SU526850A1 - The device of measurement of time with digital indication - Google Patents

Description

The invention relates to the field of electronic timekeeping and can be used in electronics, measurement technology and automation both for indicating the current time in digital form and for issuing it in binary-tenth or phase-pulse codes.

Time measurement devices with digital indication are known, comprising a quartz oscillator, dividing and counting decades on multistable elements, a descrambler and a digital indicator 1.

The disadvantage of such devices is the presence of a dynamic error that occurs when the code is sent to the current time values.

The closest in technical essence is a time measurement device with a digital indication, containing a crystal oscillator, the first output of which is connected via a coincidence circuit and a frequency divider to the input of a direct counting counter, consisting of successively recalculating circuits with different conversion factors and end-to-end transfer collected on static triggers with synchronization inputs, the second output of the crystal oscillator is connected to the input of a constant generator, the outputs of which are connected to accordingly

the combined sign electrodes of digital indicators, the common electrodes of which are connected to the outputs of the counting circuits, and one of the outputs of the constant generator is connected to the other input of the coincidence circuit 2.

The disadvantage of such a device is the impossibility of obtaining the binary-decimal code of the current time without additional

cost of code conversion.

The aim of the invention is to extend the functionality of the time measurement device, which is achieved by introducing pulse shapers, block

control and key, and the combined synchronization inputs of scaling circuits with the same scaling factor less than ten are connected to the outputs of the corresponding pulse shapers, and the combined synchronization inputs of scaling circuits with the scaling factor of ten are connected to the key output and to the same inputs of drivers bursts of pulses, the other inputs of which are connected to the corresponding outputs of the constant generator, one of the outputs of which is connected to the control unit, the second output of the quartz gene Ator connected to one input key, the other input of which is connected to the control unit.

Ha FIG. 1 shows a block diagram of the device; in fig. 2 - time diagrams for his work.

The time measurement device with digital indication contains a crystal oscillator 1, a coincidence circuit 2, a frequency divider 3, an irregular count counter 4, a counting circuit 5 with a different conversion factor and end-to-end transfer collected on static triggers, a constant generator b, digital indicators 7, control unit 8, pulse shaper 9 and 10, key 11.

The first output of the crystal oscillator 1 is connected via a coincidence circuit 2 to the input of a frequency divider 3, the output of which is connected to the input of a forward counting counter 4 containing successively recalculating circuits 5. The second output of the crystal oscillator 1 is connected to the input of a constant oscillator 6 whose outputs are connected to respectively, the combined sign electrodes of the digital indicators 7, the common electrodes of which are connected to the outputs of the counting circuits 5. The output of the constant “About the generator 6 of the constants is connected to the second input of the circuit s matcher control unit 2 and 8. Log synchronization sixth scaler circuit 5 having a conversion factor of four, connected to the output of the pulse train 9, generating four pulse burst. The synchronization inputs of the second and fourth scaling circuits, having a scaling factor of six, are connected to the output of the driver 10, generating six pulses per burst. Through the key AND, which is opened by a signal from the control unit 8, pulses are transmitted from generator 1 to one input of pulse shaper packs 9 and 10 and to the combined synchronization inputs of the first, third and fifth counting circuits 5, which have a conversion factor of ten. The other inputs of the pulse driver 9 and 10 are connected to the corresponding outputs of the constant generator 6.

The device works as follows.

. When the device is turned on, the pulses from one generator output (Fig. 2a) are fed to the generator 6 input - constants and through the key 11, which is opened by a signal from the control unit 8, are fed to the synchronization inputs of the counting circuits 5 (Fig. 2) with a factor recalculation is equal to ten, i.e., to the first, third and fifth recalculation circuits 5. The same pulses go to one input of the formers of the pulse bursts 9 and 10, which output the bursts of pulses, respectively, four and six pulses in each batch ( Fig. 2e, d). The outputs of the pulse formers 9 and Yu, respectively, are connected to the synchronization inputs of the counting circuits 5, which have a conversion factor of four (sixth circuit 5) and six (second and fourth circuit 5), respectively.

Thus, the work of all clocks.

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clocked by clock pulses. When the generator of a constant of ten clock pulses arrives at the input of the generator 6, a pulse with the constant "O (Fig. 2 g" O) appears on its B1 opening, opening the coincidence circuit 2, which passes every tenth pulse from the other output of the crystal oscillator 1 (Fig. 2c). This pulse does not coincide in phase with the pulses from the first output of the generator 1 (Fig. 2 a).

The pulses from the output of the coincidence circuit 2 are fed to the input of frequency divider 3, which are divided up to the frequency of I Hz.

It should be noted that constant generator 6 has ten outputs at which there appear

successively one after another impulses of copants “O ...“ 9 (Fig. 2d). Using the constants "O", "3 and" 5, bursts of pulses are formed in the formers 9 and 10. In addition, the outputs of the generator 6 of the constants are connected to respectively the combined sign synthesizing electrodes of the digital indicators 7, to the common electrodes of which pulses are fed from the counting circuits 5.

When the input of the counter 4 direct counting pulses with a frequency of 1 Hz from the divider 3 frequency of the first and second counting circuits 5 sequentially pass through a series of states, accumulate time information. In this case, the countdown on the digital indicators 7

the arrival of each pulse increases by one, indicating the value of the current time in seconds. In this case, recalculated circuits 5 with a recalculation factor of ten (i.e., the first, third, and fifth) can produce

impulses whose phases coincide with the constants from “O to“ 9, and the pulses from the second and fourth recalculating circuits 5, which count the pulses following respectively a time interval equal to tens of seconds and tens of minutes, and have a conversion factor of six , can produce pulses, the phases of which coincide with the constants from "O to" 5. Sixth recalculation scheme 5 - the counter “ten hours has

a conversion factor of four, and gives impulses, the phases of which can coincide with the impulses of the constants "O ..." 3. The “hours counter” is assembled in paragraph five and sixth recalculation schemes 5 and has a total conversion factor equal to twenty four. Thus, during the operation of the clock during one day, the recalculation schemes 5 sequentially pass through a number of states from 00 hours 00 minutes 00 seconds to 23 hours 59 minutes 59 seconds. Then, all conversion circuits 5 are updated and the pulse counting process is repeated automatically.

Now consider the operation of the proposed device in such a mode, when the control unit 8 closes the key I. In this case, the indication of the state of the counting circuits 5 digital indicators is impossible, although the process of counting pulses with the direct counting counter 4 continues, i.e.

time accumulated in scaling schemes.

persists. In this case, it is also possible to remove the potential binary-decimal code of the current time.

In the described mode, a crystal oscillator 1, a constant generator 6, a matching circuit 2 and a frequency divider 3 work in a similar way as it was described earlier, i.e., the frequency divider 3 generates pulses in phase with the output pulses of the coincidence circuit 2 every second.

The control unit 8 from the operator (or from the mashina) receives a pulse (Fig. 2h).

This impulse translates the control unit 8 into such a state that when the impulse of the constant O comes to it, the key closes key 11 (Fig. 2i). Starting from this point in time, the pulses from the output of the key 11 and the drivers 9 and 10 do not arrive at the synchronization inputs of the conversion circuits 5.

As a result, scaling circuits 5 retain the current time code recorded in them and continue to count the second pulses from the divider 3 frequencies in the usual way, since scaling circuits 5 in this case form a pulse counter collected on static triggers, the binary-decimal digits of which connected in series and have a conversion factor, respectively: 10-6-10-6-24.

In order to open the key 11, it is necessary to apply a signal to the control unit 8 from the outside. By this signal, the transition control unit is in such a position that with the arrival of a constant pulse, a key 11 opens at its trailing edge, through which pulses from the crystal oscillator 1 to the inputs of drivers 9 and 10 and to the synchronization inputs of the first, third and fifth scaling circuits 5. The formers 9 and 10 begin to generate bursts of pulses that arrive at the synchronization inputs of the other scaling circuits 5. The digital display begins to indicate the state of the scaling circuits 5.

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Claims (2)

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