SU1385276A1 - Advance timing signal driver - Google Patents

Abstract

The invention relates to a pulse technique and can be used to synchronize visualization devices using a spatial selection method for observing objects and objects in a turbid atmosphere, for example, in a fog. The invention allows to increase the reliability of the shaper operation. For- the world clock master clock contains trigger 1, lane 2, and

Description

10, elements OF, 5, 14 and 15, counters 4 and 6, elements OR 7.9 and 12, one-shot 8 and 11, the generator 13 pulses. In the transition period, the proposed shaper produces only one sync pulse with a set advance time B

76

As a result, the shaper's operation is characterized by high reliability with an abrupt change in the part of the sequence of pulses of the sync signal. The operation of the former is illustrated by the timing diagrams in the description of the invention 2 or 3

one

The invention relates to a pulse technique and can be used to synchronize visualization devices using the spatial selection method (MPS) for observing objects and objects in a turbid atmosphere, such as a fog.

The purpose of the invention is to increase the reliability of work.

- FIG. 1 shows an electrical block diagram of the device; FIG. 2 shows timing diagrams of the device operation.

The forward sync driver contains a trigger 1, the counting input of which is connected to the input bus-2, the direct output is connected to the first input of the first element I 3 and to the fold input of the first counter 4, the inverse output of the trigger 1 5 and the input of the complication of the second counter 6, the subtractive input of which is connected q by the output of the first element IZ, the outputs through the first element OR 7 and the first one-vibrator 8 connected in series to the first input BTopqro of element ШШ 9, the output of the second element I 5 is connected to the input of the first counter 4, the output of the second element OR 9 is connected to the output bus 10, and the second input is connected through the second single-vibrator 11 and the third element OR 12 - in series with the outputs of the first counter 4, the counting inputs of the first 4 and second 6 the counters are connected to the output of the generator 13 pulses, the third 14 and the fourth 15 elements And, the outputs of which are connected to the installation inputs, respectively, of the first 4 and second 6 counters, the first inputs 5

ABOUT

0 5 0

to the input bus 2, the second inputs to the inverse and direct outputs of the trigger 1, respectively, and the second inputs of the first 3 and second 5 And elements are connected respectively to the output of the first element OR 7 and the output of the third element ШШ 12.

The algorithm of functioning of the former consists in the formation of a sequence of pulses on the output bus 10 (Fig. 2.h), which repeats in shape and at the same time ahead of time, the interval of which is equal to tp arriving at its input bus 2 (Fig, 26) the input pulse sequence (VIL) constant frequency. An abrupt change in this frequency places the driver in the mode during which the automatic transition to the initial functioning algorithm occurs,

To clarify the process of operation of the imaging unit, the diagram (Fig. 2) shows the sections with different HS-1 period: the time interval between the first and fourth, fourth and eighth, eighth and eleventh pulses corresponds to a constant period (Fig. 2a). In the time intervals between the fourth and fifth pulses, an abrupt decrease occurs, and between the eighth and ninth pulses, a corresponding increase in the VIL period (Fig. 26).

Shaper works as follows

VIL pulses of a constant frequency come from the input bus 2 to the counting input of the trigger 1 (Fig. 26), alternately its state and the potentials of its direct (Fig. 2c) and inverse (Fig. 2d) outputs. Potentials

 Manage the operation mode of two reversible counters 4 and 6, for counting

The input of which the counting pulses of the generator 13 arrive. This control in the former is arranged so that the operating modes of the counters are shifted by one VIL period (figo 2d, and), when one counter is in Addition mode, that other counter is in it. time is - is in subtraction or stop modes.

In order to form one sync pulse, leading the corresponding impulse of the VIN, a cyclic sequence of two operation modes of counters 4 and 6 is used in the shaper: Addition and then Subtraction. In the last mode of operation, a sync pulse is generated, which is ahead by time t every second VILO pulses. This sync pulse appears at the output of that one-oscillator 8 and 11, which is connected to counter 4 or 6, operating in the Subtraction mode, Owing to The shift of the operation modes of the counters 4 and-6 at the output of the single vibrators 11 and 8 (Fig. 2h and 2 m) are alternately formed with a "frequency twice as low as the frequency of the VIN, sync pulses, which are combined in the OR 9 element and arrive at the output bus. 10 as a sequence and pulses (Fig. 2n), coinciding in shape with the VIN and advancing each of its impulses by the time to Linima, taking into account the cyclical nature of the counters 4 and 6, iodine description of the shaper operation is carried out on a time interval containing two periods of VIN, for example, between the second and the fourth pulse for the control circuit of the operating mode of the counter 6 and between the first and third pulses of the VIL for the corresponding circuit of the counter 4 (Fig. 2a).

The control circuit of the counter. ka 6 contains two elements And 3 and 15 and works as follows. Assume that at the moment of arrival of the second impulse VIL counter 6 is in the stop state (Fig. 2e), which corresponds to the value of low

 potential O at inputs C (addition and B (subtraction) of counter 6. Since input C of this counter is directly connected to the inverse of the trigger

0

five

Q

0

five

0

five

0

five

Step 1, the direct output of the trigger 1 is a high potential 1 pbd, (Fig. 2c), which is fed to the first input of the And 3 element and the second input of the And 15 element. The high potential of the second VIL impulse during the appearance of the first input of the And 15 element and, accordingly, at the input V (installation) of the counter 6 (FIG. 2e), the bits of this counter are zeroed. Condition condition Stop of counter 6 at input B in this case is carried out by the low potential of the output of the element OR 7 (Fig. 2g), which, arriving at the input of the element I 3, appears at the entrance of the counter 6 o

The cycle of operation of the control circuit of counter 6 begins at the moment of termination of the action of the second CFI pulse (Fig. 26), in which the condition of Trigger 1 changes to the opposite, since a push-pull trigger with a counting input, for example, T-type B, is used as a trigger element. this moment of time on the forward and inverse outputs of flip-flop 1 appears, respectively, low (Fig. 2c) and high (Fig. 2d) potentials, the first of which prevents the third VIL pulse from passing to input Y of counter 6 and high potential from the output of the element AND LI 7 is at the input B of this counter, and the second potential transfers the counter 6 to the Addition mode (Fig. 2e). This mode continues until the next third pulse (Fig. 2a) returns trigger 1 to the initial state (Fig. 2c, d). In this case, the counter 6 stops and the next moment goes into the Subtraction mode (Fig. 2e), since the high potential of the direct output of the trigger 1 (Fig. 2b) allows passage 1 from the output of the element OR 7 (Fig. 2g) to the input B through element E 3. In this mode of operation of the counter 6, a sync pulse is formed, which is ahead of the next fourth impulse of the TIP (Figo 26, h) o. The formation of the sync pulse is determined by the mechanism of interaction of the counter 6, the OR element 7 and the 8 e. of the fourth impulse during the former, all bits of counter 6 are reset to zero, because the potential of the VIL impulse is high. goes through

the first input of the element 15 to the input of the counter 6 (fig. 2e), since the direct output of the trigger 1 and, therefore, the second input of this element 15 has a high potential (fig. 2b). At the moment of ending of the action of the fourth impulse of the VIN, a new cycle of the operation of the counter 6 begins, in which the sequence of operations of the cycle and the corresponding states of the elements included in the control circuit of the counter 6, is repeated again,

The formation of a sync pulse, which is produced in the operation mode Subtraction of the counter 6, is determined by the mechanism of joint operation of this; the counter 6, the element OR 7, and the single-vibrator 8. The work is considered under conditions taken for definiteness: the counter 6 is binary, and the one-shot 8 produces pulses only in the case of a drop at its input potential from the upper to the low level. the output of the least significant number of the higher bits of the counter 6 connected to the inputs of the element OR. 7 appears 1. As a result, the output of the element OR7. a high potential also occurs (Fig. 2g). Subsequently, the Addition mode leads to an increase in the value of the logical number at the outputs of the bits of counter 6. Notice that the high output potential of the element OR 7 does not change. Considering the logic of work. one-shot 8, a change in potential at the output of the element OR 7 at time t (Fig. 2g) does not result in a pulse in the code of the single-oscillator 8 (Fig. 2h). In the following mode, Vyagitaniye, which starts after the appearance of the third VIL pulse, there is a gradual decrease in the value of the logical number in the bits of the counter 6o. As a result, after a certain period of time, all older bits of the counter are zeroed, the potential at the output of the element OR 7 changes from high to low, Rathore 8 and the occurrence of the sync pulse at its output which leads to the arrival time t 2 to the input bus of the pulse shaper fourth VCSEL (FIG about 2h). At the time of formation of the clock pulse, the counter 6 stops (Fig. 2e),

since the low potential at the output of the element OR 7 (Fig. 2g), through the second input of the element 3, arrives at the input B of the counter 6. At the end of the cycle of operation of the control circuit of the counter 6, in the lower bits of this register, the remainder of the logical number is formed, the value of which is connected over time, to the following formula:

2G.T

SC1

Q

P 5 5

0

where ga is the number of low order bits from h

counter 6 T. tc - the period following the counting

impulse

In this case, the total number of bits n of the counter, equal to the sum of the number of low and high bits, is determined depending on the maximum possible value of the period of the VIP over the expression

n log (VdKc / Tcv).

; The operation of the control circuit of the counter 4 and the formation of a sync pulse at the output of the single vibrator 11 is similar to the operation of the control circuit of the counter 6 and the generated sync pulse at the output of the single vibrator 8, since the operation of these circuits is almost the same and only shifted in time by one VIP period (Fig. 2g, m) about

Thus, when a clock signal arrives at the input bus 2, which is a constant frequency VIP, its output bus is formed ahead of time to each pulse of the VIP, a sequence of sync pulses. or forward sync

The operation of the driver in the transient mode, arising from a jump-like change in the frequency of the VIP, is characterized by the existence of four types of combinations of the sign of the change in the period of the VIP and the operation mode of counters 4 and 6 at the time of this change; a decrease and an increase in the period during the operation of the addition of the counter 6; a decrease and an increase in the period during the operation mode Subtraction counter 4 „

To describe the behavior of bodies in the transition period, the diagram shows all four types

combinations. At the same time, the decrease in the period is associated with the appearance of the fifth pulse, and the increase in the period corresponds to the appearance of the ninth pulse (Fig. 26),

The shaper operation associated with the operation of counter 6 occurs without any errors in sync pulse generation with an advance time equal to to, because by the time the fifth or ninth VIL pulses appear, due to the addition mode, counter 6 remembers the logical number , equal to the new value of the period VIL.

The operation of the driver, associated with the operation of the counter 4, which functions until the fifth and the ninth AVI pulses appear in the Subtract mode, occurs with the formation of a sync pulse with a zero lead time with respect to the first. a pulse with a decrease in the period of the VIP and with a lead time tp greater in value than the time t with respect to the ninth pulse with an increase in the period of the VIP (FIG. 2m).

At the end of the transient cycle, which lasts only for one period of the new value of the VIP frequency, the driver works without any errors in the formation of clock pulses with a time tc.

Thus, in the transition period, the generator is abutive only one sync pulse with a lead time not equal to t ,,, As a result, the operation of the driver is characterized by greater reliability with an abrupt change in often

five

Q

five

Claims (1)

You follow the clock pulses. Invention Formula A forward sync driver that contains a trigger, the counting input of which is connected to the input bus, the forward trigger output is connected to the first input of the first element I and to the folding input of the first counter, the inverse output of the trigger and the folding input of the second counter, subtracting the input of which is connected to the output of the first element AND, the outputs through the first OR element connected in series and the first one-shot are connected to the first input of the second element OR, the output of the second element connected to the subtracting input of the first counter, the output of the second element OR is connected to the output bus, and the second input is connected through the second single-vibrator and the third element OR to the outputs of the first counter, the counting inputs of the first and second counters are connected to the output of the pulse generator, characterized in that In order to increase the reliability of operation, the third and fourth elements of AND are entered into it, the outputs of which are connected to the installation inputs of the first and second counters, respectively, the first inputs to the input bus and watts rye inputs respectively - to forward and inverse outputs of the flip-flop, the second inputs of the first and second AND gates connected respectively to the output of the first OR gate and with the output of a third OR gate. Fi & 2