SU898410A1 - Data input device - Google Patents

Description

The invention relates to computer technology and can be used in automated information processing systems for entering data into a computer from a keyboard. Such devices as electrified typewriters, teletypes, and video terminals that have a full keyboard for entering digital service and alphabetic information in Russian and Latin al ({curls. However, the use of these tools for technical and economic reasons is not always possible because of their complexity, large size and high cost. Reducing the size of the information input equipment can be achieved with the use of a multi-function keyboard, when The same key, depending on the position of the controls, combining it with other keys or the sequence of its selection, is relative to other keys, is used to encode different characters of the alphabet. A device containing a key matrix, a scan counter, code converters and a sampling keyboard is known. depending on the state of which the contents of the sweep counter corresponding to the selected key, the matrix is converted into one of two possible character codes 1. The disadvantage of the known devices is a large number of keys in the matrix, equal to half the number of characters of the alphabet, as the entire alphabet is divided into two zones. The closest in technical essence to the proposed solution is a device for inputting information, which contains a keyboard whose conclusions are connected to the outputs of the exchange register, the element I, the left and the same one, the second one-vibrator whose output is connected to the input of the 3 O register of the exchange, the decoder and encoder. In addition, the device contains a comparison unit, the inputs of which are connected to the same keyboard inputs to which the inputs of the exchange register are connected, and the taker, whose first (counting) input is connected to the output of the comparison unit, the outputs to the control inputs of the exchange register . The device is intended to symbolically enter alphanumeric and control information in the DKOI codes using a keyboard containing 5 keys by pressing certain combinations of CL 8ISH 25 twice. The disadvantages of the device are low input speed, coding complexity, drive | Yes to a large number operator errors, and low reliability. The slow entry speed is due to the push-pull method of forming a code in the exchange register — the code of any character is independent of the frequency of its occurrence in the text and the nature of the entered information is formed in two keyboard cycles. In this device, the principle of implicitly dividing avs aviton into zones is applied, when a zone is selected by the first key combination, the second is a symbol within that zone, with the peculiarity that the code of the selected zone is not saved for subsequent characters. The complexity of encoding information is due to the fact that the number of characters that can be encoded by double pressing one of the five keys is only 25, which is not enough to enter text information. Consequently, for each press, you need to select a combination of several (at least two) keys, and the keys can have only symbols, not having a connection with their functional purpose, which leads to the need to pre-code the original data in conventional keyboard codes . The reliability of the device is low due to the use in the comparison unit of the output signals from normally open keyboard contacts. The phenomenon of contact bounce when they close causes false operation of the comparator unit, the output of which switches the clock counter several times with one press of the keys 04 WHAT leads to the formation of a false output permission signal for input and distortion of information transmitted to the computer. The aim of the invention is to increase the speed of the device and increase the reliability of its operation. The goal is achieved by the fact that in an input device containing a keyboard, the outputs of which are connected to the inputs of the first register, the element I, the first one, the second one, the output of which is connected to the zero input of the first register, the decoder and encoder, the outputs of which are connected: the second register, the third one-shot, the trigger and the signal conditioner, whose inputs are connected to the keyboard outputs, and the first and second outputs are connected to the inputs of the second and first o one-shot, the decoder inputs are connected to the keyboard outputs, and its outputs are connected to the corresponding inputs of the second register and the single trigger inputs, the first output of which is connected to the input of the third one-oscillator, the second output of the trigger is connected to the first input of the I element, the second input of which is connected to the output of the first one-shot, the output element And is connected to the output of the device, the zero input of the trigger is connected to the output of the second one-shot, the output of the third one-shot is connected to the zero input of the second D istra which outputs soedineyy with one input of the encoder, the other inputs of which are connected to the outputs of the first register. Introducing the second register into the device allows replacing the push-pull mode of the keyboard with single-touch when entering characters belonging to one zone, which allows for increased speed. In addition, the presence of a second register allows to reduce the number of operator errors and increase the speed of input by replacing multi-key coding of single-key characters entered into computers by saving keystrokes in a relatively rare operation - switching the register of zones. The third one-shot is designed to control the change of information in the zone register, and the trigger entered into the device allows character encoding and transitions from one alphabet to another using the same keyboard elements by disabling the generation of an input signal switching the register of zones.

The introduction of a signal conditioner into the device allows us to eliminate distortions in the output information associated with transients in the com mutation of keyboard contacts, which increases the reliability of the device. FIG. Figure 1 shows the block diagram of the device for inputting information2 — time diagrams; in fig. his works. The device contains a keyboard 1, a decoder 2, the first exchange register 3, a signal conditioner, a trigger 5, a second zone register 6, a first one-oscillator 7, a second one-oscillator 8, a third one-oscillator E. An encoder 10, element 11 AND, the positions 12 and 13 denote the device outputs, the parallel binary code of the symbol c is removed from the outputs 12. according to the code table COI-7E.GOST 13052 7, and the output 13 of the device produces an information input signal that synchronizes the exchange of data with a computer. The device operates in the following manner. In the initial state, signals from normally closed contacts of keyboard 1, containing K keys, come in the form of a voltage level of logical zero on To inputs of register 3 exchange. M input of the decoder 2 (NC) and to the inputs of the signal conditioner, the input C, in addition, a signal from the parallel-connected normal-open keyboard contacts. It is assumed that the free inputs of logic elements are affected by a signal of a logical unit, the level of which can be determined depending on the type of elements used (series of integrated circuits), the parameters of voltage dividers on resistors installed in the input circuits of the decoder 2, first register 3 and (or) shaper k signals. In the first (direct) output of the signal conditioner, in its initial state, the logical zero signal is applied, and on the second (inverse) output, the signal of the logical unit. To switch the register of the 6 zones to the state corresponding to the input of, for example, digital information, two specific keys are simultaneously pressed. Delaying the operation of one of the keys relative to the other does not affect the operation of the device: at the moment when the unit level signals coming from the contacts of the selected keys match, on one of the outputs of the decoder 2 a setup 1 signal 1 appears. The output signal of which triggers the third single-oscillator 9, which produces Signal setting O register 6 zones. The duration of the output pulse of the third uni-vibrator 9 should be sufficiently short that after the end of this pulse, the signal from the energized output of the decoder 2 is recorded in the corresponding bit of the register of 6 zones 1. The pulse sequence caused by the bounce of the Contacts does not result to the distortion of the code in the register of 6 zones, since these pulses act on the separate input of installation 1 of the selected trigger as confirmation signals. When two keys are pressed simultaneously, the signal at the output of the third one-shot vibrator 9 can be generated earlier than the output pulse at the output of the second one-shot vibrator 8 (unlike the case shown in Fig. 2). However, in any case, after pressing two keys, the trigger 5 remains single state. When the shaper i is released, the signals ipexoidit to the initial state, the first one-shot 7 starts up, but the information signal at the output 13 of the device is not generated, since the inhibiting signal from the inverse output of the trigger 5 acts on the input of the element 11 11. entering information by successive keystrokes. each of which corresponds to a specific character within the selected alphabet area (numeric or alphabetic) .. Closing normally-open contacts when you press any key results in locking k-signals, the voltage drop from the first (direct) output of which starts, the second one-shot 8, which forms the signal% 1al of the setting O of the first register 3 and the trigger 5- With the end of the pulse of the new vibrator 8 into the bit of the first register G

7

pa 3, connected to the open key of the pressed key, is recorded 1. At the input of the encoder 10, unitary codes are received from the first register 3 and the second register 6, which are written in the KOI-7H code). When the pressed key is released when the normally closed contacts are closed, the skimmer k signals return to the initial state, and the first one vibrator 7 generates a pulse arriving through element 11 on output 13 as a signal to enable the input of a parallel code from the outputs 12 of the device to the computer.

In order to exclude multiple triggering of the signal generator k due to contact bounce, it must include a trigger with separate inputs of installation 1 and O, the outputs of which are the outputs of the signal generator k signals. Setting the specified trigger to one state should be accomplished by a zero-level signal from parallel-connected normally-open contacts, the setting of a trigger must be passed through an OR-NOT element that has inputs that are connected to the normally-closed keyboard contacts 1.

For various systems where keyboard input is performed, the number of characters in the alphabet, and hence the number of keys, can vary widely. The minimum number of keys in the device for single-key coding of input characters and two-key coding of zone numbers is in the following ratio with the number of characters A in the alphabet:

d-

(one)

  g.

From relation (1), it follows that to enter an alphabet containing 50 characters, it is sufficient to have 5 keys and divide the entire alphabet into 10 zones. However, in order to increase the speed of input by reducing the number of transitions from one zone to another, as well as to simplify coding, the proposed device uses a 12-key keyboard (ten-day keyboard, supplemented by two keys of service characters). The feasibility of using a decade keyboard is explained by the large relative amount of digital information in mass103.

There are two input keys on the computer, and two additional keys allow digital arrays to be entered, taking into account dividing characters and characters without switching the zone register.

Possible modifications of the device May consist in the use of other output codes (MTK, DKOI, KOI-8) defined by the construction of the encoder, as well as in the application instead of one encoder on seven outputs of two encoders on four outputs and on three inputs, the first of which encodes the state the input register, the second is the state of the zone register. It is also possible to use special keys to control the register of zones in order to exclude multi-key coding of zone switching signals and to introduce into the device elements of indication of the state of the register of zones.

The proposed device in comparison with the known allows to increase the speed of data entry by 3-5 times (depending on the nature of the information), which significantly reduces the cost of computer time. In addition, the completely time-consuming process of pre-coding the source data is eliminated, the operator’s workload is reduced and the number of its errors is reduced. Compared with known devices of similar purpose, having a full set of keys, the proposed device has the same functionality for entering information at a much lower cost and several times smaller volume and weight.

Claims (2)

1.Patent of Japan No., 0 cl. G About F 3/02, publ. 1978 2. USSR author's certificate If, cl. G 06 F 3/02, 1978 (about the totype).