SU467375A1 - Graphic reading device - Google Patents

Description

element 5 to the logical element AND 7 and the delay line 9. The zero state of the pulse-counter meter is converted by the decoder 13 to a note, which through the OR 12 gate allows the first pulse-pulse to pass through the logical element 7. Pulse from the output of the logic element 7 sets trigger 2 to one. A single trigger state prohibits the passage of pulse marks through logic element 5 and permits the passage of generator pulses 16 through an AND 4 logic element into an ordinate counter 15. A pulse from the output of delay line 9 enters the unit into a pulse-marker counter 3.

At the end of the sweep, the photovoltaic unit 1 generates a measurement end pulse, which, through delay line 8 and the logical element OR 10 sets trigger 2 to the zero state, prohibiting the passage of pulses through the logical element AND 4. In the ordnat counter, the ordinate of the first read curve is displayed.

The first impulse mark of the second sweep cycle from the third output of the photovoltaic block 1 passes through the logical element AND 5. The decoder 13 only allows the impulse-marks to pass through the logical element AND 7 if the counter-marks 3 are in the state ( K + 1) K

- 1, where K 0, 1,

"O," 2, "5, ...," 2, ..., n (n is the maximum number of curves that the device can read) and if the reading of this curve is not prohibited by the corresponding toggle switch 14, select the number and number of readable curves.

The first pulse-mark of the second sweep cycle does not pass through the logic element 7, but through the delay line 9 adds one to the pulse-marker counter, allowing passage of the second pulse-mark of the second cycle through the logic element 7 to a scan. During the third scan cycle, a third curve is read out, and so on.

After reading the pth curve of the graph, in the pulse-rate counter there is a code

---. If there is a bit of K on the graph

the curves, then for s + 1 the sweep cycle through the logic element 7 does not pass the pulse mark and the trigger 2 remains in the zero state. The trigger permits the passage of a measurement end pulse from the first output of the photovoltaic unit 1 through the logical element "OR 11 and the logical element" And 6 to the input of the photovoltaic unit. The measurement cycle is complete.

0 If until the end of the sweep an overrun of the pulse-pulse counter 3 occurs, the overflow pulse through the logic element 11 and the logic element 6 passes to the input of the photovoltaic block.

Subject invention

A device for reading graphic information containing a photovoltaic block, the first output of which is connected to

0 by ordinate through sequentially

included first delay line, first

logical element "OR, the second input

connected to the second photovoltaic output. unit, a trigger with two inputs and outputs, and an “AND” logic element connected to the generator’s second INPUT, the third output of the f | 0toelectric -block is connected to the second trigger input through a series-connected second logic

0 element "And, the second input of which is simultaneously connected to the second output of the trigger and one of the inputs of the third logical element" And, and the fourth logical element "And with two inputs, while the first output of the photovoltaic block is connected to another input of the third logical element" And through The second logic element "OR with two inputs, characterized in that, in order to increase its reliability, the second output of the photovoltaic unit is connected to the second input of the fourth logic element" And through sequentially connected counters a pulse-stamp, a second input coupled to an output of the second NAND gate "and through the second delay line, and an output - to a second input of the second logic element" OR deschifrator connected the second input to the output of the toggle switch, and a third logic element "OR