SU1341629A1 - Information input device - Google Patents

Description

The invention relates to computerized automation and can be used for data entry in electrical typewriters, data preparation devices, cryptographic installations, etc.

The aim of the invention is to simplify the device.

The drawing shows a diagram of the device.

The device comprises a clock pulse generator 1, a counter 2, a decoder 3, a block 4 of memory, a multiplexer 5, a block 6 of switching elements, a block 7 of comparison, a switch of 8 modes, an element 9 and a driver 10.

The device works as follows.

A continuous sequence of pulses from the output of generator 1 is fed to the counting input of counter 2, which forms a periodically repeating sequence of code combinations. At times determined by the pulse repetition period of generator 1, the lower bits of counter 2 are decrypted in decoder 3, which alternately sets the polling potential on one of the contact groups 6 connected to one of the sides of the matrix, and multiplexer 5 turns on polling alternately one of its inputs connected to the columns of the matrix of block 6 and, therefore, each of the groups of second contacts of the switching elements connected to the columns. Thus, each switching element of block 6 is scanned.

In this case, those switching elements whose contacts are connected to columns connected in parallel with several information inputs of multiplexer 5 are scanned with several codes according to the number of inputs of multiplexer 5 connected to these columns. Thereby, several switching codes corresponding to the modifications are assigned to these switching elements.

characters assigned to this commutator gg releasing of the switching element to the tutoring element in various input modes, for example, B - Russian, upper case, B - Latin, lower case, B - Russian, upper

at the output of multiplexer 5, a high level signal is reset and a low level appears, which through the element 9 enters the input

register, B - Latin, lower case.

When you click the polled in dan

The moment of the switching element, the electric potential from the output of the decoder 3 is transmitted through the contact of the block 6 and the multiplexer 5 to the input of the element 9. As the outputs are

the counter 2 is connected to the inputs of the block 4, then simultaneously with the scanning of the pressed switching element each scanning code of the counter 2 the block 4 outputs to the first inputs of the block

7 comparisons corresponding to him

the code indication, where this characteristic is compared with the code received at the second inputs of the comparison block 7, which is currently set to

switch 8.

If the next code feature corresponds to the keyboard mode at the moment, then from the output of the comparison unit 7 to the second input of the AND 9 element

a resolution impulse is given. If the resolution pulse coincides with the pulse that came from multiplexer 5, from the output of the AND 9 element to the first input

shaper, designed to handle chatter, a pulse is applied, which, entering the input of generator 1, blocks the generation of clock pulses and thereby fixes the signal to

the output of multiplexer 5 and the state of counter 2. Thus, if one of the switching elements is pressed, the erroneous subsequent pressing of the second (and third) switching elements

does not change the state of the circuit. At the same time, the code fixed at the output of Counter 2 and corresponding to the code of the symbol of the pressed switching element in the keyboard mode, set

the mode select switch 8 is output to the device. If, in the code feature, being inputted from block 4, the bit defining automatic code repeat at the keyboard output is set to the active state, the code shaper 10 periodically repeats the code readiness signal strobe the information entered into the interacting device. With

releasing the switching element

at the output of multiplexer 5, a high level signal is reset and a low level appears, which through the element 9 enters the input

31341629 4

shaper 10. As a result, with the output pulses - the signal of the blocking of the device, the signal and scanning of the matrix of the block 6 is removed, the readiness of the code, and from generator 1 is resumed.

Claims (1)

A DEVICE FOR INFORMATION INPUT, comprising a clock generator, a decoder, a counter, a block of switching elements, a multiplexer, a memory block, a switch and a driver, one output of which is a gate output of the device, and the other is connected to the input of a clock generator, the output of which is connected to the counter input the outputs of which are the information outputs of the device and are connected to the address inputs of the memory block, the outputs of the upper and lower bits of the counter are respectively connected to the address inputs odes of the multiplexer and with the inputs of the decoder, the outputs of which are connected through the block of switching elements to the information inputs of the multiplexer, characterized in that, in order to simplify the device, it contains a comparison unit and an element And whose inputs are connected to the outputs of the multiplexer and the comparison unit, and the output to the first input of the shaper, the second input of which is connected to the output of the memory unit, the group outputs of which and the g outputs of the switch are connected to the corresponding inputs of the comparison unit, the decoder outputs through the com unit mutation elements are connected to η information inputs of the multiplexer, where 1 A η <- m; m is the number of information inputs of the multiplexer.