SU1293746A1 - Device for recording current time code - Google Patents

Abstract

This invention relates to digital recording devices. The aim of the invention is to increase the reliability of registration. The recording device allows for the removal and registration at any time of the values of the values of the current time code, which periodically changes in the accumulating counter. By introducing three pulse shapers of different durations and a delay element, a device operation diagram is generated, making it impossible to write the code of the accumulating counter into the time code register at the moments of the counter state change, regardless of the moments of arrival of the registration pulse. 2 Il. i (L; o 00 O)

Description

The invention relates to automation and computing, R digital recording devices and is intended to pick up and record at arbitrary moments the values of the current time code, which periodically changes in an accumulating counter.

The aim of the invention is to increase the reliability of registering the current time code.

FIG. 1 shows a functional diagram of the device; in fig. 2 time diagrams of his work.

The device (Fig. 1) contains the first 1, second 2 and third 3 pulse shapers, the first 4 and second 5 triggers, the pulse generator 6, the element NOT 7, the delay element 8, the first 9 and the second 10 elements And, the counter 11 and the register 12 The positions 13 and 14 in FIG. 1 denotes the first and second inputs of the device, respectively.

In the initial state, both the flip-flops 4 and 5 and the counter 11 are in the logical O state (zero circuits are not shown to simplify the drawing), the output of the generator 6 (Fig. 2 () is low).

The operation of the device begins with the arrival at the first input of the 13-pulse Start (Fig. 2), which triggers trigger 4, allowing the operation of the pulse generator 6 — a type of stand-by multivibrator with a control potential input. The timing diagram of the output pulses of the generator 6 is shown in Fig.26. According to the negative difference of these pulses, the state changes the counting state to 11, the output code of which goes to the information part of the register 12. On fi. . 2a shows a sequence of pulses of the generator 6, which is inverted by the element HE 7 and delayed for a time 1j by the element 8 of the delay. To simplify the temporal relations and the timeliness of the time diagram, the pulses from the output of the generator 6 are given in the form of a meander with a period T. Dn of this case as a precondition

t, iT / 2.

(one)

At the moment when it is necessary to register the time KOff, store | 1s in counter 11, i.e. rewrite it without distortions in the register 12 for printing or indication (output devices are not shown in the drawing), a registration pulse arrives at the second input 14 of the device (FIG. 2b, time t). This pulse is fed to the inputs of the first 1 and second 2 pulse shapers, operating on the positive differential at the input. The pulse formers 1 and 2 generate pulses of a certain duration at the output, thus eliminating the effect of the duration

input pulse to the device.

The first driver 1 pulses produces a pulse (Fig), the duration

 t / 2 + C, (2) and

(3)

(3-10) Gt / 2,

where Tf - the duration of the front of the delayed pulses (Fig.2A). From the output of the second driver 2 pulses to the S-input (first input) of the second trigger 5 enters short-.

cue impulse, duration g (figg).

Thus, at the first input of the second element I 10 there is a sequence of pulses (fig. 2a), and at the second input there is a pulse from the output of shaper 1, the duration of which is longer than the length of the pause in the sequence at the first input. At the same time, at the output of the element 10, an impulse that is reliably distinguishable in amplitude and duration (Fig. 2e) appears, according to the positive differential of which the driver of 3 pulses is triggered and forms a pulse (Fig. 2, duration

which passed the first element AND 9, opened by a high level from the output of the second trigger 5, is fed to the input of the register entry 12. The trigger 5 is dropped by the falling edge from the third generator 3 (FIG.), which is fed to the T input (second input a) trigger 5. This eliminates any rewriting of the counter code in the register before the next registration pulse arrives at the device input 14. Dp reliable operation of the trigger is necessary to

 WITH,

(four)

 -U2,

In addition, as can be seen from the timing diagram, the condition t (T / 2 -tj) + L must be met. (5) The stronger this inequality, the negative pulse difference (Fig 2, in which fy the counter code 11 is written to the register 12, is more spaced in time with the code change moment in the counter.

Claims (1)

The timing diagram also shows that the arrival of the registration pulse to the device input 14 at any other time after the time tj (for example, the diagram, dotted line in Fig. 2c) will cause the time diagram to shift to the right (Fig.2g, E, e , 5), and in this case, the pulse shaper 3 generates a write pulse to the register 12 (Fig. 2e1c, dashed line) at time tj. Thus, writing to the register is made in any case only at the time of the established code value at the outputs of the counter. Invention Formula A device for registering a current time code containing the first and second triggers, first and second elements And, a pulse generator, a counter and a register, the input of the first trigger is the first input of the device, the output of the second trigger is connected to the first input of the first element And, the outputs of the counter are connected to the information inputs of the register, characterized in that in order to increase the reliability of recording, the first to third pulse formers, the NOT element and the delay element, the inputs of the first and second pulse formers are introduced into it are the second input of the device, the outputs of the first and second pulse shapers are connected to the second input of the second element And the first input of the second trigger, respectively, the output of the first trigger is connected to the input of the pulse generator, the output of which is connected to the inputs of the counter and the element NOT, the output of which is through the delay element connected to the first input of the second element And connected via a third driver with the second inputs of the second trigger and the first element And, the output of the second trigger is connected to the first input of the first element And, the output of which is connected to the input of the permit register register. fuy. 7 Editor Y. Petrushke Compiled by A. Trunov Tehred L. Blaineik Order 388/54 Draw 673 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 fiyo 2 Proofreader S. Shekmar