SU790234A1 - Square-shape pulse reproducing device - Google Patents

Description

one

The invention relates to radio engineering and can be used in devices for transmitting signals over wired lines of communication over long distances.

A multichannel device for delaying and reproducing rectangular pulses is known, which contains an element AND, one input of which is connected to the input of the device, another input - to the output of a pulse generator and the input of another element I. The output of the first element AND is connected to a pulse counter, zero outputs of which each digit connected to the inputs of the group of elements I. Between the input of the device and the second inputs of the group of elements AND are connected in series the elements NOT, the element OR, and the one-shot. The outputs of the group of elements And connected to the inputs of another pulse counter. The outputs of the front delay elements are connected to the first inputs of the elements of Memory, and the output of another pulse counter to the second inputs of the elements of Memory, the output of which is the output of the device l.

However, the known device does not allow to recover the received

distorted signal to nominal duration.

It is also known a device for reproducing rectangular pulses containing a control triger, the single input of which is connected to the input of the device, the input of the element NOT AND the input of the element AND, the output to the input of the generator, the output of which is connected to the input of the counter i-puls, the outputs of which are connected to the inputs of the decoder , one group of outputs of which is through the OR element, the AND element is connected to the input of the rear edge former consisting of the second pulse counter, the second decoder and the block com (-1y tation, the output of which is connected to the inputs of the reset of the control trigger, the first and second pulse counters and the memory trigger, the single input of which is connected to

the output of the first decoder, and the output with the output of the device 2.

However, the start-stop generators used in this device do not have high accuracy and frequency stability, therefore, when playing long-time sigmals, the known device does not provide the necessary accuracy.

The closest to the proposed device for reproducing rectangular pulses contains inhibition elements and front and rear edge drivers, whose inputs are connected to the input bus, and the last output of which is connected to the second inhibition element through the delay element, the output of which is connected to the first input through the pulse driver. the first element And, the second element And, the first input of which is connected to the output of the reference pulse generator, the second input - to the output of the trigger, the first input of which is connected to the output shaper leading edge, a second input to I-counting trigger input, and an output - to a second input of the second AND gate.

A disadvantage of the known device is that it does not allow the output signal to be restored to its nominal value.

The purpose of the invention is to expand the functionality.

To achieve this goal, a device containing a generator, a delay element, a falling front driver, two elements AND, the first input of which is connected to the output of the first trigger, a second trigger, a period extraction unit, a strobe release unit, a frequency correction unit, a control unit . analyzer, time detection unit, additional elements I, the first inputs of which are connected to the input bus, and a strobe driver, whose inputs are connected to the outputs of the delay element, and outputs through additional I elements to the inputs of the time detection unit, the first output of which is connected to the first the input of the rear-front driver, the second output to the first inputs of the period selection unit, the gate selection unit, the analyzer, the control unit and the first trigger, and the third outputs to the second inputs of the analyzer and the selection unit the third input is connected to the first output of the analyzer and the second input of the period selection unit, the fourth input to the second output of the analyzer and the third input of the period selection unit, the input to the output of the frequency correction unit, and the output to the first input of the second element AND whose second input is connected to the output of a period selection unit, the fourth input of which is connected to the generator output, the input of the delay element and the second input of the control unit, and the fifth input to the first control unit, the third input of which is connected to tert to eat analyzer, the fourth input to the first input of the frequency correction unit, the first input of the second trigger, the second input of the first trigger and the output of the trailing edge, and the second output to the second input of the frequency correction unit, and the second input J of the trailing edge imager is connected to one of the driver's outputs strobe, and the third input - with the output of the second element And the second input of the first element And, the output of which is connected to the second input of the second trigger,

FIG. 1 shows an electrical functional diagram of a rectangular pulse reproducing apparatus; in fig. 2 is an example of a specific embodiment of the device; in fig. 3 - time diagrams that show his work.

A device for reproducing rectangular pulses contains a generator 1, for example, a crystal oscillator, the output of which is connected via an element 2 of a delay to the inputs of a generator-3 gates, the outputs of which are And 4 elements connected to an input

25 by bus, connected to block 5 for determining the arrival time of the input signal, the outputs of which are connected to the inputs of the frequency multiplicity analyzer.

The inputs of the control unit 7 are connected to the outputs of the generator 1,, the analyzer 6 and the output 9 of the unit 5 for determining time, and the output is connected to the input of the unit 8 for frequency correction. The inputs of the strobe allocation unit 9 are connected to the outputs of the time determining unit 5, and the control inputs are connected to the outputs of the analyzer b and the frequency correction unit 8. The inputs of the period selection unit 10 are connected to the outputs of the generator 1, the time determining unit 5, the analyzer b and the control unit 7. The outputs of the strobe allocation unit 9 and the period selection 10 through element 11 are connected to the entrance of the trailing edge generator 12, the other inputs of which are connected to the outputs of the generator 3 of the gate and the time determining unit 5, and the output to the first input of the trigger 13, the second input of which is connected to the output O - block 5 determine the time, and the output through the element And 14, the first input of which is soy, is dinane with the output of the element 11, to the first input of the trigger 15, the second input of which and one of the inputs of the control unit 7 and the frequency correction unit 8 are connected exit form Rovatel 12 back front.

The time determining unit 5 is designed to determine the number of the front-edge arrival gate and form control signals for the front and rear edges of the input signal and consists of a register 16. and a decoder 17 (Fig. 2).

Frequency analyzer 6 is designed to determine the frequency multiplier of the frequency generator 1 of the input signal, generates signals of frequency multiplicity, advance or delay of the frequency and consists of registers 18, 19 and a decoder 20.,

Frequency correction block 8 is designed to generate a frequency correction signal and consists of pulse counters 21 and 22, a register 23, a full match block 24.

The strobe execution unit 9 is intended to isolate the leading edge strobe in the period of the generator 1 and consists of a register 25 and a switching unit 26.

The period extracting unit 10 is designed to allocate the period of the generator 1 to form a leading edge of the output signal and consists of registers 27, 28 and a full match unit 29.

Shaper 12 trailing edge consists of a trigger 30, the element And 31, the counter 32 pulses, the element And 33, the element 35 of the delay per clock, triggers 34 and 36 and the block 37 switching.

The device works as follows

The signal of generator 1 (Fig. 3a) is fed to element 2 of delay, the total delay of which is half the period of generator 1, whose frequency is chosen to be a multiple of the generator frequency of the input signal, but not less than 4 times higher than it, shifted from a series of frequencies with equidistant outputs the delay element 2 arrives at the inputs of the gateway generator 3, which forms, within each of the half-waves of the generator, 1 p gates (Fig. 3B), interrogating the And 4 elements of the input signal with such a gas, that a signal is generated at the output of the And 4 j -th signal and writes down from 1 to the corresponding trigger of register 16 of block 5 for determining time, if the input signal overlaps the j-th gate in time.

The decoder 17 of this block will decrypt the state of register 16 according to the following algorithm: if the j-th trigger of register 16 is in state 1 a (j -) - in state O, then the j-th output of the decoder 17 forms the potential for finding the leading front input signal under the j-th gate; if the i-th register trigger 16 is in the O state, and (i-1) th state is in the 1 state, then the decoder of the 17 (+1) -th strobe generates a trailing edge signal. For example, the input signal (Fig. 3 d) is the trailing edge signal (Fig. 3 and), or the input signal (Fig. 3L) is the trailing edge signal (Fig. 3 m), where i and j are the number one

from the triggers of the register in question and the corresponding decoder output. The decoder 17 generates a pulse of recording the time code of the leading edge of the input signal in the next half-period of the generator 1 after the arrival of the leading edge of the input signal (Fig. WE). This signal is used to record the time code of the leading edge in the register 25 of the strobe allocation unit 9 and in the register

O 18 of the frequency analyzer 6, the previous time code value from register 18 is rewritten into register 19 of the same block, by comparing the arrival time values

5 of the leading edge of the input signal determines the frequency accuracy of the generator 1 forming the frequency of the input signal, which always occurs due to the variation in the parameters of the generator 1.

0

The decoder 20 of the analyzer 6 decrypts the state of registers 18 and 19 according to the following algorithm: if the i-th trigger of register 19 is in the state O, and the (i-1) -th state

5 1 and the i-th trigger of register 18 is in state 1, then the frequency advance potential is formed; if the i-th trigger of register 19 is in state 1, and (i-1) -th in state

0 O and (-1) th register 18 trigger in state 1, then a frequency lag potential is generated; decoder output potentials 20 advance and frequency lag

5 are set to the inputs of the register 25 of the allocation unit 9 of the gate and the register 27 of the period selection unit 10 and control the direction of the information shift in these reversible shift registers. In addition to the above signals, the decoder 20 generates a non-frequency signal, if the contents of the registers 18 and 19 are not equal, according to which the control unit 17 stops supplying the frequency of generator 1 to the counting input

five . the counter 21 of the frequency correction block 8, rewrites the contents of the counter 21 IB register 23, resets the counter 21 and reopens the oscillator 1 frequency to its counting input.

0 Thus, on the register 23, the binary code of the number of periods of the generator 1 between the two instants of the leading edge of the input signal from one gate of the Form5 of the gateway 3 gate to the other is memorized. Frequency correction counter 22 8 is the number of periods of oscillator 1 for the input signal, counter code 22 is constantly compared with the contents of the register

Claims (3)

1. Authors. USSR certificate № 482882, cl. H 03 K 5/20, 1973. 2. USSR author's certificate according to application no. 2516128, cl. H 03 K 5/20, 1977. 3. USSR author's certificate h 540365, cl. H 03 K 5/18, 1975.