SU388283A1 - DEVICE FOR CONVERSION GRAPHIC - Google Patents

Description

one

The invention relates to the field of computer technology, in particular to input devices in the digital computer for graphic information.

A device for converting graphic information is known, comprising a plate with mutually perpendicular tires connected to the outputs of the decoders, the inputs of which are connected via reversible counters connected through a switch to a generator through the drivers and connected to an amplifier-limiter whose output is connected to the multivibrator and to the non-switch of the kind of work connected to one of the inputs of a joint scheme, the other inputs of which are connected to one of the lines behind der ki connected via a switch to the generator and a reversible counter and one of the group of gates and the output of the multivibrator circuit via "OR connected to the counting inputs of the sign direction of scan flip-flops.

However, in such devices, in small areas of the tablet, a small signal-to-noise ratio is observed, with the result that in some cases the received interference or switching noise is taken as a signal of a reading element.

For the purpose of reliability, the information in the proposed device was converted.

matching circuits are connected via other delay lines to one of the inputs of the sweep direction sign triggers, the other inputs of which are connected to the gates and to the outputs of the matching circuits.

This involves switching the strips located outside the operator’s brush area, i.e., to the left and above the tip of the reading element, which is ensured by applying to the different inputs of the flip-flops controlling the addition and subtraction of pulses in the counters, delayed and non-held read signals, taken by the reading element.

FIG. 1 shows a diagram of a device for converting the graphic information being drawn into a code; in fig. 2 illustrates the sweep principle when switching strips along the X axis. (The arrows on the time scale indicate the H direction of the sweep movement when the reading element moves along the tablet surface).

The block diagram of the flatbed scan (Fig. 1) consists of two identical channels and a group of devices controlling these channels.

The input bus generator / pulses connect to the distribution terminal switch 2, having a neutral position when switching from one output terminal to another. One of the output terminals (right) of the switch is connected to the inputs for setting zero of the reversing counters 3, 4 channels Y and X, the other (left) - to the input of the reversible counter 3, the common input bus of the valve group 5, the input line 6 of the delay "circuit 7 coincidence" .

The reversible counters 3, 4 have input buses for inputting the reference coordinates Y and L, selected on tablet 8, input and subtracting buses controlled by triggers 9 10 of the direction symbol, input bus for readable clock speeds, connected to the left output terminal of switch 2 , for a reversible counter 3 and an input bus (for a reversible counter 4) for the arrival of delayed clock pulses connected to the output of the delay line 6, the input of which is connected to the same (left) terminal of the switch 2.

The paraphase outputs of the reversible meters 3, 4 are connected to the inputs of the valve groups 5, 11, direct connected to the vents of the valves 12 and 13. Each group of valves 5 and 11 has one for each group, a bus connected for a group of valves 5 the left output terminal of the switch 2, and for the group of valves 11, with the output of the delay line 6, which are supplied with clock pulses. Groups of valves 5 and 11 are designed to convert the povdial code of reversible counters of 3, 4 V, pulsed when clocks and delayed clocks are received at the valves.

Outputs of valve groups 5 c. II are connected to the inputs of the formers 14, 15, and the outputs of the latter are connected to the sharafaznymi inputs of the pulse decoders 16 and 17. The output buses of the decoders 16, 17 are connected to the horizontal and vertical stripes of the tablet 8 in order of increasing numbers.

The pulses applied to the coordinate strips are perceived through a capacitive coupling, the sensing element 18, which is a metal writing rod with a ball-point placed in shielded Corius and insulated from the body. The output of the reading element 18 is connected via a shielded cable to the input of the limiting amplifier 19. This amplifier is designed to amplify signals of one polarity AND | restrictions are different. The output of the amplifier-limiter by shielded wire is connected to the switch of the 20 kind of work and the synchronization input of the multivibrator 21.

Switch 20 serves to switch the operating mode: tracking mode and automatic search; the mode of generating a raster at the separation point.

As shown in FIG. 1, the first mode is enabled (the upper pair of contacts is stuck). One of the upper terminals is connected by a shielded p-wire to the output of the amplifier-limiter 19, the second upper terminal of the screened-earthed wire is connected to the inputs of the circuits 7 and 22 of the match.

The second inputs of the matching circuits are connected to the left terminal of the switch 2 and the output of the delay line 6, respectively.

The coincidence circuits serve to pass an amplified signal in channel Y or channel X. The delay line provides a time shift of the deduction pulses of channels Y and X, which is achieved by alternately switching the strips U, then X, and so on.

The outputs of the matching circuits are connected to the inputs of the valves 12, 13, the inputs of the delay lines 2c and 24, and the inputs of the flip-flops 9 and 10. The valves 12, 13 have inputs connected to the direct-output outputs (outputs of the direct code of the reversible counters 3, 4) . Each valve group has a common input bus connected to the output of circuit 7 and 22, respectively. Valves 12 and 13 are designed to output to the trunk the values of the Y and X code of the polled strip, above which there is a reading element.

Lines 23 and 24 delays have one by one.

an input connected to the outputs of circuits 7 and 22 ° C; a depression, and one output connected to the inputs of flip-flops 9 vi 10 of the sign of the direction of the line. Delays are provided to form the dimensions of a small raster by delaying the incoming signal by several clock intervals. The directional sign triggers have inputs connected to the outputs of delay lines 23 and 24, inputs connected to the outputs of coincidence circuits 7 and 22, and counting

the inputs connected to the OR 25 circuit, the outputs connected to the control addition — and the subtraction of the inputs of the reversible counters 3, 4. Triggers are designed to switch

work counters on the summation or subtraction. The non-held signals of the reading element switch the triggers so that the switching of the bars of the tablet starts from the point of the reading element to the external

relation to the location of the operator’s kirti. The delayed signals switch the triggers so that the counters are counted in the opposite direction and the switching of the strips is carried out towards the tip of the reading element. Then qi; cl is repeated again throughout the work. Sequential switching of triggers from incoming signals allows obtaining a small raster (reciprocal polling of strips) on

Any part of the tablet.

The multivibrator 21 has a synchronization input connected by a shielded wire to the output of the amplifier-limiter 19, a common bus connected to one of the lower

the terminals of the operation switch 20 for connecting to the cornea (power supply) and the output bus connected to the input of the separation circuit OR 25.

When disconnected from the body of the common bus

multivibrator not working and starting