SU756620A1 - Device for variable time delay - Google Patents

Description

The invention relates to a pulse ^- * ^- ! instrumentation technology and can be used in automated information and control systems for various purposes.

Various time delay devices are known that implement both analog and discrete methods for delaying pulse signals. But in- (the most complete satisfaction of the requirements of hardware unification and standardization, as well as obtaining increased accuracy and reliability of measurement information, the use of digital devices for time delay is more preferable in many practical cases.

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Known digital delay devices based on time-scale conversion, containing clock generators, controlled frequency dividers, Gates blocks, and key elements that, when compared with the operating and control counters, allow for resetting the scale factor of the delay time interval produced by a.

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a control action received either independently of the parameters of the input signal sequence — from measurement data of repeated re-tests, or by changing the number of connected elements of a fixed delay (trigger cells), depending on the number of incoming clock pulses. As those, and others, as a rule, work without saving at the output of the original duration of the input signals. These devices can be used to solve various problems with the use of controlled delay, produced in dynamic modes [1 (].

However, due to the lack of possibility of generating a control action associated with the informative parameter of the input signals, they are not very suitable for generating an adjustable delay functionally determined by the duration of the input signals while maintaining their output duration at the output. This disadvantage does not allow the use of these devices for temporal ordering of a sequence of signals of random duration in adaptive systems.

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collection and transmission of information, working in real time.

It is known a variable time delay device comprising a sampler, sampling pulse generator, control keys, ³ input signal duration counter, a duration code storage register, a first zero detector, a shaping trigger, which allows for variable input signal delay maintaining the output of their original duration [2].

Despite the constructive simplicity and the possibility of using the dynamic control of the delay-15 (with a single passage of the input signal sequence), its use for the formation of an adjustable delay functionally defined duration of 20

input, signals difficult. The latter is due to the fact that the range of variation of the delay is rigidly set by the duration of the input signal in such a way that the ratio of magnitude 25

delay to the signal duration is always equal to one. This disadvantage limits the functionality of the device and, thereby, narrows the scope of its use.

The aim of the invention is to extend the functionality by providing an adjustable delay depending on the duration of the input signal while maintaining their initial duration at the output. 35

This goal is achieved by the fact that the device variable, time delay, containing the driver of the readings', the control outputs of which are connected to the control inputs of the strobe generator, the first frequency output of which through the first control key is connected to the counting input of the counter duration of input signals and the second frequency output - with the input of the second control key, with the control. the inputs of the first control key, the first control input of the second

the control key and the control input of the input signal duration counter, the output of which is connected through the serially connected storage register of the duration code and the first zero detector connected to the first input of the formation trigger, the third one is entered. control key connected between the second frequency output gate pulse clock and the second input of the code storage register

duration, frequency divider and series-connected reversible result counter, result code storage register, second zero detector, the output of which is connected to the second formation trigger input,

the first control input of the third control key, the second control input of which is connected to the output of the first detector 'zero, and the second control input of the second control key, the output of which is connected to the second input of the result code storage register, while the input of the frequency divider and the first input of the reversible result counter are connected to the output of the first control key, and the output of the frequency divider to the second input of the reversible counter of the result, controlled by the reference value generator.

The operation of the proposed device is based on memorizing the code for the duration of the input signal and transferring its value by a variable delay value equal to the difference obtained by dynamically subtracting the duration code and the nap code! Edited setpoint, with subsequent restoration of the duration of the original signal obtained by reading the resulting code reference frequency.

FIG. 1 shows a block diagram of a variable time delay device; in fig. 2 - timing diagrams explaining the operation of the device.

The device of variable time delay contains the shaper 1 sample values, designed to generate signals corresponding to the beginning and end of each input analyzed interval? generator of 2 gating pulses, generating a stable frequency counting sequence} first control key 3; counter 4 of the duration of the input signals, which converts the duration of the time interval into the position code} reversible counter 5 of the result, which forms the code value of the variable delay; frequency divider 6, producing division of the counting sequence with a given coefficient; register 7 storage code duration, performing the function. memorizing the numerical value of the analyzed 'interval; register 8 storing the result code, performing the function of storing the numerical value of the variable delay; the second key 9 control; the second detector 10 zero foxying the end of the delay; trigger 11 formation; the third key 12 control; the first detector 13 zero, fixing the end of the delayed input signal; 14 and '15, respectively, the input and output devices.

The device variable time delay works as follows.

Upon receipt at the input 14 of the device input (Fig. 2a) binary sequence of signals of random duration shaper 1 count 5

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These values form the "Start" signals (Fig. 2b) of each input signal, corresponding to the temporal position of the leading and trailing edges. Signals "Start" from the output of the imaging unit 1 of the reference values are fed to the control inputs of the generator 2 gating pulses and the first key 3 controls. The generator 2 has two frequency outputs that generate the signals of the counting sequence (Fig. 2d) of gating pulses of a stable repetition rate. With the arrival of the starting signal, the first frequency output of the generator 2 opens and the counting sequence through the public key 3 of the control enters the inputs of the counter 4 of the duration of the input signals, the reversible counter 5 sets! ^ And the frequency divider 6, the output of which is connected to subtracting the input of the reversible counter 20 of the result. The frequency divider 6 has the installation inputs of the division factor. The incoming counting sequence (Fig. 2d) accumulates in the counter 4, the length of time is 25.

input signals and is converted into a binary unitary code. At the same time, the counting sequence, which is fed to the input of frequency divider 6, is divided with the coefficient of 30 points of a set scale, Chosen from a priori knowledge of the range of change of the analyzed intervals, and a frequency sequence is formed at the output (Fig. 2e), 35

the frequency of which is lower than the frequency of the counting sequence. From the output of the frequency divider b, the frequency sequence (Fig. 2d) of the pulses goes to the subtracting input of the reversible counter 5 of the result, to the summing input of which the counting sequence (fig.2g) of the gating pulses goes. The reversible counter 5 of the result works in the mode of continuous dynamic subtraction of two sequences of pulses of different repetition rates. And this state of operation of the device is maintained until the moment when the for- form is generated. 1 counting values of the signal "End". With the arrival of the "End" signal, the first frequency output of the strobe pulse generator 2 is turned off, the first control key 3 is closed, and in the counter 4 of the input signals duration and in the reversible counter of the result 5, the time interval code (Fig. 2g) and the code are recorded respectively result (Fig. 2e) values of the belt delay variable 6C. The same signal is used to rewrite the code values into the storage register 7 of the duration code connected to the output of the count 4, and to the storage register 8

the result code connected to the output of the reversible counter 5 of the result. The census information from the counter 4 and 5 is carried out with the cleansing of the latter, preparing them to receive and process subsequent signals.

The choice of the digit capacity of the counter 4, the duration of the input signals, the reversible counter of the result 5, the frequency divider 6 and the registers 7 and 8 is determined by obtaining the necessary accuracy of the time conversion, which is. Paradise depends on the choice of the frequency of the following gating pulses, and is determined from a priori knowledge of the time parameters of the input binary sequence of signals of maximum 'duration.

Simultaneously with the information census, the second frequency output of the strobe pulse generator 2 and the second control key 9 are opened, from the output of which the counting sequence is fed to the read input of the register 8 for storing the result code. The reading of the recorded number (Fig. 2e) is performed for a time equal to the value of the result code, and "continues until the second zero detector 10 connected to the output of the register 8 for the storage of the result code records its zero state. This time determines the interval of the produced pulse delay. At the moment of fixing the zero state of the register 8 of storage of the result code, the zero detector 10 generates a signal at the output that goes to one input of the formation trigger 11, closes the second control key 9 and opens third switch control 12, the output of which enters the counting sequence of strobe pulses from the second frequency output generator 2. Counting _sequence; telnost through the open third switch 12 is supplied to the control storage register 7 reads the input code length, which is connected to the output of the first detector 13 zero. The zero state of the register 7 of the storage of the durability code, fixed by the detector 13 zero, is accompanied by the generation at its output of a signal, which is fed to the second input of the formation trigger 13 and the entrance of the third key 12 control, closing the last. As a result of this interaction of the device nodes, at the output 15, an output binary sequence (Fig.2i) of signals is generated, the duration of which is equal to the duration of the input sequence (Fig.2 ^) of the signals, with a variable delay between them.

The variable delay (Fig. 2h) is determined by the total

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the value of constant and variable components. The constant component is determined by the duration of the input signal, and the variable component is determined by the difference obtained by subtracting the interval from the input signal, transformed by dividing the frequency of the strobe signals with a predetermined coefficient that falls within the interval of the input signal.

Thus, the proposed device, in contrast to the known, provides an adjustable variable delay depending on the duration of the input signal, while maintaining their original duration at the output, which, in turn, extends the functionality.

Claims (1)

Claim A variable time delay device containing a sampler, the control of which is connected to the control inputs of the strobe generator, the first frequency output of which through the first control key is connected to the counting input of the counter of input signals duration, and the second frequency output to the input of the second control key the inputs of the first control key, the first control input of the second control key and the control input of the input signal duration counter, the output to Secondly, the first zero detector is connected to the first input of the formation trigger via serially connected storage register, characterized in that, with the aim of extending the functionality while providing adjustable hold, depending on the duration of the input signal while maintaining their initial duration it entered the third control key connected between the second 10 frequency output generator of strobe pulses and a second input re giste storage duration code, frequency divider and the series-connected down counter result storage register code D ³ result, the second null detector, whose output is connected to the second input forming the trigger, the first yn equals input of the third key control, the second control input to 20 of which is connected to the output of the first zero detector, and the second control input of the second control key, the output of which is connected to the second input of the result code storage register, while the input of the frequency divider and the first input of the reversible result counter are connected to the output of the first control key, and the output frequency divider - to the second input 30 is a reversible result counter, the control input of which is connected to the output of the reference value generator.