a particular thing.

The present invention will be explained below using the drawings.

FIG. 2 is a block diagram showing an embodiment of the present invention.

1 is a group of function keys that determine the types of four arithmetic operations;
2 is a function key encoder and memory circuit;
3 is a problem creation circuit; 4 is a register that stores the problem created by the problem creation circuit 3; and 5-a stores the correct answer (in the case of division, only the quotient) of the problem created by the problem creation circuit 3. A register, 5-b, is a register for storing the remainder of division; 6, a display device including, for example, a fluorescent display; 7, a group of numerical keys for inputting answers; 8, an encoder and storage circuit for the numerical keys; 9-a; 9 is a register that stores the answer from the operator (in the case of division, only the quotient), 9 is a register that stores the remainder answer from the operator, and 10 is a register that the operator inputs to know whether the answer is correct or incorrect. Operation key 11 is a pulse generation circuit including one or more flip-flops that generates one pulse of 2 word time when the operation key 10 is operated; 14 is a register 5-a and a register 5-;
a comparator that compares the contents stored in register 9-b with the contents stored in register 9-a and register 9-b;
Reference numeral 15 denotes a flip-flop that stores the fact that there is a wrong answer when the comparison results do not match, that is, there is a wrong answer.

Further, 16 is a word pulse generation circuit including one or more flip-flops that repeats inversion at the cycle of one word time, 17 is an inverter that creates a reciprocity of the output pulses of the pulse generation circuit 16, and 18 is the output of the register 5-a. and the output of the pulse generating circuit 16; 19 is an AND gate that performs the AND of the output of the register 5-b, the output of the inverter 17, and the output of the flip-flop 22; 20 is the output of the AND gate 18; This is an OR gate that creates a logical sum between the output of the AND gate 19 and the output of the AND gate 19.

Furthermore, 21 is a remainder input instruction key operated by the operator to instruct the calculator to input a remainder, 22 is a flip-flop that remembers that the remainder input instruction key 21 has been operated, and 23 is an output of the flip-flop 22. 24 is an AND gate that creates a logical product between the output of the memory circuit 8 and the output of the flip-flop 22; 25 is an AND gate that creates a logical product between the output of the memory circuit 8 and the output of the inverter 23; 26 is an AND gate that creates a logical product of the output of the memory circuit 8 and the output of the inverter 23 27 is an AND gate that creates a logical AND between the output of register 9-a and the output of pulse generator 16; 28 is an inverter that creates the output of register 9-b and the inverter 26;
29 is an OR gate that creates a logical sum between the output of the AND gate 27 and the output of the AND gate 28;
Reference numeral 2 designates an AND gate that creates a logical product between the output of the pulse generating circuit 11 and the output of the OR gate 29, and 13 represents an AND gate that creates a logical product between the output of the pulse generating circuit 11 and the output of the OR gate 20.

Assuming that, by operating the key on the day of function key group 1, the problem creation circuit 3 calculates, for example, 17÷3=2 remainder L, for example, 17÷3=Y is stored as a problem in the register 4, and this is also displayed on the display device 6 to present questions.

The quotient 12J is stored in the register 5-a, and the remainder rIJ is stored in the register 5-b, awaiting an answer from the operator.

At this time, the remaining keys 21 have not been operated yet, so
Flip-flop 22 has been reset, so AND gate 24 is non-conducting.

On the other hand, one input of AND gate 25 is connected to the output of flip-flop 22 through inverter 23, so it is in a conductive state.

Then, when the operator inputs r2J using the ■ key, this is stored in the register 9-a through the AND gate 25 and displayed on the display device 6 at the same time.

Next, when the operator operates the remainder key 21, the flip-flop 22 is set and the AND gates 24 and 25 are set.
The conductive and non-conductive states of are reversed, and the AND gate 24 becomes conductive and the AND gate 25 becomes non-conductive.

The output of the flip-flop 22 is also connected to the display device 6, so for example 10. A symbol such as
Of course, this symbol for instructing the operator to input the remainder may be any symbol as long as it can be realized by the display device used.

Then, when the operator inputs rl and J using the field keys,
This is stored in the register 9-b through the AND gate 24 and displayed on the display device 6 at the same time.

In this way, the contents entered before operating the remainder key 21 are stored in the register 9-a as the answer to the quotient, and are stored in the remainder key 2.
The contents assigned after operating 1 are stored in the registers 9-b as the remainder answers.

By the way, since the pulse generating circuit 16 generates a pulse with a pulse width of one word time, the AND gates 18,1
9, 27, and 28 are inverted in their conductive and non-conductive states every word time.

However, AND gates 12 and 13 remain non-conductive unless ANS key 10 is operated, so register 5
-a, 5-b and 9-a, 9-b are stored in the comparator 14.
It will not be sent to

Then, when the operator next operates the ANS key 10, the pulse generating circuit 11 generates one pulse of 2 word time, and the AND gates 12 and 13 become conductive for the 2 word time.

The timing of the outputs of the pulse generating circuits 11 and 16 is illustrated in FIG. 3.

At time A in FIG. 3, AND gates 18, 27 and 1
2.13 is conductive, so registers 5-al and 9-a
The contents, ie, the quotient part, are sent to the comparator 14 through OR gates 20 and 29, respectively, and compared.

Also, at time B in FIG.
- The contents of b, that is, the remainder, are each OR gate 20
and 29 to the comparator 14 for comparison.

FIG. 4 is a diagram showing an example of the key operation and the display state.

Here, if the answer input by the operator is correct (d)
The display for (e) does not change, but of course it is possible to display a symbol to indicate the correct answer or make a sound to make it more clear that the answer is correct. It is.

Further, in FIG. 2, AND gates 19 and 28 are in a non-conducting state unless the remaining key 21 is operated.

Therefore, after the operator inputs the quotient, the operator does not operate any remaining keys.
That is, if the ANS key is operated immediately without inputting the remainder, the remainder information stored in registers 5-b and 9-b is not sent to the comparator, and only the quotient is judged as correct or incorrect.

As explained above, according to the educational calculator of the present invention, in division, it is possible to judge whether only the quotient is correct or incorrect, but also both the quotient and the remainder, so it is possible to further increase the educational effect of calculation practice. becomes.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the general configuration of a conventional electronic desk calculator for educational purposes, Figure 2 is a block diagram of an embodiment of the present invention, and Figure 3 shows the ANS key in Figure 2. A diagram showing the timing of outputs 11 and 16 when operated,
FIG. 4 is a display example in the embodiment of FIG. 2. In the figure, 1...Function key, 2°...Encoder and memory circuit, 3...
・Question creation circuit, 4t 5-at 5-by 9
-at 9-b-...Register, 6...
・Display device, 7...Numeric keys, 10...
- Operation keys, 11...Pulse generation circuit, 12.
13, 18, 19, 24, 25, 27, 28...
・And gate, 14... Comparator, 15...
...Flip-flop, 16...Word pulse generator, 17.23.26...Inverter,
20.29...Orgate, 21...
Remainder input instruction key 22...Flip-flop.

Claims (1)

[Scope of utility model registration request] In an electronic desktop calculator that has a division problem generation function, a function to create correct answer data for the generated problem, and a function to judge the correctness of the operator's answer data input from the outside, the correct answer quotient of the correct answer data for the division problem is used. The first and second sections each store the data and the remaining correct answer data separately.
and third and fourth memory circuits that separately store answer quotient data and answer remainder data of the answer data input by the operator, and when an instruction signal instructing input of the remainder data is not generated. a first gate circuit that sets data input by an operator in the third memory circuit, and sets data input by the operator in the fourth memory circuit when the instruction signal is generated; , a set of the output of the first memory circuit and the output of the third memory circuit and a set of the output of the second memory circuit and the output of the fourth memory circuit are selected separately and alternately. a second gate circuit that receives the output of the second gate circuit and inputs the output of the second gate circuit to the comparator in response to answer completion data input by the operator. An electronic desktop calculator comprising: a gate circuit; and a circuit that creates a signal indicating a wrong answer when the correct answer data and the answer data do not match based on the comparison result by the comparator.