SU415812A1 - - Google Patents

Description

one

The present invention relates to telegraph measuring devices, in particular to measuring devices for the marginal distortion of telegraph packages.

Devices for measuring edge distortions are known which provide an estimate of either the current values of the distortions or their maximum values over a certain measurement time. Such gauges include a device for measuring maximum edge distortion of telegraph signals.

The known device contains a start-up distributor with a block of coincidence circuits that mark the instants of the occurrence of actual characteristic recovery points (DCMB) and using the maximum distortion fixation block performed on the triggers with the appropriate connections through logic elements, indicates the maximum distortion values for any given interval time until reset.

The specified device allows to measure the magnitude of the magnitude of random values of distortion and to estimate with a certain degree of accuracy the standard deviation of distortion.

However, the known device has a significant drawback, which is the impossibility of determining the value

and the sign of the dominant (mathematical expectation) edge distortion, which significantly affects the accuracy of recording telegraphic packages. The continuous prevalence leads to a sharp increase in the likelihood of incorrectly registering the parcels, deteriorating the quality of received sigals, reducing the reliability of the transmitted information. The integers of the invention increase the accuracy of the estimated.

The goal is achieved by additionally introducing a cascade for determining the sign of the phase mismatch, the cascade of changing the phase of the pulses and the divider, and the input

the divider is connected via a cascade of phase change of the pulses to the output of the source of the start-stop pulses, and the outputs of the divider are connected to the inputs of the distributor and the cascade determining the sign of the phase mismatch, the second input

which is connected to the output of the input telegraph relay, and the output - to the input of the cascade of change of the phase impulses.

The drawing shows the block diagram of the proposed device, where the following are taken

designations:

I-source from

artstoppouravrav smykh tkopoplobyuschenh given stabilized pulses. ness and frequency of following. Can be executed in ;; idg 5:;: sokostamply, continuously

a working generator with an electronic key output controlled by starting and stopping parcels;

2 - input telegraph relay, used to match the meter with the line;

3- an element for determining the sign of the mismatch of the phase (polarity) of incoming parcels, for example, the phase discriminator used in the phase correction circuits of the synchropic systems;

4 is a circuit for changing (correcting) the phase of the pulses following from the outputs of divider 6, executed, for example, as elements for adding and subtracting pulses from generator 1 to divider 6. The phase changing circuit may contain averaging elements such as reversible counters, reversible registers, and accumulators etc.;

5- a count of the number of parcels in the start-stop cycle with a divider ensuring the reduction of the frequency of control pulses arriving at the input of the counter;

6- divider used to change the phase of recovery moments (MB) depending on the sign of the phase mismatch between the incoming DHMB parcels and the MB instrument circuit formed using circuit 4

and creating a discrete time scale to estimate the magnitude of the predominance (expectation) of the edge distortion;

7- unit indicating the magnitude of the predominance (mathematical expectation) of marginal distortion of the parcels, which can be performed either as a series of discrete indicators (incandescent bulbs, neon bulbs, LEDs, etc.) with triggers, or as a decimal indicator with a corresponding code generator etc., which can be changed using signals from the batch counter 5, either after each batch or at the end of the start-stop cycle;

8 - a distributor with coincidence schemes that creates a discrete time scale, which serves to measure the current and maximum values of distortion with respect to the expectation measured by the divisor 6;

9- block indication and fixation of both current and maximum values of distortion

for a certain measurement time.

The operation of the proposed device in the measurement mode of the expectation of distortion occurs as follows.

At the moment of switching on the device, the measurements are installed, the blocks and circuit elements are reset. The elements of the installation of the circuit in the initial state are not shown in the drawing.

With the arrival of the starting transition, the start-to-controlled source of pulses 1 is turned on, and the pulses with a given frequency determined by the wiring speed and the dividing price of the scals start to arrive at the input of the count of parcels 5 in the star-stop cycle 5: m through the change circuit

phase 4 to the input of the divider 6. At this time, the phase of the pulses on the outputs of the divider 6 corresponds to the absence of predominance (i.e., the predominance is 0).

The divider 6 removes control signals to the error sign definition element in such a way that when the DHMB receives code messages ahead of the phase (negative distortion sign), element 3 appears at the output of element 3, displacing the phase of the pulses from the output of the divider 6 side of advance by a certain amount (adjustment step). If the DCMV code message arrives with a phase lag (positive sign of distortion), then elements 3, 4 correct the phase of the signals coming from the outputs of divider 6 towards the lagging side. Thus, the phase of the signals at the output of the divider 6 is shifted by a certain amount similar to the operation of the correction device of the synchronous system. After receiving the DHMB corresponding to the code combination, the signal from the output of counter 5 at the time of the stop burst turns off the source of pulses 1 and transfers the circuit 5 to its original position, i.e., it records (remembers) the phase of the signals (the magnitude and sign of prevalences) that were determined during the measurement time of a single code combination. The signal from the output of the counter 5 transfers the number recorded on the divider 6 to the display unit 7, and this value will remain until the end of the next start-stop cycle. With the arrival of the next starting transition, the source of pulses 1 is turned on, and the circuit operation cycle repeats. During several hundreds of cycles, the phase of the pulses of the divider 6 is measured more accurately, the magnitude of which is measured with respect to the beginning of the incoming starting bursts by determining the location of the pulse in divider 6 with respect to the initial state of this pulse at the beginning of the measurements. Using the display unit 7, both the sign and the magnitude of the predominance are displayed. Along with a change in the phase of the signals following the output of the divider 6, the offset and the bullet value of the reference scale of the current and maximum distortion values of the code parcels are shifted due to the fact that the phase of the pulses entering the distributor 8 is shifted, as the clock pulses at the distributor input 8 comes from the output of divider 6. Therefore, the proposed device measures the expectation of distortion and the maximum value of distortion relative to their mathematical value.

Thus, a simultaneous assessment is made of the magnitude of the predominance and range of the edge distortions relative to the predominance.

For separate measurement of current and current-free shipments, it is necessary from the output of the input device to the input of element 3 to submit either the DHMB TOKOiBbix package or the DCMV current package.

Subject invention

A device for measuring time distortions of telegraph signals, containing a source of start-stop pulses, to the control input of which an input telegraph relay is connected, and to the output - a counter of the number of pulses in the start-stop cycle, a distributor with a display unit of the magnitude of distortions, characterized in that, in order to improve accuracy estimates, a cascade of determining the phase mismatch sign, a cascade of changing the phase of the pulses and a divider are additionally introduced, the divider input being connected through a cascade of changing the phase of the pulses to you Odom source of start-stop pulses and divider outputs - to the inputs

the distributor and the cascade determine the sign of the phase mismatch, the second input of which is connected to the output of the input telegraph relay, and the output - to the input of the cascade of changing the phase of the pulses.