SU828194A1 - Information input device - Google Patents

Description

I

The invention relates to the field of computing and can be used in the design of input-output devices.

A device for inputting information is known, comprising a keyboard connected to an encoder, a register, a one-shot, AND elements, a trigger with a fault indicator, and a comparison unit 1.

The closest in technical essence to the invention is a device comprising a data set unit connected to an encoder, shift registers, the control inputs of which are connected to the output of a single pulse shaper, and an input register 2.

A disadvantage of the known devices is low reliability when entering information.

The aim of the invention is to increase the reliability of the device.

The goal is achieved by the fact that, in the proposed device, the encoder outputs are connected to the inputs of a single pulse shaper and information inputs of the first bits of registers C, wig, the outputs of all bits of which are connected to the corresponding inputs of the information receiving unit.

The outline of the device is presented on the circuit.

The device contains a set unit 1, an encoder 2, a single pulse shaper 3, shift registers 4i-4 „and an information receiving unit 5.

The device works as follows.

When you press a key on dial block 1, a combination of potentials appears at the outputs of the encoder 2, representing the code of the dialed digit. The signals on the outputs of the encoder start the imaging unit 3, which generates a shift pulse. The leading edge of this pulse, with a delay of setting the code at the outputs of the encoder 2, shifts the information contained in the registers 4i-4 "by one bit, while the code of the dialed digit is recorded in the first bits of these registers. The delay in the formation of the leading edge of the shear pulse

with from

D min

Ishah where t

 minimal duration

input pulses, such as bounce pulses of contacts coming from the dialing unit, Atshp, ah is the maximum value of the delay difference for all outputs of the encoder. Practically for mechanical contacts, and the condition of TF is carried out due to the delay on the elements of the former. The falling edge of the shift pulse is formed after the key is released in the dial unit. The information recorded in all bits of the shift registers goes to block 5. Thus, the information (digits) in this device is entered at the time a key is pressed, which allows you to block the device from accidentally pressing two or more keys (in this case, enter information from the key pressed first).

The proposed device is distinguished by high reliability, simplicity of circuit design and ease of operation. The ability to enter information with low latency relative to the moment of pressing a key allows blocking the input of false information and reduces the quality requirements of the signals from the dialing unit.

Claims (2)

Invention Formula An information input device comprising a data set unit connected to an encoder, shift registers whose control inputs are connected to the output of a single pulse generator, and an information receiving unit, characterized in that, in order to increase the reliability of the device, the outputs of the encoder are connected to the driver inputs single pulse and with information inputs of the first bits of shift registers, the outputs of which are connected to the corresponding inputs of the information receiving unit. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 415656, cl. G 06F 3/02, 1971. 2. USSR author's certificate No. 271887, cl. G 06F 3/02, 1967 (prototype).