SU1536410A1 - Device for reading information from punched carrier - Google Patents

Abstract

The invention relates to automation and computing and can be used in devices for inputting information from perforating media in computing systems. In order to increase the reliability of reading information, a key is inserted in the device that switches the emitter and photodetector of the sync channel, and a counter, which eliminates false readings due to bounce due to delaying the reading process by several cycles, inserting the same key for gating the emitter and photodetector of the sync channel completely eliminates the mutual illumination of photodetectors. 2 Il.

Description

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The invention relates to automation and computer technology and can be used in information input devices with a perforant in computing systems.

The aim of the invention is to increase the reliability of reading information.

Fig „1 shows the functional diagram of the device; figure 2 - the timing diagram of his work0

The device contains the first register 1, block 2 of keys, block 3 of emitters, information photodetectors 4 (informational and synchronizing) first and second threshold elements 5 and 6, second register 7, trigger 8, clock generator 9, counter 10, driver 11 single pulses consisting of 12 triggers and

13 and element 14, informational outputs 15 of the device, synchronizing the output 16 of the device, the key 17, the emitter 18, the photodetector 19 clock pulses.

The device works as follows.

In the initial state, the optical connection between the emitter 18 and the photoreceiver 19 of the synchronization channel is interrupted by a perfuming medium. In this case, from the photodetector output, through the second threshold element 6, a zero signal arrives at the reset input of counter 10, which does not affect the counter. The counting input 9 of the counter 1 receives a continuous sequence of clock pulses from the output of the generator 9. For each pulse, the counter 10 changes its

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state until a single signal is established at the output of the transfer, which is fed to the control input of the counter and blocks the continuation of the counting. The transfer signal from the output of the counter 10 is fed to the input R of the trigger 8 and holds it in the zero state. From the inverse output of the trigger 8, a single signal is taken, which opens the key 17 of the synchronization channel. The public key includes the emitter 18 and the photodetector 19 of the synchronization channel. When the perfonitel is moving, the optical connection between the emitter and the photoreceiver is restored with the appearance of a synchronizing hole in the reading line of the device. In this case, the synchronizing channel photoreceiver 4 senses the radiation flux and produces a single signal that passes through the threshold element 6 to the input R of the counter 10. The counter is reset, the zero signal is removed from its transfer output, which is fed to the control input of the imager 11. Shaper 11 accepts a transfer signal to the information input of trigger 12. Clock input from generator 9, which is received at inputs C of flip-flops 12 and 13, arrive at clock input of generator 11. On the first clock pulse flop 12 receives the null state, for the forward flip-flop 12. The output of the zero set signal which is supplied to the data input of flip-flop 13. At the second clock pulse at the output 13 pa trigge- zero signal is set. The inputs of the And 14 element receive signals from the inverted output of the trigger 12 and from the output of the trigger 13, under the action of which a single pulse with a duration of one clock period is generated at the output of the And 14 element. A single pulse is output from the generator 11 to the input S of trigger 8 and information input D of the first register 1. Under the action of a single pulse, the trigger 8 is set to state 1 and stops the synchronization channel. Simultaneously from the direct output of trigger 8 to

the enable input of the synchronization of the second register 7 receives the enabling signal Under the action of clock pulses arriving at the inputs of the syn

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By synchronizing the first and second registers 1 and 7, the information channels of the device are read. The first register 1 sequentially shifts a single pulse from the information input to the outputs of all bits of the register. In this case, alternately, the keys of unit 2 are opened, which include the respective emitters and photodetectors. At the output of the photodetector operating at a given time, a signal is produced that corresponds to that deposited on a perfuming medium. From the output of the photodetectors unit 4 signal through the threshold element 5 is fed to the information input D of the second register 7, which in each cycle, starting with the second, sequentially records the signals of all information channels. Upon completion of polling all information channels from the output of the last bit of the first register 1 to the synchronization input of trigger 8, a pulse goes through which the trigger goes to the zero state, the information channels are switched off and the synchronization channel is turned on, a single signal is removed from the photoreceiver 19 and goes through the second threshold element to the input R of the counter 10. The counter is reset and held in the zero state until the perh-carrier sync track again interrupts the optical link between the emitter and the photodetector of the synchronization channel, after which the device returns to its original state. The read sperf carrier information is output to the device 15 from the outputs of the second register 7 and is maintained throughout the zero state of the trigger 8, from the direct output of which the sync signal is simultaneously output to the device 16.

Thus, the introduction of a synchronization channel and an additional key into the device and sequentially polling all the reading channels completely eliminates the parasitic illumination of the photoreceivers and the possibility of a false response due to the bounce of the synchronization channel signal.

Formula

515364

the invention

A device for reading information from a perforant containing a trigger, a clock pulse generator, the output of which is connected to clock inputs of the first and second registers and a generator of single nm pulses, a block of keys, the inputs of which are connected to the corresponding outputs of the first register, and the outputs block emitters, informational photodetectors, the outputs of which are connected to the input of the first threshold element connected to the D input of the second register, the outputs of the second register are informational outputs As the device is connected in series with the photodetector of clock pulses and the second threshold element, the high-order output of the first register is connected to the C input of a trigger, the D input of which is connected

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with the tire of zero potential, and pr -. My output is connected to the second register control house and is a synchronizing output of the device, characterized in that, in order to increase the reliability of the information readout, it contains a key and a counter, the output of which is combined with a setup input and connected to the control input of a single generator. pulses and with the R input of the trigger, the output of the clock generator is connected to the C input of the counter, the R input of which is connected to the output of the second threshold element, the output of the generator of single pulses is connected to the S input of the trigger with the D-input of the first PE Giustra, key input coupled to an inverted output of the flip-flop, and an output - to the radiator sync strobiruyu- Suitable inputs information and synchronizing photodetectors connected to outputs of the respective keys.

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Claims (2)

Claim Device for reading information p. a carrier containing □ Trigger, a clock generator whose output is connected to the clock inputs of the first and second registers and a single pulse generator, a key block whose INPUTS of the 10th are connected to the corresponding outputs of the first register, and the outputs to the corresponding emitters of the block, information photodetectors the outputs of which are connected to the input of the first 15th threshold element connected to the D-input of the second register, the outputs of the second register are information outputs of the device, sequentially connected an internal photodetector 20 clock pulses ’and a second threshold element, the high-order output of the first register is connected to the trigger C-input, the D-input of which is connected to the zero potential bus, and direct. my output is connected to the control input of the second register and is the synchronizing output of the device, characterized in that, in order to increase the reliability of reading information, it contains a key and a counter, the output of which is combined with the installation input and connected to the control input of the single pulse generator and with R -in the trigger input, the output of the clock generator is connected to the C-input of the counter, the R-input of which is connected to the output of the second threshold element, the output of the single-pulse generator is connected to the S-bxo | trigger house with the D-input of the first register, a key input coupled to the inverted output of the flip-flop, and an output - to the radiator clock, strobe and clock inputs information photodetectors connected to outputs of the respective keys. FIG. / e P GKPΠΓβ dp ^N 1 W wsh. ΣΤ. ® H 12 ' -------------------------------------------------- ----------------------------------------------1 1 j E 14 8 X ... Nude ——— d D-- / A — v i— U ------ FIG. 2.