SU1622926A2 - Shaper of time intervals - Google Patents

Abstract

The invention can be used in systems of discrete signal processing. devices automation and computing. The aim of the invention is to improve the accuracy of the formation of time intervals by reducing the sampling step of the formation. The time interval former contains 1 pulse generator, 2, 5 pulse generators, frequency dividers 3, 1, 4, 8 keys, OR 6 element. EXCLUSIVE OR 9, 10 elements are inserted into the time interval former. Control signals are supplied to the second inputs. 1 il.

Description

hpsci

c

Sfe

YY

EH

I

Reset

Esh gj

ABOUT

Yu Yu Yu Yu O

Yu

The invention relates to a pulse technique, can be used in automation and computing devices and is an improvement of the device according to the author. No. 1277366.

The aim of the invention is to improve the accuracy of the formation of time intervals by reducing the sampling step of the formation.

The drawing shows the functional diagram of the shaper time intervals.

The time interval shaper contains serially connected pulse shaper 1, the first pulse generator 2, the first frequency divider 3, the first key 4, the second pulse generator 5, the element OR 6, the second divider

7 frequencies, the second key 8, as well as elements EXCLUSIVE OR 9 and 10, whose inputs are connected to the inputs of generators 2 and 5, and the outputs, respectively, to the inputs of keys 4 and 8. The outputs of keys 4 and 8 are connected to the reset inputs of generators 2 and 5 and the resolution inputs of the dividers counts 3 and 7.

The device works as follows.

The trigger signal through driver 1 starts generator 2. This corresponds to the beginning of the interval being formed.

The generator 2 produces a series of pulses with a period ti and the number of pulses equal to the division factor of divider 3.

8, depending on the division factor of divider 3, the first part of the formed time interval is determined. The introduced element 9 EXCLUSIVE OR allows to add to the integer number of periods of the generator 2 a time interval equal to half the period of the generator 2. This occurs as follows. Depending on which control level (Log, 0 or Log. 1) is fed to the second input of the EXCLUSIVE OR element, it does not invert or invert the pulses received at the first input from the generator 2. To the control input of the element 9 in this case level log. 1, and it inverts the pulses from generator 2. When a pulse from the output of divider 3 appears at the input of the switch 3, a single pulse is selected from the inverted sequence at the output of element 9, and a pulse is generated at the output of key 4, on the front of which the generator 5 is started, and by decay, the stop of the generator 2 and the setting of the initial division factor of the divider 3. Since the selection of a single pulse is carried out

from the inverted sequence, the pulse front at the output of the key 4 coincides with the pulse drop from the generator 2, i.e. shifted by half a period. Generator7 2

forms a sequence of pulses with a duty cycle of 2 type square wave,

Thus, to the integer number of periods of the generator 2. formed by the divider 3. add half of the period and the time interval formed by the divider 3. Divider 3 is constructed so that at the level of Log. 1 at the input of the resolution of the account it is in the mode of stopping the account and storing information on the counted number of pulses, and on the voltage drop from the log. 1 in the log. O, the initial division factor is established. A short impulse arises with this joint: on the exhaust of the generator 2 due to the finite speed of the elements

device, and its duration is equal to the delay time in divider 3 and key 4. This pulse is not registered either by divider 3, since it is in the information storage mode, or by counter 7, because

this time is not present at the other inputs of the element OR 6, the pulses from the generator 5 and D, n - 3, and all these pulses are perceived by the counter as a single pulse, so kchk. The last pulse from the generator 2, which starts the generator 5, and the first pulse from generator 5, they coincide in time and are combined by the element OR 6 as one pulse.

Thus, the communication is functional.

between / output divider 3 vi the third input of the element IL AND 6 is introduced in order to block the passage of a short pulse from the output of the generator 2 to the input of the divider 7.

Since the termination of the generator 2 generation occurs at the moment of time corresponding to the falling edge at the output of the key 4, then regardless of the delay time in the divider 3 and the key 4 at the output of the key

4, a pulse of standard duration is formed to start the generator 5, which ensures the correct operation of the device.

A series of pulses from generator 5 with period G2 and the number of pulses equal to the division factor of divider 7 at the time of generator 5 start is fed to the input of the element OR 6 and then to the input of frequency divider 7, the division factor of which

decreased by the value of the division factor of divider 3. To the control input of element 10 EXCLUSIVE OR, the level Log is applied. About and at the output of the argument 10 will be present neinvertirovanne

the impulse of the generator 5, and, consequently, another half of the period is not added to the integer number of periods of the generator 5,

When a pulse appears at the input of the key 8 from the output of the divider 7, a pulse is selected from the non-inverted sequence at the output of element 10, and at the output of the key 8 a pulse appears, at the front of which the formation of the boiling time interval ends, and after the decay generator 5 and setting the initial division factor of divider 7.

The value of the time interval formed by the device is

T nir, + (p -l t-) r2 + A, y- + A2,

where um, n are the division factors of the dividers Zi7;

r, t2 are periods of generators 2 and 5;

Ai, AZ - coefficients equal to zero or one, depending on which control level is located at the inputs of the EXCLUSIVE OR 9 and Y elements.

We put ri G2 + Dg, where Dg is the difference between the periods of the reference generators 2 and 5, then

T ni Dg + gtg2 + A

(r2 + dg)

V7

4-A, (D

From formula (1) it can be seen that the minimum time interval formed in this generator is equal to half the period of the reference generator, i.e. the discretization step of forming small time intervals (units of periods of reference generators) is half the period of the reference generator, and the step of forming long

time intervals in this generator of L. g / 2. This is achieved if the coefficients Ai and A2 in formula (1) are chosen to be equal to unity AI A2 1, which corresponds to the control levels Log. 1 at the inputs of elements 9 and 10.

Thus, an increase in the accuracy of the formation of time intervals in this generator is achieved by reducing the step of discretization of the formation in the entire range of intervals formed.

Claims (1)

Invention Formulation Time Shaper on auth. No. 1277366, characterized in that, in order to increase the accuracy of the formation of time intervals, the first and second elements EXCLUSIVE OR are introduced into it, the first inputs of which connected to the outputs of the first and second pulse generators, the second inputs of the EXCLUSIVE OR elements are connected to the control signal buses, and the outputs are connected to the second the inputs of the first and second keys, respectively, the outputs of the keys are connected to the counting inputs of the first and second frequency dividers, respectively, and the output of the first frequency divider is connected to the third input of the OR element.