SU1057937A1 - Information input device - Google Patents

Abstract

A DEVICE FOR ENTERING INFORMATION containing a keyboard, a decoder, a pulse generator, the first counter, a prohibition element, the output of the pulse generator is connected to the information input of the prohibition element, the output of which is connected to the counter input of the first counter, characterized in that in order to increase the accuracy of the input information , the inverters, the first and second And elements, the first and second triggers, the second meter, the delay element and the switch, whose outputs are the outputs of the parallel device code, the outputs The first counter is connected to the inputs of the inverters, the outputs of which are connected to the information inputs of the switch and the inputs of the decoder, the first output of which is connected to the setup input of the second trigger, the output of which is connected to the first input of the second element I, the output of which is the output the input of the second counter and the information input of the first trigger are connected via the keyboard contacts to the outputs of the decoder, the output of the first trigger is connected to the control input element The barring input, the control input of the switch and the input of the control panel element, the output of which is connected through the first element I to the information input of the second trigger, the second input of the first element I connected to the installation input of the first trigger and the output of the second counter, the counting input of which is connected to the second input of the second element And the output of the generator | pulses. : o SLE ng 73

Description

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 o The invention relates to automation and digital computing and can be used in various digital devices and devices. Known key encoding devices containing a decoder, the outputs of which are connected to the first contacts of the corresponding keys l. However, these devices have limited functionality. The closest in technical dryness to the present invention is a device containing a decoder, keys, a pulse generator, a pulse counter, a prohibition element. The device allows simultaneous representation of a number (letters in the form of a K-element code represent it in a number-pulse number 2. However, the device is unreliable, since it does not provide protection against the rattle of contact keys, which inevitably occurs when it is pressed and releasing, resulting in the possibility of re-entering the same number and distortion of the number of pulses in a numeric code. The purpose of the invention is to increase the reliability of the entered information. To achieve this goal in an information input device, more keyboard, decoder, pulse generator, the first counter, the prohibition element, the output of the pulse generator is connected to the information input of the prohibition element, the output of which is connected to the counting input of the first counter, inverters are added, the first and second elements are And, the first and second triggers, the second counter, the delay element and the switch, the outputs of which are the outputs of the parallel device code, the outputs of the first counter are connected. with the inputs of inverters, the outputs of which are connected to the information inputs of the switch and the inputs of the decoder, the first output of which is connected to the installation input of the second trigger, the output of which is connected to. the first input of the second element I, the output of which 1 is output by the serial code of the device, the installation input of the second counter and the information input of the first trigger I, are connected to the outputs of the censhifter via the keyboard contacts, the output of the first trigger is connected to the control of the prohibition element that controls the switch and the input of the delay element, the output of which co1 372 is dinene through the first element I with the information input of the second trigger, the second input of the first element I connected with the installation input of the first. ger and output of the second counter, the counting input of which is connected to the second input of the second AND gate and the output of the pulse generator. The drawing shows a diagram of the proposed device. The device contains a keyboard 1, a decoder 2, a generator of 3 pulses, prohibition element 4, the first element And 5 the second element And 6, the first trigger 7, the second trigger 8, the inverters 9, the first counter 1.0, the second counter 11 ,. the delay element 12, the switch 13, the move No. 2 of the parallel code, the output of the sequential code No. 1 of the device. The device works as follows. In the initial state, the keys 1 are open .. A pulse generator generates pulses that arrive at the information inputs of the prohibition element 4, element 6 and counter 11. Counter 11, after a time equal to the total count period ut, from the transfer output, sets the pulse that sets the trigger 7 in the state O. At the output of the trigger 7, a signal is generated that permits the passage of pulses from the generator 3, the element 4 prohibiting the counting input of the counter O. The output of the counter generates a k-element code (where k is the number of bits of the counter, which Rory 9 is fed to the input of the decoder 2, which converts the t-element binary code to decimal. At the outputs of the decoder 2, logically 1 is formed sequentially, at its inputs, logical 1 from the first output of the decoder 2 is fed to the trigger input 8 and sets it to the state O. At the same time, the signal O, coming from the start of the trigger 8 to the input of the element 6, blocks the passage of pulses from the generator 3 to the output of the serial code of the device. The signal C, coming from the output of the trigger 7, blocks the passage of the k-element code from the outputs of the inverters 9 to the output of the parallel code of the device. Thus, in the initial state (all keys 1 are open), there are no signals on output buses No. 1 and No. 2. And the status O of triggers 7 and 8 is periodically confirmed by signals, after that, respectively, from the first output of the decoder 2 and from the output of the counter 11. When you press one of the keys while the code of the decoder 2 is to match the position (but measure) of this key through a closed contact, it will go to the trigger input 7 and the setup input of the counter 11, the counter will be set to zero, and the trigger 7 to the state. The output signal from the trigger 7 goes to the setup input of the element 4 prohibitions, blocks pro pulse output from generator 3 to counter 1O input. At the same time, this signal arrives at the control input of the switch 13 and permits the passage of the k-element code onto bus No. 2. When the key is pressed, short-term opening of the contacts occurs. However, in the proposed scheme, they do not lead to a change in the signals on the No. and Isfe 2 buses. When the contact is opened for the time et at the input of the trigger 7 and the installation input of the counter 11 fs, the world-pc signal O, which allows the counter to count 11, and the trigger 7 - setting to state O. However, due to the fact that the full counting period of the fit counter is taken longer than the contact closure time, the output of counter 11 does not work, but the signal 1 received when the contact is closed again sets counter 11 to zero socio and rodgverdig state of logical 1 and trigger 7. I ra When otzhagii keys proiskhopit softening circuiting of contact soprovozhparmoe pulsing it at time E o For the above reasons, during the time of transition from a closed contact-th state to the open state of the circuit elements and signals on the output buses are not izmenits. When the contact is fully opened, the counter 11 is unlocked and after a time d1 equal to the full counting period, the signal that sets the trigger 8 to the logical state, and the trigger 7 to the logical O, which arrives after a time o, introduced by the delay element 12, the entry of the element I 5 and the passage of the further neck of the pulses from the counter 11 to the trigger input 8. At the same time, the output of the trigger 8 & 8 to the input of the element 6 receives a signal allowing the passage of pulses from the generator 3 to the bus number 1, and the output of the trigger 7 will form signal Sending pulses from generator 3 through element 4 of the prohibition on input of counter 1О and prohibiting the passage of binary code to bus No. 2 through switch 13. Bus no. 1 will receive pulses from generator 3 until the inputs of the decoder 2 are generated. code corresponding to the first exit. At the same time, logical 1 will arrive at the first output, which will set the trigger 8 to the state O and block the passage of pulses from the generator .3 to the bus XB 1 through the element 6. The number of pulses on the bus No. 1 will correspond to the k-element code generated on the tires No. 2. This is achieved through the use of inverters 9. Compared with the prototype, the proposed device is more reliable as it provides protection against the bounce of key contacts. This protection is a common l of all keyboard keys, which allows to achieve a positive effect at low cost.

Claims (1)

INFORMATION INPUT DEVICE, comprising a keyboard, a decoder, a pulse generator, a first counter, a prohibition element, the output of a pulse generator is connected to the information input of a prohibition element, the output of which is connected to a counting input of the first counter, characterized in that, in order to increase the reliability * This input, inverters, the first and second AND elements, the first and second triggers, the second counter, the delay element and the switch, the parallel device code, the outputs of the first counter are connected to the inputs of the inverter tori, the outputs of which are connected to the information inputs of the switch and the inputs of the decoder, the first output of which is connected to the installation input of the second trigger, the output of which is connected to the first input of the second element And, the output of which is the output of the serial code of the device, the installation input of the second counter and the information input of the first trigger through the contacts of the keyboard are connected to the outputs of the decoder, the output of the first trigger is connected to the control input of the inhibit element, the control input of the switch and the input a delay element, the output of which is connected through the first element And to the information input of the second trigger, the second input of the first element And is connected to the installation input of the first trigger and the output of the second counter, the counting input of which is connected to the second input of the second element And and the output of the generator SU „„ 1057937>