SU1727119A1 - Device for information input - Google Patents

Abstract

The invention relates to the field of computer technology and can be used to enter information into a computer by persons who have lost their sight. The purpose of the invention is to increase the reliability of the input information. The device contains a keyboard 1, coding blocks 4, 6, register 5, multiplexer 7, bounce suppressor unit of contacts 8, trigger 9, element 10, counter 11, pulse generator 12, element AND NOT 13 The device contains a keyboard consisting of eight keys for entering information and an Enter key, which enables or blocks the entry of information into the computer. 4 il.

Description

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The invention relates to computing and can be used to enter information into computers mainly by persons who have lost their sight.

A data entry device is known that reduces operator errors and increases productivity when data is entered into a computer by using only ten keys to enter. The disadvantage of this device is the absence of fixations of control keys, a switch, keys and function keys for selecting operations, which makes it difficult for people who have lost their sight to use it due to the possibility of erroneous input of information into a computer.

The closest in technical essence to the proposed device is selected as a prototype device

for information input, containing a keyboard, made in the form of switching elements, including moving normally closed and normally open contacts, multiplexer generator (pulses element And, counter, elements NOT, AND / 1I, RS-flip-flop.

This device has the following disadvantages:

the number of code parcels corresponds to the number of switching elements and keys;

There is no keyboard coding unit in the device, i.e. a complete code pattern is not generated for entry into the computer;

There is a possibility of erroneous information input by accidentally pressing a key.

The aim of the invention is to increase the reliability of the input information.

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This goal is achieved by the fact that a device for entering information containing a keyboard, a multiplexer, a pulse generator, element-I, a counter, an RS flip-flop, whose direct output is connected to the first input of the element I, to the second output of which is connected a pulse generator, the output the element And connected; on the counting input of the counter, the outputs of which are connected to the address inputs of the multiplexer, the keyboard contains eight keys and the Enter key and the contact bounce block is entered into it, the first coding block, the second block the code element is NAND, and eight keys are connected to the first coding unit, the outputs of which are connected to the information inputs of the register, the outputs of which are connected to the seven information inputs of the multiplexer and the inputs of the second coding unit, the output of which is connected to the eighth information input of the multiplexer, and the output of the multiplexer is output of the device, the Enter key being connected through the bounce suppressor unit to the S input of the RS flip-flop, and the output of the AND element is also connected to the synchronous input of the register, the counting outputs and connected to the AND-NO element whose output is connected to the R-input of RS-flip-flop and the reset inputs of the register and counter.

FIG. 1 is a block diagram of an information input device; in fig. 2 shows one of the possible options for implementing a keyboard coding unit. Tab. 1 is a table of correspondence of the COY-7 codes to the keys of the keyboard, and a tabl; 2 - table formation codes.

The device contains a keyboard 1, consisting of eight information keys 2 and the Enter control key. 3, the first coding block 4, register 5, the second coding block 6, multiplexer 7, bounce suppressor block 8, trigger 9, elements (counting resolution circuit) 10, counter 11, pulse generator 12, AND-NOT element 13. Output the device is the output of the multiplexer 7. The device for entering information operates as follows.

The character code is dialed using eight information keys 2, with the separate keys for frequently used Space and Face characters. When a certain key combination 2 is pressed from the output of the coding block 4, the code of the typed character is input to the register 5;

2. Writing into the register 5 of the character code is not made, since the signal from the AND 10 element does not arrive at the input of the recording resolution. When the Enter 3 key is pressed, the bounce suppression unit 8 generates a negative pulse at the S input of trigger 9, which sets logical 1 at its direct output. Logical 1 from the direct output of trigger 9 will allow the clock pulses from the generator 12 to pass through And 10 to The input of binary counter 11 and the input of register register 5 enable. At the same time, the code of the typed character is written to register 5. From the register output

5, the symbol code goes to seven information inputs of multiplexer 7 and to coding unit 6. Block 6 generates an additional parity (or oddness) bit and outputs it to the eighth information input of multiplexer 7. From the outputs of counter 11, pulses arrive at the address inputs of multiplexer 7 and in accordance with this, the output signal is generated at the output of the multiplexer

7, i.e. at the output of the device. When the counter 11 is filled, logical 1 will be formed at its outputs, the output signal will be formed at the output of the multiplexer 7 and at the output of the element

AND-NO 13 a logical O will be generated, which will install the trigger 9 on the R-input to the initial state, i.e. on its direct output a logical O will be generated, and also will reset the register 5 and

counter 11. The input device will return to its original state.

As can be seen from the table. 1, 2 to enter, for example, the character A, you must press the B1 and B6 keys, to enter the Space character the B7 key, to enter the Zaboy character — either all the B1-B6 keys or the B8 key.

Fig. 2 shows a variant of constructing a coding block 4 with eight keys connected.

 The device makes it possible to reduce the likelihood of erroneous input of information in a computer to persons who have lost their sight, significantly reduces the time spent on their training. The presence of only the virgins of the key makes it possible to fix the fingers on certain keys and not to move them during work.

In combination with specialized information output devices, the device expands the range of users of computer technology.

Claims (1)

Formula of the Invention An information input device comprising a keyboard, a multiplexer, a pulse generator, an element, a counter, a trigger, the direct output of which is connected to the first input of an element, the second input of which is connected to the output of a pulse generator, the output of an element I, is connected to the counting input of the counter, the outputs of which are connected to the address inputs of the multiplexer, which is due to the fact that, in order to increase the reliability of the entered information, the first and second coding units, a register, a suppression unit contact bounce, the element IS-NOT, and the information outputs of the keyboard are connected to the inputs of the first coding unit, the outputs of which are ГГ &1; The keys are connected to the information inputs of the register whose sync input is connected to the output of the element. 14. The register outputs are connected to the inputs of the second coding unit, the counter outputs are connected to the inputs of the NAND element, the output of which is connected to the reset inputs of the counter, register and trigger, whose single input is connected to the output of the bounce suppressor 0 pins, the input of which is connected to the keyboard input output, the register outputs and the output of the second coding unit are connected to the information inputs of the multiplexer, the output of which is the output 5 devices. FIG. 2 J Fig.Z Fy